JP6881158B2 - Manufacturing method of cable with protective tube and manufacturing system of cable with protective tube - Google Patents

Description

The present invention relates to a method for manufacturing a cable with a protective tube, a manufacturing system for a cable with a protective tube, a protective tube and a cable with a protective tube.

Since the cable laid on the bottom of the water may be damaged by obstacles on the bottom of the water, a plurality of protective tubes may be attached in a string along the cable so as to surround the outer circumference of the cable.

Conventionally, when a cable is laid in a water area having a depth that allows a diver to dive, the cable is laid on the bottom of the water in advance, and then a protective pipe is attached to the cable by the diving work of the diver.

On the other hand, when laying the cable in a water area where the diver cannot dive, or when it is necessary to attach the protective pipe to the cable over a long distance, attach the protective pipe to the cable on the laying ship. , A cable with a protective pipe attached (hereinafter, also referred to as a "cable with a protective pipe") was laid from the laying ship toward the bottom of the water (for example, Patent Document 1).

Japanese Patent No. 5078400

Here, the protective pipe attached to the cable is composed of, for example, a lower pipe and an upper pipe divided in half along the longitudinal direction, and each of the lower pipe and the upper pipe has fitting portions at both ends in the longitudinal direction. doing. When attaching a plurality of protective tubes to a cable, the fitting portions of a pair of lower pipes adjacent to each other in the longitudinal direction are fitted to each other, and the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction are fitted to each other. By doing so, a plurality of protective tubes are connected in a string.

In the conventional method such as Patent Document 1 described above, when attaching a plurality of protective tubes to a cable, a worker lifts a lower tube by operating a lifter, or a worker operates a hoist to lift an upper tube. It was necessary to work to lift the hoist. For this reason, the work efficiency when connecting a plurality of protective tubes in a string of beads is poor, and the work takes time. As a result, it has become difficult to quickly pull out the cable with a protective pipe from the laying ship toward the bottom of the water.

An object of the present invention is to provide a technique capable of efficiently connecting a plurality of protective tubes in a string of beads.

According to one aspect of the invention
A method for manufacturing a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A step of preparing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. The lower pipe connecting process that conveys the lower pipe along the longitudinal direction,
A cable mounting step of mounting the cable on the inside of the plurality of lower pipes and transporting the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. , The upper pipe connecting step of producing the cable with the protective tube and transporting the cable with the protective tube along the longitudinal direction.
In the lower pipe connecting step,
While transporting the plurality of lower pipes along the longitudinal direction, the pair of said pair adjacent to each other in the longitudinal direction by utilizing a step in which the transport height of the plurality of lower pipes changes discontinuously from a high position to a low position. Provided is a method for manufacturing a cable with a protective tube for self-consistent fitting of the fitting portions of the lower tube.

According to another aspect of the invention
A method for manufacturing a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A step of preparing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. The lower pipe connecting process that conveys the lower pipe along the longitudinal direction,
A cable mounting step of mounting the cable on the inside of the plurality of lower pipes and transporting the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. , The upper pipe connecting step of producing the cable with the protective tube and transporting the cable with the protective tube along the longitudinal direction.
In the upper pipe connecting step,
While transporting the plurality of upper pipes along the longitudinal direction, the pair of said pair adjacent to the longitudinal direction by utilizing a step in which the transport height of the plurality of upper pipes changes discontinuously from a high position to a low position. Provided is a method for manufacturing a cable with a protective tube for self-consistent fitting of the fitting portions of the upper tube.

According to still another aspect of the invention.
A manufacturing system for a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A storage area for storing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. A lower pipe connecting mechanism that conveys the lower pipe along the longitudinal direction,
A cable mounting mechanism that mounts the cable on the inside of the plurality of lower pipes and conveys the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. A cable with a protective tube is manufactured, and an upper pipe connecting mechanism for transporting the cable with the protective tube along the longitudinal direction is provided.
In the lower pipe connecting mechanism,
While transporting the plurality of lower pipes along the longitudinal direction, the pair of said pair adjacent to each other in the longitudinal direction by utilizing a step in which the transport height of the plurality of lower pipes changes discontinuously from a high position to a low position. Provided is a cable manufacturing system with a protective tube for self-consistent fitting of the fitting portions of the lower tube.

According to still another aspect of the invention.
A manufacturing system for a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A storage area for storing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. A lower pipe connecting mechanism that conveys the lower pipe along the longitudinal direction,
A cable mounting mechanism that mounts the cable on the inside of the plurality of lower pipes and conveys the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. A cable with a protective tube is manufactured, and an upper pipe connecting mechanism for transporting the cable with the protective tube along the longitudinal direction is provided.
In the upper pipe connecting mechanism,
While transporting the plurality of upper pipes along the longitudinal direction, the pair of said pair adjacent to the longitudinal direction by utilizing a step in which the transport height of the plurality of upper pipes changes discontinuously from a high position to a low position. Provided is a cable manufacturing system with a protective tube for self-consistent fitting of the fitting portions of the upper tube.

According to still another aspect of the invention.
A protective pipe that surrounds the outer circumference of a cable laid on the bottom of the water and is connected in a string along the cable.
A lower pipe that is configured as one of the semi-tubular members that are split in half by a half-split surface along the longitudinal direction and has fitting portions at both ends in the longitudinal direction.
It has an upper pipe which is configured as the other side of the half-split member and has fitting portions at both ends in the longitudinal direction.
At least the lower pipe is provided with a protective pipe that is configured to be self-supporting with its inside facing vertically upward.

According to still another aspect of the invention.
Cables laid on the bottom of the water and
It has a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
The protective tube is
A lower pipe that is configured as one of the semi-tubular members that are split in half by a half-split surface along the longitudinal direction and has fitting portions at both ends in the longitudinal direction.
It has an upper pipe which is configured as the other side of the half-split member and has fitting portions at both ends in the longitudinal direction.
At least the lower tube is provided with a cable with a protective tube that is configured to be self-supporting with its inside facing vertically upward.

According to the present invention, a plurality of protective tubes can be efficiently connected in a string.

It is the schematic sectional drawing orthogonal to the longitudinal direction of the cable with a protective tube which concerns on one Embodiment of this invention. (A) is a schematic front view showing a lower pipe or an upper pipe according to an embodiment of the present invention, (b) is a schematic cross-sectional view taken along the line AA'of (a), and (c) is a schematic cross-sectional view. , (B) is a schematic cross-sectional view taken along the line BB', and (d) is a schematic top view showing a lower pipe or an upper pipe according to an embodiment of the present invention. It is a schematic block diagram which shows the laying ship which concerns on one Embodiment of this invention. It is a schematic top view which shows the manufacturing system of the cable with a protective tube which concerns on one Embodiment of this invention. It is a schematic side view which shows the manufacturing system of the cable with a protective tube which concerns on one Embodiment of this invention. (A) is a schematic top view showing a part of the lower pipe transport path, (b) is a schematic front view showing a part of the lower pipe transport path, and (c) is a schematic front view of the lower pipe transport path. It is a schematic side view which shows a part. (A) is a schematic top view showing a part of the upper pipe transport path, (b) is a schematic front view showing a part of the upper pipe transport path, and (c) is a schematic front view showing a part of the upper pipe transport path. It is a schematic side view which shows a part. (A) to (d) are schematic views which show the lower pipe connecting process. (A) to (c) are schematic views which show the upper pipe connecting process.

<One Embodiment of the present invention>
(1) Cable with Protective Tube and Protective Tube The cable 10 with protective tube and the protective tube 200 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic cross-sectional view orthogonal to the longitudinal direction of the cable with a protective tube according to the present embodiment. FIG. 2A is a schematic front view showing a lower pipe or an upper pipe according to the present embodiment, FIG. 2B is a schematic cross-sectional view taken along the line AA'of FIG. 2A, and FIG. (B) is a schematic cross-sectional view taken along the line BB', and (d) is a schematic top view showing a lower pipe or an upper pipe according to the present embodiment.

In the following, the "longitudinal direction" of the cable 100 or the protective tube 200 or the like can be rephrased as the "axial direction" of the cable 100 or the protective tube 200 or the like. Further, the "diameter direction" of the cable 100 or the protective tube 200 or the like means a direction from the central axis of the cable 100 or the protective tube 200 or the like toward the outer periphery, and in some cases, the "diameter direction" of the cable 100 or the protective tube 200 or the like. It can be rephrased as "short direction". Further, the "circumferential direction" of the cable 100 or the protective tube 200 or the like means a direction along the outer peripheral surface of the cable 100 or the protective tube 200 or the like.

As shown in FIG. 1, the cable 10 with a protective tube of the present embodiment includes a cable 100 and a protective tube 200. The protective tube 200 is arranged so as to surround the outer circumference of the cable 100. Further, a plurality of protective tubes 200 are provided, and the plurality of protective tubes 200 are connected in a string along the cable 100 (in the direction intersecting the paper surface of FIG. 1). The cable 10 with a protective tube is laid on the bottom of the water in a state where a plurality of protective tubes 200 are connected as described above and attached to the cable 100. The "water bottom" in the present embodiment means the sea floor, river bottom, lake bottom, or the like.

(cable)
The cable 100 of the present embodiment is configured as a high-pressure cable laid on the bottom of the water, and specifically, for example, a cross-linked polyethylene insulated vinyl sheathed cable (CV cable: Cross-linked polyethylene insulated PVC sheared cable).

(Protective tube)
As shown in FIG. 1, the protective tube 200 of the present embodiment is configured to surround the cable 100 and protect the cable 100. The protective tube 200 is made of, for example, a metal such as cast iron.

Further, the protective tube 200 is composed of, for example, two semi-tubular members divided in half (divided into two) by a half-split surface 222 along the longitudinal direction. Of the two semi-tubular members, the pipe arranged vertically below is referred to as "lower pipe (lower half-split pipe) 210u", and the pipe arranged vertically above is referred to as "upper pipe (upper half-split pipe) 210t". And.

As shown in FIGS. 2A to 2D, the lower pipe 210u has, for example, a body portion 220, a fitting portion 230, a joint collar portion 242, and a support collar portion 246.

The body portion 220 is formed into, for example, a semi-tubular shape obtained by dividing a cylindrical tube in half by a half-split surface 222 along the longitudinal direction. The body portion 220 is configured so that the cable 100 can be inserted into the hollow portion thereof, and the inner diameter of the body portion 220 is slightly larger than the outer diameter of the cable 100 to be protected.

The fitting portions 230 are provided at both ends of the body portion 220 in the longitudinal direction. A portion provided as one of the fitting portions 230 at one end of the body portion 220 in the longitudinal direction is referred to as a "first fitting portion 232", and a portion provided as the other end of the fitting portion 230 at the other end of the body portion 220 in the longitudinal direction. Is referred to as "second fitting portion 234".

The first fitting portion 232 is formed, for example, in a hollow substantially hemispherical shape. The first fitting portion 232 is configured so that the cable 100 can be inserted into the hollow portion without interfering with the cable 100, and the inner diameter from the center (center point of the hemisphere) of the first fitting portion 232 to the inner peripheral surface is For example, it is larger than the inner diameter of the body portion 220.

The second fitting portion 234 is configured to cover and fit the first fitting portion 232. Specifically, the second fitting portion 234 is formed in a hollow substantially hemispherical shape, like the first fitting portion 232, for example. Further, the inner diameter from the center of the second fitting portion 234 to the inner peripheral surface is substantially equal to, for example, the outer diameter of the first fitting portion 232 (the outer diameter from the center of the first fitting portion 232 to the outer peripheral surface). Or, it is slightly larger than the outer diameter of the first fitting portion 232. As a result, the second fitting portion 234 can be fitted to the first fitting portion 232 and can rotate along the outer peripheral surface of the first fitting portion 232. As a result, the cable 10 with a protective tube can be bent while the plurality of protective tubes 200 are connected.

In the present embodiment, the first fitting portion 232 and the second fitting portion 234 have tensions (their own loads) that pull the plurality of protective tubes 200 to each other when the plurality of protective tubes 200 are connected in a string. It is configured to fit together so that it will not come off even if a supporting tension) is applied. Specifically, the first fitting portion 232 and the second fitting portion 234 each have rigidity that can withstand the above tension. Further, the diameter of the opening formed in the longitudinal end of the body 220 of the second fitting 234 (the longitudinal end of the lower pipe 210u) is larger than the outer diameter of the first fitting 232. Is also getting smaller. As a result, the first fitting portion 232 and the second fitting portion 234 are prevented from coming off even when the above tension is applied.

The joint flange portion 242 is configured as a joint portion (joint piece) to which the lower pipe 210u and the upper pipe 210t are joined. Specifically, for example, the joint flange portions 242 are provided at both ends of the body portion 220 in the circumferential direction. Each joint flange portion 242 extends radially outward from the outer peripheral end of the body portion 220, and forms the same flat surface as the half-split surface 222 of the body portion 220. Further, each joint flange portion 242 has a bolt hole 243 into which a bolt (not shown) for joining the lower pipe 210u and the upper pipe 210t is inserted. A plurality of bolt holes 243 are provided, for example, for each joint flange portion 242. For example, one joining collar portion 242 is configured symmetrically with the other joining collar portion 242 with the central axis of the body portion 220 interposed therebetween. That is, the number of bolt holes 243 in one joint flange portion 242 is equal to the number of bolt holes 243 in the other joint flange portion 242, and the position of the bolt holes 243 in the longitudinal direction of one joint flange portion 242 is It is equal to the position of the bolt hole 243 in the longitudinal direction of the other joint flange portion 242.

The lower pipe 210u of the present embodiment is configured to be self-supporting with its inside facing vertically upward, and has, for example, a support collar portion 246. The support collar portion 246 is configured to support the body portion 220 of the lower pipe 210u from the vertically lower side. As a result, in the manufacturing process of the cable 10 with a protective tube, the lower tube 210u can be stably placed and conveyed with its inside facing vertically upward. Further, when the cable 10 with a protective tube is laid, the cable 10 with a protective tube can be supported by the support flange portion 246 of the lower pipe 210u, and the cable 10 with a protective tube can be directly landed on the bottom of the water.

The support collar portion 246 is provided, for example, between both ends of the body portion 220 in the circumferential direction (for example, near the center of the body portion 220). The support flange portion 246 extends from the outer peripheral surface of the body portion 220 outward in a direction intersecting the half-split surface 222 (for example, a direction perpendicular to the half-split surface 222). Further, the support flange portion 246 is, for example, the most remote end portion (for example) from the vicinity of the end portion of the first fitting portion 232 on the body portion 220 side and the half-split surface 222 of the second fitting portion 234. It extends along the longitudinal direction of the body portion 220 to the top of the sphere). Since the support flange portion 246 is not provided at a position where it overlaps with the first fitting portion 232, the support flange portion 246 has the second fitting portion 234 of the lower pipe 210u to be connected to the first fitting portion 232. When fitted to, it does not interfere with the second fitting portion 234.

Here, in the present embodiment, the end portion of the support flange portion 246 on the side far from the half-split surface 222 is, for example, the farthest end portion of the second fitting portion 234 that is farthest from the half-split surface 222. It constitutes the same surface, or protrudes from the end of the second fitting portion 234 (in the direction perpendicular to the half-split surface 222). When the end portion of the second fitting portion 234 protrudes from the end portion of the support flange portion 246 on the side far from the half-split surface 222, the inside of the lower pipe 210u faces vertically upward. The lower pipe 210u is not supported by the support flange portion 246 but is supported by the end portion of the second fitting portion 234 when the lower pipe 210u is placed in the state of being in the existing state. Since the second fitting portion 234 is formed in a hemispherical shape as described above, when the lower pipe 210u is supported by the end portion of the second fitting portion 234, the lower pipe 210u becomes unstable. , There is a possibility of rolling in the circumferential direction. On the other hand, in the present embodiment, the end portion of the second fitting portion 234 does not protrude from the end portion of the support flange portion 246 on the side far from the half-split surface 222. When the pipe 210u is placed with its inside facing vertically upward, the lower pipe 210u can be supported by the support flange portion 246. As a result, the lower pipe 210u can be stably placed, and it is possible to prevent the lower pipe 210u from rolling in the circumferential direction. Here, the end portion of the support flange portion 246 on the side farthest from the half-split surface 222 constitutes, for example, the same surface as the farthest end portion of the second fitting portion 234 from the half-split surface 222. ing. As a result, the lower pipe 210u can be supported by both the support flange portion 246 and the second fitting portion 234, and can be placed more stably.

Further, in the present embodiment, a pair of support collar portions 246 are provided, for example, with the center of the body portion 220 in the circumferential direction interposed therebetween. As a result, the lower pipe 210u can be supported in a well-balanced manner by the pair of support collars 246. Here, the pair of support collar portions 246 are arranged symmetrically with the center of the body portion 220 in the circumferential direction, for example. As a result, the center of gravity of the lower pipe 210u can be arranged at the center between the pair of support collars 246, and the stability of support by the pair of support collars 246 can be improved. Further, the lower pipe 210u can be supported by the pair of support collars 246 so that the half surface 222 thereof is horizontal.

On the other hand, the upper pipe 210t is arranged on the side opposite to the lower pipe 210u with the cable 100 to be protected sandwiched in a state where the inside thereof faces vertically downward, and is configured to surround the cable 100 together with the lower pipe 210u. ..

In the present embodiment, the upper pipe 210t is configured in the same manner as the lower pipe 210u, for example, and has a body portion 220, a fitting portion 230, a joint collar portion 242, and a support collar portion 246. As a result, the lower pipe 210u and the upper pipe 210t can be manufactured with the same mold, and the manufacturing cost of the protective pipe 200 can be reduced. Further, since the upper pipe 210t is also provided with the support flange portion 246, when the cable 10 with the protective pipe is laid, the cable 10 with the protective pipe rotates in the circumferential direction and the upper pipe 210t is arranged vertically below. Even in this case, the cable 100 with a protective tube can be supported by the support flange portion 246 of the upper pipe 210t, and the cable 10 with a protective tube can be directly landed on the bottom of the water.

In the cable 10 with a protective tube in which the lower tube 210u and the upper tube 210t having the above configuration are attached to the cable 100, the first fitting portion 232 of one lower tube 210u is fitted into the second fitting portion 232 of the other lower tube 210u. By covering and fitting the joint portion 234, a plurality of lower pipes 210u are connected in a string connection along the longitudinal direction. Further, the cable 100 is placed on the inside of the lower pipe 210u, and the upper pipe 210t is arranged so as to surround the cable 100 together with the lower pipe 210u. Further, the first fitting portion 232 of one upper pipe 210t is covered with the second fitting portion 234 of the other upper pipe 210t and fitted, so that the plurality of upper pipes 210t are connected in a row along the longitudinal direction. Is connected to. Further, the joint flange portion 242 of each lower pipe 210u and the joint flange portion 242 of each upper pipe 210t face each other and come into contact with each other, and a bolt is inserted into the bolt hole 243 of the joint flange portion 242 with a nut (not shown). By being fixed, each lower pipe 210u and each upper pipe 210t are joined to each other.

(2) Manufacturing System for Cable with Protective Tube Next, the manufacturing system for the cable with protective tube (hereinafter, also simply referred to as “manufacturing system”) 30 according to the embodiment of the present invention will be described with reference to FIGS. 3 to 7. explain. FIG. 3 is a schematic configuration diagram showing a laying ship according to the present embodiment. FIG. 4 is a schematic top view showing a manufacturing system for a cable with a protective tube according to the present embodiment. FIG. 5 is a schematic side view showing a manufacturing system for a cable with a protective tube according to the present embodiment. FIG. 6A is a schematic top view showing a part of the lower pipe transport path, FIG. 6B is a schematic front view showing a part of the lower pipe transport path, and FIG. 6C is a schematic front view showing a part of the lower pipe transport path. It is a schematic side view which shows a part of the road. FIG. 7A is a schematic top view showing a part of the upper pipe transport path, FIG. 7B is a schematic front view showing a part of the upper pipe transport path, and FIG. 7C is a schematic front view showing a part of the upper pipe transport path. It is a schematic side view which shows a part of the road.

In the following, the "transportation direction" of the cable 100 means the direction in which the cable 100 is conveyed along the longitudinal direction. Further, in the manufacturing system 30, the side to which each member is supplied is referred to as the "upstream side", and the side to which each member is carried out is referred to as the "downstream side". Specifically, for example, the side where the cable 100 is supplied from the cable storage area 410 is referred to as the "upstream side", and the side where the cable 10 with the protective tube is carried out from the manufacturing system 30 is referred to as the "downstream side".

Further, here, the direction in the manufacturing system 30 is defined. Let the horizontal direction be the X direction and the Y direction. Of these, the transport direction of the cable 100 or the cable 10 with a protective tube is the + Y direction, and the direction perpendicular to the Y direction is the X direction. Further, the vertical direction is the Z direction, and the vertically upward direction opposite to the direction of gravity is the + Z direction.

(Cable layer)
As shown in FIG. 3, the laying ship 40 of the present embodiment is configured to extend and lay the cable 10 with a protective tube manufactured by the manufacturing system 30 toward the bottom of the water. For example, the manufacturing system 30 and the shooter 450 are laid. And have. That is, the manufacturing system 30 of the present embodiment constitutes a part of the laying ship 40.

The manufacturing system 30 of the present embodiment is configured to continuously manufacture the cable 10 with a protective tube by attaching a plurality of protective tubes 200 to the cable 100 in a string while transporting the cable 100 in the longitudinal direction. For example, a cable storage area 410, a yagura 420, a cable guide 430, a protective pipe storage area 440, a lower pipe connecting mechanism (lower pipe connecting area) 31, a cable mounting mechanism (cable mounting area) 32, and the like. It has an upper pipe connecting mechanism (upper pipe connecting region) 33.

The cable storage area 410 is configured as, for example, a cable coil in which the cable 100 is wound and stored. The cable storage area 410 is located, for example, substantially in the center of the laying vessel 40.

The yagura 420 is provided vertically above the cable storage area 410, and is configured to lift and support the cable 100 supplied from the cable storage area 410 vertically above the cable storage area 410.

The cable guide 430 is configured to guide the cable 100 from the yagura 420 toward the stern side of the laying ship 40, and extends vertically diagonally downward from the top of the yagura 420 toward the stern side of the laying ship 40. ..

The lower pipe connecting mechanism 31, the cable mounting mechanism 32, and the upper pipe connecting mechanism 33 are provided on the stern side of the laying ship 40 with respect to the cable guide 430, and provide a protective pipe 200 to the cable 100 supplied from the cable guide 430. It is configured to be installed. These mechanisms will be described later.

The protective pipe storage area 440 is arranged vertically below the lower pipe connecting mechanism 31, the cable mounting mechanism 32, and the upper pipe connecting mechanism 33, and stores the lower pipe 210u and the upper pipe 210t constituting the protective pipe 200, for example. It is configured as.

The shooter 450 is provided, for example, at the stern of the laying ship 40, and is configured to extend the cable 10 with a protective pipe from the water surface toward the bottom of the water for laying. The laying vessel 40 or the manufacturing system 30 may be provided with a winch (not shown) or a brake (not shown) on the upstream side of the shooter 450. The shooter 450, winch or brake of the laying ship 40 adjusts the feeding speed of the cable 10 with a protective tube, and at the same time, the transport speed of the cable 100 or the cable 10 with a protective tube in the manufacturing system 30 is adjusted. ..

(3) Lower pipe connecting mechanism, cable mounting mechanism and upper pipe connecting mechanism As shown in FIGS. 4 and 5, in the manufacturing system 30 of the present embodiment, for example, the lower pipe connecting mechanism 31, the cable mounting mechanism 32 and The upper pipe connecting mechanism 33 is arranged in this order from the upstream side to the downstream side and from the vertically lower side to the vertically upper side.

(Lower pipe connection mechanism)
The lower pipe connecting mechanism 31 arranges a plurality of lower pipes 210u so that the insides of the lower pipes 210u face vertically upward, and the fitting portions 230 of the pair of lower pipes 210u adjacent to each other in the longitudinal direction among the plurality of lower pipes 210u. Are fitted together, and a plurality of lower pipes 210u are configured to be conveyed along the longitudinal direction. Specifically, the lower pipe connecting mechanism 31 has, for example, a lower pipe supply path 320, a lower pipe transport path 310, and a part of the main transport path 360. Of these, the main transport path 360 is configured not only as a part of the lower pipe connecting mechanism 31, but also as a part of the cable mounting mechanism 32 and a part of the upper pipe connecting mechanism 33. ing.

The lower pipe supply passage 320 is configured to convey, for example, a plurality of lower pipes 210u supplied from the protective pipe storage area 440 using a hoist (not shown) toward the lower pipe transport passage 310. Specifically, the lower pipe supply path 320 is configured as, for example, a belt conveyor so that a plurality of lower pipes 210u can be conveyed in the horizontal direction by electric power. Further, the lower pipe supply passage 320 is arranged in a direction intersecting the lower pipe transport passage 310 when viewed from the vertical upper side, and here, for example, a direction (+ X) perpendicular to the longitudinal direction of the lower pipe transport passage 310. It is arranged along the direction). Further, the lower pipe supply passage 320 is provided vertically above the position closest to the lower pipe supply passage 320 in the lower pipe transport passage 310, and is directed from the downstream end of the lower pipe supply passage 320 toward the lower pipe transport passage 310. A plurality of lower pipes 210u are sequentially dropped.

The lower pipe transport path 310 is configured to transport a plurality of lower pipes 210u supplied from the lower pipe supply path 320 toward the main transport path 360. In the present embodiment, the lower pipe transport path 310 is configured to be able to transport a plurality of lower pipes 210u by their own weight without using electric power. Specifically, the lower pipe transport path 310 is provided, for example, extending vertically diagonally downward from the upstream side to the downstream side. The lower pipe transport path 310 has, for example, a plurality of lower pipe transport rollers 311. The plurality of lower pipe transport rollers 311 are arranged so that their central axes face in a direction perpendicular to the longitudinal direction of the lower pipe transport path 310 when viewed from the vertical upper side, and are predetermined along the longitudinal direction of the lower pipe transport path 310. Are arranged at intervals of. Thereby, in the lower pipe transport path 310, a plurality of lower pipes 210u can be transported by their own weight.

Here, as shown in FIGS. 6A to 6C, the plurality of lower pipe transport rollers 311 included in the lower pipe transport passage 310 include, for example, a plurality of lower pipe horizontal rollers 312 and a plurality of lower pipe inclined rollers. It has 313 and. The plurality of horizontal rollers 312 for lower pipes are arranged so that their central axes face in the horizontal direction, and are arranged at predetermined intervals along the longitudinal direction of the lower pipe transport path 310, for example. The plurality of lower pipe horizontal rollers 312 can convey the plurality of lower pipes 210u while placing them so that the insides of the lower pipes 210u face vertically upward. A pair of lower pipe inclined rollers 313 among the plurality of lower pipe inclined rollers 313 are arranged between two adjacent lower pipe inclined rollers 312. Further, the pair of inclined rollers 313 for lower pipes are arranged in a state in which their vertical upper portions are opened in a V shape when viewed from the transport direction of the lower pipe transport path 310. Further, the pair of lower pipe tilting rollers 313 are symmetrically arranged with the center of the lower pipe transport path 310 interposed therebetween, and the inclination angles of the pair of lower pipe tilting rollers 313 with respect to the horizontal direction are equal to each other. .. The pair of lower pipe tilting rollers 313 can stably guide the plurality of lower pipes 210u to the arrangement center of the pair of lower pipe tilting rollers 313. It should be noted that the plurality of inclined rollers 313 for lower pipes do not necessarily have to be provided over the entire lower pipe transport passage 310, and may be provided at least in at least a part of the downstream end side of the lower pipe transport passage 310. ..

A part of the main transport path 360 forming a part of the lower pipe connecting mechanism 31 is configured to transport a plurality of lower pipes 210u transported from the lower pipe transport path 310 toward the downstream side. Specifically, the main transport path 360 is provided at a position separated by a predetermined distance vertically downward from the downstream end of the lower pipe transport path 310 toward the downstream side. In other words, the portion of the main transport path 360 closest to the downstream end of the lower pipe transport path 310 is arranged vertically below the downstream end of the lower pipe transport path 310. Further, the main transport path 360 is provided along the lower pipe transport path 310, and is arranged on the same straight line as the lower pipe transport path 310 when viewed from the vertical upper side. As a result, a plurality of lower pipes 210u can be sequentially dropped from the downstream end of the lower pipe transport path 310 toward the main transport path 360. In this embodiment, at this time, a step in which the transport height of the plurality of lower pipes 210u changes discontinuously from a high position to a low position from the downstream end of the lower pipe transport path 310 toward the main transport path 360 is used. Therefore, the fitting portions 230 of the pair of lower pipes 210u that are conveyed adjacent to each other in the longitudinal direction can be self-aligned with each other.

In the present embodiment, the stopper 314 is provided on the vertically upper side of the main transport path 360. The stopper 314 allows the lower lower pipe 210u (the downstream lower pipe 211u described later) to move out of the pair of lower pipes 210u that temporarily overlap on the main transport path 360, while allowing the upper lower pipe 210u (the lower pipe 210u to be described later) to move. It is configured to regulate the movement of the upstream lower pipe 212u), which will be described later. Specifically, the stopper 314 is arranged vertically above the main transport path 360 at intervals so that one lower pipe 210u can be transported. Thereby, the movement of the downstream lower pipe 211u described above can be allowed. On the other hand, when viewed from the vertical upper side, the distance between the downstream end of the lower pipe transport path 310 and the stopper 314 is shorter than, for example, the length of the lower pipe 210u in the longitudinal direction. Thereby, the movement of the upstream lower pipe 212u described above can be restricted. The stopper 314 is configured as, for example, a roller, and its central axis is oriented in the horizontal direction and is arranged in a direction perpendicular to the longitudinal direction of the main transport path 360 when viewed from the vertical upper side. As a result, when the downstream lower pipe 211u moves relative to the upstream lower pipe 212u, the upstream lower pipe 212u can be easily dropped, and the fitting portion 230 and the upstream of the downstream lower pipe 211u can be easily dropped. The fitting portion 230 of the lower side pipe 212u can be easily fitted.

In the present embodiment, a part of the main transport path 360 forming a part of the lower pipe connecting mechanism 31 pulls, for example, a plurality of lower pipes 210u downstream by the feeding force of the cable 10 with a protective pipe by the shooter 450. It is configured to be transported by. Specifically, a part of the main transport path 360 constituting a part of the lower pipe connecting mechanism 31 is provided, for example, inclined vertically diagonally upward from the upstream side to the downstream side. Further, the main transport path 360 has, for example, a plurality of main transport rollers 361. The plurality of main transport rollers 361 are arranged so that their central axes are oriented in the horizontal direction and are oriented in the direction perpendicular to the longitudinal direction of the lower pipe transport path 310 when viewed from the vertical upper side. They are arranged at predetermined intervals along the longitudinal direction. When the main transport path 360 is configured in this way, a force of falling toward the upstream side of the main transport path 360 is applied to the plurality of lower pipes 210u on the main transport path 360 due to their own gravity. By pulling the lower pipe 210u downstream by the feeding force of the cable 10 with a protective tube by the shooter 450 in a state where the lower pipe 210u is connected in a string connection along the longitudinal direction, the tension for pulling the plurality of lower pipes 210u is borne by each other. It can be transported along the main transport path 360 while being carried.

In a part of the main transport path 360 that constitutes a part of the lower pipe connecting mechanism 31, the plurality of main transport rollers 361 may be, for example, a plurality of main horizontal rollers (not shown), similarly to the lower pipe transport path 310. ) And a plurality of main tilting rollers (not shown). In this case, a pair of main tilt rollers among the plurality of main tilt rollers are arranged between two adjacent main horizontal rollers. Further, the pair of main tilting rollers are arranged in a state in which their vertical upper portions are opened in a V shape when viewed from the transport direction of the lower pipe transport path 310. A pair of main tilting rollers can stably guide a plurality of lower pipes 210u to the arrangement center of the pair of main tilting rollers, and the lower pipe 210u and the lower pipe transport path 310 conveyed by the main transport path 360. The lower pipe 210u, which is dropped from the downstream end of the pipe, can be stably fitted. It should be noted that the plurality of main tilting rollers do not necessarily have to be provided over the entire main transport path 360, and are provided at least in at least a part of the main transport path 360 on the side closer to the downstream end of the lower pipe transport path 310. It suffices if it is done.

The lower pipe connecting step using the lower pipe connecting mechanism 31 having the above configuration will be described later.

(Cable mounting mechanism)
The cable mounting mechanism 32 is configured to mount the cable 100 on the inside of the plurality of lower pipes 210u and to convey the cable 100 together with the plurality of lower pipes 210u along the longitudinal direction. Specifically, the cable mounting mechanism 32 has, for example, a cable transport path 330 and a part of the main transport path 360.

The cable transport path 330 is pulled by the feeding force of the cable 10 with a protective tube by the shooter 450, so that the cable 100 supplied from the cable storage area 410 via the yagura 420 and the cable guide 430 is directed toward the main transport path 360. It is configured to carry. The cable transport path 330 is arranged, for example, on the vertically upper side of the lower pipe transport path 310 of the lower pipe connecting mechanism 31, and is arranged on the same straight line as the lower pipe transport path 310 when viewed from the vertically upper side. As a result, the cable 100 transported along the cable transport path 330 can be transported in the same direction as the plurality of lower pipes 210u transported by the lower pipe connecting mechanism 31 when viewed from the vertical upper side.

Further, the cable transport path 330 is provided, for example, extending vertically diagonally downward from the upstream side to the downstream side along the transport direction (+ Y direction) of the cable 100. The cable transport path 330 has, for example, a plurality of cable transport rollers 331. The plurality of cable transport rollers 331 are arranged so that their central axes are oriented horizontally and perpendicular to the longitudinal direction of the cable transport path 330 when viewed from the vertical upper side, and the length of the cable transport path 330 is long. They are arranged at predetermined intervals along the direction. As a result, the cable transport path 330 can guide the cable 100 toward the main transport path 360 while supporting the cable 100 from the vertically lower side.

A part of the main transport path 360 forming a part of the cable mounting mechanism 32 transports the cable 100 transported from the cable transport path 330 toward the downstream side while mounting the cable 100 on the inside of the plurality of lower pipes 210u. It is configured to do. Specifically, the main transport path 360 is provided at a position separated by a predetermined distance vertically downward from the downstream end of the cable transport path 330 toward the downstream side. In other words, the portion of the main transport path 360 closest to the downstream end of the lower pipe transport path 310 is arranged vertically below the downstream end of the cable transport path 330. For example, at least a space capable of transporting the lower pipe 210u is provided between the downstream end of the cable transport path 330 and the portion of the main transport path 360 closest to the downstream end of the lower pipe transport path 310. Further, the main transport path 360 is provided along the cable transport path 330, and is arranged on the same straight line as the cable transport path 330 when viewed from the vertical upper side. As a result, the cable 100 is dropped from the downstream end of the cable transport path 330 toward the main transport path 360, and the cable 100 is placed on the inside of a plurality of lower pipes 210u transported along the main transport path 360 and downstream. It can be transported toward the side.

In the present embodiment, a part of the main transport path 360 forming a part of the cable mounting mechanism 32 is, for example, a cable 100 mounted on the inside of a plurality of lower pipes 210u with a protective tube by a shooter 450. It is configured to be conveyed by pulling it downstream by the feeding force of the cable 10. Specifically, a part of the main transport path 360 constituting a part of the cable mounting mechanism 32 is vertically diagonally upward from the upstream side to the downstream side, for example, like a part of the lower pipe connecting mechanism 31. It is provided so as to be inclined in the direction. Further, a plurality of main transport rollers 361 are also provided in a part of the main transport path 360 forming a part of the cable mounting mechanism 32, similarly to a part of the lower pipe connecting mechanism 31. When the main transport path 360 is configured in this way, a force of falling toward the upstream side of the main transport path 360 is applied to the plurality of lower pipes 210u and the cable 100 on the main transport path 360 due to their own gravity. However, the cable 100 placed on the inside of the plurality of lower pipes 210u can be transported along the main transport path 360 by pulling the cable 100 placed on the inside of the plurality of lower pipes 210u to the downstream side by the feeding force of the cable 10 with the protective tube by the shooter 450. ..

The cable mounting process using the cable mounting mechanism 32 having the above configuration will be described later.

(Upper pipe connection mechanism)
The upper pipe connecting mechanism 33 fits the fitting portions 230 of the pair of upper pipes 210t adjacent to each other in the longitudinal direction among the plurality of upper pipes 210t, and connects the plurality of upper pipes 210t together with the plurality of lower pipes 210u to the cable 100. The cable 10 with a protective tube is manufactured by arranging the cable 10 so as to surround the cable 10, and the cable 10 with a protective tube is conveyed along the longitudinal direction. Specifically, the upper pipe connecting mechanism 33 has, for example, an upper pipe supply path 350, an upper pipe transport path 340, and a part of the main transport path 360.

The upper pipe supply passage 350 is configured to convey, for example, a plurality of upper pipes 210t supplied from the protective pipe storage area 440 using a hoist (not shown) toward the upper pipe transport passage 340. Specifically, the upper pipe supply path 350 is configured as, for example, a belt conveyor so that a plurality of upper pipes 210t can be conveyed in the horizontal direction by electric power. Further, the upper pipe supply path 350 is arranged in a direction intersecting the upper pipe transport path 340 when viewed from the vertical upper side, and here, for example, a direction (+ X) perpendicular to the longitudinal direction of the upper pipe transport path 340. It is arranged along the direction). Further, the upper pipe supply path 350 is provided vertically above the position closest to the upper pipe supply passage 350 among the upper pipe transport passages 340, and is directed from the downstream end of the upper pipe supply passage 350 toward the upper pipe transport passage 340. A plurality of upper pipes 210t are sequentially dropped.

The upper pipe transport path 340 is configured to transport a plurality of upper pipes 210t supplied from the upper pipe supply path 350 toward the main transport path 360. In the present embodiment, the upper pipe transport path 340 is configured to be able to transport a plurality of upper pipes 210t by their own weight without using electric power. Specifically, the upper pipe transport path 340 is provided, for example, extending vertically diagonally downward from the upstream side to the downstream side. The upper pipe transport path 340 has, for example, a plurality of upper pipe transport rollers 341. The plurality of upper pipe transport rollers 341 are arranged so that their central axes face in a direction perpendicular to the longitudinal direction of the upper pipe transport path 340 when viewed from the vertical upper side, and are predetermined along the longitudinal direction of the upper pipe transport path 340. Are arranged at intervals of. As a result, the upper pipe transport path 340 can transport a plurality of upper pipes 210t by their own weight.

Here, as shown in FIGS. 7A to 7C, the plurality of upper pipe transport rollers 341 included in the upper pipe transport passage 340 include, for example, a plurality of upper pipe horizontal rollers 342 and a plurality of upper pipe tilt rollers. It has 343 and. The plurality of horizontal rollers 342 for upper pipes are arranged, for example, so that their central axes face in the horizontal direction, and are arranged at predetermined intervals along the longitudinal direction of the upper pipe transport path 340. By the plurality of horizontal rollers 342 for upper pipes, the plurality of upper pipes 210t can be conveyed while being placed so that the inside of each of them faces vertically downward. A pair of upper pipe inclined rollers 343 among the plurality of upper pipe inclined rollers 343 are arranged between two adjacent upper pipe inclined rollers 342. Further, the pair of inclined rollers 343 for the upper pipe are arranged in a state in which their vertical upper sides are opened in a V shape when viewed from the transport direction of the upper pipe transport path 340. Further, the pair of upper pipe tilting rollers 343 are symmetrically arranged with the center of the upper pipe transport path 340 interposed therebetween, and the inclination angles of the pair of upper pipe tilting rollers 343 with respect to the horizontal direction are equal to each other. .. A pair of upper pipe tilting rollers 343 can stably guide a plurality of upper pipes 210t between the pair of upper pipe tilting rollers 343. Further, the distance between the pair of inclined rollers 343 for the upper pipe is gradually narrowed from the upstream side to the downstream side of the upper pipe transport path 340. On the most downstream side of the upper pipe transport path 340, the distance between the pair of upper pipe inclined rollers 343 at the transport heights of the plurality of upper pipe horizontal rollers 342 when viewed from the transport direction of the upper pipe transport path 340 is large. It is equal to the width of the upper pipe 210t in the lateral direction (the width from the end of one joining flange 242 of the upper pipe 210t to the end of the other joining flange 242). As a result, the plurality of upper pipes 210t can be gradually guided to the arrangement center of the pair of upper pipe inclined rollers 343. It should be noted that the plurality of inclined rollers 343 for the upper pipe do not necessarily have to be provided over the entire upper pipe transport path 340, and may be provided at least in at least a part of the downstream end side of the upper pipe transport path 340. ..

In a part of the main transport path 360 that constitutes a part of the upper pipe connecting mechanism 33, a plurality of upper pipes 210t transported from the upper pipe transport path 340 are arranged together with a plurality of lower pipes 210u so as to surround the cable 100. At the same time, it is configured to be transported toward the downstream side. Specifically, the main transport path 360 is provided at a position separated by a predetermined distance vertically downward from the downstream end of the upper pipe transport path 340 toward the downstream side. In other words, the portion of the main transport path 360 closest to the downstream end of the upper pipe transport path 340 is arranged vertically below the downstream end of the upper pipe transport path 340. For example, a cable mounted on the inside of a plurality of lower pipes 210u between the downstream end of the upper pipe transport path 340 and the portion of the main transport path 360 closest to the downstream end of the upper pipe transport path 340. There is an interval at which 100 can be transported. Further, the main transport path 360 is provided along the upper pipe transport path 340, and is arranged on the same straight line as the upper pipe transport path 340 when viewed from the vertical upper side. As a result, a plurality of upper pipes 210t can be sequentially dropped from the downstream end of the upper pipe transport path 340 toward the main transport path 360, and the dropped upper pipe 210t can be arranged together with the lower pipe 210u so as to surround the cable 100. In this embodiment, at this time, a step in which the transport height of the plurality of upper pipes 210t changes discontinuously from a high position to a low position from the downstream end of the upper pipe transport path 340 toward the main transport path 360 is used. Therefore, the pair of upper pipes 210t that are conveyed adjacent to each other in the longitudinal direction can be self-aligned with each other.

In the present embodiment, the fulcrum roller 344 is provided between the downstream end of the upper pipe transport path 340 and the main transport path 360. The fulcrum roller 344 serves as a fulcrum of the principle of leverage when a plurality of upper pipes 210t are sequentially dropped from the downstream end of the upper pipe transport path 340 toward the main transport path 360, and is the main of the plurality of upper pipes 210t. It is configured to raise the upper pipe 210t (downstream side upper pipe 211t, which will be described later) to be dropped into the transport path 360 first. As a result, the pair of upper pipes 210t that are conveyed adjacent to each other in the longitudinal direction can be stably fitted. This point will be described later.

In the present embodiment, a part of the main transport path 360 forming a part of the upper pipe connecting mechanism 33 has, for example, a protective pipe in which a plurality of upper pipes 210t are arranged together with a plurality of lower pipes 210u so as to surround the cable 100. The cable 10 is configured to be conveyed by pulling it downstream by the feeding force of the shooter 450. Specifically, a part of the main transport path 360 constituting a part of the upper pipe connecting mechanism 33 is inclined vertically diagonally upward from the upstream side to the downstream side, and gradually toward the downstream side, for example. It is provided along the horizontal direction. Further, in a part of the main transport path 360 forming a part of the upper pipe connecting mechanism 33, a plurality of main transport rollers 361 are also provided, similarly to a part of the lower pipe connecting mechanism 31 and a part of the cable mounting mechanism 32. Is provided. When the main transport path 360 is configured in this way, the cable 10 with a protective tube on the main transport path 360 is subjected to a force of falling toward the upstream side of the main transport path 360 due to its own gravity, but is protected. By pulling the cable 10 with a tube downstream by the feeding force of the shooter 450, the cable 10 can be conveyed along the main transport path 360.

The upper pipe connecting step using the upper pipe connecting mechanism 33 having the above configuration will be described later.

(4) Method for Manufacturing Cable with Protective Tube Next, a method for manufacturing the cable with protective tube according to the present embodiment will be described with reference to FIGS. 3 to 9. The method of manufacturing the cable with a protective tube can also be considered as the method of laying the cable with a protective tube.

(Step 1: Preparation process)
First, the cable 100 is wound around the cable storage area 410 arranged substantially in the center of the laying ship 40 to prepare the cable 100.

Further, in the protective pipe storage area 440 arranged vertically below the lower pipe connecting mechanism 31, the cable mounting mechanism 32 and the upper pipe connecting mechanism 33 on the laying ship 40, the lower pipe 210u constituting the protective pipe 200 and the lower pipe 210u Prepare the upper pipe 210t.

(Step 2: Lower pipe connection step)
Next, in the lower pipe connecting step of step 2, the lower pipe connecting mechanism 31 is used to arrange the plurality of lower pipes 210u so that the insides of the lower pipes 210u face vertically upward, and in the longitudinal direction among the plurality of lower pipes 210u. The fitting portions 230 of the pair of adjacent lower pipes 210u are fitted to each other, and the plurality of lower pipes 210u are conveyed along the longitudinal direction. At this time, the transport height of the plurality of lower pipes 210u changes discontinuously from a high position to a low position from the downstream end of the lower pipe transport path 310 toward the main transport path 360 in the longitudinal direction. The fitting portions 230 of the pair of lower pipes 210u that are conveyed adjacent to each other are self-consistently fitted to each other.

Specifically, as shown in FIGS. 4 and 5, first, a plurality of lower pipes 210u are supplied from the protective pipe storage area 440 toward the lower pipe supply path 320 using a hoist. At this time, for example, a plurality of lower pipes 210u are placed on the lower pipe supply path 320 so that the inside of each of them faces vertically downward and the central axis of each is along the direction perpendicular to the lower pipe supply path 320 (). That is, it is placed (along the longitudinal direction of the lower pipe transport path 310). At this time, the second fitting portion 234 of the lower pipe 210u is arranged so as to be on the upstream side. While a plurality of lower pipes 210u are placed on the lower pipe supply passage 320 as described above, they are placed on the lower pipe supply passage 320 by driving the lower pipe supply passage 320 configured as a belt conveyor. A plurality of lower pipes 210u are conveyed along the lower pipe supply path 320 in the lateral direction of the lower pipe 210u at predetermined intervals. In this way, by mounting and transporting the plurality of lower pipes 210u on the lower pipe supply path 320 so that the insides of the lower pipes 210u face vertically downward, each lower pipe 210u is conveyed in the lateral direction. It is possible to prevent each lower pipe 210u from rolling in the circumferential direction due to the vibration of the time.

When each of the plurality of lower pipes 210u reaches the downstream end of the lower pipe supply path 320, the plurality of lower pipes 210u are sequentially placed on the lower pipe transport path 310 from the downstream end of the lower pipe supply path 320 after a predetermined time. Drop in. At this time, utilizing the discontinuous step between the lower pipe supply passage 320 and the lower pipe transport passage 310, the plurality of lower pipes 210u are sequentially inverted vertically up and down on the lower pipe transport passage 310. Drop in. As a result, a plurality of lower pipes 210u are placed on the lower pipe transport path 310 so that the insides of the lower pipes 210u face vertically upward. At this time, each of the plurality of lower pipes 210u is supported by a pair of support collar portions 246 to be self-supporting. Further, at this time, by dropping the plurality of lower pipes 210u onto the lower pipe transport path 310 without changing the orientation in the longitudinal direction, the plurality of lower pipes 210u are centered on the lower pipe transport path 310. The shaft is placed so as to be along the longitudinal direction of the lower pipe transport path 310.

As described above, since the lower pipe transport path 310 is provided so as to extend vertically diagonally downward from the upstream side to the downstream side, if a plurality of lower pipes 210u are sequentially dropped onto the lower pipe transport path 310, , A plurality of lower pipes 210u are conveyed along the lower pipe transport path 310 by their own weight. At this time, of the plurality of lower pipes 210u, the pair of lower pipes 210u adjacent to each other in the longitudinal direction are brought into contact with each other at the ends in the longitudinal direction (ends of the fitting portion 230), and the lower pipe transport path. Transport along 310.

When the plurality of lower pipes 210u are conveyed along the lower pipe transport path 310, each of the plurality of lower pipes 210u is conveyed along the longitudinal direction while being self-supported by the pair of support collar portions 246.

Further, at this time, by transporting the plurality of lower pipes 210u by the pair of lower pipe inclined rollers 313 in the lower pipe transport path 310, the plurality of lower pipes 210u are stably centered on the arrangement center of the pair of lower pipe inclined rollers 313. Can guide you to.

Next, as shown in FIG. 8A, when each of the plurality of lower pipes 210u reaches the downstream end of the lower pipe transport path 310, the plurality of lower pipes 210u are sequentially connected to the downstream end of the lower pipe transport path 310. Drop onto the main transport path 360. At this time, among the plurality of lower pipes 210u, the lower pipe 210u that is first dropped onto the main transport path 360 is referred to as the "downstream side lower pipe 211u", and the lower pipe that is dropped onto the main transport path 360 next to the downstream side lower pipe 211u. 210u is referred to as "upstream lower pipe 212u".

When the downstream lower pipe 211u is dropped onto the main transport path 360, as shown in FIG. 8B, the weight of the plurality of lower pipes 210u transported along the lower pipe transport path 310 causes the downstream lower pipe to be lower. The pipe 212u is projected from the downstream end of the lower pipe transport path 310, and the first fitting portion 232 of the upstream side lower pipe 212u is brought into contact with the downstream side lower pipe 211u.

As shown in FIG. 8C, the first lower pipe 212u on the upstream side is pushed out by the weight of the plurality of lower pipes 210u conveyed along the lower pipe transport path 310. The fitting portion 232 is brought into contact with the stopper 314. Thereby, the movement of the upstream lower pipe 212u can be regulated.

On the other hand, on the main transport path 360, a plurality of lower pipes 210u are transported by pulling them downstream by the feeding force of the cable 10 with a protective tube by the shooter 450. As a result, the downstream lower pipe 211u is conveyed to the downstream side of the main transport path 360 relative to the upstream lower pipe 212u.

As shown in FIG. 8D, the upstream side lower pipe 212u is transported relative to the upstream side lower pipe 212u in a state where the movement of the upstream side lower pipe 212u is restricted. The position where the first fitting portion 232 of No. 232 comes into contact with the downstream lower pipe 211u is relatively shifted to the downstream side of the downstream lower pipe 211u. When the first fitting portion 232 of the upstream lower pipe 212u overlaps with the second fitting portion 234 of the downstream lower pipe 211u when viewed from the vertical upper side, the first fitting portion 232 of the upstream lower pipe 212u is formed. Due to the weight of the upstream side lower pipe 212u, it is dropped into the second fitting portion 234 of the downstream side lower pipe 211u. As a result, the second fitting portion 234 of the downstream lower pipe 211u and the first fitting portion 232 of the upstream lower pipe 212u are fitted.

In this way, utilizing the discontinuous step between the lower pipe transport path 310 and the main transport path 360, the second fitting portion 234 of the downstream lower pipe 211u and the first fitting of the upstream lower pipe 212u are used. The joint portion 232 and the joint portion 232 can be fitted in a self-consistent manner. In the same manner as for the downstream side lower pipe 211u and the upstream side lower pipe 212u and thereafter, the fitting portions 230 of the pair of lower pipes 210u adjacent to each other in the longitudinal direction of the plurality of lower pipes 210u are sequentially fitted to each other. Match.

When a plurality of lower pipes 210u are fitted to each other on the main transport path 360, the plurality of lower pipes 210u are connected in a string connection along the longitudinal direction by the feeding force of the cable 10 with a protective tube by the shooter 450. By pulling to the downstream side, the plurality of lower pipes 210u are conveyed along the main transport path 360 while bearing the tension of pulling each other.

Even when the plurality of lower pipes 210u are conveyed along the main transport path 360, each of the plurality of lower pipes 210u is conveyed along the longitudinal direction while being self-supported by the pair of support collars 246.

(Step 3: Cable mounting process)
Next, in the cable mounting step of step 3, the cable mounting mechanism 32 is used to mount the cable 100 on the inside of the plurality of lower pipes 210u, and the cable 100 is mounted along the longitudinal direction together with the plurality of lower pipes 210u. Transport.

Specifically, as shown in FIGS. 4 and 5, by pulling the cable 100 by the feeding force of the cable 10 with a protective tube by the shooter 450, the cable is mounted from the cable storage area 410 via the yagura 420 and the cable guide 430. The cable 100 is supplied toward the cable transport path 330 of the placement mechanism 32.

When the cable 100 is supplied on the cable transport path 330, the cable 100 is guided along the cable transport path 330 toward the main transport path 360.

When the cable 100 reaches the downstream end of the cable transport path 330, the cable 100 is dropped from the downstream end of the cable transport path 330 toward the main transport path 360. When the cable 100 is dropped onto the main transport path 360, the cable 100 is placed on the inside of a plurality of lower pipes 210u transported along the main transport path 360 and transported toward the downstream side.

At this time, by pulling the cable 100 by the feeding force of the cable 10 with the protective tube by the shooter 450, the cable 100 is brought into the main transport path 360 together with the plurality of lower tubes 210u by the frictional force between the cable 100 and the plurality of lower tubes 210u. Transport along.

Even when the cable 100 is transported along the main transport path 360 together with the plurality of lower pipes 210u, each of the plurality of lower pipes 210u on which the cable 100 is placed is made independent by the pair of support collars 246. While transporting along the longitudinal direction.

(Step 4: Upper pipe connection step)
Next, in the upper pipe connecting step of step 4, the upper pipe connecting mechanism 33 is used to fit the fitting portions 230 of the pair of upper pipes 210t adjacent to each other in the longitudinal direction among the plurality of upper pipes 210t. By arranging the upper tube 210t together with the plurality of lower tubes 210u so as to surround the cable 100, the cable 10 with a protective tube is produced, and the cable 10 with a protective tube is conveyed along the longitudinal direction. At this time, the transport height of the plurality of upper pipes 210t is discontinuously changed from a high position to a low position from the downstream end of the upper pipe transport path 340 toward the main transport path 360 in the longitudinal direction. A pair of upper pipes 210t that are conveyed adjacent to each other are self-aligned with each other.

Specifically, as shown in FIGS. 4 and 5, first, a plurality of upper pipes 210t are supplied from the protective pipe storage area 440 toward the upper pipe supply path 350 using a hoist. At this time, for example, a plurality of upper pipes 210t are placed on the upper pipe supply path 350 so that the inside of each of them faces vertically downward and the central axis of each is along the direction perpendicular to the upper pipe supply path 350 (. That is, it is placed (along the longitudinal direction of the upper pipe transport path 340). At this time, the second fitting portion 234 of the upper pipe 210t is arranged so as to be on the upstream side. While the plurality of upper pipes 210t are placed on the upper pipe supply passage 350 as described above, they are placed on the upper pipe supply passage 350 by driving the upper pipe supply passage 350 configured as a belt conveyor. A plurality of upper pipes 210t are conveyed along the upper pipe supply path 350 in the lateral direction of the upper pipe 210t at predetermined intervals. In this way, by placing and transporting the plurality of upper pipes 210t on the upper pipe supply path 350 so that the inside of each of them faces vertically downward, each upper pipe 210t is conveyed in the lateral direction. It is possible to prevent each upper pipe 210t from rolling in the circumferential direction due to the vibration of the time.

When each of the plurality of upper pipes 210t reaches the downstream end of the upper pipe supply path 350, the plurality of upper pipes 210t are sequentially placed on the upper pipe transport path 340 from the downstream end of the upper pipe supply path 350 after a predetermined time. Drop in. At this time, unlike the lower pipe 210u, a plurality of upper pipes 210t are sequentially dropped onto the upper pipe transport path 340 without inverting their vertical top and bottom. As a result, a plurality of upper pipes 210t are placed on the upper pipe transport path 340 so that the insides of the upper pipes 210t face vertically upward. Further, at this time, by dropping the plurality of upper pipes 210t onto the upper pipe transport path 340 without changing the orientation in the longitudinal direction, the plurality of upper pipes 210t are centered on the upper pipe transport path 340. The shaft is placed so as to be along the longitudinal direction of the upper pipe transport path 340.

As described above, since the upper pipe transport path 340 is provided so as to extend vertically diagonally downward from the upstream side to the downstream side, if a plurality of upper pipes 210t are sequentially dropped onto the upper pipe transport path 340, , A plurality of upper pipes 210t are conveyed along the upper pipe transport path 340 by their own weight. At this time, of the plurality of upper pipes 210t, the pair of upper pipes 210t adjacent to each other in the longitudinal direction are brought into contact with each other at the ends in the longitudinal direction (ends of the fitting portion 230), and the upper pipe transport path. Transport along 340.

At this time, by transporting the plurality of upper pipes 210t by the pair of upper pipe tilting rollers 343 in the upper pipe transport path 340, the plurality of upper pipes 210t are stably guided to the arrangement center of the pair of upper pipe tilting rollers 343. can do.

When each of the plurality of upper pipes 210t reaches the downstream end of the upper pipe transport path 340, the plurality of upper pipes 210t are sequentially dropped onto the main transport path 360 from the downstream end of the upper pipe transport path 340. At this time, of the plurality of upper pipes 210t, the upper pipe 210t that is first dropped onto the main transport path 360 is referred to as the "downstream side upper pipe 211t", and the upper pipe that is dropped onto the main transport path 360 after the downstream side upper pipe 211t. 210t is referred to as "upstream upper pipe 212t".

As shown in FIG. 9A, when the downstream upper pipe 211t is dropped from the downstream end of the upper pipe transport path 340 toward the main transport path 360, the upper pipe 210t on the downstream side of the downstream upper pipe 211t While holding down the first fitting portion 232 of the downstream upper pipe 211t by the second fitting portion 234, the fulcrum roller 344 is used as a fulcrum of the principle of leverage to raise the second fitting portion 234 side of the downstream upper pipe 211t. .. As a result, the downstream upper pipe 211t is tilted vertically diagonally downward at an angle steeper than that of the upstream upper pipe 212t.

When the downstream upper pipe 211t is tilted at a steep angle, as shown in FIG. 9 (b), the upstream upper pipe 212t is caused by the weight of the plurality of upper pipes 210t transported along the upper pipe transport path 340. It is moved toward the downstream end of the upper pipe transport path 340, and the first fitting portion 232 of the upstream upper pipe 212t is brought into contact with the inside of the inclined downstream upper pipe 211t.

On the other hand, on the main transport path 360, the downstream upper pipe 211t is brought into contact with the inside of the downstream upper pipe 211t while the first fitting portion 232 of the upstream upper pipe 212t is brought into contact with the inside of the downstream upper pipe 211t. It is transported to the downstream side of the main transport path 360 relative to 212t.

As shown in FIG. 9C, by transporting the downstream upper pipe 211t to the downstream side of the main transport path 360 relative to the upstream side upper pipe 212t, the upstream side upper pipe 212t is first fitted. The position where the portion 232 abuts on the downstream upper pipe 211t is relatively shifted to the downstream side of the downstream upper pipe 211t. When the second fitting portion 234 of the downstream upper pipe 211t overlaps with the first fitting portion 232 of the upstream upper pipe 212t when viewed from the vertical upper side, the second fitting portion 234 of the downstream upper pipe 211t is formed. Due to the weight of the downstream upper pipe 211t, it is dropped so as to cover the first fitting portion 232 of the upstream upper pipe 212t. As a result, the second fitting portion 234 of the downstream upper pipe 211t and the first fitting portion 232 of the upstream upper pipe 212t are fitted.

In this way, utilizing the discontinuous step between the upper pipe transport path 340 and the main transport path 360, the second fitting portion 234 of the downstream upper pipe 211t and the first fitting of the upstream upper pipe 212t are used. The joint portion 232 and the joint portion 232 can be fitted in a self-consistent manner. In the same manner as for the downstream side upper pipe 211t and the upstream side upper pipe 212t and thereafter, the fitting portions 230 of the pair of upper pipes 210t adjacent to each other in the longitudinal direction of the plurality of upper pipes 210t are sequentially fitted to each other. Match.

When a plurality of upper pipes 210t are fitted to each other on the main transport path 360, the plurality of upper pipes 210t are connected in a string connection along the longitudinal direction by the feeding force of the cable 10 with a protective tube by the shooter 450. By pulling to the downstream side, the plurality of upper pipes 210t are conveyed along the main transport path 360 while bearing the tension of pulling each other. As a result, the plurality of upper pipes 210t can be sequentially arranged together with the plurality of lower pipes 210u so as to surround the cable 100.

When a plurality of upper pipes 210t are arranged together with the plurality of lower pipes 210u so as to surround the cable 100 on the main transport path 360, the joint collar portion 242 of each lower pipe 210u and the joint collar portion 242 of each upper pipe 210t are connected. The lower pipe 210u and the upper pipe 210t are joined to each other by, for example, inserting a bolt into the bolt hole 243 of the joint flange portion 242 and fixing the bolt with a nut.

By the above steps 2 to 4, the cable 10 with a protective tube is manufactured. By continuously performing steps 2 to 4, the cable 10 with a protective tube can be continuously manufactured.

After the cable 10 with a protective tube is manufactured, the cable 10 with a protective tube is conveyed along the longitudinal direction by pulling it downstream by the feeding force of the shooter 450.

Even when the cable 10 with a protective tube is conveyed along the longitudinal direction, each of the plurality of lower tubes 210u of the cable 10 with a protective tube is made to stand on its own by a pair of support flanges 246 in the longitudinal direction. Transport along.

(Step 5: laying process)
Next, in the laying step of step 5, the shooter 450 is used to extend the cable 10 with a protective pipe from the stern of the laying ship 40 toward the bottom of the water and lay it. At this time, the cable 10 with a protective tube is laid toward the bottom of the water while bearing a tension for pulling each other (a tension for supporting their own load) on the plurality of protective tubes 200. At this time, the cable 10 with a protective tube is directly landed on the bottom of the water.

After laying the cable 10 with a protective tube over a predetermined distance, a series of manufacturing steps of the cable 10 with a protective tube (laying step of the cable 10 with a protective tube) is completed.

(5) Effects of the present embodiment According to the present embodiment, one or more of the following effects are exhibited.

(A) In the lower pipe connecting step of step 2, while transporting the plurality of lower pipes 210u along the longitudinal direction, a step in which the transport height of the plurality of lower pipes 210u changes discontinuously from a high position to a low position is formed. Utilizing this, the fitting portions 230 of the pair of lower pipes 210u adjacent to each other in the longitudinal direction are self-aligned. As a result, when fitting the fitting portions 230 of the pair of lower pipes 210u adjacent to each other in the longitudinal direction, it is possible to eliminate the need for the worker to operate an electric motor such as a hoist or a lifter. As a result, a plurality of protective tubes 200 can be efficiently connected in a string.

By efficiently connecting the plurality of protective tubes 200 in a string connection in this way, the time required for the manufacturing process of the cable 10 with the protective tube can be shortened. As a result, the cable 10 with a protective pipe can be quickly delivered from the laying vessel 40 toward the bottom of the water. As a result, it is possible to shorten the time as a whole for laying the cable 10 with a protective tube over a predetermined distance.

(B) In the lower pipe connecting step of step 2, the first fitting portion 232 of the upstream lower pipe 212u is moved upstream by utilizing the discontinuous step between the lower pipe transport path 310 and the main transport path 360. Due to the weight of the lower side pipe 212u, it is dropped into the second fitting portion 234 of the lower side pipe 211u. As a result, the second fitting portion 234 of the downstream lower pipe 211u and the first fitting portion 232 of the upstream lower pipe 212u can be self-consistently fitted. By using the gravity of the lower pipe 210u itself as the fitting force in this way, it is possible to eliminate the need for electric power when fitting the fitting portions 230 of the pair of lower pipes 210u adjacent to each other in the longitudinal direction. Further, it is possible to eliminate the need for adjusting the fitting position of the lower pipe 210u with the intervention of an operator. As a result, the manufacturing cost of the cable 10 with a protective tube can be reduced. As a result, the laying cost of the cable 10 with a protective tube can be reduced.

(C) In the lower pipe connecting step of step 2, a plurality of lower pipes 210u are conveyed by a pair of lower pipe inclined rollers 313 provided in the lower pipe transport path 310. As a result, the plurality of lower pipes 210u can be stably guided to the arrangement center of the pair of lower pipe inclined rollers 313, and the transport position accuracy of the lower pipe 210u in the lower pipe transport path 310 can be improved. As a result, at the discontinuous step between the lower pipe transport path 310 and the main transport path 360, the second fitting portion 234 of the downstream lower pipe 211u and the first fitting portion 232 of the upstream lower pipe 212u are brought into contact with each other. The accuracy of fitting can be improved.

(D) In the upper pipe connecting step of step 4, while transporting the plurality of upper pipes 210t along the longitudinal direction, a step in which the transport height of the plurality of upper pipes 210t changes discontinuously from a high position to a low position is formed. Utilizing this, the fitting portions 230 of the pair of upper pipes 210t adjacent to each other in the longitudinal direction are self-aligned. As a result, when fitting the fitting portions 230 of the pair of upper pipes 210t adjacent to each other in the longitudinal direction, it is possible to eliminate the work of the worker operating the electric motor such as the hoist and the lifter. As a result, a plurality of protective tubes 200 can be efficiently connected in a string connection in the same manner as in the lower pipe connecting step of step 2 described above.

(E) In the upper pipe connecting step of step 4, the downstream upper pipe 211t is formed on the upstream side by the principle of the plumb bob by utilizing the discontinuous step between the upper pipe transport path 340 and the main transport path 360. The second fitting portion 234 of the downstream upper pipe 211t is tilted vertically and diagonally downward at a steeper angle than the pipe 212t, and the first fitting portion of the upstream upper pipe 212t is made to fit by the weight of the downstream upper pipe 211t. Drop it so that it covers 232. As a result, the second fitting portion 234 of the downstream upper pipe 211t and the first fitting portion 232 of the upstream upper pipe 212t can be self-consistently fitted. In this way, by using the principle of leverage and the gravity of the upper pipe 210t itself as the fitting force, electric power is not required when fitting the fitting portions 230 of the pair of upper pipes 210t adjacent to each other in the longitudinal direction. Can be done. Further, it is possible to eliminate the need for adjusting the fitting position of the upper pipe 210t with the intervention of an operator. As a result, the manufacturing cost of the cable 10 with a protective tube can be reduced. As a result, the laying cost of the cable 10 with a protective tube can be reduced.

(F) In the upper pipe connecting step of step 4, a plurality of upper pipes 210t are conveyed by a pair of upper pipe inclined rollers 343 provided in the upper pipe transport path 340. As a result, the plurality of upper pipes 210t can be stably guided to the arrangement center of the pair of upper pipe inclined rollers 343, and the transport position accuracy of the upper pipe 210t in the upper pipe transport path 340 can be improved. As a result, at the discontinuous step between the upper pipe transport path 340 and the main transport path 360, the second fitting portion 234 of the downstream upper pipe 211t and the first fitting portion 232 of the upstream upper pipe 212t are brought into contact with each other. The accuracy of fitting can be improved.

(G) In the laying step of step 5, the cable 10 with a protective tube is laid toward the bottom of the water while bearing a tension for pulling each of the plurality of protective tubes 200. As a result, in the laying process, it is possible to eliminate the need for a connecting member (suspension wire or the like) for connecting the plurality of protective pipes 200.

Here, when laying a cable with a protective tube toward the bottom of the water, for example, a plurality of protective tubes may be connected by a hanging wire. In this case, when laying the cable with a protective tube toward the bottom of the water, the weight of the protective tube added to the cable was reduced by suspending a plurality of protective tubes with hanging wires, and damage to the cable was suppressed. .. However, when connecting a plurality of protective tubes with hanging wires, a lot of manpower is required. For this reason, the work efficiency when connecting a plurality of protective tubes is poor, and the work takes time. As a result, it was difficult to quickly feed the cable with the protective tube toward the bottom of the water. In addition, the member cost of the hanging wire and the labor cost for attaching the hanging wire were incurred. As a result, the manufacturing cost of the cable with a protective tube tends to increase.

On the other hand, in the present embodiment, as described above, by making the plurality of protective tubes 200 bear the tension of pulling them from each other, it is possible to eliminate the need for the connecting member for connecting the plurality of protective tubes 200. .. As a result, the work itself related to the attachment of the connecting member can be eliminated, and the time related to the manufacturing process of the cable 10 with a protective tube can be shortened. As a result, the cable 10 with a protective pipe can be quickly delivered from the laying vessel 40 toward the bottom of the water. In addition, it is possible to reduce the member cost of the connecting member and the labor cost for attaching the connecting member. As a result, the manufacturing cost of the cable 10 with a protective tube can be reduced.

(H) In the laying step of step 5, as described above, the cable 10 with a protective pipe is directly landed on the bottom of the water by eliminating the need for a connecting member (suspension wire or the like) for connecting the plurality of protective pipes 200. Can be done.

Here, as described above, when a plurality of protective tubes are connected by suspension wires, for example, when the cable with the protective tube is landed on the bottom of the water, the cable with the protective tube may be supported by a support base. As a result, it was possible to prevent the hanging wire from being used as an underlay for a cable with a protective tube, and to prevent damage to the protective tube and breakage of the hanging wire. However, when the support base is used as described above, it is necessary to support a plurality of protective tubes by the support base. Furthermore, it was necessary to recover the support base after the cable with the protective tube had landed. For this reason, a lot of manpower is required for the support work and the collection work of the support stand, and it takes time for those works. As a result, it takes a long time to lay the cable with the protective tube over a predetermined distance. In addition, there are labor costs for the members of the support base, the work of supporting a plurality of protective tubes by the support base, and the work of collecting the support base. As a result, the cost of laying a cable with a protective tube tends to increase.

On the other hand, in the present embodiment, as described above, the cable 10 with a protective pipe can be directly landed on the bottom of the water by eliminating the need for a connecting member (suspension wire or the like) for connecting the plurality of protective pipes 200. It is possible to eliminate the need for a support base for supporting the cable 10 with a protective tube. As a result, it is possible to eliminate the work of supporting the plurality of protective tubes 200 by the support base and the work itself of collecting the support base. As a result, it is possible to shorten the time as a whole for laying the cable 10 with a protective tube over a predetermined distance. In addition, it is possible to reduce the member cost of the support base, the labor cost related to the work of supporting the plurality of protective tubes 200 by the support base, and the work of collecting the support base. As a result, the laying cost of the cable 10 with a protective tube can be reduced.

(I) As each of the plurality of lower pipes 210u, each of the plurality of lower pipes 210u can be made to stand on its own in each step by using a pipe that is configured to be self-supporting with its inside facing vertically upward. Can be stably transported.

Here, as described above, when the cable with a protective tube is supported by the support base, the lower pipe or the cable with the protective tube is stabilized by supporting the protective tube on the support base in the manufacturing process of the cable with the protective tube. Was being transported to. However, when the support base is used as described above, it is necessary to support a plurality of protective pipes by the support base, so that the total time for laying the cable with the protective pipe over a predetermined distance is required. There was a tendency for the cost of laying cables with protective tubes to increase.

On the other hand, in the present embodiment, by configuring at least the lower pipe 210u so as to be self-supporting, each of the plurality of lower pipes 210u can be made self-supporting and stable in each step without using the above-mentioned support base. Can be transported. As a result, the time as a whole for laying the cable 10 with a protective tube over a predetermined distance can be shortened, and the laying cost of the cable 10 with a protective tube can be reduced.

Further, in the present embodiment, by configuring at least the lower pipe 210u so as to be self-supporting, it is possible to directly land the cable 10 with a protective tube on the bottom of the water and stably place it on the bottom of the water.

<Other Embodiments of the Present Invention>
Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

In the above-described embodiment, the case where the lower pipe 210u and the upper pipe 210t are configured in the same manner has been described, but the lower pipe 210u and the upper pipe 210t may be different from each other. That is, only the lower pipe 210u may have the support collar portion 246. However, if the lower pipe 210u and the upper pipe 210t are configured in the same manner, the lower pipe 210u and the upper pipe 210t can be manufactured with the same mold, and the manufacturing cost of the protective pipe 200 can be reduced. It is preferable in that it can be done.

In the above-described embodiment, the case where the lower pipe transport passage 310 is configured to be able to transport a plurality of lower pipes 210u by their own weights has been described, but the lower pipe transport passage 310 is configured as a belt conveyor and is powered by electric power. It may be configured so that a plurality of lower pipes 210u can be conveyed toward the main transfer path 360. In this case, the lower pipe transport path 310 may be provided along the horizontal direction. However, it is preferable that the lower pipe transport path 310 is configured to be capable of transporting a plurality of lower pipes 210u by their own weights in that the manufacturing cost of the cable 10 with a protective pipe can be reduced.

In the above-described embodiment, the case where the cable transport path 330 is configured to transport the cable 100 pulled by the feeding force of the cable 10 with the protective tube by the shooter 450 toward the main transport path 360 has been described. The cable transport path 330 may be configured as a belt conveyor so that the cable 100 can be transported toward the main transport path 360 by electric power. In this case, the cable transport path 330 may be provided along the horizontal direction.

In the above-described embodiment, the case where the upper pipe transport path 340 is configured to be capable of transporting a plurality of upper pipes 210t by their own weights has been described. However, the upper pipe transport path 340 is configured as a belt conveyor and is powered by electric power. It may be configured so that a plurality of upper pipes 210t can be conveyed toward the main transfer path 360. In this case, the upper pipe transport path 340 may be provided along the horizontal direction. However, it is preferable that the upper pipe transport path 340 is configured to be capable of transporting a plurality of upper pipes 210t by their own weights in that the manufacturing cost of the cable 10 with a protective pipe can be reduced.

In the above-described embodiment, the main transport path 360 is configured to transport a plurality of lower pipes 210u and cables 10 with protective pipes by pulling them downstream by the feeding force of the cables 10 with protective pipes by the shooter 450. Although the case has been described, the main transport path 360 may be configured as a belt conveyor so that a plurality of lower pipes 210u and cables 10 with protective pipes can be transported toward the downstream side by electric power.

In the above-described embodiment, the case where the stopper 314 is provided on the vertically upper side of the main transport path 360 has been described, but the first fitting portion 232 of the upstream side lower pipe 212u is attached to the downstream side lower pipe 211u. When the movement of the upstream lower pipe 212u can be regulated without using the stopper 314, such as when the upstream lower pipe 212u is not pushed out any more when they are brought into contact with each other, it is not always the case. The stopper 314 may not be provided.

In the above-described embodiment, the case where the fulcrum roller 344 is provided between the downstream end of the upper pipe transport path 340 and the main transport path 360 has been described, but the transport for the upper pipe at the downstream end of the upper pipe transport path 340 has been described. When the roller 341 can raise the second fitting portion 234 side of the downstream upper pipe 211t without using the fulcrum roller 344, such as when the roller 341 can serve as a fulcrum of the lever principle, the fulcrum roller is not necessarily used. 344 may not be provided.

In the above-described embodiment, in the upper pipe connecting step of step 2, the fitting portions 230 of the pair of lower pipes 210u adjacent to each other in the longitudinal direction are self-aligned, and in the lower pipe connecting step of step 4. Although the case where both the fitting portions 230 of the pair of upper pipes 210t adjacent to each other in the longitudinal direction are self-aligned to be fitted to each other is performed, in the upper pipe connecting step of step 2, the fitting portions 230 are adjacent to each other in the longitudinal direction. The fitting portions 230 of the pair of lower pipes 210u are self-aligned with each other, and in the lower pipe connecting step of step 4, the fitting portions 230 of the pair of upper pipes 210t adjacent to each other in the longitudinal direction are self-fitting. Only one of the consistent fittings may be performed.

<Preferable Aspect of the Present Invention>
Hereinafter, preferred embodiments of the present invention will be added.

(Appendix 1)
A method for manufacturing a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A step of preparing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. The lower pipe connecting process that conveys the lower pipe along the longitudinal direction,
A cable mounting step of mounting the cable on the inside of the plurality of lower pipes and transporting the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. , The upper pipe connecting step of producing the cable with the protective tube and transporting the cable with the protective tube along the longitudinal direction.
In the lower pipe connecting step,
While transporting the plurality of lower pipes along the longitudinal direction, the pair of the pair of lower pipes adjacent to each other in the longitudinal direction by utilizing a step in which the transport height of the plurality of lower pipes changes discontinuously from a high position to a low position. A method for manufacturing a cable with a protective tube that self-consistently fits the fitting portions of the lower pipe.

(Appendix 2)
In the lower pipe connecting step,
The plurality of lower pipes are placed vertically upward on the lower pipe transport path extending diagonally downward toward the downstream side, and the inside of each is directed vertically upward, and the central axis of each is in the longitudinal direction of the lower pipe transport path. The plurality of lower pipes are placed in order so as to be along the same direction, and the plurality of lower pipes are conveyed along the lower pipe transport path by their own weight.
From the downstream end of the lower pipe transport path to the main transport path provided along the lower pipe transport path at a position vertically downward by a predetermined distance from the downstream end of the lower pipe transport path toward the downstream side. Drop multiple lower pipes in sequence,
In contrast to the downstream lower pipe that is first dropped onto the main transport path among the plurality of lower pipes, the upstream lower pipe that is dropped onto the main transport path next to the downstream lower pipe among the plurality of lower pipes. The fitting portion of the above is brought into contact with each other.
The position where the downstream lower pipe is transported to the downstream side of the main transport path relative to the upstream lower pipe and the fitting portion of the upstream lower pipe abuts on the downstream lower pipe is described. Manufacture of the cable with a protective tube according to Appendix 1 in which the fitting portion of the downstream lower pipe and the fitting portion of the upstream lower pipe are fitted relative to the downstream side of the downstream lower pipe. Method.

(Appendix 3)
In the lower pipe connecting step,
Appendix 2 for transporting the plurality of lower pipes by a pair of tilting rollers for lower pipes provided in the lower pipe transport passage and arranged so that the vertically upper side is opened in a V shape when viewed from the transport direction of the lower pipe transport passage. The method for manufacturing a cable with a protective tube described in.

(Appendix 4)
A method for manufacturing a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A step of preparing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. The lower pipe connecting process that conveys the lower pipe along the longitudinal direction,
A cable mounting step of mounting the cable on the inside of the plurality of lower pipes and transporting the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. , The upper pipe connecting step of producing the cable with the protective tube and transporting the cable with the protective tube along the longitudinal direction.
In the upper pipe connecting step,
While transporting the plurality of upper pipes along the longitudinal direction, the pair of said pair adjacent to the longitudinal direction by utilizing a step in which the transport height of the plurality of upper pipes changes discontinuously from a high position to a low position. A method for manufacturing a cable with a protective tube that self-consistently fits the fitting portions of the upper tube.

(Appendix 5)
In the upper pipe connecting step,
The plurality of upper pipes are placed vertically downward on the upper pipe transport path extending diagonally downward toward the downstream side, and the inside of each of them faces vertically downward, and the central axis of each is in the longitudinal direction of the upper pipe transport path. The plurality of upper pipes are placed in order along the above pipes, and the plurality of upper pipes are conveyed along the upper pipe transport path by their own weight.
The downstream end of the upper pipe transport path toward the main transport path provided along the upper pipe transport path at a position vertically downward by a predetermined distance from the downstream end of the upper pipe transport path toward the downstream side. The downstream end side of each of the plurality of upper pipes is sequentially dropped from
The downstream upper pipe that is first dropped into the main transport path among the plurality of upper pipes is more than the upstream upper pipe that is dropped into the main transport path next to the downstream upper pipe among the plurality of upper pipes. It is tilted vertically and diagonally downward at a steep angle, and the fitting portion of the upstream side upper pipe is brought into contact with the inside of the tilted downstream side upper pipe.
The position where the downstream upper pipe is conveyed to the downstream side of the main transport path relative to the upstream upper pipe and the fitting portion of the upstream upper pipe abuts on the downstream upper pipe is described. Manufacture of the cable with a protective tube according to Appendix 4 in which the fitting portion of the downstream upper pipe and the fitting portion of the upstream upper pipe are fitted relative to the downstream side of the downstream upper pipe. Method.

(Appendix 6)
In the upper pipe connecting step,
Addendum 5 for transporting the plurality of upper pipes by a pair of inclined rollers for upper pipes provided in the upper pipe transport passage and arranged so as to open the vertically upper side in a V shape when viewed from the transport direction of the upper pipe transport passage. The method for manufacturing a cable with a protective tube described in.

(Appendix 7)
The protective tube according to any one of Supplementary note 1 to 6, further comprising a laying step of laying the cable with the protective tube toward the bottom of the water while causing the plurality of protective tubes to bear the tension of pulling them from each other. Cable manufacturing method.

(Appendix 8)
In the laying process,
The method for manufacturing a cable with a protective tube according to Appendix 7, wherein the cable with a protective tube is directly landed on the bottom of the water.

(Appendix 9)
In the preparation step,
As at least each of the plurality of lower pipes, a pipe configured to be self-supporting with the inside of each pipe facing vertically upward is prepared.
In the lower pipe connecting step, the cable mounting step, and the upper pipe connecting step,
The method for manufacturing a cable with a protective tube according to any one of Supplementary note 1 to 8, wherein each of the plurality of lower tubes is independently conveyed along the longitudinal direction.

(Appendix 10)
A manufacturing system for a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A storage area for storing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. A lower pipe connecting mechanism that conveys the lower pipe along the longitudinal direction,
A cable mounting mechanism that mounts the cable on the inside of the plurality of lower pipes and conveys the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. A cable with a protective tube is manufactured, and an upper pipe connecting mechanism for transporting the cable with the protective tube along the longitudinal direction is provided.
In the lower pipe connecting mechanism,
While transporting the plurality of lower pipes along the longitudinal direction, the pair of said pair adjacent to each other in the longitudinal direction by utilizing a step in which the transport height of the plurality of lower pipes changes discontinuously from a high position to a low position. A manufacturing system for a cable with a protective tube that self-consistently fits the fitting portions of the lower pipe.

(Appendix 11)
A manufacturing system for a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A storage area for storing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. A lower pipe connecting mechanism that conveys the lower pipe along the longitudinal direction,
A cable mounting mechanism that mounts the cable on the inside of the plurality of lower pipes and conveys the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. A cable with a protective tube is manufactured, and an upper pipe connecting mechanism for transporting the cable with the protective tube along the longitudinal direction is provided.
In the upper pipe connecting mechanism,
While transporting the plurality of upper pipes along the longitudinal direction, the pair of said pair adjacent to the longitudinal direction by utilizing a step in which the transport height of the plurality of upper pipes changes discontinuously from a high position to a low position. A manufacturing system for a cable with a protective tube that self-consistently mates the fitting portions of the upper tube.

(Appendix 12)
A protective pipe that surrounds the outer circumference of a cable laid on the bottom of the water and is connected in a string along the cable.
A lower pipe that is configured as one of the semi-tubular members that are split in half by a half-split surface along the longitudinal direction and has fitting portions at both ends in the longitudinal direction.
It has an upper pipe which is configured as the other side of the half-split member and has fitting portions at both ends in the longitudinal direction.
At least the lower pipe is a protective pipe that is configured to be self-supporting with its inside facing vertically upward.

(Appendix 13)
The lower pipe
The body part, which is a semi-tubular body divided in half by the half-split surface,
A first fitting portion provided as one of the fitting portions at one end in the longitudinal direction of the body portion,
A second fitting portion provided at the other end of the body portion in the longitudinal direction as the other end of the fitting portion and covered with the first fitting portion to be fitted.
It has a support collar portion provided between both ends in the circumferential direction of the body portion and extending outward from the outer peripheral surface of the body portion in a direction intersecting the half-split surface.
The end portion of the support flange portion on the side far from the half-split surface forms the same surface as the end portion of the second fitting portion farthest from the half-split surface, or said. The protective tube according to Appendix 12, which protrudes from the end of the second fitting portion.

(Appendix 14)
The protective tube according to Appendix 13, wherein the support collar portions are provided in pairs with the center of the body portion in the circumferential direction interposed therebetween.

(Appendix 15)
The first fitting portion and the second fitting portion are fitted to each other so as not to come off even if a tension for pulling the plurality of protective tubes is applied when the plurality of protective tubes are connected in a string connection. The protective tube according to Appendix 13 or 14.

(Appendix 16)
Cables laid on the bottom of the water and
It has a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
The protective tube is
A lower pipe that is configured as one of the semi-tubular members that are split in half by a half-split surface along the longitudinal direction and has fitting portions at both ends in the longitudinal direction.
It has an upper pipe which is configured as the other side of the half-split member and has fitting portions at both ends in the longitudinal direction.
At least the lower pipe is a cable with a protective pipe that can stand on its own with its inside facing vertically upward.

10 Cable with protective pipe 30 Manufacturing system 31 Lower pipe connecting mechanism 32 Cable mounting mechanism 33 Upper pipe connecting mechanism 40 Laying ship 100 Cable 200 Protective pipe 210t Upper pipe 210u Lower pipe 211u Downstream side Lower pipe 211t Downstream side Upper pipe 212u Upstream side Lower pipe 212t Upstream upper pipe 220 Body part 222 Half-split surface 230 Fitting part 232 First fitting part 234 Second fitting part 242 Joint collar part 243 Bolt hole 246 Support collar part 310 Lower pipe transport path 311 Lower pipe transport Roller 312 Lower pipe horizontal roller 313 Lower pipe inclined roller 314 Stopper 320 Lower pipe transport path 320 Lower pipe supply path 330 Cable transport path 331 Cable transport roller 340 Upper pipe transport path 341 Upper pipe transport roller 342 Upper pipe horizontal roller 343 Upper pipe Inclined roller 344 Supporting point roller 350 Upper pipe supply path 360 Main transport path 361 Main transport roller 410 Cable storage area 430 Cable guide 440 Protective pipe storage area 450 Shooter

Claims (11)

A method for manufacturing a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A preparatory step for preparing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. The lower pipe connecting process that conveys the lower pipe along the longitudinal direction,
A cable mounting step of mounting the cable on the inside of the plurality of lower pipes and transporting the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. , The upper pipe connecting step of producing the cable with the protective tube and transporting the cable with the protective tube along the longitudinal direction.
In the lower pipe connecting step,
While transporting the plurality of lower pipes along the longitudinal direction, the pair of the pair of lower pipes adjacent to each other in the longitudinal direction by utilizing a step in which the transport height of the plurality of lower pipes changes discontinuously from a high position to a low position. A method for manufacturing a cable with a protective tube that self-consistently fits the fitting portions of the lower pipe. In the lower pipe connecting step,
The plurality of lower pipes are placed vertically upward on the lower pipe transport path extending diagonally downward toward the downstream side, and the inside of each is directed vertically upward, and the central axis of each is in the longitudinal direction of the lower pipe transport path. The plurality of lower pipes are placed in order so as to be along the same direction, and the plurality of lower pipes are conveyed along the lower pipe transport path by their own weight.
From the downstream end of the lower pipe transport path to the main transport path provided along the lower pipe transport path at a position vertically downward by a predetermined distance from the downstream end of the lower pipe transport path toward the downstream side. Drop multiple lower pipes in sequence,
In contrast to the downstream lower pipe that is first dropped onto the main transport path among the plurality of lower pipes, the upstream lower pipe that is dropped onto the main transport path next to the downstream lower pipe among the plurality of lower pipes. The fitting portion of the above is brought into contact with the
The position where the downstream lower pipe is transported to the downstream side of the main transport path relative to the upstream lower pipe and the fitting portion of the upstream lower pipe abuts on the downstream lower pipe is described. The cable with a protective tube according to claim 1, wherein the fitting portion of the downstream lower pipe and the fitting portion of the upstream lower pipe are fitted by being relatively displaced to the downstream side of the downstream lower pipe. Production method. In the lower pipe connecting step,
A claim in which a plurality of lower pipes are conveyed by a pair of inclined rollers for lower pipes which are provided in the lower pipe transport passage and are arranged so that the vertical upper side is opened in a V shape when viewed from the transport direction of the lower pipe transport passage. 2. The method for manufacturing a cable with a protective tube according to 2. A method for manufacturing a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A preparatory step for preparing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. The lower pipe connecting process that conveys the lower pipe along the longitudinal direction,
A cable mounting step of mounting the cable on the inside of the plurality of lower pipes and transporting the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. , The upper pipe connecting step of producing the cable with the protective tube and transporting the cable with the protective tube along the longitudinal direction.
In the upper pipe connecting step,
While transporting the plurality of upper pipes along the longitudinal direction, the pair of said pair adjacent to the longitudinal direction by utilizing a step in which the transport height of the plurality of upper pipes changes discontinuously from a high position to a low position. A method for manufacturing a cable with a protective tube that self-consistently fits the fitting portions of the upper tube. In the upper pipe connecting step,
The plurality of upper pipes are placed vertically downward on the upper pipe transport path extending diagonally downward toward the downstream side, and the inside of each of them faces vertically downward, and the central axis of each is in the longitudinal direction of the upper pipe transport path. The plurality of upper pipes are placed in order along the above pipes, and the plurality of upper pipes are conveyed along the upper pipe transport path by their own weight.
The downstream end of the upper pipe transport path toward the main transport path provided along the upper pipe transport path at a position vertically downward by a predetermined distance from the downstream end of the upper pipe transport path toward the downstream side. The downstream end side of each of the plurality of upper pipes is sequentially dropped from
The downstream upper pipe that is first dropped into the main transport path among the plurality of upper pipes is more than the upstream upper pipe that is dropped into the main transport path next to the downstream upper pipe among the plurality of upper pipes. It is tilted vertically and diagonally downward at a steep angle, and the fitting portion of the upstream side upper pipe is brought into contact with the inside of the tilted downstream side upper pipe.
The position where the downstream upper pipe is conveyed to the downstream side of the main transport path relative to the upstream upper pipe and the fitting portion of the upstream upper pipe abuts on the downstream upper pipe is described. The cable with a protective tube according to claim 4, wherein the fitting portion of the downstream upper pipe and the fitting portion of the upstream upper pipe are fitted by being relatively shifted to the downstream side of the downstream upper pipe. Production method. In the upper pipe connecting step,
A claim in which a plurality of upper pipes are conveyed by a pair of inclined rollers for upper pipes which are provided in the upper pipe transport passage and are arranged so as to open the vertically upper side in a V shape when viewed from the transport direction of the upper pipe transport passage. 5. The method for manufacturing a cable with a protective tube according to 5. The protective tube according to any one of claims 1 to 6, further comprising a laying step of laying the cable with the protective tube toward the bottom of the water while causing the plurality of protective tubes to bear the tension of pulling them from each other. How to make a cable with. In the laying process,
The method for manufacturing a cable with a protective tube according to claim 7, wherein the cable with a protective tube is directly landed on the bottom of the water. In the preparation step,
As at least each of the plurality of lower pipes, a pipe configured to be self-supporting with the inside of each pipe facing vertically upward is prepared.
In the lower pipe connecting step, the cable mounting step, and the upper pipe connecting step,
The method for manufacturing a cable with a protective tube according to any one of claims 1 to 8, wherein each of the plurality of lower tubes is independently conveyed along the longitudinal direction. A manufacturing system for a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A storage area for storing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. A lower pipe connecting mechanism that conveys the lower pipe along the longitudinal direction,
A cable mounting mechanism that mounts the cable on the inside of the plurality of lower pipes and conveys the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. A cable with a protective tube is manufactured, and an upper pipe connecting mechanism for transporting the cable with the protective tube along the longitudinal direction is provided.
In the lower pipe connecting mechanism,
While transporting the plurality of lower pipes along the longitudinal direction, the pair of said pair adjacent to each other in the longitudinal direction by utilizing a step in which the transport height of the plurality of lower pipes changes discontinuously from a high position to a low position. A manufacturing system for a cable with a protective tube that self-consistently fits the fitting portions of the lower pipe. A manufacturing system for a cable with a protective tube, which comprises a cable laid on the bottom of the water and a plurality of protective tubes that surround the outer circumference of the cable and are connected in a string along the cable.
A plurality of lower tubes each of the plurality of protective tubes divided in half by a half-split surface along the longitudinal direction and having fitting portions at both ends in the longitudinal direction, and the semi-tubular member. A storage area for storing a plurality of upper pipes, which are configured as the other of the above and have fitting portions at both ends in the longitudinal direction, and the cable.
The plurality of lower pipes are arranged so that the inside of each of the lower pipes faces vertically upward, and the fitting portions of the pair of lower pipes adjacent to each other in the longitudinal direction of the plurality of lower pipes are fitted to each other, and the plurality of lower pipes are fitted to each other. A lower pipe connecting mechanism that conveys the lower pipe along the longitudinal direction,
A cable mounting mechanism that mounts the cable on the inside of the plurality of lower pipes and conveys the cable together with the plurality of lower pipes along the longitudinal direction.
By fitting the fitting portions of a pair of upper pipes adjacent to each other in the longitudinal direction among the plurality of upper pipes, and arranging the plurality of upper pipes together with the plurality of lower pipes so as to surround the cable. A cable with a protective tube is manufactured, and an upper pipe connecting mechanism for transporting the cable with the protective tube along the longitudinal direction is provided.
In the upper pipe connecting mechanism,
While transporting the plurality of upper pipes along the longitudinal direction, the pair of said pair adjacent to the longitudinal direction by utilizing a step in which the transport height of the plurality of upper pipes changes discontinuously from a high position to a low position. A manufacturing system for a cable with a protective tube that self-consistently mates the fitting portions of the upper tube.

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