JPH07110097B2 - Wire holder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a holder for holding an electric wire or a conduit in a sewer pipe, particularly in a small-diameter sewer pipe.

[Prior Art] Conventionally, an electric wire is laid in a sewer pipe. The electric wire is hooked on a hook that is partially inserted and fixed together with an adhesive into a hole formed near the top of the concrete pipe that constitutes the sewer pipe, and is thereby held in the sewer pipe.

[Problems to be Solved by the Invention] By the way, in the case of a sewer pipe made of a concrete pipe, cracks may occur due to perforation or the inner surface of the sewer pipe may be peeled off, particularly when the sewer pipe is an aged pipe. Etc. may occur and the original function of the sewer pipe may be impaired.

Further, a large number of attachment pipes are generally connected to the sewer pipe, but the vicinity of the connection position of the attachment pipe takes into consideration the existence of cracks that may occur when connecting the attachment pipe, and the connection position The hook cannot be attached in the vicinity. Therefore, there is a problem in that the electric wire is forced to meander and extend in the sewer pipe.

An object of the present invention is to eliminate the need for perforating the sewer pipe when laying an electric wire or a conduit pipe in the sewer pipe.

Another object of the present invention is to securely hold an electric wire or a space between electric wires in a sewer pipe.

Further, another object of the present invention is to enable the electric wire or the electric wire tube to be arranged in the vicinity of the connection position of the attachment pipe attached to the sewer pipe.

[Means for Solving the Problem, Action and Effect of the Invention] A holder for holding an electric wire or a conduit for accommodating an electric wire in a sewer pipe according to the present invention receives a force in a radial direction. A main body that expands into a circular shape and abuts on the entire inner surface of the sewer pipe in the circumferential direction of the sewer pipe, and a holding portion that is provided inside the main body and through which an electric wire or a conduit pipe can pass. .

According to the present invention, the holder of the electric wire (or the conduit through which the electric wire is laid) laid in the sewer pipe has a diameter smaller than the inner diameter of the sewer pipe in the unexpanded state, and therefore, is carried in the sewer pipe. be able to. By expanding the main body of the holder and bringing it into contact with the entire inner surface of the sewer pipe in the circumferential direction, the holder does not move firmly to the sewer pipe, that is, does not move in the circumferential direction and the axial direction of the sewer pipe. So that the electric wire or electric wire tube can be securely held in the sewer pipe.

As a result of abutting the electric wire or conduit to the sewer pipe and holding the electric pipe or conduit in the sewer pipe with a retainer that frictionally engages the perforated sewer pipe, which is indispensable for the conventional laying method and thereby the sewer pipe. It is possible to avoid the occurrence of cracks that may occur and the accompanying water leakage. The holder is fixed to the sewer pipe by frictional force as described above, and since there is no need for perforation for fixing, the holder can be arranged near the joint of the mounting pipe. As a result, it is possible to hold the electric wire in the vicinity of the joint portion of the attachment pipe, which has been avoided in the past.

As the holder for the electric wire or the electric wire tube, a holder having a water-proof and elastic sleeve that is in contact with and surrounds the main body can be used. According to this, it is possible to dispose water leakage by arranging the holder at a water leakage location due to aging of the sewer pipe and covering the water leakage location with the sleeve.

In any of the above cases, the sewer pipe is provided in advance with an annular groove open to the inner peripheral surface thereof, and the main body or the main body and the sleeve are fitted into the annular groove when the holder is installed. By making the main body or the sleeve contact the sewer pipe, the holder can be more firmly fixed in the sewer pipe.

The holder is provided on the inner side of the one end with a belt-shaped member having one end portion which is curved in a circular shape and overlaps each other and the other end portion which is located on the inner side of the one end portion, and The other end can be configured with a claw that can be engaged. In this case, the holding portion is provided on the inner side of the other end portion of the belt-shaped member. For example, an inflatable bag body, a jack, or the like is arranged inside the band-shaped member, and a radial force can be exerted on the band-shaped member by inflating the bag-shaped member. It can be expanded to a larger diameter. During the application of the radial force, both ends of the strip-shaped member move in opposite directions, and after the other end passes through the claw, when the radial force is released, the both ends are elasticized. Moves in the opposite direction, and the other end is locked to the claw. as a result,
The expanded state of the belt-shaped member is maintained.

In addition, the main body of the holder is folded into a butterfly shape, and has six arc portions which are continuous with each other or which are hinged to each other.
It can consist of a ring member consisting of two arc-shaped segments. By applying a radial force to the ring member in the sewer pipe, the ring member can be changed to and maintained in the circular expanded state, which is the most stable state.

The holder may be a tube or a hook fixed to the body. Alternatively, the main body may be provided with a pair of parallel cuts, and a portion between the cuts may be extruded inward of the main body to be deformed.

EXAMPLE Referring to FIG. 1, a sewer pipe C (see FIGS. 5, 6 and 8)
(Fig.) Inside the electric wire L (Figs. 13 to 16) or an electric wire tube (not shown) made of a metal tube, a plastic tube or a flexible tube for accommodating the electric wire. A retainer 10 for the electric wire or conduit used to
An example is shown. The sewer pipe C targeted by the present invention may be an existing pipe or a new pipe, and may be made of concrete, metal, plastic, or the like. However, the sewer pipe C shown is a concrete pipe.

The holder 10 is for holding the electric wire or conduit provided inside the main body 12 and the main body 12 that can expand in a circular shape by receiving a force in the radial direction and can maintain the expanded state. Holding part
14 and.

The illustrated main body 12 includes a belt-shaped member 16 made of metal, plastic or the like which is curved in a circular shape, and a claw 18 provided on the belt-shaped member 16.
(See FIGS. 2 and 3). The strip-shaped member 16 has one end 16a overlapping each other and the other end 16b located on the inner side of the one end. The claw 18 is on the inner side of the one end 16a of the strip-shaped member, and the tip of the other end 16b of the strip-shaped member can be locked. The illustrated claw 18 is one end portion 16 of the strip-shaped member.
It is formed by making a U-shaped notch in a and extruding the part surrounded by the notch inward.
It is open to the side of the tip. Instead of the illustrated example, the claw 18 can be configured by a plate member bent into a crank shape and welded to the belt-shaped member 16, for example.

The strip-shaped member 16 is provided with both ends 16a when a radial force is exerted on the strip-shaped member 16 via a suitable expanding means such as an inflatable and defensible bag body 52 (FIG. 13) and a hydraulic jack (not shown). , 16
The b's move in opposite directions while making contact with each other, and the diameter of the strip member 16 increases. When the other end 16b rides on the claw 18 and then contacts the one end 16a again, and then the radial force is released, the other end 16b moves in the opposite direction under the guidance of the one end 16a due to the elasticity of the strip member 16. And a part of its tip is received between the claw 18 and the one end 16a, and hits the claw 18. As a result, the other end portion 16b is locked to the claw 18, whereby the strip-shaped member 16 is maintained in its expanded state. The outer diameter of the strip-shaped member 16 in the expanded state is preset to be substantially equal to the inner diameter of the sewer pipe (see FIG. 5). As a result, the strip-shaped member 16 contacts the entire inner surface of the sewer pipe in the circumferential direction of the sewer pipe, so that the holder 10 does not rotate around the axis of the sewer pipe and does not move in the axial direction. Is fixed to the sewer pipe.

The holding portion 14 is provided on the inner side of the other end portion 16b of the band-shaped member. The illustrated holding portion 14 is made of a tube made of the same material as that of the strip-shaped member 16, is arranged in the axial direction of the strip-shaped member 16, and is welded to the strip-shaped member 16. The wire or conduit is passed through and held by the tube. Instead of forming the holding portion 14 with the tube, for example, a hook (FIG. 2) is used, or a pair of parallel cuts extending in the circumferential direction of the band-shaped member 16 is provided, and the portion between the cuts is a band-shaped member. 16 It can be formed by pushing it inward and deforming it (Fig. 3). Alternatively, further, as provided in the ring member 22 described later, the ring member 22
Can be formed of a hat-shaped cross-section member extending in the axial direction.

FIG. 4 shows another example of the main body 12 of the holder 10. The main body 12 of this example is composed of a ring member 22 having six arcuate portions 20 which are folded in a butterfly shape and which are continuous with each other. 6 arcs 20
4 are defined by three pairs of notches 24 provided at the upper position, the lower position, and the intermediate position as seen in FIG. 4 and extending in the axial direction of the ring member 22, and each pair of notches 24 at the upper and lower positions. Is open to the outer surface of the ring member 22, and the pair of notches 24 at the intermediate position is open to the inner surface of the ring member 22. For this reason, the two pairs of arc portions 20 are folded inward along the pair of notches 24 at the intermediate position. Instead of the arcuate portions that are continuous with each other, a ring member (not shown) composed of six arcuate segments hinged to each other may be used. When a radial force is applied to the ring member 22, the ring member 22 changes to a circular expanded state (see FIG. 6). The circular expanded state is the most stable state, and therefore this state is maintained as long as no centripetal force is exerted. The ring member 22 is also preset so that its outer diameter is approximately equal to the inner diameter of the sewer pipe, so that the expanded ring member 22 can contact the sewer pipe.

The ring member 22 and the hat-shaped cross-sectional member, which is an example of the holding portion 14, are both formed of the same material, for example, a metal or a plastic material. The hat-shaped cross-section member can be fixed to the inner surface of the ring member 22 by welding.

Further, referring to FIG. 7 and FIG. 8, as the holder 10, a sleeve having water-stopping property and elasticity which is in contact with and surrounds the main body 12 (in the illustrated example, the belt-shaped member 16 similar to that shown in FIG. 3). May have 26. According to the holder 10 including the sleeve 26, the main body 12 can be expanded to press the sleeve 26 against the crack generation site of the sewer pipe C and cover the site, thereby preventing water leakage from the site. be able to.

Next, with reference to FIG. 9 to FIG. 16, a method of laying an electric wire using the holder 10 applied to a sewer pipe of a small diameter which an operator cannot enter will be described.

In this laying method, basically, the holding portion 14 of the holder 10 holds the electric wire L, the holder 10 is arranged inside a plurality of sewer pipes C connected to each other (Fig. 13), and then the holder 10 is held. This consists of expanding the body 12 into a circular shape (Fig. 14) until the body 12 of the tool 10 comes into contact with the sewer pipe C.

However, in the case of the illustrated example in which the sewer pipe C is an existing pipe,
In order to remove dirt on the inner peripheral surface of the sewer pipe C in advance, as shown in FIG. 9, for example, high-pressure water is sprayed, and the washer 30 which can be advanced by its thrust is passed through the sewer pipe C and its peripheral surface is removed. It is desirable to wash. In the illustrated example, the washing machine 30 is inserted into the sewer pipe C from one of the pair of manholes M (the manhole on the right side in the figure), while receiving the high pressure water supplied from the high pressure water supply vehicle 32 on the ground. Move to the other manhole M (left manhole).

Furthermore, as shown in FIG. 10, between the two manholes M, the TV camera 36 that is capable of self-propelled inside the sewer pipe C photographs the surface of the cleaned sewer pipe C to check for the presence of cracks 38. It is desirable to keep it. The situation in the sewer pipe C is
It can be observed on a television receiver vehicle 42 electrically connected to the motor vehicle 40.

Next, as shown in FIG. 11, the inner peripheral surface of the sewer pipe C is spaced from each other in the axial direction of the sewer pipe, and is capable of receiving the holder 10, for example, from the width dimension of the main body 12 of the holder. Form a plurality of annular grooves 44 having a width dimension that is slightly greater and a depth dimension that is slightly greater than the thickness dimension of the body. In the illustrated example, the annular groove 44 is formed at the connection point of the sewer pipe C, but it may be formed at other points. The annular groove 44 is also formed in the region including the crack generation location 38. Annular groove 44
Can be formed by using a grinding device 46 having a disc-shaped rotary grinder. The grinder 46 is a rope 48,50
The television camera 36 is connected to the winch 49 installed above the other manhole M via the. The grinding device 46 is moved to a predetermined position by pulling the television camera 36. The grinding work by the grinding device 46 can be performed remotely while taking a picture of the grinding position with the television camera 36 and monitoring it. The winch 48 is used to remove the grinding device 46 separated from the television camera 36 after forming the annular groove 44.

Then, to remove grinding debris, preferably a sewer pipe C
The inside is washed using the washing machine 30 (Fig. 12).

Next, as shown in FIG. 13, the spreader 52 is lowered from the other manhole M into the sewer pipe C and kept waiting. The expander 52 has a cylindrical bag body which is inflated in the direction of the axis of the sewer pipe C and expands when compressed air is supplied from the power vehicle 40 on the ground. The spreader 52 is also connected by a rope 53 to the television camera 36 for its towing and monitoring. Then, the required number of holders 10 are lowered from the other manhole M into the sewer pipe C, the electric wire L wound on the ground reel 54 is passed through the holders 14 of all the holders 10, and one holder is provided. The 10 is placed on the spreader 52 so that it surrounds the bag of the spreader 52. As a result, the holder 10 is arranged such that its axis is parallel to the axis of the sewer pipe C. At this time, the electric wire L
The holding part of the holding tool 10 is positioned above so that the water is located near the top of the sewer pipe C. When there is a water leak point 38 in the installation section of the holder 10, the holder 10 (FIG. 7) having the sleeve 26 is prepared.

As shown in FIG. 14, the holder 10 is sequentially installed in the annular groove 44 from the one manhole M side toward the other manhole M side. More specifically, the spreader 52 on which the one holder 10 is placed is pulled rightward in the figure by the TV camera 36, whereby the holder 10 has a predetermined annular groove 44 forming position, that is, an annular shape. The groove 44 is arranged in a space surrounding the groove 44.
The supply of compressed air through the space tube 56 then causes the body of the retainer 10 to expand so that the body of increased diameter fits into the annular groove 44 and the body or sleeve is lowered. It contacts the circumferential surface defining the annular groove 44 of the water pipe C.
After the one holder 10 is installed, air is evacuated from the bag body of the spreader 52, and the spreader 52 and the television camera 36 are pulled to the left in the figure by operating the winch 48. Then, the above operation is repeated to complete the installation of all holders 10.

After that, the television camera 36 is run to check the installation situation of the holder 10 (Fig. 15). In this way, the electric wire L is indirectly fixed to the sewer pipe C via the plurality of holders 10, whereby the electric wire L is laid inside the sewer pipe C. The wires L between each pair of manholes are later connected to each other (16th
Figure).

In order to lay the electric wire later, instead of the electric wire, a flexible conduit (not shown) is passed through the holding portion of the holder 10, and the electric wire is laid in the same manner as in the laying of the electric wire. Pipes can be laid. The conduit may be a rigid tube having no flexibility. In this case, for example, a plurality of short pipes are connected in the manhole M to form the rigid pipe.

Further, without forming the annular groove 44, the holder 10 may be directly fixed to the sewer pipe C that has or has not been cleaned. When the annular groove 44 is formed, the holder 10 is fitted into the annular groove 44, which has an advantage that the resistance of sewage is small.

In the illustrated example, the holder of the present invention is applied to a small-diameter sewer pipe, but it is also applicable to a large-diameter sewer pipe into which an operator can enter.

[Brief description of drawings]

FIG. 1 is a perspective view of a holder according to the present invention, FIGS. 2 and 3 are partial elevation views of another example of the holder having different holders,
FIG. 4 is a perspective view of a holder of another example having a different main body, and FIG.
FIGS. 7 and 8 are cross-sectional views of the holder shown in FIG. 1 and the holder shown in FIG.
FIGS. 8 and 9 are cross-sectional views of another example of the holder having a sleeve and the holder arranged in the sewer pipe, FIG. 9, FIG. 10, FIG. 11, FIG. 12, FIG. Figure, No. 14
FIG. 15, FIG. 15 and FIG. 16 are process drawings showing the procedure for laying an electric wire. 10: Holder, 12: Main body, 14: Holding part, 16: Band-shaped member, 18: Claw,
22: Link member, 24: Notch, 26: Sleeve, 44: Annular groove,
C: sewer pipe, L: electric wire.

Claims (8)

[Claims] 1. A holder for holding an electric wire or a conduit in a sewer pipe, which expands into a circular shape by receiving a force in a radial direction, and an inner surface of the sewer pipe in a circumferential direction of the sewer pipe. A main body that abuts all of the main body, and a holding portion that is provided inside the main body and through which an electric wire or conduit can pass.
Holding device. 2. A body for holding an electric wire or an electric wire in a sewer pipe, the main body being capable of expanding in a circular shape by receiving a force in a radial direction and maintaining the expanded state, and the main body of the main body. A holder having a holding portion which is provided inward and through which an electric wire or a conduit can pass, and a sleeve which is in contact with the main body and surrounds the main body and which has water-stopping property and elasticity. 3. The belt-shaped member, which is curved in a circular shape and has one end portion which overlaps with each other and the other end portion which is located inward of the one end portion, and which is provided inward of the one end portion, The front end of the other end portion has a claw that can be locked, and the holding portion is provided on an inner side of the other end portion of the band-shaped member. ) Described in the above. 4. The holder according to claim 1, wherein the main body comprises a ring member formed of six arcuate portions which are folded in a butterfly shape and which are continuous with each other. 5. The holder according to claim 1, wherein the main body comprises a ring member formed of six arc-shaped segments that are hinged to each other and are folded in a butterfly shape. 6. The holder according to claim 1, wherein the holder is a tube fixed to the main body. 7. The holder according to claim 1, wherein the holder comprises a hook fixed to the main body. 8. The holding portion is formed by forming a pair of parallel cuts in the main body, and pushing a portion between the cuts inward of the main body to deform the main body. Holder described.