JP2843706B2 - Cable manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable manufacturing method for manufacturing a cable for a stay of a cable-stayed suspension bridge, for example.

[0002]

2. Description of the Related Art Generally, parallel wire cables (PWS) are used for stays of suspension bridges. This type of parallel cable consists of a large number of wires aligned and bundled in parallel.
It has advantageous properties for stays of suspension bridges with high cutting load strength and low elastic modulus.

[0003] Such a parallel wire cable is wound around a bobbin and conveyed to a construction site of a suspension bridge. However, since the wires are aligned in parallel, the bundled shape of the parallel wire cable when it is wound around the bobbin is It is difficult to wrap it properly and it takes a lot of trouble and time.

Therefore, it is conceivable to twist each wire into a rope structure. However, if the wires are twisted into a rope structure, each wire is twisted around its axis and causes plastic deformation. A so-called twisting occurs, the cutting load strength and the elastic modulus decrease, and it becomes difficult to maintain good properties for stays of suspension bridges.

[0005] For these reasons, in recent years, as a method of manufacturing this kind of cable, a pair of first and second converging plates and a number of mirror plates following the first and second converging plates have been placed on a traveling line on which the wire travels from the tip end thereof. Are arranged, a large number of wires are passed through these focusing plates and end plates, the respective wires are bound by the first and second focusing plates, and the outer periphery thereof is restrained.
While holding the first focusing plate in a non-rotating state, rotating each end plate in this state, and rotating the second focusing plate so as to be delayed by half a rotation from the end plate, each wire is connected to the end of the traveling line. Means have been developed to run towards the side and add a large pitch twist to the entire wire to form a cable.

[0006] The cable manufactured by such a method has an advantage that it has a cutting load strength and an elastic coefficient substantially equal to those of the parallel wire cable, and can be wound around a bobbin without incurring a large shape collapse due to twisting. There is.

[0007]

In recent years, as a cable for a stay of a suspension bridge, a long cable exceeding 200 m and reaching about 300 to 500 m has been required due to the appearance of a large bridge such as a strait crossing bridge. It has become to.

In the case of manufacturing such a long cable, the focusing plate and the end plate must be arranged on a straight line corresponding to the length. That is, it is necessary to secure a long-distance space and a building corresponding to the length of the manufacturing plant. However, it is practically difficult to secure such a long-distance space on the factory premises.

The present invention has been made in view of such a point, and an object of the present invention is to provide a cable capable of efficiently manufacturing a cable in a space shorter than the length of the cable to be manufactured. It is to provide a manufacturing method of.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, a first and second focusing plates and a plurality of focusing plates are arranged on a traveling line on which a wire travels from a tip end thereof. Are arranged in parallel with each other along the traveling line by passing a number of wires through the focusing plate and the focusing plate, and holding the first focusing plate in a non-rotating state. Direction, and while the second focusing plate is rotated so as to be delayed by a half turn from the end plate, the wires are run toward the tip side of the running line to twist the wires with a large pitch. In addition, in the method of manufacturing a cable, a running line having a radius R equal to or greater than 100d (d is the diameter of the wire) is curved in the middle of a running line for running the wire, and the running line is bounded by the curved portion. After The straight section on the side is bent at a right angle or more with respect to the straight section on the tip side, the first and second focusing plates and the respective end plates are arranged on the bent running line, and the wire is supplied near the first focusing plate. A mechanism is provided, wires are sequentially drawn from the wire supply mechanism, and the drawn wires are passed from the first focusing plate to the second focusing plate and the respective end plates to be paralleled, and in this state, the second focusing plate and each 3. A cable is manufactured by running each wire toward a tip end of the running line while driving a head plate.
According to the invention described in the above, the first and second focusing plates and a large number of end plates are arranged from the tip side on a traveling line on which the wires travel, and the wires are passed through the focusing plate and the end plate through a large number of wires. Parallel along the line,
While holding the first focusing plate in a non-rotating state, in this state, rotating each end plate in the same direction, and rotating the second focusing plate so as to be delayed by half a rotation from the end plate, the wires are connected to each other. In a method of manufacturing a cable by applying a large pitch twist to the entire wire by running toward the tip side of the running line, a radius R of 100 d (d is the length of the wire) The entire travel line is bent into a U-shape by bending it into a semicircle with a curvature of a diameter not less than the diameter), and the first and second focusing plates and the respective end plates are placed on the U-shaped run line. A wire supply mechanism is provided in the vicinity of the first focusing plate, wires are sequentially pulled out from the wire feeding mechanism, and the drawn wires are passed through the second focusing plate and the respective end plates from the first focusing plate. In parallel, this state While driving the second focusing plate and the end plate to each wire to travel toward the distal end side of the traveling wire is characterized by the production of cables.

[0011]

In the present invention, a long cable can be manufactured in a space in a section shorter than the length of the cable to be obtained, since the middle of the travel line for running the wire is curved and the whole is bent. Become. A wire supply mechanism is provided in the vicinity of the first collecting plate, and a wire drawn from the wire supplying mechanism can be passed through each of the end plates starting from the first collecting plate, thereby manufacturing cables having different lengths. Even in this case, the wires can be efficiently set on the focusing plate and the end plate by using the common wire supply mechanism.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment, in which reference symbol P is a travel line for running a wire w, and the travel line P is curved in a semicircular shape in the middle and bent in a U-shape as a whole. A pair of first and second focusing plates 1a and 1b and a large number of end plates 1c are arranged on the traveling line P from the tip end thereof at intervals of, for example, about 1 m.

As shown in FIG. 2A, the first focusing plate 1a has, for example, a two-piece structure and has a circular focusing port 2 on the inner periphery thereof. And bind the outer periphery thereof. Second focusing plate 1b
As shown in FIG. 2 (B), for example, it is configured in a three-piece structure, and the inner diameter of the focusing port 3 on the inner periphery thereof is the first focusing plate 1a.
Is slightly larger than the inner diameter of the focusing port 2. As shown in FIG. 2 (C), each end plate 1c is provided with a large number of, for example, 421 guide holes 4 for inserting the wire w.

The first focusing plate 1a is a frame (not shown)
And the second focusing plate 1b and the respective end plates 1c arranged on the subsequent side thereof are rotatably supported by the frame. Then, the second focusing plates 1b rotate so that the respective mirror plates 1c rotate in the same direction at the same time, and the second focusing plates 1b rotate in the same direction with a delay of half a rotation with respect to the rotation of the mirror plates 1c.
The respective end plates 1c are driven via a driving mechanism (not shown).

The traveling line P is divided into a first straight section P1, a second straight section P2, and a curved section P3 therebetween. The distance of the first straight section P1 is L1, When the distance of the second straight section P2 is L2 and the radius of curvature of the curved portion P3 is R, the distance L1 is 150 to 250 m, and the distance L2 is
150 to 250 m, and the radius R is R ≧ 100d (d: diameter of the wire w). Now, in this embodiment, L1 = 220
m, L2 = 150 m, R = 5 m (diameter of wire w; 7 mm)
This is an example in which a cable of approximately 400 m is manufactured.

A wire supply mechanism 5 is provided near the first focusing plate 1a.
An endless transport path 6 made of rails or the like is provided so as to be arranged at right angles to the above, and a wire holder 7 such as a bobbin or a T carrier can be moved along the transport path 6 by, for example, 421
Each of them is provided evenly. A wire w having a diameter of 7 mm and a length of about 400 m is wound around each wire holder 7.

In such a state, the wire w is pulled out from each of the wire holders 7 of the wire supply mechanism 5, and the convergence plates 1a and 1 are arranged so that the wire w is arranged at the foremost side of the traveling line P.
b through the guide holes 4 of the respective end plates 1c on the rear side thereof sequentially from the converging ports 2 and 3 to support 421 wires w on the traveling line P via the converging plates 1a and 1b and the respective end plates 1c. And make them parallel.

Then, the distal end of the wire w extending from the focusing port 2 of the first focusing plate 1a on the foremost side is fastened by a socket (not shown), and in this state, the second focusing is performed via a driving mechanism. While rotating the plate 1b and each end plate 1c at a low speed in the same direction, the wire w is pulled by a jack (not shown) to the leading end side of the traveling line P to be run sequentially, and the drawn side is sequentially wound around the outer periphery of the bobbin 8. .

Here, the first focusing plate 1a is in a non-rotating state, and the second focusing plate 1b is in a relationship of rotating by a half rotation with respect to the rotation of each of the head plates 1c. As the vehicle travels, a large twist of, for example, a pitch of about 8 m is applied to the wire w between the first focusing plate 1a and the end plate 1c disposed on the most distal end side. At this time, a twisting torque is applied to each wire w. The relationship between the torsion torque and the stress of the wire w can be obtained by the following equation. T = ｛(πd ³ ) / 16｝ · τ T; torque d; wire diameter τ; torsional stress The torque for plastic deformation in the case of a 7 mm diameter wire, that is, the torsional yield torque, is calculated as follows from the above equation. Torsional yield torque = 370kgf · cm

On the other hand, FIG. 4 shows the measurement results of the relationship between the length of the wire w and the pulling force when the wire w is arranged linearly, and the relationship between the length and the torque applied to the wire w.
When the wire w is bent in a semicircular shape, the measurement results of the relationship between the radius and the pull-out force and the relationship between the radius and the torque applied to the wire w at the curved portion are shown in FIG.
Shown in

From these relationships, the total length of this embodiment is 400 m.
When the magnitude of the pull-out force and the torque in the case of the wire w is obtained, the straight-line portion is 370 m and the curved portion is 30 m, so that the pull-out force (y) is y = (0.15 × 370) + 2.5 = 58.0 ( kgf), the torque (y) is y = (0.068 x 370) + 8.0 = 33.2 (kgfcm).

Here, the torsional yield torque of the wire w is 370 kgf · cm as described above, and therefore, in this embodiment, the value of the torque applied to the wire w is much lower than the value of the torsional yield torque.

For this reason, each wire w is once twisted between the converging plate 1a and the head plate 1c on the forefront side as it travels. However, since the torque value is less than the elastic limit, no plastic deformation occurs. Only elastically deforms. Then, the torsion applied to the wire w is sequentially sent to the rear side of the wire w by its elastic force, and the wire w is not twisted in the direction around its axis, but simply twists elastically in a gentle spiral shape. State.

That is, in the usual twisting of ropes,
As shown in FIG. 3A, the wire w is twisted and helically twisted until it is plastically deformed. However, in the method of this embodiment, as shown in FIG. The body itself is not twisted, but is simply elastically deformed in a spiral form, resulting in a so-called belly-back twist state.

Therefore, the cable manufactured by the method of the present invention maintains almost the same mechanical properties as ordinary parallel cable. And since the whole cable is twisted at a large pitch, without causing a big shape collapse,
It can be wound around the outer periphery of the winding frame 8 relatively easily.

In manufacturing such a cable, the running line P for running each wire w is bent so as to make a U-turn in the middle thereof, so that the section is significantly shorter than the length of the cable to be obtained. Can be manufactured in the space of

Further, a wire supply mechanism 5 is provided near the first focusing plate 1a disposed at the foremost side of the traveling line P. Therefore, for example, when a wire w of 400 m is set on the traveling line P, Even if a shorter wire, e.g., 300 m, is set, there is an advantage that the wire can always be set efficiently using the common wire supply mechanism 5 without changing the supply position.

In particular, for stays of a cable-stayed suspension bridge, many types of cables having different lengths are required in many stages, and in such a case, many types of cables having different lengths can be efficiently used. This is advantageous in that it can be manufactured.

The outer periphery of the manufactured cable can be coated with a resin tape. In the straight sections P1 and P2 of the running line P, a large number of pipes are passed between the end plates 1c. Wire w passing through guide hole 4
May be run through these pipes.

The radius of curvature R of the curved portion P3 of the traveling line P is represented by R
The reason for setting ≧ 100d is that if R <100d, the wire w
When the vehicle travels on the curved portion P3, the wire w has a bending tendency at this portion.

FIG. 6 shows a second embodiment of the present invention. In the second embodiment, the middle of a running line P for running a wire w is curved at a gentle angle to a substantially right angle. The focusing plates 1a and 1b and the respective end plates 1c are arranged along P. Even in such a state, since the running line P is bent, the manufacturing can be performed in a space in a section shorter than the length of the cable to be obtained.

[0033]

As described above, according to the present invention,
Since the running line for running the wire is curved and partially bent, the long cable can be manufactured in a space in a section shorter than the length of the cable to be obtained. Since the wire supply mechanism is provided in the vicinity of the focusing plate, even when manufacturing cables having different lengths, always pull out the wire from the common wire supplying mechanism and pass the wire from the focusing plate to each end plate. Therefore, there is an advantage that cables having different lengths can be efficiently manufactured.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a front view of a head plate in the embodiment.

FIG. 3 is an explanatory diagram for explaining the operation of the embodiment.

FIG. 4 is a graph showing a relationship between a length of the wire and a pull-out force when the wire is linearly arranged, and a relationship between the length and a torque applied to the wire.

FIG. 5 is a graph showing the relationship between the radius and the pull-out force at the curved portion and the relationship between the radius and the torque applied to the wire when the wire is bent in a semicircular shape.

FIG. 6 is a plan view showing a second embodiment of the present invention.

[Explanation of symbols]

 1a, 1b: Collection side plate 1c: End plate 5: Wire supply mechanism w: Wire P: Traveling line

Claims (2)

(57) [Claims] A first and a second focusing plate and a large number of end plates are arranged on a traveling line on which a wire travels from the leading end thereof, and the wires are passed through the traveling line by passing a large number of wires through the focusing plate and the end plate. , The first focusing plate is held in a non-rotating state, and in this state, each end plate is rotated in the same direction, and the second focusing plate is rotated so as to be delayed by half a rotation from the end plate. A method of manufacturing a cable by running each of the wires toward the tip end of the running line while applying a twist at a large pitch to the entire wire , wherein the radius of the running line on which the wires run is 100 d.
(D is the diameter of the wire)
The straight section on the rear end of the running line
Bend more than a right angle to the straight section on the tip side, and
The first and second focusing plate and the end plate disposed on the travel line that, said wire supply mechanism provided in the vicinity of the first focusing plate, sequentially pull the wire from the wire supply mechanism, wherein the drawer wire The first focusing plate is passed through the second focusing plate and the respective end plates to be arranged in parallel, and in this state, while driving the second focusing plate and the respective end plates, each wire is caused to travel toward the distal end side of the traveling line. A method for manufacturing a cable, comprising manufacturing the cable. 2. A first and a second focusing plate and a large number of end plates are disposed on a traveling line on which a wire travels from the front end thereof, and the wires are passed through the traveling line by passing a large number of wires through the focusing plate and the end plate. , The first focusing plate is held in a non-rotating state, and in this state, each end plate is rotated in the same direction, and the second focusing plate is rotated so as to be delayed by half a rotation from the end plate. A method of manufacturing a cable by running each of the wires toward the tip end of the running line while applying a twist at a large pitch to the entire wire, wherein the radius of the running line on which the wires run is 100 d.
(D is the diameter of the wire) and is bent in a semi-circle with a curvature of a size equal to or greater than that of the wire so that the entire running line is bent into a U-shape.
The first and second focusing plates and the respective end plates are arranged on a traveling line bent in a letter shape, a wire supply mechanism is provided in the vicinity of the first focusing plate, and wires are sequentially pulled out from the wire supply mechanism. The wires are passed from the first focusing plate to the second focusing plate and the respective end plates and are arranged in parallel. In this state, while driving the second focusing plate and the respective end plates, the respective wires are directed toward the leading end of the traveling line. And manufacturing the cable by running the cable.