JPH05277604A - Manufacture of cable - Google Patents

Abstract

PURPOSE:To provide the manufacture of the cable that the cable is efficiently manufactured within the space shorter than the length of the cable to be manufactured. CONSTITUTION:The cable is manufactured by passing many pieces of wire w through a converging plates 1a, 1b and an end plate 1c arranged on the running line P, running each wire w toward the top end side of the running line P while driving the converging plate 1b and each end plate 1c so as to rotate the converging plate 1b later by half rotation than the rotation of each end plate 1c, and applying the twist of larger pitch to the total of wire w. And the wire w is curved with the gentle radius of curvature on the way of the running line P for running the wire w, the converging plates 1a, 1b and the end plate 1c are arranged on this running line P, a wire feeding mechanism 5 is provided on the neighborhood of the 1st converging plate 1a, the wire w is orderly pulled out from this wire feeding mechanism 5, the pulled wire w are juxtaposed by passing through from the 1st converging plate 1a to the 2nd converging plate 1b and each end plate 1c, and the cable is manufactured by running each wire w toward the top end side of the running line P while driving the 2nd converging plate 1b and each end plate 1c in this state.

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 stays 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 kind of parallel wire cable is a bundle of many wires that are arranged in parallel.
It has advantageous properties for stays of suspension bridges, such as high cutting load strength and low elastic modulus.

Such a parallel wire cable is wound around a winding frame and conveyed to the construction site of a suspension bridge. However, since the wires are aligned in parallel, when the winding wire is wound around the winding frame, its converging shape. It is difficult to wrap it properly and it takes a lot of time and effort.

Therefore, it is conceivable to twist each wire into a rope structure. However, when the wires are twisted into a rope structure, each wire is twisted in the direction around its axis and plastic deformation occurs. As a result, So-called twisting occurs, the cutting load strength and elastic modulus decrease, and it becomes difficult to maintain good characteristics for stays of suspension bridges.

For these reasons, in recent years, as a method of manufacturing a cable of this type, a pair of first and second focusing plates and a number of end plates following the focusing plate are provided on the running line along which the wire is run from the tip side thereof. Are arranged respectively, and a large number of wires are passed through the focusing plate and the mirror plate, and the wires are bound by the first and second focusing plates to restrain the outer periphery thereof,
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 lag behind the end plate by half a turn, each wire is moved to the tip of the running line. A means has been developed in which the cable is run toward the side and twisted at a large pitch over the entire wire to form a cable.

The cable manufactured by such a method has substantially the same breaking load strength and elastic modulus as a parallel-wire cable, and has the advantage that it can be wound around a bobbin without causing a large deformation due to its twisting. There is.

[0007]

Recently, as cables for stays of suspension bridges, long cables reaching more than 200 m and reaching 300 to 500 m are required due to the advent of large bridges such as strait crossing bridges. It has become to.

When manufacturing such a long cable, the focusing plate and the mirror 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 within the premises of the manufacturing plant. However, it is practically difficult to secure such a long-distance space in the factory premises.

The present invention has been made in view of such a point, and an object thereof is to provide a cable which can be efficiently manufactured 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 such an object, the present invention provides a wire on which a wire travels,
First and second focusing plates and a large number of mirror plates are arranged from the tip side thereof, and a large number of wires are passed through the focusing plate and the mirror plate to arrange these wires in parallel along the running line, and the first focusing plate is In the non-rotating state, each end plate is rotated in the same direction in this state, and the second focusing plate is rotated so as to be delayed by a half turn from the end plate, and each wire is moved to the tip side of the running line. In a method of manufacturing a cable by running a wire in a large pitch with a large pitch of twisting, the running line along which the wire is run is curved with a gentle curvature, and the first and second focusing lines are placed on the running line. A plate and each end plate are arranged, a wire supply mechanism is provided in the vicinity of the first focusing plate, wires are sequentially drawn from the wire supplying mechanism, and the drawn wire is pulled from the first focusing plate. The two focusing plates and each end plate are passed through and arranged in parallel, and in this state, while driving the second focusing plate and each end plate, each wire is run toward the tip side of the running line to manufacture a cable. It is a thing.

[0011]

Since the running line along which the wire is run is curved and the whole is bent, it is possible to manufacture the long cable in a space of a section shorter than the length of the cable to be obtained. Become. Then, a wire supply mechanism is provided in the vicinity of the first focusing plate, and a wire drawn from this wire feeding mechanism can be passed through each end plate starting from the first focusing plate, thus manufacturing cables of different lengths. Even in this case, the wire can be efficiently set on the focusing plate and the mirror 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 a symbol P is a traveling line for traveling a wire w, and the traveling line P is curved in a semicircular shape in the middle and is 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 front end side thereof at intervals of, for example, about 1 m.

As shown in FIG. 2 (A), the first focusing plate 1a has, for example, a split structure and has a circular focusing port 2 on its inner circumference. Are bound and the outer periphery is bound. Second focusing plate 1b
As shown in FIG. 2 (B), is formed into, for example, a three-divided structure, and the inner diameter of the focusing port 3 on the inner circumference is the first focusing plate 1a.
It is slightly larger than the inner diameter of the focusing port 2. As shown in FIG. 2C, each end plate 1c is provided with a large number of guide holes 4, for example, 421 for inserting the wire w.

The first focusing plate 1a is a frame (not shown).
The second focusing plate 1b and the end plates 1c arranged on the subsequent side of the second focusing plate 1b are rotatably supported by the frame. The second focusing plates 1b are rotated in the same direction at the same time, and the second focusing plates 1b are rotated in the same direction with a delay of a half rotation with respect to the rotation of the end plates 1c.
Further, each end plate 1c is adapted to be driven via a drive mechanism (not shown).

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

A wire supply mechanism 5 is provided in the vicinity of the first focusing plate 1a.
An endless carrier path 6 composed of rails is provided so as to be arranged at right angles to the wire holder 7, and a wire holder 7 such as a bobbin or a T carrier is movably mounted along the carrier path 6 for example 421.
Individually provided. A wire w having a diameter of 7 mm and a length of 400 m is wound around each wire holder 7.

In such a state, the wire w is pulled out from each wire holder 7 of the wire supply mechanism 5, and the focusing plates 1a, 1 for arranging the wire w on the most distal side of the traveling line P are provided.
From the focusing ports 2 and 3 of b, one by one is sequentially passed through the guide hole 4 of each end plate 1c on the subsequent side, and 421 wires w are supported on the traveling line P through the focusing plates 1a and 1b and each end plate 1c. And make them parallel.

Then, the tip of the wire w extending from the focusing port 2 of the first focusing plate 1a on the most distal side is fastened with a socket (not shown), and in this state, the second focusing is performed via a drive mechanism. While rotating the plate 1b and each end plate 1c at a low speed in the same direction, the wire w is pulled toward the tip of the running line P by a jack (not shown) to sequentially run, and the pull-out side is sequentially wound around the outer circumference of the winding frame 8. ..

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

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

From these relationships, the total length of this embodiment is 400 m.
When the magnitude of the pulling force and the torque in the case of the wire w is obtained, the straight line portion is 370 m and the bending portion is 30 m. Therefore, the pulling force (y) is y = (0.15 × 370) + 2.5 = 58.0 ( In 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 the value of the torque applied to the wire w in this embodiment is much smaller than the value of the torsional yield torque.

Therefore, each wire w is once twisted between the focusing plate 1a and the tip end plate 1c as it travels, but since the torque value is below the elastic limit, it does not cause plastic deformation. It only deforms elastically. Then, the twist applied to the wire w is sequentially sent out to the rear side of the wire w by its elastic force, and eventually the wire w is simply twisted elastically in a gentle spiral shape without being twisted in the axial direction. It becomes a state.

That is, in normal rope twisting,
As shown in FIG. 3 (A), the wire w itself is twisted until it is plastically deformed and twisted into a spiral shape. However, in the method of this embodiment, as shown in FIG. 3 (B), the wire w is twisted. The whole itself is elastically deformed into a spiral shape without being twisted, and a so-called belly-back twist state is formed.

Therefore, the cable manufactured by the method of the present invention maintains mechanical properties almost equal to those of a normal parallel wire cable. And since the whole cable is twisted at a large pitch, it does not cause a large deformation,
It can be relatively easily wound around the outer periphery of the bobbin 8.

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

Further, a wire supply mechanism 5 is provided near the first focusing plate 1a arranged on the most distal side of the traveling line P. Therefore, when a wire w of 400 m is set on the traveling line P, for example. Even if a wire w shorter than this, for example, 300 m, is set, there is an advantage that the common wire supply mechanism 5 can always be used to set efficiently without changing the supply position.

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

The outer circumference of the manufactured cable may be covered with a resin tape, and in the straight section P1 and P2 of the running line P, a number of pipes are laid between the end plates 1c. Wire w inserted through the guide hole 4
May be run through these pipes.

The radius R of curvature of the curved portion P3 of the traveling line P is R
The reason for setting ≧ 100d is that the wire w is R <100d.
This is because the wire w has a tendency to bend at this portion when traveling on the curved portion P3.

FIG. 6 shows a second embodiment of the present invention. In the second embodiment, the running line P along which the wire w is run is curved at a substantially right angle with a gentle curvature, and this running line is run. Focusing plates 1a and 1b and each end plate 1c are arranged along P. Even in such a state, by bending the traveling line P, the manufacturing can be performed in the space of 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 along which the wire is run is curved and the whole is bent, the long cable can be manufactured in a space of a section shorter than the length of the cable to be obtained. Since a wire supply mechanism is provided near the focusing plate of the above, even when manufacturing cables of different lengths, always pull out the wire from the common wire feeding mechanism and pass it from the focusing plate to each end plate. Therefore, there is an advantage that cables with different lengths can be efficiently manufactured.

[Brief description of drawings]

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

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

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

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

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

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

[Explanation of symbols]

 1a, 1b ... collecting side plate 1c ... end plate 5 ... wire supply mechanism w ... wire P ... running line

Claims (1)

[Claims] 1. A first and a second focusing plate and a large number of mirror plates are arranged from the tip side of the running line along which the wire is run, and a large number of wires are passed through the focusing plate and the end plate to pass the wires. Parallel to each other, hold the first focusing plate in a non-rotating state, rotate each end plate in the same direction in this state, and rotate the second focusing plate so that it is delayed by half a turn from the end plate. In the method of manufacturing a cable by causing each wire to run toward the tip side of the running line and adding a large pitch of twist to the entire wire, the running line running the wire is curved with a gentle curvature. Then, the first and second focusing plates and each end plate are arranged on the traveling line, a wire supply mechanism is provided in the vicinity of the first focusing plate, and the wires are sequentially drawn from the wire supply mechanism. The drawn wires are passed from the first focusing plate through the second focusing plate and each end plate to be arranged in parallel, and in this state, while driving the second focusing plate and each end plate, each wire is moved to the tip side of the traveling line. A method for manufacturing a cable, characterized in that the cable is manufactured by running toward a cable.