JPS6075694A - Cable body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cable used, for example, as a cable for a suspension bridge.

[Technical background of the invention and its problems]

Locked coil ropes and spiral ropes have traditionally been used as cables for suspension bridges, but in recent years,
Large bridges such as channel crossing bridges are emerging, and parallel wire cables (PWS) are often used in such structures. Parallel wire cable is made up of a large number of wires drawn in parallel and bundled together, and has the advantages of high cutting load strength and low elastic modulus.

By the way, since cables for suspension bridges constitute a part of a permanent structure, they are required to have high corrosion resistance.For this reason, when parallel wire cables are used, they are constructed of galvanized wire, and 2 after installation
It is common practice to wrap a wire called a tupping wire tightly around the entire length of the cable in a spiral manner, and then apply anti-corrosion paint thereon. However, since this type of cable is required to have a breaking load strength of 1000 tons or more, its smoke and weight are quite large, and therefore, applying corrosion protection treatment on site after being strung as described above requires a great deal of labor and expense. It will cost you.

Therefore, the wires are sometimes bundled to form a parallel wire cable, and then the cable is passed through a corrosion-resistant resin pipe, wound around a winding frame, and transported to the site and stretched. However, in this case, when the parallel wire cable is wound around a winding frame, its cross section is flattened and large, so a resin pipe with a correspondingly large diameter must be used. In other words, if you use a resin/main tube with a diameter that is approximately the same as the normal cross-sectional diameter of a parallel cable, when the cable deforms into a flattened shape and the cross section expands, the resin tube or tube will be damaged by the pressure. This is because there is a risk. However, if a resin pipe with a large diameter is used in advance, when the cable is pulled out from the winding frame and stretched, the cable will restore its normal cross section, creating a gap between the outer circumference and the resin pipe. The material must be filled, and this operation must be carried out on-site, thus again involving a laborious and expensive operation.

[Purpose of the invention]

The present invention has been made with attention to these points, and its purpose is to provide excellent corrosion resistance in advance at the production factory without carrying out troublesome treatment on site, and to provide parallel wire cables with excellent corrosion resistance. The purpose is to provide a cord body that can be used with almost the same characteristics.

[Summary of the invention]

In the present invention, a cable is constructed by aligning a large number of wires in parallel, and the entire cable is twisted at a large pitch, and a corrosion-resistant tape is sequentially and tightly wrapped around the outer circumference to cover the entire surface of the cable. This is what I did.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. First, 421 galvanized wires 1 having a diameter of, for example, 7W+ are arranged in parallel to form a cable 2 having a substantially circular cross section as shown in FIG. Note that the inscribed circle diameter of the cross section is 155th scale. And this cable 2
As shown in FIG. 1, the first, second and third focusing plates 3.4
．． 5 while running at a constant speed, and then wound onto a reel 8 through first and second tape winding machines 6.7.

Note that 9... is a delivery roller. Focusing plate 3.4
．． 5 are arranged at equal intervals to restrain the surface of the cable 2, and the ratio is such that the first focusing plate 3 does not rotate, the second focusing plate 4 makes 1/2 rotation, and the third focusing plate 5 makes one rotation. As the cable 2 travels, it rotates at a low speed, so that while the cable 2 passes through each converging plate 3.4.5, the entire section is twisted at a large pitch, for example, at any pitch of 8 m. After being twisted, the cable 2 is passed through the feed rollers 9, 9.
The tape is then introduced into the first tape winding machine 6. As shown in FIG. 2, this tape winding machine 6 rotatably supports a rotary tube 11 via a support tube 10, and arms 12 and 12 are provided on the outer peripheral surface of the rotary tube 11 to protrude in opposite directions. Reels 13.13 are rotatably attached to the ends of these arms 12.22. A binding resin tube 14.14 is housed in the reel 13.13. The cable 2 is inserted through the inside of the support tube J (7 and the rotary tube 1), and a binding resin tape 14.14 drawn from the name 3.13 is connected to the circumferential surface of the cable 2. In this state, the cable 2 runs and the rotary tube JJ rotates.
As a result, the resin cheek 7c114.1 is formed on the circumferential surface of the cable 2.
4 are spirally wound while crossing each other. The mounting portion of the reel 13.13 has a brake mechanism (not shown) that applies appropriate braking to the rotational movement of the reel 13.13.
is provided, so that the resin tape 14.14 wraps tightly around the curved surface of the cable 2 with appropriate tension. Each resin tube J 4 , 14 is wound around the circumferential surface of the cable 2 in a so-called r-torl winding state, with its side edges superimposed on the side edges of the preceding portion of the tube, and thus the circumferential surface of the cable 2 is Make sure that each part is made of resin 14.14
covered by.

After this, the cable 2 passes through the feed-out row 29.9 to the second
is introduced into the tape winding machine 7 of. This second tape winding machine 7 has the same structure as the first tape winding machine 6, the only difference being that a corrosion-resistant resin chip 7"15.15 is added to the Lee /I/13.13. The only difference is that it is contained.

And these resin chive J5. J5 is the above-mentioned binding tape 1 which has already been wrapped as the cable 20 runs as described above.
4. It is wrapped around the outer circumference of 14.

In this way, resin tape for binding and corrosion protection J41J5
After the cable 2 is wrapped around the
9 and is sequentially wound onto a reel 8.

Cable 2 has been given a lot of love in its entirety9,
Therefore, even when wound around the winding frame 8, unlike general parallel wire cables, the cross section does not deform into a flat shape.
Therefore, its outer periphery is covered with resin tape 14.1
5 will not be damaged due to strong pressure being applied to it. The cable 2 wound around the winding frame 8 is transported to the site in that state, pulled out from the winding frame 8, and used for a predetermined purpose. The outer periphery of the cable 2 is covered with a resin pipe 7"14°15, and since the resin pipe 14.15 is in close contact with the cable 2, corrosion can be avoided without requiring any separate anti-corrosion treatment at the site. Corrosion resistance can be maintained.Furthermore, the outer periphery of the cable 2 is securely restrained by the resin tube 14915, so that the cable 2 is not carelessly deformed when being pulled out from the winding frame 8, and is therefore easy to handle. Furthermore, since the resin tapes 14 and 15 are in close contact with the cable 2, the overall diameter does not become unnecessarily large.

By the way, depending on the usage environmental conditions of the cable 2, when wrapping the resin tape 14 and 15, the overlapping portions of the side edges may be heat fused, or after the resin tape 15 is wrapped, the outer periphery may be further wrapped. The extruder may be coated with a resin, or the outer periphery of the cable 2 may be covered with a resin sheet 19 as shown in FIG. To explain the means shown in FIG. 4, there are a plurality of side bodies 20a, 2. Ob, 2
0c and 20d are arranged, and these guide bodies 20h... are ring-shaped with a part cut out, and the cable 2 is inserted and runs inside these guide bodies 20... ing. And these guide bodies 20 &...
・The inner diameter and the interval between the notches become smaller in the running direction of the cable 2, and the heat-shrinkable resin sheet 19 is inserted from inside the guide body 20&, which has the largest diameter, and is integrated with the cable 2. The resin sheet 19 is caused to travel along the length of the cable, and its edges are brought closer to each other in sequence, and finally welded by a welder 21, and the entire resin sheet 19 is heated and shrunk to cover the outer periphery of the cable 2.

I am currently using 471 galvanized wires with a diameter of 7m+.
After pulling the books parallel to each other and bundling them together, 1) twist the whole cable at a pitch of 8 m to make a cable with a total length of 100 m, and wrap a resin cable for binding and a resin cable for corrosion protection around the outer circumference of the cable. ■ Wrap resin tape for binding and resin tape for corrosion protection, and apply resin coating to the outer periphery using an extruder. ■ Wrap resin tape for binding and resin tape for corrosion protection, and then wrap the outer periphery with a heat-shrinkable resin sheet. When the cutting load strength and elastic modulus of these were measured, the cutting load strength of ■ was 2641 to
n, the elastic modulus is 20600kg/W2゛ Similarly ■ is 26
48ton, 20600kg/m, also ■ is 265
0ton, 20600)9/w+2.

A normal parallel wire cable made of the same number of wires as the above cable, aligned in parallel and bundled, has a cutting load strength of 2674 tons.

The elastic modulus is 20500 and 9/m2, and the above ■ and ■.

It can be said that sample (■) maintains almost the same mechanical properties as this. In other words, when a cable is twisted, the cutting load strength decreases and the elastic modulus increases, but the twisting pitch is kept at a large value of 8 m, so there is almost no effect from the twisting. It is comparable to ordinary parallel cables and can be handled with almost the same characteristics.

In addition, the cables of ■, ■, and ■ above were wound into a -H shape on a winding frame with a body diameter of 2500 mm, and after being left for 24 hours, they were pulled out and examined for linearity and deformation, but none of them were found. There were no problems. Note that the above-mentioned measurements of mechanical properties were performed after this investigation.

In the above embodiment, after twisting the entire cable 2, the binding resin tape 5f is first applied to the outer periphery of the cable 2.
After that, a corrosion-preventing resin, Chiagua, is wrapped around the outer circumference of the cable. However, the above-mentioned binding resin tape 6 is provided for the purpose of reinforcing the binding of the cable 2, and the corrosion-preventing resin tape 7 is used to wrap the cable. In cases where the cables 2 can be sufficiently bundled, the wrapping of the binding resin can be omitted. In addition, as a corrosion-resistant tape,
It is not limited to being made of resin, but may be made of rubber or the like. Furthermore, the cable body according to the present invention can be used not only for suspension bridges, but also as a support member for a suspended structure building, a tension member in civil engineering work, and the like.

〔Effect of the invention〕

As explained above, according to the present invention, there is no need to perform troublesome anti-corrosion treatment on the cable at the site where the cable is used, unlike in the past, and sufficient corrosion resistance can be imparted in advance at the production factory. It has the advantage that it can be handled while maintaining all the mechanical properties equivalent to ordinary parallel cables.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a production process diagram;
FIG. 2 is a side view of the tape winding machine, FIG. 3 is a sectional view of the cable, and FIG. 4 is a diagram illustrating the resin sheet application means. 1...Wire, 2...Cable, 14.15...
resin tape. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] Cable metal is constructed by aligning many wires in parallel,
This cable is made by twisting the entire cable at a large pitch, and then wrapping the entire length of the cable tightly with anti-corrosion tape to cover the entire surface of the cable.