JPH0674554B2 - Search - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a rope used as a cable for a suspension bridge, for example.

[Technical Background of the Invention and Problems] Locked coil ropes and spiral ropes have been conventionally used as cables for suspension bridges.
Large bridges such as strait crossing bridges have emerged, and in such cases parallel cable (PWS) is often adopted. The parallel cable is a bundle of many wires that are aligned in parallel and bundled, and has the advantages of high cutting load strength and low elastic modulus.

And such a parallel wire cable is wound around the winding frame and conveyed to the construction site of the suspension bridge, but since the wires are aligned in parallel, the focusing shape when wound around the winding frame is There is a problem that it is difficult to wrap it properly and it takes a lot of trouble.

Therefore, it is conceivable to twist each wire into a rope structure, but when twisting each wire into a rope structure in this way, each wire is twisted in the axial direction and plastic deformation occurs, As a result, the cutting load strength as a rope is reduced and the elastic modulus is also increased, which makes it difficult to apply the cable to a suspension bridge cable.

[Object of the Invention] The present invention has been made by paying attention to such a point, and an object of the present invention is to maintain a cutting load strength almost equal to that of a parallel wire cable and to apply the same to a reel. An object is to provide a rope body that can be easily and efficiently wound.

[Summary of the Invention] In order to achieve such an object of the present invention, a large number of wires are aligned in parallel to form a cable, and one end side and the other end side peripheral surface of the cable are constrained, and the one end side is bound. And the other end of the cable are rotated in opposite directions to each other, so that the entire cable is twisted in abdominal spin at a large pitch with a twist angle of about 3.3 °, and a resin tape is wrapped around the outer circumference to cover the cable. It was done like this.

In such a configuration, the entire cable is twisted at a large pitch, but each wire is not twisted in the direction around its axis and is simply kept elastically deformed into a gentle spiral, and The mechanical properties almost equivalent to those of the parallel cable are maintained.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.

First of all, wire 4 with galvanized wire 1 with a diameter of 7 mm
21 cables are arranged in parallel to form a cable 2 having a substantially circular cross section as shown in FIG. The inscribed circle diameter of the cross section is 155 mm.

Then, as shown in FIG. 1, this cable 2 is
It is passed through the second and third focusing plates 3, 4 while traveling at a constant speed, and is further wound around the winding frame 8 through the first and second tape winding machines 6 and 7. In addition, 9 is a delivery roller.

The focusing plates 3, 4, 5 are arranged at equal intervals so as to face each other, and the cable 2 is inserted through these focusing plates 3, 4, 5 to constrain the peripheral surface thereof. Then, the first focusing plate 3 is not rotated, the second focusing plate 4 is 1/2 rotation, and the third focusing plate 5 is 1 rotation, so that the cable 2 is rotated at a low speed in the same direction as the cable 2 travels. That is, the one end side and the other end side of the cable 2 are relatively rotated in the opposite directions while the peripheral surfaces of the one end side and the other end side are restrained. Therefore, the entire cable 2 has a large pitch, for example, a pitch of about 8m (converted into a twist angle of 3.3m).
However, each wire 1 is not twisted in the direction around its axis but is elastically deformed into a gentle spiral shape.

After the large twist is applied to the entire cable 2 in this manner, the cable 2 is introduced into the first tape winding machine 6 through the feeding rollers 9 and 9. This tape winding machine 6
As shown in FIG. 2, a rotary cylinder 11 is rotatably supported via a support cylinder 10, and arms 12, 12 are provided on the outer peripheral surface of the rotary cylinder 11 in opposite directions. The reels 13 and 13 are rotatably attached to the tips of the and 12, respectively. Then, the binding resin tapes 14, 14 are housed in the reels 13, 13. The cable 2 is inserted through the insides of the support cylinder 10 and the rotary cylinder 11, and the binding resin tapes 14, 14 drawn from the reels 13, 13 are connected to the peripheral surface of the cable 2. Then, in this state, the cable 2 travels and the rotary cylinder 11 rotates, so that the resin tape 14, 1 is attached to the peripheral surface of the cable 2.
4 are spirally wound while crossing each other. A brake mechanism (not shown) is provided at the mounting portion of the reels 13 and 13 to apply appropriate braking to the rotation operation of the reels 13 and 13, and therefore the resin tapes 14 and 14 are appropriately tensioned to prevent the cable 2 from being damaged. Wraps tightly around the surface. Each of the resin tapes 14 and 14 is wrapped around the peripheral surface of the cable 2 in a so-called gaiter winding state while the side edges of the respective resin tapes 14 and 14 are superposed on each other. Covered by tapes 14,14.

After this, the cable 2 is introduced into the second tape winding machine 7 via the feed rollers 9, 9. The second tape winding machine 7 has the same structure as the first tape winding machine 6,
The only difference is that the reels 13 and 13 have anticorrosion resin tapes 15 and 15, respectively.
Is only accommodated. Then, these resin tapes 15 and 15 are wound around the outer circumferences of the binding tapes 14 and 14 which are already wound as the cable 2 travels, as described above.

After the binding and anticorrosion resin tapes 14 and 15 are thus wound, the cable 2 is sequentially wound around the winding frame 8 through the feeding rollers 9 and 9. A large pitch of twist is added to the whole of the cable 2 in advance, so that when the cable 2 is wound around the winding frame 8, the cable 2 hardly deforms and the winding operation is facilitated. It can be performed efficiently, and it is possible to prevent a strong pressure from being applied to the coating on the outer periphery thereof, that is, the resin tapes 14 and 15 to avoid the damage.

The cable 2 wound around the bobbin 8 is transported to the construction site of the suspension bridge in this state, pulled out from the bobbin 8 and used for a predetermined purpose. The outer circumference of the cable 2 is covered with resin tapes 14 and 15,
Moreover, since the resin tapes 14 and 15 are in close contact with the cable 2, it is possible to maintain high corrosion resistance without any additional anticorrosion treatment at the construction site.

Depending on the usage environment of the cable 2, resin tape 14,1
When winding 5, the polymerized portion of its side edges are heat-sealed, or after the resin tape 15 is wound, the outer periphery thereof is further coated with a resin by an extruder,
Further, as shown in FIG. 4, a resin sheet 19 may be attached to the outer circumference of the cable 2. Explaining the resin sheet attaching means shown in FIG. 4, a plurality of guide bodies 20a, 20b, 20c, 20d are arranged at a predetermined interval from each other, and these guide bodies 20a ... Are ring-shaped and a part thereof is notched. The cable 2 is inserted inside the guide bodies 20a ... These guide bodies 20a, ... Are gradually smaller in inner diameter and notch spacing in the running direction of the cable 2, and the heat-shrinkable resin sheet 19 is inserted from the inside of the guide body 20a having the largest diameter. Run with the cable 2,
Both edges are sequentially brought close to each other and finally welded by a welder 21, and the entire resin sheet 19 is heat-shrinked to enclose the outer periphery of the cable 2.

Here, 421 galvanized 7mm diameter wires,
After bundling them in parallel and bundling them, they are twisted at a pitch of 8 m to make a cable with a total length of 100 m, and a cable for binding and a resin for corrosion protection are wrapped around the outer circumference of this cable. Tape and anticorrosion resin tape wrapped around it, with resin coating on the outer periphery with an extruder, wrapping resin band for binding and anticorrosion resin tape, and then wrapping the outer periphery with a heat-shrinkable resin sheet for heat shrinkage. The cutting load strength and elastic modulus were measured.The cutting load strength was 2641ton, the elastic modulus was 20600kg / mm ² , the same was 2648ton, 20600kg / mm ² , and the same 2650to.
It was n, 20600 kg / mm ² .

The same number of wires as the above-mentioned cable, in the same number of parallel wires that are aligned in parallel and bundled, the cutting load strength is 2674 tons, and the elastic modulus is 20500 kg / mm ² .
It can be seen that the above-mentioned and, maintain mechanical properties almost equal to this.

That is, the cable according to the present invention is only twisted at a large pitch as a whole, and each wire forming the cable is not twisted in the direction around the axis and does not cause plastic deformation. It maintains substantially the same mechanical properties.

Further, the above cables were once wound around a reel having a body diameter of 2500 mm, left for 24 hours and then pulled out to investigate the linearity and the presence or absence of shape deformation, but none of them had any problem. The above-mentioned measurement of mechanical properties was conducted after this investigation.

The rope according to the present invention can be used not only for a suspension bridge but also as a supporting member for a suspended structure or a tension member in civil engineering work.

[Effects of the Invention] As described above, according to the present invention, there is an effect that it is possible to easily and efficiently wind around a bobbin and to maintain mechanical characteristics substantially equivalent to those of a parallel wire cable.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a process drawing of a rope body, Fig. 2 is a side view of a tape winding machine, Fig. 3 is a sectional view of a cable, and Fig. 4 is a resin sheet cover. It is a figure explaining a wearing means. 1 ... wire, 2 ... cable, 14,15 ... resin tape.

Claims (1)

[Claims] 1. A cable in which a plurality of wires are aligned in parallel to form a cable, and the circumferential surfaces of the one end side and the other end side of the cable are constrained to rotate the one end side and the other end side in relatively opposite directions. By doing so, twisting with a large pitch with a twist angle of approximately 3.3 ° is added to the whole of the cable, and a cable is wrapped around the outer circumference to cover the cable.