JPS5938479Y2 - Anti-corrosion coated long cable for suspended structures - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a long cable with anti-corrosion coating used in suspended structures such as cable-stayed bridges and suspended roofs.

Conventionally, this type of anti-corrosion coated long cable includes one with a painted surface, one with an extruded plastic coating, and one with a steel pipe or plastic covering the cable body and a cavity in which the anti-corrosion coating is injected and filled.

Among these cables, cables with only surface coating and plastic coating had incomplete anticorrosive effects and poor durability, making them unsuitable for practical use.

On the other hand, pipes with a double coating structure consisting of pipes and anti-corrosion materials have no problem in terms of anti-corrosion properties, but they have a fatal flaw: they do not require materials such as cement milk or cement mortar, which harden completely over time, as anti-corrosive materials. Even if the cable body and pipe are originally flexible (bendable) to the extent that they can be wound into a coil, the hardening of this anticorrosive material causes the cable to The flexibility of the main body and the pipe is lost, and the entire cable becomes a single rigid body that cannot be bent.

Therefore, since it is not possible to produce the cable in a factory and then roll it into a coil and transport it to the site, the process of injecting and filling the cable with anticorrosive material has always been necessary after the cable has been erected at the site.

To this end, there was no concept of manufacturing long double-coated cables for suspended structures in a factory, and it was common sense to construct them on-site and perform anti-corrosion treatment on-site.

As a result, it was extremely disadvantageous in terms of construction cost and construction period.

As shown in Japanese Patent Application Laid-Open No. 48-36444, it is known that a foamable anticorrosive coating composition is used as an anticorrosive layer to impart elasticity to the anticorrosive layer.

However, the purpose of this cable is to increase its shock absorption ability, and although it can exhibit flexibility as a whole, the flexibility of the cable is limited by the impact load applied to the cable. This refers to the degree of deformation tolerance that is characteristic in comparison with conventional rigid cables, in which the cables are flexibly deformed to absorb or relieve loads. This is a far cry from 1, which is transported by hand.

Nor is there any such recognition.

This invention breaks away from the old fixed idea of on-site construction and on-site anti-corrosion treatment, and is based on a completely new concept of factory production and on-site transportation.While maintaining sufficient anti-corrosion effects, the entire structure can be folded into a coil shape. It is an object of the present invention to provide a long cable with anti-corrosion coating for use in suspended structures that can be bent.

The feature of this invention is that the suspension structure is constructed by covering the cable body with a pipe having an inner diameter larger than the outer diameter of the cable body, and injecting anti-corrosion into the gap between the two. For long cables with anti-corrosion coating for commercial purposes, the cable main body and the pipe have flexibility to the extent that they can be individually wound into a coil, and the anti-corrosion material is time-curable and in a hardened state. The present invention relates to a long anticorrosive coated cable for suspended structures having a hardness of 50 or less on the Shore hardness, which is sufficient to maintain flexibility to the extent that the cable body and pipe can be wound into a coil shape.

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

Reference numeral 1 denotes a long cable main body, which has fixing fittings 2゜2 at both ends.A long pipe 3 having an inner diameter larger than the outer diameter of the main body 1 is covered over the entire length of the main body 1. Main body 1
By injecting and filling the cavity 4 between the pipe 3 and the pipe 3 with the corrosion-proofing material 5 described below, a corrosion-proof coated long cable for a suspended structure having a double corrosion-proofing layer is constructed.

The cable main body 1 and the pipe 3 each have flexibility (bendability) to the extent that they can be individually wound into a coil shape.

Therefore, when the cable body 1 is covered with the pipe 3 in a single layer, both cables 1 and 3 can be freely wound into a coil.

Therefore, the anticorrosion 5 injected into the gap 4 between the main body 1 and the pipe 3 is not only chemically stable and impervious to water, but also (a) facilitates injection work and is long in size. It has high initial fluidity so that it can be applied quickly over the entire length of the cable, (b) it has a time-curing property so that it does not leak out in the event of a pipe breakage, and (c) it has sufficient properties to allow it to harden. A material that can exhibit flexibility, that is, the cable body 1 button and the pipe 3 are originally fabrics, and after curing, the material is peeled off to a degree that does not impair its flexibility to the extent that it can be wound individually into a coil shape. I use what I have available.

Specifically, synthetic resins such as epoxy resins, butyl rubber, polybutadiene, and tar epoxy, with a viscosity of 1000 cp or less during injection and a viscosity of 1 million cp after curing.
Use an anticorrosive material having a hardness of 50 or more on the Shore hardness after curing.

On the other hand, the highly flexible long pipe 3 is made of plastic such as polyethylene, vinyl, or rubber.

In this way, the cable main body 1 and the pipe 3 each have flexibility to the extent that they can be individually wound into a coil.
The cavity 4 is filled with an anticorrosive material 5 having a Shore hardness of 50 or less and having flexibility that does not impair the flexibility (bendability) of the main body 1 and the pipe 3 even if peeled after hardening. When using this anti-corrosion coated long cable for hanging structures with a heavy anti-corrosion layer formed, the cable main body 1 is peeled off during cable winding, causing relative movement of a large number of strands constituting the cable main body 1, and unraveling of the cable main body 1. Since both the overall bendability and the free bendability of the pipe 3 relative to the main body 1 are not inhibited by the anti-corrosion 5, the cable as a whole has sufficient bendability and can be bent into a coil shape. , it exhibits completely new properties unimaginable from conventional cables.

To explain the relationship between the bendability of the entire cable and the corrosion protection 5, first, in order to bend the cable body 1 into a coil shape, it is necessary to absorb the difference in the circumference of each strand caused by the bending. The scales each strand moves relative to each other,
Conversely, it is necessary that the relative movement of this wire is not restricted.

Here, to explain in detail the relative motion of this strand, 1.
When the cable body 1 is formed of a parallel bundle of wire strands, when the parallel strand bundle 1 is wound onto its 11 reels 6 as shown in FIG. The hail spreads like a cobra between the sheathing parts 7, 7 for preventing break-up.

FIG. 4 shows this as seen from the side, and FIGS. 5 to 7 show the cross-sectional shapes of the sheathing portion and the flooring portion, respectively.

Furthermore, when the bundle of parallel strands 1 is twisted and wound in advance to prevent it from coming loose, as shown in FIG. The marking portion 8 that was previously moved in a diagonal line shape in the winding state.

On the other hand, in order to bend the pipe 3, it is necessary that the free deformation inherent in the pipe 3 itself is not restricted.

However, if the hardness of the anticorrosion 5 after curing is too high (Shore hardness exceeds 50), (4) in the cable body 1, the movement of each strand is restricted by the hard anticorrosion 5 that has penetrated between the strands, Relative movement between the strands is no longer performed.

As a result, each strand becomes integrated, and the cable main body 1 becomes like a single steel rod, resulting in extremely poor bendability.

(B) The pipe 3 is also protected by the cable body 1 due to the anti-corrosion 5.
The original free deformation of the pipe is restrained.

(4) (Depending on the season, although the cable body 1 and the pipe 3 could originally be bent into a coil shape by themselves, by injecting and filling the cable with the anticorrosive material 5, the cable as a whole could be folded into a coil shape.) It became impossible to bend 1
○ In order to avoid the situations (4) and (B) above, the present invention has been designed to allow each strand of the cable body 1 to freely move without being restrained by the anti-corrosion 5. As the hardness of the anticorrosive material 5 which can be moved and which does not restrict the free deformation of the pipe 3, a Shore hardness value of 50 or less is obtained from a wide range of hardness, thereby preventing bending of the entire cable. ensuring its properties and winding it into a coil,
In other words, it was possible to produce the cable in a factory, wind it into a coil, and transport it locally.

In addition, regarding the characteristic of the anticorrosive material 5 that the viscosity at the time of injection is 1000 cp or less, the purpose of this characteristic is, firstly,
The object is to reduce the injection resistance so that the injection work can be performed easily.

If you use a corrosion protection material that hardens in about 5 minutes as shown in the above-mentioned Japanese Patent Application Laid-open No. 48-36444 on a long cable like this, the injected corrosion protection will cause the cable to break down. Because it hardens and breaks off in a small portion of its total length, the injection process requires a great deal of time and effort.

Therefore, in practice, there is no point in using the long pipe 3 or producing the cable in a factory.

Therefore, as mentioned above, by using the corrosion protection material 5 with a viscosity of 1000 cp or less during injection, it is possible to achieve high initial fluidity (injection speed) and sufficient hardening to inject the corrosion protection material over a long distance at once. This allows time to be secured, making it practically possible to efficiently produce long cables in a factory.

Incidentally, a single continuous pipe may be used as the pipe 3, but if a pipe having the structure shown in FIG. 1 is adopted, it is advantageous in terms of durability and the like.

That is, the pipe 3 is divided into three parts in the length direction, and each pipe 31, 32, 33 is fitted onto the cable body 1,
Of these, the pipes 31 and 33 on both sides are fixed to the fixing fittings 2 and 2, and the joint portions of the vias 31 to 33 are covered with sleeves 34 and 34 that are slidable in the length direction.

35... is a sealing member.

When the pipe 3 is configured in this way, the cable body 1
When the pipe 3 is tensed and the anticorrosive material 5 is injected and filled into the cavity 4, the tensioning force is not transmitted over the entire length of the pipe.

Therefore, there is no need for the pipe itself to be stretched, which is advantageous in terms of the durability of the pipe 3, or in other words, the corrosion resistance of the cable.

In addition, each split pipe 31.3 caused by the tensile force
Since the gap between the sleeves 34 and 33 is reliably closed by the sleeves 34 and 34, there is no possibility that the anticorrosive material 5 will leak.

As described above, the present invention is suitable for long cables with anti-corrosion coating for suspended structures with a double anti-corrosion structure, which is constructed by covering the cable body with a pipe and injecting anti-corrosion into the gap between the two. Therefore, the cable body and pipe have sufficient flexibility (
Under the prerequisite that the cable body has bendability (relative movement between strands) and deformability of the button and pipe, the hardness after curing is less than 50 Shore hardness. By using a corrosion-proofing material that has a corrosion-resistant material, it is possible to wind the entire cable into a coil.

Therefore, the cable of the present invention can be produced in a factory, wound into a coil, and transported to the site, which is very advantageous in terms of construction costs and construction period at the site.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway longitudinal sectional side view showing an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional front view of the same, and Fig. 3 shows a case in which the cable body is formed of a parallel bundle of strands and is wound on a reel. A plan view for explaining the relative movement of each strand during removal,
Fig. 4 is a side view of the same side, Fig. 5 is a cross-sectional view taken along the line V-■ of Fig. 4, Fig. 6 is a cross-sectional view taken along the line VI-VI of Fig. 4, Fig. 7 is a sectional view taken along the line FIG. 7 is a plan view for explaining the relative movement of each strand when the wire bundle is twisted and wound in advance. 1... Cable body, 3... Highly flexible pie 4.
...Void portion, 5...Anti-corrosion. centre,

Claims (1)

[Scope of utility model registration request] A long cable with anti-corrosion coating for a suspended structure, which is constructed by covering a cable body with a pipe having an inner diameter larger than the outer diameter of the main body, and injecting and filling the gap between the two with anti-corrosion. The cable main body and the pipe each have flexibility to the extent that they can be individually wound into a coil shape, and the corrosion protection material is time-hardening and cures in a hardened state. 1. A long cable coated with anti-corrosion coating for a suspended structure, characterized in that it has a Shore hardness of 50 or less, which is sufficient hardness to maintain flexibility enough to be wound into a coil.