JP2002322612A - Intersecting part structure of high-strength fiber composite material cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intersecting part structure of a cable structure capable of covering local shearing force in the diametral direction, a flaw of the surface and the properties of weakness in bending at a very small curvature of high- strength fiber composite material, and surely restricting sliding caused in the intersecting part, and having long life and reduced dead load by making the best use of advantages of the high-strength fiber composite material cable. SOLUTION: This intersecting part structure is provided with a cylindrical casing surrounding a cable body formed of the high-strength fiber composite material and having another cable end connected to the outside, and a fixing expansible material for integrating the casing with the cable body with expansion pressure filled in the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross structure of a high-strength fiber composite cable used as a cable structure.

[0002]

2. Description of the Related Art In suspension bridges, a cable structure is used as a means for supporting the load of an object such as a girder. In such a cable structure, the main cable and the hanger band are connected in an intersecting manner. In the cable net structure, the cables constituting the net are connected in an intersecting manner.

Conventionally, as a cable of such a cable structure, a wire rope is generally used, and one of the cables is directly grasped at a crossing portion of the cable by using a split intersection metal fitting, and is attached to a free end of the intersection metal fitting. The other cable is connected, or the cable is gripped by two intersection metal fittings, and the intersection metal fittings are overlapped and connected with bolts and nuts.

[0004]

However, when a wire rope is used as a cable, the cable itself is heavy, and there is a problem in corrosion resistance and tensile fatigue. From this point, instead of wire rope, the cable is made of a high-strength fiber composite material, and its high strength, low elongation characteristics, light weight, high corrosion resistance, and high tensile fatigue resistance are used for cable structures. Attempts have been made to extend the lifespan and reduce its own weight.

[0005] However, the high-strength fiber composite cable has characteristics that are weak against local shearing force in the diameter direction, surface scratches, bending at a minute curvature, and the like. For this reason, if the cable is directly grasped by using the intersection metal fitting similar to the wire rope, the following problem occurs.

[0006] The stress concentrates on a local portion of the cable due to the lateral pressure, causing a shear failure to lower the strength or break the cable. The sliding force generated at the intersection breaks the surface structure of the cable at the point of contact with the metal fittings, causing slippage, and also reducing the strength. Since the intersection portion usually bends, bending of the cable occurs at the intersection fitting mouth. Depending on the material of a high-strength fiber composite material cable, electrolytic corrosion occurs due to metal contact.

The present invention has been made in order to solve the above-mentioned problems, and has an object to be weak to local shearing force in the diameter direction, surface damage, bending at a minute curvature, and the like. Provided is an intersection structure of a cable structure having a long life and a reduced weight by taking advantage of the use of a high-strength fiber composite material cable, which can reliably restrain the sliding generated at the intersection while covering the characteristics. It is in.

[0008]

In order to achieve the above object, a cross structure of a high-strength fiber composite cable according to the present invention has a cable body made of a high-strength fiber composite material and another cable end connected to the outside. It is characterized by comprising a cylindrical casing, and a fixing expansion material which is filled in the casing and integrates the casing and the cable body by an expansion pressure.

Further, the cross structure of the high-strength fiber composite material cable according to the present invention comprises at least two sets of two-piece casings surrounding a cable body made of a high-strength fiber composite material, and each casing is filled with an expansion pressure. It is characterized by comprising a casing and an expansion material for fixing in which a cable body is integrated, wherein the two-part casing is connected in an intersecting manner. It is preferable that the casing has a buffer member inside both ends.

[0010] In the present invention, the "cable body" includes a case where it is composed of a strand, a case where it is composed of a cable in which a plurality of strands are assembled, and a case where it is a bundled cable in which a plurality of the cables are assembled. .

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a first embodiment of the intersection structure according to the present invention. This embodiment is of a T-shaped crossing type, and a typical application example is a hanger band of a suspension bridge as shown in FIG. In FIG. 4, a
Is a tower body, b is an abutment, and c is a cable made of a high-strength fiber composite material, and is erected from the abutment b via a top saddle a ′ of the tower body a. d is a digit and the cable c
And is hung by a hanger rope e connected via an intersecting portion structure A of the present invention.

The intersection structure A according to the present invention will be described in detail.
Reference numeral 1 denotes a halved cylindrical casing made of metal such as steel, and has a flat joining portion 10, a semicircular tube-forming portion 11 and a flat connecting joining portion 12. The matching unit 1
0, 10 and the connecting mating parts 12, 12 are respectively superposed and united by being fastened with bolts and nuts.
Tunnel-shaped through holes are formed at 1 and 11. Another cable 3 ′ is connected to the joining portion 12. The cable 3 'may in this case be a wire rope. One of the tube forming portions 11 of the split tubular casing 1 has an injecting portion 1 for an inflation material for fixing described later.
10 and an exhaust unit 111 are provided.

A cushioning member 4 divided into two parts in the circumferential direction is attached to the inside of both ends of the tube forming portions 11 and 11 by bonding or the like so as to form a ring when the tube forming portions 11 and 11 are combined. ing. The cushioning member 4 is made of a nonmetal such as M
Made of hard plastic such as C nylon, Fig. 2
As shown in (a), an opening 40 having a curvature is formed at the end so that the diameter increases outward.

Reference numeral 3 denotes a cable body, such as ultrahigh molecular weight polyethylene, wholly aromatic polyaramid fiber, wholly aromatic polyester fiber, having a strength of at least 20 g / d and an elastic modulus of 500 g.
Spiral twist type, braided type, or parallel aligned type made using high-strength, high-modulus fibers of / d or more are used, such as impregnating with resin or coating the outer layer. It is compounded. In this example, the cable body 3 is composed of a plurality (four in the drawing) of bundled cables 3a.
Are arranged in parallel. Each of the bundled cables 3a is an aggregate 3 of high-strength and high-modulus fibers.
00 (yarns, filaments, etc.) are twisted in a plurality (for example, seven), and a plurality of (seven in the drawing) strands 30a provided with a resin coating 301 such as polyethylene or polyester are arranged in parallel. I have.

In the cable body 3, the resin coating 301 is removed only in a region where the split tubular casing 1 is mounted, more precisely, in a range inside seal portions at both ends which will be described later. Are directly exposed.

A split tubular casing 1 is attached to the cable body 3 so as to surround the outer circumference in the radial direction. 5 is a cushioning member 4 inside both ends of the tube forming portions 11
This is a packing that fills a gap between the cable 3 and the cable 3.
The packing 5 is made of a hardening type resin clay such as an epoxy clay. When the cushioning member 4 is divided into two parts, the packing 5 is packed also in the contact gap between them.

Reference numeral 6 denotes a fixing expanding material filled in a tunnel-shaped through hole formed by the tube forming portions 11 and 11,
As a result, the tube forming portions 11, 11 and the cable 3 accommodated therein are integrated.

The expansion material 6 for fixing is a plastic material having the property of expanding upon solidification. A typical example is a mixture of an expansion material mixed with several types of expandable materials, pulverized and fired, and cement. can give. Examples include cement-blast furnace slag-bauxite-gypsum, cement-lime-
Gypsum type, calcium aluminate-lime-gypsum type and the like can be mentioned.

The expansion material 6 for fixing is mixed with a liquid such as water to form a liquid or slurry having a water / cement ratio of, for example, 20 to 30%.
0 is injected into a region defined by an end seal portion composed of the cushioning member 4 and the packing 5. The air in the region is exhausted from the exhaust unit 111. The expansion material 6 for fixing spreads over the surface of the exposed high-strength high-modulus fiber and every corner of the twisted valley due to its fluidity, and also fills the gap between the strands 30a. By curing in this state, the expansion material 6 for fixing expands at the time of solidification, whereby hydrostatic expansion pressure is generated in the tube-forming portions 11, 11, and the tube-forming portions 11, 11 and the cable 3 are expanded. Are firmly bound.

FIGS. 5 and 6 show a second embodiment of the intersection structure according to the present invention. This embodiment is of a cross-shaped type, and a typical application example is a cable net structure. In this embodiment, a plurality of sets (two sets in the drawing) of a split casing 1 ′, 1 ″ (hereinafter referred to as a split casing) having a disc shape or a block shape are used. Grooves 13, 13 which are sufficiently larger than the cross-sectional area of the cable 3 are formed on the mating surface of the halved disc-shaped casing 1 ′, 1 ″, and the grooves 13, 13 are combined to form a tunnel-shaped through hole. Is formed, and the main part of the cable body 3 is accommodated therein. In this embodiment, the cable body 3 comprises a bundled cable 3a in which a plurality of strands 30a (seven in the drawing) are arranged in parallel.

As shown in FIGS. 6 (a) and 6 (b), the grooves 13, 13 have enlarged portions 130, 130 formed at both ends via steps, and the buffer member 4 is disposed in this area, and Is filled with a packing 5 between itself and the cable body 3. The high strength and high elastic modulus fibers are exposed in a portion of the cable body 3 located inside the both end seal portions composed of the buffer member 4 and the packing 5.

On one half-plate-shaped casing 1 '(the lower side in the drawing), a plurality of through holes are provided at positions outside the grooves 13 and 13 through the plate thickness. The bolt-shaped casing 1 'is united and integrated by inserting a bolt 14 and screwing a nut.

The halved disc-shaped casing 1 'has a fitting groove 100 on the upper surface, and the other halved disc-shaped casing 1 "(upper side in the drawing) is fitted into the fitting groove 100. As shown in FIG. 6 (a), through-holes penetrate through the entire thickness in the area of the overlapping halved disk-shaped casings 1 'and 1 ". Are formed. Bolts 15 are inserted into these through holes, and nuts are screwed together to connect the split-panel casings 1 ′ and 1 ″ in a cross shape.

Each of the above-mentioned halved disc-shaped casings 1 ', 1 "
Although one of them is not shown, an injection part communicating with the groove 13 is provided, and the other one is provided with an exhaust part communicating to the outside. The tunnel-shaped through-hole is filled with a fixing expanding material 6, which adheres to the exposed high-strength high-modulus fiber, fills the through-hole, and expands during solidification in this state. Hydrostatic expansion pressure is generated in the halved disk-shaped casing 1 ', 1 ", and the halved disk-shaped casing 1', 1" and the cable bodies 3, 3 are firmly connected. Since the buffer member 4, the packing 5, and the expansion member 6 for fixing are the same as those in the first embodiment, the description thereof will be referred to.

In the embodiment, the halved disk-shaped casing 1 ', 1 "has two tiers (two sets). However, it is needless to say that the present invention is applicable to the case of three tiers (three sets) or more. In the first embodiment, the cable body 3 is composed of a plurality of bundled cables 3a, but it is needless to say that the cable body 3 may be composed of a single bundled cable 3a or a thicker strand 30a.

[0026]

In the first embodiment of the present invention, the fixing expanding material 6 is injected into the tube forming portions 11, 11 of the split tubular casing 1 attached so as to surround the cable body 3.
Since the cable body 3 is fixed by the frictional force generated by the expansion force due to the solidification, concentration of stress applied to the cable body can be avoided, and uniform pressure can be applied to the cable body 3.

Also in the second embodiment, the expansion materials 6 and 6 for fixing are injected into the tunnel-like through holes surrounding the cable bodies 3 and 3 of the split-panel casings 1 'and 1 "and solidified. Cable body 3,3 by frictional force generated by expansion force due to
Is fixed, stress concentration on the cable body can be avoided, and uniform pressure can be applied to the cable bodies 3 and 3. Therefore, it is possible to appropriately prevent the cable body composed of the high-strength high-modulus fibers from causing a shear failure due to the lateral pressure to lower the strength or to break.

Further, a strong frictional force is obtained by integrating the cable body 3 and the split tubular casing 1 or the split disc-shaped casings 1 ', 1 "by the expansion force of the expansion material 6 for fixing. Therefore, there is no fear that the surface structure of the cable is broken at the point of contact with the metal fittings due to the sliding force generated at the intersection and slipping occurs, that is, the sliding at the intersection is reliably performed without damaging the cable body 3. Can be restrained.

The through holes of the tube forming portions 11 and 11 of the halved cylindrical casing 1 and the through-holes of the halved disk-shaped casing 1 ′ and 1 ″ have buffer members 4 and 4 attached to both insides thereof. Since the openings of the buffer members 4 and 4 are opened with a curvature, even if the cable body 3 is bent in a direction perpendicular to the axial direction, the stress can be absorbed by the buffer members 4 and 4. The cable 3 can be prevented from being damaged by bending, and the cable 3 can be made of metal.
Split tubular casing 1 and split board casing 1 '
Since there is no direct contact with the cable 3, electrolytic corrosion of the cable 3 does not occur.

In operation, the cable 3 is covered from the side of the cable 3 in a state in which the split tubular casing 1 or the split disc-shaped casing 1 ', 1 "is separated. The packings 5 and 5 are attached and both ends are sealed, and in this state, the fixing expanding material 6 is injected into the inside of the halved cylindrical casing 1 or the halved disc-shaped casing 1 ', 1 ", and only curing is performed. Because it is good, it can be easily constructed on site.

[0031]

According to the first aspect of the present invention described above, a cylindrical casing 1 surrounding a cable body 3 made of a high-strength fiber composite material and having another cable end connected to the outside,
Since the fixing expansion member 6 is provided in the casing and the casing 1 and the cable body 3 are integrated by the expansion pressure, a local shearing force in the diameter direction of the high-strength fiber composite cable and surface damage are provided. Covers the characteristics that are vulnerable to bending at a minute curvature, and can reliably restrain the sliding that occurs at the intersection without damaging the cable body, thereby taking advantage of the use of the high-strength fiber composite cable. Thus, an excellent effect that a T-shaped cable crossing structure having a long life and a reduced own weight can be formed can be obtained.

According to the second aspect, at least two sets of split-plate-shaped casings 1 ', 1 "surrounding the cable body made of the high-strength fiber composite material, and the casings 1' filled in the respective casings by the expansion pressure. , 1 "and expansion members 6, 6 for fixing the cable bodies 3, 3 integrated with each other, and the halved disk-shaped casings 1 ', 1" are connected in an intersecting manner, so that high strength is obtained. Covers weak characteristics of fiber composite cable body against local shearing force in the diameter direction, surface damage, bending at minute curvature, etc., and reliably restrains sliding that occurs at intersections without damaging the cable body. As a result, the advantage of using a high-strength fiber composite cable can be obtained, and an excellent effect that a cable net structure having a long life and a reduced weight can be formed can be obtained.

According to the third aspect, the casings 1, 1 ',
1 "has buffer members 4 and 4 on both inner sides, so that it is possible not only to prevent the expansion material 6 for fixing from leaking out but also to prevent the expansion.
An excellent effect is obtained that even if the cable is bent, the damage caused by the bending can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of an intersection structure according to the present invention.

2A is a longitudinal sectional side view of FIG. 1, FIG. 2B is a partially enlarged view thereof, and FIG. 2C is an enlarged sectional view of a strand.

3A is a sectional view taken along line XX of FIG. 2, FIG.
FIG. 3 is a sectional view taken along the line YY in FIG. 2.

FIG. 4 is an explanatory diagram showing a usage example of the first mode.

FIG. 5 is a perspective view showing a second embodiment of the present invention.

6A is a cross-sectional view along a center line in FIG. 5, and FIG. 6B is a cross-sectional view along a ZZ line in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Split cylindrical casing 1 ', 1 "Split disk-shaped casing 3 Cable body 4 Buffer member 5 Packing 6 Fixing expansion material

Claims (3)

[Claims] A cylindrical casing surrounding a cable body made of a high-strength fiber composite material and having another cable end connected to the outside;
An intersecting structure of a high-strength fiber composite material cable, comprising: a fixing expansion material which is filled in a casing and integrates the casing and the cable body by an expansion pressure. 2. A casing comprising at least two sets of split casings surrounding a cable body made of a high-strength fiber composite material, and an expansion material for fixing wherein the casing and the cable body are integrated by an expansion pressure and filled in each casing. A crossing structure of the high-strength fiber composite material cable, wherein the split casings are connected in a crossing manner. 3. The crossing structure of a high-strength fiber composite cable according to claim 1, wherein the casing has cushioning members inside both ends.