JPH11241310A - Covering method for laid cable and cylindrical joint therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a covering method for diagonal cables of a cable stayed bridge applicable both to a new and to an existing cable. SOLUTION: After a wire 11 for preventing the rotation of a cover, commonly used as a guide is laid along a laid cable 14, a cover 1 made in a cylindrical form is made to cover the laid cable and the wire, and a cylindrical joint 5 carved with grooves on the outer circumferential part is fitted to the erection cable 14. A heat generating means 10 is wound around grooves of the cylindrical joint 5, and the end parts of the cover are fitted to the outer circumferential parts of the cylindrical joint, and the cylindrical joint 5 is welded to the cover 1 by heating the heat generating means 10 in the cylindrical joint to cover the erection cable with the cover from one end to the other end while connecting in series the cover through the cylindrical joints.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a method for covering an installation cable of a cable-stayed bridge with a cover for preventing rust or harmonizing with the surrounding environment, and a tubular joint used in the method.

[0002]

2. Description of the Related Art An erection cable fixed between a fixing part on a main tower side and a main girder side of a cable-stayed bridge with required tension is formed by bundling a plurality of strands made of PC steel strands. Is coated with a synthetic resin (for example, polyethylene) for rust prevention and integrated.

[0003] Further, a plurality of strands are bundled and covered with a synthetic resin, and a plurality of the strands is further surrounded by a synthetic resin protective tube, and a space between the protective tube and a plurality of bundled erection cables. Grouting is also known.

[0004]

However, the construction cable is exposed to the wind and rain for a long period of time, and the vibration of the automobile passing through the cable-stayed bridge and the vibration due to the rain and the like are applied. It is unavoidable that the rust preventive means applied to the steel sheet gradually deteriorates.

[0005] When a crack enters the coating made of synthetic resin, rainwater permeates therethrough and the corrosion of the strand may progress. In order to prevent such corrosion, it is not preferable that the synthetic resin coating, which is a means for preventing corrosion of the construction cable, is directly exposed to wind and rain.

Further, in recent years, there has been a demand for a structure that matches the local environment, and the landscape of the installed cable is regarded as important. Therefore, a new or existing installed cable has been colored in harmony with the surrounding environment. Coating the cover is performed.

Therefore, it is conceivable to put a cover on the installation cable in order to protect the installation cable or to prepare the scenery. However, the work is easy and efficient for the installation cable that is installed or temporarily installed between the fixing sections. There is no suitable method for covering the cover in a short period of time, and in many cases, polyethylene is used as the material of the cover from the viewpoint of durability, but with this material, adjacent covers can be connected with an adhesive. There are problems such as inability to do so, and it is desired to solve this.

[0008]

The gist of the present invention for solving the above-mentioned problems of the method for covering an installation cable is as follows.
After laying a wire that also serves as a guide for preventing rotation of the cover and guiding along the erection cable, cover the erection cable and the wire in a cylindrical body, and cover the erection cable with a groove formed in the outer peripheral portion. , A heating means is wound around the groove of the tubular joint, an end of the cover is fitted to an outer peripheral portion of the tubular joint, and the heating means in the tubular joint is heated to generate heat. And the cover is welded, and the cover is successfully connected from one end to the other end of the erection cable while being connected to the cover via a tubular joint.

Further, the heat generating means is a sheet- or tape-shaped synthetic resin product to which a heating wire is previously adhered, and is attached so that the heating wire is positioned on an outer surface when wound around a groove. Is included.

The gist of the tubular joint according to the present invention is a tubular joint for successfully connecting a cover made of synthetic resin,
A groove for winding at least the heat generating means is formed in the outer peripheral surface of the joint in the circumferential direction, and a wire for preventing rotation of the cover and also serving as a guide is inserted through the cylindrical joint along the axial direction. Is provided.
Further, it includes that a projection is provided on the inner peripheral wall surface of the tubular joint to maintain a gap with an installed cable inserted into the tubular joint.

According to the method for covering an installation cable according to the present invention, a cover having a required length is provided for a newly-installed or existing installation cable which is installed between both fixing portions such as a cable-stayed bridge. This makes it possible to easily connect and cover the cable, and provides a method that can cover both new and existing erection cables.

Further, since the cover is welded and connected by the joint for the cylinder, the waterproofness is secured, and the rust-preventing effect of the erection cable is enhanced. Furthermore, in winding the heat generating means in the groove of the cylindrical joint, the work is completed only by winding the sheet-shaped or tape-shaped synthetic resin product to which the heat wire is previously adhered into the groove, and the hot-wire winding operation is completed. It will be easier.

[0013] The tubular joint according to the present invention makes it possible to easily cover a new or existing erection cable and cover the cable, and the tubular joint is provided with a groove for a wire, and the wire is inserted into the groove. By doing so, it becomes a guide for moving the cover in the cover construction, and after the cover construction, rotation of the cover around the axis due to wind and rain is prevented.

[0014] Further, since a projection for maintaining a gap with the bridge cable inserted into the tube joint is provided on the inner peripheral wall surface, the bridge cable is disposed without bias in the tube joint and the cover. Fillers such as urethane foam resin filled in the gaps can be smoothly filled.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for covering an installation cable according to the present invention and a tubular joint used in the method will be described with reference to the drawings.

The cylinder joint 5 according to the present invention is shown in FIGS.
As shown in FIG. 2, a cylindrical body made of a synthetic resin such as polyethylene and having two semicircular bodies 6, 6 divided into two. The size of the semicircular body 6 is a size that includes the erection cable 14 (see FIG. 9), and has an outer diameter that is substantially the same as the inner diameter of the cylinder when the cover 1 is formed into a cylinder. .

An outer circumferential surface of a cylindrical body formed by joining the two divided semicircular bodies 6 and 6 is formed along the circumferential direction thereof.
Grooves 7, 7 for temporary fixing are engraved on the end side,
Grooves 8, 8 are formed in the center of the heating wire 10 (see FIG. 7) as heat generating means.

The groove 8 has such a depth that the heating wire 10 wound around the groove is not exposed to the outer surface.
Further, the width of the groove 8 is set so that the heating wire 10 can be wound plural times.
It is set to an appropriate width.

Further, as shown in FIGS. 2 and 3, a wire 11 (for preventing rotation) is provided on the inner peripheral surface of the cylinder formed by the semicircles 6 and 6 along the axial direction of the cylinder. (See FIG. 8). The groove 9 is
This is a groove through which the wire 11 is inserted. The groove may be a U-shaped groove or the like provided on the inner peripheral surface of the cylindrical body,
There may be a through hole provided between the inner and outer peripheral surfaces of the cylindrical body so as to penetrate both end surfaces of the cylindrical body.

When the wire 11 is inserted through the concave groove 9, the tubular joint 5 is slidably guided by the wire 11, and the circumferential rotation of the erection cable 14 is prevented.

As shown in FIG. 4, the cover 1 used in the first embodiment of the present invention is an elongated cylindrical body made of a synthetic resin having flexibility, for example, polyethylene.
The outer periphery of the cylindrical body is cut at one location along the longitudinal direction.

The sectional shape of the cut portion 2 is shown in FIG.
As shown in the figure, the V-shape is formed outward. A heating wire 3 (see FIG. 6) serving as a heating means to be described later is fitted into the V-shaped cut portion 2 for connection.

As shown in FIG. 6, the heating wire 3 also has a linear portion made of a synthetic resin such as polyethylene, and has a V-shaped cross section.
It is shaped like a letter and fits in the cutting section 2.

Further, at both ends in the longitudinal direction of the cover 1,
Notches 4 are provided at two locations, each having a required cut amount, for fitting with a tubular joint 5 described later.

By using the tubular joint 5 formed as described above, for example, as a protection tube, an existing erection cable 14 that is tensioned and erected at both fixing portions 12 and 13 of a cable-stayed bridge is provided. A method of covering the cover 1 will be described.

First, as shown in FIGS. 8 and 9, both fixing units 1 are arranged on both sides along the existing erection cable 14.
A thin wire 11 is stretched between 2 and 13. As described above, the wire 11 is communicated with the concave groove 9 of the tubular joint 5 and serves as a guide for attaching and moving the tubular joint 5.

The wire 11 is, for example, an aramid wire, a steel wire, a PC steel wire, or the like. In other words, the wire 11 is strong in strength and maintains durability for a long period of time. It suffices if there is, and there is no particular limitation.

Next, the cylinder joint 5 or the cover 1 is attached. However, it is not particularly limited which one is attached first. In order to improve work efficiency, a plurality of the cylinder joints 5 are provided in advance. It is preferable to attach it to the individual wires 11.

Therefore, in order to attach the tube joint 5, 2
The semicircular bodies 6 and 6 are joined together such that the groove 9 of each of the divided semicircular bodies 6 and 6 is aligned with the wire 11 so as to sandwich the erection cable 14 from both sides.

Then, as shown in FIG.
For example, in the two butted portions 15 where the 6 has been butted, for example, the portions of the grooves 7 and 7 are heated and welded with a solder iron or the like, and temporarily fixed to form the tubular joint 5.

In this case, as another temporary fixing method, a thin synthetic resin rod is applied across the two semicircles 6 and 6 in the grooves 7 at the abutting portion. 7 may be heated by a soldering iron and welded together. In addition, as shown in FIG. 20, a notch 26 is provided in the tangential direction at the joint between the two semicircles 6b, 6b, and an appropriate hole 27 is formed. The two semicircles 6b may be temporarily fixed by being attached. Thereby, the temporary fixing work can be easily performed.

Thereafter, the grooves 8, 8 of the cylindrical joint 5 which has become a cylindrical body,
8, a heating wire 10 as a heating means shown in FIG. 7 is wound a plurality of times. At this time, the metal terminal 10 of the heating wire 10
As shown in FIG. 10, a is arranged so as to be on the same side in one heating wire 10, and the terminals of the two heating wires 10 are arranged so as to approach the center of the cylindrical body. This is to prevent a total of four terminals 10a from interfering with the connection between the protective tubes when connecting the covers 1 and 1 later.

In order to wind the heating wire 10 around the groove 8,
The terminals 10a and 10a are positioned on the same side in advance, and the remaining wire portion is folded in two and wound around the groove 8 as it is.

After the heating wire 10 is wound around each groove 8, for example, the synthetic resin coating of the heating wire 10 and the groove 8 portion are heated with a soldering iron, and the heating wire 10 and the side wall of the groove 8 are welded. Then, the heating wire 10 is fixed to the joint 5 for a cylinder.

After attaching the plurality of tubular joints 5 to the erection cable 14 and the wires 11, 11 in this manner, the cut portion 2 of the flexible cover 1 is manually expanded. Then, as shown in FIG. 11, the erection cable 14 and the wires 11, 11 are covered with the opening.

Then, approximately half of the tube of the tube joint 5 is fitted into the opening at the end in the axial direction of the tube-shaped cover 1 covering the construction cable 14.

At this time, the heating wire 10 on one side of the pipe joint 5
Are arranged in the notches 4 and 4 of the cover 1, respectively, and assembled so that the terminal 10a protrudes from the notch 4.

Thereafter, as shown in FIG. 12, the cover 1, 1 formed into a cylindrical body and the cylindrical joint 5 are fitted so that the terminal 10a projects from the notch 4 as described above, The electrodes of the power supply are connected to the terminals 10a, 10a, and the terminals are turned on and heated. In addition, the heating wires 10, 10
May be heated simultaneously or not at the same time.

As a result, the synthetic resin coating of the heating wire 10 is melted, and the cover 1 and the joint 5 for a cylinder are connected.

Thus, the erection cable 14 and the wire 1
The pipe joint 5 and the cover 1 are attached to the pipes 1 and 11, and the cover 1 is successfully connected via the pipe joint 5 so as to cover the protection tube on the newly installed cable 14. .

To push up the cover 1 toward the fixing portion 13 on the other end side as shown in FIG.
Are guided by the wires 11, 11 connected to the concave groove 9 for movement while preventing rotation about the axis, and the cover 1 is pulled up by the winch 18 or the like, and the other end is sequentially turned up. What is necessary is just to move to the fixing unit 13 on the side.

As a second embodiment of the present invention, a cylinder joint 5a
Is divided into semicircles 6 as shown in FIGS.
a, a semi-circular body 6a is provided with a U-shaped groove or a round hole 21 through which the wire 11 is inserted;
In that a flange 20 is provided at the center in the longitudinal direction at the outer peripheral portion,
This is different from the cylinder joint 5 of the first embodiment. Reference numeral 19 is used to bite the wire 11 for preventing rotation.
The semicircular groove in the case where a semicircular groove or a circular hole is sometimes provided on the side end surface of the semicircular body 6a is shown.

The connecting cable 14 is connected to the pipe joint 5a.
In order to cover the cover 1, as shown in FIG. 16, when the wire 11 is laid along the erection cable 14, a required number of cylinder joints 5a are prepared in advance, and each of the cylinder joints 5a is provided.
The wire 11 is inserted into the U-shaped groove or the round hole 21 and one wire 11 is erected on the upper side.

FIG. 17 (a), (b), (c),
As shown in (d), the cover 1 is put over the erection cable 14 and the wire 11, and the cover 1 is temporarily fixed or the like and welded with the hot wire 3 to form an integral cylindrical body.

Thereafter, the cylindrical cover 1 is fitted and attached at its end to the cylindrical joint 5a, and is heated by the heating wire 10 of the cylindrical joint 5a so that the cover 1 can be connected successfully. It is. Since the cover 1 abuts against the flange 20 of the tubular joint 5a, and the flange 20 serves as a positioning stopper when the cover 1 is fitted to the tubular joint 5a, the work of covering the protective tube is facilitated. . In addition, by setting the outer peripheral dimension so that the outer peripheral surface of the flange 20 is flush with the outer peripheral surface of the cover 1, 1 to be connected, there is no projection between the covers 1, 1 on the outer surface. Articulated cover 1,
The outer surfaces of 1, ... become smooth and beautiful outer surfaces without catching.

Further, a wire 11 for preventing the cover 1 after covering the erection cable 14 from rotating in the circumferential direction.
However, since there is only one on the upper side, it is also preferable to interpose a spacer or the like in the lower gap between the erection cable 14 and the tubular joint 5a.

As a third embodiment of the present invention, a cylinder joint 5b
(Not shown) may be formed into a cylindrical body composed of three or more divided bodies, or may be thinned and cut along the entire length along the longitudinal direction at the side wall of the cylindrical body. It is also possible to form a cylindrical body that allows the opening. With such a configuration, it is possible to cope with both the newly installed cable 14 and the existing cable 14.

In each of the above embodiments, the construction cable 14
And the gap between the cylinder joints 5, 5a, 5b or the cover 1,
Sometimes it grouts, sometimes it doesn't.

As a fourth embodiment of the present invention, as shown in FIGS. 18 to 19, the operator does not directly wind the hot wire 10 wound around the grooves 8, 8 of the tubular joint 5c by hand. A sheet-like or tape-like synthetic resin product, for example, a plurality of heat rays 10 are repeatedly adhered to one surface of the adhesive tape 22 in advance, and the protective paper on the other surface of the adhesive tape 22 is peeled off. The adhesive layer is exposed, and the adhesive tape 22 is wound around and adhered to the groove 8.

The adhesive tape 22 has a width a substantially equal to or slightly smaller than the width of the groove 8, and a length b in the longitudinal direction is substantially equal to a length of one circumference of the groove 8. By forming such a sheet-shaped or tape-shaped synthetic resin product to which the heating wire 10 has been previously adhered, the operation of winding the heating wire 10 around the tubular joint 5c can be easily performed by a single winding operation of the tape. And can be done quickly. In addition, as a method of attaching the heating wire 10 to the sheet-shaped or tape-shaped synthetic resin product in advance, for example, laminating a resin tape or a resin sheet on the heating wire 10 on both sides or one side,
It is proposed to heat the resin sheet and fuse it to a resin sheet or a resin tape.

As a fifth embodiment of the present invention, as shown in FIG. 20, a projection 23 having an appropriate amount of protrusion is provided on the inner peripheral wall surface of each of the semicircular bodies 6b, 6b of the cylinder joint 5d in the circumferential direction. For example, they may be provided in three places at equal positions or at right angles to each other.

The projection 23 may be formed integrally with the semicircular body 6b, or may be provided with a fitting hole 24 so that the projection 23 having the fitting portion 23a is fitted into the hole. good. Further, the projection 23 may have a semi-spherical shape, or may be uniformly long along the longitudinal axis of the tubular joint 5b and have a semi-circular cross-sectional shape.

Since the projections 23 are present on the inner peripheral wall surface of the cylindrical joint 5d, a uniform gap is secured between the projection 23 and the outer peripheral surface of the erection cable 14 inserted therethrough. Accordingly, the bias of the erection cable 14 is prevented, and in the operation of injecting the filler such as urethane foam from the inlet 25 after the cover work, the gap is kept uniform, so that the filling operation becomes smooth, and It will be easier.

As described in each of the embodiments according to the present invention, a new or existing
The cover 1 made of synthetic resin (made of PE or the like) which cannot be connected by the bonding means can be easily covered by the welding means using the tubular joints 5, 5a, 5b, 5c, 5d of the present invention. Things.

[0055]

As described above, according to the method for covering an erection cable according to the present invention, a wire for preventing rotation of the cover and guiding is erected along the erection cable, and then the cover is attached to the erection cable and the wire. A tubular joint with a groove formed in the outer peripheral portion is attached to the erection cable, a heating means is wound around the groove of the cylindrical joint, and the cover is provided on the outer peripheral portion of the cylindrical joint. And the heat generating means in the tubular joint is heated to weld the tubular joint and the cover, and the cover is successfully connected via the tubular joint while being connected from one end to the other end of the erection cable. Since it is a cover method that covers the side, it has an excellent effect that the cover as a protective tube can be easily attached to the newly installed or existing erection cable with the joint for the cylinder. That.

Further, since the cover is welded and connected with the joint for the cylinder, the waterproofness is ensured, and the rust prevention effect of the erection cable is enhanced. Furthermore, in winding the heat generating means in the groove of the cylindrical joint, the work is completed only by winding the sheet-shaped or tape-shaped synthetic resin product to which the heat wire is previously adhered into the groove, and the hot-wire winding operation is completed. This has an excellent effect that it becomes easy and the number of work steps is reduced.

The cylindrical joint according to the present invention is a cylindrical joint for connecting the cover made of synthetic resin to the end thereof, and at least a groove for winding the heating means is formed in the outer peripheral surface of the joint in the circumferential direction. In addition, the joint is provided with a groove for preventing the rotation of the cover and inserting a wire that also serves as a guide along the axial direction, so that the cover extends over the entire length of the new or existing erection cable. And a wire is communicated with the groove to prevent rotation of the cylindrical joint and the cover connected to the cylindrical joint.

Further, a projection is provided on the inner peripheral wall surface of the tubular joint so as to maintain a gap between the tubular cable inserted into the tubular joint and the built-in cable is biased in the tubular joint and the cover. This is an excellent effect that a filler such as urethane foam resin, which is arranged without being filled and is filled in the gap, can be smoothly and easily filled.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a tubular joint according to a first embodiment of the present invention.

FIG. 2 is a front view of a semicircular body obtained by dividing the joint for a cylinder into two parts.

FIG. 3 is a side view of the tubular joint.

FIG. 4 is a perspective view of a cover according to the first embodiment of the present invention.

FIG. 5 is a front view of the cover of the first embodiment.

FIG. 6 shows the entire heating wire 3 used for the cut portion of the cover,
It is a side view which showed the cross-sectional shape in the center part.

FIG. 7 is a front view of a hot wire wound around the tubular joint according to the first embodiment of the present invention.

FIG. 8 is a view showing a configuration of both fixing units 12, according to the first embodiment of the present invention;
FIG. 3 is an explanatory view of a state in which wires 11, 11 are laid on both sides of a erection cable 14 laid between them.

FIG. 9 is an explanatory view showing a state in which the tubular joint 5 according to the first embodiment of the present invention is attached to the erection cable 14 so as to be guided by the wire 11;

FIG. 10 is a front view showing a state in which the heating wire 10 is wound around the tubular joint 5 according to the first embodiment of the present invention.

FIG. 11 is an explanatory view showing a state in which a cover is attached to the erection cable with a tube joint by the cover method according to the first embodiment of the present invention.

FIG. 12 is an explanatory view showing a state where the cover is successfully connected with the joint for the cylinder according to the first embodiment of the present invention.

13 (a), 13 (b), and 13 (c) are diagrams illustrating a construction procedure in the first embodiment of the present invention.

FIG. 14 is a front view of a cylinder joint 5a according to a second embodiment of the present invention.

FIG. 15 is a side view of the cylinder joint 5a of the second embodiment.

FIG. 16 is an explanatory view showing a part of a state in which the bridging cable 14 is covered with the cover 1 and the tubular joint 5a by the cover method of the second embodiment.

FIG. 17 is explanatory diagrams (a), (b), (c), and (d) showing construction procedures of the second embodiment.

FIG. 18 is a perspective view of an adhesive tape 22 used for the tube joint 5c according to the fourth embodiment.

FIG. 19 is a front view of a tube joint 5c according to the fourth embodiment.

FIG. 20 is a sectional view of a cylinder joint 5d according to the fifth embodiment.

[Explanation of symbols]

1 cover, 2 cut section, 3 heating wire, 4 notch, 5
The cylinder joint of the first embodiment, 5a The cylinder joint of the second embodiment,
5c Cylinder joint of the fourth embodiment, 5d Cylinder joint of the fifth embodiment, 6, 6a, 6b Semicircular body of the cylinder joint, 7 Temporary fixing groove, 8 Heat wire groove, 9 Concave groove, 10 hot wire, 11
Wire, 12, 13 fixing part, 14 erection cable, 18 winch, 20 flange, 21 U-shaped groove or round hole, 22 adhesive tape, 23 protrusion, 24 fitting hole, 2
5 Inlet.

Claims (4)

[Claims] 1. A cable for preventing rotation of a cover and for guiding along a construction cable, and then covering the construction cable and the wire with a cover as a cylinder, and forming a groove in an outer peripheral portion. A joint is attached to the erection cable, a heating means is wound around a groove of the tubular joint, and an end of the cover is fitted to an outer peripheral portion of the tubular joint,
Causing the heat generating means in the tubular joint to generate heat, welding the tubular joint and the cover, and covering the cover from one end to the other end of the erected cable while successfully connecting the cover via the tubular joint. Characteristic method of covering installation cables. 2. The heating means is a sheet- or tape-shaped synthetic resin product to which a heating wire is previously adhered, and is attached so that the heating wire is positioned on an outer surface when wound around a groove. The method for covering an installation cable according to claim 1, characterized in that: 3. A tubular joint for successfully connecting a cover made of a synthetic resin, wherein a groove for winding at least a heat generating means is engraved on an outer peripheral surface of the joint in a circumferential direction. A groove for preventing rotation of the cover and inserting a wire also serving as a guide in the axial direction of the joint. 4. The cylinder according to claim 3, wherein a projection is provided on an inner peripheral wall surface of the cylinder joint so as to maintain a gap with an erection cable inserted into the cylinder joint. Fittings.