JPH09137407A - Method of overlap construction of diagonal-member cable and protective pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repair a diagonal-member cable easily by a method wherein a cut surface is formed to a cylindrical body along the longitudinal direction of the cylindrical body, a protective pipe, in which a melting means is mounted to a cut surface section, is fitted to the existing diagonal-member cable, the cut surface of the protective pipe covering the diagonal-member cable is fast stuck by the melting means, and the diagonal-member cable is covered with the protective pipe. SOLUTION: A cylindrical body 4a made of polyethylene is cut in two pieces in the longitudinal direction, and heating wires 5 are buried to the cut surfaces sections 4b cut, and a protective pipe 4 is manufactured. A diagonal-member cable is covered with the protective pipe, the heating wires 5 are heated by electric energization, the opposed end sections of the cut surface sections 4b are melted, and the cylindrical bodies 4a, 4a split in two pieces are welded. The diagonal-member cable is covered similarly with the next protective pipe 4. The diagonal-member cable is covered with the protective pipes 4, and sections among the interior wall surfaces of the protective pies 4 and the surface of the diagonal-member cable are filled with fillers such as cement paste and repaired. Accordingly, cost at a time when the cable is repaired can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an existing diagonal cable laid between a fixing portion on the main tower side and a fixing portion on the bridge girder side of a cable-stayed bridge or a Nielsen bridge with a protective pipe. And a protective tube used in the method.

[0002]

2. Description of the Related Art Conventionally, in many cable diagonal cables for cable-stayed bridges constructed early on, ropes were painted or cables were plastic-wrapped.

With the passage of time, the coating layers of the ropes and cables of these cables have deteriorated, and it has become necessary to repair them.

[0004]

However, these cables, ropes, and the like cannot be exchanged because they are actually passed by automobiles and the like. Therefore, there is a demand for a method of repairing the coating layer in a state where the cable or the like is used as it is.

As described above, conventional cables such as cable-stayed bridges have problems to be solved in repairing deterioration of the cable due to aging. The present invention has been made in view of the above problems, and an object of the present invention is to provide a repairing method and a protective tube for the repairing method that can easily repair a cable.

[0006]

The gist of the above-described problem of the method for overlapping a diagonal cable according to the present invention is to provide a tubular body with a cut along the longitudinal direction thereof and to melt the cut. The protection tube having the means is fitted to the existing diagonal cable, and the cut end of the protection tube covered with the diagonal cable by the melting means is brought into close contact with the cable to cover the diagonal cable. That is.

An existing diagonal cable is formed by forming a protective tube with a tubular body having a tubular body provided with a cut along the longitudinal direction thereof and a melting means which is fitted into the cut of the tubular body and brought into close contact with the tubular body. While fitting the cylinder body into, the melting means is inserted into the cut portion of the cylinder body, the cut portion of the cylinder body covered with the diagonal cable is brought into close contact with the melting means,
The diagonal cable is covered with the protection tube.

The melting means for bringing the cut ends into close contact is formed elongated along the cut ends of the cylinder main body, and has a substantially T-shaped cross-section orthogonal to the longitudinal direction thereof, and at least a portion contacting the cut ends is provided with a heating wire. It is a rod-shaped body to be buried; and, further, the protection pipe is covered with the existing diagonal cable by sequentially pushing up from the bridge girder side to the main tower side.

The protective tube according to the present invention is composed of a cylinder body having a cut body provided with a cut along the longitudinal direction thereof, and a fusing means for closely contacting the cut.

Further, the melting means for closely contacting the cut end is a heating wire embedded in the cylinder main body along the cut end; and further, a cross-sectional shape which is formed elongated along the cut end and is orthogonal to the longitudinal direction thereof. Is a substantially T-shape, and is a rod-shaped body in which a heating wire is embedded at least in a portion in contact with the cut end; and the cylindrical body is a polyethylene pipe.

According to the method for overlapping a diagonal cable according to the present invention, for example, a tubular body in which a tubular body is divided into two by a cut portion of a protective pipe is provided for an existing diagonal cable of a cable-stayed bridge. Alternatively, a cut provided at one location of the tubular body is expanded to overlap the tube main body with the diagonal cable, and thereafter, a melting means for bringing the cut into close contact is acted to melt the cut and cut the cut. The cables are closely attached and the protection pipe is covered with the existing diagonal cable.

[0012] Then, for example, by covering the diagonal pipe with the protection pipe from the bridge girder side and advancing to the main tower side while adjoining the adjacent protection pipes by the connecting means, the diagonal pipe cable has its entire length. Is covered over.

[0013]

Next, an embodiment according to the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the first embodiment of the overlap cable cable construction method according to the present invention is, for example, between a fixing portion on the bridge girder 1 side and a fixing portion on the main tower 2 side in a cable-stayed bridge. The protection tube 4 is covered on the diagonal cable 3 which is tensioned and erected.

The protective tube 4 will be described. As shown in FIG. 2, the protective tube 4 is made of polyethylene and has a size of, for example,
A tubular body 4a having a total length of about 2 m and an outer diameter of about 100 mm to 250 mm (thickness of about 4 mm to 7 mm) is cut along the longitudinal direction to form a tubular body.

Then, at the cut end 4b,
A plurality of heating wires 5 are embedded along the longitudinal direction of the cut end at the opposite ends forming the cut end to form a melting means.

When the tubular body 4 is formed with a mold, the heating wire 5 is placed in advance in the mold, and then melted polyethylene is poured thereinto to be embedded. . Further, the portion of the embedded heating wire 5 protruding from the end of the tubular body is cut.

In this way, the protection tube 4 formed by the tubular body having the cut end and the melting means is divided into two tubular bodies 4a, 4a as shown in FIG. On the bridge girder side, and then the tubular body 4
Electricity is supplied to each of the heating wires 5 of a from a power supply device (not shown) to heat them. Then, the opposing end portions of the cut portion 4b are melted, and the halved cylindrical bodies 4a, 4a are welded.

After that, the coated protective tube 4 is pushed up to the main tower side, and the next protective tube 4 is coated on the diagonal cable 3 in the same manner as described above. Parts (top and bottom end surfaces), for example, by connecting means such as a butt seam resistance welding method, a connection method using a hot wire socket, or a slitting fitting method, sequentially connecting the protective tubes 4 in succession to form a diagonal member. Cover the entire length of the cable 3.

Then, the covered protective tube 4,
A filling material (for example, cement paste, mortar, or other general rust preventive material) is filled between the inner wall surfaces of 4, ... And the surface of the diagonal cable 3 for repair.

In the second embodiment of the method for overlapping the diagonal cable according to the present invention, as shown in FIG. 3, the protective tube 6 is cut at one location in the cylinder body, and the heating wire 5 is provided at the cut portion 6b. It is different from the first embodiment in that it is buried and the melting means is formed.

Therefore, when the protection pipe 6 is covered with the existing diagonal cable 3, the cut portion 6b of the tubular body 6a is forcibly expanded and inserted into the diagonal cable 3, and the protection pipe 6 is used as a cable. After the fitting, the heating wire 5 of the cut portion 6b is energized to heat the cut wire 6b to bring the cut portion into close contact. After that, the construction is performed in the same procedure as in the first embodiment.

As described above, according to the first or second embodiment of the present invention, the cable is not replaced with the existing diagonal cable 3 whose cable coating layer requires repair due to aging. Keeping the installation state, protect tube 4,
6 can cover the diagonal cable 3.

A third embodiment of the method for overlapping a diagonal cable according to the present invention is, as shown in FIGS. 4 to 5, a tubular body having a tubular body 8a divided into two and provided with cuts 8b and 8b. The protection tube 8 is formed by providing a melting means for closely contacting the cut edge 8b.

As a fusing means for bringing the cut ends into close contact with each other, it is formed in a slender shape along the cut end 8b of the cylindrical body 8a, and its cross-section orthogonal to the longitudinal direction is substantially T-shaped and abuts at least the cut end 8b. The rod-shaped body 7 in which the heating wire 5 is embedded is formed in the portion.

The rod-shaped body 7 is made of polyethylene, and a plurality of heating wires 5 are embedded in the arc-shaped brim portion 7a toward the side contacting the surface of the cylindrical body 8a. Also,
A plurality of heating wires 5 are embedded in a fitting portion 7b which is orthogonal to the brim portion 7a, and the length of the fitting portion 7b is the cylindrical body 8
It is almost the same as the thickness of a.

As described above, the melting means is provided separately from the cylindrical body 8a, which is a difference from the first and second embodiments.

Then, in order to overlap the protection tube with the diagonal cable 3, in order to overlap the protection tube, the tubular body 8 which is divided into two on the bridge girder side is used.
The diagonal cables 3 are covered with a and 8a, and then the rod-shaped bodies 7 are inserted into the two cuts 8b.

Then, each of the heating wires 5 of the rod-shaped body 7 is heated by applying electricity from a power supply device (not shown). As a result, the opposing ends of the cuts 8b are melted, and the two split cylindrical bodies 8a, 8a are welded to each other. After that, the diagonal tube cable 3 is covered with the protective tube 8 in the same manner as in the first or second embodiment.

Next, in the fourth embodiment of the present invention, as shown in FIG. 6, the protective tube 9 is provided with a cut 9b along the longitudinal direction at one location of the tubular body 9a, and the other is provided. This is similar to the third embodiment.

To cover the existing diagonal cable 3 with this protective tube 9, the cut portion 9b of the tubular body 9a is forcibly expanded and inserted into the diagonal cable 3, and the T-shaped rod-shaped body is formed. 7 is inserted into the cut portion 9b, and the protection tube 9 is attached to the diagonal cable 3.

After that, the heating wires 5 of the rod-shaped body 7 are respectively energized to heat them, and the cuts 9b are brought into close contact with each other. After that, the construction is performed in the same procedure as in the first or second embodiment.

[0032]

As described above, according to the method for overlapping a diagonal cable according to the present invention, a cutout is provided in a tubular body along the longitudinal direction thereof, and a melting means is provided at the cutout. Is fitted to an existing diagonal cable, and the cut end of the protective tube coated on the diagonal cable by the melting means is brought into close contact, so that the diagonal cable is covered with the protective tube. This has an excellent effect that the cable can be covered over the entire length by the work, and the cost for repairing the cable and the work period can be shortened.

An existing diagonal cable is formed by forming a protective tube with a tubular body having a tubular body provided with a cut along the longitudinal direction thereof and a melting means which is fitted into the cut of the tubular body and brought into close contact with the tubular body. While fitting the cylinder body into, the melting means is inserted into the cut portion of the cylinder body, the cut portion of the cylinder body covered with the diagonal cable is brought into close contact with the melting means,
By covering the protection tube on the diagonal cable, the manufacturing of the cylinder main body is simplified and the manufacturing cost is reduced, and since the melting means is separately formed, the joint strength of the cut end is increased and the appearance is good-looking. It has an excellent effect that it can be coated.

Furthermore, if the protection pipe is constructed so as to cover the diagonal cable from the bridge girder side of the existing diagonal cable in order, the worker will not be required to work at high places. It has an excellent effect that the safety of is secured.

Since the protective tube according to the present invention comprises a tubular body having a tubular body provided with a cut along the longitudinal direction thereof, and a melting means for bringing the cut into close contact, a tube for an existing diagonal cable is provided. It has an excellent effect that it can be welded and coated after being covered with the sheet.

Melting means for bringing the cut ends into close contact can be provided at the cut ends or can be provided separately from the tubular body to improve workability or reduce the manufacturing cost of the tubular body. The melting means formed into a body can be cut to an appropriate length for use, and there is an excellent effect that there is no waste of material.

Further, if the melting means is a heating wire embedded in the cut portion or embedded in a separate rod-shaped body, or if the cylindrical body is a flexible polyethylene pipe, the welding work or the cut portion can be performed. This has an excellent effect that the work of expanding and covering the cable becomes easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a construction state of an overlap construction method for a diagonal cable according to the present invention.

FIG. 2 is a vertical cross-sectional view of a protection tube according to the first embodiment of the present invention.

FIG. 3 is a vertical sectional view of a protective tube according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a rod-shaped body according to a third embodiment or a fourth embodiment.

FIG. 5 is a sectional view of a protection tube according to a third embodiment.

FIG. 6 is a sectional view of a protection tube according to a fourth embodiment.

[Explanation of symbols]

 1 bridge girder, 2 main tower, 3 diagonal cable, 4, 6, 8, 9 protection tube, 4a, 6a, 8a, 9a tubular body, 4b, 6b cut end part, 5 heat wire, 7 rod-shaped body, 8b, 9b cut end .

Claims (8)

[Claims] 1. A protection pipe having a cut portion provided in a tubular body along a longitudinal direction thereof and a melting means provided at the cut portion is fitted to an existing diagonal cable, and the diagonal member is melted by the melting means. A method for overlapping a diagonal cable, characterized in that a cut end of a protective tube covered with the cable is brought into close contact with the cable to cover the protective tube. 2. An existing diagonal cable, wherein a tubular body is formed by providing a tubular body with a cut along the longitudinal direction thereof, and a melting means that is fitted into the cut of the tubular body and brought into close contact with the tubular body. While fitting the tube main body in, the melting means is inserted into the cut end of the cylinder main body, the cut end of the cylinder main body covered with the diagonal cable is brought into close contact with the melting means, Overlap construction method for diagonal cables, which is characterized by covering a protective tube. 3. A melting means for closely adhering the cut end is formed in a slender shape along the cut end of the cylinder body, and has a substantially T-shaped cross-section orthogonal to the longitudinal direction, and at least a portion contacting the cut end has a heating wire. 3. The method for overlapping a diagonal cable according to claim 2, wherein is a rod-shaped body in which is embedded. 4. The diagonal cable according to claim 1 or 2, wherein the protection pipe is covered with the diagonal cable by sequentially approaching the main tower side from the bridge girder side of the existing diagonal cable. Overlap method. 5. A protective tube comprising: a tubular body having a tubular body provided with a cut along the longitudinal direction thereof; and a melting means for bringing the cut into close contact with each other. 6. The protective tube according to claim 5, wherein the melting means for bringing the cut ends into close contact with each other is a heat wire embedded in the cylinder main body along the cut ends. 7. A melting means for closely contacting the cut end is formed elongated along the cut end and has a substantially T-shaped cross-section orthogonal to the longitudinal direction thereof, and the heating wire is embedded at least in a portion in contact with the cut end. The protective tube according to claim 5, which is a rod-shaped body. 8. The protective tube according to claim 5, wherein the tubular body is a polyethylene tube.