JPH0626011A - Guide device for mounting cable on cable stayed bridge - Google Patents

Abstract

PURPOSE:To facilitate operation by inserting a pilot wire extended from a sleeve into the through hole of a fixing block, and pulling the wire, after connecting together a PC steel and the sleeve through a magnet. CONSTITUTION:A magnet 21 having magnetic bearing property of strong magnetic force in the direction of sleeve axis is arranged on the bottom part of a bottomed sleeve 20, and a pilot wire 22 is outward extended from the bottom part of the sleeve 20. One end of the wire 22 is inserted through the through hole 6 of a fixing block 5. Further, after one end of PC steel 30 is inserted into the sleeve 20 so as to magnetically connect to it through the magnet 21, the wire 22 is pulled so as to insert through the steel 30 the through hole 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when constructing a cable-stayed bridge, fixes the end of PC steel material hanging from the main tower to a cable fixing tool provided on the main girder, or vice versa. The present invention relates to a guide device for mounting a cable, which is used when fixing a PC steel material extending from a main tower to a cable fixing tool of the main tower.

[0002]

2. Description of the Related Art A cable-stayed bridge is a type of girder bridge that supports a main girder with a large number of cables that are installed between a main tower and a main girder in a linear and diagonal manner. The cable erected so as to have tension is formed by bundling a large number of PC steel materials obtained by twisting a plurality of PC steel wires.
The upper end of the steel material is fixed to the cable fixing tool provided on the main tower, and the lower end is fixed by the cable fixing tool provided on the main girder.

When a plurality of PC steel materials are bundled and the end of a cable covered with a sheath is fixed by a cable fixing tool, generally a wedge type fixing is adopted, for example, a main girder is contacted via a pressure plate. A large number of through holes are provided at appropriate intervals to attach the wedge to the fixing block.
A PC steel material is passed through one of these through-holes to put it in a pre-tensioned state, and wedges are attached to prevent it from coming off.

In the cable, a large number of PC steel materials are densely bundled in the middle part thereof, but in the fixing part, it is necessary to provide a mutual gap necessary for assembling the wedges. In the vicinity, it is erected so as to have a suitable spread toward the end, and this is covered with a trumpet tube.

[0005]

By the way, when assembling the cable to the fixing device, the trumpet tube which is considerably long in the axial direction as described above is assembled to each of the through holes of the fixing device. It is not easy to reliably pass the corresponding PC steel material.

Therefore, there has been a demand for a method for facilitating this work and an appropriate device used for the work, but no suitable device has been proposed yet.

In view of the above situation, the inventor of the present invention can reliably pass each PC steel material through a predetermined through hole of the fixing block, and can make the work extremely easy. The present invention is proposed for the purpose of providing a guide device for wearing.

[0008]

In order to achieve the above object, the inventor of the present invention has completed the present invention described in the claims.

That is, the feature of the cable mounting guide device for the fixing device of the present invention is that the end portion of the PC steel material that is cable-stayed between the main tower and the main girder of the cable-stayed bridge, for example, the lower end thereof is provided on the main girder. A guide device for inserting and penetrating into a predetermined through hole of a cable fixing tool, having an outer diameter such that the through hole can be inserted, and one side end of which can be inserted the lower end of the PC steel material. A bottomed sleeve that is opened to the bottom, a magnet that is internally mounted near the bottom of the sleeve and that can be magnetically connected to the PC steel end inserted from the opening, and that extends from the bottom of the sleeve. A flexible pilot wire used for guiding the sleeve from one side to the other side of the through hole of the cable fixing tool is provided, and the magnet in the sleeve is constituted by a magnetically anisotropic magnet.

According to the guide device having the above-described structure, the PC steel material and the sleeve are magnetically connected by simply inserting the end portion of the PC steel material into the sleeve, and the connected PC steel material is pulled by pulling the pilot wire. Therefore, if this pilot wire is passed through the through hole of the fixing block in advance, after connecting the above, the pilot wire can be pulled out and the sleeve can be pulled out from the through hole. Can be passed through the through hole.

Further, since the PC steel material is firmly connected by incorporating a magnetic magnet having a strong magnetic force in the axial direction of the sleeve, on the other hand, the magnetic force in the radial direction is weak. It is also possible to suppress the problem that traction resistance increases due to magnetic attraction by the magnetic body. Therefore, the magnetism of this magnet is preferably such that the ratio of the magnetic force in the radial direction to the magnetic force in the axial direction is large.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below based on the embodiments shown in the drawings.

FIG. 3 is a view showing an example of the outline of the structure of a cable fixing tool which is a target for penetrating an end portion of a PC steel material by using the cable mounting guide device of the present invention. A PC steel material insertion hole 2 through which the outer tube heavy tube 3 penetrates is provided.

Reference numeral 4 denotes a square pressure plate having a circular hole provided in contact with the end of the outer tube heavy tube 3.
The tension of the cable applied from the fixing block 5 is transmitted to the main girder 1 by coming into contact with the wall surface of the main girder 1.

As shown in the figure, the fixing block 5 has a large number of through holes 6 formed therein, and each of these through holes 6 has an opening to a side surface (hereinafter referred to as "rear surface") opposite to the cable installation side. A wide-angled portion 7 with a taper for assembling a wedge (not shown) is provided.

Numeral 8 is a sheath tube in the middle of the cable, numeral 9 is a trumpet tube, and numeral 10 is a grout cap for grouting the end of the PC steel material after the wedge assembly.

FIG. 2 shows an example of the outline of the construction of the guide device for mounting the PC steel material used for the through hole 6 of the fixing tool on the main girder side shown in FIG.

That is, the guide device of this example shown in FIG. 2 has a bottomed sleeve 20 having an open end and having a function of restraining the attitude of the PC steel material, and is installed in the bottom of the sleeve 20 in the axial direction of the sleeve. It consists of a magnet 21 having a strong magnetic force and a flexible pilot wire 22 extending out from the bottom of the sleeve. When the PC steel material 30 is inserted from the opening of the sleeve, the PC steel material is Three
The position of 0 is restrained by the sleeve and can be magnetically connected to the magnet in a fixed position along the flow of the magnetic flux, so that a stable connected state can be maintained.

The material of the sleeve and pilot wire is not particularly limited, but it is preferable to use a magnetic material for the former sleeve and a non-magnetic material for the latter pilot wire.

In FIG. 1, the PC steel material 30 is passed through the through hole 6 of the fixing block 5 by using the guide device having the above-described structure.
The outline of the work of inserting into the through hole 6 is shown, and the end of the PC steel material 30 is connected to the sleeve provided at one end of the pilot wire 22 which is inserted into the through hole 6 in advance, and the pilot wire 30 is pulled. The PC
The work of passing the steel material 30 through the predetermined through hole 6 of the fixing block 5 can be easily performed.

[0021]

According to the present invention, the PC steel material and the sleeve are magnetically connected by simply inserting the end portion of the PC steel material into the sleeve, and the PC is pulled by pulling the pilot wire.
Each of the steel materials can be surely passed through a predetermined through hole of the fixing block, and the work is extremely easy.

Further, since the magnet housed in the sleeve is a magnetically anisotropic magnet having a strong magnetic force in the axial direction, a strong connection with the PC steel material can be obtained, but the magnetic force in the radial direction is weak, so this sleeve is pulled. At this time, it is possible to suppress the problem that the magnet is magnetically attracted to the surrounding magnetic body to increase the traction resistance.

Further, since the magnet is internally provided in the vicinity of the bottom of the sleeve, the posture of the PC steel material with respect to the magnet is restrained by the sleeve and stabilized, and there is an effect that the magnetically coupled state can be preferably maintained.

[Brief description of drawings]

FIG. 1 is a view for explaining an outline of an operation of inserting a PC steel material into a through hole of a fixing block using a guide device of the present invention,

FIG. 2 is a sectional view showing a structure of a sleeve portion of the guide device according to the present invention,

FIG. 3 is a diagram showing an example of a configuration outline of a cable fixing tool for penetrating an end portion of a PC steel material using the guide device of the present invention.

[Explanation of symbols]

1 ... Main girder, 4 ... Bearing plate, 5 ... Fixing block, 6 ...
..Through holes, 20 ..... Sleeve, 21 ..... Magnetic magnets, 2
2 ... Pilot wire, 30 ... PC steel material.

Claims (1)

[Claims] 1. A PC cable-stayed between a main tower and a main girder of a cable-stayed bridge.
A guide device for inserting and penetrating an end portion of a steel material into a predetermined through hole of a cable fixing tool provided in a main tower or a main girder, and having an outer diameter such that the through hole can be inserted. ,
Further, a bottomed sleeve whose one end is opened so that the end of the PC steel material can be inserted thereinto, and a PC steel material end portion which is installed near the bottom portion in the sleeve and is inserted through the opening can be magnetically connected. A magnet and a flexible pilot wire extending from the bottom of the sleeve and used to guide the sleeve from one side of the through hole of the cable fixing device to the other side, and the magnet in the sleeve is ,
A cable installation guide device for a cable-stayed bridge, which is composed of a magnetically directional magnet.