JPH07336856A - Device for expanding/contracting offset of cable laid along bridge - Google Patents

Abstract

PURPOSE:To shorten the assembly time of a device for expanding/contracting offset of a cable laid along a bridge and improve the strength of the device by constituting a frame which connects frames at trough sections with a frame at a crest section in such a way that one sides of members installed across cables and members installed along the cables are perfectly fixed and the other sides of the members crossing the cables are not fixed, but put on the members installed along the cables on the same side of the cables. CONSTITUTION:A device for expanding/contracting offset of cable laid along bridge is composed of frames 1 and 5 at left and right trough sections, a frame 3 at a central crest section, and lines 2 and 4 connecting the frames 1, 3, and 5 with each other and the frames 1, 3, 5 are connected to the lines 2 and 4 with rotatable connecting sections 6. Members 2c and 4c installed across cables are perfectly fixed to members 2b and 4b on one side and put on members 2a and 4a on the other side. Therefore, when the members 2c and 4c shrink, the members 2c and 4c slide on the members 2a and 4a. Accordingly, the number of the rotatable connecting sections can be reduced to the utmost and the device can be constituted in a completely fixed structure. Therefore, the assembling time of this device can be shortened and the strength of the device can be improved, because the device can easily be assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset expansion / contraction device for fixing a cable, particularly a power cable, inside a bridge and fixing the cable therein so as to absorb expansion / contraction occurring in the bridge.

[0002]

2. Description of the Related Art In recent years, in order to secure transmission lines in combination with the construction of long bridges, laying of power cables on these long bridges has been studied, and some of them have already been put to practical use. In laying a power cable on such a bridge, a special laying technique is indispensable, and one of them is an offset expansion / contraction device for absorbing expansion / contraction of the bridge girder that occurs due to temperature change or the like in the gap of the bridge girder. FIG. 4 is a plan view showing the structure of an example of such an offset expansion / contraction device. That is, the offset expansion / contraction device has the valley frames 1 and 5 on both sides and the apex frame 3 at the center.
And five frames 2 and 4 connecting these frames.

These five frames are connected by a connecting portion 6 which is rotatable by a connecting pin, and the intermediate frames 2 and 4 are members 2c, 4c for passing in a direction traversing the cable and members 2a, 4a for passing in a cable laying direction. 2b, 4a, and 4b are all connected by a rotary connecting portion 6. The cable 7 is laid in this expansion / contraction device, and in the frame 3 of the center offset apex and the frames 1 and 5 of the left and right valleys, the offset apex and the straight line transition part are fixed as shown in the sectional view of FIG. In addition, in the frames 2 and 4 that connect the frame 3 at the top of the center and the frames 1 and 5 at the left and right valleys, the offset inflection point is fixed by the rotating cleat 9 as shown in the sectional view in FIG. It is in the state of doing. Therefore, the offset expansion / contraction device has a structure in which, when a contraction force indicated by an arrow is applied to the frame 5 of the valley on the right side, for example, the offset expansion / contraction device is deformed as shown in FIG.

[0004]

As described above, the offset expansion and contraction device has a complicated structure, and the neck between the offset apex frame 3 and the valley frames 1 and 5 is particularly a bottleneck in assembly. Frames 2 and 4 to connect. That is, the frames 2 and 4 and the members 2a, 2b, 4a and 4b that pass the members 2c and 4c passing in the direction traversing the cable in the cable laying direction and the rotation connecting portion 6 are all included.
However, since it requires a lot of parts to be assembled, the number of parts is large, the manufacturing cost is high, and the rotary connection structure has some problems such as weak strength.

The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned problems and to provide an offset expansion / contraction device having a structure which is easy to assemble and has a strong strength. .

[0006]

The present invention relates to an offset expansion / contraction device for fixing a cable mounted on a bridge therein and absorbing expansion / contraction occurring in the bridge, among the frames constituting the offset expansion / contraction device. The structure of the frame that connects the frame and the frame of the apex is that one side of the member passing in the direction traversing the cable is completely fixed to the member passing in the cable laying direction, and the other side is the member passing in the cable laying direction. It is a bridge-mounted cable offset expansion and contraction device that is not fixed but placed on top of it. Also, among the members that are passed in the cable laying direction of the frame that connects the frame of the valley and the frame of the apex,
A bridge-mounted cable offset expansion / contraction device in which a sliding plate is fixed so as to be sandwiched by both members on a member on which a member passing in a direction traversing the cable is fixed without being fixed.

[0007]

Therefore, according to the present invention, since the rotary connecting portion of the conventional device is omitted, the assembling time can be shortened. Further, since the number of parts is reduced, it is possible to reduce the cost, and further, the completely fixed structure improves the strength as compared with the rotary connection structure and is solid.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the structure of an offset expansion / contraction device according to an embodiment. That is, the offset expansion / contraction device is similar to the conventional offset expansion / contraction device shown in FIG. 4, and has left and right valley frames 1 and 5, a central apex frame 3 and frames 2, 4 connecting these frames.
It is composed of five frames. These five frames are
The frame 2 is connected by a rotatable connecting portion 6 by a connecting pin.
Among the members 2a, 2b, 4a, 4b which the members 2c, 4c passing in the direction traversing the cable pass in the cable laying direction, 4 is completely fixed to the members 2b, 4b on one side and the members 2a, 4a on the other side. The structure is such that the sliding plate 10 fixed on the members 2a and 4a is placed thereon. The details are shown in the sectional view of FIG.

That is, the members 2a for passing in the cable laying direction,
A member 2 for passing a cable across the cables 2b and 4a, 4b via a sliding plate 10 and a spacer 11.
Only one of c and 4c is placed on the sliding plate 10 which is a low friction member, and the other is completely fixed by the bolt 12 via the spacer 11.

Therefore, when a contracting force indicated by an arrow is applied to the right valley frame 5 as shown in FIG.
Sliding plate 1 on one side of the members 2a, 4a for which the members 2c, 4c for passing in the direction traversing the cable pass in the direction of laying the cable
Slide on 0 to transform. The cable 7 is laid in this expansion / contraction device, and in the frame 3 of the center offset apex and the frames 1 and 5 of the left and right valleys, the offset apex and the straight line transition portion are fixed by the fixing cleat 8 shown in FIG. ing. That is, the rotary cleat 9 shown in FIG. 6 is omitted in this example and has a structure not used. It should be noted that the members 2c and 4c passing in the direction traversing the cable are the members 2a and 4c passing in the cable laying direction at the maximum extension of the bridge.
Of course, it is necessary to design the length so as not to deviate from a.

In the above embodiment, the members 2c, 4c for passing the cable in the transverse direction and the member 2 for passing in the cable laying direction are provided.
Although one member of b and 4b is completely fixed, and members 2a and 4a that pass in the cable laying direction on the other side are slidable, this structure may of course be reversed. Further, although the rotary cleat 9 used in the conventional offset expansion and contraction device shown in FIG. 4 is omitted in this embodiment, if this is installed, only the members 2c and 4c to which the rotary cleat 9 is attached are Member 2
It is necessary to leave the rotary connection part 6 with a, 2b, 4a, 4b. This is because in the case of a fixed structure, the position of the inflection point shifts when the offset expansion / contraction device expands / contracts.

[0012]

As described above, according to the bridge bridge cable offset expansion / contraction device of the present invention, the rotational coupling portion is reduced as much as possible and the structure is completely fixed, so that the assembly is easy.
Moreover, the assembly time can be shortened. Moreover, since the number of parts can be reduced, there is an effect of cost saving. Furthermore, the strength is stronger than that of the rotary connection structure.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of an offset expansion / contraction device according to an embodiment of the present invention,

FIG. 2 is a cross-sectional view showing a detailed configuration of the offset expansion / contraction device shown in FIG.

FIG. 3 is a plan view showing a state where the offset expansion / contraction device of FIG. 1 receives a contraction force;

FIG. 4 is a plan view showing the configuration of a conventional offset expansion / contraction device,

5 is a cross-sectional view showing the fixed cleat of FIG. 4,

6 is a cross-sectional view showing the rotary cleat of FIG. 4,

FIG. 7 is a plan view showing a state where the offset expansion / contraction device in FIG. 4 receives a contraction force.

[Explanation of symbols]

 1,5 Valley frame 2,4 Frame connecting the valley frame and the apex frame 2a, 2b, 4a, 4b Cable laying member 2c, 4c Cable crossing member 3 Apex frame 6 Rotational connection part 7 Cable 8 Fixed cleat 9 Rotating cleat 10 Sliding plate 11 Spacer

Claims (2)

[Claims] 1. An offset expansion / contraction device for fixing a cable bridged to a bridge therein and absorbing expansion / contraction occurring in the bridge, wherein a frame of a valley and a frame of an apex are included in a frame constituting the offset expansion / contraction device. The structure of the knotting frame is such that one side of the member passing in the direction crossing the cable is completely fixed to the member passing in the cable laying direction, and the other side is not fixed to the member passing in the cable laying direction and placed on it. The bridge extension cable offset expansion and contraction device, which has a different structure. 2. Of the members for passing in the cable laying direction of the frame connecting the valley frame and the apex frame, a member for mounting the member for passing in the direction traversing the cable without fixing it is sandwiched by both members. 2. The bridge-extended cable offset expansion / contraction device according to claim 1, wherein the sliding plate is fixed in such a manner that the sliding plate is fixed.