JP3256463B2 - Cable laying apparatus and cable laying method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable laying apparatus and a cable laying method for efficiently laying a communication cable such as an optical cable and a metal cable underground or on the ground or in the air.

[0002]

2. Description of the Related Art Conventionally, a cable laying method of laying a pipe such as a steel pipe or a fume pipe and inserting a plurality of cables through the pipe is performed by disposing a hard vinyl pipe in a pipe laid in a tunnel. And a series of steps of drawing a cable into the hard vinyl tube are repeated. FIG.
1 shows a conventional cable laying method and a state of a laid cable in a pipeline. A pipe 52 is laid between the starting manhole 50 and the reaching manhole 51, and a plurality of hard vinyl pipes 53 are disposed in the pipe 52, and a state in which the cable 54 is inserted therein is apparent. (FIG. 9B (XX sectional view)). In addition, 55 is a cable feeding device, and 56 is a cable pulling device.

[0003]

As described above, conventionally, a method of arranging the hard vinyl pipes 53 and inserting a cable into each hard vinyl pipe 53 is adopted. Cables can be laid only in the number of hard vinyl pipes 53 that can be arranged in the cable. Therefore, when the number of cables is insufficient, a new pipeline must be installed. However, such a situation may frequently occur with an increase in the amount of information. However, the construction of new pipelines and the laying of cables required a great deal of expense and was a problem to be solved.

[0004] The present invention is proposed to solve the above-mentioned problems, but uses a pipeline of the same diameter as the conventional one, but uses the space in the pipeline efficiently and dramatically increases the number of cables to be laid. It is an object of the present invention to provide a cable laying device and a cable laying method.

[0005]

According to a first aspect of the present invention, there is provided a cable laying apparatus according to the first aspect of the present invention, wherein a cable conduit having a cable insertion slit formed in a cable insertion direction is provided. A jig for pushing out the cable from the cable insertion / removal slit, and a cable rack for fixing the pushed-out cable are provided, and the jig is provided at a tip of a main body formed to have a diameter slightly smaller than the inner diameter of the conduit. A tow hook is attached, and a cutout portion is formed which gradually becomes shallower in a required range from the front end of the main body to the rear end, and is pulled from one end side to the other end side of the conduit tube, It is characterized in that the cable is pushed out of the cable insertion / removal slit from the cable portion joined to the notch.

According to a second aspect of the present invention, there is provided a cable laying method using the cable laying device according to the first aspect, laying a pipeline such as a steel pipe or a fume pipe, and installing a plurality of cables in the pipeline. In the method of laying the cable to be inserted,
After laying the conduit provided with the conduit, a cable is inserted through the entire length of the conduit through a traction rope, and after the cable insertion is completed, the jig is moved from one end to the other end of the conduit. By pulling the cable to the side, a series of steps of pushing out the cable from the cable insertion / removal slit, taking out the cable from the conduit, and placing the cable in the cable rack are repeated.

According to the cable laying device of the first aspect, a cable is not drawn in to one hard vinyl tube as in the prior art, but instead of the cable laying method of the second aspect. Since only the cable can be drawn through the conduit, the number of cables that can be drawn into the laid pipe can be dramatically increased. Moreover, since a plurality of cables can be taken out from the conduit and fixed at an arbitrary position via a cable rack as in the cable laying method according to the second aspect, cable management can be easily performed.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. The following is an embodiment in which a cable is laid underground and further removed, but the same applies to a case where the cable is on the ground or in the air. FIG. 1 shows an operation of excavating a ditch from the ground with an excavator 1 and performing mountain retaining (operation for preventing collapse of a ditch wall surface). Unlike this work, there is a method of excavating two shafts, the starting shaft and the reaching shaft, from the ground, and forming a tunnel between the two shafts. The method of excavation is taken.

In this way, the trench is excavated from the ground, and the depth of the trench is different between a manhole installation location 2 described later and a pipeline installation location 3. That is, the pipe installation location 3 is excavated shallower than the manhole installation location 2. Therefore, a deep excavated portion and a shallow excavated portion are appropriately formed in the groove bottom in the groove length direction. Also, in the process of excavating the trench, mountain retaining is performed. In the mountain retaining, a plurality of sheet piles (earth retaining piles) 4 are arranged side by side in the groove length direction along the steep groove wall so that the lower ends thereof are inserted into the ground. further,
An abdomen 5 is arranged at the upper, interrupted position so that the plurality of sheet piles 4 are pressed against the groove walls. FIG. 1 shows a state in which a plurality of sheet piles 4 are pressed against one groove wall in this manner, but a plurality of sheet piles 4 are also pressed against the facing groove wall. Further, the cutting beam 6 is passed to the facing belly upright 5 so that the temporary material does not fall into the groove.

Next, as shown in FIG. 2, a pipeline 8 is suspended from the ground via a crane truck 7 at the pipeline installation location 3 in the excavated trench. The conduit 8 is provided with a conduit 9 through which a cable can be freely inserted and removed, and a conduit (a first line) in which a rack 10 for fixing a cable is attached at an end.
Conduit) and a conduit 9 through which cables can be inserted and removed.
There is a pipeline (second pipeline) provided only with the second pipeline. FIG.
A suspends the second pipeline 8b, and then suspends the first pipeline 8b.
This shows a state in which a is to be made to follow. When both pipelines are tandemly connected, the conduits 9 are connected to each other. 11
Indicates a connection point. When the connection between the conduits 9 is completed, the conduits are connected.

In this way, the required pipelines are connected one after another to form a series of laid pipelines as shown in FIG. 2B. Reference numeral 12 denotes a connection point of the pipeline. The pipeline 8x is in the form of a first pipeline provided with a cable-fixing rack 10x at the end. After the pipeline is laid, the manhole is built at the place where the manhole is installed, and the manhole may be installed at the same time as the installation of the pipeline. Alternatively, manhole installation may be performed first. In any case, the first pipeline is a pipeline connected to the built manhole, and the rack 10 is located at this connection location.

FIG. 3 shows a pipe 8a at a pipe installation location 2 in the groove.
~ 8x, manhole 1 at manhole setting location 3
3 and a state in which the intermediate manholes 14a to 14x are arranged, and the pipeline is a series of laid pipelines via each manhole. In addition, manholes will be divided into factory-manufactured products, transported to the site, and assembled and installed at the site. Needless to say, the number of manholes and the number of pipelines are determined by the construction plan.

Next, the temporary material such as the sheet pile 4 for the mountain retaining is removed, and the soil is buried in the excavated portion (FIG. 4). When the excavated portion is almost restored, the towing rope is pulled into the conduit pipe. FIG. 5 shows this work situation, in which a tow rope 16 prepared on the ground is used.
The robot 15 is held at the end of
5 is moved toward the manhole 13 from the passage opening on the side of the intermediate manhole 14c and drawn out into the manhole 13.
The pulling of the tow rope may be performed at the stage of laying the pipeline shown in FIG. In this case, the pipelines are connected while pulling the traction ropes into the conduits of the individual pipelines.

Next, as shown in FIG. 6, a cable 18 is inserted through a series of conduits via a cable feeder 16 and a cable puller 17. More specifically, the tow rope 16 and the cable 18 fed from the cable feeder 16 are connected in the intermediate manhole 14c, and the cable puller 17 is operated to pull the cable 18. In this case, the cable 18 is towed toward the manhole 13 via the intermediate manholes 14b and 14a so as to trace the rear of the tow rope 16. When the first cable 18 is towed, a tow rope 16 for towing the second cable 18 is connected to an end of the first cable 18. Therefore, the second tow rope 16 is inserted into the pipeline along with the first cable 18.

Next, the inserted cable is removed from the conduit, and is fixed to a cable rack. FIG. 7 shows the cable 1 immediately before being drawn into the conduit 9 and pushed out.
8a and a state in which the cable 18b removed from the conduit 9 is fixed to the cable rack 10. As is clear from FIG. 7B when the conduit 8 is viewed from the front, the cables 18 detached from the conduit 9 are successively set in the cable rack 10. In this case, between the cable racks 10, the cables 18 b hang down so as to contact the inner wall of the pipeline 8. FIG. 7C is a sectional view taken along line XX in FIG. 7A, and shows a state where three cables 18b are fixed.

Next, a laying apparatus used in the above cable laying method will be described. The conduit 9 for drawing the cable 18a into the conduit 8 is fixed via a support 19 fixed to the inner wall of the conduit 8 as shown in FIGS. 7A and 7B. A cable insertion / removal slit 20 extending in the cable insertion direction is formed in the conduit tube 9. The opening angle and opening direction of the cable insertion / removal slit 20 may be set as appropriate. In the embodiment, the opening angle is 90 degrees and the opening direction is the upper left side in FIG. 7C.

Since the cable is inserted inside the conduit 9 while sliding, the cable 9 is inserted to reduce sliding friction.
It would be effective to apply a Teflon coating or the like to the inner wall of the device. By the way, when the cable is an optical fiber, it is very important to pull the cable as much as possible without frictional resistance, since applying a tensile force of 200 kg or more will damage the optical fiber. The cable 18a inserted into the conduit 9 configured as described above
Is pushed out of the cable insertion / removal slit 20 through the jig and into the pipeline 8, and the jig is configured as shown in FIG.

FIG. 8A shows the jig 21 movably inserted into the conduit 9, and the main body diameter is the inner diameter L of the conduit 9.
It is formed to have a slightly smaller diameter and has a tow hook 22 at its tip.
Is attached. Further, a notch 23 is formed in a required range from the front end of the main body to the rear end. The notch 23 is formed to be shallower as the front end portion of the main body is deepest and closer to the rear end, and is joined to the outer peripheral surface of the cable as described later. Further, a square projection 24 for preventing rotation is formed near the rear end of the main body and opened in a 90-degree direction. The square projection 24 has a notch 23 corresponding to the cable insertion / removal slit 20. It does not move out of position.

The cable 18a is taken out of the cable insertion / removal slit 20 of the conduit tube 9 through a series of operations shown in FIGS. 8B to 8F (a view of the jig as viewed from the front). First, a jig having a shape as shown in FIG. 8A is inserted into the conduit 9 from one end side of the conduit 9 (for example, the outlet side of the inserted cable 18a). At this time, the position of the notch 2 is adjusted while rotating the jig so that the horn-like projection 24 is joined to the inside of the open end of the cable insertion / removal slit 20 so as to protrude from the cable insertion / removal slit 20.
3 corresponds to the cable insertion / removal slit 20. When the jig is inserted into the wire tube 9 in this manner, the cable 18a
Are received in the cutouts 23 and joined. FIG. 8B
Is a diagram showing this stage.

Next, when the jig is pulled through a tow rope (not shown) connected to the tow hook 22, the cable 18a is gradually cut out of the notch 23 as shown in FIGS. 8C to 8E. It can be pushed up to a shallow groove. At the same time, the other part of the cable 18a is located as shown in FIG. 8B, and the part gradually shifts as shown in FIGS. 8C to 8E. Eventually, the cables 18a are sequentially pushed out from the cable insertion / removal slits 20 as shown in FIG. 8F, and the entire cable 18a is taken out from the conduit tube 9.

The conduit is provided with a cable rack 10 as shown in FIG. 7A. Here, for convenience of illustration, three cables 18b are fixedly arranged in three stages, however, the larger the number of fixed cables 18b, the better, and the shape of the cable rack 10 will be appropriately designed. Therefore, the cable 18b taken out of the conduit 9
Are set on the cable rack 10 by the hands of the workers entering each manhole. Therefore, the cable 18b can be set at an arbitrary position on the cable rack 10. Note that the cable rack 10 may be provided inside the manhole.

[0022]

As described above, according to the present invention, one cable is not drawn in to one hard vinyl tube as in the prior art, but only the cable is drawn in through the conduit. The number of cables that can be drawn into the cable can be dramatically increased. In addition, since the cables can be fixed at arbitrary positions via the cable rack, cable management can be easily performed.

[Brief description of the drawings]

FIG. 1 is a work process diagram showing a state in which a trench is excavated and secured to a mountain.

FIG. 2 is an operation process diagram showing an operation of hanging a pipe in a groove and connecting the pipe.

FIG. 3 is a work process diagram showing a state of pipe installation and manhole construction.

FIG. 4 is a work process diagram showing a state where temporary materials are removed and backfilled.

FIG. 5 is a work process diagram showing a state in which the tow rope is drawn into the conduit tube.

FIG. 6 is a work process diagram showing a state of cable pulling.

FIG. 7 is an enlarged view, a front view, and an XX cross-sectional view of a work process showing a state of cable pulling.

FIG. 8 is a work process diagram showing a state in which a cable is taken out using a jig.

FIG. 9 is a cross-sectional view showing a conventional cable pull-in operation and a laying state in a steel pipe.

[Explanation of symbols]

 Reference Signs List 8 conduit 9 conduit 10 cable rack 18a cable 19 support 20 cable insertion / removal slit

Claims (2)

(57) [Claims] 1. A conduit tube having a cable insertion / removal slit formed in a cable insertion direction, a jig for extruding a cable from the cable insertion / removal slit after completion of cable insertion, and a cable rack for fixing the extruded cable. The jig is provided with a traction hook at the tip of the main body formed to have a slightly smaller diameter than the inner diameter of the wire conduit, and becomes gradually shallower to a required range near the rear end from the main body tip. A notch portion is formed, and the cable is pushed from one end side to the other end side of the conduit so that the cable is pushed out of the cable insertion / removal slit from the cable portion joined to the notch portion. A cable laying device, characterized in that: 2. A method of laying a pipe such as a steel pipe or a fume pipe and inserting a plurality of cables through the pipe, after laying the pipe provided with the conduit. The cable is inserted from the cable insertion / removal slit by pulling the jig from one end to the other end of the communication pipe after the cable insertion is completed, and inserting the cable through the entire length of the communication pipe via a tow rope. The cable laying method using the cable laying apparatus according to claim 1, wherein a series of steps of extruding, taking out from the conduit, and placing the cable rack in the cable rack is repeated.