JPH0946840A - Method of passing cable or the like through conduit line and removing it by elastic roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of passing a cable, a vinyl pipe or the like through an underground conduit line in which extension can be made without a cable or the like being expanded nor scratched, and particularly, excessive tension is not applied to a cable or the like even when it passes through the bent part of a conduit line and therefore the cable or the like is not damaged. SOLUTION: A pair of elastic rollers 6a with a compressed gas filled in the hollow part are provided on the ground in the side of a manhole or the like at one end of an underground conduit line, and a cable or the like is held between the pair of elastic rollers 6a and the pair of elastic rollers 6a are rotated to force the cable or the like into the conduit line 2 through a flexible guide tube 9 provided as far as the opening of the conduit line in the manhole 3 or the like from the place, and a pair of the same elastic rollers 6a as mentioned above provided on the ground in the side of a manhole 4 or the like at the other end of the conduit line 2 are rotated to hold the cable or the like between them to pull it out from the conduit line 2. A lubricant is supplied to the outer circumference of a cable or the like on this side of the opening of a conduit line on the forcing side to insert the cable or the like through the conduit line from its one end to its other end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring method for inserting a communication cable or vinyl pipes from one end to the other end in a buried pipeline and a removal method for removing a cable or the like from the pipeline.

[0002]

2. Description of the Related Art Conventionally, when another cable is inserted into an existing buried conduit in which cables are laid, a rod is conventionally inserted from both ends of the conduit and tangled in the middle. A rope is attached to the back of the cable, and a cable is attached to the end of the rope. Also, as a method of laying an electric wire in a buried conduit, it is common to draw a cable with a rope of a traction tool using an axle winch drum.

[0003]

However, in the case of towing using an axle winch drum as in the past, only ropes, wires, etc. that can be wound can be used, and FRP rods, carbon rods, etc. can be wound. Things that cannot be turned cannot be used. The axle winch drum is
There is room for improvement in that the hand strength is essential.
Vinyl pipes are often made of polyvinyl chloride, and tend to soften due to temperature rise due to heat generated during high temperatures in summer or during transmission lines in buried conduits where power cables are laid, and stretch and deform when pulled from one side And it is easy to collapse against lateral pressure. Also, when a conventional caterpillar type traction machine is used, too much side pressure is applied and the vinyl cable is crushed. Therefore it is difficult to lay.

[0004] Further, when trying to put vinyl pipes into a buried pipeline in which a power cable is already laid and towed, the pipe penetrates into a gap between the inner wall of the buried pipeline and the power cable, etc., and has a large resistance and is easily laid. Can not. The inside of the manhole and handhole at both ends of the buried pipeline is very narrow, and it is difficult to secure a place to install equipment for pushing and pulling out. When laying or removing the power cable or communication cable, fix the rope to the power cable or communication cable, pull it to a certain length with a winch, fix the rope again to the cables, and use the winch. You have to repeat the work of towing. In this case, since there is a possibility that an abnormal tensile load may be applied to the cables due to the pulling from one side, there is a problem in quality, which is very dangerous in construction.

Therefore, in the present invention, when a cable or vinyl pipe is passed through these buried pipelines, the cable can be extended without being stretched or damaged, and in particular, even when passing through a bent portion of the pipeline, An object of the present invention is to solve the above problems by providing a method of passing a wire through a buried pipeline and a method of removing the cable from which excessive tension is not applied and a cable or the like is not damaged.

[0006]

According to the first aspect of the present invention, there is provided a method of connecting a communication cable or vinyl pipes to a buried pipeline, which is provided at a side of a manhole or the like at one end of the buried pipeline. A pair of elastic rollers with compressed gas filled in the hollow portion are provided on the ground, and the elastic rollers of the pair are clamped by the elastic rollers of the pair to rotate the elastic rollers of the pair, and the duct opening in the manhole or the like from that location. Push the above cables etc. into the pipeline through the flexible guide tube that has been installed up to
Also, by rotating a pair of elastic rollers having a hollow portion filled with compressed gas provided on the ground beside the manhole at the other end of the pipeline, the cable or the like is clamped and pulled out from the pipeline, and the pushing side is inserted. Before the conduit opening, a lubricant was supplied to the outer circumference of the cable or the like so that the cable or the like was inserted from one end to the other end of the conduit.

Further, in the invention of claim 2, in the method of removing the communication cable or the vinyl pipes from the buried pipeline, on the ground beside the manhole at one end of the buried pipeline,
Providing a pair of elastic rollers filled with compressed gas in the hollow part,
The pair of elastic rollers holds the cable or the like to rotate the pair of elastic rollers, and pulls out the cable or the like in the conduit through the flexible guide tube provided from the location to the conduit opening in the manhole or the like. By rotating a pair of elastic rollers having a hollow portion filled with compressed gas provided in a manhole or the like at the other end of the pipeline, the cable or the like is clamped and pushed into the pipeline, and the cable or the like is removed from the pipeline. The method of removing the cable etc. from the inside of the pipeline by elastic roller was adopted.

[0008]

According to the first aspect of the present invention, since the pair of elastic rollers provided at both ends of the pipe line are formed by filling the hollow portion with compressed gas, the elastic rollers are dented at the contact points with the cables. And envelop the cables and hold them. Then, when the pair of elastic rollers is rotated in this state, the cables can be fed or pulled. Therefore, the contact area between each elastic roller and the cables is large, and the cables can be sent out without damaging the cables. Further, these cables are pushed into the pair of elastic rollers at the entrance of the pipeline, and are pulled by the pair of elastic rollers at the exit of the pipeline, and the cables travel in the pipeline.
In addition, in this method, the tip of the cable at the curved part of the conduit moves meandering while alternately hitting the outer inner wall and the inner inner wall, so that the lateral pressure is dispersed, and the effect of back tension and cable weight is increased. It seems that there is no such thing, and the cable side pressure at the bend of the pipeline is almost negligible. Moreover, since the outer circumference of the cables is coated with a lubricant, the buckling of the cables in the conduit is extremely small.

Each elastic roller of the invention of claim 2 has the same function as that of the invention of claim 1. Further, the cables are pushed into the pair of elastic rollers at the rear end of the conduit and are pulled by the pair of elastic rollers at the front end of the conduit, so that the cables move in the conduit. In addition, in this method, the tip of the cable at the curved part of the conduit moves meandering while alternately hitting the outer inner wall and the inner inner wall, so that the lateral pressure is dispersed, and the effect of back tension and cable weight is increased. It seems that there is no such thing, and the cable side pressure at the bend of the pipeline is almost negligible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for passing a cable or the like of the present invention and an apparatus used for the method will be described below with reference to the drawings. FIG.
2 shows a first embodiment of the present invention, in which buried manholes 3 and 4 are provided at both ends of a buried pipe 2 having a constant depth from the ground surface 1, respectively. An existing power cable 5 is laid inside. One of these, the buried manhole 3 on the pushing side of the cable duct
A pair of elastic rollers 6a on the ground surface 1 near the entrance of the
The elastic roller device 6 having the above is provided, and the drum 8 around which the electric wire cable duct 7 is wound is installed behind the elastic roller device 6. Then, it is introduced from near the elastic roller device 6 into the embedded manhole 3 on the push-in side, and the conduit 2 in the embedded manhole 3 is introduced.
A flexible guide tube 9 is installed up to the entrance.

On the other hand, an elastic roller device 6 having a pair of elastic rollers 6a is provided on the ground surface 1 near the entrance of the buried manhole 4 on the drawer side. Further, a plurality of guide rollers 10 are provided in the buried manhole 4 and near the entrance. These can also be performed by providing the flexible guide tube 9. Each elastic roller 6a of the elastic roller device 6
As shown in FIGS. 3 and 4, has an airtight outer shell 6b made of an elastic material having a large friction coefficient, for example, a rubber material,
A hollow portion inside thereof is filled with compressed gas such as compressed air, and a shaft 6c penetrates the center of each outer shell 6b. Then, two elastic rollers 6a are arranged in parallel so as to face each other, and each shaft 6c and the outer shell 6b integral with the shaft are rotated by an appropriate driving source, and the outer shell 6b is dented to form a cable or the like. It is designed to hold.

Then, a rope and a messenger rope are passed through the conduit 2 from the buried manhole 3 or 4 by using a rod or the like, and the electric wire cable duct 7 fed from the drum 8 is connected to one end of these. Then, first, the pair of elastic rollers 6a of the push-in side elastic roller device 6 is rotated by an appropriate driving device to clamp the electric wire cable duct 7 between these elastic rollers 6a, and the pipe of the embedded manhole 3 is inserted through the flexible guide pipe 9. Push it into the entrance of Road 2. At that time, a hole is formed at an appropriate location of the flexible guide tube 9, an appropriate lubricant is poured from this hole, and the lubricant is applied to the outer periphery of the electric wire cable duct 7 passing through the hole. On the other hand, in the buried manhole 4 on the outlet side of the pipeline 2, the pipeline 2
The messenger rope or the electric wire cable duct 7 that has passed through is passed through the guide roller 10 and held by the pair of rotating elastic rollers 6a of the elastic roller device 6 to pull the electric wire cable duct 7.

Further, the elastic roller devices 6 and 6 of each pair make the rotation of the rollers variable speeds, the pushing side and the pulling side communicate with each other by radio or the like, and are synchronously operated at the same speed at the initial stage of laying. The push-in side elastic roller device 6 and the pull-side elastic roller device 6 are respectively provided with load cells 6d, and the load cells 6d are operated while monitoring each of these load cells 6d, and the pull-side load cells rise above a predetermined upper limit value. In such a case, the pushing load is increased by increasing the speed on the pushing side, and as a result, the load on the pulling side is reduced, and the laying operation is performed below the upper limit value.

The pair of elastic rollers 6a of each elastic roller device 6 holds the electric wire cable duct 7 by denting the outer shell and enclosing the electric wire cable duct 7 to push or pull the electric wire cable. 3 and 4 show a state in which the electric wire cable duct 7 is sandwiched and inserted between the elastic rollers 6a of these pairs.

Next, FIGS. 5 and 7 show a second embodiment of the present invention. The construction of this embodiment is almost the same as that of the first embodiment, but the elastic roller device 6 and the drum are used. 8 is loaded in the vehicle. In addition, a cable 13 has already been laid in the pipeline 12 through which the intended sub-duct 11 passes.

Explaining the construction method of the second embodiment, the drum 8 and the elastic roller device 6 around which the sub-duct 11 is wound.
The vehicle 14 carrying the
The vehicle 16 having the elastic roller device 6 and the messenger rope winding drum 15 placed on the opening of the other buried manhole 4, i.e., the winch field, is arranged. Then, compressed air is passed from the compressor wheel 17 to the pipeline 12 from the drum field, and the nominal line 18 is passed by a spiral flow. As shown in FIG. 5, a spiral flow parachute 19 projects into the buried manhole 4. Then, the messenger rope 20 is bound to the call line 18 passing through the winch field, and the call line 18 is drawn to the drum field by the elastic roller devices 6 and 6, whereby the messenger rope 20 is passed through the pipe line 12.

The tip of the sub-duct 11 is connected to the messenger rope 20 that has passed through to the drum field, and the sub-duct 11 is fed from the drum 8 and pushed into the pipe line 12 by the elastic roller device 6 in the drum field, and at the same time, the winch. Elastic roller device 6 in place for messenger rope 2
0, and then the sub-duct 11 is pulled. This is shown in FIG.

Next, an experimental example of the present invention will be shown. In this experiment, the case where the sub-duct was pushed from one end of the pipeline and the case where the sub-duct was pulled (or pulled) from the other end at the same time was compared with the case where the lubricant was applied and the case where the lubricant was not applied. The pipe used for this experiment has an inner diameter 1
The pipeline is 30 to 131 mm, and the sub-duct is inserted into the pipeline of 200 m from the point B to the point A of the pipeline. Also, there are 3 curve points, 10 mmR
There are 2 curved portions and 5 mmR curved portion is 1. The results are shown in Table 1. The measurement points in Table 1 are the first 10mR center point (32m point) from the B point, the second 10mR center (64m point) from the B position, and the 5mR center point (76m point) from the B point. Indicates a position (point 142 m) in a straight line direction 60 m from the point B starting from point 5 mR (position 142 m) from point B to end point A (point 200 m). The results of this experiment are shown in Tables 1 and 2.

As is clear from Table 1, the ball roller (elastic roller) of the rotation-fixed EB150W motor at point B on the pushing side and the rotation variable type EB1 at point A on the retracting side.
The sub-duct was inserted using a ball roller with an 80 SV motor, but 200 m if no lubricant was applied.
At the point, the pushing force was 150 kgf and the pulling force was 80.0 kgf. The insertion time is 21 minutes 1
It takes 2 seconds. And the sub-duct is pushed in a buckled state.

[0020]

[Table 1]

Also, at the point B on the pushing side, the variable rotation type E
Ball roller (elastic roller) of B180SV motor and EB150W motor 2 of rotation fixed type at point A on the retracting side
The sub-duct was inserted using a ball roller (elastic roller) with a table, but if the lubricant is not applied, the first time can be inserted only up to 84m point, and the pushing force is 60k.
gf, and the retraction force was 150 kgf.
The insertion time at that time is 13 minutes and 38 seconds. In addition, the second time can be inserted only up to 87m, the pushing force is 70k
gf, and the retraction force was 150 kgf.
The insertion time at that time is 12 minutes and 42 seconds. In all of these cases, the ball roller slips.

Next, Table 2 shows the case where a lubricant is applied. At point B on the push-in side, the ball roller (elastic roller) of the rotation-adjustable EB180V motor is moved to point A on the pull-in side.
At each point, the sub-ducts were inserted using the ball rollers (elastic rollers) of two rotation-fixed EB150W motors, respectively, but the point A reached 200 m, and the pushing force there was 23 kgf and the pulling force. Was 29 kgf. Insertion time at that time is 21 minutes 27
Seconds.

[0023]

[Table 2]

If a lubricant is not applied to the sub-duct thus inserted, it is extremely difficult to pass it through a 200-meter pipeline, and even if it is passed through, it will be 150 k on the pushing side.
Although a force of 80 kgf is required on the gf side and the pulling side, it can be seen that when a lubricant is applied, they can be inserted with a force of about 23 kgf and 29 kgf, respectively. At the same time, when pulling on the other side, by applying a lubricant to the cables or sub-ducts to be inserted, it is possible to insert the cables or the like into the conduit with an extremely small force.

In the above embodiment, this construction method was described for the electric wire cable duct and the sub-duct. However, when the cable is passed through these ducts, or when vinyl pipes or the like is passed instead of the above duct, it is appropriate. It can be applied to ducts, pipes, and cables. Further, in each of the above-described embodiments, the case where the existing power cable 5 or the cable 13 is provided in the pipelines 2 and 12 is shown, but when the existing cable is not arranged,
The same applies. Further, in the above embodiment, the description has been given of the passage of the cables and the like to the pipelines, but the removal from these pipelines also involves pulling the cables and the like at one end of the pipelines and the cables and the ropes and the like connected to them at the other end. It can be removed smoothly by pushing it in.

[0026]

According to the first aspect of the present invention, when laying communication cables or vinyl pipes in a pipeline, the cables are pushed in from one end of the pipeline and pulled at the other end of the pipeline. To pass through wires, tension on cables, etc.
In particular, no back tension is applied, and therefore these cables and the like can be laid without being deformed, and bite into the gap between the existing cables and the like in the pipeline and the inner peripheral wall of the pipeline is eliminated. In addition, since the pair of elastic rollers holds the cables and the like by pushing and pulling these cables,
These elastic rollers filled with compressed gas wrap the cable and the like softly so that the surface of the cable and the like is not damaged or crushed. In addition, a flexible guide tube is provided between one of the entrances of the buried pipeline and the elastic roller device, and the cables etc. passing through this are pushed in, so that it is necessary to push or pull into a narrow buried manhole or handhole. There is no need to install equipment.

Also in the method of removing the cables and the like from the invention according to claim 2, the cables and the like can be removed without applying a tension, particularly a back tension, to the cables and the like without deforming them. At the same time, it has the same effects as the invention of claim 1 above, such that there is no bite into the gap between the existing cable or the like in the pipeline and the inner peripheral wall of the pipeline, and there is no risk of damaging the existing cable or the like.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a schematic configuration of a first embodiment of the present invention.

FIG. 2 is a schematic plan view showing a schematic configuration of a first embodiment of the present invention.

FIG. 3 is a front view of a cable duct held between a pair of elastic rollers according to the first embodiment of the present invention.

FIG. 4 is a plan view of a cable duct held between a pair of elastic rollers according to the first embodiment of the present invention.

FIG. 5 is a schematic front view showing a state in which a nominal line according to a second embodiment of the present invention is passed through a pipeline.

FIG. 6 is a schematic plan view showing a state in which a nominal line according to a second embodiment of the present invention is passed through a pipe line.

FIG. 7 is a schematic front view showing a state in which a sub-duct is connected to a messenger rope in the second embodiment of the present invention and the sub-duct is passed through a pipeline.

FIG. 8 is a schematic view showing a shape of a pipe line and the like in an experimental example of the present invention.

[Explanation of symbols]

1 Ground Surface 2 Pipeline 3 Buried Manhole 4 Buried Manhole 6 Elastic Roller Device 6a Elastic Roller 6c Shaft 7 Electric Cable Cable Duct 9 Flexible Guide Pipe 11 Subduct 12 Pipeline 14 Vehicle 16 Vehicle

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Fujimoto 4-9-25 Shibaura, Minato-ku, Tokyo Tokyo Communication Network Co., Ltd. (72) Inventor Shizuo Nishigaki 4-24-15 Sendagaya, Shibuya-ku, Tokyo Higashi Yoko Rubber Industry Co., Ltd. Tokyo branch office (72) Inventor Tadayoshi Nagumo 4-83-3 Shibaura, Minato-ku, Tokyo Kandenko Co., Ltd. (72) Inventor Masayuki Otomo 4-83-3 Shibaura, Minato-ku, Tokyo Kandenko Co., Ltd.

Claims (2)

[Claims] 1. In a method of passing a communication cable or a vinyl pipe to an embedded pipeline, a pair of elastic members in which a hollow portion is filled with compressed gas on the ground beside a manhole at one end of the embedded pipeline. A roller is provided, and the pair of elastic rollers hold the above cable or the like to rotate the pair of elastic rollers, and through the flexible guide pipe provided from that location to the conduit opening in the manhole or the like, the above cable or the like is inserted into the conduit. Pushing or rotating the pair of elastic rollers having a hollow portion filled with compressed gas provided on the ground beside the manhole or the like at the other end of the pipeline, hold the cable or the like and pull out from the pipeline, A lubricant is supplied to the outer periphery of the cable or the like before the conduit opening on the pushing side to insert the cable or the like from one end to the other end of the conduit. Pipe line construction method. 2. A pair of elastic rollers having a hollow portion filled with a compressed gas on the ground beside a manhole or the like at one end of the buried pipeline in the method of removing a communication cable or vinyl pipes from the buried pipeline. The pair of elastic rollers holds the cable or the like and rotates the pair of elastic rollers, and pulls out the cable or the like in the pipeline through the flexible guide pipe provided from the location to the duct opening in the manhole or the like. In addition, by rotating a pair of elastic rollers having a hollow portion filled with a compressed gas provided in a manhole or the like at the other end of the pipeline, the cable or the like is clamped and pushed into the pipeline to remove the cable or the like from the pipeline. A method of removing cables and other pipes by elastic rollers, which is characterized by removing them.