JPH099444A - Method and apparatus for laying cable in duct - Google Patents

Abstract

PURPOSE: To make it possible to lay a cable in a duct wherein there is water or obstables or there is a cable already laid or to lay a plurality of cable at the same time in the same duct easily. CONSTITUTION: At one end of a duct 22, a flexible tube which has the the same length as that of the duct or longer than the duct is located with its end inside out. High-pressure water is supplied between the inside-out section of the tube 10 and the tube 10 to let the tube enter the inside of the duct, the whole body turned inside out gradually. A basic end of the inserted tube is pulled out from the other end of the duct and now the entire body of the tube is inserted into the duct. Then, a cable 20 with a water-pressure wrap 23 installed at its head 20a is inserted into the tube 10 from one end of the duct. After that, high-pressure water is supplied in the tube from one end of the duct and thereby the water-pressure wrap is inserted gradually into the tube due to the supply of high-pressure water. The inserted water-pressure wrap is pulled out from the other end of the tube located at the other end of the duct. Then, compressed air is supplied into the tube to exhaust only water in the tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for laying a cable such as a telephone line, a power line or an optical fiber in a pipe using a tube.

[0002]

2. Description of the Related Art Generally, in laying cables such as telephone lines, power lines or optical fibers, the cables are inserted into a conduit such as a hard vinyl chloride pipe buried underground. As a method of laying a cable in this pipeline, for example, a pipeline formed between manholes uses a running body for passage. In the method of laying a cable in a pipeline using this running vehicle, one end of a lightweight rope is connected to the running vehicle, and the running vehicle is run from one end side of the pipeline and the other end side Pull out with one end of the lightweight rope. After that, the cable head of the cable to be laid at one end of the lightweight rope is tied, and the cable is laid inside the pipeline by pulling back the lightweight rope from one end of the pipeline. Here, there are various proposals for the running body for passage such as a method of running a plurality of piston bodies in a pipeline by air pressure or a method of rotating a roller by electric power to run in a pipeline. .

However, in the method of using the above-mentioned running body for passage, whether the vehicle is driven by air pressure or by electric power, for example, there are obstacles such as small pebbles in the pipeline, or When a cable is already laid and further cables are laid, there is a problem that the traveling body for passage cannot be advanced. In order to eliminate this point, a flexible tubular body with one end of a reinforcement body such as a string connected to the base end is arranged at one end side of the conduit, and this flexible tubular body is turned inside out by pressure fluid. While passing it through the conduit with one end of the string,
There has been proposed a method in which a cable head of a cable is tied to one end of a cord drawn out from the other end of the conduit and the cable is laid inside the conduit by pulling back the cord from one end of the conduit (Japanese Patent Laid-Open No. 2006-187242). 54-153297).

As another method, there has been proposed a method for passing through a conduit using a tube (Japanese Patent Laid-Open No. 3-7041).
1). In this method, the tube is made by arranging only the tip of the resin tube on one end side of the conduit with the tube turned upside down and supplying compressed air between the tube and the tube inside out. The tube is sequentially introduced into the pipe, and the tube is pulled out from the other end of the pipe. After connecting one end of the tow rope to the proximal end of the pulled out tube, the tow rope is pulled out to the one end side of the conduit by pulling back the distal end of the tube from the one end side of the conduit. The cable is laid in the pipeline by connecting the cable head to one end of the pulled traction rope and then pulling the traction rope to pull the cable to the other end side of the pipeline. According to these methods, even if some obstacle is present in the conduit, the flexible tubular body or the tube is deformed in accordance with the obstacle so that the tubular body or the tube can be surely moved at one end of the rope or the pulling rope. Can be carried to the other end of the pipeline.

[0005]

All the above-mentioned conventional methods use compressed air for injecting the flexible tubular body or tube into the conduit. However, when the compressed air has accumulated water in the pipeline, there is no propulsive force to push away the accumulated water, and the flexible tubular body or tube cannot be inserted through the pipeline. Also, in order to lay the cable, it is necessary to pull back the flexible tubular body etc. once inserted in the pipeline, so if there is an obstacle in the pipeline, the cable head or tow rope will hit this obstacle. There was a problem that it could not be pulled out smoothly from the pipeline. Furthermore, when laying more than one cable at a time, it is necessary to rewind the flexible tubular body etc. to the reel after the first cable laying is completed, and perform the same work again from the beginning. Laying the cables required a lot of work.

An object of the present invention is to provide a method and an apparatus for smoothly laying a cable in a pipeline having water or obstacles or in a pipeline where the cable has already been laid. It is another object of the present invention to provide a method and an apparatus for easily laying a plurality of cables in the same conduit at one time.

[0007]

The invention according to claim 1 of the present invention is, as shown in FIGS. 1 to 5, a flexible member having the same length as the conduit 22 or longer than the conduit 22 on one end side of the conduit 22. The flexible tube 10 is arranged with its tip end turned inside out, high-pressure water is supplied between this inside-out part 10a and the tube 10 (FIG. 3), and the tube 10 is turned upside down by the supply of high-pressure water so that the tube 10 Of the tube 10 is sequentially inserted into the conduit 22 (FIG. 5), and the proximal end of the invaded tube 10 is pulled out from the other end of the conduit 22 so that the tube 10 is inserted into the conduit 22 and hydraulic pressure is applied to the cable head 20a. Insert the cable 20 having the umbrella 23 attached and having the same length as the conduit 22 or longer than the conduit 22 into the tube 10 inserted from one end of the conduit 22 (FIG. 4), and position it at one end of the conduit 22. High pressure water is supplied into the tube 10 Cable 2 by sequentially entering the water pressure 受傘 23 the tube 10 within the supply of
0 is sequentially intruded into the tube 10, the intruded hydraulic pressure receiving umbrella 23 is pulled out from the tube located on the other end side of the conduit 22, and the cable 20 is inserted into the tube 10 (FIG. 1) and compressed into the tube 10. It is a method of laying a cable in a pipeline, which is characterized in that air is supplied to discharge only the water in the tube 10.

The pipeline is not limited to being buried in the ground, but can be applied to a pipeline inside a concrete building. The flexible tube is a synthetic resin tube, and examples thereof include polyvinyl chloride, polyurethane, and polycarbonate. This tube has such strength that it can be propelled in the pipeline without rupturing when water pressure is applied to the inside-out portion.
The water pressure receiving umbrella has elasticity and is made of cloth or synthetic resin. When made of synthetic resin, it is preferably a funnel-shaped molded body of soft resin made of polyvinyl chloride, polyurethane, polycarbonate, or aramid fiber. As shown in FIG. 4, a tubular portion 23a is provided in the center of a water pressure receiving umbrella 23 of a molded body in a funnel shape, the cable head 20a of the cable 20 is inserted into the tubular portion 23a, and then the band 24 is placed over the tubular portion 23a. It is preferable to tighten and fix the water pressure receiving umbrella 23 to the cable head 20a.

The invention according to claim 2 is, in the invention according to claim 1, as shown in FIG. 6, in which the base end portion of the tube 10 inserted into the conduit 22 is located on one end side of the conduit 22. It is a method of laying a cable in a pipe, which is connected to a pipe and circulates water in the tube 10. Circulating water is for efficient use of water. The invention according to claim 3 is
The invention according to claim 1 or 2 is a method for laying a cable in a pipeline, wherein the tube 10 is transparent or translucent. This is because when the cable is laid in the tube inserted into the conduit, the arrival of the cable head can be easily found at the other end of the conduit.

The invention according to claim 4 is, as shown in FIGS. 1 to 5, a high-pressure water supply device 12 having a supply port 12d for supplying high-pressure water, and a base end connected to the supply port 12d. Is installed on one end side of the conduit 22 and has a flexible tube 10 having a length equal to or longer than that of the conduit 22 or an introducing port 14 for the cable 20 in the middle thereof; And a tube fixing tool 18 for fixing the tip of the tube 10 introduced from the introduction port 14 to the tip of the tube 10 inside out. Water pressure is 0.5 to 3 kg / cm ² , preferably 1 to
It is 2 kg / cm ² . The invention according to claim 5 is an apparatus for laying a cable in a pipeline, wherein the high-pressure water supply device 12 is composed of a water tank 12a and a pump 12b for pumping water stored in the water tank 12a. The invention according to claim 6 is an aquarium 1.
2A is a cable laying device in a pipeline provided with a circulation connection port 12c for connecting the base end portion of the tube 10 inserted in the pipeline 22 to 2a. Circulating water is for efficient use of water. The invention according to claim 7 is the in-pipe cable laying device, wherein the tube 10 is transparent or translucent. This is because when the cable is laid in the tube inserted into the conduit, the arrival of the cable head can be easily found at the other end of the conduit.

[0011]

When the high-pressure water is supplied, the tube 10 is turned upside down and sequentially enters the pipe line 22. Tube 10 is conduit 22
Even if some obstacles exist inside, as long as there is a space into which the tube 10 can enter as shown in FIG. The cable 20 inserted into the tube 10 after the tube 10 is inserted into the tube 22 penetrates into the tube 10 by the movement of the hydraulic pressure umbrella 23 by the high-pressure water, whereby the cable 20 enters the tube 22. Is laid. If the water pressure receiving umbrella 23 is formed of an elastic body, even if the cable 20 already laid inside the tube 10 is present, the structure shown in FIG.
Also, as shown in FIG. 9, the water pressure receiving umbrella 23 is deformed by its elasticity and moves forward. The tube 10 after the laying of the cable 20 is left as it is in the conduit 22 for laying the next cable, or is used as a protective tube for the laid cable, or is pulled out from the conduit 22 and re-used. Used.

[0012]

An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 2, the in-pipe cable laying device 11 in this embodiment includes a high-pressure water supply device 12 and an introduction pipe 13. The high-pressure water supply device 12 is further provided with a water tank 12a provided with a circulation connection port 12c and a pump 12b for pumping water stored in the water tank 12a, and the circulation connection port 12c is a pipe line as shown in FIG. The proximal end portion of the tube 10 inserted through the inside is configured to be connectable.

As shown in FIG. 3, the introduction pipe 13 has a supply port 12d for discharging water of a pump 12b which is a high-pressure water supply device.
Is a tubular body having a proximal end connected to, and has a tubular introduction port 14 provided obliquely in the middle thereof. The introduction pipe 13 in this embodiment is provided with a female screw 13b at its base end, and the introduction pipe 13 is connected to the supply port 12d by being screwed into a male screw 12e provided in the supply port 12d. A male screw 14a is provided at the tip of the introduction port 14, and a hole 1 into which the cable or tube 10 is loosely inserted at the center of the male screw 14a.
The lid 16 provided with 6a is adapted to be screwed.
The lid 16 is screwed through a leak-proof packing 17 so that high-pressure water does not leak from the gap between the cable and the tube 10. The packing 17 is formed so as to have a smaller diameter as it advances into the introduction port 14, and the small diameter portion 17 a is in close contact with the peripheral surface of the cable or the tube 10 so that the high pressure water hole 16
It is designed to prevent leakage to a.

A tubular groove 13a is provided at the periphery of the leading end of the introduction tube 13, and the tip of the tube 10 is folded back and fixed by a band 18 which is a tube fixing tool. That is, the tube 1 introduced from the inlet 14
By inserting the tip end of 0 into the tip of the introduction pipe 13 until it goes over the groove 13a with the tip end turned outward, and tightening the band 18 as a tube fixing tool around the groove 13a via the tip end of the tube 10. The tip of the tube 10 is configured to be fixed to the tip of the introduction tube 13.

A method of laying a cable in a pipeline using the device 11 thus constructed will be described. (a) Insertion of the tube into the pipeline First, as shown in FIG. 5, the high pressure water supply device 11 is installed on the bottom of the manhole 21 facing one end of the pipeline 22 to the table 11a.
It is installed via the
A drum 10b is placed around which a slightly longer flexible tube 10 is wound. In this example, the tube 10 is made of polyvinyl chloride. After unwinding the tube 10 from the drum 10b, introducing the tip end of the tube 10 into the introduction tube 13 through the introduction port 14 as shown in detail in FIG. 3, and further fitting the tip end of the introduction tube 13 in the state of being turned upside down. , Groove 13
The band 18 is fastened around a and the tip of the tube 10 is fixed to the tip of the introduction tube 13.

Next, the pump 12b is driven to supply the water in the water tank 12a between the inside-outside portion 10a of the tube 10 and the tube 10 at a pressure of about 1.5 kg / cm ² . By the supply of this high-pressure water, the tube 10 sequentially extends while turning inside out as shown by the chain double-dashed line in FIG. 3, and sequentially enters the pipe line 22 as shown in FIG. The tube 10 wound around the drum 10b as the tube 10 enters the conduit 22.
Are sequentially fed from the introduction port 14 through the introduction pipe 13 into the pipe line 22. At this time, for example, as shown in FIG.
Even if there is an obstacle 22a such as a stone inside, the tube 10
As long as there is a space where can enter, continue to enter due to the pressure of high-pressure water. When the invading tube 10 reaches the other end side of the conduit 22, although not shown, the base end thereof is pulled out from the other end of the conduit 22 leading to another manhole 25. As a result, the tube 10 is inserted into the conduit 22. Pump 1
2b is stopped.

(B) Insertion of Cable into Tube As shown in FIG. 1, a drum 20b around which a cable 20 longer than the conduit 22 is wound is arranged next to the manhole 21 on the ground. The cable 20 is unwound from the drum 20b, and the water pressure receiving umbrella 23 is attached by the band 24 to the cable head 20a which is the tip of the cable 20 as shown in detail in FIG. The water pressure receiving umbrella 23 is an elastic body made of aramid fiber, is shaped like a funnel, and has a tubular portion 23a into which the cable head 20a can be inserted, in the central portion. Further, the large diameter portion of the hydraulic pressure receiving umbrella 23 is formed in a size corresponding to the inner diameter of the tube 10 in an opened state. In this state, the cable head 20a is introduced from the introduction port 14 to the tip of the introduction pipe 13. After the introduction, the water pressure receiving umbrella 23 opens in the introduction pipe 13 due to the elastic restoring force. When the pump 12b is driven again, the water pressure acts on the inside of the water pressure receiving umbrella 23, and the water pressure receiving umbrella 23 enters the inserted tube 10, and the cable 20 fixed to the water pressure receiving umbrella 23 also enters the tube 10. Invades one after another. The packing 17 of the introduction port 14 prevents water leakage around the cable 20. As the cable 20 enters the tube 10, the cable 20 wound around the drum 20b is sequentially fed into the tube 10 through the introduction port 14 and the introduction pipe 13.

As shown in FIG. 1, the penetrating hydraulic pressure receiving umbrella 23
When reaches the base end portion of the tube 10 on the other end side of the conduit 22, the hydraulic pressure receiving umbrella 23, that is, the cable head 20a is pulled out from the base end of the tube 10. This allows the cable 20
Is laid in the conduit 22. After the cable 20 is laid in the conduit 22, compressed air is supplied into the tube 10 by a compressor (not shown) to discharge only the water in the tube 10. The discharged water is discharged to a sewer pipe (not shown) provided in the manhole 25. After laying the cable 20, the tube 10 is left as it is for laying the next cable. When laying the next cable, the work of inserting the cable in (b) into the tube is repeated. In this case, two or more cables can be laid as long as the hydraulic umbrella can penetrate into the tube. As shown in FIGS. 8 and 9, since the water pressure receiving umbrella 23 is deformed by the cable 20 laid first, the cable 20 laid first does not hinder the laying of the second and subsequent cables 20.

In the above embodiment, a tube slightly longer than the conduit is prepared, and the cable 20 is started to be laid when the proximal end of the tube appears from the other end of the conduit 22, as shown in FIG. The length of the tube 10 to the conduit 22
The tube 1 with the pipe line 22 inserted more than twice
It is also possible that 0 is further fed from the drum 10b, the base end portion thereof is taken out from the manhole 25, and the ground is fitted to connect it to the circulation connection port 12c of the water tank 12a. Thereby, the water flowing in the tube 10 is circulated to the water tank 10a, and the water is effectively used. In this case, if the tube 10 is transparent or translucent, the cable head 20a that enters the tube 10
It is possible to visually confirm the degree of intrusion.

In the above embodiment, the introduction pipe is a tubular body and the introduction port is provided obliquely in the middle thereof. However, the introduction pipe to the tip of the introduction pipe is formed into a straight tubular body and is provided obliquely. High pressure water may be supplied from the body. Further, in the above-mentioned embodiment, the introduction pipe is provided with a female screw at the base end and is connected to the introduction pipe by being screwed into the male screw provided at the supply port. And may be connected by a flexible tube. By connecting with the flexible tube in this way, the high-pressure water supply device and the introduction pipe can be separated, and the high-pressure water supply device is arranged on the ground so that only the introduction pipe faces one end side of the pipeline. Can be arranged as well. Further, in the above-mentioned embodiment, the large diameter portion of the hydraulic pressure receiving umbrella is formed in a size corresponding to the inner diameter of the tube, but if the inside of the tube can be invaded by high pressure water while being attached to the tip of the cable, the inner diameter of the tube You may form in a smaller diameter.

[0021]

As described above, according to the present invention, in the first step, the tube is inserted into the conduit, and in the second step, the cable with the hydraulic head umbrella attached to the cable head is inserted into the tube. The high pressure water supply causes the hydraulic umbrella to move inside the tube and lay the cable in the pipeline.Therefore, in the pipeline where water or obstacles exist in the pipeline or in the pipeline where the cable has already been laid. Cables can be laid smoothly. Also,
Since the pressure receiving umbrella moves inside the tube and lays the cable inside the conduit by supplying high-pressure water, it is necessary to reinsert the tube even when laying multiple cables at one time. It can be omitted.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a cable according to an embodiment of the present invention is laid in a pipeline.

FIG. 2 is a side view of an apparatus for laying a cable in a pipeline according to an embodiment of the present invention.

FIG. 3 is a view showing a state in which an introduction pipe is attached to a supply port and a state in which a tube inserted from the introduction port is attached to a tip of the introduction pipe.

FIG. 4 is a diagram corresponding to FIG. 3 showing a state in which a hydraulic umbrella is attached to a cable head to be laid and the cable enters the tube from the introduction pipe.

FIG. 5 is a view corresponding to FIG. 1, showing a state in which a tube is inserted into a duct using the device of the embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 7 is a sectional view of the pipeline showing a state where the tube enters the pipeline.

FIG. 8 is a cross-sectional view of the tube showing a state in which one cable is laid inside the tube and then the next second cable is laid by a hydraulic pressure receiving umbrella.

FIG. 9 is a sectional view taken along line AA of FIG. 8;

[Explanation of symbols]

 10 Tube 10a Inside Out Part 12 High Pressure Water Supply Device 12a Water Tank 12b Pump 12c Circulation Connection Port 12d Supply Port 13 Introducing Pipe 14 Introducing Port 19 Band (Tube Fixture) 20 Cable 20a Cable Head 22 Pipeline 23 Water Pressure Receiving Umbrella

Claims (7)

[Claims] 1. A flexible tube (10) having the same length as said conduit (22) or longer than said conduit (22) on one end side of said conduit (22).
The tip part of the tube is placed inside out, high-pressure water is supplied between the inside-out part (10a) and the tube (10), and the tube (10) is sequentially turned over by the supply of the above-mentioned high-pressure water to the tube. The tube (10) is inserted into the pipe (22) in order, and the tube (10) is inserted into the pipe (22) by pulling out the proximal end of the invading tube (10) from the other end of the pipe (22). Road
Insert the cable (20) into the cable head (20a) and attach the hydraulic umbrella (23) to the cable head (20a), and connect the cable (20) having the same length as or longer than the conduit (22) to the conduit (22). (22) is inserted into the inserted tube (10) from one end side, high pressure water is supplied into the tube (10) located at one end side of the pipeline (22), and the high pressure water is supplied to the tube (10). The cable (20) is formed by sequentially injecting the water pressure receiving umbrella (23) into the tube (10).
Sequentially intruding into the tube (10), the intruding hydraulic pressure umbrella (23) is pulled out from the tube (10) located on the other end side of the pipe line (22) to connect the cable (20) to the tube. Insert the compressed air into the tube (10) and insert it into the tube (10).
(10) A method of laying a cable in a pipeline, which discharges only the water inside. 2. The tube (10) inserted into the pipe (22) is connected at its proximal end to a tube (10) located at one end of the pipe (22), A method of circulating water
The method of laying the cable in the pipeline described. 3. The method for laying a cable in a pipeline according to claim 1, wherein the tube (10) is transparent or translucent. 4. A high-pressure water supply device (12) having a supply port (12d) for supplying high-pressure water, and a proximal end connected to the supply port (12d) and a distal end being one end side of a pipe line (22). A flexible tube (10) that is installed in the middle of the tube and has the same length as the conduit (22) or longer than the conduit (22).
Alternatively, an introduction pipe (13) having an introduction port (14) for the cable (20) and a state in which the tip of the tube (10) introduced from the introduction port (14) is turned inside out at the tip of the introduction pipe (13). An apparatus for laying a cable in a pipeline, which is provided with a tube fixing tool (18) that is fixed by. 5. The conduit cable laying device according to claim 4, wherein the high-pressure water supply device (12) comprises a water tank (12a) and a pump (12b) for pumping water stored in the water tank (12a). . 6. A tube in which a water tank (12a) is inserted in a pipeline.
The conduit cable laying device according to claim 5, further comprising a circulation connection port (12c) for connecting the base end of (10). 7. The conduit cable laying device according to claim 4, wherein the tube (10) is transparent or translucent.