JP3320913B2 - In-pipe wiring method for cable laying pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conduit construction method,
More particularly, the present invention relates to an in-pipe communication method when a communication cable or the like is laid in a pipe.

[0002]

2. Description of the Related Art In recent years, a cable such as a telephone line, which has been conventionally laid on the ground, has been transferred to a pipe buried underground for reasons such as improving the beauty of a city. As a method, a wire is preliminarily laid from one end to the other end of a pipe buried underground, and a cable is laid in the pipe by connecting and pulling a cable to the wire. I have.

Conventionally, various construction methods have been proposed as the above-described wiring method. For example, as shown in FIG. 4, a traction tool c in which a wire b is connected to a parachute member a is loaded into the pipe d from one end opening of the pipe d, and a blower e is connected to the opening to connect the traction tool. By feeding c to the other end opening side, the wire b is passed through the conduit d. Further, push rods of a predetermined length from one end opening of the not shown pipe, is inserted into conduit while sequentially coupling the rod, pull disconnect rather by connecting the wire to the tip of the rod after insertion completion There is a construction method of passing through the line.

[0004]

By the way, while the demand for laying cables in underground pipelines is increasing, it is necessary to dig the ground to lay one cable and bury a new pipeline. Construction costs are too high. Therefore, it is conceivable to lay multiple cables in a pipeline in which a new cable is laid in a pipeline in which a cable is already laid. However, existing pipelines buried in the ground may be cut around to avoid other buried objects at the time of burial, and as a result, as shown in FIG. recess d1 is formed, water is or collected in the concave portion d1. Further, the cable f are laid conduit, not laid necessarily regularly, may have been laid in meandering tube passage. In the existing cable laying pipeline as described above, when the above-described conventional wiring method is performed in order to perform multiple cable laying work, the following problems arise. (1). When a line is constructed using a parachute traction tool, the traction tool is blocked by water staying in a recess in the pipeline or a meandering cable in the pipeline, and cannot be moved in the pipeline. (2). When conducting wire construction work using a rod, the cable laid in the pipeline at the tip of the rod is damaged.

The present invention has been made to solve these problems, and an object of the present invention is to provide a proper wiring method in an existing pipeline in which a cable is laid.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a pipe line in which a cable is laid in a pipe line provided between manholes. In the in-pipe wiring method in which a wire rod is connected from the opening side to the second opening side and the wire rod is inserted into the pipe by inserting the wire rod in the pipe, the above-described pulling tool has a high air content and is freely deformable. Return
Formed of soft sponge with original properties, cavity spherical is provided in the central portion to have a outside diameter of the inner diameter of the same order of the conduit
A ball member, which is formed so that the ball member covering over the required clearance, including the ball member in the rear
A water-resistant bag-shaped sheet member having a small-diameter air hole capable of discharging the air having the air hole.
The traction tool, which is a wire connected to a string converging point attached to a plurality of locations around the periphery , is loaded into the pipeline from the first opening of the pipeline, and a suction device is connected to the second opening side of the pipeline. When the suction device is driven to move the traction tool in the pipeline in which the cable is laid, the differential pressure generated in the pipeline while the traction tool is deformed according to the gap between the inner wall of the pipeline and the cable. In this case, the wire is moved from the first opening to the second opening to pass through the wire.

[0007]

[0008]

First, an in-line traction tool connected to a wire from the first opening of the line is loaded into the line in which the cable is laid . At this time, the in-pipe communication line traction tool is provided with a high air content change.
Formed with a flexible sponge that is flexible and resilient, and has a spherical cavity at the center where its outer diameter is about the same as the inner diameter of the pipeline
The ball member and a rear portion formed so as to cover the ball member with a required clearance are included in the ball member.
Because it is composed of a highly water-resistant bag-shaped sheet member having small-diameter air holes capable of discharging the air,
About the same as the inner diameter of the conduit formed by the sponge in the traction tool
The ball member having an outer diameter of about 10 degrees is freely deformed in accordance with the gap between the inner wall of the conduit and the cable due to the combined freedom of clearance between the bag-shaped sheet member and the spherical cavity provided at the center. Ball whose outer diameter is about the same as the inner diameter of the pipeline
The traction device with resilience by members is the inner wall of the pipeline and the cable
It is loaded in close contact with Le. Next, the second opening of the pipeline is closed, and a suction device is connected and driven. Then, a differential pressure is generated in the pipeline with the traction device interposed therebetween, and the differential pressure causes the traction device to move from the first opening side to the second opening side of the pipeline. At that time, the traction tool is provided at the center of the ball member with the clearance between the ball member and the bag-shaped sheet member.
Due to the combined degree of freedom of the ball member with the provided spherical cavity , the ball member is freely deformed according to the gap between the inner wall of the conduit and the cable, and moves while sealing between the inner wall of the conduit and the cable . For this reason, even when water stays in the pipeline, it moves while pushing the water. As a result, in the existing pipeline in which the cable is laid, both the wiring and the drainage are performed in one step.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining the outline of the present invention. Reference numeral 1 denotes an existing pipeline provided between a manhole 2 and a manhole 3. The pipe 1 is a steel pipe having an inner diameter of about 80 mm, and has a recess 11 in a part of the pipe 1 due to turning around to avoid other buried objects. And the recess 1
In 1, water such as rainwater that has entered from manholes 2 and 3 is retained. A communication cable 4 such as a telephone line is laid in the pipeline 1 while meandering. The communication cable 4
Is a copper wire such as a metal cable covered with a jacket, and its outer diameter is about 34 mm.

[0010] the above-described conduit 1, a manhole 2 side
From the starting end opening 12 which is one opening , the wire 6
Is loaded. The wire 6 is made of a material having a high rigidity and a relatively light weight, and is connected to the rear stage of the in-pipe through-line traction tool 5. Further, the suction device 7 is connected by sealing the terminal opening 13 which is the second opening on the manhole 3 side. Then, the suction device 7 is driven to move the in-pipe communication line traction tool 5 from the start end opening 12 side of the pipe line 1 to the end opening part.
Move to 13 side .

As shown in FIG. 2, the in-pipe communication line traction tool 5 is formed so as to cover a ball member 51 having an inner diameter of 80 mm having an outer diameter substantially equal to the inner diameter of the conduit 1, and to cover the ball member 51. And a sheet member 52. The ball member 51 is formed of a soft sponge having a low density and a high air content, and has a spherical hollow portion 51a at the center thereof, and the hollow portion 51a is ３ of the outer diameter of the ball member 51. Of about 25 mm. Therefore, the ball member 51 is easily deformed into any shape, and is configured to have high resilience. The seat member 52 is formed of a material having excellent water resistance, such as nylon, and has a spherical bag shape so as to cover the ball member 51.
When the ball member 51 is deformed, the ball member 51
The sheet member 52 is provided with a small-diameter air hole 52a communicating with the atmosphere so that the air contained in the sheet member 52 can be discharged. Here, as shown in the drawing, there is a required clearance between the ball member 51 and the seat member 52. Strings 52b of a required length are provided at a plurality of locations around the air holes 52a.
The string 52b is focused at a later stage, and the wire 6 is connected to the focusing point 52c.

The in-pipe communication line traction device 5 configured as described above.
Will be deformed in accordance with the shape of the gap between the inner wall of the pipe 1 and the communication cable 4 when loaded into the pipe 1, and the outer peripheral surface of the traction tool 5 will communicate with the inner wall of the pipe 1. It comes into close contact with the outer periphery of the cable 4.

Further, as shown in FIG. 2B, when the ball member 51 is divided into two parts, the divided ball members 51 in the sheet member 52 are shifted or separated from each other, so that the pipe line is further increased. 1 is easily deformed in accordance with the shape of the gap between the inner wall 1 and the communication cable 4. However, the ball member 51 is not limited to being divided into two, but may be divided into three, four, or more. In such a case, the ball member 51 is easily deformed according to the gap shape as described above.

Next, the operation of the present invention will be described. In FIG. 1, first, an in-pipe through-line traction tool 5 to which a wire 6 is connected through a starting end opening 12 of the pipe 1 is loaded into the pipe 1. Next, the terminal opening of the pipeline 1 is sealed, and the suction device 7 is connected and driven.
Then, a differential pressure is generated in the pipeline 1 with the traction device 5 interposed therebetween, and the traction device 5 is moved from the start opening 12 side to the end opening 13 side of the pipeline 1 by the pressure difference.

At this time, the traction tool 5 moves while deforming according to the gap between the inner wall of the pipeline 1 and the communication cable 4. For example, when the cable 4 is located below the pipeline 1. As shown in FIG. 3A {a sectional view taken along the line AA in FIG. 1}, the traction tool 5 is deformed so as to hold the cable 4,
The outer peripheral surface of the traction tool 5 comes into close contact with the inner wall of the conduit 1 and the outer periphery of the communication cable 4. In addition, when the cable 4 is located substantially at the center in the pipeline 1, FIG.
As shown in -B sectional view｝, the traction tool 5 is deformed so as to embrace the cable 4, and the outer peripheral surface of the traction tool 5 comes into close contact with the inner wall of the conduit 1 and the outer circumference of the communication cable 4, as described above.

As described above, the in-pipe communication line traction tool 5 moves so as to seal between the pipe and the inner wall. for that reason,
Even when water stays in the concave portion 11 of the pipeline 1, the water moves so as to push out the water. At this time, since the traction tool 5 has a central portion as a sealing surface, water does not enter through the air holes 52a formed behind the traction tool 5. Furthermore, even if the traction tool 5 cannot be deformed to fit exactly into the gap between the inner wall of the pipe 1 and the communication cable 4 and even if a slight gap is generated temporarily, the suction device sucks the pipe. The line traction tool 5 does not stop in the pipeline 1, and furthermore, water does not flow out of the clearance and the water cannot be discharged. In this way, in the existing pipeline 1 in which the cable 4 is laid, both the wiring and the drainage are performed in one step.

[0017]

As described above, according to the present invention, the in-pipe through-line traction tool has a high air content and is deformable and resilient.
A ball member formed of a soft sponge having an outer diameter substantially equal to the inner diameter of the conduit and having a spherical hollow portion at the center thereof, and a rear portion formed so as to cover the ball member through a required clearance Air contained in the ball member
Is formed of a water-resistant bag-shaped sheet member having a small-diameter air hole capable of discharging air, so that the traction tool has a clearance between the ball member and the bag-shaped sheet member, and a center portion of the ball member. Due to the combined degree of freedom of the ball member provided by the provided spherical hollow portion , the ball member moves in close contact with the inner wall of the conduit and the cable and freely deforms according to the gap between the inner wall of the conduit and the cable . As a result, proper wiring work can be performed without damaging the existing cable even in the existing pipeline where the cable is laid, and even the work of discharging the water remaining in the pipeline in one process. Will be able to do it. As a result, it is possible to carry out the multi-layer laying work and the drainage work in the cable conduit at a low operation cost.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of the present invention.

FIG. 2 is an explanatory view of an in-pipe traffic line traction tool.

FIG. 3 is an explanatory view of the operation of the in-pipe communication line traction tool

FIG. 4 is an explanatory view of a conventional technique.

FIG. 5 is an explanatory view of an existing pipeline.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline 11 Concave part 12 Start end opening 13 End opening 2 Manhole 3 Manhole 4 Communication cable 5 In-tube traction tool 51 Ball member 51a Hollow part 52 Sheet member 52a Air hole 52b String 52c Focusing point 6 Wire rod 7 Suction device

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 1/08

Claims (1)

(57) [Claims] 1. A pipe passage in which a wire is connected from a first opening side to a second opening side of a pipe in a pipe in which a cable is laid in a pipe provided between manholes. In the in-pipe wiring construction method in which a wire traction tool is inserted and a wire is passed through the pipe, the traction tool has a high air content and is freely deformable and has resilience.
To form a soft sponge, a ball member having a cavity portion of the spherical is provided at the center and have a outer diameter of the inner diameter of the same order of the conduit, so that the ball member covering over the required clearance Air formed in the ball member at the rear formed
And a water-resistant bag-like sheet member having a small-diameter air hole capable of discharging air, and a string bundle attached to a plurality of locations around the air hole.
The above-described traction tool having a wire connected to a point is loaded into the pipeline from the first opening of the pipeline, a suction device is connected to the second opening of the pipeline, and the traction device is driven by driving the suction device. When moving in a pipeline in which the cable is laid, the traction tool is deformed according to the gap between the pipeline inner wall and the cable, and the first opening to the second opening due to a differential pressure generated in the pipeline. In-pipe wiring method for cable laying pipes, characterized by moving to and passing through to