JPH0510008B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for passing a conduit, and in particular, a method for passing a conduit that enables long-distance transportation of a pipe material such as a rope with a simple configuration. Regarding.

[Conventional technology]

Conventionally, underground conduits through which transmission cables such as signal lines are passed are subjected to a penetration test after the conduit is laid and before the cable is inserted, and after inspecting the conduit for any obstructions to passage such as dents, After cleaning, wiring work is carried out for cable insertion in the subsequent process. In these processes, a mandrel having a diameter equivalent to that of the cable is passed through the conduit to inspect for passage obstructions, a waste cloth is passed through the conduit for cleaning, and a rope or the like is passed through the conduit for wiring work. A mandrel like this,
Conventionally, a lacorder, commonly called a mouse, has been used to pass rags, ropes, etc. through a conduit with a diameter of about 25 to 100 mm. This Lacorder generally has a double stacked structure of conical plates with a diameter corresponding to the inner diameter of the pipe, and is connected to a pipe body such as a rope or mandrel and installed inside the pipe. It is used to compress the air from the end of the pipe with compressed air from a compressor and run it through the pipe to pull the pipe material to the other end of the pipe.

[Problem that the invention seeks to solve]

However, when the above-mentioned racoder is run using pressurized air, the lacorder may fly out with force on the reaching side, or the stopper provided to prevent it from jumping out may pop out. There is a danger that workers may be hit by accidents if they are caught in the act, and there have even been cases of fatal accidents. There was also a risk of cable damage even when no workers were present. For this reason, a method using suction has been proposed in place of the pneumatic method for running the lacorder, and some methods have been proposed to avoid the above-mentioned dangers.

However, although the above-mentioned improvement method can prevent accidents in which the racoder or stopper pops out, it requires a large suction device with sufficiently high suction pressure, unlike the pneumatic method, in order to run the lacorder by suction. There were problems with ensuring airtightness and requiring other airtight equipment. In addition, it took time to prepare for these installations, and it could not be said that the workability was good.

The present invention has focused on the above-mentioned conventional problems, and aims to provide a pipe passage method that allows pipe passage work to be carried out quickly using simple tools and equipment.

[Means for solving problems]

In order to achieve the above object, the method for passing a pipe according to the present invention includes a pipe passing method in which a pipe passing material such as a rope is passed from one end of the pipe to the other end. The flexible bags are connected and installed in the conduit, and the flexible bag is suctioned from the other end of the conduit, and the tube passing material is pulled and penetrated, and the suction end side of the conduit is pulled. A transparent joint tube was connected to the transparent joint tube, and a joint cap with a drawn cross section was attached to the end of the transparent joint tube, and when the tube passage was completed, the flexible bag was accommodated in the transparent joint tube so that it could be seen. It is something.

[Effect]

According to the above configuration, the flexible bag is tied to a rope or the like that is a pipe passage material, and the flexible bag is inserted from the entrance of the pipe. Then, the air inside the pipe is sucked from the other end of the pipe by a suction device such as a vacuum cleaner. As a result, the flexible bag moves in the suction direction while maintaining a sealed state to block the inside of the tube due to its nature and suction action, thereby pulling and moving the connected tube passage member. At this time, since the flexible bag can be freely deformed, the conduit can be reliably sealed and the bag can be moved smoothly. In addition, even if the suction force is small, the bag has an excellent sealing force, so it exerts a large traction force and quickly moves the connected pipe material to the end of the pipe. Since the present invention uses a flexible bag, a small, popular vacuum cleaner is sufficient as the suction device, and there is an advantage that large-scale suction equipment is not required.

In particular, it is possible to connect a transparent joint provided with a cap with a narrowed cross section at the end to the suction end side of the conduit, and introduce the flexible bag into the interior thereof. This is because the inertia of the flexible bag is small, and it can be stored and held inside the joint pipe through a cap with a narrow cross section.This allows the bag to be stored inside the joint pipe when the pipe passage is completed. The completion status of the pipe can be seen at a glance.

〔Example〕

Embodiments of the pipe passage method according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a schematic configuration of equipment for implementing the method according to the embodiment. As shown in the figure, this equipment is a conduit 1 connecting manholes 10A and 10B.
This is for passing the rope 14 through 2. For this reason, on the one manhole 10A side, there is a drum 16 on which a clop 14 as a pipe passage material is wound.
is installed on the ground, and the rope 14 let out from this drum 16 is inserted into the conduit 12. Here, a parachute-shaped bag 18 as a flexible bag is attached to the tip of the rope 14 in order to tow and move the rope 14. This bag body 18 is constructed by stacking two vinyl carrier bags, and the hand-held portion is tied to form a parachute shape as a whole. The bag 18 is sized to have an outer diameter that is sufficiently larger than the inner diameter of the conduit 12 when inflated. To attach the bag 18 to the pipe 12, put your hand inside the bag 18, temporarily inflate it, and insert the bag 18 so that it is in close contact with the inner wall surface of the pipe 12. The section is partially inserted into the conduit 12.

On the other hand, a suction device 20 is installed on the manhole 10B side to create a negative pressure in the pipe line 12. This suction device 20 uses a commercially available industrial vacuum cleaner with an output of about 1 kW (manufactured by Sundia Co., Ltd.).
BM-Ml: Air volume 3m ² /min, vacuum degree 2300mmAq:
), especially dry and wet type cleaners. In order to adapt the suction pipe 22 of this suction device 20 to the conduit 12, a joint pipe 24 is used for the conduit 12 in this embodiment. This joint tube 24 is made of a transparent resin material, and as shown in FIG.
A joint cap 26A for connection with the pipe line 12 is attached to one end, and a suction pipe 2 is attached to the other end.
A joint cap 26B is attached for connection with 2. These joint caps 26
A and 26B are rubber caps, and the rubber cap 2 shown in FIG. 4 is used as a tube end cover for a rising branch line following this type of cable conduit.
I try to use one with the tip of 8 cut off. Particularly in this embodiment, the joint cap 26A on the conduit 12 side has a large cut portion, and the bag body 1
8 can pass through the joint cap 26A and enter into the joint tube 24. Further, the joint cap 26B on the side of the suction pipe 22 has a small cutting margin to prevent the bag 18 from being sucked into the suction device 20.

Routing work for the conduit 12 using equipment having such a configuration is performed as follows. Prior to the line,
A bag 18 is connected to the rope 14 and the bag 18 is inserted into the conduit 12. At this time, the bag 18 is put into a swollen shape so that the bag 18 is brought into close contact with the inner wall of the conduit 12. At the other end of the conduit 12, a suction pipe 2 of the suction device 20 is provided.
After connecting the joint pipe 24 to the pipe line 12, the suction device 20 is activated to start suction. Due to the suction action, the bag 18 in the conduit 12 moves toward the joint tube 24 while maintaining its shape along the cross section of the conduit 12, and also moves while being in close contact with the inner wall surface of the conduit 12 due to its flexibility. Due to this suction movement, the rope 14 connected to the bag body 18 is pulled and passed into the pipe line 12. The bag 18 that has moved toward the joint pipe 24 passes through the joint cap 26A and reaches the inside of the joint pipe 24, where it can be visually confirmed by the operator inside the manhole 10A. The bag body 18 tries to move toward the suction pipe 22 side due to the suction action, but the joint cap 26 interposed in between
B has an opening large enough to prevent the bag 18 from passing through, so it will not be sucked into the suction device 20.

In this way, in this embodiment, the bag body 1 is attached to the rope 14.
8 are connected and run by the suction action of the conduit 12, making it possible to carry out wiring work with extremely simple equipment, and the suction power is small, at most a commercially available vacuum cleaner of about 1 kW. You can route the line by using . Therefore,
There is no need for an expensive compressor, and there is no need for airtight maintenance equipment at all, so work efficiency is greatly improved. Furthermore, although the bag body 18 protrudes from the end of the conduit 12, it is flexible and does not have a solid structure, so safety is extremely high.

In the above embodiment, an example in which the present invention is applied to the threading work of the rope 14 has been described, but it goes without saying that this can also be applied to the threading work of wires, mandrels, and rags. Further, the bag 18 may be formed into a parachute shape by tying a string to a piece of cloth, or may be formed into a parachute shape from the beginning.
Furthermore, the bag body 18 may be a sealed bag without an opening, but in this case it should be designed to be able to expand and contract.

〔Effect of the invention〕

As explained above, according to the present invention, the flexible bag is connected to the tube passing material and the tube is pulled through by suction, so that the tube can be passed with a small suction force using simple equipment. Since the parachute-shaped flexible bag is housed inside the transparent joint tube, the completion of pipe threading can be easily confirmed, resulting in highly efficient pipe threading work. Effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of equipment for carrying out the pipe passage method according to the embodiment, Fig. 2 is a perspective view showing the connection state of the rope and the bag, and Fig. 3 is a sectional view showing the structure of the joint pipe. , FIG. 4 is a side view of the rubber cap used for the joint cap. 12...Pipe line, 14...Rope, 18...Bag body, 20...Suction device, 24...Joint tube.

Claims (1)

[Claims] 1. In a pipe passing method in which a pipe material such as a rope is passed from one end of a pipe to the other end, a highly deformable flexible bag is connected to the tip of the pipe material and installed in the pipe,
The flexible bag is suctioned from the other end of the conduit and the tube passing material is pulled through the bag, and a transparent joint tube is connected to the suction end side of the conduit, and a transparent joint tube is connected to the end of the transparent joint tube. A method for passing a conduit, characterized in that a joint cap having a drawn cross section is attached, and the flexible bag is accommodated in a transparent joint pipe to be visible when the pipe is passed.