JPS6120753B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for removing the tube located opposite the communicating hole when a communicating hole with a branch pipe is blocked by a tube attached to the inner circumferential surface of the main pipe. This invention relates to a method for communicating between a main pipe and a branch pipe by automatically drilling holes in the main pipe and branch pipes.

[Conventional technology]

Piping systems for gas, water, etc. are equipped with a large-diameter main pipe connected to the supply source and a large number of small-diameter branch pipes that communicate with this main pipe through communication holes opened in the peripheral wall of this main pipe. Almost all of these are buried underground. If a leak occurs in the main pipe for some reason, recently, hard shafts are dug (or existing manholes, etc. are used) at appropriate locations spaced from the leak on both sides of the main pipe in the longitudinal direction. A method of preventing leakage has been carried out by cutting the main pipe, introducing a flexible tube inside, and joining this flexible tube to the inner surface of the peripheral wall of the main pipe by heat-sealing or gluing. There is.

[Problem that the invention seeks to solve]

However, with this construction method, the communication hole that connects the main pipe and the branch pipe would be blocked, so conventionally, the joint with the branch pipe was exposed by excavating from the ground, and the branch pipe was first cut. After drilling into the tube from the outside, the branch pipe was reconnected to the main pipe. Therefore, it required a lot of work and caused inconveniences such as blocking ground transportation due to excavation.

Therefore, it is an object of the present invention to eliminate the need for excavation from the ground, cutting and reconnecting branch pipes, etc., thereby reducing the number of man-hours required and allowing tube drilling work to be carried out without interfering with ground traffic. The purpose of the present invention is to provide a method of communication construction between a main pipe and a branch pipe.

[Means for solving problems]

In the present invention, a movable body is moved in the tube axis direction within a main pipe to which a tube is attached on the inner surface, and a movable element energized by an excitation coil is provided on the outer peripheral surface of this movable body, and this movable body is attached to the tube. so that it is displaced when facing the communication hole between the main pipe and the branch pipe through the pipe, and actuates the switch based on this displacement,
The switch operates a cylinder, which drives a perforator that opens the tube.

[Effect]

Therefore, according to this method, in the process of moving the movable body in the tube axis direction, when the mover faces the communication hole through the tube, the mover is displaced by the magnetic force of the excitation coil and operates the switch. Since the punching body is automatically operated by this, the tube of the continuous hole can be opened automatically.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings. In FIG. 1, a branch pipe 2 is connected to a main pipe 1 buried underground. In order to close a leakage point 3 occurring in the main pipe 1, shafts 4 and 5 are excavated from the leakage point 3 along the main pipe 1 at appropriate positions spaced apart from each other on both sides in the longitudinal direction. The main pipe 1 is cut at the shafts 4 and 5, and the leakage point 3 is closed by attaching a soft tube 6 introduced therein to the inner circumferential surface by means such as heat fusion or adhesion. Moreover, this also closes the communication hole 7 (see FIG. 3) with the branch pipe 2 at the same time.

A tube 6 located opposite to the communication hole 7
A moving body 8 is introduced into the interior of the main pipe 1 in order to form an opening in the main pipe 1 . The moving body 8 includes a cylindrical main body 9 as illustrated in FIG. The main body 9 includes a plurality of guide wheels 10 located at both front and rear ends, arranged at intervals in the circumferential direction, and in rolling contact with the inner circumferential wall of the tube 6 . One end of a wire rope 12 is connected to the front end of the main body 9 via a universal joint 11, and the other end of this rope 12 is wound around the drum of a winch 13 provided in the shaft 5. A compressed air hose 14 is connected from the rear end of the main body 9.
and electric wires (not shown) are led out and connected to respective supply sources (not shown).

As schematically shown in FIG. 2, a large number of detection grenades 15 are attached to the main body 9, which are arranged at mutually different positions in the circumferential direction. This detection grenade 15 is for detecting the position of the communication hole 7, and when the main pipe 1 is made of a magnetic material such as steel, it is constructed as shown in FIG. 3, for example. ing. That is, in the figure, the main body 9
A cylinder 17 extending in the radial direction is supported via a support member 16. A movable element 18 made of a magnetic material such as soft iron is slidably fitted into the cylinder 17 at its outer circumference. The movable element 18 penetrates a through hole 19 formed in the peripheral wall of the main body 9 and protrudes outward, and has a tip 20 formed in a smooth spherical shape, and is disposed inside the main body 9. It is urged inward (downward in the figure) by a coil spring 22 interposed between the flange 21 and the inner wall of the main body 9. An excitation coil 23 is provided in the main body 9 so as to be located on the outer periphery of the movable element 18 . When the excitation coil 23 is in the energized state, the movable element 18 is configured to overcome the coil spring 22 and move outward if the tip end 20 faces the peripheral wall of the main pipe 1.

In other words, when the mover 18 faces the peripheral wall of the main pipe 1, the magnetic field generated by the excitation coil 23 forms a closed loop magnetic path between the mover 18 and the main pipe 1 made of magnetic material, and a magnetic force is generated. Therefore, the mover 18 is attracted to the main pipe 1 and the coil spring 22
The distal end portion 20 is brought into contact with the inner surface of the main pipe 1 via the tube 6.

When the tip end 20 of the movable element 18 is moved to a position facing the communication hole 7, the main tube 1 made of magnetic material no longer exists, so the closed-loop magnetism that attracts the movable element 18 outwards is removed. Since no magnetic force is generated by the path, the mover 18 is moved by the coil spring 2.
It is configured to be moved inward by the restoring force of 2 and separated from the tube 6, and to close a switch (not shown).

On the other hand, inside the cylinder 17 is a piston 2.
4 is slidably fitted. This piston 2
4 is biased inward by a coil spring 25 interposed between the cylinder 17 and the rod side end. Further, the piston rod 26, which is a perforated body that penetrates through the rod side end and projects outward, has a perforated portion 27 in the shape of a sharp cone formed at its tip. At the head side end of the cylinder 17,
A solenoid valve 28 which is controlled to open and close by the switch and is connected to the compressed air hose 14.
is provided. The piston 24 and the piston rod 26 constitute a drilling mechanism 29 together with the cylinder 17, and when the switch is closed and the solenoid valve 28 is opened, the piston 24 and the piston rod 26 are
4 is moved outward against the coil spring 25, the perforated portion 27 of the piston rod 26 pierces the tube 6, and when the solenoid valve 28 is closed by opening the switch, the coil spring 25 As a result, the piston 24 and the piston rod 26 are moved inward, so that the perforation 27 is located inward from the tip 20 of the movable element 18.

Therefore, when the moving body 8 is moved by the winch 13 via the rope 12 and the universal joint 11, the tip end 20 of the mover 18 touches the peripheral wall of the main pipe 1,
If they are facing each other via tube 6, mover 1
8 is attracted to the main tube 1 by magnetic force, the switch remains open, the tip 20 is in sliding contact with the inner surface of the tube 6, and the perforated portion 27 of the piston rod 26 is in a non-projecting position. When the distal end portion 20 of the movable element 18 moves to a position facing the communication hole 7 via the tube 6, the movable element 18 is not subjected to the magnetic attraction action by the main pipe 1, so that the coil spring 22 As a result, the piston rod 26 moves forward and the perforation 27 pierces the tube 6. When the movable body 8 is moved in this state, the piston rod 26 is also moved, so that the opening formed in the tube 6 is enlarged. Then, when the tip end 20 of the movable element 18 approaches the peripheral wall of the main pipe 1, the movable element 18 returns to the main pipe 1.
Since the piston rod 26 is pulled back by the coil spring 25 and the switch is opened, the piston rod 26 is moved back by the coil spring 25, so that the movement of the moving body 8 is not hindered.

That is, by simply moving the movable body 8 in the tube axis direction, the tube 6 can be automatically bored at a position opposite to the communication hole 7.
Since the branch pipe 2 can be communicated with the branch pipe 2, there is no need to excavate the ground again, cut the branch pipe 2, reconnect it, etc., and the required man-hours can be significantly reduced.

In addition, although the case where the movable element 18 which is electromagnetically attracted to the steel main pipe is used is described above, instead of this, for example, in the case of the main pipe made of a non-magnetic material, the movable element 18 may be energized by an excitation coil. When the movable element has been moved to a position facing the communication hole, it is further moved outward to push the tube outward, and the switch is actuated by this movement. is also possible. Further, the perforation mechanism 29 may also have a different configuration from the illustrated example, and hydraulic pressure may be used instead of compressed air as its driving power source.

〔Effect of the invention〕

As described above, the present invention moves a movable body in the tube axis direction within a hose attached to the inner circumferential surface of the main pipe, and a movable element disposed on the outer circumference of the movable body applies the magnetic force of the excitation coil. When the movable element is displaced and faces the communication hole at the connection between the main pipe and the branch pipe, the switch is actuated, and in response to the signal from the switch, the perforating body is driven by the cylinder and inserted into the tube. Since an opening is formed, there is no need to excavate from the ground or cut and reconnect branch pipes in order to communicate between the main pipe and branch pipes, which greatly reduces the required man-hours and improves ground transportation. This will not cause any inconvenience such as inhibition of

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is an explanatory view showing a schematic configuration of a moving body in the same example, and FIG. 3 is an enlarged sectional view of a main part in the same example. 1... Main, 2... Branch, 6... Tube, 7
...Communication hole, 8...Moving body, 17...Cylinder,
18...Mover, 22, 25...Coil spring, 2
3... Excitation coil, 24... Piston, 26...
Piston rod (bore part), 27...bore part, 2
8... Solenoid valve.

Claims (1)

[Claims] 1. A construction method in which a tube is attached to the inner peripheral surface of the main pipe to which the branch pipe is connected, and an opening is formed in the tube located opposite the communication hole between the main pipe and the branch pipe, and a moving object is piped into the tube. A movable element that is movable in the axial direction and is urged outward by an excitation coil is provided on the outer periphery of the movable body, and this movable element faces the communication hole through the tube. Displaced in the radial direction of the main pipe, this displacement is detected by a switch to operate a cylinder, and the cylinder drives a perforating body that opens a tube located in the communication hole. A method of connecting pipes and branch pipes.