JPS64320Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a method for forming a hole in the lining material at the branched part of the pipe to allow the branch pipe to pass through the pipe. It is related to a tool, and in particular, it is inserted from the side of a bent small-diameter branch pipe to the branch part,
The present invention relates to a punching tool for punching holes in lining materials.

BACKGROUND ART In general, pipes such as gas pipes and water pipes that are mainly buried underground are lined with a lining material for the purpose of repairing or reinforcing the pipes.

In this lining method, adhesive is applied to the inner surface of a flexible cylindrical lining material, one end of the lining material is fixedly supported in an annular shape, and fluid pressure is applied to the rear part of the annular fixed part. At the folded part formed there, while turning the lining material over so that the inside becomes the outside, the folded part is advanced into the pipe, and at the same time, the turned over lining material is inserted into the pipe, and at the same time, the fluid is A known method is to apply pressure to the inner surface of the pipe via the adhesive, solidify the adhesive, and bond. This method has many advantages, such as not having to dig up the entire length of the pipe, but only at both ends of a predetermined section, and allowing long pipes to be constructed in a short period of time. This method is attracting attention.

However, when the pipe is lined with this method, the lining material covers the entire inner surface of the pipe, so if the pipe has a branch pipe, the branch pipe will be blocked. For example, in the case of gas pipelines, the main high-pressure and medium-pressure pipes have almost no branches, so the problems mentioned above do not occur, but in the low-pressure pipes at the end, there are many supply pipes to supply gas to each home. It's branching out. Therefore, it is inconvenient to line the low-pressure pipe with a lining to block the supply pipe in the above-described manner, as this would cut off the gas supply to each household.

Gas supply can be secured by digging up and perforating the branch part after lining the pipe, but if the branch part was dug up for each supply pipe, it would be no different than digging the entire length of the pipe, and the gas supply would be ensured. The greatest advantage of adopting the lining method is lost.

Therefore, after lining the pipeline, it is necessary to drill holes in the lining at the branching portion of the pipeline and pass the branching pipe through the pipeline without digging up the branching portion.

Prior Art As a publicly known method for the above purpose,
A method described in Japanese Patent No. 41274 is known.
In this method, after the lining material is attached to the inner surface of the pipe, a heating tool is inserted from the branch pipe while removing back pressure, and hot air is blown from the heating tool onto the lining material to melt the lining material and make a hole. be.

Another known method is the method described in Japanese Patent Laid-Open No. 58-49211. This method is
Prior to installing the lining material, the branched portion of the pipe is closed off with a plug, and after the lining material is installed, the plug is made to generate heat to melt the lining material and perforate the pipe.

In both of the above two prior art techniques, the heating tool or plug is moved using fluid pressure to be positioned at the branched part, but it is difficult to insert the heating tool or plug into the thin and intricately curved branch pipe using fluid pressure. was extremely difficult.

Furthermore, in the method of JP-A No. 55-41274, the holes cannot be easily drilled because the holes are drilled using hot air, and furthermore, when bonding the lining material to the inner surface of the pipe, some of the adhesive flows into the branch pipe, causing problems. It is extremely difficult to perform melt perforation.

Furthermore, in the method disclosed in Japanese Patent Application Laid-open No. 55-49211, it is necessary to attach the stopper to the branch part in advance before attaching the lining material, and it is not easy to attach the stopper correctly. It has the disadvantage that it cannot be applied to pipes that have been lined.

In view of these circumstances, the applicant has proposed to attach a compressible second coil spring that is sufficiently more flexible to the tip of the first flexible coil spring, either directly or between the first coil spring and the second coil spring. The second coil spring is connected via a third coil spring having an elasticity intermediate to that of the second coil spring, and an electric heater is provided at the tip of the second coil spring, and the first coil spring is rotated while being inserted into the conduit. A drilling tool is devised in which the electric heater is fed in and moves along the pipe line while swinging the electric heater by the elasticity of the second coil spring, and the electric heater is positioned at the branch part and energized to burn out the lining material and make a hole. , which was previously filed as Utility Application No. 100548/1983. This invention can be applied to pipelines that have already been lined, and can be easily inserted into branched pipes through small diameter and bent branch pipes. It is also possible to easily drill holes in branch pipes that flow into the pipe.

In this drilling tool, a commercially available drain cleaner is used to feed the first coil spring into the pipe while rotating it. In this drain cleaner, the first coil spring is wound and housed in a rotating container, and by rotating the rotating container at a constant speed, the first coil spring is rotated and axially moved at a constant speed. It is sent to

Problems to be solved by the invention However, the invention of Utility Application No. 59-100548 is to feed the first coiled spring while rotating it, and use the elasticity of the second coiled spring to swing the electric heater at its tip as it is inserted. Therefore, in the conduit
If there is a part with a step such as an LM joint, the electric heater may get caught on the step. This condition cannot be detected from outside the pipe, so if the first coil spring 1 is further rotated and fed, the weaker second coil spring may buckle and be damaged, or the electric heater may be damaged. The energized wire may become disconnected. This can occur not only when the electric heater gets caught on a step in the middle of the pipe, but also when the electric heater reaches a branch.

The present invention was developed in view of the above circumstances, and is designed to immediately stop the rotation of the rotating container when the electric heater stops moving forward, thereby preventing buckling of the second coil spring or disconnection of the current-carrying wire. The purpose is to prevent

Means for Solving the Problems Accordingly, the present invention connects a compressible second coil spring that is sufficiently more flexible than the first flexible coil spring to the tip of the first flexible coil spring. An electric heater is provided at the tip of the second coil spring, and the energized wire of the electric heater is guided backward through the first and second coil springs and connected to a power source and a switch. A punching tool in which a rear part of a spring is wound and housed in a rotating container, and the first coil spring is sent into the pipe while rotating by rotating the rotating container, and a detection body is provided on the outer periphery of the rotating container. At the same time, a non-contact output switch that emits a pulse when the detection object approaches is provided near the rotation path of the detection object, and the pulse from the wireless point output switch is detected and the interval between the pulses is set to a predetermined interval. The present invention is characterized in that an electric circuit is formed to stop the rotation of the rotating container when the rotation time is longer than the specified time.

The present invention will be explained below with reference to the drawings. FIG. 1 shows an embodiment of the punching tool of the present invention. In FIG. 1, reference numeral 1 denotes a first flexible coil spring, which is a relatively rigid contact spring. Note that this first coil spring 1
Since the tube is operated from the rear and rotates while moving through a small diameter pipe, it is not preferable to use an excessively flexible tube.

As shown in FIG. 2, a second coil spring 2 is connected to the tip of the first coil spring 1 via a third coil spring. This second coil spring 2
is a compression spring that has approximately the same diameter as an electric heater 4 to be described later, and is sufficiently softer than the first coil spring 1. Further, the third coil spring 3
has a flexibility intermediate between that of the first coil spring 1 and the second coil spring 2. Although this is not necessarily necessary, if there is a large difference in flexibility between the first coil spring 1 and the second coil spring 2, they may not move smoothly through the pipe when they are directly connected. Therefore, it is preferable to interpose a third coil spring 3 having intermediate flexibility.

An electric heater 4 is attached to the tip of the second coil spring 2. The electric heater 4 has an outer diameter slightly smaller than the minimum inner diameter of the pipe through which it is inserted, and has a spirally wound nichrome hot plate 5 exposed at its tip. Ori,
A voltage of 12V and a power of about 60W is suitable. Since the hot plate 5 is exposed at the tip end surface of the electric heater 4 and is easily damaged, it is preferable to protect the tip end surface by covering it with thermoplastic plastic. This plastic is melted by the heat of the electric heater 4 when perforating the lining material.

The outer end of the hot plate 5 of the electric heater 4 is electrically connected to the first coil spring 1 via the second coil spring 2 and the third coil spring 3, and the inner end of the hot plate 5 A current-carrying wire 7 is connected to the end via a screw 6, and the current-carrying wire 7 is connected to the second coil spring 2,
It is inserted into the third coil spring 3 and the first coil spring 1 and extends rearward.

A rotary container 8 is provided behind the first coil spring 1, and the first coil spring 1 is wound and housed within the rotary container 8. The rotating container 8 has a first coil spring 1 whose front end is on the rotating shaft.
A pull-out opening 9 is formed for pulling out the spring 1, and a chuck mechanism 10 for gripping the first coil spring 1 is provided in front of the pull-out opening 9. As the rotary container 8 rotates, the first coil spring 1 is sent forward by the chuck mechanism 10.

An electric wire 11 connected to the current-carrying wire 7 is drawn out from an opening formed at the rear end of the rotating container 8, and the electric wire 1
A power source 12 and a switch 13 are connected between the rotary container 8 and the first coil spring 1, and the switch 13 is closed so that the hot plate 5 can be energized.

There is a rotating shaft 15 that is rotated by a motor 14 in parallel to the rotation axis of the rotating container 8. A pulley 16 is provided on the rotating shaft 15, and a belt 17 is stretched between the pulley 16 and the rotating container 8. The rotary container 8 is driven to rotate by a motor 14. 18 is an electromagnetic brake.

A reflective tape 19 as a detection object is attached to a part of the outer periphery of the rotating container 8, and the reflective tape 19
A photoelectric switch 20 as a non-contact output switch is provided adjacent to the rotation path of the switch. The photoelectric switch 20 is connected to a motion detector 21, reads the signal from the photoelectric switch 20 as a pulse, and measures the interval. When this interval becomes a predetermined length or more, a normally closed switch 22 of a circuit that energizes the motor 14 is opened, and a normally open switch 23 of a circuit that energizes the electromagnetic brake 18 is closed.

Note that the combination of the detection object and the non-contact output switch is not limited to the above-mentioned combination of the reflective tape 19 and the photoelectric switch 20, but other combinations such as a metal object and a proximity switch may be used. You can also do it.

Function To insert this piercing tool into a branch pipe, first insert the electric heater 4 and the second coil spring 2 from the end of the branch pipe, drive the motor 14 to rotate the rotating container 8, and then insert the electric heater 4 and the second coil spring 2 from the end of the branch pipe. The coil spring 1 is rotated and sent out from the drawer port 9, and the electric heater 4 and the second coil spring 2 are sent into the branch pipe.

When the first coil spring 1 rotates, the second coil spring 2 rotates via the third coil spring 3, and the second coil spring 2 is more fully rotated than the first coil spring 1. Since it is flexible, the second coil spring 2 is swung as if shaking its head. Therefore, at the bend in the pipe, the electric heater 4 moves while searching for the direction of the bend, and moves smoothly along the bend.

By the way, when the electric heater 4 gets caught on a step in the pipe, or when the electric heater 4 reaches a branch and is pressed against the lining material, the rotation of the electric heater 4 is extremely reduced. , progress is halted. Nevertheless, the rotation of the first coil spring 1 continues, and thereby the second coil spring 2 is strongly twisted. Therefore, the rotation of the first coil spring 1 is decelerated due to the resistance of the second coil spring 2, and accordingly, a load is applied to the rotating container 8, and its rotation is also decelerated.

As a result, the frequency with which the photoelectric switch 20 detects the reflective tape 19 decreases, and the motion detector 2
The interval between pulses at 1 becomes larger. When the interval becomes larger than a predetermined length, the motion detector 21 issues a signal, opens the normally closed switch 22 of the motor circuit to stop the power supply to the motor 14, and also opens the normally open switch 2 of the electromagnetic brake circuit.
3 is closed and the electromagnetic brake 18 is activated to stop the rotation of the rotating shaft 14.

As a result, the rotation of the rotary container 8 is immediately stopped, and the rotation and feeding of the first coil spring 1 is also stopped, preventing the second coil spring 2 from being twisted any further.

If the electric heater 4 gets caught on a step or the like in the pipe and stops, the rotating container 8 is slightly reversed, the electric heater 4 is pulled back via the first coil spring 1, and then the operation is resumed. If the electric heater 4 has stopped because it has reached the branching part, the switch 13 is closed and the hot plate 5 is energized to generate heat, thereby heating the electric heater 4 and perforating the lining material.

The outer diameter of the second coil spring 2 is preferably slightly smaller than the minimum inner diameter of the conduit and approximately the same diameter as the outer diameter of the electric heater 4 to stabilize the position of the electric heater 4 in the conduit. , it is possible to prevent the second coil spring 2 from buckling when passing through the bend. Further, the length of the second coil spring 2 is suitably slightly longer than the length of the bent portion of the tube. If it is too short, it will be difficult for the electric heater 4 to pass through the bent portion of the tube, and if it is too long, the second coil spring 2 will easily buckle, which is not preferable.

Effects of the invention As described above, the present invention has the second coil spring 2.
Since it advances while shaking its head, it can advance smoothly even in branch pipes with many bends, and even when the pipe is bent upward, it can proceed in the direction of the bend. Furthermore, since no fluid pressure is used, no back pressure is applied, and insertion is extremely easy. Furthermore, even if there are steps or obstacles such as LM joints in the branch pipe, it will be inserted smoothly while avoiding them, and will not dig into the LM joints.

Furthermore, even if the advance of the electric heater 4 is obstructed by a step such as an LM joint, the advance will immediately and automatically stop, and the first coil spring 1 will stop moving.
There is no possibility of buckling the second coil spring 2 or breaking the current-carrying wire 7 by forcibly rotating the spring. Furthermore, even when the electric heater 4 reaches a branched portion of the pipe, the device similarly stops, so that the lining material can be perforated in the correct state at all times.

In the present invention, the second coil spring 2 may be directly connected to the first coil spring 1, but by interposing the third coil spring 3 as shown in the above embodiment, Passing through bends becomes smoother. If the first coil spring and the second coil spring, which have very different flexibilities, are directly connected, even if the second coil spring bends at a bend in the tube, the first coil spring will follow the bend. However, by interposing a third coil spring with intermediate flexibility, the second coil spring 2 may buckle along the bend. This allows for smooth guidance.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the drilling tool of the present invention. FIG. 2 is an enlarged central vertical sectional view of the tip of the punching tool of the present invention. DESCRIPTION OF SYMBOLS 1...First coil spring, 2...Second coil spring, 4...Electric heater, 7...Electric wire, 8...
...rotating container, 12...power supply, 13...switch,
19... Reflective tape (detection object), 20... Photoelectric switch (non-contact output type switch).

Claims (1)

[Scope of utility model registration request] A compressible second coil spring that is sufficiently flexible than the first coil spring is connected to the tip of the first flexible coil spring, and an electric heater is provided at the tip of the second coil spring. , the energizing wire of the electric heater is guided rearward through the first and second coil springs and connected to a power source and a switch, the rear part of the first coil spring is wound and housed in a rotating container, and the rotating In a punching tool that rotates the container and sends the first coil spring into the pipeline while rotating, a detection body is provided on a part of the outer periphery of the rotating container, and a detection body is provided near the rotation path of the detection body. A non-contact output type switch is provided that emits a pulse when the detection object approaches, and the pulse from the non-contact output type switch is detected, and when the interval between the pulses is longer than a predetermined time, the rotating container is rotated. A piercing tool for a lining material at a branch of a conduit, characterized in that it forms an electrical circuit that stops.