JPS5934917B2 - How to repair plastic pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing a plastic pipe, and more particularly, the present invention relates to a method for repairing a plastic pipe, and more particularly, the method includes joining a plastic saddle part integrally provided with a pipe part to each of mutually distant parts of a plastic pipe for transporting fluid. A piercing tool is inserted into both the pipe parts from the side of the branch pipe part that communicates with the pipe part, and a through hole is bored with the drilling tool at a location surrounded by the saddle part of the plastic pipe, and The present invention relates to a method of repairing the plastic pipe between the mounting points of both saddle parts by connecting the branch pipe parts with a bypass pipe.

The plastic pipe repair method described above is used when an accident such as cracking or breakage occurs in a plastic pipe used to transport fluids such as gas or water, or when replacing a certain area of pipe. The flow path has the advantage that pipe repair can be carried out without interruption of the flow path.

However, in the conventional repair method, the repair tool consisting of the saddle part, branch pipe part, and drilling tool was left attached to the plastic pipe with only the drilling operation tool removed, which caused the plastic pipe to be buried. If the repair tool is buried during excavation for other construction work in the surrounding area, it is easy to catch the buried repair tool and damage the pipe.Also, when a heavy object passes through the buried repair tool, the weight of the repair tool may cause the pipe to be buried. Stress concentrates on the pipe section, causing new accidents with the plastic pipe itself.Also, even if the pipe is not buried, the presence of repair tools may narrow the space, and the plastic pipe itself may become damaged due to the presence of repair tools. Due to the abutment, accidents were likely to occur, and in both cases, the economical efficiency was poor.

In view of the above-mentioned circumstances, the present invention aims to minimize the number of repair tools left behind on plastic pipes after repair, and to recover a portion of the expensive cutter used as a leakage prevention valve when removing the bypass channel. It can be carried out with no or almost no leakage, and as mentioned above, there is no cause for accidents caused by leaving repair tools behind, and it takes up as little space as possible, which is more economical. The present invention provides a method for repairing plastic pipes that is highly safe in terms of leakage and is overall extremely useful.

That is, in the above-mentioned plastic pipe repair method, the present invention provides a method for removing the bypass pipe from the pipe portion while leaving a portion of the cutter of the punching tool covering the through hole. recovering the remaining portion of the cutter after removal of the portion while preventing leakage through the pipe portion;
A post-processing tool configured to allow insertion of a leak-prevention plug from the pipe section is attached to the pipe section, a portion of the cutter is recovered and the plug is inserted, and then the post-processing tool is inserted from the pipe section. The present invention is characterized in that a cap is removed and then a cap that covers the opening of the pipe portion is fixed to the pipe portion.

In other words, it is possible to leave only the saddle part and the attached pipe part on the plastic pipe and recover the expensive drilling tool and branch pipe part, which is not only economically efficient but also makes the remaining part more compact. Since it is easy to configure, it has become possible to avoid the problems of accidents and space problems caused by leaving bulky repair tools behind, as described above.

Furthermore, some of the cutters used as leakage prevention valves when removing the bypass channel are expensive, so it is necessary to recover them from an economical perspective. We were able to solve the problem by using this method and safely recover a portion of the cutter.

Next, embodiments of the present invention will be described with reference to illustrative figures.

The plastic pipe repair tool 1 used in the method of the present invention includes:
A fitting 4 consisting of a plastic saddle part 2 to be welded to the outer surface of an existing plastic pipe, a pipe part 3 integrated with the saddle part 2, and a fitting 4 that is separably fitted to the pipe part 3. A branch pipe section 6 for taking out the bypass flow path that is connected in communication and tightly fitted with an O-ring 5, and a plastic pipe A at a portion surrounded by the saddle section 2 through the inside of both the pipe sections 3 and 6. The saddle portion 2 includes a drilling tool 8 for drilling through holes 7, 7 in the saddle portion 2.

The punching tool 8 includes a cutter portion 9 and a cutter portion 9.
As shown in FIG.
, 6, and consists of a main body 12, a punching cutter 13, and locking tools 14, 14, which are fitted tightly into the O-IJ songs 1, 11 provided inside the O-IJ songs 1, 6. At 14° 14, locking pieces 15, 15 are provided which protrude in an elastically biased state from the main body 12 in a circumferential direction.

On the other hand, the cutter operation tool 10 has L-shaped engagement grooves 17, 17 formed at the end of the cylindrical rod 16 for receiving the locking tools 14, 14 in the drilling direction, so that the cutter part 9 can be freely separated. It is configured to hold the

A cutter portion 9 is provided inside the upper end of the branch pipe portion 6.
grooves 18, 1 into which the elastically biased locking pieces 15, 15 are fitted when the main body 12 is tightly fitted into the O-ring 11;
8 is formed, and at the end of the groove 18 a cutter portion 9 is formed.
The amount of protrusion of the locking pieces 15, 150 is reduced by 0 rotation,
Camming surfaces 19, 19 are formed which allow a movement of the cutter part 9 in the pipe section 3, 6 in the drilling direction.

Next, one means of forming a bypass flow path using the repair tool 1 and withdrawing the repair tool portion after the repair work is completed will be explained based on FIGS. 5A to 6E and FIGS.

First, as shown in Fig. 5A, the saddle portion 2 and the pipe A are heated and melted at the front and back parts of the plastic pipe A that are far apart from each other with respect to the accident location using a heating heater a, and as shown in the opening of the figure. Then, saddle part 2 and pipe A are welded together.

In this case, it may be bonded with a suitable adhesive.

Next, as shown in Figures C and 2, the branch pipe section 6 fitted with the cutter partial flap 9 is fitted and connected to the pipe section 3 of the saddle section 2, tightened with a band 20 or the like as appropriate, and then operated. By rotating the tool 10, the cutter portion 9 is released from the branch pipe section 6, and the operating tool 10 is released.
At the same time, attach the cutter part 9 to the saddle part 2 and the pipe A through the inside of both pipe parts 3°6.
Through-holes 7, 7 are drilled in the two, and the branch vibros 6 are connected with pipe B to form a bypass flow path for the accident location of pipe A, as well as the pipes before and after the accident location between the repair tools 1, 1. The flow path is closed by thermal welding or using a clamping device, and as shown in FIG.

In this state, that is, with no fluid interruption and no fluid leakage, the pipe A at the accident location is replaced.

When the repair to the accident location is completed, the through hole 7
, 7 by tightly fitting the cutter part 9 into the pipe part 3, and remove the operating tool 10 from the cutter part 9 (see FIG. 6A), and as shown in the opening of FIG.
Remove the branch pipe section 6 from the pipe section 3.

Next, as shown in FIG. 6C, a post-processing tool 21 is attached to the pipe portion 3.

This post-processing tool 27 is attached to a pipe closing body 23 that is tightly connected to the pipe portion 3 by an O-ring 28, and is in close contact with the operating tool rod 16 and prevents movement of the rod 16 in the rod direction. A flexible cylinder 22 having a take-out hole 21 is attached thereto, and a removable pinch clamp 24 pinches the flexible cylinder 22 to close the cylinder flow path. 23 are closely fitted and connected.

Then, as shown in FIG.
1, close the portion of the flexible cylinder body 22 below the part where the cutter portion 9 exists with the pinchers 24,
The cutter part 9 is recovered with leakage through the pipe part 3 being prevented.

Then, as shown in Figure E, the O-ring 5 of the pipe portion 3 is
A leak prevention structure 25 made of, for example, conical plastic that can be tightly press-fitted is attached to the operating tool 10 and inserted into the cylindrical body 22, and then inserted between the two 24 and insert the plug 25 into the pipe section 3 in a tight fit.

That is, the cutter part 9 and the stopper 2 are removed by the post-treatment tool 26 while preventing leakage through the pipe part 3.
5 will be exchanged.

Next, as shown in FIG. Most of the repair tools for the drilling tool itself and the branch pipe section 6, as well as the expensive cutter section 9, are removed, leaving only the saddle section 2 that holds it. Instead of the prevention structure, a structure in which an on-off valve is attached to a hard pipe may be adopted.

[Brief explanation of drawings]

The drawings illustrate embodiments of the method for repairing plastic pipes according to the present invention, FIG. 1 is an exploded perspective view of a repair tool used in the method of the present invention, FIG. 2 is a longitudinal sectional view of the repair tool, and FIG. 3 is a cross-sectional view of the repair tool. 2 is a cross-sectional view taken along the line ■-■, FIG. 4 is a detailed view of the post-processing tool, FIG. FIG. 6 is an explanatory diagram illustrating a procedure for removing a repair tool part over time. 2...Saddle part, total...-pipe part, 6
...Branch pipe part, 7...Through hole, 8
...Drilling tool, 9...Cutter part, 2
5...--plug, 26...--back row burial device, 27
...Cap, A, B...Pipe.

Claims (1)

[Claims] 1. A plastic saddle part 2 integrally provided with a pipe part 3 is joined to each of the mutually distant parts of a plastic pipe A for fluid transport, and both pipe parts are connected from the side of the branch pipe part 6 that communicates with the pipe part 3. The saddle portion 2 of the plastic pipe A is inserted into the saddle portion 2 of the plastic pipe A.
The through-holes 7, 7 are drilled with the drilling tool 8 in the areas surrounded by the holes, the branch pipe parts 6, 6 are connected with the bypass pipe B, and the plastic pipe A is connected to the mounting part of both saddle parts. In this method, when the bypass pipe B is removed, the cutter part 9 of the punching tool 8 is left in a state covering the through hole 7.1, and the pipe part 3 is removed from the branch pipe. After the section 6 is removed, the remaining cutter section 9 can be recovered while leakage through the pipe section 3 is prevented, and a leakage prevention stopper 25 can be inserted from the pipe section 3. The post-processing tool 26 is attached to the pipe section 3.
, the cutter part 9 is recovered and the stopper 25 is inserted, and then the post-processing tool 26 is removed from the pipe part 3, and the cap 27 for covering the opening of the pipe part 3 is then removed from the pipe part 3. 3. A method for repairing plastic pipes characterized by fixing them.