JPH02275195A - Repairing tool for underground piping line - Google Patents

Abstract

PURPOSE:To grind a bent portion and/or a stepoff portion so as to ensure the inner diameter of a pipe by providing a bullet-shaped guide part formed at the end of a repairing tool, a cylindrical shell part leading to the guide part and multiple cutting edges. CONSTITUTION:A cutting tool 6 is provided with a bullet-shaped guide part 6a which passes through the inside of a pipe smoothly positioned at its end. At the other periphery of a cylindrical shell part 6b leading to the guide part 6a, plural cutting edges (cutting edges) 6c are arranged in spiral and plural rows. The respective cutting edges 6c are mounted one by one so that they can be attached and removed smoothly. A piano wire rod 7 is connected behind the shell part 6b. A driving shaft 9a driven by a portable type electric motor 8 is directly connected to a hook 7a through a joint part 9b so that it can be attached and removed. It is thus possible to grind a bent portion and a stepoff portion so as to ensure the inside diameter of a pipe.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an underground conduit in which a cable lead-in conduit is formed for wiring electric power cables, telecommunication cables, etc. underground. This invention relates to a tool for repairing underground pipelines that is repaired directly from the inside of the pipe.

[Conventional technology]

Conventionally, underground conduits for wiring power cables, communication cables, etc. underground are usually made by connecting multiple hume pipes, steel pipes, cast iron pipes, etc., through manholes etc. installed at predetermined intervals. The pipe is constructed by arranging multiple rows vertically and horizontally across the pits, and laying them in order underground, such as under roads, to form a conduit. In this method, the cables, etc. to be routed are selected from any empty conduit and laid.

By the way, the pipe bodies of the existing underground pipelines are in the form of multiple asbestos pipes, steel pipes, cast iron pipes, etc., connected by pipe joints between vertical holes such as manholes, and these pipes are installed under roads etc. Due to the load and vibration of vehicles passing on the road, earthquakes, aging, etc., the joint condition of the pipe joint changes, causing gaps, vertical differences, or bends in the pipe joint. If cables are bent or the constituent materials of the pipe joints deteriorate, groundwater leaks or dirt enters, resulting in problems such as impeding the ability to insert new cables into empty pipes.

Therefore, it is being considered to repair empty pipes in existing underground pipes after a certain number of years have passed by filling them with mortar or forming a resin lining coating from the inner surface of the pipes while the pipes are still in the laid state.

Various methods have been proposed for repairing the above-mentioned pipes, such as JP-A-61-103568 and JP-A-6
As shown in Publication No. 1-103569, etc., a repair resin and a pig device that pushes the repair resin from the rear are inserted into the inner surface of the pipe, and the above-mentioned Vig device is pulled with a tow rope, and the outer circumference of the pig and the inner wall surface of the pipe are separated. A lining resin layer mixed with a predetermined viscosity is formed in the gap between the
As shown in Publication No. 1, by towing a replacement pig etc. that slides in airtight contact with the inner surface of the pipe body, mortar or resin placed on the front side of the pig is pushed from the rear and the gap at the pipe joint is filled. Prior art is known in which the liquid is filled with the liquid.

[Problem to be solved by the invention]

However, in the above-mentioned prior art, when a test piece such as a bobbin is inserted in advance before repairing the inner surface of an empty pipe line, the above-mentioned repair method etc. is applied if the test piece passes through the pipe. However, if there is a bend in the pipe joint or other parts, or if the pipe joint or broken part is misaligned and there is a step above and below, the test piece will not be able to pass through, and the above-mentioned preceding There is a problem that repair methods such as technology cannot be applied.

The present invention has been proposed to address the above-mentioned problems, and is a method for repairing empty underground pipes such as hium pipes, steel pipes, cast iron pipes, etc., while they are still installed. If there is a bend or a step between the top and bottom of the pipe joint or its pond, the bend or step must be ground in advance to ensure the inner diameter of the pipe so that a test piece such as a bobbin can pass through. The purpose is to provide a tool for repairing pipelines.

[Means to solve the problem]

In order to achieve the above object, the underground pipe repair tool according to the present invention can be used to repair tools for repairing underground pipes when a bent part or a stepped part occurs in the pipe body of an underground pipe laid underground between vertical holes such as manholes. The tool for repairing the bent part or step part of the tube body from the inside while it is in the laid state has a bullet-shaped guide part formed at the tip and a cylindrical body part that continues to the guide part. and a large number of glued 111 blades arranged around the outer periphery of the body, and is characterized in that it is configured to move forward while rotating.

[For production]

Based on such a configuration, according to the present invention, there is a bent part or a stepped part in which a test piece such as a bobbin cannot pass, at a pipe joint part or other place in a pipe body which is an empty pipe of a ground F pipe. etc., and when grinding it with a repair tool, first make sure that the guide part comes in contact with the guide part.Since the guide part is not equipped with a grinding blade, there is no need to grind the inner surface of the pipe unnecessarily, and the guide part is not grounded. After the part has passed, the bent part and stepped part are ground with the grinding blade of the body part, making it possible to pass through the blocked part.

Furthermore, since the tip of the repair tool is shaped like a cannonball, it can be moved smoothly within the underground pipeline, and only the parts that need to be ground are ground, and the repair tool can be rotated smoothly.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 schematically shows one section to be repaired according to the present invention, and in the figure, reference numeral 1 indicates an underground pipe to be repaired. This underground pipe l is usually 50 mm to 3
00III11 diameter steel pipe, Huum pipe.

It is made by connecting asbestos pipes or the like to a predetermined length through a plurality of pipe joints 2. For example, they are arranged in multiple stages vertically and in multiple rows horizontally to form one pipe group (not shown). By sequentially laying pipes under roads, etc. between manholes A and B, multiple rows of pipes are formed underground.

Power cables or telecommunication cables are inserted into the underground conduit ■ above, and the empty conduits in which no cables are inserted are to be repaired among the multiple rows of conduits. .

First, when repairing the empty pipe of the underground pipe 1, the area between the manholes A and B, which are the open ports 1a and 1b on both ends of the underground pipe 1, is set as a repair unit of one section. Guide tubes 3a are provided in 1a and lb, respectively.

313 is connected, and work vehicles 21 and 22 are placed on the ground of each manhole A and B.

Then, as shown in Fig. 2, the monitoring device (in-tube television) 4 is inserted through one guide tube 3a (or 3b), or as shown in Fig. 3, from the other guide tube 3b (or 3a). The first detection process involves inserting a test piece 5 such as a bobbin with a diameter slightly smaller than the pipe diameter and performing a passage test.
It is investigated and detected whether or not there is a bent part 10a or a vertically stepped part 10b in the pipe joint part 2 or the underground pipe l shown in the figure.

As a result of the above detection process, if there is a step part 10b or the like that the test piece 5 cannot pass through inside the tube of the underground pipe 1, the step part ■0b has shifted downward as shown in Fig. 4. A grinding process is carried out in which a grinding tool 6 is inserted through one guide tube 3b, an in-tube television 4 is inserted through the other guide tube 3a, and the stepped portion 101) is monitored by the in-tube television 4 while being ground with the grinding tool 6. Ru.

That is, as shown in FIG. 5, the grinding tool 6 has a bullet-shaped guide portion 6a at its tip portion that smoothly passes through the tubular body, and the outer periphery of a cylindrical body portion 6b following this guide portion 6a is A plurality of blades (grinding blades) 6a are arranged in a plurality of rows in a spiral shape, and each of the grinding blades 8c is detachably attached.

The grinding blade 6C is made of, for example, ultra-hard high-speed steel, and is detachably attached so that the worn grinding blade 6C can be replaced each time.

A piano wire rod 7 is connected behind the body portion 6b, and a drive shaft 9a driven by a hand-held electric motor 8 inside the manhole B is attached to a hook 7a formed at the rear end of the rod 7. The two grinding tools 6 are rotated at low speed, and a pressing force is gradually applied to the grinding tool 6 from the rear, and the rod 7 is added and moved forward. A grinding process is performed.

Here, in the 1F cutting process using the tIF cutting tool 6, the cutting edge 6a comes into contact with the upper part of the underground pipe l to prevent damage to the adjacent pipe line (not shown), and to damage the pipe wall earth part and prevent the earth and sand from falling into the pipe. In order to prevent this from happening, the direction of the grinding tool 6 during grinding and the grinding situation are monitored by the in-tube television 4.

In addition, 1. If there is a tendency to damage the upper part of the pipe wall of the underground pipe 1 during the above-mentioned grinding process, immediately carry out grinding as shown in Fig. 6 [Grinding tool 1B with small side diameter]. [Grinding] When the grinding of a predetermined length is completed, the second tool 6 or 16 is pulled out, and the ground pieces and earth and sand are removed from recovery equipment such as an evacuation plate (not shown), a vacuum suction device, and a recovery container. is removed from the tube using In addition, for removing the ground chips and the earth and sand, methods such as high water pressure washing that may cause the earth and sand to enter are not used.

Further, the tip of the small-diameter grinding tool 16 has a bullet-shaped guide portion 16a, and a plurality of blades (grinding blades) 18c are provided in multiple rows in a spiral shape on the outer periphery of the cylindrical body portion tab, and are detachably provided. , the rod 7 connected to the rear part of the body part TAB is rotated by a hand-held electric motor 8, and by adding the Gatsu rod 7, the grinding point 10 of the tubular body is ground in the same way as for the large diameter one. However, if the diameter is small, one rotation of the movement will be unstable, so the pulling wire 11 can be used to return it further.
Tow through 8. After the large-diameter grinding tool 6 passes through the grinding point IO, the grinding pieces and earth and sand are removed, and a passage test is performed on the test piece 5. If there is a risk of damage to the pipeline during the grinding process, the pipe is partially filled with special mortar for reinforcement, and then the grinding process is performed again.

When the grinding process is completed by the grinding tool 6, a repair process is performed in which the grinding area is filled with mortar using a well-known mortar filling method, and after the mortar hardens, it is lined with resin to improve the adhesive strength and watertightness of the mortar. It is done.

In the above repair process, by pulling the tow rope IT with the winch 21a of the work vehicle 21, the special mortar to be injected between the pair of pigs is drawn and filled into the ground location IO after grinding in the underground conduit ■. The mortar between the pigs is pushed outward at the grinding point 10 and is filled into the grinding point IO and the stepped portion tab.

Further, as the lining resin, for example, an epoxy resin consisting of a base resin and a curing agent is used, and the inner surface of the pipe is lined with a pig.

〔Effect of the invention〕

As explained above, according to the tool for repairing underground pipes according to the present invention, bends, stepped parts, etc. are prevented from occurring at the pipe joints and other locations within the tube that is an empty pipe of the underground pipe. If it is, it can be ground and repaired to make it conductive.

In particular, since the repair tool is provided with a guide portion that does not have a cutting blade at its tip, it has good mobility within the underground pipeline and does not need to be ground in areas that do not require grinding. Furthermore, since the guide portion is provided, the entire repair tool rotates smoothly, allowing efficient repair work to be carried out.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view schematically showing one section to be repaired according to the present invention, Figs. 2 and 3 are explanatory diagrams of the detection process performed before the repair method according to the present invention, and Fig. 4 is a grinding An explanatory diagram showing the start of the process, Fig. 5 is a side view of the grinding tool, Fig. 6 is an explanatory diagram of work using another grinding tool, and Figs. 7 (a) and (b) are areas to be repaired. FIG. 2 is a schematic explanatory diagram showing a repair method when the curved portion is a bent portion. A, B...manhole, l...underground pipe, 2...
Pipe joint part, 4... TV in pipe, 5... Test piece, 6゜16... Grinding tool, 10... Grinding location, 11
...Tow rope. Patent applicant Hatsuko Co., Ltd. Agent Patent attorney Noboru Kobashi Ukiyo

Claims (1)

[Claims] When a bent part or a step part occurs in the pipe body of an underground conduit laid underground between vertical holes such as manholes,
The tool for repairing the bent part or step part of the tube body from the inside while it is in the laid state has a bullet-shaped guide part formed at the tip and a cylindrical body part that follows this guide part. and a large number of grinding blades disposed around the outer periphery of the body, the repair tool being configured to move forward while rotating.