JPH02199387A - Regenerating method for defective pipe and regenerating tube - Google Patents

Abstract

PURPOSE:To regenerate a defective pipe without destroying a manhole by inserting a regenerating tube into an existing pipe, filling compressed air through an air filling port to inflate it in an air pillow shape, filling mortar through a mortar filling port, and cutting off both ends after mortar is solidified. CONSTITUTION:For the construction of a regenerating tube Q1 made of synthetic resin and having plasticity, a draw net 20 is inserted into an existing pipe 21, an end section is tied to the draw net fitting hole 19 of the tube Q1, and the tube Q1 is pulled into the existing pipe 21. Compressed air is filled through an air filling port 16 to inflate it, a plug is applied to the filling port 16, then mortar is filled through a mortar filling port 17. When mortar is solidified, it is cut off at the portion of the point P, and a regenerated new pipe in close contact with the inner wall of the existing pipe 21 is formed. A small-diameter pipe or a bent pipe can be simply constructed if a draw net can be inserted into the existing pipe 21 according to this method.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention rehabilitates defects and troubles such as corrosion, cracks, leakage at joints, and reduced flow rate in fire-fighting water pipes, industrial water pipes, water and sewage pipes, etc. It concerns the construction method and the rehabilitation tube used in its implementation.

[Prior art and its problems]

In the past, when this type of pipeline became old or unevenly settled, it was excavated and replaced with a new one.

This not only increased construction costs, but also caused problems for residents during the construction period.

In order to solve this problem, the following construction methods have recently been considered and some have been implemented.

(1) A construction method in which a pneumatic pile is inserted into the pipe at the leakage point to form a receiver, and then a hardening material is injected from the leakage point to stop the water. (referred to as the APG method) (2) A method of lining the inner surface of the pipe with epoxy resin after draining water;
(Lining method) (3) As shown in Figure 1, the lining tube 1 with adhesive applied to its inner surface is inverted and fixed to the base of the guide tube 2, and compressed air is injected from the compressor 3 to line the lining tube one by one. 1 is rolled out and glued to the inner wall of the pipe for lining.

As the adhesive, there are two methods: a method using a two-component mixture and room temperature curing type epoxy resin, and a method using a heat curing adhesive.

(4) As shown in Figure 2', flexible polyethylene pipe 4
The above method has been proposed and has been implemented in some cases (1).
) and (2) can be used for pipes that are large enough for people to enter, but they are not suitable for small diameter pipes, and method (3) requires no ground preparation. If it is complete,
In addition to the problem of peeling, there were other problems such as the unit cost per unit length being the highest.

Furthermore, the construction method (4) not only has the disadvantage that it cannot be applied to curved pipes, but also the method shown in Figure 1, which involves destroying and expanding the manhole at the intake part to form part A or B, which requires construction work. The disadvantage is that the man-ball must be constructed again after the game is over.

[Problem to be solved by the invention]

Therefore, the present invention eliminates the need to destroy manholes, and
This paper attempts to propose a rehabilitation method for defective pipelines that can be applied to small-diameter pipes and bent pipelines, and a rehabilitation tube to be used for the construction.

[Means to solve the problem]

The present invention was made to solve the above problems,
The first invention provides a refurbished tube in which the inner and outer tubes are bonded at appropriate locations, both ends are closed, and an air inlet to the inner tube and a mortar inlet to the space formed between the inner and outer tubes are provided. , insert it into the existing pipe, first inject compressed air into the air injection port to expand it into an air pile shape, then inject mortar into the mortar injection port, and after the mortar has solidified, cut both ends to make the renovated new pipe. This is a construction method in which it is formed inside an existing pipe.

The second invention uses a refurbished tube in which a concavo-convex tube is bonded to the outer surface of the inner tube, both ends are closed, and an air inlet is provided to the inner tube. Then, compressed air is injected into the air inlet to expand it into an air pile shape. Next, mortar is injected into the gap formed between this rehabilitation tube and the existing pipe, and after the mortar has solidified, This method involves cutting both ends of a rehabilitated tube to form a new rehabilitated pipe within the existing pipe.

The second invention is a construction method that uses a refurbished tube with a textured sheet adhered to the outer surface of the inner tube, but an outer sheet is further adhered to the outer surface of the inner tube, and the inner tube and outer sheet are bonded together as in the first invention. This construction method involves injecting mortar into the voids formed between pipes to form a new renovated pipe.

Note that the inner and outer tubes may be tubular from the beginning, or
The sheet may be made into a tubular shape by gluing both sides of the sheet.

[For production]

Since the rehabilitation tube is flexible, it is easy to pull it into the existing pipe without destroying the manhole on the insertion side as in the case of conventional pipes, and even in the case of a bent pipe, it is possible to pass the towline through the existing pipe. If possible, it is possible to form a renovated new pipe.

Furthermore, if the new pipe becomes obsolete, it can be removed relatively easily.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

1. FIGS. 3 to 7 show explanatory diagrams of the structure and construction method of the rehabilitation tube in Example 1, and the rehabilitation tube has the following structure.

Figure 3 is a plan view of the rehabilitation tube Q, and Figure 4 is its X-
The X-ray cross-sectional view shows the structure of the refurbished tube Q: an outer synthetic resin tube 12 is stacked on the outer side of an inner synthetic resin tube 11, point welded 13 in a staggered manner, and both ends are sealed 14, 15 to close. An air inlet 16 communicating with the inner tube 11 and a mortar inlet 17 for injecting mortar into the gap 18 formed between the inner and outer tubes are provided at the - end, and a copper mounting hole 19 is provided at the other end. It has been established.

Since this rehabilitated tube Q has plasticity, when constructing it, first pass the dragnet 20 through the existing pipe 21 as shown in FIG.

Connect the rehabilitation tube Q1 to the copper installation hole 19 of the existing pipe 21.
22 in the figure is the roller that pulls in.

Once the rehabilitation tube Q has been drawn in, compressed air is injected from the air inlet 16 to expand it, and after the air inlet 16 is plugged, remortar is injected into the mortar inlet 17. do.

FIG. 7 shows the changes from the time when the rehabilitation tube Q is drawn to the time when mortar is poured after expansion.

Once the mortar has solidified, the portion at point P is cut, and a refurbished new pipe that is in close contact with the inner wall of the existing pipe 21 is completed.

The present invention can be easily constructed even in small diameter pipes or curved pipes as long as the pipes can be inserted through the copper 20.

Embodiment I FIGS. 8 to 10 show different embodiments. In this case, as the rehabilitation tube Q2, as shown in FIG.
Both sides and both ends of the stacked tubes were sealed to make the same as the retread tube Q1 of Example 1, and in this case, only the air inlet 16 was provided.

To explain how to use it, as in the case of Embodiment 1, draw it into the existing pipe 21 with a dragnet, inject compressed air from the air inlet 16 to expand it, and then plug the air inlet 16. Air pile shape, then existing pipe 21 and uneven sheet 24
Mortar is injected into the gap 25 formed between the two. In this case, a plugging seal 27 is applied to the parts other than the mortar injection part.

It is the same as in the case of Reference 1 that both ends of the mortar are cut after hardening.

Kotabi ■Main Figures 11 to 13 are variations of Example 2, and the clogging seal 2
7, synthetic resin sheets T-23 and T-28 are adhered to both sides of the uneven sheet 24, and the uneven sheet 24
A mortar injection port 17 is provided for injecting mortar into the gap formed between the synthetic resin sheet 23 or 28.

Since the construction method of this embodiment can be easily inferred from the explanation of the first embodiment, the explanation thereof will be omitted.

〔Effect of the invention〕

According to the present invention, it is possible to construct manholes without destroying them, it is possible to repair and rehabilitate from large diameter pipes to small diameter pipes, it is also possible to perform construction on curved pipes, and it is possible to perform construction at a lower cost than conventional methods. Together, this is an excellent method for rehabilitating defective pipelines.

Moreover, the manufacturing method of retreaded tubes, which involves gluing synthetic resin sheets, has the advantage that long tubes can be provided at low cost.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the conventional construction method, Figure 3 is a plan view of the rehabilitated tube in the embodiment of the present invention, Figure 4 is a sectional view taken along the line x-X, and Figures 5 and 6 are An explanatory diagram of the construction method of Example 1, FIG. 7 is a longitudinal side view of Example 2, FIG. 8 is a longitudinal front view of the same, and FIG. 10 is a perspective view showing the structure of the rehabilitation sheet used in Example 2. 11 is a longitudinal side view of Example 3, FIG. 12 is a longitudinal front view thereof, and FIG. 13 is an enlarged sectional view showing the structure of the retreaded sheet used in Example 3. 1... Lining tube 2... Guidance tube 3... Compressor 4... Flexible polyethylene pipe 5... Winch Q,... Rehabilitation tube 11... Inner tube 12... Outer tube 13...Point adhesion 14, 15...Seal 16...Air inlet 17...Mortar inlet 18...Void 19...Seine attachment hole 20...Draw line 21...・Existing pipe 22...Roll 23...Synthetic resin sheet 24...Irregular sheet 25...Gap 26...Mortar injection nozzle 27...Clogging seal 28...Synthetic resin sheet No. Figure Figure I Figure (IL) (b) (C) Figure Figure Figure Figure Figure Figure Figure Figure 24...Concave and convex sheet 25...Gap 26...Mortar injection nozzle 27...Eye =Kichi Seal 28...Synthetic Resin Sheet Procedure Amendment (Method) % Formula % 1. Indication of the incident Heisei Patent Application No. 16183 CI) We will amend the statement on page 10, line 12 of the specification. B2) Edit “Figure 7 J” on the same 13th line. (3) Edit “Figure 8” on the same 14th line. “No. 6” [Fig. 8] “Fig. 9 J Relationship between “No. 7” and amendment and amendment cases Patent applicant rt 3-62-47 Azamino, Midori-ku, Yokohama, Kanagawa Prefecture Name (Name) ) Akira Saito
Date of Hikorijin amendment order: April 25, 1999

Claims (6)

[Claims] (1) Glue the inner and outer tubes at appropriate locations, and
A rehabilitated tube with both ends closed and an air inlet to the inner tube and a mortar inlet to the space formed between the inner and outer tubes is inserted into the existing pipe, and compressed air is first injected into the air inlet. A method for rehabilitating defective pipelines, which comprises: expanding the pipe into an air pillow shape, then injecting mortar into a mortar injection port, and after the mortar has solidified, cutting both ends to form a new rehabilitated pipe within the existing pipe. . (2) Insert the refurbished tube into the existing pipe, with a concavo-convex tube glued to the outside of the inner tube, both ends closed, and an air inlet to the inner tube, and compressed air first injected into the air inlet. to expand it into an air pillow shape, then inject mortar into the gap formed between the uneven tube and the existing pipe, and after the mortar has solidified, cut both ends to form a renovated new pipe inside the existing pipe. A method for rehabilitating a defective pipeline, characterized by: (3) The inner and outer tubes are dot-bonded at appropriate intervals, both ends are closed, and a mortar injection port is provided for injecting mortar into the air gap formed between the air injection port to the inner tube and the inner and outer tubes. A retread tube featuring: (4) A refurbished tube characterized in that an outer tube with irregularities is bonded to the outside of the inner tube, both ends are closed, and an air inlet into the inner tube is provided. (5) Gluing a concave-convex tube to the outside of the inner tube, further gluing an outer tube to the outside of the concave-convex tube, closing both ends, and providing an air inlet into the inner tube;
A refurbished tube characterized in that a mortar injection port is provided for injecting mortar between the inner tube and the uneven tube or between the uneven tube and the outer tube. (6) The refurbished tube according to claim (3), (4) or (5), wherein the tube is formed by bonding both sides of the sheet.