JPH0399829A - Method for correcting pipeline - Google Patents

Abstract

PURPOSE:To perfectly bring a lining pipe into close contact with the inner wall of a deteriorated pipe by a method wherein one end of a folded tube is fixed to one end of the deteriorated pipe and a molding jig is moved to the other end of the tube while the tube is heated by introducing a heated fluid into the tube. CONSTITUTION:The left end part of a folded tube 30 is fixed to the left end part of a deteriorated pipe 38 by a fixing jig 40. The folded tube 30 is drawn in the deteriorated tube 38 and a molding jig 42 is mounted to the left end part of the tube 30 while a cap 56 is mounted to the right end part thereof. At this time, heated stream is sent into the folded tube 30 from a steam generator 48 through the molding jig 42. The folded tube 30 in the vicinity of a steam jet orifice 52 is heated to become a softened state. A taking-up winch 62 is driven to pull wire ropes 58, 26 and the molding jig 42 moves to the right. The folded tube 30 is expanded in its diameter to be pressed to the inner wall of the deteriorated pipe 38. When the molding jig 42 moves from the left end to the right end, the lining of the deteriorated pipe 38 is completed over the total length thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for rehabilitating a pipeline, and more particularly to a method for rehabilitating a pipeline by reviving an old pipe while it remains buried.

[Prior art]

The so-called STL method (Sumiton+o Tube Lini) is a method for reviving old pipes while buried.
ng) etc. are known. This construction method cleans rust bumps and deposits on the inner wall of an old pipe, then folds the tube into a small size and pulls it into the old pipe.Heating steam is sent in to expand the tube and make it fit tightly inside the old pipe. This is a construction method that applies lining to the wall surface.

[Problems to be solved by the invention] In the conventional so-called STL construction method, a folded tube is heated with a gas such as heated steam.

Since the method involves expanding the tube to fit along the inner wall of the aged pipe, it was not always possible to adhere the tube uniformly to the inner wall of the aged pipe over its entire length. In other words, since the heated steam sent into the tube accumulates at both ends of the tube, the tube may not be completely stretched in areas other than both ends, leaving wrinkles and remaining in close contact with the inner wall of the aging pipe. . If such wrinkles remained, they would create resistance to fluid passing through them, which was not desirable.

Therefore, the main object of the present invention is to provide a method for rehabilitating a pipe line that can completely bring a lining pipe into close contact with the inner wall of an old pipe.

[Means to solve the problem]

This invention includes a step of folding a tube made of synthetic resin having an outer diameter corresponding to the inner diameter of the old pipe and having a wire passed through it in the tube axis direction in a softened state by heating, and folding the folded tube into the old pipe. inserting the folded tube, expanding the diameter of one end of the folded tube by heating and fixing it to one end of the old pipe; forming a tube that is connected to a wire from the fixed end of the folded tube and has an outer diameter corresponding to the inner diameter of the tube; inserting a jig, and introducing a heating fluid through the forming jig to heat the tube;
This method of rehabilitating a pipe line includes the step of pulling a wire to move a forming jig toward the other end of the tube.

[Effect]

A tube with an outer diameter approximately equal to the inner diameter of the aging tube is heated to a softened state with a wire passed through it.

The outer diameter of the tube is then made smaller than the inner diameter of the aged pipe so that it can be folded radially and easily passed through the aged pipe.

The folded tube is drawn, for example, from one of the shafts into an old pipe whose inner wall surface has been cleaned.

Then, while the tube is inserted into the aged pipe, one end of the tube is heated and expanded in diameter. Thereafter, one end of the tube is fixed to one end of the old tube, for example, by means of a crocodile barb.

Next, a molding jig having an outer diameter approximately equal to the inner diameter of the tube is inserted into one end of the fixed tube. Note that before inserting the molding jig, the molding jig and the wire inserted into the tube are connected. The other end of this wire is connected to a pulling device, such as a winch, located in the other shaft.

In this state, a heating fluid such as heated steam is introduced into the tube via the molding jig, for example from a steam outlet provided on the molding jig. Therefore, the heat of the introduced heating fluid heats the tube into a softened state. In this state, when the wire is pulled from the other end, the forming jig moves, and the folded tube is stretched, expanded in diameter, and pressed against the inner wall surface of the aged pipe by the outer diameter of the forming jig. By performing this operation from one end of the tube to the other, lining over the entire length of the old pipe is completed.

〔Effect of the invention〕

According to this invention, the method involves moving the forming jig to bring the folded tube into close contact with the inner wall surface of the old pipe.
To line an old pipe without leaving wrinkles on the lining pipe.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

Collapsible tubes for lining old pipes are manufactured by an apparatus such as that shown in FIG.

A raw material such as hard vinyl chloride is charged into the hopper 12 of the tube manufacturing apparatus 10 . The raw material is heated and molten in a melter 14 and sent to a molder 16. In the molding machine 16, a tube is formed by pouring the melted raw material into a cylindrical mold. The tube is cooled slightly and conveyed to the right by rollers 18.

On the other hand, a sheath pipe inlet 20 is provided between the melter 14 and the molder 16.
is provided. A sheath tube 22 disposed inside the tube is drawn through the sheath tube inlet 20. Therefore, as shown in FIG. 3, the tube 24 sent out to the right from the roller 18 has the sheath tube 22 disposed therein. Further, inside the sheath pipe 22, a wire row 1 is provided.
26 is passed. The outer diameter d of the tube 24 is set approximately equal to the inner diameter of the aged pipe to be rehabilitated.

Note that the sheath tube 22 is arranged so that the wire row 126 can be easily pulled when the tube 24 becomes the foldable tube 30.

The tube 24 sent out from the roller 18 is connected to the heater 2
Sent to 8. The tube 24 and sheath tube 22 are heated in the heater 28 and folded in the tube axis direction. For example, as shown in FIG. 4, the tube 24 is folded from a substantially heart shape into a flat shape, and the outer diameter d is made smaller. This tube 24 is wound onto a reel 32 as a folding tube 30.

The folding tube 30 formed in this way is
It is used as a lining material for old pipes laid between manholes.

Referring to FIG. 1, a dilapidated pipe 38 connecting manholes 34 and 36 is lined in the following manner.

First, before the collapsible tube 30 is drawn into the aged pipe 38, cracks and deposits are removed from the aged pipe 38 by a scraper method or a jet method.
Cleaned.

Collapsible tube 30 is then pulled into aged pipe 38. For example, the reel 32 is placed near the entrance of the manhole 34, and the old pipe 38 is
The tip of the folding tube 30 wound around the reel 32 is tied to the lobes passed through the tube. Then, when the rope is pulled from the manhole 36 side, the reel 32 is rewound, and the collapsible tube 30 is drawn into the aged pipe 38 from the manhole 34 side. When the collapsible tube 30 is completely retracted over the entire length of the dilapidated pipe 38, the collapsible tube 3
0 is truncated.

The left end portion of the folding tube 30 is expanded in diameter by, for example, heated steam, and returned to its original outer diameter d. As shown in FIG.
is fixed to the left end of the

Thereafter, a substantially truncated conical molding jig 42 is fitted into the folding tube 30 from the fixed left end.

When fitting the molding jig 42, the wire row 126 passed through the sheath tube 22 is fixed to the hook 44 provided at the center of the right side. Note that the diameter of the forming jig 42 is set approximately equal to the inner diameter dX (see FIG. 3) of the folding tube 30 in order to facilitate movement to the right side.

A steam intake port 46 is provided in the center of the left side of the molding jig 42 . Heated steam is sent into the steam intake port 46 through a steam tube 50 from a steam generator 48 located on the ground. The heated steam sent into the steam intake port 46 is passed through the collapsible tube 3 from the steam outlet 52 on the right side.
It is ejected within 0. Note that an O-ring 54 is fitted into the molding jig 42 to prevent the heated steam put into the folding tube 30 from leaking between the molding jig 42.

When the collapsible tube 30 is completely pulled into the aged pipe 38, the lobe for pulling the collapsible tube 30 into the manhole 36 is removed. As shown in FIG. 1, a cap 5 is attached to the tip of the collapsible tube 30 to prevent steam from spewing out.
6 is attached. A hole is provided in the center of the cap 56, through which the wire rope 26 can be pulled. Then, another wire row 158 is coupled to the wire row 126. The wire rope 58 is redirected by a pulley 60 and wound onto a winding winch 62 located on the ground.

After drawing the folding tube 30 into the aged pipe 38, attaching the forming jig 42 to the left end and completing the attachment of the cap 56 to the right end, the steam generator 4
Heated steam is sent from 8 into the folding tube 30 via the molding jig 42. When heated steam is spouted from the steam spout 52 of the molding jig 42, the steam spout 52
The nearby collapsible tube 30 is heated and becomes softened.

Therefore, when the winding winch 62 is driven and the wire ropes 58 and 26 are pulled, the forming jig 42 moves to the right. By moving the molding jig 42,
The collapsible tube 30 is expanded in diameter and pressed against the inner wall of the aged pipe 38.

Therefore, the lining of the inner wall of the left side of the aged pipe 38 through which the molding jig 42 has passed is completed.

In this way, when the forming jig 42 moves from the left end to the right end of the aged pipe 38, the lining of the aged pipe 38 is completed over the entire length. The sheath tube 22 is folded together with the collapsible tube 30, but as the molding jig 42 moves, the sheath tube 22 is folded even more finely and deposited on the hook 44. Therefore, when the forming jig 42 completes its movement to the right end of the aged pipe 38, the sheath pipe 2 is folded by the length of the collapsible tube 30.
2 is taken out.

Folding tube 3 to old pipe 3 as above
When the lining with 0 is completed, the finished state is checked by, for example, driving a television camera into the aged pipe 38. Then, the location of the water faucet should be set as necessary.
The solder coating formed by the folding tube 30 is broken with a hot iron to form an opening.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram of an apparatus for manufacturing the foldable tube used in the embodiment of FIG. 1. FIG. 3 is an illustrative cross-sectional view showing a tube in the middle of manufacturing a foldable tube using the apparatus shown in FIG. 2. FIG. 4 is a cross-sectional diagram illustrating the state in which the tube shown in FIG. 3 is folded. In the figure, 22 is a sheath pipe, 24 is a tube, 26 and 58 are wire ropes, 28 is a heater, 30 is a folding tube, 32 is a reel, 34 and 36 are manholes, 40 is a collar, 42 is a forming jig, 48 is a steam generator,
60 is a pulley, and 62 is a winding winch.

Claims (1)

[Claims] a) A step of folding a synthetic resin tube having an outer diameter corresponding to the inner diameter of the old pipe and having a wire passed through it in the tube axis direction while being heated and softened; b) Folding c) inserting the folded tube into the aged pipe; c) heating and enlarging one end of the folded tube and fixing it to one end of the aged pipe; d) inserting the wire from the fixed end of the folded tube. inserting a forming jig connected to the tube and having an outer diameter corresponding to the inner diameter of the tube; and e) pulling the wire while introducing a heating fluid through the forming jig to heat the tube. A method for rehabilitating a pipe line, comprising the step of moving the forming jig toward the other end of the tube.