JPS63296923A - Lining technique of tubular body - Google Patents

Abstract

PURPOSE:To perform necessary lining reliably and safely, by heating and expanding a lining material inserted into a tubular body through an elastic bag. CONSTITUTION:A lining material 2 composed of thermoplastic resin is inserted into a tubular body 1 and an elastic bag 3 whose heat-resistant and airtight tip has been sealed is inserted within the lining material 2. The inside of the elastic bag 3 is provided with a hose 4, the tip of the hose 4 is connected with the tip part of the bag 3 and the other end is communicated with a boiler 5. Steam is introduced into the elastic bag 3 through the hose 4 from the boiler 5 and the tubular lining material 2 is softened. When a compressor 8 is driven by leaving a directional control valve 6 closed, and the elastic bag 3 is expanded, then the lining material 2 is stuck close to an inner wall of the tubular body 1. The lining material 2 is cured by cooling the steam within the bag 3 while keeping that state and an expected lining is made reliable and safe.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a pipe lining method.

(Prior Art) Conventionally, as a method of lining pipe bodies such as gas pipes and water pipes, a tubular lining material made of thermoplastic resin such as polyethylene or vinyl chloride is inserted into the pipe body, and both ends of the tubular lining material are By sealing it with a stopper and introducing high-temperature, high-pressure fluid into the tubular lining material,
The present applicant has proposed a method of lining the tubular body by inflating this tubular lining material and pressing it against the inner wall of the tubular body, and cooling the fluid while maintaining this expanded state to harden the tubular lining material. has already been proposed by. Therefore, in this construction method, it is necessary to plug both ends of the tubular lining material to seal it.

(Problems to be Solved by the Invention) However, no matter how tightly the tubular lining material is sealed, the lining material softens and expands due to the high temperature and high pressure fluid, so it is difficult to ensure that the sealed portion is completely sealed. There is a danger that high-pressure fluid may spray out from there. On the other hand, it has been considered to prevent the expansion of the sealed part by spraying cold water or the like on the sealed part, but this does not completely solve the problem described in L.

The present invention was made in view of the problem described in L, and its purpose is to provide a pipe lining method that can reliably and safely perform the required lining without causing sealing problems. It is in.

(Means for Solving the Problems) In order to achieve the above object, the present invention inserts a tubular lining material made of thermoplastic resin into a tube to be lined, and seals the tip inside the tubular lining material. inserting an elastic bag, and introducing a high-temperature, high-pressure fluid into the elastic bag to heat and expand the tubular lining material;
Thereafter, the tubular lining material was cooled and hardened while maintaining the expanded state, thereby lining the inner circumferential surface of the tube.

(Function) According to the configuration described above, since the tubular lining material inserted into the tube body is heated and expanded through the elastic bag, there is no need to configure a closed system by itself, and therefore the tubular lining material inserted into the tube body is heated and expanded through the elastic bag. Problems with sealing at both ends may occur; the required lining must be done reliably and safely.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIGS. 1 and 2I2I are cross-sectional views showing the procedure of a first embodiment in which a tubular body 1 is lined with a tubular lining material 2 by the lining method according to the present invention.

As shown in FIG. 1, a lining material 2 made of thermoplastic resin having an outer diameter somewhat smaller than the inner diameter of the tube l
inserted within.

Next, as shown in FIG. 2, an elastic bag 3 having high heat resistance and airtightness is inserted into the tubular lining material 2 by a traction method. 1. Inside the elastic bag 3, a heat-resistant hose 4 having a plurality of openings near its tip is provided.
Its tip is connected to the tip of the elastic bag 3, and the other end communicates with the boiler 5. The boiler 5 also communicates with a guide pipe 7 via a switching valve 6. Therefore, a closed system is formed by the elastic bag 3, the guide pipe 7, and the switching valve 6, and the compressor 8 is communicated with this through the pressure gauge 9. By driving the compressor 8, the closed system is formed. The pressure within the system is adjusted to an arbitrary pressure.

As shown in FIG. 2, the boiler 5 is operated to introduce hot water or steam into the elastic bag 3 through the heat-resistant hose 4, and water or steam at a relatively lower temperature than the inside of the guide vibe 7 is introduced. When the steam is returned to the boiler 5 through the open switching valve and this process is repeated, the temperature of the elastic bag 3 immediately rises, and the tubular lining material 2 in contact with it is heated and softened. In addition, if the melting point of the tubular lining material 2 or vinyl chloride exceeds 100°C,
If the material is made of a material that obtain. When the tubular lining material 2 is sufficiently softened in this way, the compressor 8 is driven with the switching valve 6 closed to pressurize and inflate the elastic bag 3. It is pressed against the inner wall and becomes in close contact. By naturally or forcedly cooling the hot water or steam inside the elastic bag 3 while maintaining this state, the tubular lining material 2 made of thermoplastic resin hardens while remaining in close contact with the inner wall of the tubular body 1. Thereafter, the required lining is completed by removing the elastic bag 3 from the tubular body l.

As shown in E, the tubular lining material 2 is not heated and expanded by directly sealing high-temperature, high-pressure fluid inside it as in the past, but is heated and expanded by itself or by an elastic bag 3 constituting a closed system. Due to heating and expansion through the tube, sealing problems of the tubular lining material 2 may occur, ensuring that the required lining is made one safe.

Next, modified embodiments of the present invention will be described with reference to the drawings from FIG. 3 onwards.

FIG. 3 is a cross-sectional view of a site where a buried old pipe 11 is being lined by the lining method according to the present invention. It shows how short pipes 12 as tubular lining materials having an outer diameter somewhat smaller than the inner diameter of the old pipe 11 are inserted one by one into the old pipe 11 through the manhole 10. The short tube 12 as a tubular lining material is made of thermoplastic resin such as polyethylene or vinyl chloride.

To explain the order of insertion f of the short tube 12, first insert the hook 1 at the tip.
3, the other end of which is wound around the winch 14, is passed through the aged pipe 11 so that it reaches the hook 13 or the left opening of the aged pipe 11 in FIG. Next, the short pipe 12 is fitted into the old pipe 11, and the hook 13 is passed through the short pipe 12 and hung on a cloisonné-shaped stopper 16 applied to the rear of the short pipe 12 in the insertion direction. FIG. 4 is a view taken in the direction of the arrow in FIG. 12 shows an example of the engaged state of the stop A16 and the hook 13 at the rear of the vehicle. By driving the winch 14 in this state and winding up the wire 15, the short pipe 12 is pulled and inserted into the aged pipe 11. If the insertion of this short pipe 12 is made upward, the winch 14
Reverse the wire a little to loosen the wire 15, remove the hook 13 from the stopper 16, apply the stopper 16 to the rear end of the next short pipe 12, and repeat the same operation, one short pipe at a time. It is inserted into the aged pipe 11 to form a short pipe connector 17 (see FIG. 6) that passes through the aged pipe 11. 5. For example, as shown in FIG. 5, the tail of the leading short tube 12a and the tip of the trailing short tube 12b are formed to fit into either the former or the latter, so the airtightness of this joint part is good. Become.

Next, as shown in FIG. 6, an elastic bag 3 having high heat resistance and airtightness is inserted into the short tube connector 17 by the reverse insertion method. (Alternatively, the wire 15 and the hook 13 are used to insert the elastic bag 3 into the short tube connector 17 by pulling it with the winch 14.) As in the first embodiment, the inside of the elastic bag 3 is is provided with a heat-resistant hose 4, the tip of which is connected to the tip of the elastic bag 3, and the other end communicates with the boiler 5. Thus, a closed system is formed by the elastic bag 3, the guide vibe 7', and the switching hull processor, and is communicated with this via a compressor 8 or a pressure gauge 9. Hereinafter, the lining of the aged pipe 11 is completed in the same f-order as in the first embodiment, and it is determined whether the same effect as that obtained in the first embodiment can be obtained in this modified embodiment. In particular, since the tubular lining material is constituted by the short pipe connecting body 17 formed by joining together a plurality of short pipes 12, it is possible to obtain the effect that the transportability and handling properties thereof are improved.

(Effects of the Invention) As is clear from the following description, according to the present invention, the tubular lining material is heated and expanded either through itself or through the elastic pack constituting the closed system, so that the seal E of the tubular lining material is improved. This problem does not arise, and the effect is that the desired lining can be carried out reliably and safely.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing the construction method according to the present invention in the order of its steps; FIGS. 3, 6, and 7 are cross-sectional views showing modified embodiments of the present invention in the order of their steps; FIG. 3 is a view taken in the direction of arrow A in FIG. 3, and FIG. 5 is a partial sectional view of the short pipe connecting body. l... Pipe body, 2... Lining material, 3... Elastic tube, lO... Manhole, 11... Old pipe, 1
2...Short pipe, 17...Short pipe connection body.

Claims (1)

[Claims] 1) A tubular lining material made of thermoplastic resin is inserted into the tube to be lined, an elastic bag with a sealed tip is inserted into the tubular lining material, and the elastic bag is A high-temperature, high-pressure fluid is introduced into the tube to heat and expand the lining material, and then the tubular lining material is cooled and hardened while maintaining the expanded state, thereby lining the inner circumferential surface of the tube. This pipe lining construction method is characterized by: 2) The tubular body lining construction method according to claim 1, wherein the tubular body tubular lining material is constructed by joining together a plurality of short tubes divided into one piece.