JPH02197317A - Lining method for tube and lined tube - Google Patents

Abstract

PURPOSE:To efficiently form a high-hardness lined tube in a short time by bending a lining tube of metallic sheet in the width direction, inserting it into a tube to be lined, charging fluid into the lining tube and expanding it. CONSTITUTION:The lining tube 3 of metallic sheet is supplied in a flat state from a reel 4 and bent between a pair of tube bending rollers 5a, 5b in the width direction. The tube 3 is made inserted into the tube 1 to be lined as the width of the tube 3 is smaller than the internal diameter of the tube 1 to be lined. Fluid such as water is charged into the lining tube 1 through a flexible hose 8 to expand the lining tube 3 in a tubular shape. This lining tube 3 changes into the lined tube as it is. Two metallic band sheets having a width nearly equal to a half the internal peripheral length of the tube 1 to be lined or a little smaller are put on each other and both its edge parts are welded to form the lining tube 3 to be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe lining method and a lining retubing method.

[Conventional technology]

The conventional method for lining the inside of water pipes, sewage pipes, gas pipes, crude oil transmission pipes, etc. is to use water pressure to invert the inner and outer circumferential surfaces of the tube while lining the inner and outer tubes impregnated with thermosetting resin. A tube reversal lining method is used in which the tube is inserted into a lined pipe and then the impregnated resin of the lined tube is cured to line the inside of the pipe.

The lining tube used in this tube-inversion lining method has a resin-impregnated layer made of felt (non-woven fabric) or woven fabric, and a coating film on the inner circumference when the inner and outer circumferential surfaces of the tube are inverted. It is made of sheet material laminated with resin film and molded into a tube shape. This lined tube is crushed flat and wound around a reel, and when inserted into the lined pipe, it is unwound from the reel and filled with resin. The impregnated layer is impregnated with a thermosetting resin, and then inverted and inserted into the lined pipe.

This reversal insertion of the lined tube into the lined pipe is carried out by inverting the inner and outer circumferential surfaces of the tip of the lined tube and holding it in the tube retaining ring, and in this state, pouring water into the inside of the inverted part of the lined tube. It will be done. When water is injected inside the reversed part of the lining tube in this way, the reversed part of the lining tube expands into a tubular shape due to water pressure, and the uninverted part of the lining tube is reversed by the water pressure applied to the folded part between it and the reversed part. This uninverted part is sequentially inverted from its tip side (turning part side) so that the inner circumferential surface becomes the outer circumferential surface, and the inverted part extends, and the lined tube forms the lined tube while forming the lined tube. Go into the pipe. In addition, to cure the impregnated resin in the lining tube, after inserting the lining tube over the entire length of the lined tube, high-temperature hot water is supplied into the water in the lining tube to raise the temperature of the water in the lining tube. This is done by using the heat to harden the thermosetting resin that is impregnated into the inner tube. When the thermosetting resin impregnated into the lined tube is cured, the lined tube becomes a two-layered tube whose inner wall surface is lined with the lined tube.

In addition, this tube reversal type lining method also includes a method in which the lining tube is reversely inserted into the lined pipe using air pressure, and in that case, thermosetting or photosetting resin is used as the impregnating resin for the lining retube. used and cured by steam or ultraviolet light.

[Problem to be solved by the invention]

However, in the conventional pipe lining method described above, the lining tube is impregnated with a curable resin when the lining tube is inserted into the lined pipe, and the lining tube is impregnated with the curable resin after the lining tube is inserted into the lined pipe. Because the lined tube is constructed by curing the lined tube, it takes time to impregnate the lined tube with the curable resin and harden the impregnated resin in the lined retube, which causes the problem that it takes a considerable amount of time to install the lined tube. there was. Moreover, in the pipe lining method described above, the lining pipe constructed inside the lined pipe is a hardened layer of curable resin impregnated with a lining tube mainly made of felt or woven fabric, so the strength of the lining pipe is increased. There was also a problem.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to efficiently line the inside of a lined pipe in a short period of time, and to provide a lined pipe with high strength inside the lined pipe. It is an object of the present invention to provide a pipe lining construction method that can construct a tube, and to provide a lining tube that can be easily manufactured at low cost as a lining retube used in this construction method.

[Means to solve the problem]

In the pipe lining method of the present invention, a lined retube made of a thin metal plate is formed into a flattened shape and has an outer circumference that is approximately the same as or slightly smaller than the inner circumference of the pipe to be lined. The tube is bent in a direction to make the width of the tube smaller than the inner diameter of the lined tube and then inserted into the lined tube, and then fluid is fed into the lined tube and the fluid pressure transforms the lined tube into a tubular shape. It is characterized by being expanded.

Further, the lined tube of the pipe of the present invention has a width of approximately 1/2 or slightly smaller than the inner circumference of the lined pipe.
It is characterized by stacking two strip-shaped thin metal plates and welding both side edges of the two strip-shaped thin metal plates.

[For production]

That is, the pipe lining method of the present invention is to line the inside of the lined pipe with a lining retube made of thin metal plate,
The lined retube made of thin metal sheet has an outer circumference that is approximately the same as or slightly smaller than the inner circumference of the lined tube, so the width of the lined tube when flattened is Although it is larger than the inner diameter of the lined tube, by bending the lined tube in its width direction to make the tube width smaller than the inner diameter of the lined tube, the lined retube can be inserted into the lined tube. In addition, since the above-mentioned lining tube is made of a thin metal plate, if fluid is introduced into the lining tube after inserting the lining tube into the lined pipe, this fluid pressure will expand the lining tube into a tubular shape. Because you can
1. The lined tube can be constituted by a lined tube made of thin metal plate. According to the pipe lining method of the present invention, a lined pipe can be constructed by simply inserting a lined tube made of a thin metal plate into a lined pipe and expanding this lined tube into a tubular shape using fluid pressure. Compared to the conventional lining method, which involves impregnating a retube with a hardening resin and inserting it into the lined pipe, and then curing the impregnated resin in the lined tube to construct the lined pipe, the inside of the lined pipe is lined more efficiently in a shorter time. Moreover, since the lined tube is made of a thin metal plate, a high-strength lined tube can be constructed within the lined tube.

Furthermore, since the pipe lining tube of the present invention is made by stacking two strip-shaped thin metal plates and welding the opposite edges of the two strip-shaped thin metal plates, the two edges of the two strip-shaped thin metal plates are welded. A lined tube with a flattened shape can be manufactured by simply performing the following steps, and therefore, this lined tube can be manufactured easily and at low cost.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Figures 1 to 3 show the pipe lining method of this embodiment, where 1 is a lined pipe buried underground (existing pipe or new pipe), 2 is a vertical shaft, Lined pipe 1 is vertical shaft 2
It is separated within.

Reference numeral 3 denotes a lined tube made of a thin metal plate that is inserted into the lined tube 1 and constitutes the lined tube.

This lined tube 3 has a flattened shape and has an outer circumference length that is approximately the same as the inner circumference length of the lined tube 1 or smaller than it (Mf). As shown in FIG. 2, a stainless steel tube 2 having a width approximately 1/2 or slightly smaller than the inner circumference of the lined tube 1 and having both side edges curved in an arc shape is shown in FIG.
It has a structure in which two strip-shaped thin metal plates 3a, 3a are stacked one on top of the other, and both side edges of the two strip-shaped thin metal plates 3a, 3a are butt welded. In the figure, a indicates a welded portion of two strip-shaped thin metal plates 3a, 3a. Moreover, the wall thickness of this lining tube 3 (thickness of the strip metal thin plates 3a, 3a) is 100++on in diameter.
Approximately 01 to 1.0 mm in the case of a tube that is lined with
, in the case of a lined tube with a diameter of 1500 m+m, it is approximately lO~8,0++on. This lining tube 3 is manufactured to have a length slightly larger than the lining length of the lined pipe 1, and both ends of the lining tube 3 are closed in an airtight state.

The lined tube 3 is wound around a reel 4 in a flattened state, and after being unwound from the reel 4, it is bent in the width direction and wrapped with the tube width made smaller than the inner diameter of the lined tube 1. It is inserted into the lined pipe 1.

To explain the insertion of the lined tube 3 into the lined tube 1, in FIGS. 1 and 4, 5a, 5
b is a pair of upper and lower tube bending rollers with wavy roller surfaces installed in the shaft 2 facing the lined tube insertion side end of the lined pipe 1; one tube bending roller 5a has a roller rotation mechanism; 6, and the other tube bending roller 5b is pressed with a constant pressure toward the one tube bending roller 5a by a pressure mechanism (not shown) (=I
I'm being kicked. The lined tube 3 unreeled from the reel 4 is passed from inside the shaft 2 to a pair of tube bending rollers 5a, as shown in FIG.

5b, the tube is bent into a wavy state in the width direction by the tube bending rollers 5a and 5b to make the tube width smaller than the inner diameter of the lined pipe 1, and is fed by the tube bending rollers 5a and 5b as shown in FIG. Then, as shown in FIG. 5, it is inserted into the lined pipe 1. The lined tube 3 that has entered the lined tube 1 slides on the inner wall surface of the lined tube 1 with its both side edges supported by the inner wall surface of the lined tube 1.

After inserting the lined tube 3 over the entire length inside the lined pipe 1, as shown in FIG. 2, the water pump 7 is connected to the rear end of the lined tube 3 via a flexible hose 8. Pour water into the lining tube 3.

When water is injected into the lining tube 3 in this way, the lining tube 3 is heated from inside by water pressure as shown in FIGS. 3 and 6.
As shown in the figure, this inner tube 3 is expanded into a tubular shape.
becomes the lined pipe.

After this, both ends of the lining tube 3 protruding from both ends of the lined tube 1 are cut, and both ends of the lining tube 3 are opened. In addition, the pipe 1 whose inner wall surface has been lined in this way is lined with the next section of lined pipe 1 in the same manner as above, and then connected to the next section of pipe 1 via a connecting pipe. Connected.

That is, the pipe lining method described above lines the inside of the lined pipe 1 with a lining retube 3 made of thin metal plate,
The lined tube 3 made of a thin metal plate has an outer circumference that is approximately the same as or slightly smaller than the inner circumference of the lined pipe 1, so the lined tube 3 is flattened. The width of the lined tube 3 is larger than the inner diameter of the lined tube 1, but if the lined tube 3 is bent in the width direction to make the tube width smaller than the inner diameter of the lined tube 1, the lined tube 3 can be inserted into the lined tube 1. can be inserted. In addition, since the lined tube 3 described in item 1 is made of a thin metal plate, the lined tube 3 is connected to the lined tube 1.
If water is poured into the lining tube 3 after insertion, the lining tube 3 can be expanded into a tubular shape by this water pressure, so the lining tube 3 made of the thin metal plate can constitute a lining tube. According to the pipe lining method described above, the lining pipe 3 can be lined by simply inserting the lining retube 3 made of thin metal plate into the lined pipe 1 and expanding the lining retube 3 into a tubular shape using water pressure. Compared to the conventional lining method, which involves impregnating the lining tube with a hardening resin and inserting it into the pipe to be lined, and then curing the impregnated resin in the lining tube to form the lined pipe, it is faster and more efficient. The interior of the lined tube can be lined, and since the lined tube 3 is made of a thin metal plate made of stainless steel, a high-strength lined tube can be constructed within the lined tube 1.

Further, the lining tube 3 is made of two strip-shaped thin metal plates 3.
A, 3a are stacked and the two strip-shaped thin metal plates 3a, 3a are welded together on both sides, so the two strip-shaped thin metal plates 3a, 3a can be flattened simply by welding the edges on both sides. The lined tube 3 can therefore be produced easily and at low cost.

In the above embodiment, the lining tube 3 inserted into the lined pipe 1 is expanded by water pressure, but the lining tube 3 may be expanded by air pressure. Further, in the above embodiment, the lining tube 3 is fed into the lined pipe 1 by the tube bending rollers 5a and 5b that bend the lining tube 3 in the width direction. This can be done by passing a tension lobe into the lined pipe 1 in advance and using this lobe to pull the lined retube 3 into the lined pipe 1, or by pulling the lined tube 3 with a self-propelled vehicle and pulling it into the lined pipe. This may also be done by a method of pulling it into 1.

〔Effect of the invention〕

In the pipe lining method of the present invention, a lined tube made of a thin metal plate, which has a flattened shape and an outer circumferential length that is approximately the same as or slightly smaller than the inner circumferential length of the lined pipe, is lined in the width direction. The tube is bent to make its width smaller than the inner diameter of the lined tube and then inserted into the lined tube, and then fluid is fed into the lined tube and the fluid pressure expands the lined tube into a tubular shape. Therefore, the lined tube can be constructed by simply inserting a lined tube made of a thin metal plate into the lined tube and expanding this lined tube into a tubular shape using fluid pressure. The interior of the lined pipe can be lined more efficiently in a shorter time compared to the conventional lining method, which involves impregnating the lined tube with resin and inserting it into the lined pipe, and then curing the impregnated resin of the lined tube to form the lined pipe. Furthermore, since the lined tube is made of a thin metal plate, a high-strength lined tube can be constructed within the lined tube.

In addition, the pipe lining retube of the present invention has a width of approximately 1/2 of the inner peripheral length of the pipe to be lined or slightly smaller than that.
Since it is made by stacking two strip-shaped thin metal plates and welding the edges on both sides of the two strip-shaped thin metal plates, it is possible to create a flat lining tube by simply welding the edges on both sides of the two strip-shaped thin metal plates. The lined tube can therefore be manufactured at low cost and easily.

[Brief explanation of the drawing]

Figures 1 to 6 show one embodiment of the present invention, Figures 1 to 3 are vertical sectional side views showing the lining construction method, and Figures 4 and 5 are IV-IV of Figure 1. FIG. 6 is an enlarged sectional view taken along line IV and line v--■, and FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 1... lined pipe, 3... lined tube, 3a.
...Strip metal thin plate, 5a, 5b...Tube bending roller, 7...Water pump. Applicant's agent Patent attorney Takehiko Suzue] 5

Claims (2)

[Claims] (1) In a method of lining the inner wall surface of a lined pipe with a lined tube, a metal having a flattened shape and an outer circumference length that is approximately the same as or slightly smaller than the inner circumference length of the lined pipe. A lined tube made of a thin plate is bent in the width direction to make the tube width smaller than the inner diameter of the lined tube, and then inserted into the lined tube, and then a fluid is introduced into the lined tube. A pipe lining method characterized by expanding the lining tube into a tubular shape using fluid pressure. (2) A lining tube for a pipe used in the pipe lining method according to claim 1, comprising two metal strips each having a width of approximately 1/2 of the inner peripheral length of the lined pipe or slightly smaller than that. A pipe lining tube characterized by stacking thin plates and welding both side edges of the two strip-shaped thin metal plates.