JPH06114939A - Method for repairing conduit - Google Patents

Abstract

PURPOSE:To provide a method for repairing a conduit in which a conduit of a large bore or a noncircular section or a conduit for receiving a large hydrostatic or external pressure can be easily lined at a low cost. CONSTITUTION:A method for repairing a conduit comprises the steps of inverting and inserting tubular nonwoven fabric 2 covered on an outer periphery with a film 3 having high sealability into the conduit 1 by hydraulic pressure, then inserting a tubular lining material 4 into the fabric 2, operating hydraulic pressure into the material 4 to cure curable resin impregnated in the material 4 while pressing the material 4 and the fabric 2 to the inner periphery of the conduit 1. Since the fabric 2 is interposed between the conduit 1 and the material 4, even in the case of the conduit 1 having a large bore, the material 4 having a thinner thickness than prior art can be used. Further, since the fabric 2 and the material 4 are separately inserted into the conduit 1, the conduit 1 can be easily lined at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline repairing method suitable for repairing pipelines having a large diameter and a non-circular cross section, and pipelines subjected to large water pressure or external pressure.

[0002]

2. Description of the Related Art When a pipeline such as a sewer pipe buried in the ground is deteriorated, a pipeline repairing method for repairing the pipeline by lining the inner peripheral surface of the pipeline without excavating the pipeline. Has already been proposed and put to practical use (for example, JP-A-60
No. 242038). That is, this pipe repairing method is, for example, inserting a flexible pipe lining material impregnated with a thermosetting resin while reversing the pipe by hydraulic pressure, and pressing it against the inner peripheral surface of the pipe, , The pipe lining material is heated by steam or the like to make hot water, and the thermosetting resin impregnated in the pipe lining material is hardened by the hot water to cure the inner peripheral surface of the pipe line. It is a method of lining with wood. Various other pipeline repair methods have been proposed (Japanese Patent Publication No. 55).
-43890, JP-B-58-39646, JP-A-1
-148530 and Japanese Patent Application Laid-Open No. 2-17123).

By the way, when pipe lining is carried out by the above-mentioned construction method, water pressure or external pressure acts on the cured pipe lining material, so that the thickness of the pipe lining material is
It is determined in consideration of the acting water pressure and external pressure, the cross-sectional shape of the pipe line, the strength of the pipe lining material, and the like.

[0004]

However, it is particularly used for lining pipelines having a large diameter (φ600 m / m to 3000 m / mφ) and pipelines having a non-circular cross section, and pipelines that receive large water pressure or external pressure. The design thickness of the pipe lining material is 3
It reaches 0 m / m to 100 m / m, which not only causes difficulty in construction but also increases construction cost.

Further, especially for the lining of corrugated pipes, the pipe lining material has a thick portion and a thin portion due to the unevenness of the inner surface of the pipe, which makes the design of the pipe lining material difficult.

The present invention has been made in view of the above problems, and an object of the present invention is to easily and inexpensively use a large-diameter or non-circular pipe section or a pipeline that receives large water pressure or external pressure. The purpose of the present invention is to provide a pipeline repairing method that can apply lining to the pipe.

[0007]

In order to achieve the above object, the method of the present invention is designed so that a tubular non-woven fabric whose outer peripheral surface is covered with a film having high airtightness is inverted and inserted into a duct by fluid pressure, A tube lining material obtained by impregnating a resin absorbent with a curable resin is inserted into the tubular non-woven fabric, and a fluid pressure is applied to the inside of the tube lining material to press the pipe lining material and the tubular non-woven fabric against the inner peripheral surface of the duct. It is characterized in that the curable resin impregnated in the pipe lining material is cured as it is.

Further, the method of the present invention is characterized in that holes are formed in the cured pipe lining material and groundwater passing through the tubular non-woven fabric is discharged into the pipeline through the holes. To do.

[0009]

According to the present invention, since the tubular non-woven fabric is interposed between the pipe line and the pipe lining, the substantial lining thickness for the pipe line is a value obtained by adding the thickness of the tubular non-woven fabric to the thickness of the pipe lining material. For the lining of large-diameter pipes, it is possible to use pipe lining materials that are thinner than before, and since the tubular non-woven fabric and the pipe lining material are inserted into the pipes separately, the pipes of large diameter The lining can be performed at a low cost with good workability even for a pipe having a non-circular cross section.

Further, for example, in a pipe line which is buried under a road and receives a large external pressure, the tubular non-woven fabric interposed between the pipe line and the pipe lining material serves as a cushioning material to absorb and relax external pressure (particularly, live load). Therefore, the thickness of the pipe lining material may be thinner than the conventional one, and the construction can be performed easily and inexpensively.

Further, in a pipeline that receives a large water pressure, groundwater accumulated between the pipeline and the pipe lining material flows through a tubular non-woven fabric having good water permeability, and is discharged into the pipeline from a hole or the like formed in the pipe lining material. As a result, the water pressure acting on the pipeline is reduced, and the same effect as described above can be obtained. In addition, since the tubular non-woven fabric blocks the passage of sediment contained in groundwater, the outflow of sediment around the pipeline can be prevented.

In addition, if a tubular non-woven fabric having a small elongation is used, the tubular non-woven fabric can be made to function as a mold for a pipe lining material, and can be easily applied to corrugated pipes having irregularities on the inner surface or pipe lines having defective portions. The lining can be installed on.

[0013]

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

1 to 3 are sectional views showing the method of the present invention in the order of steps, FIG. 4 is an enlarged sectional view taken along the line AA of FIG. 3, FIG. 5 is a partial perspective view of a tubular nonwoven fabric, and FIG. 6 is a pipe lining material. It is a partial perspective view of FIG.

In the figure, reference numeral 1 designates a pipeline buried in the ground, groundwater invades from joints a and b of the pipeline 1, and part c of the pipeline 1 is missing. There is.

Thus, in the method of the present invention, as shown in FIG. 1, the tubular nonwoven fabric 2 is inverted and inserted into the conduit 1 by an arbitrary fluid pressure such as air pressure.

The tubular nonwoven fabric 2 has a thickness of 1 m / m to 9 m.
/ M polyester, polypropylene, rayon, acrylic, etc. are formed into a tubular shape by punching, spunbonding, etc., and the outer peripheral surface thereof is polyethylene, polyurethane, vinyl chloride, polyethylene / nylon as shown in FIG. It is covered with a highly airtight plastic film 3 having a thickness of 0.1 m / m to 0.3 m / m made of a copolymer, ethylene vinyl alcohol or the like.

When the tubular non-woven fabric 2 is reversely inserted over a predetermined length (or full length) of the conduit 1, as shown in FIG. Similarly, the pipe lining material 4 is reversed and inserted into the nonwoven fabric 2 by fluid pressure. The pipe lining material 4 may be inserted into the tubular nonwoven fabric 2 by pulling.

By the way, the pipe lining material 4 is shown in FIG.
As shown in FIG. 3, the outer peripheral surface of the resin absorbent 5 made of a tubular nonwoven fabric having a thickness of 3 m / m to 60 m / m has a thickness of 0.1 m / m to
The resin absorbent 5 is formed by covering with a plastic film 6 having a high airtightness of 0.5 m / m, and the resin absorbent 5 is impregnated with a curable resin. The materials of the resin absorbent 5 and the plastic film 6 in the pipe lining material 4 are the same as those of the tubular nonwoven fabric 2 and the plastic film.

Then, as shown in FIG. 3, when the inverting insertion of the pipe lining material 4 into the tubular nonwoven fabric 2 is completed over the predetermined length (or full length) of the pipe line 1, the pipe lining material 4 is formed.
The fluid pressure inside is kept as it is, and the tubular nonwoven fabric 2 and the pipe lining material 4 are kept pressed against the inner peripheral surface of the pipe passage 1. Then, while maintaining this state, the curable resin impregnated in the resin absorbent 5 of the pipe lining material 4 is heated by an arbitrary method (when the curable resin is a thermosetting resin) and cured. Then, as shown in FIG. 4, the inner peripheral surface of the pipe 1 is lined and repaired by the cured pipe lining material 4 and the tubular nonwoven fabric 2 interposed between the pipe lining material 4 and the pipe 1.

As described above, according to the method of the present invention, the conduit 1
Since the tubular non-woven fabric 2 is interposed between the pipe lining material 4 and
The substantial lining thickness for the pipe line 1 is a value obtained by adding the thickness of the tubular non-woven fabric 2 to the thickness of the pipe lining material 4, and even if the pipe line 1 has a large diameter, the thickness is smaller than the conventional one. Since a thin pipe lining material 4 can be used, and since the tubular nonwoven fabric 2 and the pipe lining material 4 are separately inverted and inserted into the pipe line 1 (see FIGS. 1 and 2), the lining for the pipe line 1 can be reduced. It can be performed easily and at low cost. Further, the pipe line 1 having a non-circular cross section as shown in FIG. 7 can be similarly lined.

Further, even if the pipe line 1 is buried under a road, for example, and a large external pressure acts on the pipe line, the tubular nonwoven fabric 2 interposed between the pipe line 1 and the pipe lining material 4 Serves as a cushioning material to absorb and relieve external pressure (particularly, live load), so that the thickness of the pipe lining material 4 can be made thinner than before, and an easy and inexpensive lining can be constructed.

Further, for example, when the pipeline 1 shown in FIG. 7 is to receive a large water pressure, FIG. 7 and FIG. 8 (FIG.
, As viewed in the direction of arrow B), a plurality of circular holes 7, 7 ... Napit P (= 3m-1
0 m) and peel off the plastic film 3 in the portion where the circular holes 7, 7 ... Are drilled, the tubular non-woven fabric 2 having good water permeability is accumulated between the pipe line 1 and the pipe lining material 4. Since the groundwater is discharged into the pipeline 1 (pipe lining material 4) through the circular holes 7, 7 ... Bored in the pipeline lining material 4, the water pressure acting on the pipeline 1 is reduced, and the pipeline 1
Also, the lining can be easily and inexpensively applied. In addition, since the tubular nonwoven fabric 2 blocks the passage of the sediment contained in the groundwater, the outflow of the sediment around the pipeline 1 is prevented.

If a tubular non-woven fabric 2 having a small elongation is used, the tubular non-woven fabric 2 can be made to function as a mold for the pipe lining material 4, and the corrugated pipe having irregularities on the inner surface or FIGS. Defect part c as shown in
The lining can be easily applied even to the pipe line 1 having a gap.

[0025]

As is apparent from the above description, according to the present invention, a tubular non-woven fabric whose outer peripheral surface is covered with a film having high airtightness is reversely inserted into a pipe line by fluid pressure, and then a tubular resin is formed. A tube lining material obtained by impregnating an absorbent material with a curable resin was inserted into the tubular non-woven fabric, and a fluid pressure was applied to the inside of the tube lining material to press the tube lining material and the tubular non-woven fabric against the inner peripheral surface of the duct. As it is, the curable resin impregnated in the pipe lining material is cured, so it is possible to easily and inexpensively lining pipes with large diameters and cross-sections that are non-circular and pipes that receive large water pressure or external pressure. The effect that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the method of the present invention in the order of steps thereof.

FIG. 2 is a cross-sectional view showing the method of the present invention in the order of steps thereof.

FIG. 3 is a cross-sectional view showing the method of the present invention in the order of steps.

FIG. 4 is an enlarged sectional view taken along line AA of FIG.

FIG. 5 is a partial perspective view of a tubular nonwoven fabric.

FIG. 6 is a partial perspective view of a pipe lining material.

FIG. 7 is a vertical cross-sectional view of a conduit having a non-circular cross section.

8 is a view in the direction of arrow B in FIG.

[Explanation of symbols]

 1 Pipeline 2 Tubular Nonwoven 3 Plastic Film 4 Pipe Lining Material 5 Resin Absorbing Material 6 Plastic Film 7 Circular Hole

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display area B29L 23:22 4F

Claims (2)

[Claims] 1. A pipe lining material obtained by inverting and inserting a tubular non-woven fabric, the outer peripheral surface of which is coated with a film having high airtightness, into a pipe line by fluid pressure and then impregnating a curable resin into a tubular resin absorbent material. Is inserted into the tubular non-woven fabric, and the fluid pressure is applied inside the pipe lining material to cure the curable resin impregnated into the pipe lining material while pressing the pipe lining material and the tubular non-woven fabric against the inner peripheral surface of the pipe line. A pipeline repairing method characterized by: 2. The cured pipe lining material is provided with holes, and groundwater passing through the tubular nonwoven fabric is discharged into the pipeline through the holes. Pipe repair method.