JP2000246800A - Inversion method for tubular liner in duct repair work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly and properly introduce even a tubular liner for a large diameter tube into a duct which is connected to the lower section of a manhole, from the top of the manhole. SOLUTION: To a mouthpiece 4 which is set on a manhole 1, a tubular liner 3 and an inversion guide 5 are connected. For the inversion guide 5, a non-woven fabric or the like is formed into a vent-form, and the lower end is faced to the inlet of a duct 2. Then, while facing the lower end of the inversion guide 5 to the inlet of the duct 2, the tubular liner 3 is advanced along the inside of the inversion guide 5 while inverting the tubular liner 3 by a fluid pressure, and is guided to the inlet of the duct 2, and then, introduced in the duct 2 while inverting the tubular liner 3. Then, the tubular liner 3 is hardened while being pressed to the internal wall of the duct 2, and on the internal wall of the duct 2, a hard film by the tubular liner 3 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reversing a tubular liner which is mainly used for repairing a large-diameter pipe such as a main pipe of a sewer.

[0002]

2. Description of the Related Art When sewer pipes and other pipes buried underground are deteriorated, a method of repairing a pipe by forming a hard coating on the inner wall thereof without excavating the pipes is already known.
It has been put to practical use.

[0003] Such a pipeline repair method uses a tubular liner made by impregnating a thermosetting resin into a resin absorbent such as a non-woven fabric whose surface is film-coated, and the tubular liner is piped by fluid pressure of water or air. Introduced into the channel while inverting it, and while pressing this against the inner wall of the pipeline with fluid pressure,
The fluid is replaced with hot water to cure the thermosetting resin impregnated in the tubular liner, thereby forming a hard coating of the tubular liner on the inner wall of the conduit.

In this type of pipeline repairing method, a base for connecting one end thereof is used for reversing the tubular liner, and the base is installed inside a manhole and outside. There is.

FIG. 6 shows an example in which a base is installed in a manhole. In this case, for example, an elbow E bent into an L shape is used as the base. As shown in FIG.
Is connected to an extension tube T at one end, and one end of a tubular liner L is connected to the other end by being turned outward. Then, in a state where the connection side of the tubular liner L is directed toward the inlet of the pipeline P to be repaired, for example, water is injected as a fluid into the extension tube T drawn to the ground from the manhole, and the tubular liner L is inverted by the water pressure. It is then introduced into the pipeline P. In addition, according to this type of construction method, the pipe line P for repairing the tubular liner L can be used without waste by making the length substantially the same as the length of the pipe line P. However, when the diameter of the pipe line P becomes large, this method is applied. Since the elbow E cannot be introduced into the manhole, the repair of the pipe by this method is limited to those having a diameter of up to about 400 mm.

Therefore, a method as shown in FIG. 7, for example, is applied to repair a pipe having a larger diameter. In the figure, K is a base, and this base K is supported by a mount D provided on a manhole. As shown in the figure, one end of the tubular liner L is connected to the outer periphery of the lower part of the base K by being folded back. In this state, the tubular liner L is turned over by injecting water into the base K and turning over the manhole. Into the conduit P. According to this type of construction method, after the hardening of the tubular liner L, the portion from the base K to the inlet of the pipe P is cut off, so that the material is wasted. This has the advantage that the tubular liner can be introduced and repaired.

[0007]

However, according to the above-mentioned construction method applied to the repair of a large-diameter pipe, the pipe liner hanging from the ground into a manhole is guided to the inside of the pipe. The end must be turned in the manhole.

Therefore, a method of connecting a wire rope mainly to the advancing end of the tubular liner and winding the wire rope from the ground with a winch so that the advancing end of the tubular liner is directed to the entrance of the pipe line has been adopted. However, according to this method, a connection portion of a wire rope has to be formed in the tubular liner, and the connection operation has to be performed in a narrow place in the manhole. In addition, when water pressure is used for reversing the tubular liner, there is a risk that the connection portion of the wire rope may be damaged by the weight of the water when the traveling end of the tubular liner is lifted, and the winding work of the wire rope is also extremely difficult. It is hard work.

In particular, when the pipeline to be repaired is equal to or larger than the entrance of the manhole, not only the mouthpiece and the tubular liner obstruct the winding work of the wire rope, but also the wire rope cannot be pulled out to the ground. there were.

The present invention has been made in view of the above circumstances, and a purpose thereof is to smoothly and properly apply a large-diameter tubular liner to a pipe line connected from above a manhole to a lower portion thereof. So that it can be introduced.

[0011]

According to the present invention, in order to achieve the above object, one end of a tubular liner impregnated with a curable resin is connected to a cylindrical die set on a manhole, and the tubular liner is connected. After being introduced into the pipeline while being inverted by the fluid pressure, the hardening resin was cured while the tubular liner was pressed against the inner wall of the pipeline to form a hard coating by the tubular liner on the inner wall of the pipeline. In the pipeline repair method, the upper end of a flexible reversing guide formed in a vent shape such that the lower end faces the entrance of the pipeline in advance is connected to the base, and the lower end of the reversing guide is directed toward the entrance of the pipeline. An object of the present invention is to provide a method for reversing a tubular liner in a pipeline repair method, wherein the tubular liner is guided into a pipe through the reversing guide.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the flow of the pipeline repair method according to the present invention is shown in order in FIGS. In the figure, 1 is a manhole, 2 is a pipeline connected to the bottom thereof, such as a sewer, 3 is a tubular liner used for repairing the pipeline 2, and the tubular liner 3 is formed of a nonwoven fabric such as polyester or the like as is known. A flexible tubular resin absorbent material as a support, impregnated with a thermosetting resin such as epoxy resin or unsaturated polyester, and coated on both inside and outside with a plastic film such as polyethylene or polyurethane It is.

Before use, the tubular liner 3 is folded in a band shape and kept cool, and when used, is introduced into the pipe line 2 while being inverted by a fluid pressure as described later. One end in the longitudinal direction is opened as a connecting portion, and the other end is closed so that fluid does not leak.

On the other hand, reference numeral 4 denotes a cylindrical base to which one end of the open side of the tubular liner 3 is connected. The base 4 has substantially the same diameter as the tubular liner 3, and a flange 4A is integrally formed at the upper end thereof. It is formed. Reference numeral 5 denotes a flexible, bent-shaped reversing guide having a tubular shape that is approximately the same as or slightly longer than the depth of the manhole. The reversing guide 5 guides the tubular liner 3 in a predetermined direction, that is, from the ground to the pipe 2 buried in the ground through the manhole 1 and is made of a flexible tube made of polyethylene or the like. In particular, one end (lower end) is bent in an elbow shape. That is, the tubular liner 3 is connected to the manhole 1.
The pipe is bent into an elbow shape with a gentle curvature so that it can be smoothly guided into the pipeline 2 from the outside, but the degree is set according to the inner diameter of the manhole and the pipeline, and the connection angle between the manhole and the pipeline. You.

When the pipe 2 is repaired, first, as shown in FIG.
Through the upper end opening of the tubular liner 3
Is connected to the outer periphery of the lower part of the base 4 by turning one end of the base 4 outward. Further, the upper end of the reversing guide 5 is connected to the outer periphery of the lower part of the base 4 via the folded portion of the tubular liner 3. A ring-shaped tube clamp 6 is used to connect them, and this is fastened to the lower periphery of the base 4 on the periphery of the tubular liner 3 and the reversing guide 5. A packing is interposed between them to enhance the sealing property of the connection part.

Further, before and after the above-mentioned operation, the base 4 is set on the manhole 1 on the gantry 7 assembled therearound. Although the set only needs to put the flange 4A on the portion of the gantry 7, it is preferable to bolt the flange 4A and the portion of the gantry 7 together. Then, the reversing guide 5 whose upper end is connected to the base 4 is suspended in the manhole 1 and its lower end is exposed to the entrance of the pipeline 2 to be repaired. In the case where the clearance between the manhole 1 and the reversing guide 5 is large and the reversing guide 5 fluctuates, its lower end is preferably fixed to the bottom of the manhole 1 using an anchor bolt or a string. For this purpose, for example, a projection (not shown) is partially formed on the outer periphery of the lower end of the reversing guide 5.

When the lower end of the reversing guide 5 faces the entrance of the pipe 2, water is injected into the base 4 in that state. That is, water is injected as a fluid. Then, the tubular liner 3 whose one end is folded back and connected to the lower outer periphery thereof travels inside along the reversing guide 5 while being reversed under the water pressure, and hangs down from the ground into the manhole 1.

Of course, the water injection continues during the inversion of the tubular liner 3 and supplies a sufficient amount to smoothly invert the tubular liner 3. Therefore, the tubular liner 3 continues to extend downward along the reversing guide 5, and when its advancing end reaches the lower end of the reversing guide 5, the direction is changed at this portion. That is, as shown by the imaginary line in FIG. 1, the advancing end of the tubular liner 3 is directed to the inlet of the conduit 2 along the lower end of the reversing guide 5. Thereafter, the advancing end of the tubular liner 3 extends from the lower end of the reversing guide 5, is guided to the entrance of the conduit 2, and is introduced therein.

FIG. 2 shows this state. As can be seen in this figure, the tubular liner 3 is connected to the line 2 by the head pressure h.
Then, the inside of the pipe 2 is covered over its entire length as shown in FIG. Here, a warm water hose 8 is connected to the end of the tubular liner 3 in advance. Therefore, the warm water hose 8 is drawn into the inside of the tubular liner 3 by inversion of the tubular liner 3, and by the time the inversion of the tubular liner 3 is completed. As shown in FIG. 3, a series of pipes are laid along the inside of the tubular liner 3 in the pipe line 2.

Then, as shown in FIG. 3, a disc-shaped lid 9 is put on the upper end opening of the base 4 via a packing (not shown), and this lid 9 is fastened to the base 4A of the base by a vice. After that, compressed air is supplied from the compressor C through the lid 9 from the outside into the closed space S formed by the lid 9, the base 4, and the tubular liner 3. The lid 9 is previously suspended on the base 7 with a chain block or the like above the base 4, and after the entire tubular liner 3 is drawn into the base 4, it is gradually lowered onto the base 4A of the base. A pipe for supplying compressed air is connected to the lid 9, and a hot water hose 8 and a drain pipe 10 are passed through the lid 9. In particular, the hot water hose 8 is composed of a hard tube 8A penetrating the lid 9 and a flexible tube 8B connected to the lower end thereof.
Is movable in the length direction while being kept airtight through an O-ring or the like and penetrated. Therefore, the hot water hose 8 can smoothly supply hot water without lifting the flexible pipe 8B by pulling up the hard pipe 8A, and the drain pipe 10 sinks its lower end regardless of the amount of water in the tubular liner 3. Drainage can be performed reliably.

Here, when the compressed air is supplied to the closed space S, the tubular liner 3 introduced into the pipe 2 is pressed against the inner wall of the pipe 2 by the pressure of the compressed air and the head pressure.
Therefore, while the hot water heated by the boiler B is supplied into the closed space S through the hot water hose 8 by the pump P, the water stored in the closed space S is discharged from the drain pipe 10 to keep the pressure in the closed space S constant. The water temperature in the closed space S is increased. The boiler B includes a water storage tank and a heat source for heating the water stored in the water storage tank, as is well known. And
The hot water obtained by the boiler B is supplied into the tubular liner 3 from the hot water hose 8 by the pump P, and the stored water in the tubular liner 3 is returned to the boiler B to repeat the circulation of the hot water. While being pressed against the inner wall of the pipe 2, the thermosetting resin impregnated therein hardens, whereby a hard coating of the tubular liner 3 is formed on the inner wall of the pipe 2. Thus, when the tubular liner 3 is completely cured, the hot water is drained, the hot water hose 8 is taken out, and the tubular liner 3 is placed at the inlet side and the outlet side of the pipe 2.
Is to be cut.

The preferred example of the present invention has been described above.
The shape of the base and the method of connecting the tubular liner to the base are not limited to the above examples, and various known techniques can be adopted. FIG. 4 shows an example in which a base 4 having a flange 4A in the middle is used, and a tubular liner 3 is connected to the outer periphery of the upper end. Here, after connecting one end of the tubular liner 3 to the outer periphery of the upper end of the base 4, a part of the tubular liner 3 is pushed into the base 4 to form a pocket 3A that receives fluid pressure. Also, in this example, the upper end of the reversing guide 5 is connected to the outer periphery of the lower end of the base 4. This is passed through the inside of the base 4 from the lower side, and one end thereof is turned outward to be connected to the outer periphery of the upper end of the base 4. Then, the tubular liner 3 may be connected to the outer periphery of the upper end of the base 4.

As shown in FIG. 5, the base 4 is divided into an outer cylinder 41 and an inner cylinder 42 fitted to a lower part of the outer cylinder.
After connecting one end of the tubular liner 3 to the outer periphery of the lower end of the outer tube 41, the inner tube 42 is fitted into the lower end opening of the outer tube 41, and the tubular liner 3 3 may be pressed in to form the pocket 3 </ b> A, while the upper end of the reversing guide 5 may be connected to the outer periphery of the lower end of the inner cylinder 42.

Here, in any case, the tubular liner 3
Can be inverted by using only one or both of a liquid and a gas as a fluid. In addition, as long as the gas is used, the base 4 is naturally covered with a lid so that the gas does not leak. In the above example, a thermosetting resin is used as the curable resin, but a photocurable resin or the like may be used instead. In this case, hot water as a heat medium for curing the thermosetting resin, Instead of hot air, steam, or the like, a light source is introduced into the tubular liner 3.

On the other hand, the reversing guide 5 can be obtained, for example, by integrally molding a resin or rubber material, or by sewing two nonwoven fabrics cut in an elbow shape into a tubular shape. The reversing guide 5 can appropriately guide the tubular liner 3 into the pipe line 2 as described above, and also has a role of preventing burst of the tubular liner 3 due to fluid pressure.

[0026]

As is clear from the above description, according to the present invention, since the tubular liner is passed through the reversing guide and reversed, the risk of the tubular liner bursting due to the internal pressure at the time of reversing can be eliminated. Moreover, since the reversing guide is formed in a vent shape so that the lower end thereof faces the entrance of the pipeline, the traveling end of the tubular liner is not changed in direction by lifting the winch with a winch, etc. Guidance can be appropriately guided into pipes such as sewers, which greatly improves work efficiency. Further, since the reversing guide has flexibility, even when a large-diameter pipe is repaired, the reversing guide can be introduced into the manhole and the tubular liner can be reversed inside the manhole.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state in which a tubular liner and an inversion guide are connected to a base.

FIG. 2 is a schematic view showing a state in which a tubular liner is turned by a reversing guide.

FIG. 3 is a schematic view showing a state in which a tubular liner is introduced into a conduit.

FIG. 4 is a cross-sectional view showing a connection example of a base, a tubular liner, and a reversing guide.

FIG. 5 is a cross-sectional view showing another connection example of the base, the tubular liner, and the reversing guide.

FIG. 6 is a schematic view showing a conventional method (for small to medium diameter).

FIG. 7 is a schematic view showing a conventional method (for large diameter).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Pipeline 3 Tubular liner 4 Base 5 Inversion guide 8 Hot water hose 9 Lid

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 105: 08 B29L 23:00

Claims (1)

[Claims] 1. An end of a tubular liner impregnated with a curable resin is connected to a cylindrical die set on a manhole, and the tubular liner is introduced into a pipeline while being inverted by fluid pressure. In a pipe line repairing method in which the hardening resin is cured while the tubular liner is pressed against the inner wall of the pipe to form a hard coating by the tubular liner on the inner wall of the pipe, a lower end of the pipe is previously formed in the pipe. The upper end of a flexible reversing guide formed in a vent shape so as to face the inlet of the pipe is connected, and the tubular liner is guided into the pipe through the reversing guide with the lower end of the reversing guide facing the inlet of the pipe. A method of reversing a tubular liner in a pipeline repair method, characterized in that: