JPH08219365A - Existing pipeline repairing method and hose used therefor - Google Patents

Abstract

PURPOSE: To enable the easy formation of a uniform cement layer on the inner surface of an existing pipe of long distance by inserting a hose with protruding parts attached to the outer surface, into an existing pipeline, and filling cement milk in a clearance between the outer surface of the hose and the inner surface of the existing pipeline and hardening the cement milk. CONSTITUTION: A repairing hose 1 with protruding parts 12 attached to the outer surface of a hose 11 made of rubber or synthetic resin and foldable in the flat state is inserted in an existing pipeline 3. While applying pressure to the inside of the hose 1, cement milk 12 is filled in a clearance between the outer surface of the hose 1 and the inner surface of the existing pipeline 3 and hardened to form a cement layer 2 on the inner surface of the existing pipeline 3. It is desirable that the material of the protruding parts 12 is material containing cement such as concrete, cement paste or cement mortar. As a method of applying pressure to the inside of the hose 1, a method of feeding air or a fluid such as water into the hose 1 by a pump can be adopted. The uniform cement layer 2 can thereby be formed easily on the inner surface of an existing pipe 31 of long distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the repair of an existing pipeline,
In particular, for sewers, drainage lines, and other pipelines that have deteriorated and become brittle or have defects while still buried in the ground, a method for repairing existing pipelines by forming a new cement layer on the inner surface of the pipeline and It concerns the hose used for it.

[0002]

2. Description of the Related Art Conventionally, the following three methods have been known as methods for repairing existing pipelines such as sewers and drainage channels that have deteriorated and become brittle or have a defective portion while being buried in the ground. . A method disclosed in JP-B No. 54-1752 and JP-A No. 5-453, in which a synthetic resin tube is inserted while being inverted, and is adhered and / or cured on the inner surface of an existing tube wall. A method for continuously inserting a hard synthetic resin tape in a spiral shape at the entrance of an existing pipe disclosed in FIG. 8 of Japanese Patent Publication No. 6-73702 and inserting the pipe while molding the pipe. A method in which a flexible pipe or short pipe is inserted into an existing pipeline and cement milk is poured into the gap between the existing pipes. Both methods of and not only make the facility on the site of repairing the pipeline large-scale, but if the existing pipe has a large defect, the defect is only the synthetic resin pipe wall after the repair. Is present and the strength is not sufficient. In the case of the method of 1) and the method of adopting the short pipe, it is difficult to insert it over a long distance because it cannot correspond to the bent part of the existing pipe, and only the pipe diameter that can be inserted into the minimum diameter part of the existing pipe can be adopted for repair. After that, the flow rate decreases significantly. As a short tube suitable for the above method, a tube body having a convex shape or a convex band shape on the outer surface has been devised.
Although it is disclosed in Japanese Patent Laid-Open No. 163387, even if it is adopted, it is difficult to insert it over a long distance because it cannot correspond to the curved portion of the existing pipe, and a pipe that can be inserted into the minimum diameter portion of the existing pipe. The problem that only the diameter can be adopted and the flow rate is greatly reduced cannot be solved. If the flexible pipe is adopted by the method of (1), it can cope with the curved part of the existing pipe to some extent, but as the flexible pipe becomes longer or has a larger diameter, it becomes more difficult to transport and store, so the long-distance existing pipeline Can't be repaired.
And, similarly to the above, only a pipe diameter that can be inserted into the minimum diameter portion of the existing pipe can be adopted. As a result, a large deviation occurs between the center of the existing pipe and the center of the flexible pipe for repair, and there is a problem that a uniform cement layer cannot be formed even if cement milk is poured into the gap.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems at the same time. In other words, when repairing existing pipelines such as sewers, drainage channels, etc. that have deteriorated and become brittle or have defects in the underground, they can be installed on a small scale and easily installed over long distances. It is an object of the present invention to provide a method for forming a uniform cement layer on the inner surface of a pipe and an existing conduit hose suitable for the method.

[0004]

In order to solve the above-mentioned problems, the present invention has the following construction as a method for repairing an existing pipeline. Insert a repair hose with convex parts attached to the outer surface of a rubber or synthetic resin flatly foldable hose into the existing pipeline, and pressurize the inside of the hose to create a gap between the outer surface of the hose and the inner surface of the existing pipeline. Cement milk is poured into and cured to form a cement layer and a rubber or synthetic resin layer on the inner surface of the existing pipeline. Preferably, after curing, the hose is depressurized to form only the cement layer on the inner surface of the drawn existing pipeline. More preferably, only the hose is pulled out while leaving the convex part in the cement layer.

Next, according to the present invention, the hose used for repairing the above-mentioned existing pipeline has the following structure. A convex part formed of a material containing cement is attached to the outer surface of a flat foldable hose made of rubber or synthetic resin. Preferably, the short side surface of the convex part having the trapezoidal cross section is attached to the outer surface of the hose. More preferably, the convex part is attached to only one side of the hose when the flat part is folded.

The method for repairing the existing pipeline according to the present invention will be described in detail below. The hose for repairing the existing pipeline will be described in detail later and will not be described in detail here. FIG. 1 schematically shows a method of repairing an existing pipeline of the present invention as a cross-sectional view in the longitudinal direction of the existing pipeline in the order of (a) to (c). (A) is
Flat or collapsible hose 11 made of rubber or synthetic resin
It is the figure which inserted the hose 1 for repairing the existing pipeline which stuck the convex part 12 to the outer surface of the inside of the existing pipeline 3. Note that FIG. 3 is a sectional view taken along the line AA ′ of FIG. It is preferable that the hose for repairing the existing pipeline is inserted into the existing pipeline in a flatly folded state as shown in the figure, since it is possible to easily insert the hose over a long distance. The method of inserting is not particularly limited, and in the case of a long distance, for example, prior to insertion, a rope or the like is passed through an existing pipeline by a fluid such as air, water or a rod-shaped body having rigidity, With this rope, a method of pulling a hose for repairing the existing pipeline into the existing pipeline can be adopted.

FIG. 3B is a view showing that cement milk 21 is injected and cured in the gap between the outer surface of the hose 1 and the inner surface of the existing pipeline 3 while applying pressure inside the hose 1 for repairing the existing pipeline. The end of the hose needs to be sealed before the pressure is applied to the inside of the hose 1 for repairing the existing pipeline, but the method of sealing the end of the hose is not particularly limited. For example, in the present invention, since the flat hose made of rubber or synthetic resin is used, it can be easily sealed by using a pinchcock-like tool. As a method of applying pressure, a method of pumping a fluid such as air or water into a hose can be adopted. If air is used as the fluid, the equipment will be simple, and if water is used as the fluid, it is possible to use each of them such that the heat of hardening the cement milk is not taken away and the durability of the hose is not deteriorated. do not do. Further, a valve for feeding the fluid can be attached to the hose 1, and the hose may be directly connected to the pump. Furthermore, a meter for pressure control can be attached. Further, if the formwork 4 is installed as needed, the cement milk 21 can be completely pressed into the gap between the outer surface of the hose 1 and the inner surface of the existing pipeline 3.

(C) is after the cement milk has hardened,
It is the figure which decompressed the hose and pulled out only the hose 11. A new cement layer 2 is formed on the inner surface of the existing pipeline, and the repair of the existing pipeline is completed. It is possible to leave the hose 11 as it is and use it as a lining hose after the cement milk has hardened to form a cement layer. The hose 11 can be used not only for the pipeline repair method of the present invention, but also when the pipeline is used for a longer period of time and the pipeline needs to be repaired again. preferable. When the hose 11 is pulled out, when the convex component 12 is pulled out together with the hose 11 from the cement layer, holes are formed in the cement layer, which not only causes cracks but also reduces the strength of the formed cement layer. It is preferable to pull out only the hose 11 while leaving the convex component in the layer.

The cement milk of the present invention refers to a solution-like cement-mixed material such as cement paste or cement mortar, which is mixed with water, fine aggregate, admixture, water-reducing material, etc. in addition to the cement as the main ingredient. The type and composition of cement can be appropriately selected according to the material of the existing pipeline, etc., but it can be easily fed into narrow areas, the curing time is short, and the balance of strength and tenacity after curing is high. It is preferable that it is removed.

Next, the hose for repairing the existing pipeline will be described in detail. As the hose 1 used for repairing the existing pipeline described above, a hose 11 made of rubber or synthetic resin and capable of being flatly folded is provided with a convex component 12 attached to the outer surface thereof. The hose 11 functions as a mold for forming a cement layer, and the convex component functions to form the cement layer with a substantially uniform thickness. The hose 11 may be simply a tube of rubber or synthetic resin, but a hose having a fiber reinforced layer is preferable because it has higher pressure resistance and has a stable circular shape even under pressure. Regarding the material, rubber has higher wear resistance. However, in the case of a synthetic resin, for example, soft polyvinyl chloride, since it is easy to manufacture, it can be obtained at a low cost, and both can be appropriately selected.

The convex component 12 attached to the outer surface of the hose 11 will be described. First, regarding the material, various materials such as rubber and synthetic resin can be selected, but a material containing cement,
For example, what is molded with concrete, cement paste, cement mortar, etc. has good adhesion to the cement milk to be injected, and after the cement milk is cured, the hose 1
When 1 is pulled out, only the hose 11 can be easily pulled out, which is preferable. By using a shape with a trapezoidal cross section, if the short side of the cross section is attached to the outer surface of the hose 11, the convex component can be easily peeled off from the hose after the cement milk hardens, and only the hose 11 can be pulled out. It is preferable because it exists. A shape having a trapezoidal cross section means
For example, a truncated cone shape such as a truncated cone shape, a truncated triangular pyramid shape, or a truncated quadrangular pyramid shape as shown in A and B in FIG. 5, and a hypotenuse of the pyramid shape shown in FIG. 5C. Refers to a shape having.
In addition to these shapes, it is also possible to use a shape that partially provides a convex portion so that the hose 1 does not easily come off from the cement layer, but when the hose 1 is inserted into the existing pipeline, it is caught by the irregularities in the pipeline. It is not preferable because the projections 12 are likely to fall off easily.

Various adhesives can be used to attach the convex component to the hose, but it is preferable that the adhesive is easily attached and does not peel off when it is inserted into the existing pipeline, and easily peels off from the hose when depressurized. . The number, intervals, patterns, and sizes of the convex components to be attached can be appropriately selected according to the conditions such as the inner diameter of the existing pipeline and the curved portion. For example, when the interval between the convex parts is narrowed, the cement milk is attached to the staggered pattern so that the injection of the cement milk can be easily performed. If the hose is attached to only one side when folded, as shown in Fig. 2B and Fig. 4, when inserting the hose into the existing pipeline, make sure that the side without the convex parts is on the lower side. If inserted, the convex parts will not come off and the hose can be easily inserted. In this case, as shown in (b) and (c) of FIG. 2, if the cement milk is injected by applying pressure to the inside of the hose with air, the hose floats up due to buoyancy, so that a cement layer of a certain thickness is formed at the bottom of the hose. There is no problem.

[0013]

【Example】

Example 1 Assuming an aged existing pipe having a length of 5 m which is laid by a concrete pipe having an inner diameter of 230 mm under a railway line, a used concrete pipe is used as shown in FIG. A pipeline having a slight curved portion was installed, and the existing pipeline of the present invention was repaired using the hose for repairing the existing pipeline of the present invention.

Construction of Hose for Repairing Existing Pipeline As a flatly foldable hose, lay flat hose 200φ made of soft polyvinyl chloride manufactured by Kuraray Plastics Co., Ltd. was adopted. Then, in a flat state, two convex parts made of concrete were attached only to the upper surface of the hose at intervals of about 600 mm in the length direction of the hose using a bond G17 manufactured by Konishi. The shape of the convex part was the shape having a height of 10 mm shown in FIG. 5B, and the sticking surface was the upper surface of FIG. 5B, that is, the truncated pyramidal truncated surface.

Repair of existing pipeline A hose pulling rope was previously passed through the existing pipeline, and a hose for repairing the existing pipeline was inserted by this rope, but it could be inserted very easily. In addition, no protruding parts of the hose were found to have fallen off. After insertion, formwork is installed at both outlets of the existing pipeline, both ends of the hose are sealed with large clips, and an air inlet valve is attached to 1 kg /
Air was blown in to a pressure of cm ² . The actual diameter of the hose at this time was 207 mm. Next, cement paste using normal cement as cement milk was injected between the existing pipeline and the hose for repair by a grout pump, and finally pumped to a pressure of 1 kg / cm ² . At this time, the hose floated and the convex parts were attached only to the upper surface of the hose, but the space between the hose and the existing pipeline was about 10 mm at any part.
Met. After the cement milk layer was hardened, when the air pressure of the hose was released and the hose was pulled out, only the hose was pulled out and the convex parts remained in the cement layer. It was also possible to pull out the hose easily.

Finally, the repaired pipe was taken out and partially broken to observe the cross section, and it was confirmed that a uniform cement layer having a thickness of about 10 mm was formed. Further, at this time, the position of the convex component remaining in the cement layer was not fixed and destroyed.

Example 2 An aged existing pipe having a length of 10 m, which was laid by a concrete pipe having an inner diameter of 230 mm under a railway line, was actually repaired. The repair method and the hose used therefor were the same as in Example 1 except that the length was adapted to 10 m. As a result, it was easy to insert the repair hose into the existing pipeline, pump the cement milk, and pull out the hose after the cement milk hardened, even though the length was 10 m. Finally, the inside of the pipeline after repairing was observed, but no protruding parts were found to have fallen off, and they remained reliably in the cement layer.

[0018]

EFFECTS OF THE INVENTION According to the method for repairing an existing pipeline of the present invention and the hose used therefor, an existing pipeline such as a sewer or a drainage channel which is deteriorated and becomes brittle or has a defective portion while being buried in the ground is repaired. At this time, the equipment on site is small, and it is possible to easily form a uniform cement layer in a long-distance existing pipe.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the length of an existing pipeline showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view in the longitudinal direction of an existing pipeline showing another embodiment of the present invention.

3 is an actual cross-sectional view taken along the line A-A 'in FIG.

4 is a sectional view taken along line B-B ′ of FIG.

FIG. 5 is an aspect diagram of a convex part of a hose for repairing an existing pipeline.

[Explanation of symbols]

 1 Hose for repairing existing pipelines 11 Flatly foldable hose 12 Convex parts 2 Cement layer 21 Cement milk 3 Existing pipeline 31 Existing pipeline 4 Formwork

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenji Kamata Kenji Kamata, 241 Nanjo, Nanjo, Hanamaki-shi, Iwate Prefecture (72) Hiromichi Tachibana 6-8-10 Fukushima, Fukushima-ku, Osaka Kuraray Plastics Co., Ltd. (72) Hideki Murase, Inventor 6-8-10 Fukushima, Fukushima-ku, Osaka Kuraray Plastics Co., Ltd.

Claims (6)

[Claims] 1. A hose for repair, which is made of rubber or synthetic resin and can be flatly folded, and a convex part is attached to the outer surface of the hose, is inserted into an existing pipeline, and pressure is applied to the inside of the hose while the outer surface of the hose is exposed. A method of repairing an existing pipeline by injecting cement milk into the gap between the inside of the existing pipeline and hardening it to form a cement layer and a rubber or synthetic resin layer on the inside of the existing pipeline. 2. A hose made of rubber or synthetic resin, which can be flatly folded, and whose outer surface is provided with a convex component, is inserted into an existing pipeline for repair, and pressure is applied to the inside of the hose while the outer surface of the hose is exposed. A method of repairing an existing pipeline by injecting cement milk into the gap between the inside of the existing pipeline and hardening it, then depressurizing the hose and pulling it out to form a cement layer on the inside of the existing pipeline. 3. The method for repairing an existing pipeline according to claim 2, wherein after the cement layer is solidified, only the hose is pulled out while leaving the convex component in the cement layer. 4. A hose for repairing an existing pipeline, in which a convex part made of a material containing cement is attached to the outer surface of a flatly foldable hose made of rubber or synthetic resin. 5. The hose for repairing an existing pipeline according to claim 4, wherein the short side surface of the convex portion having the trapezoidal cross section is attached to the outer surface of the hose. 6. The hose for repairing an existing pipeline according to claim 4, wherein the convex component is attached to only one surface of the hose when the hose is folded.