JP2001124241A - Bypass pipe, and joining method of the bypass pipe with existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bypass pipe which can be surely and temporarily installed on an existing pipe in a short time, and easily withdrawn if necessary, and its execution method. SOLUTION: An outer pipe and an inner pipe are connected to each other by an expansion jack so that the overall length is expandable with the inner pipe inserted in the outer pipe, and a flanged receiving part which can be kept watertight to an outer surface of the existing pipe, or a bag-shaped seal which can be inflated in a watertight manner with the outer surface of the existing pipe by the fluid pressure is provided on the pipe end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for temporarily installing a bypass pipe in an existing pipe section which hinders a main construction work in an underground work.

[0002]

2. Description of the Related Art In underground construction, existing pipes such as water and sewage pipes hinder main construction, but this is particularly noticeable in urban areas. In this case, a bypass pipe is connected to the existing pipe before the main construction. Then, after temporarily securing a temporary flow path, the construction work was commenced.

[0003] In addition, although a bypass pipe that can be inserted into an existing pipe is used, cement mortar or epoxy resin is conventionally used as a joining material for joining the two in order to eliminate water leakage from a joint portion between the two. It had been.

[0004]

However, according to the above-mentioned conventional technique, it takes a long time to cure the joining material, and the internal pressure of the existing pipe is applied to the joining material during the curing. And it could not be done reliably. In addition, if it is necessary to switch to another bypass location, the cured bonding material cannot be easily removed, and despite the bypass work for temporary construction, many removal work is required There was a problem that labor and time were required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object thereof is to provide a temporary and reliable temporary installation in an existing pipe and to easily remove it when necessary. The purpose of the present invention is to provide a bypass pipe and a method for constructing the bypass pipe.

[0006]

In order to achieve the above-mentioned object, according to the present invention, while the inner tube is inserted into the outer tube, the two members are connected by a telescopic jack so that the entire length can be extended.
At the end of the pipe, a means of providing a flanged receiving portion capable of maintaining watertightness on the outer surface of the existing pipe was used.

According to a second aspect of the present invention, as another bypass pipe, the two pipes are connected to each other by a telescopic jack in a state where the inner pipe is inserted into the outer pipe so that the entire length of the pipe can be extended. A means was used to provide a bag-like seal that expands in a watertight manner with the outer surface of the tube. In the bypass pipe using the bag-shaped seal, the invention of claim 3 selectively employs a means of providing an elastic waterproof sheet or swellable sheet on the outer surface of the bag-shaped seal. Furthermore, in the invention of claim 4, tap water of a water pipe connected to the joint via a valve device such as a pressure reducing valve may be used as a means for pressurizing and expanding the bag-shaped seal.

According to the present invention, a method of joining a bypass pipe to an existing pipe is to extend a bypass pipe formed by inserting an inner pipe into an outer pipe so as to extend and contract, and insert a pipe end into the existing pipe by a predetermined length. A means was used in which the outer surfaces of the bypass pipe and the existing pipe were joined in a water-tight manner by a receiving part with a flange.

According to another aspect of the present invention, a bypass pipe formed by inserting an inner pipe into an outer pipe so as to extend and contract is extended, and a pipe end thereof is inserted into an existing pipe by a predetermined length. A means was used in which a bag-shaped seal was provided in the annular gap between the pipe and the existing pipe, and the bag-shaped seal was expanded by filling the bag-shaped seal with a fluid to seal the annular gap watertight.

The fluid material to be filled in the bag-shaped seal attached to the pipe end of the bypass pipe is not only gas such as air, liquid such as water, but also powder or granular material such as sand or slurry. In the present invention, the material is not limited. That is, the requirements of the present invention are satisfied as long as a material which can be easily prepared on site is appropriately selected and the end of the bypass pipe and the existing pipe can be securely joined by expansion of the bag-shaped seal.

[0011]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a first embodiment of a bypass pipe B according to the present invention.
Is inserted into the outer tube 2 so as to be expandable and contractible, and a receiving end 4 with a flange for sealing the existing tube P from the outside is provided integrally at the tube ends 3. In addition, inner pipe 1
And the outer tube 2 are provided with telescopic jacks 5.
The telescopic jacks 5... 5 are detachably mounted and driven to expand and contract the inner pipe 1 and the outer pipe 2 so that the entire length of the bypass pipe can be adjusted. In addition, it goes without saying that the watertightness is maintained at the insertion position of the inner tube 1 and the outer tube 2. Also,
The telescopic jack 5 may be mounted inside the pipe.

FIG. 2 shows a second embodiment of the bypass pipe B. The same as in the first embodiment described above, the inner pipe 1 and the outer pipe 2 can be expanded and contracted by a telescopic jack 5 mounted on the outside. It is. The feature of the second embodiment is that a bag-shaped seal 6 is attached to the pipe ends 3.3 as joining members.
The bag-shaped seal 6 has a donut shape so as to seal the annular gap between the bypass pipe B and the existing pipe P in a water-tight manner, and can be expanded by filling with a fluid such as gas or liquid. In this bypass pipe B, the inner pipe 1 and the outer pipe 2
Expands and contracts while maintaining watertightness.

Next, a method of joining the bypass pipe B to the existing pipe P using the flanged receiving portion 4 will be described with reference to FIG. In this method, first, the bypass pipe B in a state where the inner pipe 1 and the outer pipe 2 are contracted is installed at the bypass location, and then the extensible jack 5 is driven so that the bent portion of the flanged receiving portion 4 becomes the existing pipe P. Extend the bypass pipe B until it comes into contact with the pipe end. Then, by performing an appropriate water stopping process on the tip of the receiving portion 4 with the flange, the joining is completed. According to this method, since the bypass pipe B and the existing pipe P are stopped from the outer periphery by the flanged receiving portion 4, the diameters of the bypass pipe B and the existing pipe P are different, and there is an annular gap between the two. Even so, the water can be completely stopped.
However, as in this embodiment shown in FIG. 3, by matching the inner diameter of the inner pipe with the inner diameter of the existing pipe, and the inner diameter of the outer pipe and the inner diameter of the existing pipe, the joining of the bypass pipe and the existing pipe is completed after the joining is completed. Since the inner circumference is continuous in a flush state without a step, there is no problem such as turbulence and the bypass can be performed without obstructing the main flow of the existing pipe, which is preferable. On the other hand, when the telescopic jack 5 is mounted inside the pipe, it can be removed and removed when joining is completed so as not to obstruct the main flow.

Next, a joining method of the bypass pipe B using the bag-shaped seal 6 will be described with reference to FIG. Even with this construction method,
The bypass pipe B is installed at the bypass location in a contracted state, and then extended by the telescopic jack 5 to insert the pipe end of the bypass pipe B into the existing pipe P to a predetermined depth. At this time, the bag-shaped seal 6 is set in a deflated state without internal pressure (FIG. 4).
(A)). Next, the bag-shaped seal 6 is filled with gas, liquid, or the like,
By expanding the bag-shaped seal 6, the gap between the bypass pipe B and the existing pipe P is stopped, and the joining of both is completed (FIG. 4).
(B)).

The existing pipe P may have irregularities on its inner surface with the passage of time. In this case, the outer surface of the expanded bag-shaped seal 6 does not adhere to the inner surface of the existing pipe P, May not be able to stop the water. Therefore, as shown in FIG. 5, an elastic waterproof sheet 7 may be provided on the outer surface of the bag-shaped seal 6 in advance. The waterproof sheet 7 absorbs the internal irregularities of the existing pipe P, so that the junction with the bypass pipe B can be completely stopped. However, a water expansion seal can be provided instead of the waterproof sheet 7.

The fluid to be filled in the bag-shaped seal 6 is not particularly limited. As a simpler method, tap water can be used as shown in FIG. Tap water is
This is because it is easily available at any site and the pressure control is easy by interposing a conventionally well-known valve such as the water pressure reducing device 8.

[0017]

As described above, according to the present invention,
By extending the bypass pipe, predetermined water stoppage treatment is performed for the flanged receiving portion, and for the bag-shaped seal, only the bag-shaped seal is expanded, and the joining to the existing pipe is completed. Construction can be performed in a very short time and reliably. In addition, since the present invention does not use any bonding material such as cement mortar or the like in connection with switching to another place, the present invention does not use any cement mortar or the like. It can be performed in a short time, and it has become possible to shorten the construction period and reduce the construction cost particularly in urban areas required in urban areas.

Further, even in the case of joining to an existing pipe P whose inner surface has irregularities with the passage of time, a sheet capable of absorbing the irregularities is provided outside the bag-shaped seal, so that water can be reliably stopped. it can. Further, since tap water is used as the expansion fluid of the bag-shaped seal, the present invention can be easily carried out at any site.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a bypass pipe according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the bypass pipe.

FIG. 3 is a process explanatory view showing a joining method using a bypass pipe of the first embodiment.

FIG. 4 is a process explanatory view showing a joining method using a bypass pipe according to a second embodiment.

FIG. 5 is an explanatory view showing a modified example of the bypass pipe of the second embodiment.

FIG. 6 is an explanatory view showing a further modified example of the bypass pipe of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner pipe 2 Outer pipe 3 Pipe end 4 Flanged receiving part 5 Telescopic jack 6 Bag-shaped seal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoto Kobayashi 945-25 Nagasago, Noguchi-cho, Kakogawa City, Hyogo Prefecture

Claims (6)

[Claims] 1. An inner tube is inserted into an outer tube, and the two are connected by a telescopic jack so that the entire length can be extended. At the end of the tube, a receiving portion with a flange capable of maintaining watertightness is provided on the outer surface of the existing tube. A bypass pipe characterized in that: 2. A bag which is connected to the outer tube with an extendable jack so that the entire length can be extended while the inner tube is inserted into the outer tube, and the tube end expands in a watertight manner with the outer surface of the existing tube by pressurizing fluid. A bypass pipe characterized by having a shape seal. 3. The bypass pipe according to claim 2, wherein an elastic waterproof sheet or swellable sheet is provided on the outer surface of the bag-shaped seal. 4. The bag-shaped seal is connected to a water pipe via a valve device, and is pressurized and expanded by the tap water.
The bypass pipe as described. 5. A bypass pipe formed by inserting an inner pipe into an outer pipe so as to be extendable and retractable, inserting a pipe end into the existing pipe by a predetermined length, and connecting the outer surfaces of the bypass pipe and the existing pipe with a flanged receiving portion. A method of joining bypass pipes to existing pipes, which is characterized by watertight joining. 6. A bypass pipe formed by inserting an inner pipe into an outer pipe so as to be extendable and retractable, and inserting the end of the bypass pipe into a predetermined length of the existing pipe, and forming a bag-like shape in an annular gap between the bypass pipe and the existing pipe. A method of joining a bypass pipe to an existing pipe, wherein a seal is provided, and the bag-shaped seal is filled with a fluid to expand the bag-shaped seal to seal the annular gap in a water-tight manner.