JP7602784B2 - Obstruction method using an obturator - Google Patents

Description

The present invention relates to a closing method using a closing device for closing an opening of a gap between a fluid pipe and a rehabilitation pipe when lining the inner wall of an existing deteriorated fluid pipe with a rehabilitation pipe.

Patent Document 1 discloses a sewer pipe rehabilitation method in which a synthetic resin rehabilitation pipe is lined on the inner wall of an existing deteriorated sewer pipe. In this method, a rehabilitation pipe is first inserted into the sewer pipe, and the rehabilitation pipe is lined in close contact with the inner wall of the sewer pipe.

Next, the area of the branch pipe connected to the sewer pipe near the junction with the sewer pipe is sealed, and a small hole is drilled from inside the sewer pipe at the location in the rehabilitated pipe that corresponds to the junction, and grout material is pressed in through the small hole and seeps into the gap between the inner wall surface of the sewer pipe and the outer wall surface of the rehabilitated pipe.

After a specified time has passed and the grout material has hardened, the seal plug is removed and the area corresponding to the junction is opened from the branch pipe side, connecting the branch pipe to the rehabilitated pipe.

JP 2002-52612 A

The above-mentioned sewer pipe rehabilitation method requires sealing the branch pipes for a long period of time until the grout material hardens to prevent the sewage in the branch pipes from flowing down into the sewer pipes, which creates the problem of imposing discharge restrictions on sewer users for long periods of time.

Therefore, a technical problem arises that must be solved in order to provide a blocking method that can carry out a rehabilitation construction method of constructing a rehabilitation pipe on the inner wall of an existing, deteriorated fluid pipe without imposing restrictions on the use of branch pipes, and the present invention aims to solve this problem.

In order to achieve the above-mentioned object, the blocking method of the present invention is a blocking method for blocking an opening of a gap between a fluid pipe and a rehabilitated pipe by using a blocking device that can be inserted into a junction port of a branch pipe that merges into a fluid pipe and a communication port that is drilled in a rehabilitated pipe constructed within the fluid pipe corresponding to the junction port, the blocking device comprising: a cylindrical base material having a drainage channel formed therein that can connect the branch pipe and the rehabilitated pipe; an airbag that is provided around the cylindrical base material and can be inflated and contracted; an over-inflation restriction sheet that is exteriorly attached to the airbag and restricts over-inflation of the airbag; and a protective sheet that is provided on the outer surface of the over-inflation restriction sheet and can block the opening of the gap between the fluid pipe and the rehabilitated pipe, and when the airbag is inflated, the cylindrical base material supports the airbag from the inside without elastically deforming, and the blocking method includes the steps of: arranging the blocking device at the communication port and the junction port from the rehabilitated pipe side; and inflating the airbag so that the protective sheet blocks the opening of the gap between the fluid pipe and the rehabilitated pipe.

With this configuration, the blocking device is placed at the junction and communication ports from the rehabilitated pipe side, the airbag inflates and the protective sheet closes the opening of the gap between the fluid pipe and the rehabilitated pipe, and the rehabilitated pipe and branch pipe are connected via a drainage channel, so that even when a rehabilitated pipe is constructed, the fluid flowing down the branch pipe can be drained into the rehabilitated pipe, and the filler filled in the gap between the fluid pipe and the rehabilitated pipe can be prevented from flowing into the rehabilitated pipe or branch pipe, and the fluid flowing down the rehabilitated pipe or branch pipe can be prevented from mixing with the filler.

According to the present invention, a method for rehabilitating fluid pipes can be carried out without imposing restrictions on the use of branch pipes.

1 is a vertical cross-sectional view showing a state in which a sewer pipe has been rehabilitated by applying a blocking device according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of FIG. 1 . FIG. 1 is a perspective view of an occlusion device. FIG. 4 is a longitudinal cross-sectional view of the occlusion device shown in FIG. 3.

The following describes an obstruction device 1 according to one embodiment of the present invention with reference to the drawings. Note that in the following, when referring to the number, numerical value, amount, range, etc. of components, unless otherwise specified or in principle clearly limited to a specific number, the number is not limited to that specific number, and may be more or less than the specific number.

In addition, when referring to the shape or positional relationship of components, etc., this includes things that are substantially similar or similar to that shape, etc., unless otherwise specified or considered in principle to be clearly different.

In addition, drawings may exaggerate characteristic parts to make the features easier to understand, and the dimensional ratios of components may not be the same as in reality. In addition, in cross-sectional views, hatching of some components may be omitted to make the cross-sectional structure of the components easier to understand.

As shown in Figures 1 and 2, the blocking device 1 is used in a rehabilitation method for constructing a rehabilitation pipe B on the inner wall of an old sewer pipe A, which is an existing fluid pipe.

The rehabilitation pipe B is constructed inside the sewer pipe A by combining multiple divisible segments. The gap between the sewer pipe A and the rehabilitation pipe B is filled with a filler C such as epoxy resin, mortar, or grout material.

Before the filler C is poured into the gap between the sewer pipe A and the rehabilitated pipe B, the blocking device 1 is inserted into the connection port F drilled corresponding to the junction port E of the branch pipe D that joins the sewer pipe A and the junction port E of the rehabilitated pipe B, and blocks the opening of the gap between the sewer pipe A and the rehabilitated pipe B. The configuration of the blocking device 1 is described below.

As shown in Figures 3 and 4, the closure device 1 includes a cylindrical base material 2, an airbag 3, an over-inflation restriction sheet 4, and a protective sheet 5.

The cylindrical base material 2 is formed in a generally cylindrical shape, has a smaller diameter than the branch pipe D, and extends longer than the gap between the sewer pipe A and the rehabilitation pipe B. The cylindrical base material 2 is made of a material such as metal, concrete, polyvinyl chloride, polyethylene, or polyolefin. The cylindrical base material 2 has a rigidity sufficient to support the inflation of the airbag 3 from the inside, which will be described later.

The cylindrical base material 2 has an inlet 21 at one end and an outlet 22 at the other end. A drainage channel 23 is provided inside the cylindrical base material 2 and connects the inlet 21 and the outlet 22, allowing sewage flowing down the branch pipe D to pass through. The cylindrical base material 2 also has a communication hole 24 that connects the inside and outside. Reference numeral 25 denotes a crimping ring made of stainless steel or the like that is attached to both ends of the outer periphery of the cylindrical base material 2.

The airbag 3 is formed in a roughly cylindrical shape and is made of an airtight and flexible sheet such as rubber. The airbag 3 is integrated with the cylindrical base material 2 by bonding the inner peripheral surface to the outer peripheral surface of the cylindrical base material 2. The length of the airbag 3 can be changed as appropriate, but is preferably set to be longer than the gap between the sewer pipe A and the rehabilitation pipe B.

The airbag 3 is equipped with an air hose 31 that passes through the communication hole 24. The air hose 31 extends from the outlet 22 toward the outside and is connected to an air pump (not shown) that can supply compressed air to the inside of the airbag 3. This allows the airbag 3 to be freely inflated and deflated by the inflow and outflow of compressed air.

The over-inflation limiting sheet 4 is made of a fabric that has high tensile strength and a high coefficient of friction, low water permeability, and is flexible. The over-inflation limiting sheet 4 is formed in a generally cylindrical shape that is larger than the airbag 3, and is attached to the tubular base material 2 so as to house and cover the airbag 3 inside. Both ends of the over-inflation limiting sheet 4 are crimped to the tubular base material 2 by exterior crimping rings 25.

The outer peripheral surface of the airbag 3 and the inner peripheral surface of the over-inflation restriction sheet 4 may be detachably attached via double-sided tape (not shown). This integrates the airbag 3 and the over-inflation restriction sheet 4, and the over-inflation restriction sheet 4 follows the expansion and contraction of the airbag 3. In addition, after releasing the pressure applied by the crimping ring 25, the over-inflation restriction sheet 4 can be peeled off from the airbag 3, allowing the over-inflation restriction sheet 4 to be removed from the cylindrical base material 2.

The protective sheet 5 is attached to the over-expansion regulating sheet 4 and is made of synthetic rubber such as chloroprene rubber that has elasticity in the thickness direction. The protective sheet 5 is detachably attached to the over-expansion regulating sheet 4 via double-sided tape (not shown). The protective sheet 5 is provided so as to cover almost the entire surface of the over-expansion regulating sheet 4 except for a portion of the over-expansion regulating sheet 4 (the other end side). The length dimension of the protective sheet 5 is formed to be longer than the gap between the sewer pipe A and the rehabilitation pipe B.

Next, the procedure for blocking the junction port E and the communication port F using the blocking device 1 will be explained with reference to Figures 1 and 2, along with the method for rehabilitating the sewer pipe A with the rehabilitation pipe B.

First, a rehabilitated pipe B is constructed by combining multiple segments inside sewer pipe A. At this time, a specified gap is ensured between sewer pipe A and rehabilitated pipe B. In addition, a communication port F is drilled in rehabilitated pipe B at a position corresponding to the junction port E of branch pipe D. The diameter of sewer pipe A is, for example, 800 mm or more, and the diameter of branch pipe D is, for example, about 100 to 200 mm.

Next, a worker places the blocking device 1 into the junction port E and the communication port F from the rehabilitation pipe B side. At this time, one end of the blocking device 1 is inserted into the branch pipe D, and the other end of the blocking device 1 is placed in the rehabilitation pipe B. In other words, the blocking device 1 is placed into the junction port E and the communication port F so that it can be inserted into the junction port E and the communication port F without elastically deforming the cylindrical base material 2.

Next, compressed air is supplied from the air pump to the airbag 3. The airbag 3 gradually expands radially outward from the closure device 1, but the over-inflation restriction sheet 4 provided on the outer periphery of the airbag 3 restricts excessive expansion of the airbag 3, maintaining its inflated shape and protecting the airbag 3 from damage or bursting.

When the airbag 3 is inflated, the protective sheet 5 adheres to the junction port E and the communication port F, blocking the opening of the gap between the sewer pipe A and the rehabilitated pipe B. The rehabilitated pipe B and the branch pipe D are also connected via the drainage channel 23 of the cylindrical base material 2, and the sewage flowing down the branch pipe D can be drained into the rehabilitated pipe B.

In addition, because the single airbag 3 inflates to straddle the junction port E and the communication port F, the junction port E and the communication port F can be blocked with a simpler configuration than, for example, blocking the junction port E and the communication port F with separate airbags.

In addition, the cylindrical base material 2 supports the airbag 3 from the inside, which inflates while maintaining a generally cylindrical shape with almost no elastic deformation when the airbag 3 inflates. This allows the airbag 3 to inflate stably and reliably seal the opening of the gap between the sewer pipe A and the rehabilitation pipe B, compared to when the cylindrical base material 2 is flexible and there is a risk that the cylindrical base material 2 will bend and change shape.

Next, filler C is poured into the gap between sewer pipe A and rehabilitated pipe B. Protective sheet 5 prevents filler C from flowing out of the gap between sewer pipe A and rehabilitated pipe B into rehabilitated pipe B or branch pipe D, and prevents sewage flowing down rehabilitated pipe B or branch pipe D from mixing with filler C.

When the filling material C is filled into the gap between the sewer pipe A and the rehabilitated pipe B and hardens, the compressed air in the airbag 3 is discharged to deflate the airbag 3. When the blocking device 1 is removed from the junction port E and the communication port F, the sewer pipe A and the rehabilitated pipe B are integrated with the junction port E and the communication port F secured, and the sewer pipe A can be reinforced against earthquakes.

In this way, the blocking device 1 according to this embodiment is a blocking device 1 that can be inserted into the junction E of the branch pipe D and the communication port F of the rehabilitated pipe B, and is configured to include a cylindrical base material 2 having a drainage channel 23 formed therein that can connect the branch pipe D and the rehabilitated pipe B, an airbag 3 that is provided around the cylindrical base material 2 and can be inflated and deflated, an over-inflation restriction sheet 4 that is attached to the airbag 3 and restricts over-inflation of the airbag 3, and a protective sheet 5 that is provided on the outer surface of the over-inflation restriction sheet 4 and can block the opening of the gap between the sewer pipe A and the rehabilitated pipe B.

With this configuration, the airbag 3 inflates and the protective sheet 5 closes the opening of the gap between the sewer pipe A and the rehabilitated pipe B, and the rehabilitated pipe B and the branch pipe D are connected via the drainage channel 23. This allows the sewage flowing down the branch pipe D to be drained into the rehabilitated pipe B even when the rehabilitated pipe B is constructed, and prevents the filler C filled in the gap between the sewer pipe A and the rehabilitated pipe B from flowing into the rehabilitated pipe B or the branch pipe D, or prevents the sewage flowing down the rehabilitated pipe B or the branch pipe D from mixing with the filler C.

The method for blocking the opening of the gap between the sewer pipe A and the rehabilitated pipe B using the blocking device 1 according to this embodiment includes the steps of placing the blocking device 1 at the communication port F and the merging port E from the rehabilitated pipe B side, and inflating the airbag 3 so that the protective sheet 5 blocks the opening of the gap between the sewer pipe A and the rehabilitated pipe B.

According to this configuration, the blocking device 1 is placed at the junction port E and the communication port F from the rehabilitated pipe B side, the airbag 3 is inflated and the protective sheet 5 closes the opening of the gap between the sewer pipe A and the rehabilitated pipe B, and the rehabilitated pipe B and the branch pipe D are connected via the drainage channel 23. This makes it possible to drain the sewage flowing down the branch pipe D into the rehabilitated pipe B even when the rehabilitated pipe B is constructed, and prevents the filler C filled in the gap between the sewer pipe A and the rehabilitated pipe B from flowing into the rehabilitated pipe B or the branch pipe D, and prevents the sewage flowing down the rehabilitated pipe B or the branch pipe D from mixing with the filler C.

Furthermore, in addition to the above description, the present invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that the present invention extends to such modifications.

The fluid flowing through the fluid pipe is not limited to the sewage mentioned above, but may be tap water, etc.

1: Closure device 2: Cylindrical base material 21: Inlet 22: Outlet 23: Drainage channel 24: Communication hole 25: Crimping ring 3: Air bag 31: Air hose 4: Over-inflation prevention sheet 5: Protective sheet

Claims (1)

A method for blocking an opening of a gap between a fluid pipe and a rehabilitation pipe by using a blocking device that can be inserted into a junction opening of a branch pipe that joins a fluid pipe and a communication opening that is drilled in a rehabilitation pipe constructed in the fluid pipe in correspondence with the junction opening, the method comprising:
The occlusion device comprises:
A cylindrical base material having a drainage channel formed therein that can connect the branch pipe and the rehabilitation pipe;
an airbag provided around the cylindrical base material and capable of expanding and contracting;
an over-inflation restriction sheet that is attached to the exterior of the airbag and restricts over-inflation of the airbag;
a protective sheet provided on an outer peripheral surface of the over-expansion restricting sheet and capable of closing an opening of a gap between the fluid pipe and the rehabilitation pipe;
Equipped with
When the airbag inflates, the cylindrical base material supports the airbag from the inside without elastically deforming,
arranging the blocking device at the communication port and the junction port from the rehabilitation pipe side;
inflating the airbag so that the protective sheet closes the opening of the gap between the fluid pipe and the rehabilitation pipe;
A method of obstruction comprising:

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