JP2001248781A - Installation pipe stop water stopping method in sewer rehabilitation method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reliably stop water at a connection between a lining main pipe for rehabilitating a sewer main pipe and a lining mounting pipe for rehabilitating the mounting pipe. A saddle portion (11) having a radius of curvature corresponding to the radius of curvature of a lining main pipe and a locking claw (121) at a lower end portion of an outer peripheral surface.
And a sheet-like connecting joint 1 made of polyolefin resin having a rising portion 12 insertable into the inside of the lining attachment tube L2, a horizontal tubular portion 21 and a vertical tubular portion 2
The sheet heater 4 is disposed on the vertical tubular portion 22 of the packer 2 and is transported to the pipe opening of the lining attachment pipe L2. Then
The pressurizing fluid F is press-fitted into the packer 2 to expand it, and the rising portion 12 of the connection joint 1 is inserted into the lining attachment tube L2. It is integrated with the inner peripheral surface of L2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stopping water from a lined installation pipe in a method of rehabilitating an aging sewer.

[0002]

2. Description of the Related Art As a method of rehabilitating a sewer main without cutting it, a method of inserting an uncured FRP tubular body into a pipe or a method of connecting a pipe made of thermoplastic oil to an existing sewer (main pipe).
A method of lining the existing pipe inner surface by inserting it into the inside of the pipe and attaching it to the inner surface of the pipe has been put to practical use.

[0003] Generally, most sewer mains are connected to a mounting pipe through which sewage flows from a rainwater basin, a sewage basin, or the like. Due to earth pressure, traffic load, etc., aging occurs and gaps are formed, often causing problems such as inflow of groundwater into sewerage and outflow of sewage into soil. In order to solve this problem, in the rehabilitation method by non-cutting, a saddle-shaped member made of FRP (fiber reinforced plastic) is hardened at the mounting port as a water stop treatment at the connection (mounting port) between the mounting pipe and the main pipe. The method of stopping the water in the pipe mouth by using the method is mainly employed (for example, see Japanese Patent Application Laid-Open No. H10-286878).

[0004]

However, since FRP uses an uncured thermosetting resin, an organic solvent is often used, and its flammability and flammability may cause safety problems in construction. There is. In addition, the unique odor of the organic solvent may harm the health of local residents.

[0005] The present invention has been made in view of such problems, and is excellent in safety, and is capable of stopping water at a connection portion between a lining main pipe for rehabilitating a sewer main pipe and a lining mounting pipe for rehabilitating the mounting pipe. It is an object of the present invention to provide a method for stopping water at an installation pipe in a sewer rehabilitation method that can be reliably performed.

[0006]

According to the present invention, a pipe made of a polyolefin resin is inserted into an aged sewer main pipe, attached to the inner surface of the main pipe, lined, and connected to an installation port of the sewer main pipe. In the sewer rehabilitation method of inserting a polyolefin resin pipe into the fitted pipe, attaching it to the inner surface of the fitted pipe and lining it, and rehabilitating the sewer main pipe and the fitted pipe, this is a method of stopping water at the lining fitting pipe mouth. A sheet made of a polyolefin resin having a rising portion which has a saddle portion having a radius of curvature corresponding to the radius of curvature of the inner peripheral surface of the lining main pipe and a locking claw formed at a lower end portion of the outer peripheral surface and which can be inserted into the lining mounting pipe. A connection heater, a heat-resistant and pressure-resistant packer composed of a horizontal tubular portion and a vertical tubular portion, and a seat heater arranged in the vertical tubular portion of the packer. After transporting from the inside of the lining main pipe to the position facing the lining mounting pipe opening, pressurizing fluid is pressed into the packer and the rising part of the connection joint is inserted into the lining mounting pipe, and then the sheet heater is energized. The rising portion is melted and pressed against the inner peripheral surface of the lining mounting pipe to stop the water at the lining mounting pipe opening.

[0007] In the present invention, the saddle portion of the connection joint is E
Preferably, an F mechanism is provided. Further, it is preferable that a waterproof rubber is disposed on the saddle portion of the connection joint.

According to the present invention, first, a sheet-like connection joint made of a polyolefin resin and having a saddle portion and a rising portion having a locking claw at the lower end of the outer peripheral surface is prepared. Here, the outer diameter of the upper end portion of the rising portion of the connection joint is formed to be slightly smaller than the inner diameter of the lining mounting pipe so that it can be easily inserted into the lining mounting pipe. Further, the outer diameter of the locking claw is formed to be slightly larger than the inner diameter of the lining mounting pipe. On the other hand, the saddle portion of the connection joint is formed to have a radius of curvature of the inner peripheral surface of the lining main pipe or a radius of curvature close thereto.

A heat-resistant and pressure-resistant packer comprising a horizontal tubular portion and a vertical tubular portion and having a seat heater disposed in the vertical tubular portion is attached to the above-mentioned connection joint. It is transported to a position facing the lining installation port by a mobile robot or cable wire. At this time, a hose for pressurizing a pressurizing fluid such as water or air from the outside of the tube into the packer is connected to the packer, and a cable for supplying a power supply voltage to the seat heater is connected to the packer.

Next, the pressurizing fluid is pressed into the packer to expand the packer, the rising portion of the connection joint is inserted into the lining attachment pipe, and the saddle portion is brought into close contact with the inner peripheral surface of the lining main pipe. When the rising portion of the connection joint is inserted into the lining attachment tube, the locking claw engages with the inner peripheral surface of the lining attachment tube, and the connection joint is temporarily fixed to the lining attachment tube to prevent the connection joint from falling off.

In the case where the lining mounting pipe opening is separated from the outer peripheral surface of the lining main pipe, the outer diameter of the locking claw is formed to be slightly larger than the diameter of the hole formed in the lining main pipe. For this reason, the engaging claw is engaged with the outer peripheral surface of the lining main pipe, and similarly, the connection joint is temporarily fixed and the falling off from the lining mounting pipe is prevented.

Thereafter, when the seat heater is energized, the upper end of the rising portion of the connection joint is melted and is pressed against the inner peripheral surface of the lining mounting pipe by the expanded packer, so that the rising portion of the connection joint is lined with the lining. It is integrated with the pipe and can shut off the lining attachment pipe mouth.

[0013] Here, the packer presses in the pressurizing fluid and heats and melts the upper end of the rising portion of the connection joint through a sheet heater. , Made of silicon rubber or heat-resistant rubber.

When the water stoppage at the connection between the lining main pipe and the lining mounting pipe is completed, the pressurizing fluid press-fitted into the packer is discharged, the packer is reduced, and the packer is pulled out of the pipe together with the sheet heater. Complete the construction.

In the present invention, if an EF mechanism using a heating wire is provided in the saddle portion of the connection joint, the saddle portion can be fused to the lining main pipe by supplying electricity to the EF mechanism. Therefore, even if a flow rate exceeding the set maximum flow rate of the sewer such as to reach the lining attachment pipe mouth is generated, the water can be reliably stopped between the saddle portion and the lining main pipe.

In the present invention, if the waterproof rubber is provided on the saddle portion of the connection joint, the saddle portion and the lining main pipe can be sealed. Therefore, even if a flow rate exceeding the set maximum flow rate of the sewer such as to reach the lining attachment pipe mouth is generated, the water can be reliably stopped between the saddle portion and the lining main pipe.

In this case, as the material of the water-stopping rubber, ordinary rubber can be used, but in order to further improve the water-stopping performance, use is made of a water-swellable rubber whose volume expands due to absorption of moisture. Is preferred.

[0018]

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

First, the connection joint 1 and the packer 2 (see FIG. 1) used in the embodiment of the present invention will be described.

The connection joint 1 is a sheet-shaped integrally formed product made of a polyolefin resin, for example, polyethylene.
As shown in FIGS. 2 (A) to 2 (C), a saddle portion 11 having a flat elliptical shape and a cylindrical rising portion 12 provided on the outer surface of the saddle portion 11 are provided.

The saddle portion 11 of the connection joint 1 is formed in a circular arc shape in vertical section, and its outer surface has a radius of curvature equal to or close to that of the inner surface of the lining main pipe L1 (see FIG. 1). Have been. In addition, saddle part 1
Although not shown in detail, 1 is provided with an EF (electrofusion) mechanism using a heating wire.

A plurality of locking claws 121 having a sawtooth cross section are formed over the outer peripheral surface at the lower end of the rising portion 12, and the outer diameter of the tip of the locking claw 121 is set to the lining mounting pipe L2. (See FIG. 1). The upper end of the rising portion 12 is formed in a thin shape, and the outer diameter thereof is set to be slightly smaller than the inner diameter of the lining mounting pipe L2.
Therefore, the upper end of the rising portion 12 can be easily inserted into the lining attachment pipe L2.

The packer 2 is a substantially T-shaped hollow member made of, for example, a heat-resistant and pressure-resistant flexible material such as silicon rubber, and as shown in FIG. A vertical cylindrical portion 22 continuing to the center of the cylindrical portion 21
Is formed from. A fluid inlet 2a is provided at one end of the horizontal tubular portion 21.
By connecting the hose 3 to a, the pressurizing fluid F can be press-fitted from outside the lining main pipe L1.

At the upper end of the vertical tubular portion 22 of the packer 2, a seat heater 4 is disposed so as to surround the periphery thereof. This seat heater 4 is, as described later,
The upper end of the rising portion 12 of the connection joint 1 is heated and melted. Since the packer 2 is inserted into the main lining L1 in a folded state, the packer 2 is expanded and the connection joint 1 is fixed. When set to the position,
It is appropriately positioned with a metal fitting or the like on the vertical tubular portion 22 so as to be located at a position corresponding to the upper end of the rising portion 12.

Next, an embodiment of a method for stopping water from a fitting pipe according to the present invention will be described with reference to FIG.

First, as a pre-process, after the lining main pipe L1 is adhered to the inner surface of the existing main pipe P1 to rehabilitate the existing main pipe P1, a hole is formed in the lining main pipe L1.
A hole is formed at a position corresponding to the mouth of the mounting tube P2. Next, the lining attachment pipe L2 is attached to the inner surface of the existing attachment pipe P2 to rehabilitate the existing attachment pipe P2.

The lining main pipe L1 and the lining mounting pipe L2 are made of a polyolefin resin, for example,
Polyethylene is used. The port of the lining attachment pipe L2 is formed by a hole L formed in the lining main pipe L1.
1a.

After the rehabilitation of the existing main pipe P1 and the existing mounting pipe P2 is completed, as shown in FIG.
The packer 2 is mounted on the connection joint 1 in a state where the seat heater 4 is arranged on the vertical tubular portion 22 of the packer 2, and the packer 2 is transported to the mouth of the lining main pipe P1 by a robot (not shown) or a cable wire.

A hose 3 for pressurizing the pressurizing fluid F from outside to inside is connected to the packer 2 and a cable (not shown) for supplying a power supply voltage from outside to the seat heater 4. ) Is connected.

Next, the pressurizing fluid F is pressed into the packer 2 through the hose 3 to expand the packer 2 (FIG. 1).
(B)). When the packer 2 expands, the connection joint 1 is pushed up, the rising portion 12 is inserted into the inside of the lining attachment pipe L2, and the saddle portion 11 is inserted.
Adheres to the inner peripheral surface of the lining main pipe L1. At this time, the connection joint 1 is temporarily fixed to the lining attachment tube L2 by the resistance of the locking claw 121 formed at the lower end of the rising portion 12, and is prevented from falling off from the lining attachment tube L2.

Next, by energizing the seat heater 4, the upper end of the rising portion 12 of the connection joint 11 is heated. When the rising portion 12 of the connection joint 1 is heated to a melting point or higher and melted, the expanded packer 2 is expanded.
As a result, the molten resin is pressed against the inner peripheral surface of the lining attachment tube L2 to be integrated (see FIG. 1C).

At the same time, when the EF mechanism is energized, the saddle portion 11 of the connection joint 1 is heated and melted, and the molten resin is pressed against the inner peripheral surface of the lining main pipe L1 by the expanded packer 2 to be integrated. . As a result, the connection between the lining main pipe L1 and the lining mounting pipe L2 can be stopped.

In the above-described embodiment, the case where the EF mechanism is provided on the saddle portion 11 of the connection joint 1 has been described, but a ring having an outer diameter larger than the outer diameter of the rising portion 12 is provided on the outer surface of the saddle portion 11. A water-stopping rubber 5 may be provided to seal the saddle portion 11 and the lining main pipe L2 (see FIG. 3). As the water-stop rubber 5, in order to further improve the water-stop performance, it is preferable to use a water-swellable rubber whose volume expands due to the absorption of moisture, but a normal rubber may be used.

Thereafter, after confirming that the connection joint 1 is solidified, the fluid press-fitted into the packer 2 is discharged to reduce the size of the packer 2, and the packer 2 is heated by the seat heater 4.
At the same time, the construction is completed.

FIG. 4 shows another embodiment of the method for stopping water from a fitting pipe according to the present invention.

In this embodiment, the end face of the lining attachment pipe L2 does not protrude into the hole L1a formed in the lining main pipe L1, and has a certain gap with the outer peripheral surface of the lining main pipe L1. It stops the water in case.

The connection joint 1 used in this embodiment is
As shown in FIG. 5, a plurality of locking claws 122 having an outer diameter slightly larger than the diameter of the hole L1a formed in the lining main pipe L1 are formed on the outer peripheral surface of the rising portion 12 at intervals in the circumferential direction. The rest is the same as the connection joint 1 described above.

For this reason, when the lining mounting port is stopped by using the connection joint 1 of this embodiment, the same operation as in the case of the above-described embodiment may be performed, and the detailed description is shown in FIG. Omitted.

In the case of the connection joint 1 of this embodiment,
The packer 2 is expanded so that the rising portion 12 of the connection joint 1 is expanded.
Into the lining mounting pipe L2,
Exceeds the outer peripheral surface of the lining main pipe L1.
2 engages with the outer peripheral surface of the lining main pipe L1, and the connection joint 1
To prevent falling off.

[0040]

As described above, according to the present invention, it is possible to reliably perform the water stopping process at the connection between the lining main pipe lining the sewer main pipe and the running mounting pipe lining the mounting pipe. Moreover, since the polyolefin resin is used for the connection joint, there is no problem such as flammability or flammability at the time of construction, and the connection joint is safe.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of a method for stopping water from a fitting pipe mouth of the present invention.

FIG. 2 is a front view, a side view, and a plan view of a connection joint used in the embodiment of FIG. 1;

FIG. 3 is an explanatory diagram in a case where water is stopped using a connection joint provided with a water stop rubber in a saddle portion.

FIG. 4 is an explanatory diagram of another embodiment of a method for stopping water from a fitting pipe according to the present invention.

FIG. 5 is a front view, a side view, and a plan view of a connection joint used in the embodiment of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection joint 11 Saddle part 12 Rising part 121,122 Locking claw 2 Packer 3 Hose 4 Seat heater 5 Waterproof rubber P1 Sewer main pipe P2 Mounting pipe L1 Lining main pipe L2 Lining mounting pipe F Pressurizing fluid

Claims (3)

[Claims] 1. A pipe made of a polyolefin resin is inserted into an aged sewer main pipe, attached to an inner surface of the main pipe and lined, and a polyolefin resin is attached to a mounting pipe connected to a mounting port of the sewer main pipe. In the sewer rehabilitation method of rehabilitating the sewer main pipe and the mounting pipe, the lining mounting pipe mouth is stopped, and the inner circumference of the lining main pipe is inserted. A sheet-shaped connection joint made of a polyolefin resin having a saddle portion having a curvature radius corresponding to the curvature radius of the surface and a rising portion formed with a locking claw at the lower end portion of the outer peripheral surface and capable of being inserted into the lining mounting pipe; A heat-resistant and pressure-resistant packer consisting of a vertical section and a vertical tubular section, and a sheet heater placed on the vertical tubular section of the packer to be placed inside the lining main pipe. After transporting to the position facing the lining fitting pipe opening, pressurizing fluid is pressed into the packer in this state and the rising part of the connection joint is inserted into the lining fitting pipe, and then the seat heater is energized to melt the rising part. A method of stopping water at a fitting pipe mouth in a sewer rehabilitation method, wherein the water is stopped at a lining fitting pipe mouth by being pressed against an inner peripheral surface of the lining fitting pipe. 2. The method according to claim 1, wherein an EF mechanism is provided at a saddle portion of the connection joint. 3. The method according to claim 1, wherein a water-stopping rubber is disposed at a saddle portion of the connection joint.