JP2001280081A - Fixing method for insertion pipe to existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing method for an insertion pipe to an existing pipe capable of preventing the buoyancy applied to the insertion pipe even when a back-filling material having specific gravity and capable of exerting high strength is used, preventing the insertion pipe from being collapsed by the injection pressure of the back-filling material, and having high strength after regeneration. SOLUTION: The insertion pipe 2 is arranged in the existing pipe 1, the back-filling material is filled in the gap between the insertion pipe 2 and the existing pipe 1, and the back-filling material is hardened in this fixing method for the insertion pipe 2 to the existing pipe 1. A weight 4 is inserted in the insertion pipe 2, and a downstream side end part is blocked by a water stop valve 5 with a siphon provided with an overflow port 521 at a position higher than the apex of the insertion pipe 2. Water is fed into the insertion pipe 2 from the other end part so that water flows out of the overflow port 521 of the water stop valve 5 with the siphon, and the back-filling material is filled in the gap between the insertion pipe 2 and the existing pipe 1 with the internal water pressure loaded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pipe for arranging an intubation in an existing pipe, filling a gap between the intubation pipe and the existing pipe with a backfill material, and curing the backfill material. The present invention relates to a method for fixing an intubation.

[0002]

2. Description of the Related Art Conventionally, existing pipes such as sewage pipes are often piped with fume pipes or the like. This causes water leakage. For this reason, as a method of rehabilitating an aging existing pipe, an insertion pipe made of a synthetic resin spiral pipe or the like is provided in the existing pipe, and a gap between the insertion pipe and the existing pipe is filled with a backing material such as mortar. A so-called SPR method for curing the backfill material is known.

[0003] In this SPR method, the diameter of the intubation pipe disposed in the existing pipe is selected depending on the degree of aging of the existing pipe, the amount of sewage, and the like. A relatively small diameter intubation is used. In this case, the gap between the intubation tube and the existing pipe is filled with a backfill material such as mortar, and the existing pipe is reinforced.

[0004] However, if the specific gravity of the mortar to be injected becomes large, buoyancy acts on the intubation due to the injection of the backfill material, and the intubation may rise. If the backfill injection pressure is high, the intubation may be crushed.

[0005] In view of this point, the present applicant has filed Japanese Patent Publication No.
As described in Japanese Patent No. 9941, a method of filling a backfill material in a gap between an intubation tube and a sheath tube in a state where a liquid such as water is stored in the intubation tube has been proposed. However, in the case of this method, the buoyancy of the intubation cannot be countered unless a backfill having a specific gravity of 1.0 or less is used only by storing water in the intubation. And the strength after rehabilitation is low.
In addition, if water is stored only in the intubation, the stored water becomes warm water due to the heat generated by the heat of mortar hardening, the intubation becomes soft, and the intubation may be crushed by the injection pressure of the backfill material.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and can prevent buoyancy acting on an intubation tube even if a backfill material having a high specific gravity and high strength can be used. An object of the present invention is to provide a method of fixing an intubation to an existing tube having high strength after rehabilitation without the intubation being crushed by the injection pressure of the backfill material.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided an existing pipe in which an inner pipe is provided in an existing pipe, a gap between the inner pipe and the existing pipe is filled with a backfill material, and the backfill material is cured. A method of fixing an intubation with respect to, wherein a weight is inserted into the intubation, and a downstream end of the intubation is provided with a siphon stopcock provided with an overflow port at a position higher than the top of the intubation. The intubation and the existing pipe are inserted under a state in which water flows down from the upstream end portion into the intubation and water flows down from the overflow port of the water stopcock with siphon while the internal water pressure is applied. This is a method for fixing an inserted tube to an existing tube in which a gap between the tube and a backfill material is filled.

[0008]

The method of fixing an intubation to an existing pipe according to the present invention is as follows.
A weight is placed in the intubation tube, and the downstream end thereof is closed with a siphon stopcock provided with a water overflow port at a position higher than the top of the intubation tube, and the upstream end in the intubation tube. Fill the gap between the inserted pipe and the existing pipe with backfill material under the condition that water is allowed to flow down from the end and the internal water pressure is applied while water is flowing down from the overflow port of the stopcock with siphon. By doing, even if high-strength mortar with high specific gravity is used as the backfill material, in addition to the weight and the weight of the filled water, the intubation was lifted upward from the top of the intubation tube Since the internal water pressure is only applied to the head of the water surface (corresponding to the height of the overflow port of the stopcock with siphon from the top of the intubation), the intubation does not rise. , The gap secured above can be filled with backfill material, The buckling pressure is increased due to the internal pressure of the head difference acting on the pipe, and the backfill material is cooled by water flowing down in the intubation to prevent the heat generation and soften the intubation. Since there is no backfill material, the intubation tube is not crushed by the injection pressure of the backfill material, and a backfill material having high specific gravity and high strength can be used, so that the strength after rehabilitation increases.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view illustrating an example of a method for fixing an intubation tube to an existing tube according to the present invention.

As shown in FIG. 1, in the method of fixing an intubation to an existing pipe, first, an existing pipe 1 such as an aged sewage pipe is made of synthetic resin from an upstream manhole 31 to a downstream manhole 32. Is provided. The outer diameter of the inner tube 2 is smaller than the inner diameter of the existing tube 1 by the margin for filling the backfill material.

As a method for disposing the inner tube 2 in the existing tube 1, a spiral tube forming band is supplied to a main-push type tube forming machine installed in the upstream manhole 31 to form a spiral tube. May be extruded toward the downstream manhole 32, or the spiral pipe forming strip may be supplied from the upstream manhole 31 using a self-propelled pipe-making machine while the upstream pipe in the existing pipe 1 is being supplied. A spiral pipe may be manufactured while moving from the side manhole 31 to the downstream side manhole, and a method used in the SPR method can be appropriately adopted.

Next, a weight 4 made of a chain or the like is inserted into the inner tube 2 along the longitudinal direction, and a downstream end of the downstream manhole 32 is closed with a water stopcock 5 with a siphon. A water stopcock 5 with a siphon includes a water stopcock main body 51 that expands in the end portion of the insertion tube 2 to stop water by press-fitting compressed air from a compressor 6, and a water stopcock body 2.
Has a siphon 52 provided with an overflow port 521 at a position higher than the top of the pipe.

A hose 71 for injecting a backfill material is inserted in the upper part of the gap between the existing tube 1 and the inner tube 2 along the longitudinal direction. The upstream end of the backfill injection hose 71 is connected to the backfill injection machine 7 via the upstream manhole 31, and the downstream end is guided into the downstream manhole 32 to be opened. ing.

Next, the sewage flowing from the upstream end to the top of the tube of the intubation 2 in a state where the water level rises upward from the upstream end is used to fill the siphon 52 with the overflow port height. And may be allowed to flow down. Water flows down from the overflow port 521 of the siphon 52 of the water stopcock 5 with a siphon. Accordingly, in addition to the weight of the weight 4 composed of a chain or the like inserted along the longitudinal direction and the weight of the filled water, the water level raised upward from the top of the intubation tube 2 It is in a state where the internal water pressure is applied only for minutes.

Next, the gap between the intubation tube 2 and the existing tube 1 in this state is filled with a backfill material from a backfill material injection tube 71 by a backfill material injection machine 7 and the backfill material. To cure. At this time, even if mortar or the like having a high specific gravity and high strength can be used as the backfill material, in addition to the weight 4 and the weight of the filled water, the pipe top of the Head difference h from the water surface to the water surface raised upward (the inner pipe 2 of the overflow port 521 of the siphon 52 of the water stopcock 5 with a siphon)
(Corresponding to the height from the top of the tube), the internal water pressure is applied, so that the intubation tube 2 does not rise, and the backing material can be filled in the gap secured above. At the same time, the internal water pressure acting only on the head difference acts on the intubation tube 2 to increase its buckling pressure, and the backfill material is cooled by the water flowing down in the intubation tube 2 to prevent its heat generation. The intubation 2 is not softened.
Is not crushed by the injection pressure of the backfill material, and because a backfill material that can express high strength and high specific gravity can be used,
Strength after rehabilitation increases.

[0016]

The present invention will be described below with reference to examples. An inner tube 2 having an inner diameter of 250 mm was inserted into an existing tube 1 made of a fume tube having a nominal diameter of 300 mm by SPR method. The buoyancy F acting on the intubation tube 2 when the backfill material is injected into the gap between the existing tube 1 and the intubation tube 2 can be calculated by the following equation (1).

F = V × ρ-Wv Equation (1) where F: buoyancy (N / m), V: volume of the intubation (m ³⁾
/ M), ρ: Specific gravity of backfill material (-), W: Weight of intubation (N / m), v: Weight of water in the intubation (N / m). Table 1 shows a calculation example when water is filled in the intubation tube.

[0018]

[Table 1]

As is clear from Table 1, when the specific gravity of the backfill material is 1.15 even if water is filled in the intubation, 4
It can be seen that unless a weight of 0.6 N / m or more is added to the intubation, the intubation will float.

In addition, the critical buckling pressure of the intubation tube may be buckled by the injection pressure of the backfill material when a thin, rigid, polyvinyl chloride spiral tube forming band is used. Therefore, the method of fixing the intubation to the existing pipe as described with reference to FIG. 1 was adopted. At this time, in order to prevent the intubation tube 2 from being lifted by buoyancy when the backfill material is injected, the intubation tube 2 is filled with sewage flowing therein, and the insufficient weight per m in the intubation tube 2 An iron chain of 40.6 N / m or more was inserted.

The intubation tube 2 is a spiral tube made by using a thin rigid polyvinyl chloride spiral tube-forming band, and has a buckling pressure of 0.05 MPa due to the injection pressure of the backfill material. One used. However, since the injection pressure of the backfill material made of ordinary mortar takes about 0.05 MPa, a head difference (h) of 1 m from the top of the intubation tube 2 is secured, and the internal pressure of 0.01 MPa in the intubation tube 2 is secured. Acted. Further, the water was overflowed so that water always flowed from the overflow port 521 of the siphon 52 of the water stopcock 5 with siphon.

As a result, the buckling pressure of the intubation tube 2 is 0.06M
Pa, and the intubation tube 2 was safe without buckling even when an injection pressure of the backfill material of 0.05 MPa was applied. In addition, the intubation was not lifted by the buoyancy. Further, since the inner tube 2 is filled with water and is in a flowing state, the heat generated when the backfill material made of mortar is hardened is cooled, and the inner tube 2 is not softened.

[0023]

The method for fixing an intubation to an existing tube according to the present invention is configured as described above, so that even if a backfill material having a high specific gravity and exhibiting high strength is used, the method works on the intubation. Buoyancy can be prevented, the intubation tube is not crushed by the injection pressure of the backfill material, and the strength after rehabilitation is strong.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating an example of a method for fixing an intubation tube to an existing tube according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing pipe 2 Intubation 4 Weight 5 Water stopcock with siphon 51 Main body of water stopcock 52 Siphon 71 Hose for filling back material 521 Overflow port

Claims (1)

[Claims] 1. A method of fixing an insertion tube to an existing tube, wherein an insertion tube is provided in the existing tube, a gap between the insertion tube and the existing tube is filled with a backfill material, and the backfill material is cured. hand,
A weight is placed in the intubation tube, and the downstream end thereof is closed with a siphon stopcock provided with a water overflow port at a position higher than the top of the intubation tube, and the upstream end in the intubation tube. Fill the gap between the inner tube and the existing pipe with backfill under the condition that water is allowed to flow down from the end and the internal water pressure is applied while water is flowing down from the overflow port of the stopcock with siphon. A method for fixing an intubation tube to an existing tube.