JPH0660706B2 - Rehabilitation method and equipment for old pipes in underground pipes - Google Patents

Description

Detailed Description of the Invention a. OBJECT OF THE INVENTION [Industrial field of application] The present invention relates to an existing pipe buried in the ground, in which, when the existing pipe is deteriorated, a rehabilitation pipe is arranged in the existing pipe to rehabilitate the existing pipe. Regarding the aging pipe rehabilitation method, specifically, filling the gap between the aging part of the sewer pipe connected to the rainwater basin on the ground by the mounting pipe and the retreading pipe inserted into the aging part with a backfill material, The present invention relates to a method and an apparatus for forming a communication hole in a rehabilitation pipe with a mounting pipe.

[Conventional technology]

As a technique for perforating an existing pipe and a rehabilitating pipe through a mounting pipe in a method of rehabilitating an aged pipe of this kind, JP-A-63-2
No. 32905 is known.

However, the known technique is effective when there is no gap between the existing pipe and the rehabilitation pipe, and is unsuitable when there is a gap between both pipes. That is, when there is a gap between the existing pipe and the rehabilitating pipe, the filler as the backfill material is filled in this gap, but this backfill filler penetrates into the mouth of the mounting pipe, This imposes a heavy burden on the cutter portion of the punching device inserted from the mounting tube, which hinders the punching work.

The presence of the gap between the existing pipe and the rehabilitating pipe is rather normal from the viewpoint of facilitating the insertion of the rehabilitating pipe. A lid is applied to the mouth of the mounting pipe before it is filled with a backfill filler, and after the backfill filler is solidified, the lid / filler and the rehabilitation pipe are cut and perforated. This is troublesome in terms of equipment and construction efficiency.

[Problems to be solved by the invention]

In view of the above situation, the present invention is a method for rehabilitating an aged pipe in which a rehabilitating pipe is inserted and installed with a gap in an existing pipe, and prevents the backfilling filler from entering the mounting pipe by a simple method.
An object of the present invention is to provide a construction method and a device used for the construction method that can easily form a communication hole in a mounting pipe of a rehabilitation pipe.

B. Configuration of the Invention [Means for Solving the Problems] In order to achieve the above object, the present invention is a method for rehabilitating an aged portion of an existing pipe buried underground under which a mounting pipe communicating with the ground is branched. In the step of arranging a rehabilitation pipe having an outer diameter smaller than the inner diameter of the existing pipe inside the existing pipe, inserting a sealing device having an inflatable expansion bag at the tip through the mounting pipe, and mounting A step of sealing the joint between the pipe and the existing pipe by expansion of the expansion bag, a step of injecting and filling a liquid backfill filler into the gap between the existing pipe and the rehabilitation pipe,
After the backfilling filler has solidified, the sealing device is released and it is withdrawn from the mounting pipe, the step of inserting a perforation device through the mounting pipe and perforating the rehabilitation pipe with the cutter. And Then, as a device for achieving the above method, the installation pipe communicating with the ground is inserted into the installation pipe of the existing pipe that is buried underground and the rehabilitation pipe and the existing pipe inserted into the existing pipe. Is a device for closing the gap of the flexible shaft, a hollow flexible shaft, an expansion bag attached to the distal end of the flexible shaft, an air hose inserted into the flexible shaft and communicating with the expansion bag, and a base fixed to the flexible shaft. And a reaction force member that exerts a reaction force on the reaction force body on the ground portion.

In addition, a mounting shaft that communicates with the ground is inserted into the existing mounting pipe that is buried underground and is a device that pierces a rehabilitation pipe in the existing pipe, and a flexible shaft having a flexible shaft inside. Tube, a cutter rotatably attached to the tip of the flexible shaft tube and rotated by the flexible shaft, a support tool arranged at a predetermined interval in the longitudinal direction of the flexible shaft tube, and a base portion of the flexible shaft tube. And a lever that presses the receiving device with an abutment arranged above the ground as a fulcrum.

In the above description, the above-ground portion includes a portion other than the mounting pipe, that is, a rainwater basin.

[Action]

In the use of the sealing device of the present invention, the flexible shaft is inserted following the bending of the mounting tube, and the filling pressure of the backfill filler applied to the expansion bag is supported by the reaction member, and the expansion bag is inserted into the mounting tube. It will not be pushed back.

Further, according to the punching device of the present invention, the thrust is obtained by pressing the lever against the receiver, and the movement (stroke) of the cutter is followed by shifting the fulcrum of the lever.

〔Example〕

An embodiment of a method for rehabilitating an aged pipe in an underground buried pipe and an apparatus thereof according to the present invention will be described with reference to the drawings.

FIG. 1 shows a vertical structure of a sewer pipe in which the present invention is implemented, and FIG. 2 shows an AA cross section thereof.

In the figure, 1 is an existing sewer pipe buried in the ground E, and the flow of the sewer pipe 1 flows from upstream (left in the figure) to downstream (right in the figure). Then, the sewer pipe 1 is joined with a mounting pipe 3 led from a rainwater basin 2 provided in a gutter of a road on the ground to collect the running water on the ground. The attachment pipe is usually guided horizontally from the vicinity of the lower part of the rainwater basin 2 to the top of the sewer pipe 1 or the vicinity thereof, and is therefore generally arranged in a bent state.

In such a sewer pipe 1, ground subsidence occurs due to an excessive traffic load on the ground or a soft ground, and the sewer pipe 1 is gradually damaged and deteriorated. Then, this old section will be the target section for rehabilitation work.

Hereinafter, description will be given according to the construction procedure of this rehabilitation work.

(1) First, vertical holes 4 and 5 are formed on the upstream side and the downstream side of the aging section, and the rehabilitation pipe 6 is inserted through the vertical holes 4 and 5.
(6a, 6b ...) Are carried in and inserted into the sewer pipe 1 while joining the pipes of each unit. Note that existing manholes may be used for the vertical holes 4 and 5.

The rehabilitating pipe 6 has a sufficiently small outer diameter so that it can be easily inserted in consideration of the bending (unstable) of the aged pipe, and a synthetic resin pipe is usually adopted.

(2) After the rehabilitation pipe 6 is inserted into the sewer pipe 1, the vertical hole 4,
The gap is closed like a wall with a watertight closing member 7 facing the opening 5. An air vent pipe 8 is inserted in the upper part of the upstream closing wall 7, and an injection pipe 9 for filling the backfill filler is inserted in the downstream closing wall 7. The injection pipe 9 is a mixing / stirring tank 1 on the ground via a pump P.
It is led to 0.

On the other hand, in the mounting pipe 3, the sealing device 12 is attached to the expansion bag (packer) 13 at the tip end from the ground portion through the rainwater basin 2.
To reach the rehabilitation pipe 6 and arrange them.

Here, the sealing device 12 includes an expansion bag 13 at the tip, a hollow flexible tube 14 connected to the expansion bag 13, and the flexible tube 14
It includes an air hose 15 inserted therein and a reaction force member 16 arranged at the base of the flexible tube 14, and further, a valve 17 and a foot pump 18 arranged at the end of the air hose 15.
Including etc.

More specifically, the expansion bag 13 is made of a rubber material and inflates when supplied with air from the air hole 15a at the tip of the air hose 15. The expansion diameter of the expansion bag 13 is about the same as the inner diameter of the mounting tube 3. Alternatively, it may be larger than the inner diameter of the mounting tube 3. FIG. 3 shows a contracted state of the expansion bag 13.

The flexible tube 14 has a certain degree of rigidity, and properly follows the curvature of the mounting tube 3 and transmits the axial force. The tip end of the flexible shaft 14 is fitted and fixed to a fixture 15b at the base of the expansion bag 13, and the reaction member 16 is fitted and fixed to the base.

The reaction force member 16 includes an end fitting 20 and a bolt 21. The end fitting 20 has a substantially circular hollow cylindrical shape, and the flexible tube 14 is fitted and fixed to the protruding flange 20a at the end of the end fitting 20, and the air hose 15 is pulled out from the window 20b. Further, the threaded portion of the bolt 21 is screwed into the screw hole 20c, and the rotation of the bolt 21 adjusts the forward / backward movement of the end fitting 20.

The reaction force member 16 is installed by being pressed against the wall surface of the rainwater basin 2 via an appropriate interposing plate 23 on the rainwater basin 2. The interposition plate 23 can be omitted as appropriate.

Using this sealing device 12, the mounting pipe 3 and the sewer pipe 1
The sealing of the joint portion with and is performed as follows.

That is, the flexible tube 1 with the expansion bag 13 at the tip contracted
4 is inserted into the attachment pipe 3 through the rainwater basin 2, and the expansion bag 13 is inserted until it reaches the rehabilitation pipe 6 (see FIG. 3). Next, the foot pump 18 is operated by depressing the expansion bag 13 to inflate the tip thereof against the surface of the rehabilitation pipe 6 (see FIG. 2).

In this state, as shown in FIG. 1, the backfill filler 25 on the back of the foamed cement is injected from the injection pipe 9. At this time,
The filling pressure of the backfill filler 25 acts on the expansion bag 13 to push back the entire sealing device 12, but the reaction force is applied by the reaction force member 16, so that the expansion bag 13 is removed from the surface of the rehabilitation pipe 6. Never leave. In this way, the backfill filler 25 is applied to the gap between the sewer pipe 1 and the rehabilitation pipe 6.

(3) When the backfill filler 25 sufficiently spreads in the gap between the sewer pipe 1 and the rehabilitation pipe 6 and the filler 25 is solidified, the expansion bag 13 is contracted and the sealing device 12 is attached to the pipe. Three
Pull out from inside. At this time, if a release agent is applied to the surface of the expansion bag 13, it can be pulled out more easily.

(4) Next, the punching device 30 is inserted into the mounting pipe 3 through the rainwater basin 2, and the cutter 31 at the tip thereof reaches the rehabilitation pipe 6. FIG. 4 shows this state.

This punching device 30 includes a cutter 31 at the tip, a flexible shaft 32 that transmits rotational power to the cutter 31, a flexible shaft tube 33 that houses and holds the flexible shaft 32, and a flexible shaft tube 3
3, a support tool 34 mounted on the outer circumference of the flexible shaft tube 3, a receiving tool 35 fixed to the base of the flexible shaft tube 33, and a thrust adding means 36 disposed in the rainwater trough 2. Further, it includes a rotary drive source 37 arranged on the ground.

More specifically, the cutter 31 is composed of a cylindrical cutter body 31a and a center cone 31b. 31c is a cutter blade. The cutter 31 is rotatably supported by the cutter 31 and is attached to the distal end of the flexible shaft tube 33 via a mounting portion 38 having a detachable function and is rotated by the rotation of the flexible shaft 32.

The flexible shaft tube 33 has flexibility and is inserted from the ground portion through the rainwater basin 2 so as to follow the bending of the mounting tube 3. The rear end of the flexible shaft tube 33 is connected to the rotary drive source 37 through a coupling 39 together with the flexible shaft 32.

The support member 34 is a two-piece body, is integrally assembled with a bolt 34a, and has a wing portion 34c protruding radially from the cylindrical portion 34b. The support tool 34 is fixed to the outer circumference of the flexible shaft tube 33 at a plurality of cylindrical locations at appropriate intervals. The outer diameter of the wing portion 34b is made slightly smaller than the inner diameter of the mounting tube 3, so that the insertion into the mounting tube 3 is not hindered. Due to the support member 34, the flexible shaft tube 33 does not lose its flexibility and the rigidity against buckling can be increased.

The receiving member 35 is also a two-piece body, is integrally assembled with a bolt 35a, and is fixed to the base portion of the flexible shaft tube 33 with its position adjusted.

The thrust adding means 36 includes an abutment 40 and a lever 41.
The abutment 40 can be installed in the rainwater basin 2, the upper surface of which is inclined toward the inlet of the mounting pipe 3, and a plurality of grooves 40a are provided on the upper surface. The lever 41 is composed of a lever lever portion 41a manually operated and a pressure portion 41b which is bifurcated from a lower portion of the lever rod portion 41a.
The lower end of b is formed into an acute angle and is fitted into the groove 40a of the abutment 40.

Using this punching device 30, the rehabilitation pipe 6 is drilled at the communication port to the attachment pipe 3 as follows.

That is, the abutment 40 is not yet installed in the rainwater basin 2, the cutter 31 is attached to the tip of the flexible shaft tube 33, and the cutter 31 is inserted into the mounting pipe 3 through the rainwater basin 2. With this insertion, the support tool 34 is attached to the flexible shaft tube 33, and the cutter 31 at the tip reaches the rehabilitation tube 6. In this state,
The receiving tool 35 is attached to the flexible shaft tube 33 in the rainwater basin 2, and the abutment 40 is installed in the rainwater basin 2.

Then, the rotary drive source 37 is driven, the rotary drive is given to the flexible shaft 32, and the cutter 31 is rotated. At the same time, the lever 41 of the thrust applying means 36 is tilted in the direction shown in FIG. 4, and its pressing portion 41b is pressed against the receiver 35 to apply a thrust force to the flexible shaft tube 33 and thus the cutter 31. At this time,
The support tool 34 prevents the flexible shaft tube 33 from buckling.

(5) When the rehabilitation pipe 6 is perforated by the cutter 31, the cut piece is locked by the center cone 31b of the cutter 31,
Simultaneously with the pulling out of the punching device 30, it is removed to the ground.

As described above, the communication port for the rehabilitation pipe 6 to the mounting pipe 3 is opened, and the construction is completed. However, in some cases, the communication port is finished.

As described above, according to the method of the present embodiment, there is no intrusion of the backfill filler 25 in the vicinity of the connection portion of the sewer pipe 1 of the mounting pipe 3, and only the rehabilitating pipe 6 is pierced at the communication port to the rehabilitating pipe 6. As a result, work efficiency is improved. If the sealing device 12 is removed, there is nothing left behind, and the drilling operation is performed efficiently. Further, even if the backfill filler 25 remains near the connecting portion and it is necessary to cut the filler 25 and a stroke is required, the punching device 30 applies a thrust force over a sufficient stroke by the thrust applying means 36. Therefore, such a situation can be dealt with.

The sealing device 12 of the present embodiment opposes the filling pressure of the filling material 25 by the reaction force member 16 thereof and is not pushed back to secure the communication port. Further, the main sealing device 12
Can be used repeatedly and constantly.

The punching device 30 of this embodiment can obtain a sufficient thrust by a simple thrust adding means and can be economically manufactured.

C. EFFECTS OF THE INVENTION The method for rehabilitating an aged pipe of the present invention and its device have the following unique effects.

According to the method of the present invention, the sealing of the connection between the existing pipe and the mounting pipe and the perforation of the rehabilitation pipe are easily performed via the mounting pipe, and the construction efficiency in this type of construction is improved. In particular, since the piercing work is performed on the rehabilitation pipe as much as possible, there is no other extra piercing work and the efficiency is high.

Advantageous Effects of Invention According to the sealing device of the present invention, it is possible to sufficiently withstand the pressure of the backfill filler, and to reliably ensure a filler-free space reaching the communication port of the rehabilitation pipe at the connection portion between the existing pipe and the mounting pipe. You can

The boring device of the present invention has the advantages that the means for obtaining the required thrust is simple, the structure is simple overall, and the use is easy.

[Brief description of drawings]

The drawings show an embodiment of a method for rehabilitating an aged pipe according to the present invention and an apparatus therefor. Fig. 1 is a longitudinal sectional view showing an entire sewer pipe in which the present invention is carried out. 1 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a view showing a contracted state of the sealing device, and FIG.
5 is a sectional view similar to FIG. 5, FIG. 5 is a sectional view taken along line BB of FIG. 4,
FIG. 6 is a cross-sectional view taken along the line CC of FIG. 1. 1: Existing pipe (sewer pipe), 3: Mounting pipe, 6: Rehabilitation pipe,
12: sealing device, 13: expansion bag, 14: flexible shaft, 15:
Air hose, 16: Reaction force member, 25: Backfilling filler, 3
0: punching device, 31: cutter, 32: flexible shaft, 33:
Flexible shaft tube, 34: support tool, 35: receiving tool, 40: abutment, 4
1: Lever

Claims (3)

[Claims] 1. A method of rehabilitating an aged portion of an existing pipe buried underground which has a branching installation pipe communicating with the ground, wherein the existing pipe has an outer diameter smaller than the inner diameter of the existing pipe. Disposing a rehabilitation pipe, inserting a sealing device having an inflatable expansion bag at the tip through the mounting pipe, and sealing the joint between the mounting pipe and the existing pipe by expanding the expansion bag. A step of injecting and filling a liquid backfilling filler into the gap between the existing pipe and the rehabilitating pipe, releasing the sealing device after the backfilling filler solidifies, and removing from the mounting pipe, A method of rehabilitating an aged pipe, comprising the step of inserting a perforation device through the attachment pipe and perforating the rehabilitation pipe with the cutter. 2. A device for inserting a fitting pipe communicating with the ground into a branching existing pipe buried underground and closing a gap between the rehabilitating pipe inserted into the existing pipe and the existing pipe. There is a hollow flexible shaft, an expansion bag attached to the tip of the flexible shaft, an air hose that is inserted into the flexible shaft and communicates with the expansion bag, and is fixed to the base of the flexible shaft to provide a reaction force on the ground. A sealing device comprising: a reaction force member that exerts a reaction force on the body. 3. A device for piercing a rehabilitation pipe in an existing pipe, wherein a mounting pipe communicating with the ground is inserted into the existing pipe buried underground and having a flexible shaft therein. A flexible shaft tube, a cutter rotatably attached to the distal end of the flexible shaft tube and rotated by the flexible shaft, and a supporter arranged over a predetermined interval in the longitudinal direction of the flexible shaft tube, A punching device comprising: a receiver fixed to the base of the flexible shaft tube; and a lever that presses the receiver with an abutment arranged on the ground as a fulcrum.