JPH0730867B2 - 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 construction method, specifically, a backfill material is filled in the gap between the aging part of the sewer pipe connected to the rainwater basin on the ground by the attachment and the rehabilitation pipe inserted in the aging part, The present invention relates to a method and an apparatus for opening a communication hole with a mounting pipe in a rehabilitation pipe.

[Conventional technology]

In this type of aging pipe rehabilitation method, as a technique for piercing a rehabilitation pipe inserted into an existing pipe through a mounting pipe
63-232905 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 rehabilitation pipe is rather normal from the viewpoint of facilitating the insertion of the rehabilitation pipe. Further, when the mounting pipe is arranged so as to be deviated from the pipe axis of the existing pipe, that is, eccentrically arranged with respect to the existing pipe, the drilling work by the above-mentioned known technique becomes more difficult.

Not only that, but the communication hole deviates from a perfect circular shape to an extremely inertial circular shape, which increases the resistance of the flowing water flowing from the mounting pipe and causes clogging.

[Problems to be solved by the invention]

In view of the above circumstances, the present invention is a pipe connection method that is effective even when the mounting pipe is eccentrically arranged with respect to the existing pipe in the method of rehabilitating an aged pipe in which a rehabilitation pipe is inserted into the existing pipe with a gap. An object of the present invention is to provide a method of opening a communication hole of a part and an apparatus used for the method.

B. Configuration of the Invention [Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for rehabilitating an aged portion of an existing pipe buried underground where a mounting pipe communicating with the ground is branched. A step of mounting a plug body from the inside of the existing pipe inside the branch portion between the mounting pipe and the existing pipe,
Arranging a rehabilitation pipe having an outer diameter smaller than the inner diameter of the existing pipe inside the existing pipe, injecting a liquid backfilling filler into the gap between the existing pipe and the rehabilitating pipe, After the backfill filler is solidified, a punching device is inserted through the attachment pipe, and a center drill that holds the central axis position of the attachment pipe penetrates the plug body, the backfill filler and the rehabilitation pipe. The method is characterized by the following steps: a step of forming a fine hole, and a step of expanding the diameter of the fine hole by cutting to open a communication hole continuous with the central axis of the rehabilitating pipe.

Further, the present invention is an apparatus for use in the above method, wherein the installation pipe communicating with the ground is inserted into the installation pipe of an existing pipe that is buried underground and the rehabilitation pipe in the existing pipe is pierced. A flexible shaft tube having a flexible shaft, a drill rotatably attached to the tip of the flexible shaft tube and rotated by the flexible shaft, and a drill arranged over a predetermined interval in the longitudinal direction of the flexible shaft tube. And a lever fixed to the base of the flexible shaft tube and a lever for pressing the receiver with an abutment arranged on the ground as a fulcrum. apparatus.

[Action]

In the rehabilitation method of the present invention, in the step of expanding the pores,
Drilling is performed according to the material of the rehabilitation pipe, backfilling filler, and plug body.

According to the drilling device of the present invention, thrust is obtained by pressing the lever against the receiving member, and the movement (stroke) of the drill 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 transverse structure including a sewerage pipe in which the present invention is implemented.

In the figure, 1 is an existing sewer pipe buried in the ground E, and a sewer pipe 1 is joined to the sewer pipe 1 on the ground from a rainwater basin 2 provided in a gutter of a road. The water flowing from the ground is collected.

The attachment pipe 3 is normally guided horizontally from the vicinity of the lower part of the rainwater basin 2 to the top of the sewer pipe 1 or its vicinity, and is therefore generally arranged in a bent state.

In the present embodiment, the mounting pipe 3 is attached to the existing pipe 1 so as to deviate from the pipe axis O of the existing pipe 1 and eccentrically.

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, in this aging section, the plug body 5 is mounted in the outlet portion of the mounting pipe 3 from within the existing pipe 1 (see FIG. 1).

The plug 5 is substantially a cylinder, and the front surface 5a thereof is the existing pipe 1.
It is cut diagonally so that it does not project inward, forming a so-called truncated cylinder. Also, a conical cut 5c is formed in the center of the rear surface 5b.
Is recessed.

The diameter of the plug 5 is substantially equal to the inner diameter of the mounting tube 3, and when the plug 5 is inserted into the mounting tube 3, its side surface
5d closely contacts the inner surface of the mounting tube 3.

The plug 5 is made of wood as a material. This is to facilitate the drilling of a drill described later.

The stopper 5 does not prevent the use of other materials, for example, plastic materials.

(2) Vertical holes are provided on the upstream side and the downstream side in the direction perpendicular to the drawing across the aging section, and the rehabilitation pipe 6 is provided through these vertical holes.
Is carried in and is inserted into the sewer pipe 1 while joining the pipes of each unit. In addition, an existing manhole may be used as the vertical hole.

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.

(3) After the rehabilitation pipe 6 is inserted into the sewer pipe 1, the gap is closed like a wall with a watertight closing member facing the vertical hole. An air vent pipe is inserted above the upstream blocking wall, and an injection pipe for filling the backfill filler is inserted into the downstream blocking wall. A solid backfill filler 8 such as cement milk is injected by pumping through the injection pipe.

(4) Wait for the backfill filler 8 to spread sufficiently into the gap between the sewer pipe 1 and the rehabilitation pipe 6 and to solidify the filler 8 (see FIG. 2).

(5) Next, the punching device 10 is inserted into the mounting pipe 3 through the rainwater basin 2, and the drill 11 at the tip thereof reaches the plug body 5 (FIG. 3).

This punching device 10 is, as shown in FIGS.
A drill 11 at the tip, a flexible shaft 12 for transmitting rotational power to the drill 11, and a flexible shaft tube for accommodating and holding the flexible shaft 12 therein.
13, a support tool 14 mounted on the outer circumference of the flexible shaft tube 13, a receiving tool 15 fixed to the base of the flexible shaft tube 13, and a thrust adding means 16 arranged in the rainwater trough 2. And further includes a rotary drive source 17 arranged on the ground.

More specifically, the drill 11 is attached to the tip of the movable shaft tube 13 via a chuck 18 which rotatably supports the drill 11 and has a detachable function, and is rotated by the rotation of the flexible shaft 12.

The flexible shaft tube 13 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 flexible shaft tube
The rear end of 13 is connected to the rotary drive source 17 through the coupling 19 together with the flexible shaft 12.

The support 14 is a two-piece body, is integrally assembled with a bolt 14a, and has a wing portion 14c that radially projects from the cylindrical portion 14b. The support tool 14 is fixed to the outer circumference of the flexible shaft tube 13 at a plurality of positions with appropriate intervals. Wings 14
The outer diameter of b is slightly smaller than the inner diameter of the mounting tube 3, so that it does not hinder the insertion into the mounting tube 3. The support 14 allows the flexible shaft tube 13 to retain its flexibility and increase its rigidity against buckling.

The receiving member 15 is also a two-piece body, is integrally assembled with the bolt 15a, and is fixed to the base portion of the flexible shaft tube 13 with its position adjusted.

The thrust adding means 16 comprises an abutment 20 and a lever 21. Abutment 20
Can be installed in the rainwater basin 2 and the pipe 3
Of the plurality of grooves 20a which are inclined toward the entrance of
Is recessed. The lever 21 is composed of a lever lever portion 21a manually operated and a pressure portion 21b which is bifurcated from the lower portion of the lever lever portion 21a, and the lower end of the pressure portion 21b is formed into an acute angle.
It is fitted into the groove 20a of the abutment 20.

(6) Using this punching device 10, the plug 5 and the filler 8
-Perforation of the rehabilitation pipe 6 is performed as follows.

That is, the abutment 20 is not yet installed in the rainwater basin 2, the drill 11 is attached to the tip of the flexible shaft tube 13, and this is inserted into the mounting pipe 3 through the rainwater basin 2. With this insertion, the support tool 14 is attached to the flexible shaft tube 13 so that the drill 11 at the tip reaches the rear surface 5b of the plug body 5. The tip of the drill 11 is guided to the notch 5c in the rear surface 5b of the plug 5 and the center position is maintained.
In this state, the support 15 is attached to the flexible shaft tube 13 in the rainwater basin 2, and the abutment 20 is installed in the rainwater basin 2.

Then, the rotary drive source 17 is driven to apply a rotary drive force to the flexible shaft 12 to rotate the drill 11. At the same time, the lever 21 of the thrust adding means 16 is tilted in the direction of FIG. 3A, and the pressing portion 21b thereof is pressed against the receiver 15 so that the flexible shaft tube 13 and thus the drill 1 can be operated.
Give thrust to one. At this time, the support tool 14 prevents the flexible shaft tube 13 from buckling.

In this way, a hole having the same outer diameter as the drill 11, that is, a small hole 23 is formed in the plug body 5, the filler 8 and the rehabilitation pipe 6.

(7) Remove the punching device 10 from the mounting pipe 3.

(8) An operator enters the rehabilitation pipe 6 and expands the diameter of the pore 23 from the inside of the rehabilitation pipe 6 centering on the pore 23 bored by the above-described work (see FIG. 6).

For the diameter expansion work, an electric tool 24 equipped with an appropriate cutting tool such as a drill, a cutter, or a grinder is used.

In this diameter expansion work, the rehabilitation pipe 6, the filler 8 and the plug 5 to be cut are made of different materials,
A cutting tool suitable for each material is selected.

In this way, the communication port 25 is opened.

By the above, the communication port 25 for the rehabilitation pipe 6 to the mounting pipe 3 is opened, and the construction is completed, but the communication port 25 is subjected to finishing processing in some cases.

As described above, according to the method of this embodiment, when the mounting pipe 3 is eccentrically arranged with respect to the existing pipe 1, the eccentricity is corrected as much as possible so that the communication port 25 faces the pipe axis 0. That is, in other words, the state is as close to a perfect circle as possible. As a result, the flow of running water from the mounting pipe 3 to the sewer main is smoothly performed without causing resistance.

Further, in this drilling work step, when the drilling length (stroke) of the drill 11 is long, the thrust adding means 16 can freely extend the stroke, and the method of this embodiment is not hindered.

The punching device 10 of the present 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, even when the mounting pipe is eccentrically arranged with respect to the existing pipe, there is no hindrance to the drilling work of the communication hole, and the communication port has a perfect circular shape as much as possible. Is formed, and the inflow resistance of the flowing water from the mounting pipe is made as small as possible.

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 and apparatus for rehabilitating an aged pipe of the present invention. Fig. 1 is a cross-sectional view including a mounting pipe portion of a sewer pipe in which the present invention is implemented, and Fig. 2 is a sewer pipe rehabilitation. Fig. 3 is a state diagram during construction with the pipe inserted, Fig. 3 is a state diagram of the punching work by the punching device, Fig. 4 is a sectional view taken along the line AA of Fig. 3, and Fig. 5
FIG. 6 is a sectional view taken along the line BB in FIG. 3, and FIG. 6 is a diagram showing a work state of expanding the diameter of the communication hole. 1: Existing pipe (sewer pipe), 3: Mounting pipe, 5: Plug, 6: Rehabilitation pipe, 8: Filler, 10: Drilling device, 11: Drill, 12: Flexible shaft, 1
3: Flexible shaft tube, 14: Support tool, 15: Receptacle, 20: Abutment, 21: Lever, 23: Pore, 25: Communication hole

Claims (3)

[Claims] 1. A method of rehabilitating an aged portion of an existing pipe buried underground where a mounting pipe communicating with the ground is branched, wherein a plug body is provided inside the branch pipe between the mounting pipe and the existing pipe from inside the existing pipe. A step of mounting, a step of disposing a rehabilitation pipe having an outer diameter smaller than the inner diameter of the existing pipe inside the existing pipe, and a liquid backfilling filler is injected and filled into a gap between the existing pipe and the rehabilitation pipe After the solidification of the backfill filling material, a punching device is inserted through the mounting tube, and the plug body, the backfilling filling material, and the rehabilitation tube are inserted by a center drill that holds the central axis position of the mounting tube. Reforming an aged pipe characterized by comprising: a step of penetrating through a hole, a step of expanding the diameter of the hole around the hole by cutting to open a communication hole continuous with the central axis of the rehabilitating tube. Method. 2. The method for rehabilitating an aged pipe in an underground buried pipe according to claim 1, wherein a notch is formed at the center of the rear surface of the plug. 3. A device for piercing a rehabilitating pipe in an existing pipe that is installed underground and has a flexible pipe inside, the mounting pipe communicating with the ground being inserted into the existing pipe. A flexible shaft tube, a drill rotatably attached to the distal end of the flexible shaft tube and rotated by the flexible shaft, and a support tool 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.