JPH08424B2 - Hard tube lining method for the inner surface of the existing pipe under running water - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a lining by using a hard tube on the inner surface of an existing pipe in running water.

[0002]

[Prior art and its problems] When existing pipes buried underground, such as city gas pipes and sewer pipes, are deteriorated, infiltration of groundwater occurs from pipe joints and corrosion holes, and repair is necessary. Become.

As a repairing method for such an existing pipe, a repairing method has been proposed and implemented in which a hard tube lining is formed on the inner surface of the pipe by applying a heating and pressurizing expansion method and the lining prevents the infiltration of groundwater. There is.

Among the objects to be repaired, the existing pipes which are considerably deteriorated and are buried in the place where the groundwater level is relatively high are brought into a running water state by the infiltration of groundwater. If you try to form a hard tube lining on the inner surface of a pipe that is in running water by applying the heating and pressure expansion method, the heat that heats the hard tube from the inside will be taken away by the running water that flows outside the tube, and the tube heating There is a problem that expansion due to pressure becomes difficult. In this case, it is conceivable to fill the pipe joints and corrosion holes with a waterproofing agent from the inside of the pipe to stop the infiltration of groundwater, and then form a hard tube lining on the inner surface of the pipe. It takes a lot of manpower and time, which causes a rise in construction costs, and is not a preferable solution.

The present invention has been made for the purpose of eliminating such conventional problems.

[0006]

SUMMARY OF THE INVENTION The present invention is applied to a defect in a pipe.
When the hard tube lining is formed on the inner surface of the existing pipe that is in the running water state by the application of the heating and pressure expansion method, the cross section shape is reduced by flattening by making it a slightly smaller diameter than the above pipe as a hard tube. After the flattened tube is inserted into the tube according to a conventional method, the tube is restored to its original cross-sectional shape by heating and pressurizing from the inside, and the tube and the shape-returning tube are formed at both ends of the existing tube. By sealing the gap between the
Membrane-like encapsulation in the space between the shape restoration tube and the tube
No membranous retention water, then the membranous retention water in the tube
After raising the temperature by heating the
While expanding by heating and pressurizing the film,
As the tube expands, it goes into the ground through the tube defect.
The present invention relates to a hard tube lining method for an inner surface of an existing pipe under running water, which is characterized by pushing back toward the outside .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to the accompanying drawings.

FIG. 1 shows the state of the process of inserting the hard tube 2 into the existing tube 1.

[0009] Hard tube 2 is polyvinyl chloride, polyethylene <br/> Ji les down a thermoplastic plastic such as polypropylene, is formed into a circular tubular outer diameter slightly smaller than the inner diameter of the existing pipe 1 ing.

The hard tube 2 is flattened by applying a heating / pressurizing roll or the like, and when the cross-sectional shape is reduced (see FIG. 2), the wire 3 is drawn into the existing tube 1,
It is inserted by applying conventional means. By the way, groundwater enters the existing pipe 1 through pipe joints (not shown), corrosion holes, cracks (not shown), etc. that have deteriorated or lost water resistance due to aging, and running water 4 is generated. ing. The running water 4 is exaggerated in FIG.

FIG. 3 shows the state of the shape restoring process of the flattened tube 2 (see FIG. 2) inserted into the existing tube 1. In the shape restoring process, after the both ends of the tube 2 are plugged with 5.5 ', heating fluid such as steam is introduced into the tube 2 through the supply port 6 of one of the plugs 5 and the supply line 7 connected thereto. On the other hand, the heating fluid is discharged from the discharge port 8 of the other plug 5'and the discharge line 9 connected thereto. The supply amount and the discharge amount of the heating fluid are controlled by adjusting the opening degrees of the valves 10 and 11 on the lines 7 and 9, and the inside of the tube 2 is maintained in a pressurized state by this flow rate control. The flattened tube 2 is restored to its original circular cross-section by heating and pressurizing the flattened tube 2 from the inside. Since the flattened tube 2 memorizes the initial circular cross-sectional shape, this shape restoration can be easily and surely performed even under a heating condition where heat is taken away by the running water 4. The state of the shape restoring tube 2'is shown in FIGS.

FIG. 5 shows the state of the process of sealing the gap 12 formed between the shape restoring tube 2'and the existing pipe 1, and a sealing device is applied for sealing.

As shown in FIG. 6, the sealing device has a rear insertion port 13a having an inner diameter substantially equal to the outer diameter of the existing pipe 1 and a front insertion port 13b having an inner diameter substantially equal to the outer diameter of the shape restoring tube 2 '.
A short tube 13 having an inner diameter, a rear push wheel 14 and a rear seal rubber ring 15 having an inner diameter substantially equal to the outer diameter of the existing tube 1, and a front push wheel 1 having an inner diameter substantially equal to the outer diameter of the shape restoring tube 2 '.
4'and a front seal rubber ring 15 '.

The mouth-sealing device is attached with the lines 7 and 9 removed and the lines 7 and 9 removed at the outlets 6 and 8, and the parts are sequentially inserted from the end of the shape restoring tube 2 '.
As shown in FIG. 6, it is installed at a predetermined portion, and in this installed state, the front and rear push wheels 14 ′, 14 are attached to the front and rear outlets 13 b, 13 a of the short pipe 13 at the flange portions of the front and rear, respectively. Are connected via bolts and nuts 16 ', 16. When the rear push-wheel 14 is pulled toward the rear insertion port 13a side by operating the rear bolt nut 16 in the state shown in FIG. 6, the rear seal rubber ring 15 is pressed and deformed and pressure-bonded to the outer peripheral surface of the existing pipe 1 to Seal the sides. After that, booster wheel 1
4 is fixed to the existing pipe 1 by a set screw (not shown). Next, the front push wheel 1 is operated by operating the front bolt nut 16 '.
When 4'is pulled toward the front insertion port 13b side, the front seal rubber ring 15 'is pressed and deformed and pressure-bonded to the outer peripheral surface of the shape restoring tube 2', thereby sealing the front side of the short tube 13. Such a sealing device is attached to both ends of the existing pipe 1,
By this attachment, the running water 4 in the pipe is completely stopped, and thereafter, the running water 4 stays in the gap 12 as accumulated water 4 '. This state is shown in FIG.

After sealing both ends of the gap 12 and stopping the running water 4, the lines 7 and 9 are again connected to the supply and discharge ports 6 and 8 to supply the heating fluid such as steam into the shape restoring tube 2 '. Is started, and the accumulated water 4'is heated by the supply of steam, and the temperature rises. The heating temperature of the accumulated water 4'is
As shown in FIG. 4, the tube 2'restores its shape and stays there.
The water 4'is formed into a film around the tube 2'and the tube
Make sure that the amount of steam distributed in 2'is sufficiently secured.
Therefore, the total amount of accumulated water is heated and heated almost uniformly.
Can be When the heating and pressurization of the tube 2'starts after waiting for the temperature rise of the accumulated water 4 ', the accumulated water 4'
As the temperature rises, the heat loss is reduced, and the tube 2'can be expanded without any trouble as in the case of normal working conditions. Pressing in this case the tube 2 'is required to be performed in groundwater pressure (usually 0 · 2~1.0kg / cm ²⁾ pressure higher than (e.g. 0.5~2.0kg / cm ^2), Due to this pressure difference, the accumulated water 4'is
The tube 2 ′ can be pushed back into the ground through the in-tube defects such as corrosion holes and cracks (not shown), and the tube 2 ′ can be expanded sufficiently reliably to the expansion limit, that is, the state in which it is pressed against the inner surface of the tube 2.

7 to 8 show the state after the heating and pressurizing / expanding operation, in which the hard tube lining 2 '' is formed on the inner surface of the existing pipe 1 substantially without forming a gap.

[0017]

To the present invention method existing pipe in the pipe flowing water conditions According to the present invention, direct rigid tube lining without the need for Do <br/> any troublesome pretreatment step for every time water stop processing the tube defect Can be formed, and under the adverse condition of flowing water in the pipe
It becomes possible to efficiently carry out the inner surface lining of the pipe regardless of the above construction .

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing a situation of an inserting process of a flattened hard tube into an existing pipe in a method of the present invention.

FIG. 2 is a sectional view taken along the line 2-2 of FIG.

FIG. 3 is an explanatory view schematically showing the state of the shape restoring step of the flattened tube in the method of the present invention.

4 is a cross-sectional view taken along line 4-4 of FIG.

FIG. 5 is an explanatory view schematically showing the situation of the sealing step in the method of the present invention.

FIG. 6 is a partially enlarged view showing a mounting state of the mouth sealing device.

FIG. 7 is an explanatory view schematically showing a formation state of a hard tube lining in the method of the present invention.

8 is a sectional view taken along line 8-8 of FIG.

[Explanation of symbols]

 1 Existing pipe 2 Flattened hard tube 3 Wire 4 Running water 5 Stopper 6 Supply port 7 Supply line 8 Discharge port 9 Discharge line 10 Valve 11 Valve 12 Gap 13 Short pipe 14 Push ring 15 Seal rubber ring 16 Bolt nut

Claims (1)

[Claims] Upon 1. A by application of heat and pressure expansion method in existing pipe surface in the tube <br/> running water state by infiltration of groundwater from tube defects forming hard tube lining, than the tube as hard tube Use a tube with a slightly smaller diameter to reduce its cross-sectional shape by flattening.After inserting the flattened tube into the tube according to the usual method, restore the initial cross-sectional shape by heating and pressurizing from the inside, and use the existing tube. Seal the gap between the tube and the shape restoration tube at both ends of the tube
By doing so, the flowing water can be restored between the shape restoration tube and the tube.
It is sealed in a film in the space between them to form a film of accumulated water, then
After heating the filmy accumulated water by heating from inside the tube
Then, expand the tube again by heating and pressurizing it from the inside.
On the other hand, the film-like accumulated water is expanded as the tube expands.
Pushing it back into the ground through the defect in the pipe.
Rigid tube lining method in existing pipe surface under running water, characterized in.