JPH05212792A - Method for reclaiming installed sewer pipe - Google Patents

Abstract

PURPOSE:To provide a method for reclaiming an installed sewer pipe in which the frictional resistance of the flow in a pipe with a smooth inner surface is reduced so that the flow capacity of the pipe is not affected to decrease. CONSTITUTION:Compressed air is charged from the one end 3b of an installed sewer pipe 3 into the pipe sewer 3 to push a flexible hose 8 containing a photosetting resin to the inside wall surface 3a of the sewer pipe 3 and to generate the air flow A in the direction from the one end 3b to the other end 3c of the sewer pipe 3. The flexible hose 8 is hardened by the radiation of ultraviolet rays while an ultraviolet radiation apparatus 10 installed in the hose 8 being moved in the backward direction B against the air flow A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rehabilitating existing pipes such as water pipes and sewer pipes already installed.

[0002]

2. Description of the Related Art Generally, fume pipes, ceramic pipes, cast iron pipes and the like are widely used as water pipes and sewer pipes buried in the ground. The inner peripheral surface of these pipes is eroded by hydrogen sulfide and other corrosive gases and deposits and deteriorates due to long-term use, and the pipe thickness becomes thin, and the strength decreases. Also, due to ground pressure or ground subsidence, the seam between pipes will be displaced and a gap will be created, or cracks will occur in part of the pipe due to earth load, etc. Water flowing into the pipe or flowing into the pipe can leak into the ground. Due to the infiltration or leakage of groundwater etc. into the pipe pit, the sediment around the pipe pit may flow out to form a cavity on the back of the pipe pit, which may cause a road surface depression.

As a countermeasure against this, for example, an uncured flexible hose containing a photocurable resin is introduced into an existing pipe such as a sewer pipe while being inverted by compressed air, and is pushed along the inner wall surface of the pipe. After that, a method of rehabilitating the existing hose by irradiating the hose with an ultraviolet irradiation device to cure the hose to form a water impermeable film on the inner wall surface of the hail has already been developed.

An outline of this rehabilitation method will be described with reference to FIGS.

In the figure, reference numerals 21 and 22 are manholes, and reference numeral 23 is a tube which requires rehabilitation and is formed of a fume tube, a ceramic tube, a cast iron tube or the like.

First, as shown in FIG. 7, a hose introduction side device 24 is installed in one manhole 21, and a guide pipe 25 as an outlet side device is installed in the other manhole 22.
Is provided.

Next, an uncured flexible hose 26 containing a photo-curable resin is sent out from the outlet 24a of the introduction side device 24 by compressed air, and is turned over from one end 23b of the pipe 23 to the other end 23c. And is stretched by being pressed against the inner wall surface 23a, and further, as shown in FIG.
Reach 5a. At the tip 26a of the hose 26, the pressure of the compressed air acting on the inner wall surface 23a of the pipe 23 and the heat generated from the ultraviolet ray irradiator 28, which will be described later, are appropriately adjusted, so that the air is discharged to the outside. Bobbin 27
Is attached to the bobbin 27, and an ultraviolet irradiation device 28 is attached to the bobbin 27.
A rope 29 is inserted as a pulling means for introducing the.

Next, as shown in FIG. 9, after the flexible hose 26 is stretched around the inner wall surface 23a of the pipe stub 23, the rope 29 is wound up by the pulling device 30 and connected to the rope 29. 28 through the introduction side device 24
3 from one end 23b toward the other end 23c. While moving the ultraviolet irradiation device 28 from the one end 23b to the other end 23c of the tube 23, the hose 26 stretched on the inner wall surface 23a of the tube 23 is cured by the ultraviolet rays emitted from the ultraviolet irradiation device 28. Let

Further, the compressed air is continuously supplied into the hose 26 in order to avoid the thermal influence exerted on the hose 26 and further for cooling the ultraviolet irradiation device 28, and the air flow A
The compressed air thus supplied is discharged from the bobbin 27 to the outside.

After the hose 26 is hardened, both ends of the hose 26 are cut to cut off the portions protruding into the manholes 21 and 22, and the ultraviolet irradiation device 28, the introduction side device 24, the guide pipe 25, the traction device 30 and the like are removed. To do.

[0011]

According to the conventional method for rehabilitating existing pipes, the resin impermeable film is formed on the inner wall surface of the pipes, resulting in a thin pipe due to corrosion or the like. Even if a pipe or a pipe with a crack is generated, a significant improvement in strength can be obtained, and intrusion of groundwater into the pipe through the crack and leakage of water from the pipe can be prevented. However, in this rehabilitation method, while supplying compressed air into the flexible hose containing the photo-curable resin stretched on the inner wall surface of the pipe, the ultraviolet irradiation is performed in the same direction as the air flow by the supply of compressed air. Since the UV irradiation is performed while moving the device, the heat generated from the UV irradiation device prior to UV irradiation affects the part of the hose located downstream of the UV irradiation device, and then the hose is cured by UV irradiation. As a result, there is unevenness in curing, the inner peripheral surface of the hose is not formed smoothly, unevenness and wrinkles occur, increase in frictional resistance to the fluid flowing in the pipe canister, and smooth flow is obstructed. There is.

Therefore, an object of the present invention is that the inner peripheral surface of the hose arranged in the pipe can be smooth and the frictional resistance in the flow in the pipe can be reduced, which may lead to a decrease in the flow-down capability. It is to provide a rehabilitation method for existing pipes.

[0013]

The method for rehabilitating an existing pipe according to the present invention, which achieves the above-mentioned object, includes a flexible hose containing an uncured photocurable resin introduced into the existing pipe. Pressurized air is supplied from one end of the can to press the hose against the inner wall surface of the pipe, while generating an air flow from one end of the can to the other end of the hose. The flexible hose is irradiated with ultraviolet rays while moving the device in the direction opposite to the air flow to cure the flexible hose.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for rehabilitating an existing pipe according to the present invention will be described below with reference to FIGS.

In the drawings, reference numerals 1 and 2 are manholes, reference numeral 3 is an existing pipe which is formed of a fume pipe, a ceramic pipe or the like and is buried in the ground to be rehabilitated, and a reference numeral 4 is an adjacent pipe pipe. It is a water stopcock that prevents running water from flowing.

At the time of construction, the inner wall surface 3a of the pipe 3 is washed with a pipe cleaning car or the like, and if necessary, this inner wall surface 3
The shape of "a" is trimmed by shaving with a drilling machine or the like.

Next, as shown in FIG. 1, one manhole 1
A flexible hose introduction side device 5 is attached via a manhole support 6, and a guide pipe 7 as an outlet side device is attached to the other manhole 2. The guide pipe 7 has a diameter corresponding to the diameter of the pipe 3.

Subsequently, as shown in FIG. 2, the flexible hose 8 containing the photo-curable resin in an uncured state is sequentially reversed from the outlet portion 5a of the introduction side device 5 by compressed air supplied from the introduction side device 5. While being expanded, the pipe 3 is stretched from one end 3b of the pipe 3 toward the other end 3c of the inner wall 3a of the pipe 3 and is further extended.
The guide pipe 7 is brought to the upper end 7a as shown in FIG. A bobbin 9 is provided at the tip 8a of the hose 8 for discharging the compressed air supplied into the hose 8 to the outside and forming an air flow in the direction of arrow A. A rope 11 for pulling an ultraviolet irradiation device 10 described later is further inserted through the bobbin 9.

Next, as shown in FIG. 4, the guide pipe 7
The rope 11 is pulled by the pulling device 13 provided above the pipe 11, and the ultraviolet irradiation device 10 connected to the rope 11 is passed through the inside of the introduction side device 5 from one end 3b of the pipe 3 to the pipe 3 as shown in FIG. The other end of 3 is introduced up to 3c.

Subsequently, the ultraviolet irradiation device 10 is operated while the ultraviolet irradiation device 10 is at the other end 3c of the tube 3 shown in FIG. 5, and the ultraviolet irradiation device 10 is operated by the traction device 14 provided in the introduction side device 5. The rope 12 connected to the introduction side device 5 side is wound up, and the ultraviolet irradiation device 10 is moved from the other end 3c side of the tube 3 to the one end 3b side, that is, the direction B opposite to the air flow A, as shown in FIG. The flexible hose 8 is cured by moving it while moving it, and after the hose 8 is cured, both ends of the hose 8 are cut and the portions projecting into the manholes 1 and 2 are cut off to introduce the introducing device 5 and the guide pipe 7. , The other devices are removed, and the rehabilitation of the pipe 3 is completed.

According to the embodiment described above, the pipe 3
Since the flexible hose 8 containing the photocurable resin is irradiated with ultraviolet rays and cured by the ultraviolet ray irradiation device 10 that moves in the direction B opposite to the air flow A by the compressed air supplied into the hose 8 by the ultraviolet ray irradiation. Since the hose 8 is prevented from being thermally affected by the heat generated by the ultraviolet irradiation device 10 before the curing, the cured hose 8 having a uniform and smooth inner peripheral surface without unevenness flows in the pipe casing 3 accordingly. The frictional resistance to the fluid can be reduced, and a pipe with high downflow capability can be obtained.

The photo-curable resin forming the hose is
For example, it is a photocurable polyester resin, and has a property that after being cured by irradiation with ultraviolet rays, it does not react even when heat generated by an ultraviolet irradiation device or the like acts and the cured state is maintained.

In the above description, compressed air is supplied from one end of the pipe to inflate the hose containing the photo-curable resin in the uncured state while inflating it so as to stretch it on the inner wall surface of the pipe to establish an air flow. We have described the method of rehabilitating the existing hose, which cures the flexible hose by irradiating it with ultraviolet rays while moving the ultraviolet irradiator in the opposite direction. Introduced into the vessel, supply compressed air from one end of the vessel, expand the hose and press it against the inner wall surface of the vessel, and generate air flow from one end of the vessel to the other end, It is also possible to apply to another existing pipe rehabilitation method such as irradiating ultraviolet rays while moving the ultraviolet irradiation device arranged inside in the direction opposite to this air flow to cure the flexible hose. ..

[0024]

According to the above-described method for rehabilitating an existing pipe according to the present invention, the ultraviolet irradiation device is moved in the direction opposite to the flow of compressed air for pressing the hose containing the photocurable resin on the inner wall surface of the pipe. By irradiating the hose with ultraviolet rays while hardening the hose, it is avoided that the hose is thermally affected by the heat generated by the ultraviolet irradiation device before it is cured by the ultraviolet irradiation, and it is avoided by the ultraviolet irradiation. The inner surface of the pipe can be secured with a smooth hose, and the frictional resistance in the downflow of the pipe can be reduced. Therefore, it is possible to rehabilitate the high quality existing pipe with high downflow capability.

[Brief description of drawings]

FIG. 1 is a view for explaining an embodiment of an existing pipe rehabilitation method according to the present invention step by step.
It is attachment explanatory drawing of a flexible hose introduction side apparatus and an outlet side apparatus.

FIG. 2 is a diagram for explaining a process of introducing the flexible hose into the pipe casing.

FIG. 3 is a diagram for explaining a process of introducing the flexible hose into the pipe casing.

FIG. 4 is a diagram for explaining the step of introducing the ultraviolet irradiation device into the tube casing.

FIG. 5 is a diagram for explaining the step of introducing the ultraviolet irradiation device into the tube casing.

FIG. 6 is a diagram for explaining a step of similarly curing the flexible hose in the tube by an ultraviolet irradiation device.

FIG. 7 is a view for sequentially explaining a conventional method for rehabilitating an existing pipe shovel, and this figure is a view for explaining a process of introducing a flexible hose into the pipe shovel.

FIG. 8 is a diagram for explaining a process of introducing the flexible hose into the pipe casing.

FIG. 9 is a diagram for explaining a step of curing the flexible hose in the pipe casing by using an ultraviolet irradiation device.

[Explanation of symbols]

 3 Existing pipes 3a Inner wall surface 3b One end 3c Other end 8 Flexible hose 10 Ultraviolet irradiation device A Air flow

Claims (3)

[Claims] 1. Compressed air is supplied from one end of a pipe into a flexible hose containing an uncured photocurable resin introduced into an existing pipe to press the hose against the inner wall surface of the pipe. At the same time, generate an air flow from one end of the pipe to the other end,
An ultraviolet ray irradiating device arranged in the hose is irradiated in the opposite direction to the air flow while irradiating the flexible hose with ultraviolet rays to cure the flexible hose. .. 2. A flexible hose in an uncured state containing a photocurable resin in an existing pipe sill buried in the ground is expanded by inverting compressed air supplied from one end of the pipe swelling. While pressing against the inner wall surface of the pipe, generate an air flow from one end of the pipe to the other end, and move the ultraviolet irradiation device installed in the hose in the opposite direction to this air flow to generate ultraviolet light. A method for rehabilitating existing pipes, which is characterized by irradiating the flexible hose with light. 3. A flexible hose containing a photocurable resin is introduced into an existing pipe sill buried in the ground in an uncured state, and compressed air is supplied from one end of the pipe swell to expand the hose. While pressing the inner wall surface of the tube to generate an air flow from one end of the tube to the other end, while moving the ultraviolet irradiation device arranged in the hose in the direction opposite to this air flow. A method of rehabilitating existing pipes, characterized by irradiating ultraviolet rays to cure the flexible hose.