JP2656691B2 - Rehabilitation of existing pipes - 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 rehabilitating existing pipes such as water pipes and sewage pipes already installed.

[0002]

2. Description of the Related Art In general, fume pipes, ceramic pipes, cast iron pipes and the like are widely used as water pipes and sewage pipes buried underground. The inner peripheral surface of these pipes is eroded and deteriorated by hydrogen sulfide and other corrosive gases and deposits, etc., due to long-term use, the pipe thickness becomes thinner, and the strength decreases. In addition, seams between pipe pipes may shift due to ground pressure or land subsidence, etc., resulting in gaps, or cracks may occur in part of pipe pipes due to earth load, etc. , Or running water flowing through the pipe can leak into the ground. There is a possibility that the earth and sand around the pipe spills out due to the infiltration of the groundwater and the like into the pipe spill or water leakage, and a cavity is formed on the back of the pipe skewer, which may cause a road surface collapse.

[0003] As a countermeasure, for example, an uncured flexible hose containing a photo-curable resin is introduced into an existing pipe such as a sewer pipe while being inverted with compressed air, and pressed along the inner wall of the pipe. After that, a rehabilitation method of an existing pipe has been already developed in which the flexible hose is irradiated with an ultraviolet irradiation device to cure the flexible hose and form an impermeable film on the inner wall surface of the pipe.

The outline of the rehabilitation method will be described with reference to FIGS.

In the drawings, reference numerals 21 and 22 denote manholes, and reference numeral 23 denotes a pipe requiring a rehabilitation, such as a fume pipe, a ceramic pipe, a cast iron pipe, or the like.

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

Next, an uncured flexible hose 26 containing a photocurable resin is sent out from the outlet 24a of the inlet side device 24 by compressed air, and is turned from one end 23b of the tube 23 to the other end 23c. While being pressed against the inner wall surface 23a, the upper end 2 of the guide pipe 25 is further extended as shown in FIG.
Reaches 5a. The tip 26a of the hose 26 has a function of discharging air to the outside in order to appropriately adjust the pressure of compressed air acting on the inner wall surface 23a of the pipe 23 and the heat generated from the ultraviolet irradiation device 28 described later. Bobbin 27
Is attached, and the bobbin 27 has an ultraviolet irradiation device 28.
A rope 29 as a traction means for introducing the rope is inserted.

Next, as shown in FIG. 9, after the flexible hose 26 is stretched on the inner wall surface 23a of the pipe 23, the rope 29 is wound up by the pulling device 30, and the ultraviolet irradiation device connected to the rope 29 is used. 28 through the introduction side device 24 to the pipe 2
3 is moved from one end 23b to the other end 23c. While moving the ultraviolet irradiation device 28 from one end 23b of the tube 23 to the other end 23c, the ultraviolet light emitted from the ultraviolet irradiation device 28 cures the hose 26 stretched on the inner wall surface 23a of the tube 23. Let it.

The compressed air is constantly supplied into the hose 26 to avoid the thermal effects generated in the hose 26 and further cools the ultraviolet irradiation device 28, and the compressed air A
And the supplied compressed air is discharged from the bobbin 27 to the outside.

After the hardening of the hose 26, 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. I do.

[0011]

According to the conventional rehabilitation method of the existing pipe, the water impervious film made of resin is formed on the inner wall of the pipe, so that the pipe thickness is reduced due to corrosion or the like. Significant improvement in strength can be obtained even for pipes and cracks that have occurred, and infiltration of groundwater into the pipes through the cracks and leakage from the pipes can be prevented. However, in this rehabilitation method, the compressed air is supplied to the flexible hose containing the photocurable resin stretched on the inner wall of the pipe, and the ultraviolet light is irradiated in the same direction as the air flow by the supply of the compressed air. Since ultraviolet rays are irradiated while moving the apparatus, heat generated from the ultraviolet irradiation apparatus prior to the ultraviolet irradiation affects the portion of the hose located downstream of the ultraviolet irradiation apparatus, and then the hose is cured by the ultraviolet irradiation. As a result, uneven curing may occur, the inner peripheral surface of the hose may not be formed smoothly, and irregularities and wrinkles may occur, causing an increase in frictional resistance to the fluid flowing through the tube, and impeding smooth flow. There is.

Accordingly, it is an object of the present invention to reduce the frictional resistance of the hose disposed in the pipe, the inner peripheral surface of the hose being smooth and the flow in the pipe, and the possibility of lowering the flow-down ability. To provide a rehabilitation method for existing pipes.

[0013]

According to the present invention, there is provided a method for rehabilitating an existing pipe tub which achieves the above-mentioned object. At the same time, compressed air is supplied from one end of the pipe to press the hose against the inner wall of the pipe, and an air flow is generated from one end of the pipe to the other end, so that the ultraviolet light placed in the hose is irradiated. The flexible hose is cured by irradiating ultraviolet rays to the flexible hose while moving the apparatus in the direction opposite to the air flow.

[0014]

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

In the figures, reference numerals 1 and 2 denote manholes, reference numeral 3 denotes an existing pipe which is formed of a fume pipe, a ceramic pipe or the like and is buried in the ground where rehabilitation is to be performed, and reference numeral 4 denotes an adjacent pipe. This is a water stopcock that prevents water from flowing from the ground.

At the time of construction, the inner wall surface 3a of the pipe 3 is cleaned by a pipe washing machine or the like.
a is shaved by a drilling machine or the like to adjust the shape.

Next, as shown in FIG.
Then, a flexible hose introduction side device 5 is mounted via a manhole support 6, and a guide pipe 7 as an outlet side device is mounted on 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 hoses 8 containing the uncured photocurable resin from the outlet portion 5a of the introduction side device 5 are sequentially inverted by compressed air supplied from the introduction side device 5. While extending from one end 3b of the pipe 3 to the other end 3c on the inner wall 3a of the pipe 3 and further expanding it as shown in FIG.
As shown in FIG. In addition, a bobbin 9 that discharges compressed air supplied into the hose 8 to the outside and forms an airflow in the direction of arrow A is provided at the distal end 8a of the hose 8. The bobbin 9 is further provided with a rope 11 for pulling an ultraviolet irradiation device 10 described later.

Next, as shown in FIG.
The rope 11 is towed by a towing device 13 provided above, and the ultraviolet irradiation device 10 connected to the rope 11 is passed through the introduction side device 5 from one end 3b of the tube 3 as shown in FIG. 3 to the other end 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. The rope 12 connected to the introduction side device 5 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, in the direction B opposite to the air flow A as shown in FIG. The flexible hose 8 is hardened by irradiating ultraviolet rays while moving, and after hardening of the hose 8, both ends of the hose 8 are cut to cut off portions protruding into the manholes 1, 2. Then, the other devices are removed and the rehabilitation of the pipe 3 is completed.

According to the embodiment described above, the pipe 3
The flexible hose 8 containing the photocurable resin is irradiated with ultraviolet light to be cured by the ultraviolet irradiation device 10 moving in the opposite direction B to the air flow A by the compressed air supplied into the inside. 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 3. A reduction in frictional resistance to the fluid is obtained, and a pipe with high downflow ability is obtained.

The photo-curable resin forming the hose is as follows:
For example, it is a photocurable polyester resin, and after being cured by ultraviolet irradiation, has a property of maintaining a cured state without reacting even when heat generated by an ultraviolet irradiation device or the like acts.

In the above description, compressed air is supplied from one end of the pipe, the hose containing the uncured photo-curable resin is expanded while being inverted, and stretched on the inner wall of the pipe, thereby forming an air flow. The rehabilitation method for the existing pipes, which cures the flexible hose by irradiating ultraviolet rays while moving the ultraviolet irradiation device in the opposite direction, has been described. Compressed air is supplied from one end of the pipe, the hose is expanded and pressed against the inner wall of the pipe, and an air flow is generated from one end of the pipe to the other end. It can be applied to other existing pipe rehabilitation methods, such as irradiating ultraviolet rays while moving the ultraviolet irradiation device disposed in the air flow in the opposite direction to this air flow, and curing the flexible hose. .

[0024]

According to the rehabilitation method of the existing pipe hood as described above, the ultraviolet irradiation device is moved in the direction opposite to the flow of the compressed air pressing the hose containing the photocurable resin on the inner wall of the pipe hood. By irradiating the hose with ultraviolet light to cure the flexible hose, the hose is thermally affected by the heat generated by the ultraviolet irradiation device before being cured by the ultraviolet irradiation. The inner peripheral surface can be secured by the smooth hose, and the frictional resistance under the flow in the pipe can be reduced, and thus the rehabilitation of the high quality existing pipe with high flow ability can be obtained.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining an embodiment of a method for rehabilitating an existing pipe sluice according to the present invention in the order of steps.
It is attachment explanatory drawing of a flexible hose introduction side apparatus and an outlet side apparatus.

FIG. 2 is a view for explaining a step of introducing a flexible hose into a pipe.

FIG. 3 is a view for explaining a step of introducing a flexible hose into a pipe.

FIG. 4 is a view for explaining a step of introducing an ultraviolet irradiation device into a duct;

FIG. 5 is also a view for explaining a step of introducing an ultraviolet irradiation device into a duct.

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

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

FIG. 8 is a view for explaining a step of introducing a flexible hose into the pipe.

FIG. 9 is a view for explaining a step of similarly curing a flexible hose in a tube by an ultraviolet irradiation device.

[Explanation of symbols]

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

Claims (3)

(57) [Claims] 1. A pressurized air is supplied from one end of a tube to a flexible hose containing an uncured photocurable resin introduced into an existing tube, and the hose is pressed against the inner wall of the tube. At the same time, an air flow is generated from one end of the pipe to the other end,
A method for rehabilitating an existing pipework, comprising irradiating ultraviolet rays to a flexible hose and curing the flexible hose while moving an ultraviolet irradiation device arranged in the hose in a direction opposite to the air flow. . 2. An uncured flexible hose containing a photocurable resin in an existing pipe buried underground is compressed and expanded by supplying compressed air from one end of the pipe. While being pressed against the inner wall of the pipe, an air flow is generated from one end of the pipe to the other end, and the ultraviolet irradiation device arranged in the hose is moved in the opposite direction to the air flow to emit the ultraviolet light. Irradiating the flexible hose to cure the existing hose. 3. A flexible hose containing a photocurable resin is introduced into an existing pipe buried underground in an uncured state, and compressed air is supplied from one end of the pipe to expand the hose. While pressing against the inner wall of the pipe, generating an air flow from one end of the pipe to the other end, while moving the ultraviolet irradiation device arranged in the hose in the opposite direction to this air flow A method for rehabilitating existing pipes, which comprises irradiating ultraviolet rays to cure the flexible hose.