JPH08158465A - Rehabilitation method for existing pipe - Google Patents

Abstract

(57) [Summary] [Purpose] An existing facility that has a smooth inner peripheral surface, reduces frictional resistance in the downflow of the pipe, has excellent downflow capability, and provides a high-quality rehabilitated pipe with high strength. Providing a rehabilitation method for pipes. [Structure] A flexible hose 8 containing curable resin such as photocurable resin is pressed and stretched on the inner peripheral surface of the pipe 3 by supplying compressed air into the existing pipe 3 and is provided on the ultraviolet irradiation device 10. The air blower 10c agitates the air in the flexible hose 8 so as to equalize the thermal influence acting on the flexible hose 8 and to make the progress of the curing reaction uniform so that the ultraviolet irradiation device 10 can bend the flexible hose. Harden 8.

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 conduits such as water pipes and sewer pipes buried in the ground. The inner wall surfaces of these pipes are corroded by hydrogen sulfide and other corrosive gases and deposits and deteriorated 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 the pipes may be displaced and a gap may be created, or a crack may occur in a part of the pipe due to overloading, and groundwater etc. may enter the pipe from this part. Alternatively, water flowing in the pipe may leak into the ground. Due to the infiltration or leakage of such groundwater into the pipe, the sediment around the pipe may flow out to form a cavity on the back of the pipe and induce a road surface depression.

As a countermeasure against this, for example, an uncured flexible hose containing a photocurable resin, a thermosetting resin or a thermoplastic resin is introduced into an existing pipe ditch such as a sewer pipe while being inverted by compressed air, or It is introduced by pulling in and pressed along the inner wall of the pipe, and then the flexible hose is irradiated with an ultraviolet irradiation device to cure the flexible hose and form a water impermeable film on the inner wall of the pipe. The construction method has already been developed.

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

Reference numerals 21 and 22 in the figure are manholes,
Reference numeral 23 is an existing pipe ditch that requires rehabilitation and is formed of a fume pipe, a ceramic pipe, a cast iron pipe, or the like.

First, as shown in FIG. 10, 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 photocurable resin, a thermosetting resin or a thermoplastic resin is sent out by compressed air from the outlet 24a of the introduction-side device 24, and one end 23b of the pipe 23. From the end to the other end 23c while being pushed and stretched by the inner wall surface 23a, and reaches the upper end 25a of the guide pipe 25 as shown in FIG. The tip 26a of the flexible hose 26 has an inner wall surface 23a of the conduit 23.
A bobbin 27 having a function of discharging air to the outside in order to adjust the pressure of the compressed air acting on the bobbin 27 is attached, and the ultraviolet irradiation device 28 is pulled in the bohine 27 to introduce an ultraviolet irradiation device 28 as a curing means. Rope 29
Are connected.

Next, as shown in FIG. 12, after the flexible hose 26 is stretched around 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 28 connected to the rope 29. 2 through the introduction side device 24
3 from one end 23b to the other end 23c, and during this movement, the ultraviolet irradiation device 28 is irradiated by the ultraviolet irradiation device 28 or the rope 29 is pulled to move the ultraviolet irradiation device 28 to the conduit 2
3, the flexible hose 26 is cured by irradiation by the ultraviolet irradiation device 28 while moving the ultraviolet irradiation device 28 in the direction of the end 23b to form a water impermeable film, and the flexible hose 26 is cured. After that, both ends of the hose 26 are cut to cut off the portions protruding into the manholes 21 and 22, and the introduction side device 24, the guide pipe 25, and other devices are removed to complete the rehabilitation of the pipe 23.

As another existing pipe rehabilitation method, an uncured flexible hose containing a thermosetting resin or a thermoplastic resin is introduced into the existing pipe by reversing or retracting, and then compressed air is introduced into the pipe. The flexible hose is pressed along the wall surface, and in that state, the heated steam is discharged from a plurality of jet holes formed in the peripheral surface of the steam supply hose which is a hardening means arranged in the flexible hose. There is a method to harden the water to form an impermeable film on the inner wall surface of the pipe.

[0010]

According to the conventional method for rehabilitating the existing existing conduit, the resin conduit is formed on the inner wall surface of the conduit so that the thickness of the conduit becomes thin due to erosion or the like. Even if the pipe has cracks or cracks, the strength can be significantly improved, and it is possible to prevent the infiltration of groundwater into the pipes through the cracks and the leakage of water from the pipes. However, in this rehabilitation construction method, compressed air is constantly introduced into the flexible hose in order to avoid the thermal effect generated in the flexible hose stretched over the pipe and to cool the curing means such as the ultraviolet irradiation device. Although it is supplied to form an air flow, since this air flow is in a substantially laminar state, the heat generated from the curing means does not act uniformly over the entire inner peripheral surface of the flexible hose. , The temperature of the upper part of the flexible hose becomes higher than that of the lower part, and a temperature difference occurs during the curing work, and the progress of the curing reaction, that is, unevenness in the curing degree occurs, and the physical properties such as the shrinkage rate and mechanical properties of the flexible hose. Becomes uneven, the inner peripheral surface of the hose is not formed smoothly, unevenness and wrinkles occur, which causes an increase in frictional resistance to running water flowing in the pipe, which hinders smooth running water flow and is uniform. The strength cannot be obtained, resulting in a decrease in strength, which may cause damage due to external stress. That. These are more conspicuous when the flexible hose is locally cooled by groundwater or the like that enters from cracks in the existing conduit.

Therefore, it is an object of the present invention to ensure that the hose arranged in the pipe has uniform physical properties and the inner peripheral surface is smooth so that the frictional resistance and the strength of the hose can be reduced. The object is to provide a method for rehabilitating an existing sewer to obtain a high quality rehabilitate sewer.

[0012]

A method for rehabilitating an existing pipe according to the present invention to achieve the above object is to introduce an uncured flexible hose containing a curable resin into the existing pipe and to use a flexible hose. The flexible hose is hardened by the curing means arranged in the flexible hose while the flexible hose is pressed against the inner wall surface of the existing pipe by the compressed air supplied into the existing hose to form the impermeable film in the existing hose. In the method of rehabilitating an existing pipe to be formed, the air inside the flexible hose is agitated during the hardening operation of the flexible hose.

[0013]

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

In the figure, reference numerals 1 and 2 are manholes, reference numeral 3 is an existing conduit 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 running water from an adjacent conduit. It is a water stopcock that prevents the like.

At the time of construction, the inner wall surface 3a of the pipe 3 is cleaned by a pipe cleaning car, etc., and if necessary, the inner wall surface 3a is ground by a hole drilling machine or the like to adjust the shape.

Next, as shown in FIG. 1, one manhole 1
A flexible hose introduction side device 5 is attached to the above through 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, a flexible hose 8 containing a curable resin such as an uncured photocurable resin, a thermosetting resin, or a thermoplastic resin from the outlet 5a of the introduction side device 5.
Is sent out by compressed air supplied from the introduction side device 5, and is expanded while being sequentially reversed so that one end 3b of the pipe 3
To the other end 3c from the inner wall surface 3a of the pipe 3 to the upper end 7a of the guide pipe 7 as shown in FIG. A bobbin 9 for discharging the compressed air supplied into the flexible hose 8 to the outside is provided at the tip 8a of the flexible hose 8. The bobbin 9 is further inserted with a rope 11 for pulling an ultraviolet irradiation device 10, which is a curing means described later.

Next, as shown in FIG. 4, the guide pipe 7
5, a traction device 13 is provided above the rope 11, and the rope 11 is towed by the traction device 13. The ultraviolet irradiation device 10 connected to the rope 11 is introduced through the inside of the introduction side device 5 to the one end 3b of the pipe 3 as shown in FIG. The ultraviolet irradiation device 10 is operated while the ultraviolet irradiation device 10 is at the one end 3b of the pipe 3 and is moved to the other end 3c side, or the other end 3 of the pipe 3 in advance.
c until the ultraviolet irradiation device 10 has the other end 3c of the conduit 3
The ultraviolet irradiating device 10 is operated in the state of the above, and the rope 12 connected to the introducing device 5 side of the ultraviolet irradiating device 10 by the pulling device (not shown) provided in the introducing device 5.
Is wound up, and ultraviolet rays are irradiated while moving the ultraviolet irradiation device 10 from the other end 3c side of the pipe 3 to the one end 3b side to cure the flexible hose 8.

The ultraviolet ray irradiating device 10 for irradiating the flexible hose 3 with ultraviolet rays is as shown in FIG.
A plurality of ultraviolet irradiation lamps 1 swingably connected to each other
0a, a plurality of suspension devices 10b that movably support the connected ultraviolet lamps 10a, and a suspension device 10b.
A blower device 10c that is attached to the flexible hose 8a and operates in conjunction with the operation of the ultraviolet lamp 10a. The temperature of the flexible hose 8 that is being cured by stirring the air in the flexible hose 8 by the blower device 10c. Is made uniform and the progress of the curing reaction is made uniform. After the flexible hose 8 hardens, both ends thereof are cut to cut the manholes 1 and 2
The portion protruding inward is cut off, and the introduction side device 5, the guide pipe 7, the ultraviolet irradiation device 10, and other devices are removed to complete the rehabilitation of the pipe 3.

In the above embodiment, the air in the flexible hose 8 is agitated by the air blower 10c provided in the suspension device 10b of the ultraviolet irradiation device 10 so that the temperature acting on the flexible hose 8 during the curing operation is made uniform. As shown in FIG. 7, one end of the compressed air supply hose 10d is attached to the ultraviolet irradiation device 10 in place of the blower 10c, and compressed air supplied from the outside is opened to the compressed air supply hose 10d. The flexible hose 8 is being cured by stirring the air in the flexible hose 8 by the compressed air that is ejected from the ejection port 10e and is ejected.
It is also possible to make the temperature acting on the flexible hose 8 uniform, and it is also possible to stir the air in the flexible hose 8 by other appropriate means to make the temperature acting on the flexible hose 8 uniform during the curing operation. It is possible.

Next, another embodiment of the method for rehabilitating an existing pipe according to the present invention will be described with reference to FIGS.

In the figure, reference numeral 3 is an existing pipe ditch which is buried in the ground to be rehabilitated and is composed of a fume pipe, a ceramic pipe and the like.

At the time of construction, the inner wall surface 3a of the pipe 3 is cleaned, and if necessary, the shape thereof is adjusted by a boring machine or the like, and a curable resin such as a thermosetting resin or a thermoplastic resin is included from one manhole side. A flexible hose 11 is inserted, expanded by compressed air, stretched on the inner wall surface 3a of the pipe 3, and pulled by a rope 13 inserted through a bobbin 12 provided at the tip of the flexible hose 11 to serve as curing means. The supply hose 14 is shown in FIG.
Introduce as shown in.

Then, heating steam that is pressure-fed from a steam supply device (not shown) is ejected from a large number of ejection ports 15 that are open around the steam supply hose 14, and the flexible hose 11 is hardened by the heating steam. Obtain a water permeable membrane.

A large number of ejection ports 15 formed in the steam supply hose 14 are formed in a spiral shape inclined with respect to the radial direction, as shown in FIG.
Alternatively, the steam in the flexible hose 11 which is formed in multiple directions is agitated to agitate the air in the flexible hose 11 to eliminate the temperature difference acting on the flexible hose 11 during the curing operation, and to make the progress of the curing reaction uniform. It is configured to achieve Then, after the flexible hose 11 is cured, both ends thereof are cut to cut out a portion projecting into the manhole, and each rehabilitation device is removed to complete the rehabilitation of the pipe 3.

In the above description, the air in the flexible hose 11 is agitated by the heated steam jetted from the jet port 15. However, together with the steam supply hose 14, a blower device (not shown) or compressed air supply is provided as in the above embodiment. A hose (not shown) is introduced into the flexible hose 11 and the air in the flexible hose 11 is agitated by compressed air ejected from a blower or a compressed air supply hose to act on the flexible hose 11 during curing work. It is also possible to make the temperature uniform.

According to each of the embodiments described above, since the air in the flexible hose during the curing operation is agitated and the temperature acting on the flexible hose is made uniform, the curing reaction of the flexible hose progresses. The uniformity of the degree of curing is uniform, the physical properties such as shrinkage and mechanical properties are uniform, and the inner peripheral surface of the hose is formed smoothly. Therefore, the frictional resistance to the running water flowing in the pipe is reduced, a smooth flow can be secured, and the strength can be made uniform. In addition, since the air in the flexible hose is agitated, local overheating, that is, overheating, is prevented, and even if the flexible hose is locally cooled by groundwater etc. due to cracks in the pipe, etc. It is possible to obtain a high-strength and high-quality rehabilitating pipe by preventing the delay of effective curing, homogenizing the physical properties.

[0028]

As described above, according to the method for rehabilitating the existing pipe under the present invention, the air in the flexible hose is agitated during the curing operation for curing the flexible hose by the curing means.
The temperature that acts on the flexible hose can be made uniform, the curing reaction can be made uniform, and a smooth inner peripheral surface of the hose can be secured, improving the downflow capacity by reducing the frictional resistance in the downflow and the rehabilitation pipe It is possible to rehabilitate existing pipes with high quality such as high strength.

[Brief description of drawings]

FIG. 1 is a view for sequentially explaining an embodiment of a method for rehabilitating an existing pipe according to the present invention, which is an explanatory view showing attachment of a flexible hose introduction side device and an outlet side device.

FIG. 2 is likewise an explanatory view showing introduction of a flexible hose into a pipe.

FIG. 3 is likewise an explanatory view showing the introduction of the flexible hose into the pipe.

FIG. 4 is likewise an explanatory view showing the introduction of an ultraviolet irradiation device that is a curing means into the pipe.

FIG. 5 is an explanatory view showing a curing operation of a flexible hose in a pipe using an ultraviolet irradiation device.

6 is an enlarged explanatory view of a portion A in FIG.

FIG. 7 is an explanatory view showing a main part of another embodiment of the method for rehabilitating an existing pipe according to the present invention.

FIG. 8 is an explanatory view showing still another embodiment of the method for rehabilitating an existing pipe according to the present invention.

9 is a sectional view taken along line BB in FIG.

FIG. 10 is a step-by-step description of a conventional method for rehabilitating an existing conduit, which is an explanatory view showing the introduction of a flexible hose into the conduit.

FIG. 11 is likewise an explanatory view showing the introduction of the flexible hose into the pipe.

FIG. 12 is also an explanatory view showing a curing operation of a flexible hose in a pipe using an ultraviolet irradiation device.

[Explanation of symbols]

 3 Existing pipe 3a Inner wall surface 8 Flexible hose 10 Ultraviolet irradiation device 10c Blower 10d Compressed air supply hose 11 Flexible hose 14 Steam supply hose 15 Jet outlet

Claims (5)

[Claims] 1. An uncured flexible hose containing a curable resin is introduced into an existing pipe, and the flexible hose is pressed against the inner wall of the existing pipe by compressed air supplied into the flexible hose. In the rehabilitation method for the existing hose, in which the impermeable membrane is formed in the existing hose by hardening the hose by the hardening means arranged in the hose in the state A method for rehabilitating an existing pipe, characterized by agitating the air in the hose. 2. The method for rehabilitating an existing pipe according to claim 1, wherein the air in the flexible hose is agitated by a blower provided in the curing means. 3. The method for rehabilitating an existing conduit according to claim 1, wherein the air in the flexible hose is agitated by compressed air ejected from a compressed air supply hose having one end provided in the curing means. 4. The method of rehabilitating an existing pipe according to any one of claims 1 to 3, wherein the curing means is an ultraviolet irradiation device. 5. The hardening means is a steam supply hose having a large number of spouts for jetting heated steam to the surroundings, and the heating steam spouted from the spouts formed to be inclined with respect to the radial direction. The method for rehabilitating an existing pipe according to claim 1, wherein the air in the flexible hose is agitated.