JP2925466B2 - 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 an existing sewer such as a water pipe or a sewer pipe already installed.

[0002]

2. Description of the Related Art In general, fume pipes, porcelain pipes, cast iron pipes, and the like are widely used as water pipes and sewage pipes buried underground. The inner walls of these sewers are eroded and degraded by hydrogen sulfide and other corrosive gases and deposits due to long-term use, the pipes become thinner, and the strength decreases. Also, seams between pipes are shifted due to ground pressure or ground subsidence, etc., and gaps are formed, cracks occur in part of the pipes due to overload, etc., groundwater etc. infiltrate into the pipes from this part, Alternatively, running water or the like flowing in the sewer may leak into the ground. There is a possibility that earth and sand around the sewer flow out due to infiltration or leakage of the groundwater into the sewer and a cavity is formed on the back of the sewer, thereby causing road surface depression.

[0003] As a countermeasure, for example, an uncured flexible hose containing a photocurable resin, a thermosetting resin, or a thermoplastic resin is introduced into an existing sewer such as a sewer while being inverted with compressed air, or Introduce by pulling in, press along the inner wall of the sewer, and then irradiate the flexible hose with an ultraviolet irradiation device to cure the flexible hose and form an impermeable membrane on the inner wall of the sewer. Construction methods have already been developed.

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

[0005] Reference numerals 21 and 22 denote manholes,
Reference numeral 23 denotes an existing sewer which 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 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 photo-curable resin, a thermo-curable resin or a thermoplastic resin is sent out from the outlet 24a of the introduction-side device 24 by compressed air, and the one end 23b of the sewer 23 is compressed. Then, it is pressed and stretched against the inner wall surface 23a while being turned toward the other end 23c, 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
A bobbin 27 is mounted to perform a function of discharging air to the outside in order to adjust the pressure of the compressed air acting on the bobbin. Rope 29
Are connected.

[0010] Next, as shown in FIG. 12, after a flexible hose 26 is stretched on the inner wall surface 23 a of the sewer 23, the rope 29 is taken up by a traction device 30, and an ultraviolet irradiation device 28 connected to the rope 29. Through the introduction side device 24 to the sewer 2
3 is moved from one end 23b to the other end 23c, and during this movement, the ultraviolet irradiation device 28 is moved by the irradiation from the ultraviolet irradiation device 28 or by pulling the rope 29.
3, the flexible hose 26 is cured by irradiation with the ultraviolet irradiation device 28 while moving the ultraviolet irradiation device 28 in the direction of the one end 23b to form an impermeable film, and the flexible hose 26 is cured. Thereafter, both ends of the hose 26 are cut to cut off 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 sewer 23.

As another method of rehabilitating an existing sewer, an uncured flexible hose containing a thermosetting resin or a thermoplastic resin is inverted or drawn into the existing sewer and then compressed by compressed air. The flexible hose is pressed by being pressed along the wall surface, and in this state, heated steam is released from a plurality of jet holes formed on the peripheral surface of the steam supply hose serving as curing means provided in the flexible hose. There is a measure to harden the water and form an impermeable film on the inner wall of the pipe.

[0010]

According to the above-mentioned conventional rehabilitation method for existing sewers, a resin impermeable film is formed on the inner wall surface of the sewer, so that the sewer has a reduced thickness due to erosion or the like. Significant improvement in strength can be obtained even in a culvert in which cracks or the like have occurred, and intrusion of groundwater into the culvert through the cracks or the like and water leakage from the culvert can be prevented. However, in this rehabilitation method, compressed air is constantly introduced into the flexible hose in order to avoid the thermal effects occurring on the flexible hose stretched over the sewer and to cool the curing means such as an ultraviolet irradiation device. Although the air flow is supplied to form the air flow, since this air flow is in a substantially laminar flow 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 operation. Becomes uneven, the inner circumferential surface of the hose is not formed smoothly, unevenness and wrinkles occur, causing an increase in frictional resistance against running water flowing in the sewer, obstructing the smooth flow of running water, and The strength may not be obtained and the strength may be reduced, which may cause damage due to external stress. That. These are more remarkable when the flexible hose is locally cooled by groundwater or the like penetrating from cracks or the like of the existing sewer.

Accordingly, it is an object of the present invention to provide a hose provided in a sewer with uniform physical properties, a smooth inner peripheral surface, and a reduction in frictional resistance and an improvement in strength under the flow in the sewer. It is an object of the present invention to provide a method of rehabilitating an existing sewer which can obtain a high quality rehabilitated sewer.

[0012]

Calibration method of the existing sewer in accordance with the invention to achieve the above object In order to achieve the above, introducing a flexible hose in the uncured state comprising a curable resin into the existing sewer, the flexible hoses
Supply compressed air from one end of the hose and discharge from the other end of the hose
While the flexible hose is pressed against the inner wall surface of the existing conduit by the compressed air supplied to the flexible hose, the flexible hose is cured by the curing means provided in the flexible hose, and In the rehabilitation method of the existing sewer which forms an impermeable membrane in the inside of the flexible hose during the hardening work of the flexible hose
The air in the flexible hose is stirred by the stirring means .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a method for rehabilitating an existing sewer 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 sewer buried in the ground to be rehabilitated, which is formed of fume pipes, ceramic pipes, etc., and reference numeral 4 denotes running water from an adjacent sewer. It is a water stopcock to prevent the like.

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

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

Subsequently, as shown in FIG. 2, a flexible hose 8 containing a curable resin such as a photocurable resin, a thermosetting resin, or a thermoplastic resin in an uncured state from an outlet 5a of the introduction-side device 5.
Is sent out by the compressed air supplied from the introduction-side device 5, and is expanded while being sequentially inverted, so that one end 3 b of the culvert 3
From the front end to the other end 3c on the inner wall surface 3a of the sewer 3, and further 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 distal end 8a of the flexible hose 8. A rope 11 is pulled through the bobbin 9 to pull an ultraviolet irradiation device 10 which is a curing means described later.

Next, as shown in FIG.
A pulling device 13 is provided above, and the rope 11 is pulled by the pulling device 13, and the ultraviolet irradiation device 10 connected to the rope 11 is introduced into the introduction side device 5 to one end 3b of the culvert 3, as shown in FIG. The ultraviolet irradiation device 10 is operated in a state where the ultraviolet irradiation device 10 is at one end 3b of the sewer 3 and is moved to the other end 3c side, or in advance, the other end 3 of the sewer 3
c, and the ultraviolet irradiation device 10 is connected to the other end 3c of the sewer 3
The ultraviolet irradiating device 10 is operated in the state described above, and the rope 12 connected to the introducing device 5 side of the ultraviolet irradiating device 10 by a traction device (not shown) provided in the introducing device 5.
The flexible hose 8 is hardened by irradiating ultraviolet rays while moving the ultraviolet irradiation device 10 from the other end 3c side of the culvert 3 to the one end 3b side.

The ultraviolet irradiation device 10 for irradiating the flexible hose 3 with ultraviolet light is shown in FIG.
A plurality of ultraviolet irradiation lamps 1 swingably connected to each other
0a, a plurality of suspension devices 10b movably supporting these connected ultraviolet lamps 10a, and a plurality of suspension devices 10b.
And a blower 10c that is mounted on the flexible hose 8 and that operates in conjunction with the operation of the ultraviolet lamp 10a. The blower 10c agitates the air in the flexible hose 8 to operate the flexible hose 8 during curing. And the degree of progress of the curing reaction is made uniform. After the flexible hose 8 has hardened, both ends thereof are cut off and the manholes 1 and 2 are cut.
The part 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 culvert 3.

In the above embodiment, the air in the flexible hose 8 is agitated by the blowing device 10c provided in the suspension device 10b of the ultraviolet irradiation device 10 so as to equalize the temperature acting on the flexible hose 8 during the hardening operation. As shown in FIG. 7, instead of the blower 10c, one end of a compressed air supply hose 10d is attached to the ultraviolet irradiation device 10 as shown in FIG. 7, and the compressed air supplied from the outside is opened to the compressed air supply hose 10d. The air in the flexible hose 8 is agitated by the compressed air spouted from the spout 10 e and the spouted compressed air is used to cure the flexible hose 8 during the hardening operation.
It is also possible to equalize the temperature acting on the flexible hose 8 by means of other suitable means and to stir the air in the flexible hose 8 during the hardening operation. It is possible.

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

Reference numeral 3 in the figure denotes an existing sewer buried in the ground to be rehabilitated, such as a fume pipe and a ceramic pipe.

At the time of construction, the inner wall surface 3a of the culvert 3 is cleaned, and if necessary, the shape is adjusted by a drilling machine or the like, and a curable resin such as a thermosetting resin or a thermoplastic resin is contained from one manhole side. A flexible hose 11 is inserted, expanded by compressed air, stretched on the inner wall surface 3a of the duct 3, and a steam 13 serving as a curing means is pulled by a rope 13 inserted through a bobbin 12 provided at the tip of the flexible hose 11. FIG. 8 shows the supply hose 14.
Introduce as shown.

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

As shown in FIG. 9 in a cross section taken along the line BB in FIG. 9, a large number of jet ports 15 formed in the steam supply hose 14 are formed in a spiral shape inclined with respect to the radial direction.
Alternatively, the air in the flexible hose 11 is agitated by the heating steam ejected from the ejection port 15 and is formed in multiple directions to eliminate a temperature difference acting on the flexible hose 11 during the curing operation, so that the degree of progress of the curing reaction is uniform. It is configured to achieve Then, after the flexible hose 11 has hardened, both ends thereof are cut to cut off a portion protruding 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 spouted from the spout 15, but together with the steam supply hose 14, an air blower (not shown) or a compressed air 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 blowing device or a compressed air supply hose to act on the flexible hose 11 during the hardening operation. It is also possible to achieve a uniform temperature.

According to each of the embodiments described above, since the air in the flexible hose during the hardening operation is agitated and the temperature acting on the flexible hose becomes uniform, the curing reaction of the flexible hose proceeds. The degree of curing is uniform, the degree of curing is not uneven, the physical properties such as shrinkage and mechanical properties are uniform, and the inner peripheral surface of the hose is formed smoothly. Therefore, frictional resistance against flowing water flowing in the sewer is reduced, a smooth flow can be secured, and a uniform strength can be secured. Further, since the air in the flexible hose is agitated, local overheating, that is, overheating, is prevented, and even when the flexible hose is locally cooled by groundwater or the like from cracks in the sewer, etc. In this way, it is possible to prevent a substantial delay in hardening, to achieve uniform physical properties, and to obtain a high-strength, high-quality rehabilitated culvert.

[0028]

According to the rehabilitation method of the existing sewer according to the present invention described above, the air in the flexible hose is agitated during the hardening operation of hardening the flexible hose by the hardening means.
The temperature acting on the flexible hose can be made uniform, the curing reaction can be made uniform, the inner surface of the hose can be kept smooth, the flow capacity can be improved by reducing the frictional resistance flowing down the pipe, and the pipe can be rehabilitated. The rehabilitation of the existing sewer with high quality, such as the high strength of the pipe, can be obtained.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view for sequentially explaining one embodiment of a method for rehabilitating an existing sewer according to the present invention, and is an explanatory view showing attachment of a flexible hose introduction side device and an outlet side device.

FIG. 2 is an explanatory view showing the introduction of a flexible hose into a sewer.

FIG. 3 is an explanatory view showing the introduction of a flexible hose into a sewer.

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

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

FIG. 6 is an enlarged explanatory view of a portion A in FIG. 5;

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

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

FIG. 9 is a sectional view taken along line BB in FIG. 8;

FIG. 10 is a view for explaining a conventional rehabilitation method of an existing sewer in order, and is an explanatory view showing introduction of a flexible hose into the sewer.

FIG. 11 is an explanatory view showing the introduction of a flexible hose into a sewer.

FIG. 12 is an explanatory view showing a curing operation of a flexible hose in a duct by an ultraviolet irradiation device.

[Explanation of symbols]

 3 Existing sewer 3a Inner wall surface 8 Flexible hose 10 UV irradiation device 10c Blower 10d Compressed air supply hose 11 Flexible hose 14 Steam supply hose 15 Spout

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 63/00-63/48 F16L 1/00 F16L 55/10-55/18

Claims (6)

(57) [Claims] An uncured flexible hose containing a curable resin is introduced into an existing sewer and compressed air is introduced from one end of the flexible hose.
While the air is supplied and discharged from the other end of the hose while the flexible hose is pressed against the inner wall of the existing sewer by the compressed air supplied to the flexible hose. In a method of repairing an existing sewer by curing a flexible hose by means to form a water-impermeable membrane in the existing sewer , the agitation means in the flexible hose during the work of hardening the flexible hose. A method for correcting an existing device, characterized by stirring air in a hose. 2. The method for rehabilitating an existing sewer according to claim 1, wherein the air in the flexible hose is agitated by a blower provided in the curing means. 3. The air in the flexible hose is introduced into the flexible hose.
Compressed air ejected from the introduced compressed air supply hose
The existing sewer according to claim 1, wherein the existing sewer is stirred.
Rehabilitation method . 4. The method for rehabilitating an existing sewer 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. 5. A curing means, rehabilitation methods of the existing sewer according to any one of claims 1-4 is an ultraviolet irradiation device. 6. A steam supply hose having a plurality of ejection ports for ejecting heated steam to the surroundings, wherein the curing means uses heated steam ejected from the ejection ports formed to be inclined with respect to a radial direction. The method according to claim 1, wherein the air in the flexible hose is agitated.