JPH05171674A - Method of reclamation construction of existing pipe drain and structure of end section of existing pipe drain - Google Patents

Abstract

PURPOSE:To maintain a positive cut-off effect for a prolonged term. CONSTITUTION:A cut-off material 8 composed of a water growing material is stretched annularly along pipe port 1c extending over a specified range from the pipe port 1c of an existing pipe drain 1, and the cut-off material 8 and the inner circumferential surface 1a of the existing pipe drain 1 are covered with an impermeable membrane 2. Even when groundwater, etc., intruding from a crack 1b are transmitted in a clearance 3 between the pipe drain 1 and the impermeable membrane 2 and reach the cut-off material 8, the cut-off material 8 arranged between the pipe drain 1 and the impermeable membrane 2 swells and completely stops water, and the cut-off material 8 is covered with the impermeable membrane 2 and the pipe drain 1. Accordingly, the cut-off material is not exposed to a corrosive gas and flowing water, etc., in the pipe drain 1, and the corrosion and deterioration of the cut-off material 8 are prevented, thus maintaining a stable cut-off function for a prolonged term.

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 pipe, such as a water pipe or a sewer pipe already installed, and an end structure of the rehabilitated pipe.

[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 is reduced. Also, due to ground pressure or ground subsidence, the seam between pipes will be displaced to create a gap, or cracks will occur in part of the pipe due to overloading, etc. Runoff or flowing water in pipes may 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 made of a photocurable plastic or a thermosetting plastic material is inserted into an existing pipe casing such as a sewer pipe while being inverted by compressed air, and is then inserted into the pipe casing. An existing pipe that is crimped along the peripheral surface and then irradiates the flexible hose with an ultraviolet lamp or heats the flexible hose to harden the flexible hose to form an impermeable film on the inner peripheral surface of the pipe. Kyo's rehabilitation method has already been developed.

According to the existing pipe rehabilitation method, a water impermeable film made of plastic is formed on the inner peripheral surface of the pipe so that the pipe becomes thinner or cracked due to corrosion or the like. Even if it is a pipe pipe, a significant improvement in strength can be obtained, and the intrusion of groundwater into the pipe pipe through the cracks and the leakage of water from the pipe pipe can be prevented.

However, as shown in the enlarged cross-sectional view of the main part in FIG. 4, the inner peripheral surface 1a of the pipe 1 is deteriorated by being corroded by hydrogen sulfide and other corrosive gases due to long-term use, and further scales, sludge, etc. When the water impermeable film 2 made of plastic or the like is attached to the inner peripheral surface 1a by pressing, the fine water is not formed between the inner peripheral surface 1a of the pipe 1 and the water impermeable film 2. Countless gaps 3 are created.

Therefore, as shown in FIG. 5, the groundwater or the like infiltrated from the crack 1b generated in the pipe 1 travels through the minute gaps 3 from the pipe opening 1c which is the end of the pipe 1 to form the pipe 1 The water leaks into the open manhole 4 etc., and a perfect water-stop effect cannot be obtained. Such a problem also occurs when the pipe is rehabilitated by another method. Therefore, A in FIG.
As shown in FIG. 6, the inner peripheral edge 1d of the pipe opening 1c of the pipe 1 is chamfered in a tapered shape, and a concave portion 5 is formed between the inner peripheral edge 1d and the impermeable membrane 2. By filling the inside of the pipe 5 with a padding 6 such as urethane resin or other bond to finish the pipe mouth 1c, the open end of the gap 3 is closed and running water from the pipe mouth 1c side is prevented.

[0007]

According to the above-mentioned existing pipe rehabilitation method, the inner peripheral surface of the pipe can is covered with a water impermeable film made of plastic or the like, and between the inner peripheral edge of the pipe mouth and the water impermeable film. Since the formed recess is filled with joints such as urethane resin, it is possible to prevent groundwater from flowing out of the pipe mouth to the manhole etc. through the gap between the pipe and the impermeable membrane. it can. However, the filling material made of urethane resin, etc., filled in the recess formed between the inner peripheral edge of the pipe mouth and the impermeable membrane, is exposed to corrosive gas and running water, etc., causing deterioration, denaturation and deterioration over time, and filling material There is a problem that it is difficult to maintain the water blocking function for a long period of time due to the occurrence of cracks in the tube and the removal of the filling from the pipe mouth.

Therefore, an object of the present invention is to provide a method for rehabilitating an existing pipe and an end structure for the existing pipe, which can ensure a reliable water stopping function for a long period of time.

[0009]

The method for rehabilitating an existing pipe and the end structure of the existing pipe according to the present invention, which achieves the above-mentioned object, are provided on at least the inner peripheral surface of the existing pipe at least near the pipe mouth. A water-stopping material made of a water-swellable material is stretched in an annular shape along the circumferential direction, and the water-stopping material and the inner peripheral surface of the existing pipe can be covered with a water impermeable film, and the existing pipe and A water-stopping material made of a water-swellable material that is arranged along the circumferential direction on the inner peripheral surface of at least the vicinity of the pipe mouth of this existing pipe, and covers the water-stopping material and the inner peripheral surface of the existing pipe. And a water impermeable membrane.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an existing pipe rehabilitation method and an existing pipe end structure according to the present invention will be described below with reference to the drawings.
For convenience of explanation, the same reference numerals are given to the parts corresponding to those in FIGS.

FIG. 1 is a schematic explanatory view showing the steps of the rehabilitation method according to this embodiment. FIG. 1 (a) is a cross-sectional view of an essential part showing a state before the rehabilitation method is applied. In the figure, reference numeral 1 is embedded in the ground 7, and a pipe mouth 1c as an end is opened in the manhole 4. There are pipes such as sewer pipes.

In order to rehabilitate the existing pipe shovel 1 in this manner, first, the inner peripheral surface 1a of the pipe shovel 1 is washed and, if necessary, surface-treated such as drilling.

Next, as shown in FIG. 1 (b), the pipe mouth 1 is formed on the inner peripheral surface 1a of the pipe 1 which has been washed and, if necessary, surface-treated.
An annular water stop material 8 along the circumferential direction over a predetermined range from c
Extend.

The water-stopping material 8 is a water-swelling material such as polyacrylate, ether polyurethane elastomer, isobutylene-malinic anhydride copolymer, Poval.
A cylindrical shape having a thickness of 3 mm or less made of a water-absorbent resin such as an acrylate copolymer or a modified starch, or a mixture of these water-absorbent resin and chloroprene rubber, natural rubber, etc. For example, it is stretched by being spread along the inner peripheral surface 1a of the pipe 1 by a pressing machine (not shown) called a packer. If necessary, an adhesive may be applied to the inner peripheral surface 1a of the pipe 1 or the outer peripheral surface of the water blocking material 8 to facilitate tensioning.

It is also possible to form the water blocking material 8 in the shape of a band having a predetermined width and to stretch the water blocking material in the circumferential direction along the inner peripheral surface 1a of the pipe 1.

Next, an uncured flexible hose made of, for example, a photocurable plastic material or a thermosetting plastic material is inserted into the pipe casing 1 by compressed air, and while being inverted, the inner peripheral surface of the pipe casing 1 is reversed. 1A by crimping along the line 1a, and then irradiating the flexible hose with a UV lamp or heating it with steam, warm water, etc. to cure it.
As shown in (c), the inner peripheral surface 1a of the pipe 1 and the waterproof material 8
Is covered with a water impermeable membrane 2.

According to the structure of the end of the existing drainage pipe such as the sewer pipe thus rehabilitated, the water stop material 8 of the water swelling material is provided on the inner circumference of the drainage pipe 1 over a predetermined range from the pipe mouth 1c. The surface 1a and the impermeable membrane 2 are sandwiched and arranged along the circumferential direction, and the water stop material 8 seals the end of the gap 3 on the side of the pipe mouth 1c, so that the crack 1b generated in the pipe 1 is inserted. Groundwater, etc. that has infiltrated from underground 7 travels through gap 3 and pipe 1 and impermeable membrane 2
Even if it reaches the water blocking material 8 disposed between the and, the ground water causes the water blocking material 8 to swell and exert a complete water blocking effect.
Further, since the water blocking material 8 is covered by the inner peripheral surface 1a of the pipe 1 and the water impermeable film 2 over almost the entire area except the end portion 8a on the pipe mouth side, it can be exposed to corrosive gas or running water. Without
Corrosion or deterioration of the water blocking material 8 is prevented and the water blocking material 8 is
A stable water stop function can be maintained for a long period of time without separating from c.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 2 (a) is the same as FIG. 1 in the above embodiment.
(A) It is an important section sectional view showing the state before performing a rehabilitation method similarly. In this way, the inner peripheral surface 1a of the pipe 1 to be rehabilitated buried in the ground 7 is cleaned and surface-treated as necessary.

Next, as shown in FIG. 2 (b), the inner peripheral surface 1a of the pipe casing 1 is drilled from the pipe mouth 1c side over the range where the water blocking material 8 made of a water swelling material is mounted. A hole is drilled (not shown) or the like to form an annular recess 1e along the circumferential direction in which at least a part of the water blocking material 8 can be accommodated.

Next, as shown in FIG. 2 (c), the annular recess 1e is formed.
A water blocking member 8 formed in a cylindrical shape along the above-mentioned embodiment
By inserting it from the tube mouth 1c side and stretching it with a pressing machine (not shown) or a band-shaped waterproofing material in the annular recess 1e formed along the circumferential direction with an adhesive as required. Set up.

Next, an uncured flexible hose made of a thermosetting plastic material is inserted into the pipe 1 by compressed air and inverted, and is crimped to the inner peripheral surface 1a of the pipe 1, and then the The flexible hose is heated and cured,
As shown in (d), the inner peripheral surface 1a of the pipe 1 and the water blocking material 8 are covered with the water impermeable film 2.

In the end structure of the existing pipe rehabilitated as described above, the water blocking material 8 made of the water-swellable material covers the pipe 1 and the impermeable membrane 2 over a predetermined range from the pipe opening 1c, as in the above embodiment. Even if there is groundwater or the like that is sandwiched by and is infiltrated from the crack 1b generated in the pipe 1 and further propagates through the gap 3, the water stop placed between the pipe 1 and the impermeable membrane 2 The material 8 swells and can completely stop water. Further, the water blocking material 8 is covered with the water impermeable membrane 2 and the pipe 1, and is protected from corrosive gas and running water, so that the water blocking material 8 is prevented from being corroded and deteriorated. It does not come off from 1c, and a stable state is maintained for a long time. Furthermore, since the water blocking material 8 is housed in the annular recess 1e formed in the pipe 1 or is partially housed, the amount of projection of the water blocking material 8 from the inner peripheral surface 1a of the pipe 1 is reduced. Therefore, the amount of protrusion of the impermeable membrane 2 inward is reduced or eliminated, and the flow of sewage or the like in the pipe 1 can be carried out more smoothly.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 3 (a) is the same as FIG. 1 in the above embodiment.
It is a principal part sectional view which shows the state before performing a rehabilitation construction method like (a) and FIG. 2 (a). Thus, the inner peripheral surface 1a of the existing pipe 1 is cleaned and surface-treated as necessary.

Next, as shown in FIG. 3 (b), one is provided along the circumferential direction on the inner peripheral surface 1a of the tube 1 near the tube 1c of the tube 1 and at a predetermined distance from the tube 1c. Alternatively, the plurality of annular recesses 1f are manually or mechanically formed.

Subsequently, as shown in FIG. 3 (c), a water blocking material 8 made of a water-swellable material formed in an annular shape is fitted in the annular concave portion 1f, and subsequently, an uncured material made of a thermosetting plastic material is uncured. By inserting and inverting the flexible hose into the pipe can 1 with compressed air, the flexible hose is pressure-bonded to the inner peripheral surface 1a of the pipe can 1, and then the flexible hose is cured by heating.
As shown in (d), the inner peripheral surface 1a of the pipe 1 and the water blocking material 8 are covered with the water impermeable film 2.

According to the end structure of the existing pipe rehabilitated as described above, a complete water shut-off function can be obtained as in the above-mentioned embodiment, and the water shut-off member 8 arranged in an annular shape is used as the pipe 1 and the impermeable water. Since it is completely covered with the film 2, it is not completely exposed to corrosive gas, running water, etc., so that more reliable corrosion and deterioration of the water blocking material 8 can be prevented, and a stable state can be maintained for a longer period of time.

In the above description, an uncured flexible hose made of a plastic material as a water impermeable film is inserted and inverted into the pipe casing by compressed air and pressure-bonded to the inner peripheral surface,
Further, although an example in which the flexible hose is heated and hardened is described, a water impermeable membrane made of other material such as glass fiber or non-woven fabric is not limited to the plastic material, and a strip-shaped non-woven film is formed on the inner peripheral surface of the pipe. It can be widely applied to other existing pipe rehabilitation methods and pipe end structures, such as using a water impermeable film formed by spirally stretching a water permeable material.

[0030]

According to the method of rehabilitating the existing pipe and the end structure of the existing pipe according to the present invention as described above, the water blocking material made of the water-swelling material is used to form the pipe and the impermeable membrane. Since it is sandwiched between them, groundwater etc. will invade from the cracks generated in the pipe swell, and even if it reaches the water stop material through the gap between the pipe stub and the impermeable membrane, this water swell will swell. The complete waterproofing effect can be ensured, and the waterproofing material is covered with the impermeable membrane and the pipe dam, so that the corrosion of the water blocking material can be prevented without being exposed to corrosive gas or running water in the pipe dam. Also, since the prevention of deterioration is ensured, it has the effect of maintaining a stable water-stop function for a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of an existing pipe rehabilitation method and an existing pipe end structure according to the present invention.

FIG. 2 is a schematic explanatory view showing another embodiment of the existing pipe rehabilitation method and pipe end structure according to the present invention.

FIG. 3 is a schematic explanatory view showing still another embodiment of the existing pipe rehabilitation method and pipe end structure according to the present invention.

FIG. 4 is a cross-sectional view of a main part of a conventional pipe shovel for explaining rehabilitation of a conventional existing pipe shovel.

FIG. 5 is a sectional view of an essential part of a conventional pipe shovel for explaining rehabilitation of a conventional existing pipe shovel.

6 is an enlarged cross-sectional view of a portion A in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 1a Inner peripheral surface 1c Pipe opening 1e Annular recess 1f Annular recess 2 Water impermeable film 3 Gap 8 Water stop material

Claims (5)

[Claims] 1. A water-stopping material and an existing pipe shell are stretched in an annular shape along the circumferential direction on an inner peripheral surface of the existing pipe shell located at least near the pipe mouth. An existing pipe rehabilitation method characterized by coating the inner surface with a water impermeable membrane. 2. An existing pipe stub, a water stop material made of a water-swellable material and arranged along the circumferential direction on an inner peripheral surface of the existing pipe stub that is located at least near the pipe mouth, and a water stop. A pipe end structure of an existing pipe characterized by having a material and a water impermeable membrane covering the inner peripheral surface of the existing pipe. 3. The existing pipe stem end structure according to claim 2, wherein the water blocking material is arranged in an annular shape along the circumferential direction over a predetermined range from the existing pipe pipe mouth. 4. At least a part of the water blocking material is accommodated in an annular recess formed in the circumferential direction along the inner peripheral surface of the existing pipe can over a predetermined range from the pipe mouth of the existing pipe. The existing pipe end structure according to claim 3. 5. The at least part of the water blocking material is accommodated in an annular recess formed along the circumferential direction on the inner peripheral surface of the existing pipe, spaced apart from the existing pipe mouth. Existing pipe end structure.