JP6619146B2 - Pipe repair structure - Google Patents

Description

  The present invention relates to a pipe repair structure such as a sewer pipe, and more particularly to a pipe repair structure provided with ground following ability.

  In order to repair existing pipes such as sewage pipes, conventionally, repair methods have been performed in which rehabilitated pipes are installed inside existing pipes. For rehabilitation pipes, a cylindrical curable lining material is introduced into the existing pipe in a folded state, and then cured with the curable lining material in close contact with the inner surface of the existing pipe, or a plurality of ready-made pipes. There is known a sheath pipe construction method in which shaped pieces are successively introduced into existing pipes one by one.

  In recent years, an intermediate tubular body such as a non-woven fabric is interposed between an existing pipe and a rehabilitated pipe in order to impart ground followability such as water-stopping to the pipeline after repair (Patent Document 1). ).

JP 2011-110856 A

  However, in the method described in Patent Document 1, after repairing, groundwater that has flowed in from breakage or cracks such as cracks in the existing pipe may flow along the intermediate tubular body between the existing pipe and the rehabilitation pipe. In this case, there is a problem that sufficient waterstop cannot be obtained. Moreover, the fiber which comprises an intermediate cylindrical body flows out with the flow of this groundwater, and the function by an intermediate cylindrical body may fall with time.

  Accordingly, an object of the present invention is to provide a pipeline repair structure capable of repairing an aged existing pipe, giving a water stop and ground followability to the pipeline, and maintaining the function for a long period of time. It is in.

In order to solve the above problem, the pipe repair structure according to claim 1 is disposed between an existing pipe, a renovated pipe installed inside the existing pipe, and the existing pipe and the renovated pipe. In the pipe repair structure having an intermediate cylindrical body containing fibers, the intermediate cylindrical body is formed of a non-woven fabric having a gap, and groundwater flowing into the existing pipe from the crack of the existing pipe, In order to suppress the flow along the intermediate cylindrical body, a suppression portion in which the thickness of the intermediate cylindrical body is smaller than other portions is provided, and the suppression portion is provided on the intermediate cylindrical body. It is characterized in that it is provided by forming a high-density portion with less voids and higher density than other portions .

  According to this configuration, because of the presence of the suppression portion, it is possible to suppress the underground water that has flowed in through the cracks of the existing pipe from flowing in the direction of the relay structure along the intermediate cylindrical body, so that a high water stoppage. An effect can be obtained, and the outflow of fibers contained in the intermediate cylindrical body can be prevented. Therefore, it is possible to maintain the water stoppage and ground followability obtained by installing the intermediate cylindrical body for a long period of time.

  According to this configuration, the formation of the high-density portion and the formation of the portion with less voids in the intermediate cylindrical body results in water-stopping, so that the effect of suppressing the flow of groundwater inside the intermediate cylindrical body can be accurately and Can be easily obtained.

The pipe line repair structure according to claim 2 , wherein the high-density portion has an annular seal between the existing pipe and the intermediate cylindrical body, or between the rehabilitated pipe and the intermediate cylindrical body. It is characterized in that it is formed by being compressed more than the other parts by providing a material.

  According to this structure, since a high-density part can be accurately formed by interposing an annular sealing material at the above-mentioned location, the flow of groundwater can be satisfactorily suppressed.

In the pipeline repair structure according to claim 3 , the existing pipe and the renovated pipe are in direct contact with the end of the existing pipe connected to the relay structure without the intermediate cylindrical body. It has a part and it has the control part compressed with the above-mentioned sealing material on the opposite side of the above-mentioned relay structure on the basis of this part.

  According to this configuration, since the flow of groundwater is blocked at the portion where the existing pipe and the rehabilitation pipe are in direct contact with each other, it is possible to prevent the outflow of the fibers of the intermediate cylindrical body accompanying the flow of groundwater.

Conduit repair structure according to claim 4, wherein the suppression unit is characterized in that from the end of which is connected to the RELAY structure the existing pipe provided within 10 cm.

  According to this configuration, after the existing pipe repair structure of the present invention is installed, even if there is a crack or crack in the existing pipe portion in the direction opposite to the existing pipe end with respect to the sealing material, Since the flow of groundwater that can flow in is finally blocked by the sealing material, the repair structure can be made thorough.

The pipe line repair structure according to claim 5 is characterized in that the intermediate cylindrical body includes a water expansion material.

  According to this configuration, when the water expansion material expands due to the inflowing groundwater, a water stoppage is obtained by reducing the voids in the intermediate cylindrical body, so that the groundwater that flows in through the cracks in the existing pipe is the intermediate cylindrical body. Can be reliably prevented from flowing along.

The pipe repair method according to claim 6 , wherein the rehabilitation pipe introduces a tubular curable lining material into the existing pipe in an uncured state, and the curable lining material passes through the intermediate cylindrical body. It is formed by curing the curable lining material in a state of being pressed against the inner surface of the existing pipe. Even in the method of forming the rehabilitated pipe by the lining method, it is possible to give the pipe a water-stopping property and ground followability by forming the above-described suppression portion, and maintain the function for a long period of time.

The pipe line repair structure according to claim 7 , wherein the rehabilitation pipe is formed by continuously introducing a plurality of ready-made new pipe pieces inside the intermediate cylindrical body. To do. Even in the method of forming a rehabilitated pipe by continuously introducing new pipe pieces, by forming the above-mentioned restraining part, the pipe line is given water-stopping and ground followability, and its function is maintained over a long period of time. be able to.

  ADVANTAGE OF THE INVENTION According to this invention, while aging the existing pipe is repaired, earthquake resistance is provided to a pipeline and the pipeline repair structure which can maintain the earthquake resistance over a long term is provided.

It is explanatory drawing of an intermediate | middle cylindrical body. It is explanatory drawing which shows the state which introduced the intermediate cylindrical body. It is explanatory drawing which shows the state which introduced the lining material. It is sectional drawing which shows the process of forming a rehabilitation pipe | tube. It is sectional drawing which shows the pipe line repair structure of this invention. It is sectional drawing which shows the other example which forms a rehabilitation pipe | tube. It is sectional drawing which shows the other example of the pipe line repair structure of this invention. It is sectional drawing which shows the other example of the pipe line repair structure of this invention. It is sectional drawing which shows the other example of the pipe line repair structure of this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of an intermediate cylindrical body used to form the repair structure of the present invention. The intermediate cylindrical body 12 is produced by, for example, forming a nonwoven fabric (for example, felt) or the like into a tubular shape, and an annular sealing material 14 is provided on each outer surface near both ends.

  The outer diameter of the intermediate cylindrical body 12 is substantially the same as the inner diameter of the existing pipe to be repaired. The outer diameter of the sealing material 14 is substantially the same as the outer diameter of the intermediate cylindrical body 12. As the sealing material 14 itself, an O-ring, a belt-shaped (strip-shaped) annular body, or the like can be used. When using an O-ring, the diameter is preferably 0.5 to 2 mm. When a belt-shaped annular body is used, the width is, for example, 20 to 100 mm, preferably 30 to 50 mm, and the thickness is, for example, 0.5 to 2 mm. The position of the sealing material 14 may be the both end positions of the intermediate cylindrical body in the installed state of the intermediate cylindrical body 12, or may be a position spaced a predetermined distance from both ends, for example, 0.1 to 20 cm. A plurality of sealing materials 14 may be provided at intervals in the axial direction of the intermediate cylindrical body 12. As a material of the sealing material 14, a normal rubber or a water swelling rubber can be used.

  In the present invention, the intermediate cylindrical body 12 includes fibers, and is preferably composed of fibers. The intermediate cylindrical body 12 preferably has a gap at least in a state before installation. The intermediate cylindrical body 12 is preferably a fiber material such as a nonwoven fabric (a fiber material such as polyester fiber). The intermediate cylindrical body 12 more preferably includes a water expansion material. By including the water expansion material, the water expansion material expands due to the groundwater flowing from the aging part of the existing pipe after installation, and the space inside the intermediate cylindrical body is further reduced. Water effect is demonstrated.

  As the water-swelling material, for example, water-swelling fibers or water-swelling particles made of a water-swelling polymer (such as sodium polyacrylate) or a water-swelling rubber can be used. As the intermediate cylindrical body 12, it is preferable to use a fiber material (for example, non-woven fabric, woven fabric, knitted fabric, etc., preferably felt) containing a water expansion material. As such a fiber material, the whole may consist of a water-expandable fiber, or a combination of a water-expandable fiber and a non-water-expandable fiber (polyester fiber such as polyethylene fiber or PET) is used as a fiber material, A non-water-expandable fiber material containing water-expandable particles can be used. In the case of a fiber material in which water-swelling fibers and non-water-swelling fibers are combined, the weight ratio of the water-swelling fibers is preferably 40% or more.

  Hereinafter, the process of forming the pipeline repair structure of the present invention will be described. FIG. 2 is an explanatory view showing a process of forming the pipeline repair structure of the present invention. As illustrated, a sewer main 100 as an existing pipe is connected in communication between two relay structures 102-1 and 102-2 (for example, human holes). Before performing the operation of forming the pipeline repair structure of the present invention, the pipeline is cleaned as necessary.

  In order to form the pipe line repair structure of the present invention, first, the intermediate tubular body 12 shown in FIG. 1 is introduced into the sewer main pipe 100 by, for example, pulling-in operation. The intermediate cylindrical body 12 is not in a circular cross-sectional state when introduced, but is folded and recessed due to its flexibility.

  Next, as shown in FIG. 3, a tubular curable lining material 16 is introduced into the intermediate cylindrical body 12 in an uncured folded state. It is preferable to use a lining material 16 whose outer diameter is slightly larger than the inner diameter of the intermediate cylindrical body 12 before compression (smaller than the inner diameter of the sewer main pipe 100). The thickness of the lining material 16 can be appropriately set according to the size of the sewer main 100.

  FIG. 4 is an explanatory diagram showing a state in which the lining material 16 is pressed against the inner surface of the existing pipe 100 through the intermediate cylindrical body 12 after the lining material 16 is introduced into the intermediate cylindrical body 12.

  After the lining material 16 is introduced, both ends of the lining material 16 are sealed with a cylindrical sealing member 20 and an annular fastening band 22 to form a sealed space 26, and then a predetermined pressure is applied from the hose 24 to the sealed space 26. A gas such as air is introduced, and the pressure in the sealed space 26 is set to, for example, 0.05 to 0.12 MPa. Thereby, the lining material 16 is pressed against the inner surface of the sewer main pipe 100 through the intermediate cylindrical body 12. Prior to this operation, the position of the sealing material 14 is appropriately adjusted by visual observation or the like so that it becomes a desired position. In the illustrated state, the sealing material 14 is disposed in the vicinity of the end of the sewer main 100. Although not shown in the drawing, the same configuration is applied to the end portion on the opposite side (the relay structure 102-2 side shown in FIG. 1).

  The lining material 16 may be conventionally used, and a curable lining material that is cured by light or heat, a thermoplastic lining material, or the like can be used. As the lining material 16, for example, a lining having a base material layer containing a curable resin composition, an inner protective film laminated inside the base material layer, and an outer protective film laminated outside the base material layer. Material can be used.

  The base material layer can be formed by impregnating a base material such as glass fiber with a curable resin composition. The curable resin composition may be a thermosetting resin composition or a photocurable resin composition. A film such as a polyethylene film or a PET film can be used for the inner protective film and the outer protective film.

  Next, the lining material 16 is cured in the state shown in FIG. When the lining material 16 is photocurable, the curing operation of the lining material 16 can be performed, for example, by introducing an ultraviolet lamp inside the lining material 16 and irradiating with ultraviolet rays. When the lining material 16 is thermosetting, a method of heating the lining material 16 by introducing a heater inside the lining material 16, a method of heating by introducing pressure steam inside the lining material 16, There is a method in which a holed hose is drawn from one end to the other end inside the lining material 16 and hot water is brought into contact with the lining material 16 in the hose. These curing operations can be performed in the same manner as conventionally performed.

  FIG. 5 is an explanatory view showing a state in which the hardening operation of the lining material 16 is finished, the pipe opening processing of the intermediate cylindrical body 12 and the lining material (rehabilitation pipe) 16 is performed, and the pipeline repair structure of the present invention is formed. It is. As shown in the figure, a rehabilitation pipe 16 installed inside a sewer main pipe 100 which is an existing pipe is installed, and an intermediate cylindrical body 12 is arranged between the sewer main pipe 100 and the rehabilitation pipe 16. The sealing material 14 is provided between the intermediate tubular body 12 and the sewer main 100. A portion indicated by a broken line 200 is a suppressing unit 200 that suppresses groundwater flowing into the inside of the sewer main 100 from the crack 100 a of the sewer main 100 from flowing along the intermediate cylindrical body 12. In the suppression part 200, the thickness of the intermediate cylindrical body 12 is thinner than the other part because the sealing material 14 is interposed. That is, it is a high-density part having a higher degree of compression and higher density than other parts. Therefore, in the suppression part 200, the space | gap in the intermediate | middle cylindrical body 12 inside is smaller than another part, and it becomes possible to suppress that groundwater flows in the intermediate | middle cylindrical body 12 by this. Therefore, it is suppressed that the groundwater which flowed in through the crack 100a of the sewer main 100 flows to the relay structure 102-1 side along the intermediate cylindrical body 12, and the fiber contained in the intermediate cylindrical body 12 flows out. It can also be suppressed. Thereby, while being able to obtain the water stop function and ground followability by the intermediate cylindrical body 12, these functions can be maintained over a long period after repair.

Moreover, since the lining material 16 is pressed against the inner surface of the sewer main pipe 100 via the intermediate cylindrical body 12, the intermediate cylindrical body 12 is arranged in a compressed state as compared with the state before installation. That is, the thickness of the intermediate cylindrical body 12 in the installed state is thinner than the state before the installation. The thickness of the non-compressed intermediate cylindrical body 12 before installation is, for example, 3 to 15 mm, preferably 4 to 10 mm, and the thickness in the compressed state after installation is, for example, 1 to 5 mm, preferably 1 to 3 mm. is there. The thickness of the portion overlapping the sealing material 14 of the intermediate cylindrical body 12 is further reduced, for example, 0.3 to 1 mm. In the case of such a thickness, the basis weight of the intermediate cylindrical body 12 is generally 200 to 1000 g / m ² , preferably 300 to 600 g / m ² . The thickness after compression is generally ½ or less, preferably １ ／ or less of the thickness before compression.

  By being installed in a compressed state, the space inside the intermediate cylindrical body 12 is installed as small as possible, and it is as much as possible that groundwater flows inside the intermediate cylindrical body 12. Can be suppressed. In particular, when the intermediate tubular body 12 includes a water expansion material, the water expansion material is expanded by the groundwater, and the gap inside the intermediate cylindrical body 12 can be further reduced. The water stoppage as a whole is also improved.

  In the example described above, the example in which the intermediate cylindrical body 12 and the lining material 16 are separately introduced into the sewer main pipe 100 has been shown. However, an integrated body in which the intermediate cylindrical body 12 is provided on the outside of the lining material 16 in advance is manufactured. However, a method of introducing this into the sewer main 100 may be adopted. Moreover, although the position of the sealing material 14 showed the example provided between the sewer main pipe 100 and the intermediate cylindrical body 12, it is good also as a structure provided between the intermediate cylindrical body 12 and the renovated pipe 16, When the intermediate cylindrical body 12 has a two-layer configuration, it may be configured to be installed between the two layers. The sealing material 14 is provided in the vicinity of the relay structure 102-1, preferably within 10 cm from the end of the sewer main 100, and preferably within 5 cm. Thereby, even after the existing pipe repair structure of the present invention is installed, even if the existing pipe 100 portion in the direction opposite to the end of the sewer main pipe 100 is cracked or cracked with reference to the sealing material 14, the crack or crack is generated. Since the flow of groundwater that can flow in from the water is finally blocked by the sealing material, the repair structure can be made thorough.

  Moreover, in the above-mentioned example, although the method of forming a rehabilitation pipe | tube by a lining construction method was shown, it is not restricted to this, You may form a rehabilitation pipe | tube by a sheath pipe construction method. The sheath pipe method is a construction method in which a new pipe piece that is ready-made to form a rehabilitation pipe is continuously introduced inside the existing pipe, and the new pipe piece is connected to form a single pipe as a whole within the existing pipe. It is. A method for forming the rehabilitated tube by the sheath tube method will be described below.

  First, as in FIG. 2, the intermediate cylindrical body 12 is introduced into the existing pipe. Next, an operation of inserting a ready-made new tube piece inside the intermediate cylindrical body 12 is performed. FIG. 6 shows a process of inserting the new tube piece into the intermediate cylindrical body 12. The new pipe piece 40-1 is manufactured in advance at the factory, and is configured to have an appropriate thickness corresponding to the situation of the sewer main 100 at the installation location, for example, polyethylene, polyvinyl chloride, polybutylene terephthalate, or the like. ing. In addition, the new tube to be formed is inserted and installed so as to be continuous over the entire length by sequentially connecting the new tube pieces 40-1 formed from about 50 cm to 100 cm in length, for example. It is.

  Further, in the present embodiment, a leading body 42 whose outer diameter gradually decreases toward the leading end is detachably attached to the leading end in the traveling direction of the leading new tube piece 40-1. The head body 42 is formed of, for example, a steel material (aluminum, aluminum alloy, etc.) that is lightweight and has a hardness that does not deform during the progress of the insertion. It is intended to facilitate.

  The advancement of the new tube piece 40-1 is performed, for example, by pulling the head body 42 in the direction of the arrow 300 with the wire 44 or the like. It is possible to use a normal method in which a hook portion 46 is provided at the tip of the head body 42, the wire 44 or the like is locked to the hook portion 46, and then pulled. In addition to traction, it is also possible to insert a new tube by pushing it from the rear (starting side), using both traction from the front (arrival side) and pushing from the rear (starting side). Can also be done. Although the new pipe piece 40-1 is shown only at the top, the same new pipe piece 40-1 is connected sequentially from the rear, and a plurality of new pipe pieces 40- are connected to the entire sewer main pipe 100. A new pipe consisting of 1 is installed.

  After inserting all the new pipe pieces, the pipe repair process of the present invention is obtained by performing the pipe opening process. FIG. 7 is a sectional view thereof. As in the embodiment shown in FIG. 5, in the vicinity of the end portion of the sewer main 100, the sealing material 14 is provided between the sewer main 100 and the intermediate cylindrical body 12, and the suppression unit 200 is formed. Yes.

  FIG. 8 is an explanatory view showing another embodiment of the pipeline repair structure of the present invention. As shown in the drawing, the lining material 56 is in direct contact with the sewer main 100 at the end of the sewer main 100, that is, at the connection between the sewer main 100 and the relay structure 102-1, and other than the end. In this portion, the lining material 56 is provided with the intermediate cylindrical body 52 interposed therebetween. By adopting a structure in which the lining material 56 and the sewer main 100 are in direct contact with each other, the flow of water can be blocked there, so that the fibers contained in the intermediate cylindrical body 52 can be prevented from flowing together with the water, The repair effect by the cylindrical body 52 can be maintained over a long period of time. In the present embodiment, a portion indicated by a broken line 400 is a suppressing unit that suppresses the groundwater flowing from the crack of the sewer main 100 from flowing along the inside of the intermediate cylindrical body 52. This embodiment is particularly advantageous when the intermediate cylindrical body 12 is water expandable by including a water expandable material. In the case of water expandability, the water stopping property is exhibited by the entire intermediate cylindrical body 12, and even if there is a slight gap between the lining material 56 and the sewer main pipe 100, the flow of water is prevented.

  In order to obtain such a pipe line repair structure, an integrated object in which the intermediate cylindrical body 52 is previously mounted on the outer periphery of the lining material 56 is introduced into the sewer main pipe 100 and then the inner surface of the sewer main pipe 100 is introduced. It can obtain by making it harden | cure in the state pressed on. For the introduction work, the pressing work, and the hardening work of the integrated object, the same technique as that of the above-described embodiment can be used. The lining material 56 and the intermediate cylindrical body 52 can be the same as those described in the above-described embodiment.

  FIG. 9 is an explanatory view showing another embodiment of the pipeline repair structure of the present invention. The feature of the present embodiment is an example in which the suppression unit (reference numeral 400) shown in FIG. 8 is combined with the suppression part (reference numeral 200) shown in FIG. That is, the intermediate cylindrical body 52 is formed on the side opposite to the relay structure 102-1 with respect to the suppression section 400 formed by bringing the intermediate cylindrical body 52 and the sewer main pipe 100 into direct contact with each other. And the control part 200 formed by providing the sealing material 14 between the main sewer 100 and the sewer. Thus, by providing two suppression parts, further thoroughness of a water stop function is achieved. In the drawing, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The present invention is not limited to the configuration of the above embodiment, and various modifications are possible within the scope of the gist of the invention.

12 Intermediate tubular body 14 Sealing material 16 Lining material (rehabilitation pipe)
DESCRIPTION OF SYMBOLS 20 Sealing member 22 Fastening band 24 Hose 40-1 New pipe piece 42 Lead body 44 Wire 46 Hook part 52 Intermediate cylindrical body 56 Lining material 100 Sewer main pipe 102-1 and 102-2 Relay structure

Claims (7)

In a pipe repair structure having an existing pipe, a rehabilitation pipe installed inside the existing pipe, and an intermediate cylindrical body including a fiber disposed between the existing pipe and the rehabilitation pipe,
The intermediate cylindrical body is formed of a nonwoven fabric having a gap,
In order to suppress the groundwater flowing into the existing pipe from the crack of the existing pipe from flowing along the intermediate cylindrical body, the thickness of the intermediate cylindrical body is reduced more than other parts. Part is provided,
The said pipe | tube repair structure characterized by the said suppression part being provided in the said intermediate | middle cylindrical body by forming a high-density part with a space | gap and a low density rather than another part . The high-density part is compressed more than the other part by providing an annular seal material between the existing pipe and the intermediate cylindrical body or between the rehabilitated pipe and the intermediate cylindrical body. The pipe repair structure according to claim 1 , wherein the pipe repair structure is formed by being in a state of being made. The end of the existing pipe connected to the relay structure has a portion where the existing pipe and the rehabilitation pipe are in direct contact with each other without the intermediate cylindrical body, and the relay is based on this portion. The pipe repair structure according to claim 2, further comprising a suppressing portion compressed by the seal material on the opposite side of the structure. Conduit repair structure according to any one of claim 1 to 3, wherein said reduction unit, characterized in that from the end of which is connected to the RELAY structure the existing pipe provided within 10 cm. The pipe repair structure according to any one of claims 1 to 4 , wherein the intermediate cylindrical body includes a water expansion material. The rehabilitation pipe is introduced into the existing pipe in an uncured state with a tubular curable lining material, and the curable lining material is pressed against the inner surface of the existing pipe through the intermediate cylindrical body, The pipe repair structure according to any one of claims 1 to 5 , wherein the pipe repair structure is formed by curing the curable lining material. The said rehabilitation pipe | tube is formed by introduce | transducing a plurality of ready-made new pipe pieces continuously inside the said intermediate | middle cylindrical body, The any one of Claims 1-5 characterized by the above-mentioned. The described pipeline repair structure.

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