JP2017020542A - Piping repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping repair method capable of restricting its cost and keeping adhesion between a damaged location of the piping and a repair member for a long period of time.SOLUTION: A piping repair method of this invention comprises a preparing process for preparing a repair member 10 having a cylindrical member 1 of which one end and the other end in a peripheral direction are overlapped in a radial direction inserted into a water expansion member 2; an insertion process for inserting an air packer 3 into the cylindrical member 1 of the repair member 10; an arranging process for inserting the repair member 10 having the air packer 3 inserted therein into a piping 21 and arranging it adjacent to a damaged location H; a first adhesion process for pouring air into the air packer 3 and expanding a diameter of the cylindrical member 1 until one end part and the other end part are not overlapped in their radial directions and at the same time bonding an outer circumferential surface of the water expansion member 2 to an inner circumferential surface of the piping 21; and a process for removing the air packer 3.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a method for repairing piping buried in the ground, in particular piping or pipes connected to manholes.

  Piping of underground drainage facilities (also called existing pipes) buried in the ground may be eroded by corrosive gases or deposits, etc., due to long-term use. Moreover, piping may be damaged by ground subsidence or pressure from the ground. If the pipe is damaged, the water in the pipe may leak out. Therefore, repairs to damaged pipes are carried out.

  As a technique for repairing a pipe, for example, Patent Document 1 discloses a method of repairing a joint portion between a horizontally disposed sewer main pipe and a branch pipe extending vertically from the sewer main pipe. In this method, an elastically deformable material, such as rubber, has a cylindrical rehabilitation having a flange at the lower end and a plurality of radially arranged locking pieces at the lower end, is made of spring steel, and is compressed. And a base in a diameter state. A base having a reduced diameter is inserted into the further living body. Then, while maintaining the diameter-reduced state by the diameter-reducing jig, the living body with the base inserted is inserted into the branch pipe, and the diameter-reducing jig is removed. As a result, the reduced diameter state of the base is released and the base expands, so that the living body is brought into close contact with the inner peripheral surface of the branch pipe, and the flange portion is connected to the sewer main by the elastic force of the locking piece. It is in close contact with the inner peripheral surface.

  For example, Patent Document 2 discloses a technique for repairing an attachment pipe branched from a main pipe. In this method, a cylindrical portion made of an elastic material having a water-expandable rubber provided on the outer peripheral surface, a diameter-enlarged ring obtained by winding a long stainless steel plate into a cylindrical shape, and an air packer are used. A diameter-enlarged ring wound in a cylindrical shape is attached to the inner peripheral surface of the cylindrical portion. And an air packer is inserted in a diameter expansion ring, and the said diameter expansion ring is expanded by expanding the said air packer. Thereby, the cylinder part pressed by the diameter-expansion ring is closely_contact | adhered to the internal peripheral surface of an attachment pipe.

JP-A-8-86002 JP-A-10-267182

  However, in the technique of the above-mentioned Patent Document 1, since the flange portion is brought into close contact with the inner peripheral surface of the sewer main by the elastic force of the locking piece, the influence of the gravity of the repair member itself and the flowing water contact Thereby, there exists a possibility that the adhesiveness of the flange part with respect to the internal peripheral surface of a sewer main may fall. In addition, since there is no mention of how far the base is to be expanded, the base may be returned from the reduced diameter state to the reduced diameter state even though the base is once expanded from the reduced diameter state. As a result, the adhesion of the flange portion may be reduced. Moreover, in the technique of patent document 2, the stainless steel diameter expansion ring may rust and is unsuitable for long-term use. Moreover, since many members, such as a water expansible rubber | gum, a cylinder part, and a diameter expansion ring, are required as a repair member, cost will start.

  This invention is made in view of this point, The objective is suppressing the cost and providing the repair method of piping which can maintain the adhesiveness of the damaged location and repair member of piping for a long period of time. It is.

  In the pipe repair method according to the present invention, an expansion body that expands by injecting gas or liquid, a cylindrical rubber member, and one end portion and the other end portion in the circumferential direction are overlapped in the radial direction to reduce the diameter. A repair member having a cylindrical member capable of diameter repair, and repairing a damaged portion of a pipe embedded in the ground, wherein one end and the other end of the rubber member are radially arranged A preparation process for preparing a repair member in which a cylindrical member in an overlapped state is inserted, an insertion process for inserting an expansion body into the cylindrical member of the repair member, a repair member is inserted into the pipe, and is arranged next to the damaged portion. Arrangement process and injecting gas or liquid into the expansion body to expand the expansion body, and expand the cylindrical member until one end and the other end of the cylindrical member do not overlap in the radial direction. The first contact is made to bring the outer peripheral surface of the rubber member into close contact with the inner peripheral surface of the pipe including the damaged part. And degree, remove the gas or liquid inflatable body to contract the expandable body, and a, and a step removing removing the expansion body. Note that the insertion step of inserting the expansion body may be performed on the cylindrical member of the repair member after the placement step, or may be performed on the cylindrical member of the repair member before the placement step. Good.

  According to the pipe repair method according to the present invention, the one end portion and the other end portion of the tubular member do not overlap in the radial direction of the tubular member, that is, the end surface of the one end portion of the tubular member. The diameter of the cylindrical member is expanded until at least a part contacts the end surface of the other end. This makes it difficult to reduce the diameter again after the cylindrical member has expanded. Thereby, since the diameter-expanded state of the cylindrical member can be maintained, the adhesion of the rubber member to the inner peripheral surface of the pipe can be maintained. Also, when repairing the inner peripheral surface of a horizontally arranged pipe, the outer peripheral surface of the rubber member is brought into close contact with the inner peripheral surface of the pipe, so that the adhesiveness is reduced due to the gravity of the repair member itself as in the past. There is no fear of doing it. Thereby, the adhesiveness of the repair member with respect to the internal peripheral surface of piping can be maintained. Furthermore, the number of components of a repair member can be reduced compared with the past using a cylindrical member and a rubber member as a repair member. For this reason, cost can be held down. By the above method, cost can be suppressed and the adhesiveness of the damaged part of piping and a repair member can be maintained for a long period of time.

  According to a preferred aspect of the present invention, the gas or liquid is injected to expand the expansion body, the cylindrical member is expanded in diameter, and the outer peripheral surface of the cylindrical member is in close contact with the inner peripheral surface of the rubber member. A contact process is further provided, and after the second contact process, the placement process and the first contact process are sequentially performed.

  According to the above aspect, the repair member in a state where the outer peripheral surface of the cylindrical member is in close contact with the inner peripheral surface of the rubber member is inserted into the pipe, that is, the repair in a state where the cylindrical member is positioned with respect to the rubber member. Since the member is inserted into the pipe, the repair member can be easily arranged. When inserting a repair member in a state where the outer peripheral surface of the cylindrical member is not in close contact with the inner peripheral surface of the rubber member, the cylindrical member and the rubber member are separately inserted into the pipe and positioned in the pipe. Need to do. Or after inserting a cylindrical member and a rubber member together, it is necessary to position a cylindrical member with respect to a rubber member within piping. In contrast, the present invention does not require such trouble. Therefore, the workability is remarkably improved.

  According to another preferable aspect of the present invention, in the first contact step, the end surface of the one end is in contact with the end surface of the other end so that the outer peripheral surface and the inner peripheral surface of the cylindrical member are flush with each other. To do.

  According to the above aspect, it is possible to prevent the diameter of the cylindrical member from being reduced again after the diameter is increased. Moreover, since the outer peripheral surface and inner peripheral surface of a cylindrical member become the same respectively, the obstruction with respect to the flow direction of flowing water does not arise. Thereby, while flowing water flows smoothly, the dust etc. which flow with flowing water are not caught by a cylindrical member.

  According to another preferable aspect of the present invention, the first determination is made based on the pressure of the gas or liquid injected into the expansion body, whether or not the end surface of the one end portion of the cylindrical member is in contact with the end surface of the other end portion. The method further includes a process.

  According to the above aspect, by checking the pressure of the gas or liquid injected into the expansion body, it is possible to determine the appropriate time to stop the injection of the gas or liquid into the expansion body.

  According to another preferable aspect of the present invention, the second determination step of determining whether or not the end surface of the one end portion of the tubular member has contacted the end surface of the other end portion from the contact sound generated when the contact is made. I have.

  According to the above aspect, by checking the contact sound generated when the end surface of the one end portion of the cylindrical member contacts the end surface of the other end portion, it is determined when it is time to stop the injection of gas or liquid into the expanding body. be able to.

  According to another preferable aspect of the present invention, the pipe is a pipe vertically embedded in the ground or connected horizontally to a manhole, and the repair member is disposed in the pipe.

  According to the above aspect, the repair member having the cylindrical member in which the diameter is expanded until the one end and the other end do not overlap in the radial direction, and the outer peripheral surface and the inner peripheral surface are flush with each other. Since it arrange | positions in the said piping, an obstruction is not formed in a cylindrical member, but flowing soil and dirt etc. which flow with the said flowing water flow smoothly.

  According to another preferable aspect of the present invention, in the arranging step, the repairing member is arranged such that a part of the repairing member is located on the inner side of the inner peripheral surface of the manhole.

  According to the above aspect, even if an operator does not enter the manhole, it is easily confirmed that the repair by the repair member is being performed when looking downward from the inspection port at the top of the manhole. be able to. Moreover, even when the inner peripheral surface of the pipe is almost as close as possible to the inner peripheral surface of the manhole, the damaged portion can be reliably repaired by arranging the repair member as described above.

  According to another preferable aspect of the present invention, in the arranging step, the repair member is inserted into the pipe so that the one end portion and the other end portion are located on the upper portion of the tubular member.

  According to the said aspect, even when the internal peripheral surface of a cylindrical member is not in the state of a flush surface, it becomes difficult to inhibit flowing water, soil, garbage, etc. flowing smoothly.

  According to another preferred embodiment of the present invention, the cylindrical member is reduced in diameter by providing a notch on an imaginary line extending in the axial direction of the cylindrical member and radially with respect to the center of the cylindrical member. Is used.

  According to the said aspect, since the contact line of the end surface of the one end part of a cylindrical member and the end surface of the other end part becomes a line extended radially, it becomes difficult to reduce the diameter of the cylindrical member in the diameter-expanded state.

  According to another preferable aspect of the present invention, a cylindrical body is used as the expanding body.

  According to the said aspect, it becomes easy to expand a cylindrical member compared with the case where a spherical expansion body is used, for example.

  ADVANTAGE OF THE INVENTION According to this invention, the repair method of piping which can suppress cost and can maintain the adhesiveness of the broken location and repair member of piping for a long period can be provided.

(A) is a perspective view of the cylindrical member which concerns on one Embodiment of this invention, (b) is a side view of the cylindrical member provided with the notch. (A) is a perspective view which shows the state which reduced the diameter of the cylindrical member provided with the notch which concerns on one Embodiment of this invention, (b) is a reduced diameter of the cylindrical member provided with the notch. It is a side view which shows the state made to do. It is a perspective view of the water expansible member concerning one embodiment of the present invention. It is a perspective view which shows the state by which the cylindrical member was inserted in the water expansible member which concerns on one Embodiment of this invention. It is a perspective view which shows a mode that an air packer is inserted in the cylindrical member of FIG. It is sectional drawing which shows the state which expanded the air packer of FIG. 5 and made the cylindrical member closely_contact | adhere to the internal peripheral surface of a water-expandable member. (A), (b) is a side view of the cylindrical member expanded in diameter, (c) is a side view of the cylindrical member expanded further in diameter. It is sectional drawing which shows the state which has arrange | positioned the repair member of FIG. 6 in piping. It is sectional drawing which shows the state which closely_contact | adhered the water expansible member which concerns on one Embodiment of this invention to the internal peripheral surface of piping. It is sectional drawing which shows the state which repaired piping by the repair member which concerns on one Embodiment of this invention was completed.

  Hereinafter, a pipe repair method according to an embodiment of the present invention will be described. In the present embodiment, the piping is vertically buried in the ground or connected horizontally to the manhole. This piping may be called an existing pipeline, a sewer main, or simply a main. Although details will be described later, in the present embodiment, when repairing a pipe, a repair member including a tubular member and a water-expandable member and an air packer that expands by injecting air are used. The “repair” in the present invention is not to restore the damaged pipe itself but to restore the function of the damaged pipe as a pipeline.

  As shown to Fig.1 (a), the cylindrical member 1 is formed in the cylindrical shape. The cylindrical member 1 is made of, for example, vinyl chloride. However, the material of the cylindrical member 1 is not limited to this. Other materials for the cylindrical member 1 include, for example, stainless steel that is less likely to corrode, and any material may be used as long as it has elasticity that can be reduced and expanded. Such a cylindrical member 1 is provided with a notch. Specifically, as shown in FIG. 1B, the cylindrical member 1 is cut along an imaginary line D <b> 2 that radially extends with respect to the center C of the cylindrical member 1 in the axial direction D <b> 1 of the cylindrical member 1. The notch 1a is processed. For processing the notch 1a, for example, a circular saw, a contour machine, or the like is used. Due to the notches 1a, the tubular member 1 has one end 1b and the other end 1c in the circumferential direction. At the stage where the notch 1a is provided, the one end 1b and the other end 1c of the cylindrical member 1 face each other and contact each other.

  Subsequently, as shown in FIG. 2A, the diameter of the cylindrical member 1 provided with the notch 1a (see FIG. 1B) is reduced. In this case, the operator reduces the diameter of the cylindrical member 1 so that the surface of the one end 1b of the cylindrical member 1 is in contact with the back surface of the other end 1c. Thereby, the other end 1c of the cylindrical member 1 is positioned on the outer side in the radial direction than the one end 1b. Thereby, the one end part 1b and the other end part 1c of the cylindrical member 1 overlap with the radial direction of the said cylindrical member 1, and it will be in the state by which the cylindrical member 1 was diameter-reduced. In addition, you may reduce the diameter of the cylindrical member 1 so that the one end part 1b of the cylindrical member 1 may be located in the radial direction outer side rather than the other end part 1c. As shown in FIG. 2B, the length of the portion where the one end 1b and the other end 1c of the cylindrical member 1 overlap in the radial direction of the cylindrical member 1, that is, the end surface of the one end 1b and the other. The distance from the end surface of the end 1c is L1. If this L1 is too large, it will be difficult to insert the air packer 3 described later, and if L1 is too small, the force that presses the inner peripheral surface of the water expandable member 2 described later will be weakened when the diameter of the tubular member 1 is increased. Considering these, it is desirable to set the above L1.

  Next, the water expandable member as a rubber member will be described. As shown in FIG. 3, the water-expandable member 2 is formed in a cylindrical shape. The water expandable member 2 is formed in a cylindrical shape. The water-swellable member 2 is made of, for example, a water-swellable rubber. Although details will be described later, the tubular member 1 described above is inserted into the water-expandable member 2. The water-expandable member 2 has an inner diameter that is larger than the maximum length L2 of the tubular member 1 in FIG. More specifically, the inner diameter of the water-expandable member 2 is the tubular member 1 when the tubular member 1 is reduced in diameter and the one end 1b and the other end 1c overlap in the radial direction of the tubular member 1. It is larger than the maximum length L2 in the radial direction. Thereby, the cylindrical member 1 in a reduced diameter state can be inserted into the water-expandable member 2. The length of the water-expandable member 2 (that is, the length of the water-expandable member 2 in the axial direction) is desirably larger than the same length of the tubular member 1.

  Using the cylindrical member 1 and the water-expandable member 2 as described above, a repair member 10 is formed as shown in FIG. Specifically, the repair member 10 is formed by inserting the tubular member 1 having a diameter reduced by the above-described method into the water-expandable member 2. If the cylindrical member 1 is moved so that the central axis of the water-expandable member 2 and the central axis of the cylindrical member 1 are parallel, the insertion becomes easy. As described above, since the inner diameter of the water expandable member 2 is larger than the maximum length L2 in the radial direction of the reduced tubular member 1, the tubular member 1 is replaced with the water expandable member 2. Can be inserted into. At this time, the cylindrical member 1 inserted into the water-expandable member 2 maintains a reduced diameter inside the water-expandable member 2. In this case, at least a part of the outer peripheral surface of the tubular member 1 is in contact with the inner peripheral surface of the water-expandable member 2. One end 1b of the cylindrical member 1 is not in contact with the inner peripheral surface of the water-expandable member 2 because the one end 1b is on the inner side in the radial direction than the other end 1c. The other end 1c of the tubular member 1 may be in contact with the inner peripheral surface of the water-expandable member 2, or may not be in contact with the inner peripheral surface.

  Next, as shown in FIG. 5, the air packer 3 is inserted into the repair member 10 of FIG. Specifically, the air packer 3 is inserted into the cylindrical member 1 of the repair member 10. When the air packer 3 is moved so that the central axis of the cylindrical member 1 and the central axis of the air packer 3 are parallel, the insertion becomes easy. When the air packer 3 is inserted into the cylindrical member 1, a part of the outer peripheral surface of the air packer 3 is in contact with the inner peripheral surface of the cylindrical member 1, but the entire outer peripheral surface of the air packer 3 is a cylinder. It is not in contact with the inner peripheral surface of the member 1. The air packer 3 is a cylindrical one. The air packer 3 includes a rubber-made hollow cylindrical main body portion 3a, a convex portion 3b provided on the outer peripheral surface so as to surround the outer peripheral surface of the main body portion 3a, and an air hose 3c connected to the main body portion 3a. And. One end of the air hose 3c communicates with the inside of the main body 3a. The other end of the air hose 3c is connected to an air supply device (not shown) arranged on the ground via a manhole. As the air supply device, one having a pressure measuring device is used. Air is supplied to the main body 3a through the air hose 3c by the air supply device. When air is supplied, the air packer 3 expands. In this case, the air packer 3 expands at least in the radial direction of the air packer 3. The air packer 3 may expand not only in the radial direction of the air packer 3 but also in the axial direction of the air packer 3.

  Subsequently, air is supplied to the air packer 3 in a state of being inserted into the tubular member 1 of the repair member 10. Thereby, as shown in FIG. 6, the main-body part 3a of the air packer 3 expand | swells at least to the radial direction of the said main-body part 3a. In this case, the outer peripheral surface of the main body 3 a of the air packer 3 is pressed against the inner peripheral surface of the tubular member 1. At this time, the diameter of the cylindrical member 1 in the reduced diameter state (the state shown in FIG. 4) is slightly increased. Specifically, as shown in FIG. 7A, the distance L1a of the portion where the one end 1b and the other end 1c of the cylindrical member 1 overlap in the radial direction of the cylindrical member 1 is reduced. It becomes smaller than the distance L1 in the state (the state of FIG. 2B). That is, the one end 1b slightly moves in the restoring direction (leftward in FIG. 7A) while sliding on the back surface of the other end 1c, and the other end 1c is restored while sliding on the surface of the one end 1b. The state is slightly moved in the direction (rightward in FIG. 7A). As described above, when the diameter of the cylindrical member 1 is increased, the cylindrical member 1 is pressed against the water-expandable member 2 as shown in FIG. Thereby, the state in which the tubular member 1 is in close contact with the water-expandable member 2 in the repair member 10 can be formed. The step of injecting air into the air packer 3 and bringing the tubular member 1 into close contact with the water-expandable member 2 is performed on the ground.

  Next, as shown in FIG. 8, the repair member 10 is disposed in the pipe 21. Details will be described below. The pipe 21 is buried in the ground. The pipe 21 extends horizontally. The manhole 20 is buried in the ground. The manhole 20 is connected vertically to the pipe 21. It is assumed that a broken portion H exists near the joint between the manhole 20 and the pipe 21. The broken portion H often occurs in the vicinity of the joint, which is such a relatively weak portion. Here, in this embodiment, before arrange | positioning the repair member 10 in the piping 21, the circumferential part (damage location) where the water-swellable member 2 of the repair member 10 comes into contact in a post process among the piping 21. For example, a high pressure washer is used. By cleaning, the inner peripheral surface of the pipe 21 becomes wet. After the cleaning by the high pressure washer, as shown in FIG. 8, the repair member 10 in a state where the tubular member 1 is in close contact with the water-expandable member 2 is inserted into the pipe 21 together with the air packer 3. In this case, the repair member 10 together with the air packer 3 is lowered from the ground below the manhole 20. Thereafter, an operator on the ground uses the work rod or the like to cause the repair member 10 to enter the pipe 21 together with the air packer 3. The repair member 10 in a state where the air packer 3 is inserted is arranged next to the damaged portion H of the pipe 21. The repair member 10 is arranged so that a part of the repair member 10 is located immediately below the damaged portion H. If the inner diameter of the manhole 20 is relatively large and the depth of the manhole 20 is relatively shallow, an operator may enter the manhole 20 and enter the repair member 10 together with the air packer 3 toward the pipe 21. Good. In an underground drainage facility in which a hole is provided in the peripheral wall of the manhole 20 and a pipe line is connected to the hole, a damaged portion generated in the pipe line can be similarly repaired.

  When the repair member 10 is disposed in the pipe 21, the cutout 1a of the tubular member 1 (see FIG. 1B), in other words, one end 1b of the tubular member 1 (see FIG. 7A). ) And the other end portion 1c (see FIG. 7A) are preferably positioned above the cylindrical member 1. The upper part of the cylindrical member 1 refers to a part of the cylindrical member 1 that is located above an intermediate point on a line connecting the uppermost point and the lowermost point of the cylindrical member 1 in FIG. . Moreover, it is desirable to arrange the repair member 10 so that a part of the repair member 10 is located inside the inner peripheral surface of the manhole 20. In FIG. 8, the right end portion of the repair member 10 is located inside the inner peripheral surface of the manhole 20.

  Subsequently, air is further injected into the air packer 3 disposed in the pipe 21. Thereby, the cylindrical member 1 is further expanded in diameter from the state of Fig.7 (a). In this case, the cylindrical member 1 becomes the state of FIG. 7C through the state of FIG. This will be described in detail below. When the diameter of the cylindrical member 1 is increased by further injecting air into the air packer 3, the one end 1b of the cylindrical member 1 moves slightly more in the restoring direction than in the state of FIG. The end 1c moves slightly more in the restoring direction than in the state of FIG. Thereby, as shown in FIG.7 (b), a part of end surface of the one end part 1b of the cylindrical member 1 and a part of end surface of the other end part 1c will be in the state which mutually contacted. In this case, the outer peripheral surface and the inner peripheral surface of the cylindrical member 1 are not flush with each other. Therefore, there is a step in the axial direction of the cylindrical member 1. In the above case, the distance L1 (see FIG. 2B) where the one end 1b and the other end 1c overlap in the radial direction of the cylindrical member 1 is zero.

  Subsequently, as shown in FIG. 7C, the entire end surface of the one end 1b of the cylindrical member 1 and the entire end surface of the other end 1c are in contact with each other. At this time, the outer peripheral surface and inner peripheral surface of the cylindrical member 1 are in a flush state. Thereby, in the cylindrical member 1, the level | step difference in the axial direction of the said cylindrical member 1 is lose | eliminated. As described above, in the tubular member 1, the notches 1a (see FIG. 1B) are formed on the virtual lines D2 (see FIG. 1B) extending radially. Thereby, since the contact line of the end surface of the one end part 1b and the end surface of the other end part 1c becomes a line extended radially, the cylindrical member 1 becomes difficult to reduce in diameter, or it does not reduce in diameter. . When the cylindrical member 1 is expanded in diameter as described above, the water-expandable member 2 expands in the radial direction of the water-expandable member 2 as shown in FIG. Thereby, the outer peripheral surface of the water-expandable member 2 is in close contact with the inner peripheral surface of the pipe 21. Moreover, since the water | moisture content by washing | cleaning has adhered to the piping 21, the water expansible member 2 absorbs the said water | moisture content. Thereby, the water-expandable member 2 further expands. Thereby, the adhesiveness of the water-expandable member 2 with respect to the inner peripheral surface of the pipe 21 is further improved. Therefore, the sealing performance of the repair member 10 with respect to the inner peripheral surface of the pipe 21 is further increased.

  Here, when the cylindrical member 1 shifts from the state of FIG. 7A to the state of FIG. 7B, that is, the one end 1b and the other end 1c of the cylindrical member 1 overlap in the radial direction. When the state is shifted from the overlapped state to the non-overlapping state, the injection of air into the air packer 3 (see FIG. 9) is stopped. In this case, when the end portion 1b and the other end portion 1c of the cylindrical member 1 are shifted from a state where they overlap in the radial direction to a state where they do not overlap, the outer peripheral surface of the one end portion 1b is the inner periphery of the water-expandable member 2. Contacting the surface makes it difficult for the cylindrical member 1 to expand further, and as a result, the pressure value of the pressure measuring device increases rapidly. The operator confirms that the pressure value has suddenly increased and stops the injection of air into the air packer 3. Alternatively, the end face of the one end 1b and the end face of the other end 1c of the cylindrical member 1 are shifted from the state where the one end 1b and the other end 1c of the cylindrical member 1 overlap each other in the radial direction. Contact with each other, or when the outer peripheral surface of the one end portion 1b contacts the inner peripheral surface of the water-expandable member 2, a contact sound is generated. The operator may confirm the contact sound and stop the injection of air into the air packer 3.

  After stopping the injection of air into the air packer 3, a part of the air in the air packer 3 is removed. Thereby, the air packer 3 contracts, and the adhesion between the outer peripheral surface of the air packer 3 and the inner peripheral surface of the cylindrical member 1 of the repair member 10 is released. Thereafter, as shown in FIG. 10, the air packer 3 is removed from the repair member 10, and the air packer 3 is taken out to the ground via the manhole 20. The repair by the repair member 10 is completed by the above method.

  As described above, in the present embodiment, until the air packer 3 is expanded, the one end 1b and the other end 1c of the tubular member 1 do not overlap in the radial direction of the tubular member 1. That is, the diameter of the cylindrical member 1 is increased until at least a part of the end surface of the one end 1b of the cylindrical member 1 comes into contact with the end surface of the other end 1c. Thereby, it becomes difficult to reduce the diameter again after the cylindrical member 1 is expanded. Thereby, since the diameter-expanded state of the cylindrical member 1 can be maintained, the adhesion of the water-expandable member 2 to the inner peripheral surface of the pipe 21 can be maintained. Further, when repairing the damaged portion H of the pipe 21, the repair member 10 is inserted into the pipe 21 so that the outer peripheral surface of the water-expandable member 2 is in close contact with the inner peripheral surface of the pipe 21. There is no possibility that the adhesiveness is lowered due to the gravity of the repair member 10 itself. Thereby, the adhesiveness of the repair member 10 with respect to the internal peripheral surface of the piping 21 can be maintained. Furthermore, as the repair member 10, the tubular member 1 and the water-expandable member 2 can be used to reduce the number of components of the repair member as compared with the conventional case. For this reason, cost can be held down. By the above method, cost can be suppressed and the adhesiveness of the damaged part H of the piping 21 and the repair member 10 can be maintained for a long period of time. By such repair, the drainage in the pipe 21 is prevented from leaking from the damaged part H to the outside for a long period of time, and water outside the pipe 21 is prevented from entering the pipe 21 from the damaged part H for a long period of time. Is done.

  Moreover, according to this embodiment, since the repair member 10 in a state where the outer peripheral surface of the tubular member 1 is in close contact with the inner peripheral surface of the water-expandable member 2 is inserted into the pipe 21, that is, the water-expandable member 2. Since the repair member 10 in a state in which the tubular member 1 is positioned with respect to the pipe 21 is inserted into the pipe 21, the repair member 10 can be easily arranged. When the repair member 10 in a state where the outer peripheral surface of the tubular member 1 is not in close contact with the inner peripheral surface of the water-expandable member 2 is inserted into the pipe 21, the tubular member 1 and the water-expandable member 2 are separated from each other. It is necessary to insert into the pipe 21 and perform positioning within the pipe 21. Alternatively, it is necessary to position the tubular member 1 with respect to the water-expandable member 2 within the pipe 21 after inserting the tubular member 1 and the water-expandable member 2 together. On the other hand, in this embodiment, such a trouble does not arise. Therefore, the workability is remarkably improved.

  Further, according to the present embodiment, the cylindrical member 1 is expanded in diameter until the one end 1b and the other end 1c of the cylindrical member 1 do not overlap in the radial direction, and the entire end surface of the one end 1b is covered. The entire end surface of the other end 1c is brought into contact with each other so that the outer peripheral surface and the inner peripheral surface of the cylindrical member 1 are flush with each other. Thereby, it is possible to prevent the diameter of the cylindrical member 1 from being reduced again after the diameter is increased. Moreover, since the outer peripheral surface and the inner peripheral surface of the cylindrical member 1 are flush with each other, there is no obstacle to the flowing direction of the flowing water. Thereby, while flowing water flows smoothly, the dust etc. which flow with flowing water are not caught by the cylindrical member 1.

  Further, according to the present embodiment, it is possible to determine the appropriate time to stop the injection of air into the air packer 3 by checking the pressure of the air injected into the air packer 3.

  Further, according to the present embodiment, the injection of air into the air packer 3 is stopped by checking the contact sound generated when the end surface of the one end 1b of the cylindrical member 1 contacts the end surface of the other end 1c. You can determine when to do it.

  Further, according to the present embodiment, the cylindrical member in a state in which the diameter is increased until the one end 1b and the other end 1c do not overlap in the radial direction, and the outer peripheral surface and the inner peripheral surface are flush with each other. The repair member 10 having 1 is disposed in the pipe 21. Thereby, an obstruction is not formed in the cylindrical member 1, and flowing water, the soil, garbage, etc. which flow with the said flowing water come to flow smoothly.

  In addition, according to the present embodiment, the repair member 10 is arranged so that a part of the repair member 10 is located inside the inner peripheral surface of the manhole 20. Accordingly, even if the operator does not enter the manhole 20, when the operator looks into the lower part from the inspection port at the top of the manhole 20, it can be easily confirmed that the repair by the repair member 10 is being performed. Further, even when the inner peripheral surface of the pipe 21 that is as close as possible to the inner peripheral surface of the manhole 20 is damaged, the damaged portion H can be reliably repaired by arranging the repair member 10 as described above. .

  Further, according to the present embodiment, the repair member 10 is inserted into the pipe 21 so that the one end 1 b and the other end 1 c are positioned on the upper part of the tubular member 1. Thereby, even when the inner peripheral surface of the cylindrical member 1 is not in a flush state (that is, when a step is generated on the inner peripheral surface), it is impeded that flowing water, dirt, garbage, and the like flow smoothly. It becomes difficult to be done.

  Moreover, according to this embodiment, since the contact line of the end surface of the one end part 1b of the cylindrical member 1 and the end surface of the other end part 1c becomes a radially extended line, the cylindrical member 1 becomes difficult to reduce in diameter. .

  Moreover, according to this embodiment, the cylindrical air packer 3 is used. This makes it easier to expand the diameter of the cylindrical member 1 than when a spherical air packer is used, for example.

  Moreover, according to this embodiment, the cylindrical member 1 made from a vinyl chloride was used. Since the cylindrical member 1 made of vinyl chloride does not have a large elastic coefficient, such as rubber, there is an advantage that it is difficult to reduce the diameter once it has been expanded. Moreover, compared with rubber | gum etc., the surface of the one end part 1b of the cylindrical member 1 at the time of diameter reduction and the back surface of the other end part 1c which contacted the said surface become easy to slip at the time of diameter expansion. Thereby, it becomes easy to expand the diameter of the cylindrical member 1.

  Although the pipe repair method according to the present embodiment has been described above, the following modifications may be applied.

  In the above embodiment, the step of injecting air into the air packer 3 and bringing the tubular member 1 into close contact with the water-expandable member 2 is performed on the ground, and the tubular member 1 is in close contact with the water-expandable member 2. After arranging the repair member 10 in the pipe 21, the outer peripheral surface of the water-expandable member 2 is brought into close contact with the inner peripheral surface of the pipe 21, but is not limited thereto. The water-expandable member 2 may be disposed in the pipe 21 and then the cylindrical member 1 may be inserted into a predetermined position of the water-expandable member 2. Then, by inflating the air packer 3, the outer peripheral surface of the tubular member 1 is brought into close contact with the inner peripheral surface of the water-expandable member 2, and then the outer peripheral surface of the water-expandable member 2 is connected to the pipe 21. You may make it closely_contact | adhere to an inner peripheral surface.

  In the said embodiment, although the air packer 3 which expand | swells by injection | pouring of air was used as an expansion body, it is not limited to this. You may make it use the expansion body which can be expanded by injection | pouring of gas or liquid (for example, oil, water, etc.).

  In the said embodiment, although the water-expandable member 2 was used as a rubber member, it is not limited to this. It is also possible to apply a rubber member that does not expand due to moisture absorption.

  In the above embodiment, the case where one damaged portion H exists in the pipe 21 has been described. However, even when two or three or more damaged portions H exist in the pipe 21, for example, these damaged portions H Repair can be performed by arranging the repair member 10 below H.

  In the above embodiment, the repair member 10 is arranged in the pipe 21 so that the one end 1b and the other end 1c of the tubular member 1 are located on the upper portion of the tubular member 1, but the present invention is limited to this. It is not something. Since the entire end surface of the one end 1b of the cylindrical member 1 and the entire end surface of the other end 1c are in contact with each other, the inner peripheral surface of the cylindrical member 1 is finally in a flush state. If there is, the one end 1b and the other end 1c may be located in the lower part of the cylindrical member 1. Even in this case, since the obstacle with respect to the flow direction of flowing water does not arise, the smooth flow of flowing water can be ensured.

  In the above embodiment, the case where the air supply device that supplies air to the air packer 3 is provided with the pressure measuring device has been described, but the present invention is not limited to this. Even if there is no pressure measuring device in the means for supplying air to the air packer 3, the contact sound generated when the end face of the one end 1b of the cylindrical member 1 contacts the end face of the other end 1c is confirmed. Thus, the injection of air into the air packer 3 can be stopped.

  Although the said embodiment demonstrated the case where the damaged part H of the piping 21 to which the manhole 20 was connected was repaired, it is not limited to this. However, the damaged portion H of the connected pipe 21 may be repaired.

  In the said embodiment, although the repair member 10 of the state which inserted the air packer 3 in the cylindrical member 1 was arrange | positioned in the piping 21, it is not limited to this. You may make it insert the air packer 3 in the cylindrical member 1 of the repair member 10 arrange | positioned in the piping 21. FIG.

  In the above embodiment, the case where the damaged portion H is generated near the joint portion between the manhole 20 and the pipe 21 has been described, but the position of the damaged portion H is not particularly limited. For example, even if the broken portion H is generated on the inner peripheral surface of the pipe 21 that is separated from the joint portion of the pipe 21, it can be repaired by the repair method of the present invention.

DESCRIPTION OF SYMBOLS 1 Cylindrical member 1a Notch 1b One end part of a cylindrical member 1c Other end part of a cylindrical member 2 Water expansible member (rubber member)
3 Air packer (expansion body)
10 Repair member 20 Manhole 21 Piping D1 Axial direction of tubular member D2 Radial imaginary line H Damaged part

Claims (10)

A repair member having an expandable body that expands by injection of gas or liquid, a cylindrical rubber member, and a cylindrical member that is reduced in diameter by overlapping one end and the other end in the circumferential direction in a radial direction. And a repair method for repairing a damaged part of a pipe embedded in the ground,
A preparation step of preparing the repair member in which the tubular member in a state where the one end portion and the other end portion overlap each other in the radial direction is inserted into the rubber member;
An insertion step of inserting the expansion body into the tubular member of the repair member;
An arrangement step of inserting the repair member into the pipe and arranging it next to the breakage point;
Gas or liquid is injected into the expansion body to expand the expansion body, and the cylindrical member is expanded until the one end and the other end of the cylindrical member do not overlap in the radial direction. A first contact step of bringing the outer peripheral surface of the rubber member into close contact with the inner peripheral surface of the pipe including the damaged portion;
Removing the gas or liquid in the expansion body to contract the expansion body and removing the expansion body. Injecting gas or liquid to expand the expansion body, further expanding the diameter of the cylindrical member, further comprising a second contact step of closely contacting the outer peripheral surface of the cylindrical member to the inner peripheral surface of the rubber member,
The pipe repair method according to claim 1, wherein after the second contact step, the placement step and the first contact step are sequentially performed.   In the first contact step, the end surface of the one end portion is in contact with the end surface of the other end portion so that the outer peripheral surface and the inner peripheral surface of the cylindrical member are flush with each other. The repair method of the described piping.   The apparatus further comprises a first determination step of determining whether an end surface of the one end portion of the cylindrical member is in contact with an end surface of the other end portion from the pressure of gas or liquid injected into the expansion body. 3. Repair method for piping according to 3.   4. The method according to claim 3, further comprising a second determination step of determining whether an end surface of the one end portion of the cylindrical member is in contact with an end surface of the other end portion from a contact sound generated when the end surface is in contact. How to repair piping. The pipe is a pipe buried vertically in the ground or connected horizontally to a manhole,
The pipe repair method according to claim 1, wherein the repair member is arranged in the pipe.   The pipe repairing method according to claim 6, wherein in the arranging step, the repairing member is arranged such that a part of the repairing member is located on the inner side of the inner periphery or the inner peripheral surface of the manhole.   8. The piping according to claim 1, wherein, in the arranging step, the repair member is inserted into the piping so that the one end portion and the other end portion are positioned on an upper portion of the cylindrical member. Repair method.   9. The cylindrical member according to claim 1, wherein the cylindrical member has a reduced diameter by providing a notch on an imaginary line extending radially in the axial direction of the cylindrical member and with reference to the center of the cylindrical member. The piping repair method according to any one of the above items.   The pipe repair method according to claim 1, wherein a cylindrical member is used as the expansion body.

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