JP2018091438A - Water stop method and structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-stopping method and a water-stopping structure at a joint between a first pipeline buried in the ground and a second pipeline branched from the pipeline, the first pipeline and the first. To provide a water-stopping method and a water-stopping structure that can be easily adapted to various pipe diameters and shapes of 2 pipelines and have excellent workability. SOLUTION: This is a water stopping method for applying a water stopping treatment to a joint portion between a first pipe buried in the ground and a second pipe branching from the first pipe. A resin composition that cures over time is applied to both the first pipe line and the second pipe line on the inner peripheral surface of each of the first pipe line and the second pipe line and at the joint portion. A water-stopping method including a water-stopping layer forming step of spraying so as to straddle and forming a water-stopping layer on the inner peripheral surface by curing the resin composition. [Selection diagram] Fig. 1

Description

  The present invention relates to a water stop method and a water stop structure at a joint portion between a pipe buried in the ground and a pipe branched from the pipe.

  Pipes for flowing sewage and drainage such as sewage pipes, industrial water pipes, and agricultural water pipes are configured by connecting a plurality of pipes buried in the ground. For example, the sewer pipe is connected to the sewer main that forms the main flow path for flowing sewage, the manhole connected to the sewer main, and the sewer main and the ground-side dredger. It is configured with a mounting tube.

  Thus, in the pipeline structure having a plurality of pipelines buried in the ground, the junction between the first pipeline extending in one direction and the second pipeline branched from the first pipeline In this case, deformation or cracks are likely to occur due to deformation of the ground or external pressure from the surrounding ground, and if a gap occurs in the joint due to cracks or the like, water leaks therefrom. For example, if there is a gap in the joint in the sewer pipe, water leaks from the gap, and if the groundwater or earth and sand around the joint infiltrate into the pipe due to this water leak, a cavity is created in the ground, causing the ground to sink. turn into.

  As a water-stopping structure for avoiding such a situation and ensuring water-stopping at the joint, for example, the one described in Patent Document 1 is known. In the water stop structure related to the sewer pipe described in Patent Document 1, the first pipe forming the sewer main pipe and the second pipe connected to the first pipe to form the attachment pipe The water stop member which covers a junction part from the inner surface side is attached to a junction part with a pipe line.

  The water stop member has a fixed portion fixed to the inner surface of the first pipe line, and a cylindrical sleeve formed integrally with the fixed portion. After the water-stopping member is manufactured on the ground, it is carried into the first pipe line (that is, the sewer main) using a self-propelled robot in a state where the fixed portion is deformed, and then the tubular sleeve is 2 is inserted into the mounting pipe, which is the pipe 2, and the fixing part is heated and pressurized along the inner surface of the first pipe so that the shape of the fixing part is restored to the state before the deformation. Attach to the inner peripheral surface.

JP 2008-202613 A

  The water stop member described in Patent Document 1 is formed to have a size in which the outer diameter of each of the fixed portion and the cylindrical sleeve is matched to the inner peripheral surface of each of the first pipe line and the second pipe line, The coupling angle between the fixed portion and the cylindrical sleeve is set in accordance with the intersecting angle of the second pipeline with respect to the first pipeline. In this way, by determining the shape of the water-stopping member according to the shape of the pipe line to be attached and manufacturing the water-stopping member that matches the pipe shape, the adhesiveness of the water-stopping member is improved and the water-stopping property is excellent. Structure.

  However, since the shape of the joint portion between the first pipe line and the second pipe line is various, it is necessary to manufacture a water stop member having a different shape each time in order to cope with these. Therefore, the water stop member of Patent Document 1 has a problem that versatility is low and costs are high. Further, when the water stop member is attached, it is necessary to fix the water stop member in the pipe while suppressing the drop off of the water stop member, so that there is a problem that the operation by the self-propelled robot becomes complicated.

  The present invention has been made in view of the above problems, and is a water-stop method and a water-stopping method at a joint portion between a first pipe buried in the ground and a second pipe branched from the pipe. It is a water structure, can easily correspond to various pipe diameters and shapes of the first pipe line and the second pipe line, and provides a water stop method and a water stop structure excellent in workability. Objective.

In order to achieve the above object, the water stop method according to claim 1 is:
A water stop construction method for applying a water stop treatment to a joint portion between a first pipe buried in the ground and a second pipe branched from the first pipe,
A resin composition that is cured with time on the inner peripheral surface of each of the first pipe line and the second pipe line, and is bonded to the joint portion of the first pipe line and the second pipe line. It includes spraying so as to straddle both, and including a waterstop layer forming step of forming a waterstop layer on the inner peripheral surface by curing of the resin composition.

  According to this configuration, the resin composition is sprayed on the inner peripheral surface of the joint so as to straddle both the first pipe line and the second pipe line, and the resin composition is cured with time. As a result, a water stop layer is formed along the shapes of the first and second pipelines, so that the pipe diameters and shapes of the first and second pipelines are formed in the pipeline. The corresponding water stop layer can be easily formed, and is excellent in versatility and workability.

Further, the invention according to claim 2 is the water stop construction method according to claim 1,
After the water blocking layer forming step, a rehabilitation pipe is installed on the inner peripheral surface of the first pipe line and / or the second pipe line, and the rehabilitation pipe covers the inner surface of the water blocking layer. Including rehabilitation pipe installation process for pipes

  According to this structure, the rehabilitation pipe can improve the water tightness of the joint portion by improving the adhesion of the water stop layer. In addition, the rehabilitation pipe improves the stability of the water stop layer with respect to the first and second pipe lines, and can prevent the water stop layer from peeling off from the inner surface of the pipe line. Furthermore, since the boundary portion between the formation region and the non-formation region of the water blocking layer is covered with the rehabilitation pipe, it is possible to accurately prevent the entry of groundwater or the like from this boundary portion.

Moreover, in invention of Claim 3, in the water stop construction method of Claim 1 or 2,
The resin composition is a polyurea-forming resin composition or a polyurethane-forming resin composition.

  According to this configuration, polyurea and polyurethane are excellent in water-stopping properties, and are also excellent in abrasion resistance, acid resistance, and alkali resistance, so that they are useful for pipes through which a lot of solids flow or chemical drainage flows. An aqueous layer can be formed.

Moreover, invention of Claim 4 is the water stop construction method of any one of Claims 1-3,
The first pipeline is a sewer main,
The second pipe line is a mounting pipe or a manhole connecting the ground-side dredger and the sewer main pipe.

  According to this configuration, it is possible to easily form a water-stopping layer having a high water-stopping property at the joint portion between the sewer main pipe and the attachment pipe or the manhole.

Moreover, in invention of Claim 5, in the water stop construction method of any one of Claims 1-4,
Of the first pipeline and the second pipeline, an end of one pipeline is connected to the peripheral surface of the other pipeline,
The water blocking layer includes a cylindrical portion that covers the inner peripheral surface of the one pipe line, and a flange that extends radially from one end of the cylindrical part and covers the inner peripheral surface of the other pipe line. It is characterized by having.

  According to this configuration, a water-stopping layer having a high water-stopping property can be easily formed at the joint portion between the first pipe line and the second pipe line.

The water stop structure according to claim 6 is:
A water stop structure at a joint between the first pipe buried in the ground and the second pipe branched from the first pipe;
Over time, formed on the inner peripheral surface of each of the first pipe line and the second pipe line and on the joint portion across both the first pipe line and the second pipe line. It has the water-stopping layer which consists of a hardened | cured material of the resin composition hardened | cured automatically.

  According to this configuration, the water-stopping layer formed on the inner peripheral surface of the joint portion between the first pipe line and the second pipe line is made of the cured product of the resin composition that is cured with time. The water stop layer corresponding to the pipe diameter and the shape of the second pipe line and the second pipe line can be easily formed, and is excellent in versatility and workability.

  According to the water stop construction method and the water stop structure of the present invention, the water stop layer with high adhesion conforming to various shapes regardless of the diameters of the first and second pipes and the shape of the connecting portion. Can be easily formed, and is excellent in versatility and workability. Moreover, the water-stopping layer can accurately prevent water leakage occurring at the joint and its vicinity.

Sectional drawing which shows typically the sewer pipe line which has the water stop structure which is the 1st Embodiment of this invention. It is a principal part enlarged view of FIG. 1, Comprising: The figure which shows the water stop structure of the junction part of a sewer main and an attachment pipe. The perspective view of a water stop layer. The figure explaining the formation process of a water stop layer. The principal part enlarged view of FIG. The figure explaining the installation process of the rehabilitation pipe for sewer mains. The principal part enlarged view which shows the connection part of the sewer main and the attachment pipe in the state which installed the rehabilitation pipe for sewer mains. Sectional drawing which shows typically the sewer pipe line which has the water stop structure which is the 2nd Embodiment of this invention.

(First embodiment)
FIG. 1 is a cross-sectional view schematically showing a sewer pipe having a water stop structure 10 according to the first embodiment of the present invention. In addition, the figure used for description of this invention emphasizes and shows the principal part, and does not show an actual dimensional ratio. In the present embodiment, the water stop structure 10 is applied to a joint portion between the sewer main 20 that is the first pipe and the attachment pipe 30 that is the second pipe that branches from the sewer main 20. When repairing each of the existing sewer main pipe 20 and the attachment pipe 30 with a lining material, it is applied in order to ensure water-stopping at the end portions of the sewer main pipe 20 and the attachment pipe 30 that become a joint portion.

  As illustrated, the sewer main 20 is disposed between two manholes 50-1 and 50-2 embedded in the ground so as to communicate with each other. The attachment pipe 30 is a pipe that connects the sewer main 20 and the dredging 38 installed on the ground side, and discharges the sewage in the dredging 38 into the sewer main 20, and one end of the fitting pipe 30 is connected to the sewer main. It is joined to the peripheral surface of the tube 20. The manholes 50-1 and 50-2, the sewer main pipe 20, and the attachment pipe 30 are pipes each having a substantially circular cross section, and the inner diameter of the attachment pipe 30 is smaller than the inner diameter of the sewer main pipe 20.

  FIG. 2 is a cross-sectional view showing the water stop structure 10 at the joint between the sewer main 20 and the attachment pipe 30. The water stop structure 10 includes a water stop layer 40 formed on the inner peripheral surface side of the sewer main pipe 20 and the attachment pipe 30.

  FIG. 3 is a perspective view of the water blocking layer 40. The water blocking layer 40 has a substantially cylindrical tubular portion 42 that covers the inner peripheral surface of the attachment pipe 30 in the vicinity of the sewer main 20, and a bowl shape that covers the inner peripheral surface of the sewer main 20 in the vicinity of the attachment pipe 30. Part 44. The bowl-shaped portion 44 has a curved surface shape that extends radially from one end of the tubular portion 42 and is curved so as to follow the inner surface shape of the sewer main 20. The cylindrical part 42 and the bowl-shaped part 44 are formed to have a substantially uniform thickness, and the thickness is about 0.5 to 5 mm, more preferably about 1 to 2 mm.

  The shortest length H in the axial direction of the tubular portion 42 and the shortest length L from the inner edge portion to the outer edge portion of the flange-like portion 44 can be appropriately selected according to the size of the pipe to be repaired. Advantageously, it is at least about 5 cm. The axial length H of the cylindrical part 42 and the length L of the flanged part 44 are, for example, about 5 to 30 cm, and more preferably 15 cm or more.

  The water blocking layer 40 is formed of a cured product of a resin composition that is cured over time. As such a resin composition, for example, a polyurea forming resin composition or a polyurethane forming resin composition can be used. Polyurea and polyurethane are excellent in acid resistance, alkali resistance, chemical resistance, and abrasion resistance, and polyurea is particularly preferable because it has a fast curing time and excellent chemical resistance. In the present embodiment, the water blocking layer 40 is formed of polyurea that is a cured product.

  The water stop structure 10 further has a coating layer formed on the inner surface side of the water stop layer 40. The covering layer includes a sewer main rehabilitation pipe (rehabilitation pipe in the first pipe line) 25 that covers the bowl-shaped part 44, and a mounting pipe rehabilitation pipe (rehabilitation pipe in the second pipe line) 35 that covers the tubular part 42. It is formed by.

  The sewer main pipe rehabilitation pipe 25 and the attachment pipe rehabilitation pipe 35 are each formed of a lining material. The lining material is used to rehabilitate existing pipes, here, the sewer main pipe 20 and the attachment pipe 30. Such a lining material is conventionally used, for example, a fiber base material (for example, a nonwoven fabric such as glass fiber mat or felt) impregnated with a curable resin composition, and if necessary, What has the inner film and outer film which protect the inner surface and outer surface of the tubular thing can be used.

  As an inner film and an outer film, a polyethylene film, a polypropylene film, a polyethylene terephthalate film etc. can be used, for example. When the curable resin composition constituting the lining material is a photocurable resin composition, an inner film having transparency to the irradiated light is used. The inner film is peeled off after the lining material is cured.

  The rehabilitation pipe 25 for the sewer main is disposed over the entire inner peripheral surface of the sewer main 20 disposed between the two manholes 50-1 and 50-2. The attachment pipe rehabilitation pipe 35 is disposed over the entire inner peripheral surface of the attachment pipe 30 disposed between the sewer main pipe 20 and the trough 38.

  Next, the construction method of the pipe line which has the water stop structure 10 mentioned above is demonstrated.

  FIG. 4 is a diagram illustrating a process of forming the water blocking layer 40. During the operation, packers 78-1 and 78-2 are arranged in the sewer main to block the flow of sewage. As shown in the figure, first, the injection device 60 is introduced from one manhole 50-1 into the sewer main 20 and disposed near the joint between the sewer main 20 and the attachment pipe 30.

  As shown in FIG. 5, the injection device 60 is provided at a body portion 62 configured to be movable by a wheel 61, a rod-shaped shaft portion 64 supported by the body portion 62, and a tip of the shaft portion 64. And a nozzle portion 66. The shaft portion 64 is supported so as to be rotatable around the shaft. A supply device 70 disposed on the ground is connected to the injection device 60 via a hose and cable assembly 74. The supply device 70 includes a container 71 that contains a primer, and containers 72A and 72B that individually contain a first liquid and a second liquid that are components of the resin composition forming the water blocking layer 40, A compressor 73 that pumps gas is connected. In the present embodiment, the first liquid contained in the container 72A is a polyamine component, and the second liquid contained in the container 72B is a polyisocyanate component.

  Next, a primer is sprayed from the injection device 60 onto the inner peripheral surface of the joint portion of the sewer main pipe 20 and the attachment pipe 30 so as to straddle both the sewer main pipe 20 and the attachment pipe 30 (primer treatment). Processing step). The primer is sent to the injection device 60 through the hose and cable assembly 74 together with the compressed air by the supply device 40 and is injected from the nozzle portion 66 provided in the injection device 60. For example, an epoxy resin can be used as the primer. Such application of the primer is performed on the inner peripheral surfaces of the sewer main pipe 20 and the attachment pipe 30 as necessary in order to improve the adhesiveness of the resin composition to be the water blocking layer 40.

  After the primer treatment, a resin composition that is cured with time is sprayed from the spray device 60, and the resin composition is cured to form the water blocking layer 40 (water blocking layer forming step). This resin composition is produced by mixing the first liquid and the second liquid accommodated in the containers 72A and 72B. In the present embodiment, the first liquid and the second liquid are individually sent to the injection device 60 together with the compressed air from the supply device 70 through the hose / cable assembly 74, and the two liquids are discharged by the nozzle portion 66 immediately before the injection. Are mixed. Mixing of the first liquid and the second liquid is further promoted by jetting. The resin composition applied to both the sewer main pipe 20 and the mounting pipe 30 on the inner peripheral surface of the joint portion of the sewer main pipe 20 and the mounting pipe 30 is cured over time, and the water stop layer 40 is formed. Form.

  In the present embodiment, the injection port 66a provided in the nozzle portion 66 is configured such that the injection angle can be adjusted by an angle adjustment mechanism (not shown). In the present embodiment, as shown in FIG. 5, the angle α of the injection port 66a with respect to the axial direction C of the shaft portion 64 (here, the same as the axial direction of the sewer main 20) (the center of the axial center C and the injection port 66a). The angle with respect to the injection direction of the resin composition released from the resin can be adjusted. Note that the range of the angle α can be set as appropriate according to the use situation, for example, 0 ° <α <180 °. Thus, by making the injection angle adjustable, the resin composition forming the water blocking layer 40 injected from the injection port 66a reaches the inner peripheral surface of the sewer main pipe 20 or the attachment pipe 30. It is possible to adjust the distance, adjust the mixing time of the first liquid and the second liquid during injection, and prevent the resin composition from curing before reaching the inner peripheral surface. The thickness of the primer and the water blocking layer 40 can be made uniform.

  After the water blocking layer 40 is formed, the sewer main rehabilitation pipe 25 is installed on the inner peripheral surface of the sewer main 20 (first rehabilitation pipe installation process for the pipeline). As shown in FIG. 6, in the main pipe rehabilitation pipe installation step, a tubular sewer lining material 26 is first introduced into the sewer main pipe 20. Next, both ends of the lining material 26 for the sewer main pipe are closed with the closing members 82-1 and 82-2 to form the closed space 85, and the working device 81 arranged on the ground is connected to the inside of the closed space 79 through the hose 84. Compressed air is introduced. Thereby, the diameter of the lining material 26 for the sewer main is expanded, and the outer peripheral surface thereof is brought into contact with the inner peripheral surface of the sewer main 20 and the inner surface of the bowl-shaped portion 44 of the water blocking layer 40.

  Thereafter, the lining material 26 for the sewer main pipe is irradiated with light from the inside by the lamp coupling body 86 to cure the curable resin composition contained in the lining material 26 for the sewer main pipe. The lamp coupling body 86 can be moved in the sewer lining material 26 by being pulled by the cable 87. Thereby, the lining material 26 for sewer mains hardens over the whole area.

  Thereafter, the lamp coupling body 86 is removed, and the tube opening treatment is performed on both ends of the cured sewer lining material 26. Further, as shown in FIG. 7, the hardened sewer lining material 26 is cut off at the joint portion between the sewer main pipe 20 and the attachment pipe 30 in accordance with the opening shape of the pipe. In addition, excision of the lining material 26 for sewer mains in the joint portion is performed by a conventional method, for example, a movable cutting machine is disposed inside the cured lining material 26 for sewer mains and moved to the connection portion. Thereafter, the lining material 26 for the sewer main pipe after being cured with a cutter of a cutting machine can be cut into a circle. Thereby, the rehabilitation pipe 25 for the sewer main is installed inside the sewer main 20.

  In addition, in the installation process of the sewer main pipe rehabilitation pipe 25, the work device 81 enters the closed space 85 via the hose 84 so that an air flow is formed from one end side to the other end side of the sewer main pipe lining material 26. The supplied air is discharged from the ground working device 89 to the outside through the hose 88. Thereby, discharge | emission of a combustible substance is performed.

  Next, the attachment pipe rehabilitation pipe 35 is installed on the inner peripheral surface of the attachment pipe 30 (second pipe rehabilitation pipe installation step). This installation work can be performed by a conventional method. For example, first, the lining material for the mounting pipe that forms the rehabilitation pipe 35 for the mounting pipe is introduced into the mounting pipe 30 in a folded state. Next, a gas such as air is introduced into the mounting pipe lining material, and the outer peripheral surface of the tubular mounting pipe lining material is brought into close contact with the inner peripheral surface of the mounting pipe 30. The attachment pipe lining material covers the inner surface of the tubular portion 42 of the water blocking layer 40 at the end of the attachment pipe 30 on the sewer main pipe 20 side. In this state, the mounting pipe lining material is cured by light. Thereafter, pipe opening treatment is performed at both ends of the cured mounting pipe lining material. In addition, the thickness of the rehabilitation pipe | tube 35 for attachment pipes is suitably selected according to the pipe diameter etc. of the attachment pipe | tube 30 used as repair object. Thereby, the pipe line in which the rehabilitation pipe | tube 35 for attachment pipes shown in FIG.1 and FIG.2 was installed is formed.

  In the above method, the lining material 26 for the sewer main pipe and the lining material for the mounting pipe are impregnated with a light curable resin composition that is cured by light. However, a thermosetting resin composition that is cured by heat is used. It may be impregnated. In the case of a photocurable resin composition, a photopolymerization initiator such as an azo compound is blended. In the case of a thermosetting resin composition, an organic peroxide that reacts with heat is blended. Any curable resin composition can be used in which a polymerizable resin such as a vinyl ester resin or an unsaturated polyester resin is dissolved in a solvent such as styrene. When the thermosetting resin composition is used, the curing operation is not performed by light irradiation but by heating the lining material.

  In the pipe line having the water stop structure 10 formed by the construction method described above, the rehabilitation pipe 25 for the sewer main pipe and the rehabilitation pipe 35 for the attachment pipe are respectively connected to the sewer main pipe 20 and the attachment pipe 30 and in the vicinity thereof. It is installed in close contact with each of the sewer main 20 and the attachment pipe 30 via the water blocking layer 40. Further, as shown in the figure, the boundary 44a on the sewer main 20 side of the water stop layer 40 is covered with the rehabilitation pipe 25 for the sewer main, and the boundary 42a on the attachment pipe 30 side of the water stop layer 40 is attached. It is covered with a pipe rehabilitation pipe 35.

  In the construction method described above, as a method for forming the water blocking layer 40, a liquid resin composition is sprayed and applied to the joint portion of the pipeline and the inner peripheral surface in the vicinity thereof, and the resin composition is cured. Regardless of the shape of the sewer main pipe 20 and the mounting pipe 30, the water stop layer 40 with high adhesion having a shape suitable for the internal shape of the sewer main pipe 20 and the mounting pipe 30 is easily formed at the construction site. be able to. Further, as this resin composition, a two-component mixed resin composition that begins to harden by mixing the first and second liquids is used, and since the curing speed thereof is relatively fast, It is difficult to be affected by external factors such as air temperature and humidity in the pipeline during construction, and it is possible to ensure predetermined physical properties in the water blocking layer 40.

  Moreover, since the cylindrical part 42 and the collar upper part 44 of the water-stopping layer 40 are formed in series without a seam, the water-stopping effect at the joint is high. Furthermore, by forming the water blocking layer 40 only at the joint and its peripheral part as in the present embodiment, it is possible to perform an appropriate water leakage prevention treatment at a necessary place without reducing the inner diameter of the entire pipeline. The construction time can be shortened and the cost can be reduced.

  In addition, since the sewer main rehabilitation pipe 25 and the attachment pipe rehabilitation pipe 35 are installed on the inner surface side of the water stop layer 40, the mounting stability of the water stop layer 40 on the inner surface of the sewer main pipe 20 and the attachment pipe 30 is improved. In addition, the water blocking layer 40 is prevented from being peeled off from the inner surfaces of the sewer main pipe 20 and the attachment pipe 30 and falling. For example, when the earth covering at the junction of the sewer main 20 and the attachment pipe 30 is shallow and the junction is relatively close to the ground surface, the ground around the junction is affected by the vehicle traveling on the ground surface. Deforms and a dynamic load due to ground deformation acts on the joint. In the case where the mounting stability of the water blocking layer 40 is low, the water blocking layer 40 may fall into the pipeline due to the influence of this load, but the rehabilitation is performed on at least one of the sewer main pipe 20 and the mounting pipe 30. By providing the pipe and covering the water stop layer 40 from the inner surface side, the water stop layer 40 is stably fixed and falling is prevented.

  Moreover, workability can be improved compared with the thing of a polyurethane by forming the water stop layer 40 with a polyurea. More specifically, since the polyurethane-forming resin composition is easily affected by humidity when it is cured, it is necessary to sufficiently dry the inner surfaces of the sewer main pipe 20 and the attachment pipe 30 before being cured by injection. However, since the polyurea forming resin composition is not easily affected by humidity, it can be applied even when the inner surface of the pipe is wet. At the time of repairing the sewage pipe, water droplets may adhere to the pipe due to water from the surrounding ground, and it is particularly preferable to use a polyurea forming resin composition.

(Second Embodiment)
FIG. 8 is a cross-sectional view schematically showing a sewer pipe having the water stop structure 10 of the second embodiment. In FIG. 8, parts corresponding to those in the first embodiment are denoted by the same reference numerals. In the second embodiment described below, detailed description of the same configuration as that of the first embodiment is omitted.

  The water stop structure 10 according to the present embodiment includes a manhole (second pipe) 50 buried in the ground in a sewer pipe, and a sewer main pipe that branches from the manhole 50 and has an inner diameter smaller than that of the manhole 50 ( (First pipe line) 20-1 and 20-2 are applied to each joint. One end portions of the sewer mains 20-1 and 20-2 are joined to the peripheral surface of the manhole 50, and the manhole 50 and the sewer main are provided on the inner peripheral surface of the joint portion between the manhole 50 and the sewer main 20-1. 20-1 is formed across both the manhole 50 and the sewer main 20-2 on the inner peripheral surface of the joint between the manhole 50 and the sewer main 20-2. An aqueous layer 40-2 is formed.

  The water blocking layers 40-1 and 40-2 are formed of a cured product of a resin composition that cures with time (for example, a resin composition for forming a polyurea or a resin composition for forming a polyurethane). -1 and 20-2 have a substantially cylindrical tubular portion 42 covering the inner peripheral surface in the vicinity of the manhole 50 and a hook-shaped portion 44 covering the inner peripheral surface in the vicinity of the sewer main 20 of the manhole 50. The bowl-shaped portion 44 has a curved surface shape that extends radially from one end of the tubular portion 42 and is curved so as to follow the inner surface shape of the manhole 50. As in the first embodiment, the thickness and length of the cylindrical portion 42 and the flange-like portion 44 can be appropriately selected according to the shape of the pipeline. Note that the lower end of the bowl-shaped portion 44 preferably extends to the bottom of the manhole 50.

  The water stop structure 10 further has a coating layer formed on the inner surface side of the water stop layers 40-1 and 40-2. The covering layers are the sewer main rehabilitation pipes (rehabilitation pipes in the first pipe line) 25-1 and 25-2 that cover the tubular portions 42 of the water blocking layers 40-1 and 40-2, It is formed by a manhole rehabilitation pipe (second pipe rehabilitation pipe) 55 that covers the bowl-shaped portions 42 of the water layers 40-1 and 40-2. The sewer main rehabilitation pipes 25-1 and 25-2 cover the entire inner peripheral surface of the sewer main pipes 20-1 and 20-2, and the manhole rehabilitation pipe 55 is included in the manhole 50 including the bottom 51. Cover the entire circumference. The lining material which forms each rehabilitation pipe | tube 25-1, 25-2, 55 can use what was used conventionally.

  Such a water stop structure 10 is formed by the following method. In addition, in the following description, although the construction method of the water stop structure 10 in the connection part of one sewer main 20-1 and the manhole 50 is demonstrated, the other sewer main 20-2 and the manhole 50 are demonstrated. The construction method in the connection portion is the same as this.

  First, the injection device 60 is introduced into the manhole 50 and disposed near the junction with the sewer main 20-1. Next, a primer is injected from the nozzle part 66 of the injection device 60, and the primer is straddled across both the manhole 50 and the sewer main 20-1 on the inner peripheral surface of the joint part of the manhole 50 and the sewer main 20-1. Apply (primer treatment step).

  Then, the resin composition which forms the water stop layer 40-1 is sprayed and applied from the nozzle part 66 to the inner peripheral surface of the pipeline subjected to the primer treatment, and the resin composition is cured (water stop). Layer forming step). Note that the same primer and resin composition as those in the first embodiment can be used. That is, the resin composition forming the water blocking layer 40-1 is a mixture of the first liquid and the second liquid immediately before jetting, and the mixing is promoted by jetting.

  After the water blocking layer 40-1 is formed, the rehabilitation pipe 25-1 for the sewer main is installed on the inner peripheral surface of the sewer main 20-1 (first rehabilitation pipe installation process for the pipeline). The installation process of the sewer main pipe rehabilitation pipe 25-1 can be performed by the same method as in the first embodiment.

  Next, the manhole rehabilitation pipe 55 is installed in the manhole 50 (second pipe rehabilitation pipe installation process). This installation work can be performed by a conventional method. For example, first, a manhole lining material is introduced into the manhole 50, a fluid such as air is introduced into the manhole 50, and the opposite circumferential surface of the bottomed tubular manhole lining material is made the inner circumferential surface of the manhole 50 by the pressure of the fluid. Adhere to. In the vicinity of the junction with the sewer main 20-1, the lining material for manhole covers the inner surface of the bowl-shaped portion 44 of the water blocking layer 40-1. In this state, the manhole lining material is cured by light. Then, the pipe opening process of the hardened lining material for manholes (namely, the rehabilitation pipe | tube 55 for manholes) is performed in a junction part with the sewer main 20-1.

  In the above-described embodiment, by providing the water-stopping layers 40-1 and 40-2, the water-stopping at the junction between the manhole 50 and the sewer mains 20-1 and 20-2 and in the vicinity thereof is increased, and groundwater or the like Water leakage can be prevented. Moreover, since the water-stopping layers 40-1 and 40-2 are formed by applying a liquid resin composition to the inner surface of the pipeline and curing it, the manhole 50 and the sewer mains 20-1 and 20 The water-stopping layers 40-1 and 40-2 suitable for various pipe line shapes can be easily formed. Further, the manhole rehabilitation pipe 55 and the sewer main rehabilitation pipes 25-1 and 25-2 form a coating layer that covers the inside of the water stop layers 40-1 and 40-2. Is expensive.

  The present invention is not limited to the first and second embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, in the first embodiment, the sewer main pipe rehabilitation pipe 25 may be installed after the attachment pipe rehabilitation pipe 35 is installed. In the second embodiment, the manhole rehabilitation pipe 55 is installed and then the sewer system. A main pipe rehabilitation pipe 25 may be provided.

  In addition, the pipe line to which the water stop structure is applied is not limited to a pipe line through which sewage flows, and may be applied to, for example, a joint part between an agricultural water pipe, an industrial water pipe, and the pipe connected thereto. it can. Furthermore, the water stop layer according to the present invention is not limited to the one provided when the rehabilitation pipe is installed, and may be formed when a new pipe line is formed (that is, a pipe line where the rehabilitation pipe is not installed). .

10 Water stop structure 20 Sewer main (first pipe)
25 Rehabilitation pipe for sewer main 30 Mounting pipe (second pipe)
35 Rehabilitation pipe for mounting pipe 38 桝 40 Water blocking layer 42 Cylindrical part 44 鍔 part 50 Manhole (second pipe)
55 Rehabilitation pipe for manhole

Claims (6)

A water stop construction method for applying a water stop treatment to a joint portion between a first pipe buried in the ground and a second pipe branched from the first pipe,
A resin composition that is cured with time on the inner peripheral surface of each of the first pipe line and the second pipe line, and is bonded to the joint portion of the first pipe line and the second pipe line. A waterstop construction method comprising a waterstop layer forming step of spraying the resin composition so as to straddle both and forming a waterstop layer on the inner peripheral surface by curing of the resin composition.   After the water blocking layer forming step, a rehabilitation pipe is provided on the inner peripheral surface of the first pipe line and / or the second pipe line, and the rehabilitation pipe covers the inner surface of the water blocking layer. The water stop construction method according to claim 1, further comprising an installation step.   The water stopping method according to claim 1 or 2, wherein the resin composition is a polyurea forming resin composition or a polyurethane forming resin composition. The first pipeline is a sewer main,
The water stop construction method according to any one of claims 1 to 3, wherein the second pipe line is an attachment pipe or a manhole connecting a ground-side dredger and the sewer main pipe. Of the first pipeline and the second pipeline, the end of one pipeline is joined to the peripheral surface of the other pipeline,
The water blocking layer includes a cylindrical portion that covers the inner peripheral surface of the one pipe line, and a flange that extends radially from one end of the cylindrical part and covers the inner peripheral surface of the other pipe line. The water stop construction method according to claim 1, wherein the water stop construction method is provided. A water stop structure at a joint between the first pipe buried in the ground and the second pipe branched from the first pipe;
Over time, formed on the inner peripheral surface of each of the first pipe line and the second pipe line and on the joint portion across both the first pipe line and the second pipe line. A water-stopping structure comprising a water-stopping layer made of a cured product of a resin composition that cures automatically.

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