JP2017210841A - Method and structure for regenerating existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for regenerating existing pipe that forms a rehabilitation pipe inside an existing pipe without stopping water for a long time.SOLUTION: A method for regenerating existing pipe comprises: the step S1 of installing an auxiliary pipe 6 with the space with an existing pipe 2 sealed, inside the existing pipe 2 and on one side A of a manhole 4; the step S2 of installing a guiding pipe 9 slidable with respect to the existing pipe 2 and with the space with the existing pipe 2 sealed, inside the existing pipe 2 and on the other side B of the manhole 4; the step S3 of making a space 4A around a by-pass pipe 12 of the manhole 4 in a low wet state by installing the by-pass pipe 12 extending across the manhole 4 and with one end side sealed to the auxiliary pipe 6 and the other end side sealed to the guiding pipe 9; the step S4 of assembling a cylindrical member 3A for a rehabilitation pipe 3 in the space 4A and connecting the cylindrical member with the guiding pipe 9; and the step 5 of moving the guiding pipe 9 with the cylindrical member 3A in the rehabilitation pipe extension direction as the guiding pipe 9 is sealed to the by-pass pipe 12 and the existing pipe 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an existing pipe rehabilitation method and a rehabilitation structure for an existing pipe for installing a rehabilitation pipe inside a wet existing pipe buried in the ground with a manhole.

  Conventionally, in existing sewers, when existing pipes made of reinforced concrete pipes (fume pipes) are aging and there is a risk of water leakage or collapse, there is a known method for rehabilitating existing pipes to form new rehabilitation pipes in the existing pipes. Yes. In this existing pipe rehabilitation method, for example, the existing pipe is rehabilitated by filling a backfill grout between the rehabilitation pipe and the existing pipe.

  The following Patent Document 1 proposes a rehabilitation method for rehabilitating an existing pipe between two manholes. In the rehabilitation method of Patent Document 1, first, a leading pipe is installed from one manhole to the inside of an existing pipe. Thereafter, in this rehabilitation method, when the leading conduit is pulled from the other manhole using a wire, a cylindrical member is sequentially connected to the rear end portion in the pulling direction of the leading conduit to form a rehabilitating tube.

JP 2013-032632 A

  In the rehabilitation method disclosed in Patent Document 1, an operation of sequentially connecting the cylindrical members in the space at one manhole position is performed. In general, since sewage and the like flow in the existing pipe and the space of the manhole position, they are in a wet state. Even in the wet state, if the amount of water is small, the above work can be performed in the space of the manhole position, but there is a problem that the work efficiency is lowered. Also, work in a wet state can be very dangerous if the amount of water changes abruptly during the work.

  For this reason, conventionally, when performing the operation as described in Patent Document 1 at the manhole position, the upstream side of the sewage or the like flowing into one manhole position is stopped, and the space at the manhole position is in a low wet state. . Here, the low wet state means a dry state or a state in which a small amount of water flows.

  However, in order to stop the upstream side of the manhole position for a long time, it is necessary to bypass the sewage while stopping the water to another existing pipe, which requires a lot of time and labor to form the bypass. It was. In addition, when releasing the water stoppage, a large amount of sewage flows at a time, so that the downstream side may be in a dangerous state.

  The present invention has been devised in view of the actual situation as described above. Based on the installation of a bypass pipe extending across the manhole, a rehabilitation pipe is formed inside an existing pipe without stopping for a long time. The main purpose is to provide a method for rehabilitating existing pipes.

  The present invention is a method for rehabilitating an existing pipe for installing a rehabilitated pipe inside a wet existing pipe buried in the ground with a manhole, wherein the rehabilitating method for the existing pipe and the manhole A step of installing an auxiliary pipe sealed to the existing pipe on one side in the longitudinal direction of the pipe, and the existing pipe inside the existing pipe and on the other side in the longitudinal direction of the pipe with respect to the manhole. A step of installing a leading conduit that is slidable and sealed between the existing pipe, and extending across the manhole, and having one end sealed on the auxiliary tube and the other end sealed on the leading conduit. Providing a low-wetting space around the bypass pipe in the manhole by installing a bypass pipe; and assembling a cylindrical member for a rehabilitation pipe in the space and connecting to the leading pipe; In a state where the destination conduit sealed to said bypass pipe and said existing pipe, said destination conduit with said cylindrical member, characterized in that it comprises a step of moving the rehabilitating pipe extending direction.

  In the method for rehabilitating the existing pipe according to the present invention, the gap between the existing pipe and the auxiliary pipe is sealed by a first sealing portion installed in the auxiliary pipe, and the gap between the existing pipe and the leading pipe is Sealed by a second sealing part installed in the leading pipe, and between the auxiliary pipe and the leading pipe and the bypass pipe, a third sealing part installed on one end side and the other end side of the bypass pipe, respectively. And it is desirable to be sealed by the fourth sealing portion.

  In the existing pipe rehabilitation method according to the present invention, the first sealing portion, the second sealing portion, the third sealing portion, and the fourth sealing portion are sealed with air and sealed by their air pressure. It is desirable.

  In the method for rehabilitating an existing pipe according to the present invention, the leading conduit is moved in a rehabilitation pipe extending direction by being pulled by a wire from another manhole located on the other side of the pipe longitudinal direction with respect to the manhole. It is desirable.

  The present invention is a rehabilitation structure of an existing pipe including an existing pipe buried in the ground with a manhole, and a rehabilitation pipe installed inside the existing pipe, the interior of the existing pipe and the manhole An auxiliary pipe installed on one side in the longitudinal direction of the pipe, a tip pipe installed on the other side in the longitudinal direction of the pipe inside the existing pipe and the manhole, and extending across the manhole, One end side is included in the auxiliary pipe, and the other end side includes a bypass pipe installed in the leading conduit, and the rehabilitation pipe connected to the leading conduit.

  In the rehabilitation structure of an existing pipe according to the present invention, the auxiliary pipe has a first sealing portion that seals between the existing pipe and the auxiliary pipe, and the leading pipe includes the existing pipe and the leading pipe. Preferably, the bypass pipe has a third sealing part and a fourth sealing part for sealing between the auxiliary pipe and the leading conduit and the bypass pipe, respectively. .

  The rehabilitation method for an existing pipe according to the present invention extends across the manhole, and by installing a sealed bypass pipe with one end side on the auxiliary pipe and the other end side on the leading conduit, the space around the manhole bypass pipe And a step of assembling a cylindrical member for a rehabilitation pipe in a space and connecting it to a leading conduit.

  Such a rehabilitation method can improve the work efficiency because the work of assembling the cylindrical member can be performed in a low wet state. In addition, the existing pipe rehabilitation method of the present invention does not need to stop the water on the upstream side of the manhole for a long time, eliminates the time and labor involved in the water stop work, and eliminates the water stop state. Downstream hazards can also be avoided.

  Moreover, the rehabilitation method of the existing pipe of the present invention includes a step of moving the front pipe together with the cylindrical member in the direction of extending the rehabilitation pipe in a state where the front pipe is sealed with respect to the bypass pipe and the existing pipe. Such a rehabilitation method can maintain the low wet state of the space around the bypass pipe of the manhole even when the leading conduit is moved together with the cylindrical member in the rehabilitation pipe extension direction.

  The rehabilitation structure of the existing pipe of the present invention is installed inside the existing pipe and on one side in the longitudinal direction of the pipe with respect to the manhole, and on the other side of the existing pipe and in the longitudinal direction of the pipe with respect to the manhole And a bypass pipe extending across the manhole and having one end on the auxiliary pipe and the other end on the front pipe.

  Such an existing pipe rehabilitation structure can make the space around the bypass pipe of the manhole low in a wet state. For this reason, the rehabilitation structure of the existing pipe of the present invention can improve the work efficiency of the work performed in this space.

It is a conceptual diagram which shows one Embodiment of the rehabilitation structure of the existing pipe | tube of this invention. It is a perspective view which shows notionally the assembly state of a rehabilitation pipe | tube. It is an expanded sectional view by the side of an auxiliary pipe. It is an expanded sectional view by the side of a previous conduit. It is a flowchart which shows one Embodiment of the rehabilitation method of the existing pipe | tube of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an existing pipe rehabilitation structure 1 according to this embodiment. As shown in FIG. 1, the existing pipe rehabilitation structure 1 of this embodiment includes an existing pipe 2 buried in the ground and a rehabilitation pipe 3 installed inside the existing pipe 2.

  The existing pipe 2 of this embodiment is a sewer made of a reinforced concrete pipe. The existing pipe 2 has, for example, sewage D flowing therein. The existing pipe 2 has a plurality of manholes 4 and preferably communicates with the ground via the manholes 4. The existing pipe 2 has a slightly large space 4A at the manhole 4 position. This space 4A is suitable for assembling the rehabilitation pipe 3 and the like as will be described later.

  The rehabilitation pipe 3 according to the present embodiment is formed by sequentially assembling and connecting a plurality of cylindrical members 3A for the rehabilitation pipes 3 in the space 4A at the manhole 4 position.

  FIG. 2 is a perspective view conceptually showing an assembled state of the rehabilitation pipe 3. As shown in FIG. 2, each cylindrical member 3 </ b> A for the rehabilitation pipe 3 has a plurality of, in this embodiment, four segments 3 a to 3 d, and a plurality of fastening members 5 a (only a part is shown in FIG. 2). It is assembled in a cylindrical shape by being fastened by. Such assembly is preferably performed in the space 4A around the bypass pipe 12 of the manhole 4 (shown in FIG. 1), as will be described later. The rehabilitation pipe 3 is formed, for example, by connecting a plurality of cylindrical members 3A assembled in this way to each other by a plurality of fastening members 5b (only a part is shown in FIG. 2).

  As shown in FIG. 1, the existing pipe rehabilitation structure 1 of the present embodiment includes an auxiliary pipe 6 that is installed inside the existing pipe 2 and on one side A in the longitudinal direction of the pipe with respect to the manhole 4.

  FIG. 3 is an enlarged cross-sectional view of the auxiliary pipe 6 side. As shown in FIG. 3, the auxiliary pipe 6 includes a plurality of, in this embodiment, three cylindrical members 6A for the auxiliary pipe 6 and an auxiliary ring 6B connected to one side A of the cylindrical member 6A. It is out.

  The cylindrical member 6A for the auxiliary pipe 6 of the present embodiment is the same as the cylindrical member 3A for the rehabilitated pipe 3. As with the cylindrical member 3A for the rehabilitation pipe 3, the cylindrical member 6A is desirably assembled into a cylindrical shape by fastening a plurality of segments. Each cylindrical member 6A for the auxiliary pipe 6 is connected to each other by, for example, a plurality of fastening members 5c.

  The auxiliary ring 6B is connected to one end side of the cylindrical member 6A for the auxiliary pipe 6 by a plurality of fastening members 5d, for example. Here, the one end side means an end portion on one side A in the tube longitudinal direction of the target object. As with the cylindrical member 3A for the rehabilitation pipe 3, the auxiliary ring 6B is preferably assembled in a cylindrical shape by fastening a plurality of segments.

  The auxiliary ring 6 </ b> B of the auxiliary pipe 6 of the present embodiment has a first sealing portion 7 that seals between the existing pipe 2 and the auxiliary pipe 6. The 1st sealing part 7 is formed in the hollow annular | circular shape with the cloth which has airtightness, for example. The first sealing portion 7 is preferably sealed with high-pressure air inside and seals between the existing pipe 2 and the auxiliary pipe 6 by the air pressure. Such a first sealing portion 7 can prevent sewage D (shown in FIG. 1) or the like from flowing between the existing pipe 2 and the auxiliary pipe 6.

  The auxiliary pipe 6 is preferably fixed to the existing pipe 2 by a plurality of fixing members 8 provided on the other end side of the cylindrical member 6A for the auxiliary pipe 6 and the auxiliary ring 6B. Here, the other end side means an end portion on the other side B in the tube longitudinal direction of the target object.

  As shown in FIG. 1, the existing pipe rehabilitation structure 1 of the present embodiment includes a leading conduit 9 installed on the other side B in the longitudinal direction of the pipe with respect to the manhole 4 inside the existing pipe 2. The leading conduit 9 is pulled by a wire W from another manhole (not shown) positioned on the other side B in the longitudinal direction of the tube with respect to the above-described manhole 4, so that the inside of the existing tube 2 is moved to the other side B. It is installed so that it can move.

  FIG. 4 is an enlarged cross-sectional view of the front conduit 9 side. As shown in FIG. 4, the leading conduit 9 includes a plurality of, in this embodiment, three leading members 9A, a leading ring 9B connected to the other side B of the leading member 9A, and one side A of the leading member 9A. And a cylindrical member 9C for the leading conduit 9 connected to the pipe.

  It is desirable that the leading member 9A of the leading conduit 9 has a cylindrical shape having a diameter larger than that of the cylindrical member 3A for the rehabilitating tube 3 and a small length in the tube longitudinal direction. As with the cylindrical member 3A for the rehabilitation pipe 3, the leading member 9A is preferably assembled into a cylindrical shape by fastening a plurality of segments. Each leading member 9A is connected to each other by, for example, a plurality of fastening members 5e.

  For example, the leading ring 9B is connected to the other end side of the leading member 9A by a plurality of fastening members 5f. As with the cylindrical member 3A for the rehabilitation pipe 3, the leading ring 9B is preferably assembled in a cylindrical shape by fastening a plurality of segments. A pulling wire W is connected to the leading ring 9B of the present embodiment.

  The leading ring 9 </ b> B of the leading conduit 9 of the present embodiment has a second sealing portion 10 that seals between the existing pipe 2 and the leading conduit 9. The 2nd sealing part 10 is formed in the hollow annular | circular shape with the cloth which has airtightness, for example. The second sealing portion 10 is preferably sealed with high-pressure air inside and seals between the existing pipe 2 and the leading conduit 9 by the air pressure. Such a second sealing portion 10 can prevent sewage D (shown in FIG. 1) or the like from flowing between the existing pipe 2 and the leading conduit 9.

  The cylindrical member 9 </ b> C for the tip conduit 9 of the present embodiment is the same as the cylindrical member 3 </ b> A for the rehabilitation pipe 3. The cylindrical member 9C is preferably assembled in a cylindrical shape by fastening a plurality of segments, similarly to the cylindrical member 3A for the rehabilitation pipe 3. The cylindrical member 9C for the leading conduit 9 is connected to one end side of the leading member 9A by a plurality of fastening members 5g, for example. For example, a cylindrical member 3A for the rehabilitation pipe 3 is connected to the cylindrical member 9C for the leading conduit 9 by a plurality of fastening members 5b.

  The leading conduit 9 is preferably installed to be slidable with respect to the existing pipe 2 by a plurality of sliding members 11a respectively provided on the leading ring 9B and the cylindrical member 9C for the leading conduit 9.

  As shown in FIG. 1, the existing pipe rehabilitation structure 1 of the present embodiment includes a bypass pipe 12 extending across the manhole 4 and having one end side installed in the auxiliary pipe 6 and the other end side installed in the leading pipe 9. It is out. Since such a bypass pipe 12 can make the space 4A surrounding the bypass pipe 12 of the manhole 4 into a low wet state, work efficiency of work performed in the space 4A can be improved. Here, the low wet state means a dry state where there is no flowing sewage D or a state where a small amount of sewage D flows.

  The bypass pipe 12 preferably includes a bypass pipe body 12A having a smaller diameter than the cylindrical member 3A of the rehabilitation pipe 3. When the diameter of the bypass pipe main body 12A is smaller than the minimum diameter of the manhole 4, it is desirable that the bypass pipe main body 12A be integrally formed in a cylindrical shape or assembled in advance in a cylindrical shape on the ground. When the bypass pipe main body 12A is formed of an elastic material, the bypass pipe main body 12A may be integrally formed in the length direction thereof. When the diameter of the bypass pipe main body 12A is larger than the minimum diameter of the manhole 4, the bypass pipe main body 12A may be assembled in a cylindrical shape by fastening a plurality of segments, like the cylindrical member 3A for the rehabilitation pipe 3. .

  As shown in FIG. 3, the bypass pipe 12 of the present embodiment connects the first bypass ring 12B to one side A of the bypass pipe main body 12A. As with the cylindrical member 3A for the rehabilitation pipe 3, the first bypass ring 12B is preferably assembled in a cylindrical shape by fastening a plurality of segments. The first bypass ring 12B is desirably connected to one end side of the bypass pipe body 12A by a plurality of fastening members 5h.

  The first bypass ring 12 </ b> B of the bypass pipe 12 of the present embodiment has a third sealing portion 13 that seals between the auxiliary pipe 6 and the bypass pipe 12. The 3rd sealing part 13 is formed in the hollow annular shape with the cloth which has airtightness, for example. The third sealing portion 13 is preferably sealed with high-pressure air inside and seals between the auxiliary pipe 6 and the bypass pipe 12 by the air pressure. Such a third sealing portion 13 can prevent sewage D (shown in FIG. 1) or the like from flowing between the auxiliary pipe 6 and the bypass pipe 12.

  It is desirable that one end side of the bypass pipe 12 is slidably installed with respect to the auxiliary pipe 6 by a plurality of slide members 11b provided on the first bypass ring 12B. Note that one end side of the bypass pipe 12 may be fixed to the auxiliary pipe 6 by a plurality of fixing members similar to the fixing member 8 of the auxiliary pipe 6.

  As shown in FIG. 4, the bypass pipe 12 of the present embodiment connects the second bypass ring 12C to the other side B of the bypass pipe main body 12A. As with the cylindrical member 3A for the rehabilitation pipe 3, the second bypass ring 12C is preferably assembled in a cylindrical shape by fastening a plurality of segments. The second bypass ring 12C is preferably connected to the other end side of the bypass pipe main body 12A by a plurality of fastening members 5i.

  The second bypass ring 12 </ b> C of the bypass pipe 12 of the present embodiment has a fourth sealing portion 14 that seals between the leading conduit 9 and the bypass pipe 12. The 4th sealing part 14 is formed in the hollow annular | circular shape with the cloth which has airtightness, for example. The fourth sealing portion 14 is preferably filled with high-pressure air and seals between the leading conduit 9 and the bypass pipe 12 by the air pressure. Such a fourth sealing portion 14 can prevent sewage D (shown in FIG. 1) or the like from flowing between the front conduit 9 and the bypass pipe 12.

  It is desirable that the other end side of the bypass pipe 12 is installed so as to be slidable with respect to the tip conduit 9 by a plurality of slide members 11c provided on the second bypass ring 12C.

  Next, an embodiment of an existing pipe rehabilitation method using the existing pipe rehabilitation structure 1 will be described with reference to FIGS. 1 to 4. The rehabilitation method for the existing pipe according to the present embodiment is a method for installing the rehabilitation pipe 3 inside the existing pipe 2 in a wet state having the manhole 4 and buried in the ground. Here, the existing pipe 2 in a wet state means a state in which sewage D or the like flows inside the existing pipe 2 as shown in FIG.

  FIG. 5 is a flowchart of the existing pipe rehabilitation method of the present embodiment. As shown in FIG. 5, the existing pipe rehabilitation method of the present embodiment is first sealed between the existing pipe 2 and the existing pipe 2 on one side A in the longitudinal direction of the pipe with respect to the manhole 4. An auxiliary pipe installation step S1 for installing the auxiliary pipe 6 is performed.

  In the auxiliary pipe installation step S1, for example, the cylindrical member 6A and the auxiliary ring 6B for the auxiliary pipe 6 are loaded from the manhole 4 as a plurality of segments, and are assembled in a cylindrical shape in the space 4A at the position of the manhole 4. Thereafter, each cylindrical member 6A and auxiliary ring 6B are preferably connected to each other and fixed at a predetermined position inside the existing pipe 2.

  In the auxiliary pipe installation step S <b> 1, it is desirable that the gap between the existing pipe 2 and the auxiliary pipe 6 is sealed by the first sealing portion 7 installed in the auxiliary pipe 6. In the sealing by the first sealing portion 7, it is desirable that the air pressure of the first sealing portion 7 can be increased after the auxiliary pipe 6 is fixed at a predetermined position inside the existing pipe 2.

  Next, the method for rehabilitating the existing pipe according to the present embodiment is as follows. A pre-conduit installation step S2 for installing the sealed pre-conduit 9 is performed.

  In the leading conduit installation step S2, for example, the leading member 9A, the leading ring 9B, and the cylindrical member 9C for the leading conduit 9 are respectively carried as a plurality of segments from the manhole 4 and are cylindrically formed in the space 4A at the position of the manhole 4 Assembled. Thereafter, each of the leading members 9A, the leading ring 9B, and the cylindrical member 9C are preferably connected to each other and moved into the existing pipe 2. At this time, it is desirable that a wire W extending to another manhole located on the other side B of the manhole 4 in the longitudinal direction of the manhole 4 is connected to the leading ring 9B.

  In the leading conduit installation step S <b> 2, it is desirable that the gap between the existing pipe 2 and the leading conduit 9 is sealed by the second sealing portion 10 installed in the leading conduit 9. In the sealing by the second sealing portion 10, it is desirable that the air pressure of the second sealing portion 10 can be increased after the leading conduit 9 is moved into the existing pipe 2.

  The existing pipe rehabilitation method according to the present embodiment is a bypass pipe installation in which the manhole 4 is extended across and the sealed bypass pipe 12 is installed on the auxiliary pipe 6 on one end side and on the leading pipe 9 on the other end side. Step S3 is performed. In the bypass pipe installation step S3 of the present embodiment, the space 4A around the bypass pipe 12 of the manhole 4 is in a low wet state. Such a bypass pipe installation step S3 does not require the upstream side of the manhole 4 to be stopped for a long time, eliminates the time and labor involved in the water stop work, and is downstream when the water stop state is released. The danger on the side can also be avoided.

  In the bypass pipe installation step S3, for example, the bypass pipe main body 12A, the first bypass ring 12B, and the second bypass ring 12C are carried from the manhole 4, respectively. The bypass pipe main body 12A is desirably carried in after being assembled beforehand in a cylindrical shape on the ground. The first bypass ring 12B and the second bypass ring 12C are preferably carried in as a plurality of segments and assembled in a cylindrical shape in the space 4A at the position of the manhole 4. Thereafter, the bypass pipe main body 12A, the first bypass ring 12B, and the second bypass ring 12C are preferably connected to each other, and one end side is moved into the auxiliary pipe 6 and the other end side is moved into the front conduit 9.

  In the bypass pipe installation step S3, the space between the auxiliary pipe 6 and the leading pipe 9 and the bypass pipe 12 is set by the third sealing part 13 and the fourth sealing part 14 installed on one end side and the other end side of the bypass pipe 12, respectively. It is desirable to be sealed. The sealing by the third sealing portion 13 and the fourth sealing portion 14 is performed after the one end side of the bypass pipe 12 is moved into the auxiliary pipe 6 and the other end side is moved into the front conduit 9. It is desirable to increase the air pressure of the portion 13 and the fourth sealing portion 14.

  In the rehabilitation method for the existing pipe according to the present embodiment, a rehabilitation pipe assembling step S4 in which the cylindrical member 3A for the rehabilitation pipe 3 is assembled in the space 4A around the bypass pipe 12 of the manhole 4 and connected to the leading pipe 9 is performed next. Is called. In the rehabilitation pipe assembly step S4, since the space 4A around the bypass pipe 12 of the manhole 4 is in a low wet state, the work of assembling the cylindrical member 3A can be performed in a low wet state, so that the work efficiency is improved. Can do.

  In the rehabilitation pipe assembly step S4, for example, the cylindrical member 3A for the rehabilitation pipe 3 is carried from the manhole 4 as a plurality of segments 3a to 3d, and is assembled in a cylindrical shape in the space 4A around the bypass pipe 12 of the manhole 4. Thereafter, the cylindrical member 3A for the rehabilitation pipe 3 is connected to the cylindrical member 9C for the leading conduit 9.

  In the method of rehabilitating the existing pipe according to the present embodiment, the rehabilitation pipe is then extended together with the cylindrical member 3A for the rehabilitation pipe 3 in a state where the front pipe 9 is sealed with respect to the bypass pipe 12 and the existing pipe 2. A leading conduit moving step S5 for moving in the direction is performed.

  In the leading conduit moving step S5, the leading conduit 9 is moved in the rehabilitation tube extending direction by being pulled by the wire W from another manhole located on the other side B in the longitudinal direction of the tube with respect to the manhole 4. Is desirable. Such a leading conduit moving step S5 can smoothly move the leading conduit 9 inside the existing pipe 2.

  In the leading conduit moving step S5, the second sealing portion 10 between the existing pipe 2 and the leading conduit 9 and the fourth sealing portion 14 between the leading conduit 9 and the bypass conduit 12 reduce the internal air pressure, It is desirable to move the leading conduit 9. The second sealing portion 10 and the fourth sealing portion 14 can maintain a certain sealing property even if the internal air pressure is lowered.

  In such a leading conduit moving step S5, the leading conduit 9 is moved in a state where the air pressure of the second sealing portion 10 and the fourth sealing portion 14 is low, so that the resistance accompanying the movement of the leading conduit 9 can be reduced, The force required for towing can be reduced. Further, the friction between the second sealing portion 10 and the existing pipe 2 and between the fourth sealing portion 14 and the tip conduit 9 can be reduced, and the durability of the second sealing portion 10 and the fourth sealing portion 14 can be reduced. Can improve. In addition, after the movement of the front conduit 9, it is desirable to increase the air pressure of the second sealing portion 10 and the fourth sealing portion 14 again to prevent the inflow of the sewage D more reliably.

  In the existing pipe rehabilitation method of this embodiment, the rehabilitation pipe 3 having a predetermined length is formed by repeating the rehabilitation pipe assembling step S4 and the leading conduit moving step S5. In the second and subsequent rehabilitation pipe assembly step S4, the cylindrical member 3A for the rehabilitation pipe 3 is sequentially connected to the already connected other side B cylindrical member 3A.

  In the above-mentioned embodiment, each process of the rehabilitation method of the existing pipe is performed in the existing pipe 2 in the wet state, but each process from the auxiliary pipe installation process S1 to the bypass pipe installation process S3 is performed in the existing pipe 2. The upstream side of the sewage D may be temporarily stopped.

  Moreover, in the above-mentioned embodiment, in each process from auxiliary pipe installation process S1 to bypass pipe installation process S3, it sealed by the 1st sealing part 7 thru | or 4th sealing part 14, However, After bypass pipe installation process S3 The first sealing part 7 to the fourth sealing part 14 may be sealed with air.

  In the above-described embodiment, the bypass pipe 12 is installed via the auxiliary pipe 6, but the auxiliary ring 6 </ b> B may be directly connected to one end side of the bypass pipe 12. In this case, the connecting portion between the bypass pipe 12 and the auxiliary ring 6 </ b> B can correspond to the third sealing portion 13.

  Furthermore, in the above-described embodiment, the auxiliary pipe 6 is installed on the one side A in the longitudinal direction of the pipe with respect to the manhole 4, but another rehabilitation pipe is already formed inside the existing pipe 2 on the one side A. In this case, this other rehabilitation pipe corresponds to the auxiliary pipe 6. In this case, the backfill grout filled between another rehabilitation pipe and the existing pipe can correspond to the first sealing portion 7. Further, another rehabilitation pipe forming step may correspond to the auxiliary pipe installation step S1.

  In the above-described embodiment, each cylindrical member 3A, 6A, 9C, and the like is an aspect in which a plurality of segments are assembled in the space 4A at the position of the manhole 4. However, the diameter of each cylindrical member 3A, 6A, 9C, etc. When it is smaller than the minimum diameter of the manhole 4, it may be integrally molded or pre-assembled on the ground.

  As mentioned above, although the especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

2 Existing pipe 3 Rehabilitation pipe 3A Cylindrical member 4 Manhole 4A Space 6 Auxiliary pipe 9 End pipe 12 Bypass pipe

Claims (6)

A method for rehabilitating an existing pipe for installing a rehabilitation pipe inside a wet existing pipe buried in the ground with a manhole,
A step of installing an auxiliary pipe sealed between the existing pipe and the existing pipe on one side in the longitudinal direction of the pipe with respect to the manhole;
Installing a leading conduit that is slidable with respect to the existing pipe and sealed between the existing pipe and inside the existing pipe and on the other side in the longitudinal direction of the pipe with respect to the manhole;
By installing a sealed bypass pipe extending across the manhole and having one end side in the auxiliary pipe and the other end side in the leading conduit, the space around the bypass pipe in the manhole is in a low wet state. And a process of
Assembling a cylindrical member for rehabilitation pipes in the space and connecting to the tip conduit;
A method of rehabilitating an existing pipe, comprising the step of moving the front pipe together with the cylindrical member in a direction of extending the rehabilitation pipe in a state where the front pipe is sealed with respect to the bypass pipe and the existing pipe. Between the existing pipe and the auxiliary pipe is sealed by a first sealing portion installed in the auxiliary pipe,
Between the existing pipe and the leading conduit is sealed by a second sealing portion installed in the leading conduit,
The space between the auxiliary pipe and the leading pipe and the bypass pipe is sealed by a third sealing part and a fourth sealing part respectively installed at one end side and the other end side of the bypass pipe. Rehabilitation method for existing pipes.   3. The existing pipe according to claim 2, wherein the first sealing portion, the second sealing portion, the third sealing portion, and the fourth sealing portion are filled with air and sealed by their air pressure. Rehabilitation method.   The said front conduit | pipe is moved in the rehabilitation pipe | tube extension direction by being pulled by the wire from another manhole located in the other side of a pipe | tube longitudinal direction with respect to the said manhole. Rehabilitation method for existing pipes. A rehabilitation structure of an existing pipe including an existing pipe buried in the ground with a manhole and a rehabilitation pipe installed inside the existing pipe,
An auxiliary pipe installed inside the existing pipe and on one side in the longitudinal direction of the pipe with respect to the manhole, and a leading pipe installed inside the existing pipe and on the other side in the longitudinal direction of the pipe with respect to the manhole; An existing pipe extending across the manhole and including a bypass pipe having one end side connected to the auxiliary pipe and the other end side set to the front pipe, and the rehabilitation pipe connected to the front pipe. Rehabilitation structure. The auxiliary pipe has a first sealing portion that seals between the existing pipe and the auxiliary pipe,
The leading conduit has a second sealing portion for sealing between the existing pipe and the leading conduit,
6. The existing pipe rehabilitation structure according to claim 5, wherein the bypass pipe includes a third sealing part and a fourth sealing part for sealing between the auxiliary pipe and the leading conduit and the bypass pipe, respectively.

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