JP2015140868A - Piping method in sheath pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate an operation for connecting pipes to each other and shorten a period required for the connecting work when a carry-on plumbing method and a former push plumbing method are used together.SOLUTION: New pipes 2 are installed in a sheath pipe 1 by a carry-on plumbing method, a new pipe 12 is installed by a former push plumbing method before the new pipes 2 installed by the carry-on plumbing method, a leading pipe 12a of the new pipe 12 installed by the former push plumbing method is aligned with the new pipes 2 already installed by the carry-on plumbing method, and a last pipe 12z by the former push plumbing method is pushed to connect the leading pipe 12a with the new pipes 2 by the carry-on plumbing method. For alignment work and connecting work, a connecting device 20 including connecting rails 21 and connecting bogies 22 arranged at the bottom part of the sheath pipe is used. The extremity end of the leading pipe 12a is lifted up and connecting bogies 22 are applied and the leading pipe 12a and the connecting bogies 22 run on the rails 21 and the leading pipe is connected to the new pipes 2 by the carry-on plumbing method.

Description

  The present invention relates to a sheath pipe construction method in which a tubular body having a smaller diameter than the sheath pipe is disposed in a sheath pipe buried in the ground.

  As a method for laying liquid transportation facilities such as water and sewage (hereinafter referred to as pipes), there is a sheath pipe method in which a new pipe having a smaller diameter is piped in a sheath pipe buried in the ground.

  In the sheath pipe construction method, a carriage for carrying new pipes one by one is carried through the sheath pipe from the start shaft excavated in the ground to the destination shaft, and the new pipe is carried to the laying site. There is a construction method called. When the transporting carriage reaches a predetermined position, remove the newly installed pipe from the transporting carriage, and after completing the joint joint between the newly installed pipe and the previously installed new installed pipe, the transporting carriage Is returned to the starting shaft and the operation of feeding the next pipe body is repeated (for example, see Patent Document 1).

  In addition, in the start shaft or in the vicinity of the start shaft, new pipes to be sent out into the sheath pipe are sequentially connected to each other, and a plurality of the connected new pipes are propelled in the sheath pipe from the start shaft side to the arrival shaft side. Alternatively, there is a main push piping method towed and laid at a predetermined position (for example, see Patent Document 2).

  In addition, as a structure of a sheath pipe, what was constructed | assembled by the shield construction method, the propulsion construction method, etc. is mentioned, for example. In addition, as the new pipe, for example, a pipe body such as a ductile iron pipe is used. In addition, for joining the pipes of the new pipe in the sheath pipe, an inner joint joint in which an operator enters the new pipe and performs work is often used.

JP-A-6-247208 JP 58-46289 A

  In the above-mentioned carry-in piping method, where new pipes are sent one by one to the laying site, if the distance from the starting shaft to the reaching shaft becomes longer, the total travel distance of the carriage for carrying the pipe will be longer and the overall work process will be longer. There is a problem of becoming. In addition, this construction method has a problem that the time required for the construction becomes long even in the point that the joint joining work in a narrow pipe or pipe increases. In this respect, the main pushing piping method is advantageous in that the time required for the construction can be shortened.

  By the way, when the curve section is interposed in the middle of the sheath pipe, there is a situation that it is difficult to adopt the main push piping method. In such a case, it is also possible to carry in piping in a curve section in advance and perform main pushing piping from both sides across the curve section (see Patent Document 2 above).

  However, it is difficult to connect the pipe body at the tip of the main push pipe over a long distance to the pipe body previously laid by the carry-in pipe in terms of the centering of both pipe bodies and the docking technique. For example, as shown in the change from the state at the start of insertion in FIG. 6 (a) to the state after propulsion in FIG. 6 (b), the newly installed pipe 2 rolls in the sheath pipe 1 and the core is displaced. Because it is easy to become. For example, as shown in the change from the state at the start of insertion in FIG. 6 (c) to the state after propulsion in FIG. 6 (d), the deviation of the tube core becomes more prominent as the diameter of the sheath 1 increases. Tend to be.

  For this reason, in patent document 2, it is the actual situation that the pipe body laid first in the curve section is a steel pipe, and the main push pipe body is joined by welding.

  Then, this invention makes it a subject to make it easy to connect pipe bodies and to shorten the period required for construction, when the carrying-in piping method and the main pushing piping method are used together in the sheath piping method.

  In order to solve the above-described problems, the present invention lays a plurality of new pipes in a connected state, and a carry-in piping method for transporting new pipes one by one to a laying site when laying new pipes in a sheath pipe. In the sheath pipe construction method, which is used in combination with the main pipe construction method to be transported to the location, a new pipe is laid in the sheath pipe by the brought-in pipe construction method, and then a new newly constructed pipe is placed before the new pipe laid by the carry-in piping construction method. Is then laid by the main pipe construction method, and then the leading pipe of the new pipe laid by the main pipe construction method is aligned with the new pipe that has already been installed, and finally the main pipe construction method The last pipe is pressed to dock the top pipe and the new pipe by the brought-in piping method, and the centering and docking are performed by the new pipe and the brought-in pipe method. A joining device provided between the pipe, the joining device comprising a docking rail disposed on the bottom of the sheath tube and a docking carriage that runs on the docking rail; The docking carriage is directed to the top, the last pipe is pressed, and the leading pipe is docked with a new pipe by a brought-in piping method while traveling on the rail together with the docking carriage. The rust sheath pipe construction method was adopted.

  According to this construction method, since a joining device having a docking rail and a docking cart is used for centering and docking of the leading pipe of the newly installed pipe by the main push piping method and the new pipe by the carry-in piping method, both Can be easily aligned, and both pipes can be aligned smoothly when docked. For this reason, it becomes easy to use a carrying-in piping method and a main pushing piping method together, and as a result, the period which construction requires can be shortened.

  In this configuration, the docking carriage may include an arc-shaped member that is in surface contact with the cylindrical bottom surface of the leading pipe.

  If the docking carriage is provided with an arc-shaped member that comes into surface contact with the cylindrical bottom surface of the leading pipe, the leading pipe is more securely held by the docking carriage during centering and docking. For this reason, the precision of centering improves. Further, also in various joining operations at the time of docking, errors in relative positions in the tube diameter direction and tube axis direction between the tube bodies are reduced, and as a result, the connection between the tube bodies can be facilitated.

  The following can be adopted as a joining device used in the sheath pipe construction method having these components. The configuration includes a docking rail arranged at the bottom of the sheath pipe and a docking carriage that runs on the docking rail, and the centering of the leading pipe by the main push pipe method and the new pipe by the carry-in pipe method When docking, the leading end of the leading pipe is raised to address the docking carriage, and the leading pipe is pressed and the leading pipe moves along the rail with the docking carriage to bring in the piping method. It is a new pipe joining device characterized by docking with a new pipe.

  Since this invention uses a joining device having a docking rail and a docking cart for centering and docking of the new pipe by the main pipe construction method and the new pipe by the carry-in pipe construction method, both cores are used. Alignment is easy, and both tubes can be aligned smoothly when docked. For this reason, it becomes easy to use a carrying-in piping method and a main pushing piping method together, and as a result, the period which construction requires can be shortened.

(A)-(f) is sectional drawing which shows one Embodiment of this invention (A)-(c) is sectional drawing which shows the detail at the time of docking with the new installation pipe by the carrying-in piping method, and the new installation pipe by the main pushing piping method (A)-(c) is sectional drawing which shows the detail at the time of docking with the new installation pipe by the carrying-in piping method, and the new installation pipe by the main pushing piping method (A) is a detailed view showing the laying state of the new pipe by the main push piping method, (b) is a detailed view showing the laying state of the new pipe by the carry-in piping method (A) (b) is a detailed view showing a joining device Explanatory drawing showing an example of misalignment between the sheath pipe and the new pipe

  An embodiment of the present invention will be described with reference to the drawings. This embodiment is a sheath pipe construction method in which new pipes 2 and 12 having a smaller diameter are piped in the sheath pipe 1 buried in the ground as a construction method for pipes such as water and sewage. The new pipes 2 and 12 are laid in the sheath pipe 1 connecting the starting shaft 7 to the reaching shaft 8 by using both the brought-in piping method and the main pushing piping method.

  In this embodiment, the structure of the sheath tube 1 is a tube constructed by a shield method, a propulsion method, or the like. In addition, as the new pipes 2 and 12, ductile iron pipes are used.

  The carry-in piping method is a method of moving the new pipe 2 one by one in the sheath pipe 1 along the pipe axis direction and transporting the new pipe 2 to the laying site in the sheath pipe 1. The new pipe 2 is placed on a transportation carriage or the like, and moves to the laying position while traveling in the sheath pipe 1. When the new pipe 2 reaches a predetermined position, the new pipe 2 is removed from the carriage using a jack or the like, and the newly installed pipe 2 and the joint of the previous new pipe 2 already installed are removed. After the joining is completed, the transportation cart is returned to the start shaft and the next new pipe 2 is sent in repeatedly.

  For joining the new pipes 2, a general inner joint joint in which an operator enters the new pipe 2 and performs work can be used. Usually, it arrange | positions so that the insertion port 3 of the new pipe 2 may face the arrival shaft 8 side, and the receiving port 4 may face the start shaft 7 side. Further, the new pipe 2 is laid while being held on the bottom of the sheath pipe 1 by using the cradle 5 (see FIG. 4B).

  In the main push piping method, new pipes 12 taken down to the start shaft 7 are sequentially inserted into the sheath pipe 1, and the new pipe already inserted into the sheath pipe 1 in the start shaft 7 or in the vicinity of the start shaft 7. 12 and the newly installed pipes 12 to be sent out are sequentially joined together. The joining method of the newly installed pipes 12 is the same as that of the newly installed pipe 2 by the above-mentioned brought-in piping method.

  The plurality of connected new pipes 12 are propelled in the sheath pipe 1 from the start shaft 7 side toward the arrival shaft 8 side, and the new pipe 12 is laid at a predetermined position. At this time, the traveling device 6 is used as a device for moving the new pipe 12 within the sheath pipe 1. In addition, like the new pipe 2, the new pipe 12 is usually arranged so that the insertion port 13 faces the arrival shaft 8 and the receiving port 14 faces the start shaft 7.

  In this embodiment, the traveling device 6 for the new pipe 12 includes a plurality of arc-shaped members 6a fixed to the outer periphery of the new pipe 12 and wheels 6c provided at the end of the arc-shaped member 6a. Adopted. The arc-shaped member 6a includes rising portions 6b that rise in the outer diameter direction at both ends in the arc direction. A wheel 6c is rotatably held between a rising portion 6b of the arc-shaped member 6a and a rising portion 6b of another arc-shaped member 6a adjacent in the pipe circumferential direction (see FIG. 4A). Further, the arc-shaped members 6a adjacent to each other in the pipe circumferential direction are connected to each other by bolts or the like to form an annular shape, and are fixed so as not to move on the outer circumference of the new pipe 12. The wheels 6c are arranged at regular intervals along the pipe circumferential direction.

  A plurality of the traveling devices 6 are installed at a certain interval along the tube axis direction of the plurality of new tubes 12 in a connected state. By pressing the new pipe 12 positioned closest to the start shaft 7 toward the arrival shaft 8, the plurality of new tubes 12 in a connected state are sheath tubes 1 from the start shaft 7 toward the arrival shaft 8. Moves along the tube axis.

  Hereinafter, the procedure of the sheath pipe construction method will be described.

  Here, when laying the new pipes 2 and 12 in the sheath pipe 1, the carry-in piping method for transporting the new pipes 2 to the laying place one by one is performed first, and then a plurality of the new pipes 12 in a connected state are connected. The main push piping method is used to transport the to the laying site.

  As shown in FIGS. 1A to 1C, new pipes 2 are sequentially laid in the sheath pipe 1 by a brought-in piping method. Here, three new pipes 2 are laid by the carry-in piping method, but the number is the distance from the starting shaft 7 to the reaching shaft 8, the number of new pipes 2 that can be laid by the carry-in pipe method, distance, etc. It can be set freely according to.

  Next, as shown in FIGS. 1 (d) and 1 (e), a new new pipe 12 is laid by the main push piping method up to the front of the new pipe 2 laid by the carry-in piping method. The method of laying the new pipe 12 by the main push piping method is as described above.

  After that, as shown in FIG. 1 (f), the insertion opening 13 of the leading pipe 12a of the new pipe 12 laid by the main pushing pipe construction method is used as the receiving port for the new pipe 2 at the rear end by the already installed carrying pipe construction method. Dock to 4. The following joining apparatus 20 is used for the centering and joining operations of the tube bodies during the docking.

  As shown in FIG. 5, the joining device 20 includes a docking rail 21 disposed on the bottom of the sheath tube 1 and a docking carriage 22 that travels on the docking rail 21.

  As shown in FIG. 2 (b), a docking rail 21 and a docking carriage 22 are placed between the leading pipe 12a of the new pipe 12 by the main push pipe construction method and the rear end of the new pipe 2 by the carry-in pipe construction method. Deploy. Then, as shown in FIG. 2C, the leading end of the leading pipe 12a is raised, and the docking carriage 22 is applied to the lower surface of the leading pipe 12a as shown in FIG.

  When raising the tip of the leading pipe 12a, a pipe lifting means such as a hydraulic jack is stretched between the inner surface of the sheath pipe 1 and the outer surface of the leading pipe 12a, and the tip of the leading pipe 12a is pulled by the pipe lifting means. When the lift is raised, the docking carriage 22 may be fed from the front to the rear toward the bottom of the top pipe 12a.

  At this time, it is convenient that the pipe lifting means such as a hydraulic jack is disposed at a position where the insertion of the docking carriage 22 is not hindered, that is, on the outer side in the pipe circumferential direction (outside the gauge) with respect to the pair of docking rails 21. After inserting the docking carriage 22, the height of the new pipe 12 is gradually lowered by the function of the pipe lifting means, and the new pipe 12 is taken down onto the docking carriage 22.

  Here, as shown in FIG. 5A, the docking carriage 22 includes an arcuate member as a tubular body holding portion 22a that comes into surface contact with the cylindrical outer surface (bottom surface) of the top tube 12a. A pair of axle holding portions 22b projecting downward is fixed to the tube holding portion 22a, and the axle holding portion 22b rotatably holds an axle 22d connecting the left and right wheels 22c and 22c. doing. In the state shown in FIG. 5A, the docking rail 21 and the docking carriage 22 are symmetrical with respect to a vertical line passing through the tube axis of the sheath tube 1.

  Therefore, if the docking carriage 22 is placed on the docking rail 21 so as to be able to travel and the new pipe 12 is placed on the tube body holding portion 22a, the axis of the new pipe 12 is the axis of the sheath pipe 1. It is positioned on the vertical line that passes through and is centered. In other words, the docking rail 21 may be disposed at a position where the centering is performed by placing the new pipe 12 on the docking carriage 22.

  Further, by setting the heights of the docking rail 21 and the docking carriage 22 in advance in accordance with the diameters of the new pipe 12 and the sheath pipe 1, the axis of the new pipe 12 and the axis of the sheath pipe 1 are set. It is also possible to perfectly match the mind.

  Since the docking carriage 22 includes an arc-shaped member that is in surface contact with the cylindrical bottom surface of the leading pipe 12a as the tube holding portion 22a, the leading pipe 12a is docked to the docking carriage 22 during centering and docking. Is more firmly held. For this reason, the precision of centering improves. Further, in various joining operations at the time of subsequent docking, errors in relative positions in the tube diameter direction and the tube axis direction between the tube bodies are reduced, and as a result, connection between the tube bodies can be facilitated. .

  Finally, as shown in FIG. 3B, a plurality of new pipes connected by pressing the last pipe 12z of the new pipe 12 while the docking carriage 22 is addressed to the lower surface of the head pipe 12a. 12 is advanced to the reaching shaft 8 side. The insertion tube 13 enters the receiving port 4 while the leading tube 12a travels on the docking rail 21 together with the docking carriage 22, and the new tube 12 is docked to the new tube 2 by the carry-in piping method.

  After laying the new pipes 2 and 12, a grout such as cement mortar is injected between the inner surface of the sheath pipe 1 and the outer surface of the new pipes 2 and 12, and the sheath pipe between the start shaft 7 and the reaching shaft 8. End piping into 1.

  In this way, the joining device 20 including the docking rail 21 and the docking carriage 22 is provided for centering and docking of the leading pipe 12a of the new pipe 12 by the main push pipe construction method and the new pipe 2 by the carry-in pipe construction method. Since it is used, both cores can be easily aligned, and both tubes can be smoothly aligned when docked. For this reason, it becomes easy to use a carrying-in piping method and a main pushing piping method together, and as a result, the period which construction requires can be shortened. In other words, in the conventional pipe construction method, the new pipe 2 that has already been laid by the carry-in pipe construction method and the main push-pipe construction method are used instead of the rails and carts that have been adopted to transport the new pipe 2 in the sheath pipe 1. A feature of the present invention resides in that the joining device 20 including the docking rail 21 and the docking carriage 22 is employed at the connection location with the new pipe 12 (the leading pipe 12a).

  In this embodiment, an arc-shaped member is adopted as the tube body holding portion 22a, and the shape thereof is along the cylindrical surface of the outer surface of the new tube 12, as shown in FIG. However, the cylindrical surface along the pipe circumferential direction may be continuous from one end to the other end of the arc as in this embodiment, or intermittent along the pipe circumferential direction. It may be. Further, the tube body holding portion 22a is not limited to a member having a cylindrical surface along the tube circumferential direction, and the new tube 12 is placed on the docking carriage 22 placed on the docking rail 21. Therefore, it is sufficient that the core is aligned with the sheath tube 1 of the new tube 12.

  In this embodiment, the docking rail 21 and the docking carriage 22 mounted thereon are set to be symmetrical with respect to a vertical line passing through the axis of the sheath tube 1. The docking rail 21 and the docking carriage 22 are not limited to a line-symmetric arrangement as long as the centering is achieved by placing the new pipe 12 on the docking carriage 22 placed on the carriage 21.

1 sheath pipe 2 newly installed pipe (newly installed pipe by carrying-in piping method)
3, 13 Insertion openings 4, 14 Receiving openings 5 Receiving bases 6 Traveling devices 6a Arc-shaped members 6b Rising parts 6c Wheels 7 Starting shafts 8 Reaching shafts 12 Newly installed pipes (newly installed pipes by the main push piping method)
12a Lead pipe 12z End pipe 20 Joining device 21 Docking rail 22 Docking carriage 22a Tube holding part 22b Axle holding part 22c Wheel 22d Axle

Claims (3)

When laying new pipes (2, 12) in the sheath pipe (1), the new pipes (2) are transported one by one to the installation site, and a plurality of new pipes (12) connected together. In the sheath pipe construction method, which is used in combination with the main pipe construction method that transports the
The new pipe (2) is laid in the sheath pipe (1) by the brought-in piping method, and then the new new pipe (12) is pushed to the front of the new pipe (2) laid by the brought-in pipe method. After that, after aligning the leading pipe (12a) of the newly installed pipe (12) laid by the former push piping method with the newly installed pipe (2) by the brought-in piping method, and finally, Press the last pipe (12z) by the former push pipe construction method and dock the front pipe (12a) and the new pipe (2) by the carry-in pipe construction method,
The centering and docking use a joining device (20) provided between the leading pipe (12a) and a new pipe (2) by the carry-in piping method, and the joining device (20) is a sheath pipe (1 ) And a docking carriage (22) that travels on the docking rail (21), and the leading end of the top pipe (12a) is lifted to make the docking The carriage (22) is addressed, the last pipe (12z) is pressed, and the leading pipe (12a) is moved along the rail (21) together with the docking carriage (22), and a newly installed pipe ( The sheath pipe construction method characterized by being docked in 2).   The sheath piping method according to claim 1, wherein the docking carriage (22) includes an arcuate member (22a) in surface contact with a cylindrical bottom surface of the leading pipe (12a).   It is a joining apparatus (20) used for the sheath pipe construction method of Claim 1 or 2, Comprising: The rail for docking (21) arrange | positioned at the bottom of a sheath pipe (1), The rail for docking (21) A docking carriage (22) that travels above, and when centering and docking the leading pipe (12a) by the main push piping method and the new pipe (2) by the carry-in piping method, the leading pipe (12a ), The docking carriage (22) is raised, the last pipe (12z) is pressed, and the leading pipe (12a) travels on the rail (21) together with the docking carriage (22). A new pipe joining device, which is docked to the new pipe (2) by the carry-in piping method.

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