JP2016196911A - Sheath pipe jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a preceding new pipe and a subsequent new pipe from separating each other, in a sheath pipe jacking method using a caster device.SOLUTION: A sheath pipe thrust method disposes a pipe conduit by feeding a pipe P, which is a joint structure in which a spigot 1 is inserted to a socket 2 to be joined, into a sheath pipe P' while subsequently joining the above pipe P to a precede pipe P. In the sheath pipe thrust method, support means 10 provided outside the sheath pipe P' and the pipe P fed into the sheath pipe P' are coupled by a coupling member 11, the support means 10 holds the pipe P through the coupling member 11, and thereby the joined pipes P are maintained in a joined state. The insertion length of the coupling member 11 into the sheath pipe P' is adjusted by the support means 10, according to movement of the pipe P, to which the coupling member 11 is connected, in the sheath pipe P'.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sheath tube propulsion method in which a pipe for transporting fluid used for water supply, gas, sewerage, etc. is disposed in an existing sheath.

  As a method for embedding various fluid transport pipes such as ductile cast iron pipes in the ground, an open-cut method for excavating the ground and disposing a pipe body is generally used. However, if it is difficult to cut off traffic due to excavation, a fume pipe or steel pipe or the like is buried by propulsion as a sheath pipe (sheath pipe) that connects the excavated start pit and the arrival mine. In some cases, a method of inserting a new pipe such as a ductile cast iron pipe may be employed. In some cases, an existing pipe already in service is used as a sheath pipe, and a new pipe having a small diameter is inserted therein to renew the pipe. These methods of embedding a relatively small-diameter new pipe in an existing sheath are called sheath tube propulsion methods.

  In the sheath pipe propulsion method, a new pipe having a smaller diameter than the sheath pipe is sequentially inserted from the launch tunnel side into the sheath pipe buried between the start shaft and the arrival shaft. . A hydraulic jack is installed in the starting pit, and the hydraulic jack takes a reaction force on the inner wall of the starting pit and presses the new pipe toward the destination mine side with the front rod. The new tube is sequentially joined by inserting the insertion port at the tip of the new tube into the receiving port at the rear end of the preceding new tube, and is pushed into the sheath.

  A caster device is attached to the outer periphery of the new pipe. The caster device is provided with wheels, and a new pipe can run in the sheath by rolling of the wheels. For this reason, a new pipe is smoothly propelled by press by a hydraulic jack.

JP 2003-74745 A

  In the sheath propulsion method, the slope is often ascending or flat (horizontal) from the starting pit to the reaching pit, but depending on the location conditions, there is a downward slope section from the starting pit toward the reaching pit. There is also.

  If the slope is descending from the starting pit to the arrival pit, the preceding new pipe may slide down from the succeeding new pipe, or the new pipe may slide along the sheath with the following new pipe. is assumed. In addition, even if it does not slide down, it is assumed that there is less overlap allowance in the pipe axis direction (depth of insertion into the receiving port) at the joint of the preceding new tube and the succeeding new tube. Is done.

  In this regard, in Patent Document 1 described above, in order to prevent such a situation, by replacing some of the wheels of the caster device with a sled, the propulsion resistance on the downward slope is increased to prevent sliding, etc. On the other hand, the presence of such a warp has a problem that the propulsion by the hydraulic jack at the uphill portion becomes excessively heavy.

  Therefore, in the sheath tube propulsion method, the present invention does not excessively increase the propulsion resistance of the tube sent into the sheath tube, the preceding tube and the succeeding tube slide down, or the overlapping margin between the tubes in the joint portion is increased. It is an object to prevent the decrease.

  In order to solve the above-described problems, the present invention arranges a pipe which is a joint structure in which an insertion port is inserted into a receiving port and joined together, and the pipe is arranged while sequentially joining the preceding tube. In the sheath tube propulsion method, the supporting means provided outside the sheath pipe and the pipe fed into the sheath pipe are connected by a connecting material, and the supporting means holds the tube via the connecting material. The sheath propulsion method was adopted to maintain the joined state of the joined pipes.

  The length of penetration of the connecting material into the sheath tube can be adjusted by the support means as the tube connected to the connecting material moves through the sheath tube.

  Further, in order to solve the above-mentioned problems, the present invention arranges a pipe line by feeding a pipe, which is a joint structure to be inserted and inserted into a receptacle, into a sheath pipe while sequentially joining the preceding pipe. As a slip-preventing device for a pipe joint used in a sheath pipe propulsion method, a support means provided outside the sheath pipe and a connecting material that connects the pipe fed into the sheath pipe, the support The means employ | adopted the structure which maintains the joining state of the said pipes joined by hold | maintaining the said pipe | tube via the said connection material.

  In this invention, the supporting means provided outside the sheath and the pipe fed into the sheath are connected by a connecting material, and the supporting means holds the tube via the connecting material, thereby connecting the pipes in the sheath. Since the alignment state is maintained, it is possible to prevent the leading and succeeding pipes from slipping down or reducing the overlap margin between the pipe bodies at the joint without excessively increasing the pushing resistance of the pipes. .

A longitudinal sectional view showing an embodiment of the present invention Main part enlarged perspective view of the same embodiment The principal part expanded sectional view of the embodiment

  An embodiment of the present invention will be described with reference to the drawings. In this embodiment, a pipe P such as a ductile cast iron pipe is installed in a sheath pipe P ′ buried in the ground such as a steel pipe or a concrete pipe by a propulsion method. The pipe P, which is a joint structure in which the insertion port 1 is inserted into the receiving port 2 and joined together, is fed into the sheath tube P ′ while sequentially joining the preceding pipe P, and the pipeline is arranged. Hereinafter, the pipe P disposed in the sheath pipe P ′ is referred to as a new pipe P.

  As shown in FIG. 1, the new pipe P is lowered into the start shaft S while being suspended by a crane or the like. First, the first new pipe P is inserted into the sheath pipe P 'with the insertion port 1 at the front end thereof directed toward the arrival mine (the arrival mine is not shown in FIG. 1). The next new tube P is inserted and spliced into the receiving port 2 at the rear end of the preceding new tube P. Further, the next new pipe P is fed into the sheath pipe P ', and the insertion port 1 is inserted into the receiving port 2 of the rearmost new pipe P and joined.

  A hydraulic jack J is installed in the start pit S, and the hydraulic jack J takes a reaction force against the inner wall H of the start pit S and presses the new pipe P toward the destination mine side with the front rod. By this pressing, the plurality of new pipes P group connected by the joint portion are pushed into the sheath pipe P ′.

  A caster device 3 is attached to the outer periphery of the new pipe P. In the caster device 3, a rotatable wheel is provided on a frame surrounding the outer periphery of the new pipe P, and the new pipe P can travel in the sheath pipe P 'by rolling the wheel. For this reason, the new pipe P is smoothly pushed by the pressure by the hydraulic jack J.

  As the caster device 3, for example, a frame composed of a plurality of arc-shaped members is provided, and the flange portions provided at the arc-direction ends of the arc-shaped frame are tightened by bolts / nuts or the like as a whole. The thing fixed so that it may form circular and may not move to the outer periphery of the new pipe P is mentioned. The wheel axle can be fixed by connecting opposite flange portions.

  In addition, the form of the joint part between new pipes P is suitably selected according to the use and specification of a pipe line. For example, a protrusion is provided at the tip of the insertion port 1 and a lock ring is provided on the inner surface of the receiving port 2. After inserting the insertion port 1 into the receiving port 2 with a rubber ring or the like interposed therebetween, a rubber ring is formed by a push ring. It is possible to employ a structure in which the seal is pushed into the gap between the insertion port 1 and the receiving port 2.

  In this type of sheath tube propulsion method, in the present invention, in order to maintain the seamed state of the new tubes P in the sheath tube P ′ during the propulsion of the new tube P, a slip prevention device for the pipe joint portion is provided. The propulsion method used is used.

  As shown in FIG. 1, the structure of the slip-off preventing device includes a connecting member 11 that connects the support means 10 provided outside the sheath tube P ′ and the new tube P fed into the sheath tube P ′, and the connecting member 11. And a locking means 20 or the like for connecting to the new pipe P.

  In this embodiment, a metal wire is used as the connecting member 11, but any other material can be used as long as it holds the new pipe P and has strength to prevent the new pipe P from sliding or sliding. There may be. For example, it may be a fiber string or rope, or may be a longitudinal member made of metal, fiber, or other material. However, it is desirable that the connecting material 11 be a flexible material that can be bent in order to cope with a curve in the sheath pipe P 'or to handle in the start pit S.

  The supporting means 10 includes a plurality of pulleys 12 and 13 provided inside and outside the start pit S, a winding device 14 disposed on the ground G on the ground, and a driving source for rotating the winding device 14 according to a driving force. Equipped with a winch made of etc. The drive source is composed of a motor, an engine, and the like, and controls the output thereof to rotate the winding device 14 in the necessary direction as much as necessary to wind up the connecting material 11 or the winding connection. The material 11 can be sent out.

  The connecting material 11 connected to the new pipe P changes its direction through a plurality of pulleys 12 and 13 provided inside and outside the start pit S, and is wound around the rotor of the ground winding device 14.

  In this embodiment, since the connecting material 11 is connected to the leading new pipe P, the length of the connecting material 11 is a length that can hold the new pipe P until the leading new pipe P reaches the arrival shaft, That is, it is more than the length from the winding device 14 through the starting pit S to the reaching mine. If the new pipe P reaches the reaching pit, the connecting material 11 may be separated from the new pipe P.

  The detail of the connection part to the new pipe P of the connection material 11 is shown in FIG.2 and FIG.3.

  The end 11 a of the connecting member 11 is connected to the end edge of the insertion opening 1 of the leading new tube P by the locking means 20. The locking means 20 includes a fixing member 22 that is fixed to the edge of the insertion slot 1 and a connecting member 21 that is swingably connected to the fixing member 22. The ring-shaped end portion 11 a of the connecting member 11 is connected to the hole portion of the connecting member 21.

  The fixing member 22 has an end sandwiching member 22b having a U-shaped cross section sandwiching the inner and outer surfaces of the insertion slot 1, and a holding member that is fixed to the outside of the end sandwiching member 22b by welding or the like and also has an U-shaped section. 22a. The end clamping member 22b is fastened and fixed to the end edge portion of the insertion slot 1 by a fastening member 22c made of a bolt. If the bolt of the fastening member 22c is screwed in, the end clamping member 22b is pressed against the inner surface of the insertion slot 1 and fixed to the new pipe P.

  The connecting member 21 includes a bifurcated base portion 21b on the distal end side that is connected to the holding member 22a via a swing shaft 21c, and a flat connecting piece 21a that extends rearward from the base portion 21b (receiving port 2 side). With. The base 21b and the connecting piece 21a are swingable about the swing shaft 21c with respect to the holding member 22a. For this reason, the wire (connecting material 11) connected to the connecting member 21 can swing with respect to the fixing member 22, as shown in FIG.

  The swing shaft 21c is inserted through a hole in the forked base 21b and a hole provided in the holding member 22a. As for the holes of the bifurcated base portion 21b, one hole is unthreaded and the other hole is internally threaded. The swing shaft 21c having a male screw formed at the tip is inserted through one hole of the base 21b, the hole of the holding member 22a, and the other hole of the base 21b in this order, and the male screw at the tip of the swing shaft 21c is inserted into the other The connecting member 21 is detachably connected to the fixing member 22 by being screwed into the female screw of the hole.

  In the sheath tube propulsion method, a group of new tubes P joined together is propelled by the hydraulic jack J and advances in the sheath tube P ', and the leading new tube P reaches the downward slope section of the sheath tube P'. Suppose. Alternatively, as shown in FIG. 1, a case is assumed in which the sheath pipe P ′ is attached to the starting pit S with a downward slope.

  At this time, the new pipe P has a downward slope in accordance with the slope of the sheath pipe P '. That is, the pipe axis direction of the new pipe P is in a state of making a depression with respect to the horizontal direction from the start pit S to the arrival pit.

  The support means 10 can maintain the joined state of the joined new pipes P by holding the leading new pipe P and the succeeding rear new pipe P group via the connecting member 11. That is, the propulsion of all the new pipes P is continued while maintaining the state of the normal joint part without the joint part of the adjacent new pipe P sliding down.

  The holding of the new pipe P through the connecting material 11 is maintained by adjusting the length of the connecting material 11 entering the sheath P 'as the new pipe P advances. That is, the length of penetration of the connecting material 11 into the sheath pipe P ′ is controlled by controlling the output of the winch as the new pipe P to which the connecting material 11 is connected moves within the sheath pipe P ′. Adjustment is made by rotating the rotor of the winding device 14 as necessary. At this time, the tension of the connecting member 11 is set so that the connecting member 11 does not loosen and when the hydraulic jack J is used, the pressing resistance of the new pipe P by the hydraulic jack J is not excessively increased. It is desirable.

  Thus, even in the case of propulsion in the down-sheathed sheath pipe P ′, it is possible to prevent a situation in which the preceding new pipe P is detached from the succeeding new pipe P and slides in the sheath pipe P ′. Moreover, the situation where the penetration depth of the insertion port 1 to the receiving port 2 in the joint part of the preceding new pipe P and the succeeding new pipe P decreases is also prevented.

  In addition, if it is a downward slope, the new pipe P will be sent in by lowering the sheath P by its own weight without pressing the new pipe P by the hydraulic jack J. Can do. At this time, since the new pipe P is held by the support means 10 outside the sheath pipe P ′ via the connecting material 11, the new pipe P is advanced as much as necessary while sequentially sending the connecting material 11, and the starting pit S On the side, new pipes P can be spliced together.

  The form of the sheath pipe P ′ to which the present invention can be applied is not limited to the above-described embodiment. For example, the downhill section, the horizontal section, and the uphill section are formed from the starting pit S to the way to the arrival pit. The present invention can also be applied to a configuration that reaches the reaching pit, or a configuration in which a part from the starting pit S to the middle is a downward gradient section, and thereafter is a horizontal section to the reaching pit.

  At this time, in particular, when the length of the ascending slope section or the horizontal section is longer than the length of the descending slope section, there is a gradual concern that the joint part may slide down or the new pipe P may slide as the new pipe P progresses. When it decreases, it can be set as the structure which uses this slipping prevention apparatus only in the downward slope area of the sheath P '. Further, if there is a downward slope section near the starting pit S of the sheath pipe P ′, the hydraulic jack J is not pressed at least while the leading new pipe P is in the downward slope section, and the leading new pipe P is inclined upward. It can be set as the structure which presses with the hydraulic jack J only after entering a section or a horizontal section.

  When the slip prevention device is used only in the downward slope section, it is sufficient that the length of the connecting member 11 is equal to or longer than the length from the winding device 14 through the start shaft S to the end point of the downward slope section. When the new pipe P passes through the end point of the downward slope section, the connecting material 11 can be separated if there is no downward slope to the reaching mine and there is no fear of sliding or sliding. Separation may be performed on the new pipe P side, may be performed on the winding device 14 side, or the connecting material 11 may be cut at any intermediate portion.

  In the above-described embodiment, the connecting material 11 is connected to the leading new pipe P. However, when the new pipe that is likely to slide down or slide is a new pipe P other than the leading pipe, an intermediate other than the leading pipe is used. The connecting material 11 may be connected to the new pipe P of the part.

DESCRIPTION OF SYMBOLS 1 Insert port 2 Receiving port 3 Caster apparatus 10 Support means 11 Connection material (wire)
11a End portion 20 Locking means 21 Connection member 21a Connection piece 21b Base portion 21c Oscillating shaft 22 Fixing member 22a Holding member 22b End portion clamping member 22c Tightening member J Hydraulic jack P New pipe P 'Sheath pipe S Starting shaft

Claims (3)

Pipe (P), which is a joint structure in which the insertion opening (1) is inserted into the receiving opening (2) and joined together, is sequentially joined to the preceding pipe (P) and then fed into the sheath pipe (P ′). In the sheath pipe construction method,
The support means (10) provided outside the sheath pipe (P ′) and the pipe (P) fed into the sheath pipe (P ′) are connected by a connecting material (11), and the support means (10 ) Is a sheath tube propulsion method that maintains the joined state of the joined pipes (P) by holding the pipe (P) via the connecting material (11).   The length of penetration of the connecting material (11) into the sheath tube (P ′) is that the tube (P) to which the connecting material (11) is connected moves in the sheath tube (P ′). The sheath pipe propulsion method according to claim 1, wherein the support means (10) adjusts according to the conditions. Pipe (P), which is a joint structure in which the insertion opening (1) is inserted into the receiving opening (2) and joined together, is sequentially joined to the preceding pipe (P) and then fed into the sheath pipe (P ′). Is used in the sheath pipe construction method,
A support means (10) provided outside the sheath pipe (P ') and a connecting member (11) for connecting the pipe (P) fed into the sheath pipe (P'); (10) is an apparatus for preventing slipping of the pipe joint portion that maintains the joined state of the joined pipes (P) by holding the pipe (P) via the connecting material (11).

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