JP2014152854A - Pipeline laying method and jig for rotation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipeline laying method capable of preventing a bent pipe and a sheath pipe from damaging in a case of carrying the bent pipe by a truck, and capable of downsizing the aperture of the sheath pipe.SOLUTION: In a pipeline laying method that lays a body pipeline in a sheath pipe 1 by carrying a plurality of carrying-in pipes 11 in the sheath pipe 1 and connecting the carrying-in pipes 11 with each other, when the carrying-in pipe 11 is a bent pipe 11b, the bent pipe 11b is loaded on a truck 18 in a carrying attitude of placing an outer peripheral side 16 of a bent part downward, and is carried. The bent pipe 11b is connected to a laid carrying-in pipe already laid in the sheath pipe while being rotated in a predetermined direction from the carrying attitude.

Description

  The present invention relates to a pipe laying method for laying a main pipe in a sheath pipe, and a rotation jig used for rotating a bent pipe in the pipe laying method.

  Conventionally, as this type of pipe laying method, while excavating a tunnel in the ground using a small shield machine, a plurality of segments are connected in the tunnel, and a sheath pipe is laid. There is known a non-cutting method in which a carry-in pipe is carried and transported by a carriage, these carry-in pipes are connected to each other, and a main pipe line such as a water pipe is laid in a sheath pipe.

  As shown in FIGS. 33 and 34, when the straight path portion 102 and the curved path portion 103 exist in the sheath pipe 101, the straight pipe 104a may be used as the carry-in pipe 104 in the straight path portion 102. In the curved path portion 103, it is necessary to use the bent tube 104b as the carry-in tube 104. In this case, the bent pipe 104 b is placed on the carriage 105, transported through the sheath pipe 101, and connected to the already brought-in carry pipe 104 that has already been laid in the sheath pipe 101.

  Further, when connecting the bent pipe 104b to the laying-in carry-in pipe 104 in the sheath pipe 101 as described above, as shown in FIG. 34, the bent pipe 104b is rotated around the axis of the pipe in a predetermined direction. In such a state, the bent pipe 104b may be connected to the laid-in carry-in pipe 104.

  At this time, hooks 107a, 108a of two winders 107, 108 (for example, lever block (registered trademark), etc.) are hooked into bolt holes (not shown) formed in the main beam 110 of the segment 109, Both winders 107 and 108 are suspended from the ceiling of the sheath tube 101 between the sheath tube 101 and the bent tube 104b. Then, the wire 112 is wound around the bent pipe 104b from below and connected between the other hooks 107c and 108c at the ends of the chains 107b and 108b of the winders 107 and 108.

  Then, by operating both winders 107, 108, the chain 107b of one winder 107 is wound little by little and the chain 108b of the other winder 108 is fed little by little. It can be rotated little by little in one direction D.

  The non-cutting method as described above is described in, for example, Patent Document 1 below.

Japanese Patent No. 3725962

  However, in the above conventional type, as shown in FIG. 33, when the bent pipe 104b is transported by the carriage 105, both ends of the bent pipe 104b are directed in the front-rear direction (traveling direction) of the carriage 105, and the bent pipe 104b is bent. The bent tube 104b is mounted on the cart 105 in a sideways posture with the inner peripheral side 114 facing the left and right sides of the carriage 105 and the bent outer periphery 115 of the bent tube 104b facing the other left and right sides of the cart 105. . Therefore, the width dimension W in the left-right direction of the bent pipe 104b placed on the carriage 105 is larger than the outer diameter dimension of the bent pipe 104b, and when the carriage 105 passes through the curved path portion 103 of the sheath pipe 101, the bent pipe 104b. There is a problem in that the bent tube 104b and the sheath tube 101 are damaged by the end portions of the tube tube contacting the inner peripheral surface of the sheath tube 101.

  Further, in the non-open cutting method, when the diameter of the sheath tube 101 is made as small as possible, the amount of excavated soil due to excavation work by the shield machine is reduced, and the burden of labor and cost for transporting to other places for use in landfill etc. is reduced. However, when the diameter of the sheath tube 101 is reduced, when the bent tube 104b is rotated as described above, as shown in FIG. 34, the inner peripheral surface of the sheath tube 101 is reduced. It is difficult to secure a sufficiently large suspension space 116 for suspending both winders 107 and 108 between the outer periphery of the bent pipe 104b. For this reason, there is a problem that it is difficult to reduce the diameter of the sheath tube 101.

  The present invention is a pipe laying method capable of preventing the bent pipe and the sheath pipe from being damaged when the bent pipe is transported by the carriage, and capable of reducing the diameter of the sheath pipe and It aims at providing the jig for rotation.

In order to achieve the above object, according to the first aspect of the present invention, a plurality of carry-in pipes are carried into a sheath pipe having a curved path portion and transported by a carriage, and these carry-in pipes are connected to each other, thereby bending the curved path portion. A pipe laying method for laying a main pipe line having a sheath pipe inside a sheath pipe,
When the carry-in pipe is a bent pipe, carry the bent pipe on the carriage with the carrying posture with the outer circumference side of the bend facing downward,
A bent pipe is rotated from a carrying posture to a predetermined direction and connected to an already brought-in pipe already laid in the sheath pipe.

  According to this, in order to carry the bent pipe on the carriage with the carrying posture with the outer periphery side of the bend facing downward, the width dimension in the left-right direction of the bent pipe placed on the carriage is larger than the outer diameter dimension of the bent pipe Never do. Therefore, when the carriage passes through the curved path portion of the sheath tube, it is possible to prevent the bent tube and the sheath tube from being damaged by the end portion of the curved tube coming into contact with the inner peripheral surface of the sheath tube.

  The pipe laying method according to the second aspect of the present invention is to lay the bent pipe after repeating the process of rotating the bent pipe and the process of correcting the deviation of the axis of the bent pipe with respect to the axis of the already installed pipe. It is to be connected to a completed carry-in tube.

According to this, the bent pipe is connected in a predetermined direction to the laid-in carry-in pipe without deviation.
The pipe laying method according to the third aspect of the present invention is such that the first rotating jig is attached in the end portion of the laid carry-in pipe,
In the one end part of the bent pipe connected to the end part of the laying-in carry-in pipe, the second rotation jig is attached to face the first rotation jig,
A telescopic connecting member is detachably connected between the first rotating jig and the second rotating jig,
One end part expansion / contraction process for extending / contracting the connecting member, and one end replacement process for changing the connecting position between the connecting member and the first rotating jig and the connecting position between the connecting member and the second rotating jig are alternately performed. By doing so, the bent pipe is rotated in a predetermined direction from the transporting posture and connected to the laid-in carry-in pipe.

  According to this, it is possible to rotate the bent pipe in one direction by alternately performing the one-end expansion / contraction process and the one-end replacement process, and further correct the positional deviation of the bent pipe with respect to the installed carry-in pipe. it can.

  In addition, since the first and second rotating jigs are attached in the end of the already installed pipe and in the one end of the bent pipe, the space between the inner peripheral surface of the sheath pipe and the outer peripheral surface of the bent pipe is provided. The diameter of the sheath tube can be reduced.

The pipe laying method according to the fourth aspect of the present invention is the first rotation jig and the second rotation with the two connecting members arranged in parallel so that the rotation center of the bent pipe is positioned between the two connecting members. Connect between the jig and
In the one-end extension / contraction stroke, one of the connecting members is shortened, the other connecting member is extended, and the bent tube is rotated.

In the pipe line laying method according to the fifth aspect of the present invention, the two connecting members are connected between the first rotating jig and the second rotating jig in a crossed state.
In the one-end extension / contraction stroke, one of the connecting members is shortened, the other connecting member is extended, and the bent tube is rotated.

In the pipe laying method according to the sixth invention, a third rotating jig is attached in the other end of the bent pipe,
An extendable connecting member is detachably connected between the third rotation jig and the inside of the sheath tube,
The other end portion extending / contracting process for expanding / contracting the connecting member, and the other end replacement process for changing the connecting position between the connecting member and the third rotating jig and the connecting position between the connecting member and the inside of the sheath tube, By alternately performing in synchronism with the part expansion / contraction and the replacement process, the bent pipe is rotated from the carrying posture to a predetermined direction.

  According to this, the one end part expansion process and the one end part replacement process are alternately performed, and the other end part expansion process and the other end part replacement process are alternately performed in synchronization with these processes. The bent pipe can be rotated at both ends of the pipe, and the position deviation of the bent pipe with respect to the already installed carry-in pipe can be corrected.

The seventh invention is a rotating jig used in the pipe laying method according to any one of the first to sixth inventions,
The frame body is detachably fitted into the end of the tube,
The connection part which can connect the edge part of a connection member so that attachment or detachment is possible is formed in the several places of the flame | frame body in a pipe circumferential direction.

  According to this, the expansion / contraction stroke | compression process can be performed by connecting the edge part of a connection member to the connection part of a frame body, and extending / contracting a connection member. Moreover, the replacement | exchange process can be performed by removing the edge part of a connection member from the connection part of a frame body, and connecting to another connection part.

  As described above, according to the present invention, it is possible to prevent the bent tube and the sheath tube from being damaged when the bent tube is transported by the carriage, and it is possible to reduce the diameter of the sheath tube. is there.

It is the figure which looked at the pipe line laid by the pipe line laying method in 1st embodiment of this invention from the side. It is the schematic which looked at the curved path part of the pipe line from the top same as the above. It is a perspective view of the segment which comprises a sheath tube equally. It is a front view of the trolley | bogie used in the pipe line laying method similarly, and shows the state which is carrying a carrying-in pipe. It is a side view of the trolley | bogie used in the pipe line laying method similarly, and shows the state which is carrying the curved pipe (carry-in pipe). FIG. 6 is a front view of a rotation jig used in the pipe laying method, showing a state where the jig is attached to an end portion of the carry-in pipe. FIG. 4 is a side view of a rotation jig used in the pipe laying method, showing a state where the jig is attached to an end portion of the carry-in pipe. FIG. 6 is a side view showing a method of rotating a bent pipe using first to third rotating jigs and a connecting member in the pipe laying method. FIG. 5 is a schematic perspective view showing a method of rotating a bent pipe using first to third rotating jigs and a connecting member in the pipe laying method. FIG. 5 is a plan view when the bent pipe is carried on a carriage in the pipe laying method. FIG. 9 is a schematic diagram illustrating a process of rotating a bent pipe in the pipe laying method, and is a view taken along the line XX in FIG. 8. It is the schematic explaining the stroke | process which rotates a bending pipe in a pipe line laying method. FIG. 5 is a schematic diagram for explaining a process of correcting deviation of a bent pipe in the pipe laying method. FIG. 6 is a schematic view after correcting the deviation of the bent pipe in the pipe laying method. It is the schematic explaining the stroke | process which rotates a bending pipe in a pipe line laying method. FIG. 5 is a schematic diagram for explaining a process of correcting deviation of a bent pipe in the pipe laying method. FIG. 6 is a schematic view after correcting the deviation of the bent pipe in the pipe laying method. It is the schematic explaining the stroke | process which rotates a bending pipe in a pipe line laying method. FIG. 5 is a schematic diagram for explaining a process of correcting deviation of a bent pipe in the pipe laying method. In the same way, in the pipe laying method, it is a schematic view after correcting the deviation of the bent pipe, and shows a state where the bent pipe is rotated to the connection posture. FIG. 6 is a plan view showing a process of connecting a bent pipe that has been rotated to a connection posture to a laid-in carry pipe in the pipe laying method. It is the schematic explaining the process of rotating a curved pipe in the pipe-laying method in 2nd embodiment of this invention. It is the schematic explaining the stroke | process which rotates a bending pipe in a pipe line laying method. FIG. 5 is a schematic diagram for explaining a process of correcting deviation of a bent pipe in the pipe laying method. FIG. 6 is a schematic view after correcting the deviation of the bent pipe in the pipe laying method. It is the schematic explaining the stroke | process which rotates a bending pipe in a pipe line laying method. FIG. 5 is a schematic diagram for explaining a process of correcting deviation of a bent pipe in the pipe laying method. FIG. 6 is a schematic view after correcting the deviation of the bent pipe in the pipe laying method. It is the schematic explaining the stroke | process which rotates a bending pipe in a pipe line laying method. FIG. 5 is a schematic diagram for explaining a process of correcting deviation of a bent pipe in the pipe laying method. In the same way, in the pipe laying method, it is a schematic view after correcting the deviation of the bent pipe, and shows a state where the bent pipe is rotated to the connection posture. It is a schematic diagram for demonstrating the conditions for generating rotational torque to a curved pipe in the pipe-laying method in 1st and 2nd embodiment of this invention. In the conventional pipe-laying method, it is a top view at the time of carrying a curved pipe on a trolley | bogie. It is a side view which shows the method to rotate a bending pipe in the same pipe laying method.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
In the first embodiment, as shown in FIG. 1, the sheath tube 1 is formed by connecting a plurality of segments 2, and is buried in the ground. As shown in FIG. 3, each segment 2 includes an outer plate portion 4 curved in an arc shape, a pair of main girders 5, a pair of joint plates 6, and a plurality of reinforcing members 8. The main girder 5 has an inner flange shape, and is provided at both end portions of the outer plate portion 4 in the tube length direction A of the sheath tube 1 so as to protrude inward. By connecting the main beams 5 of the plurality of segments 2 with bolts, nuts or the like, the plurality of segments 2 are connected in the pipe length direction A as shown in FIG. In the main beam 5, a plurality of bolt holes 7 are formed at predetermined intervals in the circumferential direction.

  The joint plate 6 is provided so as to protrude inward at both end portions of the outer plate portion 4 in the circumferential direction B of the sheath tube 1. By connecting the joint plates 6 of the plurality of segments 2 with bolts, nuts or the like, the plurality of segments 2 are connected in the circumferential direction B as shown in FIG.

  As shown in FIGS. 1 and 2, a main pipe 9 such as a water pipe is laid in the sheath pipe 1, and the sheath pipe 1 and the main pipe 9 have a curved path portion 10 that is curved left or right. doing. The main line 9 is formed by connecting a plurality of carry-in pipes 11. There are two types of carry-in pipes 11, a straight pipe 11 a and a bent pipe 11 b, and the bent pipe 11 b is installed in the curved path portion 10. Each of the straight pipe 11a and the bent pipe 11b has a receiving port 14 at one end and an insertion port 15 at the other end. The bent tube 11b is a tube curved in an arc shape with a predetermined radius of curvature, and has a bent outer peripheral side 16 and a bent inner peripheral side 17.

  As shown in FIG. 4 and FIG. 5, a carriage 18 that carries the carry-in tube 11 is provided in the sheath tube 1. The carriage 18 includes a vehicle body 21 having a plurality of wheels 20, a receiving part 22 that receives the carry-in pipe 11, and a jack device 24 that lifts the carry-in pipe 11 received by the receiving part 22. It can run on a rail 23 laid in the sheath tube 1.

  As shown in FIGS. 6 and 7, 31 to 33 are first to third rotating jigs used for rotating the bent pipe 11 b when the main pipe line 9 is laid in the sheath pipe 1. . Each of the first to third rotating jigs 31 to 33 has an annular frame body 35 and expansion / contraction means 34 for expanding and contracting the frame body 35 in the radial direction.

  The frame body 35 is divided into two semicircular divided frames 36 and 37. Further, each of the divided frames 36 and 37 is divided into arc-shaped frame pieces 38a, 38b, 39a, and 39b. Each of the frame pieces 38a, 38b, 39a, 39b is obtained by bending a grooved steel material into an arc shape. A member 48 is provided.

  Among these, both frame pieces 38a, 38b are connected via a joint 40 made of bolts, nuts, etc., whereby one divided frame 36 is formed. Similarly, both frame pieces 39a and 39b are connected via a joint 40, whereby the other divided frame 37 is formed.

  The expansion / contraction means 34 includes end plates 41, 42 provided at both ends in the circumferential direction of one divided frame 36 and both ends in the circumferential direction of the other divided frame 37, and one of the divided frames 36 facing each other. A plurality of bolts 43 and nuts 44 for connecting the end plate 41 and the end plate 42 of the other divided frame 37 are provided. By turning the bolts 43, the distance between the one end plate 41 and the other end plate 42 is expanded and contracted, and the diameter of the frame body 35 can be expanded and contracted in one direction C. The frame body 35 has a plurality of connection holes 47 (an example of connection portions) formed at a plurality of locations in the circumferential direction B.

  As shown in FIGS. 8 and 9, 51 and 52 are telescopic connecting members used together with the first to third rotating jigs 31 to 33 when rotating the bending tube 11 b. The connecting members 51 and 52 are respectively provided with chains 51c and 52c having hooks 51a, 51b, 52a and 52b at both ends, and lengths between both ends of the chains 51c and 52c by winding or feeding the chains 51c and 52c. And take-up machines 51d and 52d (for example, lever block (registered trademark)).

Hereinafter, the operation of the above configuration will be described.
As the pipe laying method using the non-open cutting method, first, while excavating the tunnel in the ground using a small shield machine, as shown in FIG. And the joint plate 6 is connected, and the sheath tube 1 is formed. Thereafter, the rail 23 is laid in the sheath tube 1, the carriage 18 is arranged on the rail 23, a plurality of carry-in pipes 11 are carried into the sheath pipe 1 and transported by the carriage 18, and the carry-in pipes 11 are connected to each other. And the main line 9 is laid.

  As shown in FIG. 5, when the carry-in tube 11 is transported by the carriage 18, if the carry-in tube 11 is the bent tube 11b, the inner peripheral side 17 of the curve is directed upward and the outer peripheral side 16 of the curve is directed downward. The bent pipe 11b is placed on the receiving portion 22 of the carriage 18 and transported in the transported posture. At this time, the bent pipe 11b is fixed to the carriage 18 with a fixing wire or the like so that the bent pipe 11b does not roll carelessly on the carriage 18.

  Thereby, as shown in FIG. 10, the width dimension W in the left-right direction of the bent pipe 11b mounted on the carriage 18 does not increase beyond the outer diameter dimension of the bent pipe 11b. It is possible to prevent the bent tube 11b and the sheath tube 1 from being damaged by the end of the bent tube 11b coming into contact with the inner peripheral surface of the sheath tube 1 when passing through the curved path portion 10.

  In this way, after the bent pipe 11b is transported to a predetermined place in the sheath pipe 1 by the carriage 18, the bent pipe 11b is transported to the already brought-in carry pipe 11 that is already connected and laid in the sheath pipe 1. To a connection posture (an example of a predetermined orientation). In this case, the connection posture means that the bent pipe 11b is rotated 90 ° from the carrying posture, and as shown in FIG. 2, the outer peripheral side 16 of the bend is directed to either the left or right side and the inner peripheral side of the bend. 17 is a posture toward the other side.

The operation | work which rotates the bending pipe 11b as mentioned above is performed by the following methods using the jig | tool 31-33 for 1st-3rd and the connection members 51 and 52. FIG.
As shown in FIGS. 6 and 7, the bolt 43 of the expansion / contraction means 46 of the first rotation jig 31 is turned to shorten the distance between both end plates 41, 42, and the diameter of the frame body 35 is set to one direction. Reduce at C. In this state, the first rotation jig 31 is fitted into the distal end portion of the already-installed carry-in tube 11, and the bolt 43 is turned in the reverse direction to extend the distance between the two end plates 41, 42, and the frame body. The diameter of 35 is expanded in one direction C.

  As a result, the frame body 35 is pressed against the inner peripheral surface of the distal end portion of the carry-in tube 11 that has been laid through the protective member 48, and the first rotation jig 31 is firmly laid on the distal end of the carry-in tube 11 that has been laid. Installed in the department.

  Further, in the same manner as described above, as shown in FIG. 8, the second rotation jig 32 is attached in one end portion of the bent tube 11b, and the third rotation jig 33 is attached in the other end portion of the bent tube 11b. Thereafter, the fixing wire is removed from the carriage 18, the bent tube 11 b is lifted by the jack device 24 of the carriage 18, the support member 55 is inserted below the bent tube 11 b, and the bent tube 11 b is placed on the support member 55 by the jack device 24. Then, the carriage 18 is pulled out from below the bent pipe 11b. Thereby, the bending pipe 11b is supported by the support member 55, and is arrange | positioned facing the front-end | tip part of the laying-in carry-in pipe 11. FIG.

  As shown in FIGS. 8 and 9, at one end S1 of the bent pipe 11b, one hook 51a of one connecting member 51 is hooked in the upper connection hole 47 of the first rotating jig 31, and the other The hook 51b is hooked in the lower connection hole 47 of the second rotation jig 32. Similarly, one hook 52a of the other connecting member 52 is hooked in the upper connection hole 47 of the first rotation jig 31, and The other hook 52 b is hooked in the lower connection hole 47 of the second rotation jig 32, and the connecting members 51 and 52 are connected between the upper part of the first rotation jig 31 and the lower part of the second rotation jig 32. Connect between. At this time, as shown in FIG. 11, the first and second members are connected in parallel so that the rotation center O of the bent tube 11b is positioned between the two connection members 51 and 52. The rotation jigs 31 and 32 are detachably connected.

  Further, as shown in FIGS. 8 and 9, at the other end S <b> 2 of the bent tube 11 b, one hook 51 a of the other connecting member 51 is connected to the upper bolt of the main girder 5 of the segment 2 of the sheath tube 1. The hook 51b is hooked in the hole 7 (see FIGS. 3 and 4), and the other hook 51b is hooked in the lower connection hole 47 of the third rotation jig 33. Similarly, one hook 52a of another other connecting member 52 is hooked. Is hooked into the upper bolt hole 7 of the main girder 5 of the segment 2 of the sheath tube 1, and the other hook 52b is hooked into the lower connection hole 47 of the third rotation jig 33, so that the two other connecting members 51, 52 is connected between the third rotation jig 33 and the inside of the sheath tube 1. At this time, the lower portion of the third rotation jig 33 and the sheath tube are placed in a state where the connecting members 51 and 52 are arranged in parallel so that the rotation center O of the bent tube 11b is positioned between the connecting members 51 and 52. 1 is detachably connected to the inside upper part of 1.

  Thereafter, on one end S1 of the bent pipe 11b, the winding machines 51d and 52d of the connecting members 51 and 52 are operated so that the length between both ends of the chain 51c of one connecting member 51 is as shown in FIG. The length between the both ends of the chain 52c of the other connecting member 52 is extended. As a result, a rotational torque in one direction D is generated in the second rotation jig 32. In this manner, the process of expanding and contracting the connecting members 51 and 52 on the one end part side S1 of the bent pipe 11b is described as one end part extending and contracting process.

  Similarly, also on the other end side S2 of the bent pipe 11b, the winding machines 51d and 52d of the other connecting members 51 and 52 are operated, and the length between both ends of the chain 51c of one connecting member 51 is increased. It shortens and the length between the both ends of the chain 52c of the other connection member 52 is expanded. Thereby, a rotational torque in one direction D is generated in the third rotation jig 33. In addition, the stroke | stretching process of another connection member 51 and 52 in the other end part side S2 of the bending pipe 11b is described as an other end part expansion / contraction process.

  By performing the one end part expansion / contraction stroke and the other end extension / contraction stroke in synchronization with each other, a rotational torque in one direction D is generated at both end portions of the bent pipe 11b, and the bent pipe 11b is moved in one direction D from the conveying posture. And a predetermined angle α (for example, about 30 ° in FIG. 12).

  When the bent tube 11b is rotated as described above, as shown in FIG. 12, the axis of the bent tube 11b is shifted to the left and right with respect to the axis of the installed carrying tube 11, so that the first rotation The second rotation jig 32 is shifted to the left and right with respect to the jig 31, and similarly, the third transfer jig 33 is shifted to the left and right with respect to the main beam 5 of the segment 2. On the other hand, at one end S1 of the bent pipe 11b, the hooks 51a, 51b, 52a, 52b of the connecting members 51, 52 are removed from the connection hole 47 and hooked into another connection hole 47, as shown in FIG. In addition, the connection position between one end of the coupling members 51 and 52 and the first rotation jig 31 and the connection position between the other end of the coupling members 51 and 52 and the second rotation jig 32 are changed. In addition, this process is described as an end part replacement process.

  Similarly, on the other end side S2 of the bent pipe 11b, the connection position between one end of another connecting member 51, 52 and the main beam 5 of the segment 2, and the other end of the connecting member 51, 52 and the third diversion treatment. The connection position with the tool 33 is changed. In addition, this process is described as an other end part replacement process.

  After performing the one end part replacement process and the other end part replacement process as described above, as shown in FIG. 14, the length of the chain 51c of one of the connection members 51 remains unchanged, and the other connection process is performed. By shortening the length of the chain 52 c of the member 52, the second rotation jig 32 is shifted to the left and right with respect to the first rotation jig 31, and the third transfer jig 33 is the main girder of the segment 2. 5, and the bent pipe 11 b is shifted to the left and right with respect to the installed carry-in pipe 11, thereby correcting the left and right displacement of the bent pipe 11 b with respect to the installed carry-in pipe 11. be able to. As a result, the bent tube 11b is in a posture rotated by a predetermined angle α (for example, 30 ° in FIG. 14) around the rotation axis from the conveying posture in a state where the left-right displacement is corrected.

  Thereafter, as shown in FIG. 15, the one end D expansion / contraction stroke and the other end expansion / contraction stroke are performed in synchronization with each other, thereby generating a rotational torque in one direction D at both ends of the bent tube 11b. The bent tube 11b is rotated in one direction D by a predetermined angle α (for example, about 60 ° from the conveying posture in FIG. 15).

  Thereafter, as shown in FIG. 16, after the one end part replacement process and the other end part replacement process are performed in synchronization, as shown in FIG. 17, the chain of one connecting member 51 is changed. The length of 51c is left as it is, and by shortening the length of the chain 52c of the other connecting member 52, the bent pipe 11b is shifted to the left and right, and the left and right displacement of the bent pipe 11b with respect to the installed carry-in pipe 11 Correct. As a result, the bent tube 11b is in a posture rotated by a predetermined angle α (for example, 60 ° in FIG. 17) around the rotation axis from the transport posture in a state where the left-right displacement is corrected.

  After that, as shown in FIG. 18, the one end part expansion / contraction process and the other end part expansion / contraction process are performed in synchronization with each other, and then, as shown in FIG. 19, the one end part replacement process as described above. And the other end replacement process in synchronism, as shown in FIG. 20, by shortening the lengths of the chains 51c and 52c of the one and the other connecting members 51 and 52, the bent pipe 11b is In a state in which the left / right displacement is corrected, the connection posture is rotated from the transport posture around the rotation axis. In this case, the connection posture of the bent tube 11b is a posture rotated 90 ° in one direction D from the transport posture, but is not limited to 90 ° and may be a rotation angle other than 90 °.

  As described above, the one end part extension process and the other end part extension process are performed in synchronization, and then the one end part replacement process and the other end part replacement process as described above are performed in synchronization, and the bent pipe The process of rotating 11b and the process of correcting the deviation of the bent pipe 11b are repeated, and the bent pipe 11b is connected to the laid-in carry-in pipe 11 with the orientation changed from the transporting posture to the connected posture.

  At this time, as shown in FIG. 21, the other hooks 51b, 52b of the connecting members 51, 52 on the one end S1 side of the bent pipe 11b are removed from the connection holes 47 of the second rotation jig 32, and the other The pull-in wires 56 are connected to the hooks 51b and 52b, respectively, and the locking members 57 provided at the tips of the pull-in wires 56 are locked to the other end of the bent tube 11b (the opening end of the receiving port 14). . Thereafter, by operating the winders 51d and 52d of both the connecting members 51 and 52 to shorten the length between both ends of the chains 51c and 52c, the bent pipe 11b is drawn and installed. 11 and connected.

  In the pipe laying method as described above, as shown in FIG. 8, the first rotation jig 31 is attached in the distal end portion of the layed carry-in pipe 11, and the second and third rotation jigs 32, Since 33 is attached in the both ends of bent tube 11b, space 58 between the inner peripheral surface of sheath tube 1 and the outer peripheral surface of bent tube 11b can be reduced, and the diameter of sheath tube 1 can be reduced. Is possible.

(Second embodiment)
In the second embodiment, as shown in FIG. 22, at the one end S1 of the bent tube 11b, the two connecting members 51 and 52 are crossed and the first rotating jig 31 and the second rotating member 31 are connected. It connects between the jig | tool 32 for rotation. In addition, at the other end S2 of the bent pipe 11b, another two connecting members 51 and 52 are connected between the third rotation jig 33 and the main beam 5 of the segment 2 in a crossed state. .

  Thereafter, as in the first embodiment, the one end part expansion / contraction process (see FIGS. 23, 26, and 29) and the other end part expansion / contraction process are performed in synchronization, and then the one end part replacement as described above is performed. The process (see FIGS. 24, 27, and 30) and the process of changing the other end are performed in synchronization, and the process of rotating the bent pipe 11b and the process of correcting the deviation of the bent pipe 11b are repeated, and FIG. As shown in Fig. 4, the bent pipe 11b is changed from the transporting posture to the connected posture, and the bent tube 11b in the connected posture is connected to the laying-in carry-in tube 11.

  In the first and second embodiments, as shown in FIGS. 32 (a) and 32 (b), an axis 60 passing through the rotation center O of the bent tube 11b and one connecting member 51 or the other connecting member. When 52 is on the same plane 61, no rotational torque is generated in the bent tube 11b, and the bent tube 11b cannot be rotated. Therefore, in order to generate a rotational torque in the bent pipe 11b, the connecting members 51, 52 are arranged so that the shaft center 60 and one connecting member 51 or the other connecting member 52 are not included on the same plane 61. It is necessary to connect to the first and second rotating jigs 31 and 32. The connecting members 51 and 52 are also on the same plane when passing over the rotation center O of the bent tube 11b. In such a case, both end portions of one connecting member 51 and both end portions of the other connecting member 52 are shifted in the circumferential direction B, and the connecting members 51, 52 are moved to the first and second rotating jigs 31, 32 need to be connected.

  In the first and second embodiments, as shown in FIG. 8, the third rotation jig 33 is attached in the other end of the bent tube 11b, and the one end S1 and the other end of the bent tube 11b. The bent tube 11b is rotated with respect to the side S2, but in particular when the bent tube 11b is small, the third rotation jig 33 is not used, and the bent tube 11b is bent only at one end S1. The tube 11b may be rotated.

  In the first and second embodiments, when the bent tube 11b is rotated from the transporting posture to the connecting posture, the rotating operation is performed in three steps of 30 °, but the rotation in one rotating operation is performed. The angle may be other than 30 °, and the rotation operation may be performed in a plurality of times other than three times, or may be performed once.

  In the first and second embodiments, as shown in FIGS. 8 and 9, the connecting members 51 and 52 wind up or send out the chains 51c and 52c (an example of a wire rod) and the chains 51c and 52c, respectively. However, instead of the chains 51c and 52c, a wire or the like may be used instead of the chains 51c and 52c. Further, instead of the chains 51c and 52c, connecting members 51 and 52 having a rod material that can be expanded and contracted and having a cylinder device or the like for expanding and contracting the rod material may be used instead of the winders 51d and 52d. Also in this case, in order to generate a rotational torque in the bent pipe 11b, the connecting member 51, the shaft 60 and the one connecting member 51 or the other connecting member 52 are not included on the same plane 61. 52 needs to be connected to the first and second rotating jigs 31 and 32.

DESCRIPTION OF SYMBOLS 1 Sheath pipe 9 Main pipe line 10 Curved path part 11 Carrying pipe 11b Curved pipe 16 The outer periphery side 18 of a curve Bogies 31-33 1st-3rd rotation jig 35 Frame body 47 Connection hole (connection part)
51, 52 connecting member B circumferential direction O center of rotation

Claims (7)

Pipe line laying in which a plurality of carry-in pipes are carried into a sheath pipe having a curved path part and transported by a carriage, and these carry-in pipes are connected to each other and a main pipe line having a curved path part is laid in the sheath pipe. A method,
When the carry-in pipe is a bent pipe, carry the bent pipe on the carriage with the carrying posture with the outer circumference side of the bend facing downward,
A pipe laying method characterized in that a bent pipe is rotated and connected from a carrying posture to a predetermined direction to an already brought-in pipe already laid in a sheath pipe. After repeating the process of rotating the bent pipe and the process of correcting the deviation of the axis of the bent pipe with respect to the axis of the installed carry-in pipe, the bent pipe is connected to the installed carry-in pipe The pipe laying method according to claim 1. Attach the first rotation jig in the end of the laid carry-in pipe,
In the one end part of the bent pipe connected to the end part of the laying-in carry-in pipe, the second rotation jig is attached to face the first rotation jig,
A telescopic connecting member is detachably connected between the first rotating jig and the second rotating jig,
One end part expansion / contraction process for extending / contracting the connecting member, and one end replacement process for changing the connecting position between the connecting member and the first rotating jig and the connecting position between the connecting member and the second rotating jig are alternately performed. 3. The pipe laying method according to claim 1, wherein the bent pipe is rotated in a predetermined direction from the transporting posture and connected to the laid-in carry-in pipe. Connected between the first rotating jig and the second rotating jig in a state in which both the connecting members are arranged in parallel so that the rotation center of the bent tube is located between the two connecting members,
4. The pipe laying method according to claim 3, wherein, in the one-end extension / contraction stroke, one of the connecting members is shortened, the other connecting member is extended, and the bent pipe is rotated. Connect the two connecting members between the first rotation jig and the second rotation jig in a crossed state,
4. The pipe laying method according to claim 3, wherein, in the one-end extension / contraction stroke, one of the connecting members is shortened, the other connecting member is extended, and the bent pipe is rotated. Install the third rotation jig in the other end of the bent pipe,
An extendable connecting member is detachably connected between the third rotation jig and the inside of the sheath tube,
The other end portion extending / contracting process for expanding / contracting the connecting member, and the other end replacement process for changing the connecting position between the connecting member and the third rotating jig and the connecting position between the connecting member and the inside of the sheath tube, The pipe laying method according to claim 3, wherein the bent pipe is rotated in a predetermined direction from the transporting posture by performing alternately in synchronization with the part expansion and contraction and the replacement process. A rotation jig used in the pipe laying method according to any one of claims 1 to 6,
The frame body is detachably fitted into the end of the tube,
A rotating jig characterized in that connecting portions capable of detachably connecting the end portions of the connecting members are formed at a plurality of locations of the frame body in the pipe circumferential direction.

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