JP4229873B2 - Pipe laying equipment - Google Patents

Description

  The present invention relates to a pipe laying apparatus.

  In general, a pipe-in-pipe method (hereinafter referred to as a PIP method) that can be performed without cutting is often used as a method for laying pipes. In this PIP method, a start shaft and a reaching shaft are formed from the surface at each position corresponding to one end side and the other end side of the existing pipeline to be updated, and the existing pipeline is cut in each shaft. Then, a new pipe having a smaller diameter than that of the existing pipe line is inserted from the cut end of the existing pipe line with a hydraulic jack or the like, and the new pipe that follows the new pipe is received. This new tube is inserted into the existing tube in the same way as the first new tube, and the subsequent new tube is joined to the receiving port of this subsequent new tube. By repeating the above, the new pipe is propelled in the existing pipe line, and the new pipe is laid from the starting shaft to the reaching shaft. In addition to the above, as the PIP method, for example, a start shaft and a reach shaft are formed from the ground surface, and a pipe (sheath tube) having a diameter larger than that of the new tube is reached from the start shaft to the reach shaft. There is a method in which a new pipe is laid in the sheath pipe after the sheath pipe is laid while propelling the inside.

When the PIP method is used, even if there are roads, railways, rivers, etc. on the existing pipelines, excavation at locations other than vertical shafts is not necessary. The laying work can be carried out (see, for example, Patent Document 1), and the workability is better and the new pipe can be laid in a shorter time than when the new pipe is laid by the open-cut method.
JP 2002-327595 A

  As shown in FIG. 13, when the new pipe 2 is laid by the PIP method in the existing pipe line 1 which is inclined and piped by the PIP method as described above, the new pipe 2 to be laid is inserted for the convenience of piping. If it is necessary to direct the mouth 3 to the upper side of the gradient of the existing pipeline 1, the PIP method inserts the new pipe 2 into the existing pipeline 1 from the insertion port 3 side. It is necessary to provide the start shaft 4a, provide the reaching shaft 4b on the upper side of the gradient, and propel and install the new pipe 2 from the lower side of the gradient to the upper side.

  However, in such a case, there is a possibility that the new pipe 2 to be inserted into the existing pipeline 1 will slide down to the start shaft 4a side with the weight in the existing pipeline 1. For this reason, when the new pipe 2 is inclined, the PIP method cannot be adopted.

  Therefore, the present invention solves such a problem, and the new pipe inserted into the existing pipe is installed when the new pipe is inserted into the existing pipe that is inclined and is installed toward the upper side of the gradient of the existing pipe. An object of the present invention is to surely prevent sliding down to the side where the new pipe is inserted.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a base part provided in accordance with the inclination of the existing pipe line at a position opposite to the lower end part in the inclination direction in the existing pipe line which is inclined and piped. A feeding means that is fixed at a position opposite to the lower end portion and feeds a new pipe placed on the base portion from the insertion side into the existing pipe line, and is freely engageable with a receptacle of the new pipe When the new pipe is fed, the new pipe can be passed, and the new pipe passes, and a gap is formed between the new pipe and the feeding means, and a new pipe following the gap is formed. And a slip-off prevention means for preventing the passed new pipe from sliding down to the lower end side of the existing pipe line.

  According to such a configuration, when the new pipe is fed into the existing pipeline by the feeding means, the feeding means is fixed at a position facing the lower end portion in the inclination direction of the existing pipeline. Accordingly, it is possible to prevent the new pipe from sliding down to the lower end side when the new pipe is fed. Further, when a gap is formed between the new pipe that has passed through the slip-off preventing means and the feeding means and a subsequent new pipe is disposed in the gap, the slip-off preventing means is disposed on the new pipe that has passed. It is possible to prevent the new pipe that has passed through the receiving port from sliding down to the lower end side.

  The invention according to claim 2 is the jack laying device according to claim 1, wherein the feeding means is a jack for feeding a new pipe into the existing pipe line with a predetermined stroke so as not to move along the inclination of the base portion. And a feed force transmitting means for transmitting the feed force from the jack to the new pipe, and the length in the feed direction is the same as or shorter than the stroke of the jack. And a spacer that can be engaged with the base portion so as not to move along the inclination of the base portion, and one or more spacers are provided between the feeding force transmitting means and the jack. When the jack is operated and the new pipe is fed into the existing pipe line by one stroke, the feeding force is transmitted to the base portion. Or the spacer is returned to the initial state, and a new spacer is added to the gap between the feeding force transmitting means or the spacer and the jack in the engaged state. By eliminating the state, when the jack is operated, the new pipe can be fed into the existing pipe line deeper by the length of the added spacer. .

  According to such a configuration, when feeding a new pipe into an existing pipe line by a jack, the jack is fixed at a position facing the lower end portion in the inclined direction of the existing pipe line, It is possible to prevent the new pipe from sliding down to the lower end side when the new pipe is fed. Further, when the jack is operated and the new pipe is fed into the existing pipe line for one stroke, when adding a new spacer between the feeding force transmission means or the spacer and the jack, By applying the feeding force transmitting means or the spacer to the base portion, the new pipe can be prevented from sliding down to the lower end side of the existing pipe line, and the jack is returned to the initial state in this state. A spacer can be newly added to a gap formed between the feeding force transmission means or the spacer and the jack.

  According to a third aspect of the present invention, in the pipe laying device according to the first or second aspect, the slip-off preventing means includes a new pipe support portion having an inner surface having a shape corresponding to the outer surface of the new pipe, and the new pipe support. A gap portion formed in a penetrating state from the outer surface to the inner surface of the portion, and a slip-off prevention plate inserted into the gap portion and having a tip projecting from the inner surface. By preventing the tip of the slip-off prevention plate from protruding from the inner surface at the time of feeding, the new pipe can pass through the new pipe support, and the slip-off prevention plate when the new pipe passes through the new pipe support. By projecting the tip of the tube from the inner surface, the tip can be engaged with the receptacle of the new tube.

  According to such a configuration, when the new pipe is fed, the tip of the slip-off prevention plate is not protruded from the inner surface of the new pipe support part, so that the new pipe can pass through the new pipe support part. When the pipe passes through the new pipe support part, the tip of the slip-off prevention plate protrudes from the inner surface of the new pipe support part, so that the tip of the slip-off prevention plate contacts the inlet of the new pipe It is possible to prevent the new pipe from sliding down to the lower end side of the existing pipe line.

  According to a fourth aspect of the present invention, in the pipe laying device according to any one of the first to third aspects, the new apparatus is provided on the lower end side in the inclination direction of the existing pipe and is fed into the existing pipe. It has an anti-lifting means for contacting the outer surface of the upper part of the pipe and preventing the new pipe from floating in the feeding direction when the new pipe is fed.

  According to such a configuration, the rising prevention means is provided on the lower end portion side in the inclination direction of the existing pipe line, and comes into contact with the outer surface of the upper part of the new pipe fed into the existing pipe line. When the pipe is fed, the new pipe can be prevented from floating in the feeding direction, and the new pipe can be fed smoothly.

  As described above, according to the present invention, when a new pipe is inserted and installed in the existing pipe that is inclined and is installed above the gradient of the existing pipe, the new pipe inserted into the existing pipe is replaced with the new pipe. It is possible to reliably prevent sliding down to the side where the tube is inserted.

  A conduit laying device 10 according to an embodiment of the present invention will be described with reference to FIGS. This pipe laying apparatus 10 is a case where a new pipe 2 is laid in an existing pipe line 1 which is inclined and piped by the PIP method, and the new pipe 2 is inclined to the existing pipe line 1 for the convenience of the pipe. Used when laying from the bottom to the top. Before entering the laying operation of the new pipe 2, as shown in FIG. 13, the starting shaft 4a and the reaching shaft 4b are formed, and both ends of the existing pipe line 1 are cut in each shaft. In addition, the same code | symbol is attached | subjected to the thing similar to what was demonstrated in FIG. 13, and the detailed description is abbreviate | omitted.

  As shown in FIG. 1 and FIG. 2, the pipe laying device 10 has an existing pipe line at a position facing the lower end portion 1a in the inclined direction of the existing pipe line 1 that is inclined and piped, that is, the end on the start shaft 4a side. 1, a base portion 11 provided in accordance with the inclination of 1, a hydraulic jack 13 as a feeding means that is fixed to the base portion 11 and feeds the new pipe 2 into the existing pipe line 1 from the insertion port 3 side, and a base A two-stage strut 14 provided on the portion 11 and serving as a feeding force transmitting means for directly transmitting the feeding force from the hydraulic jack 13 to the receiving port 12 of the new pipe 2, and a two-stage strut on the base portion 11 14 and the hydraulic jack 13, a strut 15 as a spacer that can be arranged in a state where one or a plurality of the jacks are continuous, and a new one that is fixed to the existing pipeline 1 side in the base 11. The new pipe 2 is allowed to pass through when the new pipe 2 is fed, and when the new pipe 2 passes, the new pipe 2 passes through the inlet 12 of the new pipe 2 that has passed therethrough. An anti-slip jig 16 serving as a slip-off preventing means for preventing the new pipe 2 passing through and slipping down to the lower end 1a side of the existing pipe 1 and an outer periphery of the lower end 1a in the existing pipe 1 It is provided in a fitted state and contacts the outer surface of the upper part of the new pipe 2 that is fed into the existing pipe line 1 to prevent the new pipe 2 from being lifted in the feeding direction when the new pipe 2 is fed. And a lifting prevention jig 17 as a lifting prevention means.

  As shown in FIGS. 1 to 3, the base portion 11 includes a bottom plate 18 provided at a lower portion, a lower rail 19 fixed to the bottom plate 18 with bolts and nuts (not shown), and a lower rail 19. And an upper rail 20 as a rail portion fixed by bolts and nuts (not shown).

  The lower rail 19 and the upper rail 20 are arranged in a state of being inclined in the same manner as the inclination of the existing pipe line 1, that is, parallel to the feeding direction of the new pipe 2. Two are formed to be parallel to each other, and are defined as first rail portions 19a and 20a and second rail portions 19b and 20b, respectively.

  The upper rail 20 is in a state shifted from the lower rail 19 on the opposite side to the existing pipeline 1 side (hereinafter referred to as the rear side), and at a predetermined distance from the existing pipeline 1 The rear end of the upper rail 20 is supported by a pipe laying device 10 and a concrete wall 21 for supporting the weight when the new pipe 2 is placed on the device 10. It is in a state. In addition, the existing pipe 1 side (hereinafter referred to as the front side) of the lower rail 19 is in a state of entering under the lower end portion 1a of the existing pipe 1 and leaning against the side wall of the start shaft 4a. Has been placed.

  On the upper surface of the upper rail 20 on the rear side of the first rail portion 20a and the second rail portion 20b, a hydraulic jack 13 is disposed, and the pressure bearing portion 20c that receives a reaction force when the hydraulic jack 13 is operated. Is formed. Accordingly, the hydraulic jack 13 is prevented from moving with respect to the feeding direction of the new pipe 2.

  In addition, the upper surfaces of the first rail portion 20a and the second rail portion 20b are penetrated through the upper surfaces of the rail portions 20a and 20b at a predetermined distance from the pressure bearing portions 20c and 20c on the front side. Through-holes 22 and 22 are formed, and these through-holes 22 and 22 have a predetermined interval d in the feeding direction, for example, an interval equal to the length s of one stroke of the hydraulic jack 13. , Formed at a plurality of locations.

  As shown in FIGS. 4A and 4B, the strut 15 disposed on the upper rail 20 has a hollow block shape with an open top surface, and both side surfaces 15a and 15a of the strut 15 are open. The lower part protrudes further downward than the bottom face 15b to form guide parts 15c and 15c.

  The bottom surface 15b is formed in the same width as the width of the first rail portion 20a (second rail portion 20b), and the strut 15 is formed on the first rail portion 20a (second rail portion 20b). When placed, each guide portion 15c can come into contact with each side surface of the first rail portion 20a (second rail portion 20b). As a result, it is possible to prevent the strut 15 from being warped in the feeding direction due to the influence of the feeding force acting on the strut 15 during the feeding operation of the new pipe 2. It can be moved along the rail portion 20a (second rail portion 20b). Therefore, the feeding operation of the new pipe 2 can be performed smoothly.

  In addition, through holes 15d and 15d corresponding to the through holes 22 and 22 formed in the first rail portion 20a (second rail portion 20b) are formed at, for example, two positions on the bottom surface 15b. Has been. By passing the pin 23 through the through-holes 15d and 15d in the strut 15 and the through-holes 22 and 22 in the first rail portion 20a (second rail portion 20b), the strut 15 has the first rail portion 20a. It can be applied to (second rail portion 20b) so as not to move in the feeding direction of the new pipe 2. At this time, as described above, since the upper surface of the strut 15 is open, the operation of passing the pin 23 as described above can be easily performed.

  Note that the dimension L1 in the feeding direction of the new pipe 2 in the strut 15 is formed in the same manner as the length s of one stroke of the hydraulic jack 13 in the case of the present embodiment. The dimension L1 in the feeding direction of the pipe 2 may be shorter than the length s of one stroke of the hydraulic jack 13. In this case, the distance d in the feeding direction in the through holes 22 and 22 formed in the first rail portion 20a (second rail portion 20b) is the dimension L1 in the feeding direction of the new tube 2 in the strut 15. Keep it.

  As shown in FIGS. 5 (a) and 5 (b), the two-stage strut 14 has a hollow block shape with an open top surface, and the first rail portion 20a (second rail portion 20b). The main body part 14a attached to the main body part 14a is provided on the front side of the main body part 14a so as to be shifted upward with respect to the main body part 14a, and is in contact with the end surface 12a of the receiving port 12 of the new pipe 2 A feed force transmission portion 14b that transmits the feed force from the hydraulic jack 13;

Lower portions of both side surfaces 14c and 14c of the main body portion 14a protrude further downward than the bottom surface 14d to form guide portions 14e and 14e.
The bottom surface 14d is formed in the same width as the width of the first rail portion 20a (second rail portion 20b), and the two-stage strut 14 has the first rail portion 20a (second rail portion). When attached from the front end side of 20b), each guide portion 14e can contact each side surface of the first rail portion 20a (second rail portion 20b). Thereby, it is possible to prevent the two-stage strut 14 from warping in the feeding direction due to the influence of the feeding force and the like acting on the two-stage strut 14 during the feeding operation of the new pipe 2.

  The length of the guide portions 14c and 14c in the direction perpendicular to the first rail portion 20a (second rail portion 20b) is larger than the thickness of the upper surface of the first rail portion 20a (second rail portion 20b). The lower ends of the guide portions 14c and 14c are formed in the first direction toward the center of the first rail portion 20a (second rail portion 20b) as seen in FIG. 5B. Claw portions 14f and 14f as lift prevention portions are formed so as to cover the upper surface of the rail portion 20a (second rail portion 20b).

  As described above, the claw portions 14f and 14f are formed in the main body portion 14a, so that the two-stage strut 14 is affected by the feeding force acting on the two-stage strut 14 during the feeding operation of the new pipe 2. However, the claw portions 14f and 14f are connected to the first rail portion 20a (second rail portion 20b) even if they are lifted from the first rail portion 20a (second rail portion 20b) in the feeding direction. It is possible to prevent the two-stage strut 14 from being lifted. Thereby, the feeding operation of the new pipe 2 can be performed smoothly.

  In addition, through holes 14g and 14g corresponding to the through holes 22 and 22 formed in the first rail portion 20a (second rail portion 20b) are formed at, for example, two positions on the bottom surface 14d. Has been. By passing the pin 23 through the through-holes 14g and 14g in the two-stage strut 14 and the through-holes 22 and 22 in the first rail portion 20a (second rail portion 20b), the two-stage strut 14 is formed. The first rail portion 20a (second rail portion 20b) can be engaged so as not to move in the feeding direction of the new pipe 2.

  In the case of the present embodiment, the dimensions of the main body portion 14a in the feeding direction of the new pipe 2 are the same as the length s of one stroke of the hydraulic jack 13, but in the main body portion 14a. The dimension of the new pipe 2 in the feeding direction may be shorter than the length s of one stroke of the hydraulic jack 13. In this case, the distance d in the feeding direction in the through holes 22 and 22 formed in the first rail portion 20a (second rail portion 20b) is the dimension in the feeding direction of the new tube 2 in the main body portion 14a. The strut 15 is formed so as to be equal to the dimension of the new tube 2 in the feeding direction.

  Further, the feeding force transmission portion 14b is provided in a state of being shifted upward with respect to the main body portion 14a via the ribs 14h and 14h, and as shown by an imaginary line 14b in FIG. The height of the feeding force transmitting portion 14b of the two-stage strut 14 attached to the upper rail 20 with respect to the end face 12a of the twelve is the anti-slip jig 16 (details will be described later) fixed to the lower rail 19. It is designed to be higher than the height. Thereby, the feeding force transmission part 14 b in the two-stage strut 14 can contact the end surface 12 a of the receiving port 12 at a position higher than the slip prevention jig 16.

  Also, as shown in FIGS. 6A to 6C, the anti-slip jig 16 is attached to a mounting plate 16a attached to the lower rail 19 by bolts and nuts (not shown). A new tube support portion 16c that is mounted on the plate 16a and has an inner surface 16b having a shape corresponding to the outer surface of the new tube 2, and anti-slip plates 24, 24 that can be inserted into the new tube support portion 16c (for details) (To be described later). Assuming that the outer diameter of the receiving port 12 is D1, the new tube supporting portion 16c allows the receiving port 12 of the new tube 2 to pass over the new tube supporting portion 16c as shown by the phantom line in FIG. It is formed as follows.

  The new tube support portion 16c and the attachment plate 16a are attached to a pair of ribs 16e for fixing the one surface 16d and the attachment plate 16a in the new tube support portion 16c, and the other surface 16f in the new tube support portion 16c. It is mutually fixed by a pair of rib 16g which fixes the board 16a. Unlike the pair of ribs 16g, the pair of ribs 16e is formed with a stepped portion 16h. When the anti-slip jig 16 is fixed to the lower rail 19, the pair of ribs 16e are connected to the existing pipe line 1. To face each other. Thereby, as shown in FIG.7 (b), the receiving port 12 of the new pipe | tube 2 can be stably mounted in this level | step-difference part 16h.

  As shown in FIGS. 6A to 6C, the new tube support portion 16c is formed with a gap portion 16k penetrating from the outer surface 16i to the inner surface 16b. The anti-slip plates 24, 24 can be inserted from both sides of the new tube support portion 16c.

  The anti-slip plates 24, 24 have an inner surface 24a having a shape corresponding to the outer surface of the new tube 2, and as shown in FIG. The inner portions 24b, 24b protrude from the inner surface 16b of the new tube support portion 16c when the slip-off prevention plates 24, 24 are inserted into the gap portion 16k of the new tube support portion 16c. As a result, as shown in FIGS. 7 (a) and 7 (b), the inner portions 24b and 24b can be brought into contact with the end surface 12a of the receiving port 12 in the new pipe 2, and the new pipe 2 is already installed. It is possible to prevent the pipe 1 from sliding down to the lower end 1a side. In FIGS. 6 and 7A, 16m indicates that when the slip-off prevention plates 24, 24 are inserted into the gap 16k of the new tube support portion 16c, the slip-off prevention plates 24 are in a predetermined position. It is a stopper for adjusting to become.

  As shown in FIGS. 1, 2, and 8, the lifting prevention jig 17 is attached to the outer periphery of the lower end portion 1 a of the existing pipe line 1 in an externally fitted state. The lifting prevention jig 17 is divided into two parts in the circumferential direction, and radially outward flanges 17c and 17c are formed at both ends in the circumferential direction of the respective halves 17a and 17b. Has been.

  Each flange portion 17c is formed with a through-hole 17d, and the halves 17a and 17b are arranged on the outer periphery of the lower end 1a of the existing pipe line 1 so as to sandwich the lower end 1a. A bolt 25 is passed through the through-hole 17d of 17a and the through-hole 17d of the half-divided body 17b, and a nut 26 is screwed to the bolt 25, so that the lifting prevention jig 17 is placed on the outer periphery of the lower end 1a of the existing pipe line 1 It is attached.

  When the lifting prevention jig 17 is attached to the lower end portion 1a of the existing pipeline 1, the upper half portion 17a is located radially outward from the half portion 17a at a position corresponding to the pipe top of the existing pipeline 1. The arm portion 17e is formed so as to protrude from the distal end portion thereof to a position exceeding the end face of the existing pipe line 1 in the pipe axis direction, and exceeds the end face of the existing pipe line 1 in the arm portion 17e. In a portion corresponding to the position (hereinafter referred to as a tip portion), a lifting prevention portion 17f that can contact the outer surface of the new tube 2 is formed.

  The lifting prevention portion 17f includes a screw hole 17g formed at the tip of the arm portion 17e, a screw portion 17i that can be screwed into the screw hole 17g, and has a handle portion 17h at one end, and other than the screw portion 17i. It has the receiving part 17j which can fit an end, and has the pressing part 17m which has the caster 17k which can contact the outer surface of the new pipe 2.

  Accordingly, the screw portion 17i is screwed into the screw hole 17g from the other end side, the other end side of the screw portion 17i screwed out from the screw hole 17g is fitted into the receiving portion 17j in the holding portion 17m, and the handle portion in the screw portion 17i is inserted. By adjusting 17h, the holding portion 17m can be freely moved in and out in the radial direction by the screw feeding mechanism.

  In the configuration as described above, in order to insert and lay the new pipe 2 into the existing pipe line 1 which is inclined and piped using the pipe laying apparatus 10, first, from the tip of the upper rail 20 The two-stage strut 14 is attached as shown in FIG. Then, while suspending the new pipe 2 with a crane or the like not shown, as shown in FIG. 9, the position of the end face of the insertion port 3 of the new pipe 2 is made to correspond to the end of the existing pipe line 1. 2 is disposed on the pipe laying apparatus 10 while being disposed between the first rail portion 20a and the second rail portion 20b in the upper rail 20.

  Then, while adjusting the stroke of the hydraulic jack 13, an appropriate number, in this case, two struts 15 are arranged at a position between the two-stage strut 14 and the hydraulic jack 13 on the upper rail 20. At this time, the lifting prevention portion 17f of the lifting prevention jig 17 is adjusted so that the pressing portion 17m slightly presses the outer surface of the insertion port 3 of the new tube 2.

  Next, the hydraulic jack 13 is operated to press the new pipe 2 along the upper rail 20 and start feeding the new pipe 2 into the existing pipe line 1. At this time, since the hydraulic jack 13 is prevented from moving with respect to the upper rail 20 in the feeding direction of the new pipe 2, the new pipe 2 tends to slide down to the lower end 1 a side of the existing pipe line 1. Can be surely prevented.

  Further, as described above, since the guide portions 15c and 15c are formed on the strut 15, the strut 15 is moved in the feeding direction due to the influence of the feeding force acting on the strut 15 when the new pipe 2 is fed. The strut 15 can be moved along the upper rail 20 while preventing the warp from being bent, and the new pipe can be fed smoothly. Moreover, since the guide portions 14e and 14e are formed in the two-stage strut 14, it is possible to prevent the two-stage strut 14 from being warped in the feeding direction when the new pipe 2 is fed. Further, since the claw portions 14f and 14f are formed in the two-stage strut 14, the two-stage strut is affected by the feeding force acting on the two-stage strut 14 during the feeding operation of the new pipe 2. 14 can be prevented from floating in the feeding direction, and the new pipe can be fed smoothly.

  When the new pipe 2 is fed into the existing pipeline 1 for one stroke of the hydraulic jack 13, as shown in FIG. 10, the through holes 15d and 15d in the strut 15 and the first rail portion 20a (first rail) The strut 15 is engaged with the first rail portion 20a (second rail portion 20b) through the pin 23 through the through holes 22, 22 in the second rail portion 20b).

  At this time, the through holes 22 and 22 in the first rail portion 20a (second rail portion 20b) are formed at predetermined intervals d along the feeding direction. Since the length of the stepped strut 14 is the same as the length of the main body portion 14a in the feeding direction, the through holes 15d and 15d in each strut 15 and the through holes 22 and 22 in the first rail portion 20a (second rail portion 20b). And the positions of the through holes 14g, 14g in the two-stage strut 14 and the positions of the through holes 22, 22 in the first rail portion 20a (second rail portion 20b) match. Therefore, the two-stage strut 14 and the strut 15 are engaged with the upper rail 20 so that the new pipe 2 can be prevented from sliding down to the lower end portion 1a side of the existing pipe line 1 due to its weight.

  When the two-stage strut 14 and the strut 15 are brought into contact with the upper rail 20, the hydraulic jack 13 is returned to the initial position, and a new strut 15 is inserted into the gap 27 for inserting the strut 15 formed at this time. to add.

  And although illustration is abbreviate | omitted, the additional strut 15 is arrange | positioned in the clearance gap 27 of the strut 15 and the hydraulic jack 13, and the two-stage strut 14 and the upper rail 20 and the strut 15 and the upper rail 20 are engaged. The pin 23 is removed to cancel each engagement state, the hydraulic jack 13 is operated again, and the new pipe 2 is further fed into the existing pipe line 1 for one stroke of the hydraulic jack 13.

  In this way, by increasing the number of struts 15 interposed between the two-stage struts 14 and the hydraulic jacks 13, the hydraulic jack 13 can feed the new pipe 2 into the existing pipe line 1. The length of the strut 15 can be adjusted to be deeper by one stroke of the hydraulic jack 13 in the above case.

  Then, when the new pipe 2 is further fed by one stroke into the existing pipe line 1 by the hydraulic jack 13, a gap 27 is formed between the two-stage strut 14 and the hydraulic jack 13 in the same procedure as described above. The strut 15 is further added to the gap 27, and the feeding operation of the new tube 2 is continued until the receiving port 12 of the new tube 2 passes over the anti-slip jig 16.

  At this time, as described above, the feeding force transmission portion 14b is provided in a state of being shifted upward with respect to the main body portion 14a via the ribs 14h and 14h, and the virtual line 14b in FIG. As shown in FIG. 1, the feeding force transmission portion 14 b in the two-stage strut 14 can contact the end surface 12 a of the receiving port 12 at a position higher than the anti-slip jig 16. When the receiving port 12 of the new pipe 2 passes through the anti-slip jig 16, the new pipe support portion 16 c of the anti-slip jig 16 is supported in a state where the receiving port 12 of the new pipe 2 is supported by the two-stage strut 14. The slip-off prevention plates 24, 24 are inserted into the gap 16k.

  Then, by adjusting the hydraulic jack 13 and eliminating the support state of the receiving port 12 by the two-stage strut 14, as shown in FIGS. 7A and 7B, the slip-off prevention plate 24 is removed. The inner portion 24b of the tube is brought into contact with the end surface 12a of the receiving port 12 of the new tube 2.

  At this time, the handle portion 17h of the lifting prevention jig 17 is adjusted in a state where the receiving port 12 of the new pipe 2 is stably placed on the step portion 16h of the new pipe support portion 16c of the slip prevention jig 16. By pushing the holding portion 17m radially inward and pressing the outer surface of the new pipe 2, the new pipe 2 can be sandwiched between the anti-slip jig 16 and the anti-lifting jig 17. It can be held in a more stable state.

  Then, as shown in FIG. 11, the strut 15 interposed between the two-stage strut 14 and the hydraulic jack 13 is removed, and the hydraulic jack 13 is returned to the initial position, and the subsequent new pipe is removed. A gap 28 for placement is formed.

  Then, as shown in FIG. 12, the succeeding new pipe 2 is suspended in a gap 28 (see FIG. 11) while being suspended by a crane or the like not shown, and the position and the leading side of the insertion opening 3 of the succeeding new pipe 2 are arranged. The position of the receiving port 12 of the new pipe 2 is made to correspond.

  Then, the slip-off prevention plates 24, 24 are removed from the gap 16k in the new pipe support 16c of the anti-slip jig 16, and the hydraulic jack 13 is operated to enter the inlet 12 of the new pipe 2 on the leading side. The insertion port 3 of the subsequent new tube 2 is inserted and joined.

  When the receiving port 12 of the leading new tube 2 and the insertion port 3 of the succeeding new tube 2 are joined, the succeeding new tube 2 is further pushed by the hydraulic jack 13, and the leading new tube 2 and the succeeding new tube 2 2 are fed into the existing pipeline 1 together.

  When the leading new pipe 2 and the succeeding new pipe 2 are fed into the existing pipe line 1 for one stroke of the hydraulic jack 13, the two-stage strut 14 and the hydraulic jack 13 are disposed in the same manner as described above. Struts 15 are added, and the leading new pipe 2 and the succeeding new pipe 2 are further fed into the existing pipe line 1. By repeatedly performing the above-described work, the new pipe 2 fed into the hydraulic jack 13 is surely prevented from sliding down to the lower end portion 1a side of the existing pipe line 1 and reaches the reaching shaft 4b from the starting shaft 4a. The new pipe 2 can be installed until

  In the above description, an example in which the new pipe 2 is laid in the existing pipe line 1 and the existing pipe line 1 is replaced is described. However, the present invention is not limited to this. From the starting shaft to the arrival shaft, the sheath pipe with a diameter larger than that of the new pipe is tilted while propelling the ground, and after the sheath pipe is installed, the new pipe is installed in the sheath pipe. It can also be applied to. Moreover, as a new pipe used in the above, you may use the pipe | tube which has a well-known earthquake resistance function.

It is a side view of the pipe laying device of an embodiment of the invention. It is a top view of the same installation apparatus. It is a disassembled perspective view of the base part in the laying apparatus. (A) is a side view which shows the state which strut | latched the upper rail with the pin, (b) is sectional drawing of Fig.4 (a). (A) is a side view showing a state where a two-stage strut is engaged with an upper rail by a pin, and (b) is a sectional view of FIG. 5 (a). (A) is a front view of a slip prevention jig, (b) is a plan view of the slip prevention jig, and (c) is a side view of the slip prevention jig. (A) is a figure which shows the state by which the slip-down prevention plate was inserted in the slip prevention jig | tool, (b) is a figure which shows the state in which the slip prevention jig | hook was applied to the end surface of a receiving port. It is a disassembled perspective view of a lifting prevention jig. It is a figure which shows the state which started the installation of a new pipe by the pipe-laying apparatus. It is a figure which shows the state which adds a strut. It is a figure which shows the state which formed the clearance gap for mounting a subsequent new pipe | tube in the laying apparatus of a pipe line. It is a figure which shows the state which has joined the new pipe of the head side, and the subsequent new pipe. It is a figure which shows the case where a new pipe is laid in the existing pipe line currently inclined.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing pipe line 1a Lower end part 2 New pipe 3 Insertion 11 Base part 12 Receptacle 13 Hydraulic jack 16 Anti-slip jig | tool 28 Clearance

Claims (4)

A base part provided in accordance with the inclination of the existing pipe line at a position corresponding to the lower end part in the inclination direction of the existing pipe line inclined and fixed, and a position corresponding to the lower end part, the base part A feeding means for feeding the new pipe placed on the inlet side into the existing pipe line and the receiving pipe of the new pipe, and allowing the new pipe to pass when the new pipe is fed. When the new pipe passes, a gap is formed between the new pipe and the feeding means, and a succeeding new pipe is disposed in the gap, it contacts the receiving port of the passed new pipe. And an anti-slip means for preventing the new pipe that has passed through from sliding down to the lower end side of the existing pipe. The feeding means is a jack that feeds a new pipe into an existing pipe line with a predetermined stroke, and can be applied to the foundation portion so as not to move along the inclination of the foundation portion, and the feeding force from the jack is reduced. The feeding force transmitting means for transmitting to the new pipe, the length in the feeding direction is the same as or shorter than the stroke of the jack, and the base portion is prevented from moving along the inclination of the base portion. A spacer that can be engaged with each other, and one or a plurality of the spacers can be disposed between the feeding force transmission means and the jack, and the jack is operated to operate the new pipe. When one stroke is fed into the existing pipe line, the feeding force transmitting means or the spacer is applied to the base portion, and the jack is in an initial state. The spacer is newly added to the gap formed between the feeding force transmission means or the spacer and the jack in the engaged state, and the jack is operated by eliminating the engaged state. 2. The pipe laying apparatus according to claim 1, wherein the new pipe can be fed into the existing pipe line deeply by the length of the added spacer. 3. A new pipe support portion having an inner surface with a shape corresponding to the outer surface of the new pipe; a gap portion formed in a penetrating state from the outer surface to the inner surface of the new pipe support portion; and the gap portion A slip-off prevention plate inserted into the inner surface, the tip of which can be protruded from the inner surface, and the new tube is prevented from protruding from the inner surface when the new tube is fed. The tip of the slip-off prevention plate protrudes from the inner surface when the new tube passes through the new tube support, and the tip is engaged with the receiving port of the new tube. The conduit laying device according to claim 1 or 2, wherein the conduit laying device is capable of being used. Provided on the lower end side in the inclination direction of the existing pipe line, in contact with the outer surface of the upper part of the new pipe fed into the existing pipe line, when the new pipe is fed, the new pipe is relative to the feeding direction The apparatus for laying a pipe according to any one of claims 1 to 3, further comprising a lifting prevention means for preventing the lifting.

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