JP5036640B2 - Retracting device for underground pipe replacement work - Google Patents

Description

  The present invention relates to a pull-in device used in exchanging underground underground pipes, and in particular, when exchanging existing pipes embedded in the past for use in sewers or the like, the pipes are inserted in advance into the existing pipes to be replaced. The present invention relates to an apparatus for connecting a crushing cutter and a new replacement pipe to the drawn pipe and then drawing the drawing pipe and moving the crushing cutter and the new pipe.

  Generally, the existing sewer pipes are made of concrete or ceramic fume pipes, and there are existing pipes that have reached the time to replace them because they have deteriorated due to long-term use. Yes. In order to replace this with a pipe made of vinyl chloride or the like, it is conceivable to dig up the existing pipe and backfill the new pipe. However, since existing sewer pipes are generally buried along the road, in order to dig up this, start by peeling off the paved surface such as asphalt after blocking the road traffic. In addition to incurring traffic jams, it also resulted in longer and larger construction.

Therefore, in order to solve these problems, a construction method has been proposed in which a new pipe is laid without digging up the existing pipe by expanding the inner diameter while crushing the existing pipe and inserting the new pipe into the inside. (See Patent Document 1). And in order to implement such a construction method, a crushing cutter for crushing an existing pipe and a drive device for moving a new pipe continuous therewith are necessary. Conventionally, a method of propelling from a starting shaft by a hydraulic device called a so-called hydraulic jack, or a method of pulling from a reaching shaft by a traction device has been employed (see Patent Document 1).
Japanese Patent Laid-Open No. 11-6393 (page 2-4, FIGS. 1 and 2) Japanese Patent Laid-Open No. 10-46984 (page 3-4, FIG. 1)

  The above-mentioned apparatus used for the above construction method is configured to be large in size in order to output a large compression / tension drive (see Patent Document 2). This is because the entire apparatus is integrally configured to transmit the driving force in the advancing / retreating direction by an actuator such as a hydraulic cylinder without waste.

  However, as the entire device becomes larger, not only is it necessary to excavate a shaft that can be installed, but additional work is required for connection to both ends where the existing pipe is embedded, that is, to the existing mine (manhole). It was supposed to be. The reason is that the existing manhole has a small opening and cannot be installed in the manhole. Therefore, when using an existing manhole, drill work to expand the opening of the manhole (i.e., so-called hanger suspension work) must be installed in the manhole after sufficiently widening the opening. did not become. In this case, it was necessary to repair the opening of the manhole after the construction.

  On the other hand, when trying to use an existing manhole as it is, it is conceivable to use a retractable device designed to be small, but by reducing the size of the device, the output will be reduced. In the construction method of burying a new pipe while destroying an existing pipe, it was expected that necessary and sufficient output could not be stably obtained and the construction would be difficult.

  The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a large retractor that can use an existing manhole.

  Therefore, the present invention is a retractor for underground underground pipe replacement work comprising two independent sliders and a movable body that can be attached to and detached from the slider, wherein the slider is provided on the frame and the frame. Slide rail, a slide portion provided so as to be capable of moving back and forth along the slide rail, and an actuator for moving the slide portion forward and backward. The moving body includes a clamp frame having clamp means, and both sides of the clamp frame. A slide connecting portion that is detachably attached to the slide portion of the slider, and the two sliders are arranged on both the left and right sides in the retracting direction, the moving body is arranged in the middle, and the slide portion has the above-mentioned When connecting the slide connecting portion of the moving body, the moving body is advanced through the slide portion by the actuator of the slider. It can be then formed by the gist of underground pipe replacement work for drawing device according to claim.

  According to the above configuration, the two independent sliders are configured so that the entire device is integrally formed by connecting the slide portion of the slider to the slide connection portion of the moving body, and thus the connection is released. In this state, the two sliders and the moving body can be transported as independent members. Therefore, when the apparatus is carried in and installed in the existing mine (manhole), the two sliders and the moving body can be individually carried in and easily combined in the existing mine (manhole). In addition, since the slide connecting portion of the moving body is connected to the slide portion which is provided in the slider and which can be moved forward and backward, the moving portion moves forward and backward as long as the slide portion is controlled along the slide rail. Movement in the direction is along the slide rail.

  The present invention also relates to a pull-in device for exchanging underground pipes, comprising two independent sliders, slider coupling means for connecting the sliders, and a movable body that can be attached to and detached from the slider. Comprises a frame, a slide rail provided on the frame, a slide part provided so as to be movable back and forth along the slide rail, and an actuator for moving the slide part forward and backward. A connecting frame having a thickness, a slider coupling portion provided near both ends of the coupling frame and detachable near the tip of the slider, and a pressing member projecting in the vicinity of the slider coupling portion. The body is provided on both sides of the clamp frame with clamp means, and is detachable from the slide part of the slider. When the two sliders are arranged on both the left and right sides in the pull-in direction, the moving body is arranged in the middle, and the slide connecting part of the moving body is connected to the slide part, The moving body can be moved back and forth by the slider actuator by the slider actuator, and when the slider coupling portion of the slider coupling means is mounted near the opposing edge of the slider, the end portions of the two sliders separated to the left and right are coupled. The gist of the present invention is also a retractor for exchanging underground pipes, which is characterized in that it is made to work.

  According to the above configuration, the two sliders, the slider coupling means, and the moving body are configured as independent members, and therefore can be carried into the interior via the opening of the established mine (manhole). And in the established pit, the moving body is arranged in the middle of the two sliders and the slide part and the slide connecting part are connected, so that the entire unit can be almost finished, and the end of the independent slider By joining the parts together by the slider joining means, the parts can be integrated more firmly. Further, since the slider coupling means is provided with a pressing member, the reaction force generated during the pulling operation can be dispersedly supported by bringing the pressing member into contact with the inner wall of the established pit (manhole). .

  The connecting frame of the slider coupling means in the invention can be formed in an arc shape in the longitudinal direction. In this case, when the slider coupling means is mounted on the slider, the bulging side of the coupling frame is directed outward. It is preferable.

  With the above configuration, when the ends of the independent sliders are coupled by the slider coupling means, the coupling frame does not exist within the moving range (substantial working space) of the moving body, and the working space is widely utilized. can do. That is, since the connection frame is formed in an arc shape that matches the curvature of the inner wall of the established mine (manhole), the connection frame is arranged along the inner wall surface of the established mine (manhole). It does not hinder the body's advance or retreat or the withdrawal of the retractable tube.

  Further, the slider coupling means in the above invention can be divided into two so as to couple both ends of the slider. According to such a configuration, the slider having the long slide rail is fixed at both ends in the sliding direction (advancing / retreating direction), and can be installed in a state where the opposing slider is stable. Then, the pressing members provided at both ends of each connecting frame of the slider coupling means divided at both ends are brought into contact with the inner wall surface of the already established mine (manhole), so that the retraction of the sliding direction (advancing / retreating direction) can be prevented. Can absorb power.

  Further, the clamping means in each of the above inventions is arranged on the surface of the clamp frame with the semicircular cutout portions facing each other, and a clamping portion that slides on the surface of the clamp frame is continuous with and identical to the clamping portion. It can be set as the structure provided with the link member by which an intermediate position is pivotally supported by the axis | shaft, and the 2nd actuator which advances and retracts the front-end | tip of this link member.

  According to the said structure, the clamp means itself can be comprised thinly and the clamp frame itself of a moving body can be reduced in size. That is, by operating the second actuator, it is possible to clamp the drawing tube to be clamped from both sides, and it is possible to configure the member by arranging the members on the surface of the clamp frame.

  According to the present invention, since the slider and the moving body can be separated and loaded, the apparatus can be loaded into an existing manhole. In addition, by connecting the slider and the moving body within the manhole, a large drawing device can be configured, and the drawing drive necessary and sufficient for underground pipe replacement work can be obtained.

  Moreover, according to the invention provided with the slider coupling means, the leading ends of the sliders carried into the manhole can be coupled to each other, and the slider that should be the basis for the advance and retreat of the moving body can be stably integrated. . Further, by bringing the pressing member of the slider coupling means into contact with the inner wall surface of the manhole, the position of the entire apparatus in the manhole is fixed, and the reaction force of the pulling drive during the pulling operation can be dispersed on the inner wall of the manhole. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the present embodiment includes two independent sliders 1 and 2 provided in a symmetrical shape and a moving body 3 provided independently of the sliders 1 and 2. The movable body 3 is arranged in the middle of the sliders 1 and 2 arranged at appropriate intervals, and the left and right sides of the movable body 3 are connected to the sliders 1 and 2 to constitute an integral drawing device. .

  The sliders 1 and 2 include relatively long and thin frames 10 and 20 whose plane shape is substantially I-shaped. The frames 10 and 20 include hydraulic cylinders (actuators) 11 that extend and contract in the longitudinal direction. 21 is mounted, and slide parts 12 and 22 are connected to advance / retreat rods of the hydraulic cylinders (actuators) 11 and 21 so that the slide parts 12 and 22 can be advanced and retracted. In addition, slide rails 13 and 23 having sliding surfaces along the longitudinal direction are formed at the constricted portions of the frames 10 and 20, and the slide portions 12 and 22 can be mounted. Accordingly, the slide portions 12 and 22 can be moved back and forth along the slide rails 13 and 23 by the driving force in the forward / backward direction by the hydraulic cylinders (actuators) 11 and 21. In the vicinity of the front and rear ends of the sliders 1 and 2, widened portions are formed on both sides of the constricted portion, and adjuster bolts 14, 15, 24, and 25 are provided in the vicinity of the front and rear ends so that they can stand on their own.

  The movable body 3 is provided with a clamp frame 31 at the center, and the clamp frame 31 is provided with clamp means 30 so that the underground pipe can be gripped when the underground pipe is pulled. . On the left and right sides of the clamp frame 31, slide connecting portions 4 and 5 are provided. The slide connecting portions 4 and 5 are composed of parallel wall surface portions 41 and 51 and projecting portions 42 and 52 projecting outward on the left and right sides at the upper end edges of the wall surface portions 41 and 51. By connecting 5 to the slide portions 12 and 22 of the sliders 1 and 2, as described above, when the slide portions 12 and 22 are advanced and retracted, the moving body 3 can be advanced and retracted accordingly. In addition, the above-described connection unites the parts 1, 2, and 3.

  A connection structure between the sliders 1 and 2 and the moving body 3 will be described. The sliding portions 12 and 22 of the sliders 1 and 2 are provided with locking portions 16 and 26 projecting in an appropriate range in the vertical direction on the opposing surface, and female screw portions 17, 18, 27, and 28 formed on both sides thereof. Is provided. On the other hand, the slide connecting portions 4 and 5 of the movable body 3 are provided through the locking grooves 43 and 53 and the overhang portions 42 and 52 configured in the vertical direction at appropriate portions of the wall surface portions 41 and 51. Female screw portions 44, 45, 54, and 55 are provided. Therefore, the engaging portions 16 and 26 of the sliders 1 and 2 are engaged with the engaging grooves 43 and 53 of the moving body 3, whereby the moving body 3 is positioned. The female screw parts 17, 18, 27, 28, 44, 45, 54, 55 can be connected together by screwing high tension bolts 61, 62, 63, 64 into positions facing each other. The driving force related to the advancement and retraction of the slide parts 12 and 22 is transmitted to the slide connecting parts 4 and 5 by the high tension bolts 61, 62, 63 and 64, and the locking parts 16 and 26 and the locking groove 43. , 53 is applied to the appropriate range of the wall surface portions 41, 51 of the slide connecting portions 4, 5, and the driving force is evenly transmitted to the entire moving body 3.

  Next, details of the slide portions 12 and 22 constituting the sliders 1 and 2 will be described. As described above, the slide portions 12 and 22 are mounted on the slide rails 13 and 23, but the slide portions 12 and 22 are mounted in such a manner as to wrap around the slide rails 13 and 23. That is, as shown in FIG. 2A, the slide portions 12 and 22 are configured to have a substantially C-shaped cross section, so that the opening portion faces upward and the peripheral portions 12a and 12a, The inner surfaces of 12b, 22a, 22b are mounted so as to be in sliding contact with the upper sliding surfaces of the slide rails 13, 23.

  Accordingly, the positions of the inner surfaces of the slider portions 12 and 22 are in contact with the surfaces of the slide rails 13 and 23, and the positions of the peripheral portions 12a, 12b, 22a, and 22b of the opening portion of the slide rails 13 and 23 are restricted. The downward weight is supported while being in sliding contact with the sliding surface.

  Of the peripheral portions 12a, 12b, 22a and 22b of the opening portions constituting the slide portions 12 and 22, the opening peripheral portions 12b and 22b located on the side facing the sliders 1 and 2 carry the moving body 3. Planar portions 12c and 22c are provided for placement. The flat portions 12c and 22c are provided with female screw portions 17, 18, 27 and 28 for connection to the moving body 3 (see FIG. 1), and are connected by high tension bolts 61 to 64. The overhang portions 42 and 52 of the moving body 3 are placed. In order to place the moving body 3, in addition to the flat portions 12 c and 22 c, overhanging contact portions 19 and 29 are configured as shown in FIG. 1. The overhanging contact portions 19 and 29 are provided with appropriate lengths in the sliding direction at locations away from the positions where the slide portions 12 and 22 advance and retreat, and the overhanging portions 42 and 52 of the moving body 3. Can be supported together with the slide portions 12 and 22.

  Next, the detail of the clamp means 30 with which the moving body 3 is provided is demonstrated. As described above, since the moving body 3 is connected to the slide parts 12 and 22 and can be advanced and retracted by operating the hydraulic cylinders (actuators) 11 and 21, the clamp means 30 of the moving body 3 grips the tube to be drawn. By holding, when the moving body 3 advances and retreats, the gripped tube can be drawn. Therefore, there is sufficient gripping force to hold the leading pipe that is inserted into the existing pipe (concrete pipe) that is buried in the ground and that is equipped with a crushing device at the rear end. Necessary.

  Therefore, in the present embodiment, as shown in FIG. 2B, a pantograph-like link mechanism is used, and the hydraulic cylinder 33 is arranged so as to move up and down with respect to the upper link pin 32 of the link mechanism. . The angle of the lower link frames 35 and 36 is changed by keeping the position of the lower link pin 34 constant. The lower link frames 35 and 36 are connected to the gripping pieces 37 and 38 on the opposite side via the lower link pin 34, and when the angle of the right link frame 35 in the drawing changes, When the angle of the gripping piece 37 changes and the angle of the left link frame 36 in the figure changes, the angle of the right holding piece 38 in the figure changes. And the semicircular notch part is comprised in the opposing edge of both the holding pieces 37 and 38, and when the said opposing edge closely_contact | adheres, a circular through-hole will be formed in the center. The change angle of the gripping pieces 37 and 38 is restricted by the restriction holes 39 and 39 formed in the clamp frame 31, and the gripping pieces 37 and 38 are moved along the restriction holes 39 and 39. When expanding, the center through-hole is divided into left and right to release the gripping state.

  Next, a method for exchanging underground pipes according to this embodiment will be described. As shown in FIG. 3, the outline of the underground pipe replacement work is as follows. The leading pipe PP is inserted into the existing pipe OP embedded between the existing pits (manholes) VH1 and VH2 (FIG. 3A). ), In the established pit VH1 on the start side that functions as the start shaft, the crushing device CM and the new pipe NP are connected to the end of the previous pipe PP (FIG. 3B), and the established mine VH2 on the start side that functions as the reaching shaft In Fig. 3 (c), the front end of the leading pipe PP is pulled. Every time one leading pipe PP is pulled in, the leading pipe PP is removed from the existing pit VH2 on the reaching side, and the new pipe NP to be buried is added to the reaching pit in the existing pit VH1 on the reaching side. The exchanging of the buried pipe is completed by moving to the already established mine VH2 (FIGS. 3D and 3E).

  During the above process, the insertion of the leading conduit into the existing pipe does not require an obstacle because it does not have an obstacle, and it can be inserted manually, but there is no residue in the existing pipe. In the case where it exists, as shown in FIG. 3A, it is also possible to press-fit by using the drawing device of the present embodiment. Further, the crushing device in the figure is composed of a crushing cutter unit CM1 and an operation unit CM2, and is configured to be separately disassembled, and has a length corresponding to two of the newly installed pipes NP. Therefore, all of the above steps are completed by drawing them into the already established mine VH2 and carrying them out from the already established mine VH2.

  Here, a procedure for installing the retracting device of the present embodiment in the already established mine VH2 will be described. Since the general established mine VH2 has a smaller opening diameter than the internal diameter, the integrated retractor cannot be directly carried into the established mine VH2. Therefore, in the state where the sliders 1 and 2 and the moving body 3 of the present embodiment are separated, they are individually carried into the already established mine VH2 and are merged inside the already established mine VH2, so that the retracting device is eventually installed. It can be carried into VH2.

  More specifically, as shown in FIG. 4, the sliders 1 and 2 are loaded one by one, and after both are loaded, they are temporarily installed at predetermined intervals (FIGS. 4A and 4B). At this time, the longitudinal direction of the frames 10 and 20 is parallel to the drawing direction of the leading conduit PP, and the opening of the existing pipe OP in which the leading conduit PP has already been inserted on the side where the clamp frame 31 of the moving body 3 is to be installed. Place on the side. Next, the moving body 3 is carried in and disposed in the middle of the sliders 1 and 2 already installed (FIG. 4C). At this time, the orientation is adjusted so that the clamp frame 31 is on a predetermined side, and the overhanging portions 42 and 52 are placed on the slide portions 12 and 22 and the overhanging contact portions 19 and 29, and high tension is applied. Bolts 61 to 64 are screwed to connect the slide portions 12 and 22 and the overhang portions 42 and 52. As described above, the operation of pulling the leading conduit is started by the pulling device united inside the established mine VH2.

  In the pulling method, the leading pipe PP is gripped by the gripping pieces 37 and 38 of the clamping means 30, and the movable body 3 is moved in the pulling direction. A small diameter portion is formed at an appropriate interval on the surface of the leading pipe PP, and the gripping pieces 37 and 38 are engaged with the small diameter portion, thereby enabling reliable gripping and a pulling driving force. It can be reliably transmitted to the leading conduit PP. The moving body 3 is moved through the slide portions 12 and 22 by operating the hydraulic cylinders (actuators) 11 and 21. When the movable body 3 moves to a predetermined position (by the stroke length of the hydraulic cylinder), the gripping of the leading conduit PP by the clamping means 30 is released, and the movable body 3 is retracted to the original position. Although depending on the effective stroke length of the hydraulic cylinders (actuators) 11 and 21, by moving the moving body 3 back and forth several times (2 to 3 times), the leading conduit PP can be drawn in by a distance corresponding to this, By corresponding to the length of one leading conduit PP, the drawing of one leading conduit PP is completed. Thereafter, the leading conduit PP is separated from the succeeding leading conduit PP and removed. By resuming the advance and retreat of the moving body 3 after this separation, the next-order leading pipe PP can be drawn. This is repeated, and the exchange of the underground pipe is completed when the drawing is completed over the entire range.

  According to this embodiment, since the established pit (manhole) can be used as the arrival side vertical shaft VH2, it is not necessary to excavate the vertical shaft for installing the retracting device. Further, the sliders 1 and 2 and the moving body 3 are connected by screwing high tension bolts 61 to 64, and since it is very simple, even in the existing pipe VH2 where a sufficient space cannot be secured. , And can be easily connected in a short time.

  Next, a second embodiment of the present invention will be described. In the present embodiment, a slider coupling means is added to the sliders 1 and 2 and the moving body 3. As shown in FIG. 5, the slider coupling means is composed of two types of slider coupling means 7 on the front side and slider coupling means 8 on the rear side. The rear slider coupling means 8 is installed in the rearward direction, and is installed in the rearward direction. Since the two are slightly similar in size, the front side coupling means 7 will be described as an example. This coupling means 7 is provided in the vicinity of both ends of the coupling frame 71 that is curved in an arc shape. Slider coupling portions 72 and 73 are provided, and pressing members 74 and 75 supported in the vicinity of the slider coupling portions 72 and 73 are projected.

  The connection frame 71 is configured by a plate-like member having an arcuate bulge side facing outward, and a plurality of ribs 76 and 77 are provided on the outer surface thereof to supplement the strength of the frame 71. The slider coupling portions 72 and 73 have a plane perpendicular to the plate-like surface of the connection frame 71 and can come into contact with the upper surfaces of the sliders 1 and 2. The pressing members 74 and 75 are configured by adjuster bolts, and pass through the support bases 78 and 79 disposed between the both ends of the connection frame 71 and the slider coupling portions 72 and 73, thereby the support bases 78 and 75. 79 is supported. Female screws are threaded into through holes (not shown) of the support bases 78 and 79, and the protruding length can be adjusted by screwing of the adjuster bolt.

  The slider coupling portions 72 and 73 of the coupling means 7 are provided with long holes, and bolts B1 to B4 penetrating therethrough are screwed into screw holes 91 to 94 provided on the upper surfaces of the sliders 1 and 2, respectively. It can be fixed by combining. Thus, by mounting the coupling means (front side) 7 near the front end of the sliders 1 and 2, the two independent sliders 1 and 2 can be coupled on the front side. Similarly, the sliders 1 and 2 can be coupled on the rear side by fixing the rear-side slider coupling means 8 to the rear side of the slide parts 1 and 2.

  As described above, by combining the sliders 1 and 2 on the front side and the rear side, the sliders 1 and 2 and the slider coupling means 7 and 8 can be integrated into a substantially quadrilateral shape as a whole. And the moving body 3 arrange | positioned in the middle of both the sliders 1 and 2 will be arrange | positioned so that it can advance / retreat inside the said quadrilateral shape, and the movement area | region of the said moving body 3 can be ensured. Further, as described above, the pressing members 74 and 75 are composed of adjuster bolts, and by adjusting the protruding length thereof, the tip portions thereof are brought into contact with the inner wall surface of the established mine (manhole), and Since it becomes possible to press the wall surface, the entire device including the sliders 1 and 2 is brought into contact with the wall surface by bringing the tip portions of the pressing members 74, 75, 84 and 85 into contact with the wall surface on both the front side and the rear side. Positioning can be performed.

  The connecting frames 71 and 81 of the slider coupling means 7 and 8 may be configured in a straight line, but in this case, the connecting frames 71 and 81 straddle the sliders 1 and 2 and both sliders. The space in the middle of 1 and 2 can be blocked. Therefore, the space between the sliders 1 and 2 can be effectively used by configuring the connecting frames 71 and 81 in an arc shape that bulges outward.

  When the present embodiment having the above-described configuration is installed in the already established mine (manhole) VH2, the slider connecting means 7 on the front side is carried into the already established mine VH2 after the installation of the sliders 1 and 2 shown in FIG. Thus, the front sides of the sliders 1 and 2 are coupled. Further, after the moving body 3 shown in FIG. 4C is installed, the rear-side slider coupling means 8 is carried in, thereby coupling the rear sides of the sliders 1 and 2. Finally, by adjusting the pressing members 74, 75, 84, 85 of the slider coupling means 7 and 8 on the front side and the rear side to press the wall surface of the already established mine VH2, the entire retraction device is connected to the established mine VH2. It will be stably installed at a predetermined position.

  The embodiment of the present invention is as described above, but various modes can be taken without departing from the spirit of the present invention. For example, the driving force of the link member in the clamp means 30 is configured by the hydraulic cylinder 33. This is because the hydraulic cylinders 11 and 12 are used for moving in the forward and backward directions of the slide portions 12 and 22, and therefore the same hydraulic pressure is used. The unit may be configured to be clamped by using hydraulic pressure, and may be configured to be clamped by a driving force in place of the hydraulic cylinder 33.

It is explanatory drawing which shows 1st embodiment of this invention. (A) is IIA-IIA sectional drawing, (b) is IIB-IIB sectional drawing. It is explanatory drawing which shows the outline of the construction method in which this invention is used. It is explanatory drawing which shows a use aspect. It is explanatory drawing which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Slider 3 Moving body 4, 5 Slide connection part 7, 8 Slider coupling means 10, 20 Frame 11, 21 Hydraulic cylinder (actuator)
12, 22 Slide part 13, 23 Slide rail 16, 26 Locking part 19, 29 Overhang contact part 30 Clamp means 31 Clamp frame 42, 52 Overhang part 71, 81 Connection frame 72, 73 Slider coupling part 74, 75 , 84, 85 Press member 91, 92, 93, 94 Screw hole B1, B2, B3, B4 Bolt CM Crushing device NP New pipe OP Existing pipe PP Pre-conduit VH1 Established mine on the start side (manhole)
VH2 Reached mine (manhole)

Claims (5)

A retraction device for underground pipe replacement work comprising two independent sliders and a movable body detachable from the slider,
The slider includes a frame, a slide rail provided on the frame, a slide portion provided to be movable back and forth along the slide rail, and an actuator for moving the slide portion forward and backward.
The movable body includes a clamp frame having clamp means, and slide connecting portions that are provided on both sides of the clamp frame and are detachable from the slide portion of the slider,
The two sliders are arranged on both the left and right sides in the pull-in direction, and the movable body is arranged between the two sliders. When the slide connecting portion of the movable body is connected to the slide portion, the slider actuator causes the slide portion to pass through the slide portion. A retracting device for exchanging underground pipes, wherein the moving body can be moved forward and backward. A retractable device for exchanging underground pipes, comprising two independent sliders, slider coupling means for connecting the sliders, and a movable body detachable from the slider,
The slider includes a frame, a slide rail provided on the frame, a slide portion provided to be movable back and forth along the slide rail, and an actuator for moving the slide portion forward and backward.
The slider coupling means is provided with a coupling frame having an appropriate length, a slider coupling section provided near both ends of the coupling frame, a removable coupling section near the tip of the slider, and a projecting section near the slider coupling section. A pressing member,
The movable body includes a clamp frame having clamp means, and slide connecting portions that are provided on both sides of the clamp frame and are detachable from the slide portion of the slider,
The two sliders are arranged on both the left and right sides in the pull-in direction, and the movable body is arranged between the two sliders. When the slide connecting portion of the movable body is connected to the slide portion, the slider actuator causes the slide portion to pass through the slide portion. The movable body can be moved forward and backward, and when the slider coupling portion of the slider coupling means is mounted in the vicinity of the opposing end edge of the slider, the ends of the two sliders separated to the left and right are coupled. Pull-in device for underground pipe replacement work. The connection frame of the slider coupling means is a connection frame formed in an arc shape in the longitudinal direction, and when the slider coupling means is attached to the slider, the bulging side of the connection frame is directed outward. Item 2. The pull-in device for underground pipe replacement work according to item 2. 4. The underground buried pipe exchanging retractor according to claim 2, wherein the slider coupling means is a slider coupling means divided into two so as to couple both ends of the slider. The clamp means of the clamp frame is arranged on the surface of the clamp frame with the semicircular cutouts facing each other, and a clamping part that slides on the surface of the clamp frame, is continuous with the clamping part, and is on the same axis. The underground pipe replacement work according to any one of claims 1 to 4, which is a clamp means comprising a link member pivotally supported at an intermediate position and a second actuator for advancing and retreating the tip of the link member. Retraction device.

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