JP6309290B2 - Pipe propulsion device - Google Patents

Description

  The present invention relates to a pipe propulsion device.

  Conventionally, when laying cables such as power cables and communication cables in the ground, the ground is cut to a predetermined depth to form a groove, and the block main body is arranged in the groove, followed by the block main body. After the cable is extended inside, an opening method is used in which the lid member is placed on the block body and the ground is refilled.

  However, in the excavation method, it is necessary to excavate the ground and then backfill, so that not only the work time, that is, the construction period, becomes longer, but also when the cable is laid in the ground along the road, the work is performed. While on the road, traffic on the road will be hindered.

  Therefore, a propulsion method has been provided in which a plurality of propulsion pipes are pushed into the ground and propelled by a main pushing device without excavating the ground, thereby laying cables in the ground.

  In the propulsion method, a plurality of propulsion pipes are sequentially connected to the rear of the leading propulsion pipe via a joint, and each of the propulsion pipes is pushed into the ground and propelled along a route in which a cable is laid. .

  For this purpose, a start shaft is formed on one end side of the path where the cable is laid, a reaching shaft is formed on the other end side, and the main pushing device is disposed in the start shaft.

  2 is a first diagram showing an example of a conventional pipe propulsion device, FIG. 3 is a diagram showing an insertion joint for connecting the propulsion pipes, and FIG. 4 is a second diagram showing an example of a conventional pipe propulsion device. 5 is a view showing a pin joint for connecting a propulsion pipe, and FIG. 6 is a view for explaining a conventional propulsion method.

  In the figure, 11 is a pipe propulsion device, 12 is a propulsion pipe row that is pushed into the ground and propelled, hi (i = 1, 2,...) Is a plurality of propulsion pipes, and the respective propulsion pipes hi are sequentially connected. Thus, the propelling tube row 12 is configured. The leading propulsion pipe h1 among the propulsion pipes hi functions as an excavation propulsion pipe (leading conductor) that pushes away underground soil. Further, ji (i = 1, 2,...) Is an insertion joint for connecting the respective propulsion pipes hi with end faces, and ki (i = 1, 2,...) Is rocked between the propulsion pipes hi with a pin p1. It is a pin joint that connects freely.

  Reference numeral 14 denotes a start shaft, 15 denotes a main pushing device disposed in the start shaft 14, and 17 denotes a guide device for guiding each propulsion pipe hi. The main pushing device 15 includes a hydraulic device (not shown), advances the jack by the hydraulic device, pushes the rear propulsion tube among the propulsion tubes hi, and moves the propulsion tube row 12 forward.

  The guide device 17 includes a pair of guides gd1 and gd2 disposed on the left and right sides of a predetermined propulsion pipe in front of the main pushing device 15, and the guides gd1 and gd2 are arranged at the lower part of the predetermined propulsion tube. It supports on both sides and guides each propulsion pipe hi.

  When the propulsion tube row 12 reaches the reaching shaft, the leading propulsion tube h1 is collected, and a cable is laid in the propulsion tube row that is a hollow body.

  In addition, when the path | route in which a cable is laid is curved, as shown in FIG. 6, each propulsion pipe hi is connected by the pin joint ki, and the propulsion pipe row | line | column 12 is curved along a path | route, and is propelled. (For example, refer to Patent Document 1).

JP 2013-217194 A

  However, in the above-described conventional propulsion method, when the propulsion pipe row 12 in which each propulsion pipe hi is connected by the pin joint ki is pushed into the ground for propulsion, as shown in FIG. The propulsion pipe hi connected to the device 17 by the pin joint ki may swing left and right (arrow direction).

  In that case, it becomes impossible to push the propelling tube row 12 straight into the ground, and as a result, it becomes impossible to propel the propelling tube row 12 stably in the ground.

  The present invention provides a tube propulsion device that solves the problems of the conventional propulsion method and that can push the propelling tube row straight into the ground and can be stably propelled in the ground. For the purpose.

  In the pipe propulsion apparatus according to the present invention, a propulsion pipe row composed of a plurality of propulsion pipes is pushed into the ground to be propelled.

  And, by placing a pedestal extending in the propulsion direction of the propulsion pipe row in the start shaft, and being arranged at the rear end of the pedestal, by pushing the rear propulsion pipe among the plural propulsion pipes The main pushing device for moving each propulsion pipe forward, and a guide device disposed in front of the main pushing device and supporting the propulsion pipe on the gantry.

In addition, the guide device includes a plurality of guide carriages that can be moved forward in a state where the propulsion pipes are clamped at one or more places and supported as the propulsion pipes on the gantry are moved forward. .
The gantry includes first and second traveling tracks formed on the left and right sides in the width direction for causing the guide carriages to travel in accordance with the movement of the propelling pipe row.
Each of the guide carriages is provided with a first roller rotatably disposed around an axis extending in the width direction of the gantry and a second roller rotatably disposed around an axis extending in the vertical direction of the gantry. The first roller is rotated while being in contact with the first contact surfaces of the first and second traveling tracks, and the second roller is rotated in the second direction of the first and second traveling tracks. By rotating while abutting against the abutting surface, it is moved forward, and the propelling tube row is propelled.

  According to the present invention, in the pipe propulsion device, a propulsion pipe row composed of a plurality of propulsion pipes is pushed into the ground and propelled.

  And, by placing a pedestal extending in the propulsion direction of the propulsion pipe row in the start shaft, and being arranged at the rear end of the pedestal, by pushing the rear propulsion pipe among the plural propulsion pipes The main pushing device for moving each propulsion pipe forward, and a guide device disposed in front of the main pushing device and supporting the propulsion pipe on the gantry.

In addition, the guide device includes a plurality of guide carriages that can be moved forward in a state where the propulsion pipes are clamped at one or more places and supported as the propulsion pipes on the gantry are moved forward. .
The gantry includes first and second traveling tracks formed on the left and right sides in the width direction for causing the guide carriages to travel in accordance with the movement of the propelling pipe row.
Each of the guide carriages is provided with a first roller rotatably disposed around an axis extending in the width direction of the gantry and a second roller rotatably disposed around an axis extending in the vertical direction of the gantry. The first roller is rotated while being in contact with the first contact surfaces of the first and second traveling tracks, and the second roller is rotated in the second direction of the first and second traveling tracks. By rotating while abutting against the abutting surface, it is moved forward, and the propelling tube row is propelled.

  In this case, as each propulsion pipe on the gantry is moved forward, the plurality of guide carriages can move forward while holding the propulsion pipe at one or more locations and supporting it. It will not swing from side to side. Therefore, the propulsion pipe row can be pushed straight into the ground and can be propelled stably in the ground.

It is a front view of the guide trolley | bogie in embodiment of this invention. It is a 1st figure which shows the example of the conventional pipe | tube propulsion apparatus. It is a figure which shows the insertion joint which connects a propulsion pipe. It is a 2nd figure which shows the example of the conventional pipe | tube propulsion apparatus. It is a figure which shows the pin joint which connects a propulsion pipe. It is a figure for demonstrating the conventional propulsion construction method. It is a side view of the pipe | tube propulsion apparatus in embodiment of this invention. It is a top view of a pipe propulsion device in an embodiment of the invention. It is a front view of a pipe propulsion device in an embodiment of the invention. It is a top view of the guide trolley | bogie in embodiment of this invention. It is a left view of the guide trolley | bogie in embodiment of this invention. It is a perspective view which shows the principal part of the guide trolley | bogie in embodiment of this invention. It is the 1st figure for explaining the laying method of the cable in an embodiment of the invention. It is the 2nd figure for demonstrating the laying method of the cable in embodiment of this invention. It is a 3rd figure for demonstrating the laying method of the cable in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  7 is a side view of the tube propulsion device according to the embodiment of the present invention, FIG. 8 is a plan view of the tube propulsion device according to the embodiment of the present invention, and FIG. 9 is a front view of the tube propulsion device according to the embodiment of the present invention. It is.

  In the figure, 12 is a propulsion pipe row that is pushed into the ground and propelled, hi (i = 1, 2,...) Is a plurality of propulsion pipes, and the propulsion pipes are connected by sequentially connecting the propulsion pipes hi. Column 12 is configured. The leading propulsion pipe h1 among the propulsion pipes hi functions as an excavation propulsion pipe (leading conductor) that pushes away underground soil.

  Further, ki (i = 1, 2,...) Is a pin joint that connects the respective propulsion pipes hi with pins p1.

  Reference numeral 31 denotes a pipe propulsion device, and the pipe propulsion device 31 is a gantry that extends in the longitudinal direction of the propulsion pipe row 12, that is, the propulsion direction in the start shaft 14 as a first shaft. 33, a rear end (right end in FIGS. 7 and 8) in the start shaft 14, that is, a main pushing device 35 disposed at the rear end of the mount 33, and a front push device 35 in the start vertical shaft 14 In the present embodiment, a plurality of guide carriages 36 are provided, each of which is arranged so as to be movable in the front-rear direction with respect to the gantry 33. Each guide carriage 36 constitutes a guide device.

  The gantry 33 has a predetermined width on the left and right sides in the width direction and extends along the propulsion direction of the propulsion pipe row 12 in order to cause the guide carriages 36 to travel as the propulsion pipe row 12 moves. The first and second traveling tracks Lg and Rg are formed in a strip shape, and a groove 38 having a predetermined depth is formed between the first and second traveling tracks Lg and Rg. The guide carriage 36 is installed between the first and second traveling tracks Lg and Rg.

  The main pushing device 35 includes a hydraulic device 43. The hydraulic device 43 moves a jack (not shown) forward, and pushes the rear propulsion tube forward among the propulsion tubes hi, thereby moving the propulsion tube row 12 forward. Move.

  When the rear propulsion pipe of each propulsion pipe hi is pushed forward, the jack is retracted, and a space is formed between the rear propulsion pipe and the jack. Then, the operator places a new propulsion pipe in the space, connects the rear propulsion pipe and the new propulsion pipe by a pin joint, and the main pushing device 35 advances the jack, and again each propulsion pipe hi. Push the rear propulsion tube forward. In this way, by connecting a new propulsion pipe to the rear end of the propulsion pipe row 12, the propulsion tube row 12 can be gradually lengthened, pushed into the ground, and propelled.

  Further, while the main pushing device 35 pushes the propulsion tube row 12 into the ground and propels it, each guide carriage 36 moves a predetermined propulsion tube, in this embodiment, the propulsion tube on the gantry 33 forward. Accordingly, the propulsion pipe is supported and traveled along the first and second travel tracks Lg and Rg and moved forward. Then, when the guide carriage 36 reaches the front end of the gantry 33 in the start shaft 14, the guide trolley 36 is removed from the gantry 33 and retracted to a predetermined location in the start shaft 14. The retracted guide carriage 36 is collected by an operator, transported to the rear end of the starting shaft 14, and placed on a pedestal 33 in a space formed between the rear propulsion pipe and the jack. Therefore, the new propulsion pipe is set on the guide carriage 36 placed on the gantry 33 and supported by the guide carriage 36.

  By the way, when the propulsion pipe row 12 is moved forward by the main pushing device 35, if the propulsion pipe connected by the pin joint ki swings left and right, the propulsion pipe row 12 cannot be pushed straight into the ground. The propulsion pipe row 12 cannot be stably propelled in the ground.

  Therefore, in the present embodiment, among the propulsion pipes hi arranged on the gantry 33, the propulsion pipe whose front end or rear end is connected to another propulsion pipe by the pin joint ki is connected to at least one longitudinal direction. Among the propulsion pipes hi that are supported by the guide carriage 36 and are arranged on the gantry 33, the propulsion pipes whose front ends and rear ends are connected to other propulsion pipes by pin joints ki are arranged at a plurality of positions in the longitudinal direction. Thus, it is supported by the guide carriage 36.

  That is, in this embodiment, as shown in FIG. 7, when the propulsion pipes h1 to h3 are arranged on the mount 33, the rear end of the propulsion pipe h1 is connected to the propulsion pipe h2 and the pin joint k1. Therefore, the propulsion pipe h2 is supported at one place in the longitudinal direction, and the propulsion pipe h2 is connected at the front end by the propulsion pipe h1 and the pin joint k1, and at the rear end by the propulsion pipe h3 and the pin joint k2. Since the front end of the propulsion pipe h3 is connected to the propulsion pipe h2 and the pin joint k2, the propulsion pipe h3 is supported by the guide carriage 36 at one place in the longitudinal direction.

  In this case, since the propulsion pipe h2 is supported by the two guide carriages 36 in the area AR1 between the pin joints k1 and k2, the propulsion pipes h1 to h3 connected by the pin joints k1 and k2 may swing left and right. Absent. Therefore, even if the propulsion pipe h1 in front of the pin joint k1 and the propulsion pipe h3 in the rear of the pin joint k2 are each supported by one guide carriage 36, the propulsion pipes h1 to h3 can be stably supported. .

  As a result, the propulsion tube row 12 can be pushed straight into the ground in a straight traveling state, and can be propelled stably in the ground.

  In the pipe propulsion device 31 shown in FIG. 7, the propulsion pipe h1 is supported by the guide carriage 36 at one place in the longitudinal direction, and the propulsion pipe h2 is supported by the guide carriage 36 at two places in the longitudinal direction. Although h3 is supported by the guide carriage 36 at one place in the longitudinal direction, the propulsion pipes h1 to h3 can be supported at two or more places in the longitudinal direction according to the number of guide carriages 36. .

  Next, each guide carriage 36 will be described.

  1 is a front view of a guide carriage according to an embodiment of the present invention, FIG. 10 is a plan view of the guide carriage according to the embodiment of the present invention, and FIG. 11 is a left side view of the guide carriage according to the embodiment of the present invention. 12 is a perspective view showing a main part of the guide carriage in the embodiment of the present invention. 1, 10 and 12 show a state in which the guide carriage 36 is placed on the gantry 33. FIG.

  In the figure, 12 is a propelling pipe row, 14 is a starting shaft, 33 is a gantry, Lg is a first traveling track, Rg is a second traveling track, 36 is a guide carriage, 38 is a first and second traveling track Lg. , Rg.

  The guide carriage 36 rises upward at a predetermined interval on the main body 51 extending between the first and second traveling tracks Lg and Rg and the top surface 51a of the main body 51. A pair of sandwiching portions 52 as propulsion tube support portions that sandwich and support the respective propulsion tubes Li of the propulsion tube row 12 from the left and right, stays 53 as reinforcement portions that reinforce the respective sandwiching portions 52, and the main body At both ends of the portion 51, a handle 54 formed by projecting from the end face in the width direction of the main pushing device 35, disposed at both ends of the main body 51, the guide carriage 36 is connected to the first and second traveling tracks Lg, A pair of traveling roller units 60 each having traveling rollers 66 and 66 ′ as first rollers for traveling along Rg, and disposed inside the traveling roller unit 60 at both ends of the main body 51. Positioning the guide carriage 36 with respect to the first and second traveling tracks Lg and Rg and positioning the guide carriage 36 as a second roller for manual movement as a second roller for traveling in a straightly traveling state A pair of carriage positioning units 70 each provided with rollers 77 and 77 ′ are provided. The carriage positioning unit 70 makes an adjustment to make the propulsion axis of the main pushing device 15 coincide with the axis in the propulsion direction of the propulsion pipe.

  Each traveling roller unit 60 includes a first roller unit 61 disposed on the front side of the main body 51 and a second roller unit 62 disposed on the rear side of the main body 51.

  The first roller unit 61 has a triangular shape, and a pair of brackets 65 as front roller support portions formed to protrude forward from the front surface 51b of the main body 51, and the bracket 65 A traveling roller 66 is provided as a front first roller that is sandwiched between the brackets 65 and rotatably disposed about an axis extending in the width direction of the gantry 33. Further, the second roller unit 62 has a triangular shape, and a pair of brackets 65 ′ as a rear roller support portion formed to protrude rearward from the back surface 51c of the main body 51, and A travel roller 66 ′ is provided as a rear first roller that is sandwiched between the brackets 65 ′ and rotatably disposed about an axis extending in the width direction of the gantry 33.

  The traveling rollers 66 and 66 ′ of the first and second roller units 61 and 62 are disposed at a predetermined distance from each other in the traveling direction of the guide carriage 36. Further, the lower end of the outer peripheral surface of each of the running rollers 66 and 66 ′ is protruded slightly downward from the main body 51, and when the guide carriage 36 is placed on the mount 33, the first and second running rollers are provided. It is made to contact | abut with the upper surface Su as a 1st contact surface of the track | orbits Lg and Rg.

  Each carriage positioning unit 70 includes a first positioning unit 71 disposed on the front side of the main body 51 and a second positioning unit 72 disposed on the rear side of the main body 51.

  The first positioning unit 71 includes a slider 75 as a front position changing member disposed so as to be movable in the width direction of the gantry 33 with respect to the front surface 51b of the main body 51, and directed forward from the slider 75. And a holding member 76 as a front roller support member formed so as to protrude, and is supported by the holding member 76 so as to be rotatable about an axis extending in the vertical direction, and the outer peripheral surface thereof is the first and second traveling tracks Lg. , A positioning roller 77 as a second roller in front that is brought into contact with the side surface Sw as a second contact surface inside Rg, and a fixing portion for fixing the slider 75 to the main body 51 at a predetermined position. 78, by moving the slider 75 in the width direction of the gantry 33, the guide carriage 36 is positioned with respect to the first and second traveling tracks Lg, Rg, and the guide Comprising a position adjusting section 79 or the like to finely adjust the position of the car 36.

  The fixing portion 78 has a long hole 81 formed in the slider 75 extending in the width direction of the gantry 33, and a pair of screws 82 that pass through the long hole 81 and are attached to the front surface 51 b of the main body portion 51. Is provided. In addition, the position adjustment unit 79 penetrates the bracket 85, which is formed to protrude forward from the front surface 51 b of the main body 51 in order to adjust the position of the positioning roller 77 with respect to the main body 51. A bolt 86 as a front abutting member disposed with its tip abutting against the holding member 76 and a pair of nuts 87 as a front adjusting member screwed into the bolt 86 across the bracket 85 are provided. .

  The second positioning unit 72 is a slider (not shown) as a rear position changing member disposed so as to be movable in the width direction of the gantry 33 with respect to the back surface 51c of the main body 51, and is directed rearward from the slider. And a holding member 76 ′ as a rear roller support member formed by projecting and supported by the holding member 76 ′ so as to be rotatable about an axis extending in the vertical direction, and the outer peripheral surface is in the first and second traveling directions. Positioning roller 77 ′ as a second roller at the rear, which is in contact with the side surface Sw inside the tracks Lg, Rg, a fixing portion (not shown) for fixing the slider to the main body 51 at a predetermined position, the slider Is moved in the width direction of the gantry 33 so that the guide carriage 36 is positioned with respect to the first and second traveling tracks Lg and Rg, and the guide carriage 3 Comprising a position adjusting section 79 'or the like to finely adjust the position.

  The fixing portion has a long hole (not shown) formed in the slider so as to extend in the width direction of the gantry 33, and a pair of screws (not shown) that are attached to the back surface 51c of the main body 51 through the long hole. Prepare. The position adjusting unit 79 ′ includes a bracket 85 ′ formed to protrude rearward from the back surface 51c of the main body 51 in order to adjust the position of the positioning roller 77 ′ with respect to the main body 51, and the bracket 85 ′. And a bolt 86 'as a rear abutting member disposed with its tip abutting against the holding member 76', and a rear adjusting member screwed with the bolt 86 'across the bracket 85' As a pair of nuts 87 '.

  When the operator places the guide carriage 36 on the gantry 33, the operator loosens the screws of the fixing portions 78 and 78 ′ in the first and second positioning units 71 and 72 of the carriage positioning units 70. Each slider is placed so as to be movable with respect to the main body 51, and the nuts 87 and 87 ′ are rotated to change the positions of the bolts 86 and 86 ′. The traveling rollers 66 and 66 ′ are brought into contact with the upper surfaces Su of the first and second traveling tracks Lg and Rg, and the positioning rollers 77 and 77 ′ are moved to the first and second traveling tracks Lg and Rg. Place between side surfaces Sw.

  Subsequently, the operator places the guide carriage 36 at a predetermined position in the width direction of the gantry 33, then rotates the nuts 87, 87 ′ to change the positions of the bolts 86, 86 ′, and positioning rollers 77, 77 ′ is brought into contact with the side surfaces Sw of the first and second traveling tracks Lg and Rg, and the screws of the fixing portions 78 and 78 ′ are tightened to fix the sliders to the main body 51.

  In this manner, the guide carriage 36 can be positioned with respect to the gantry 33 and the position of the guide carriage 36 with respect to the gantry 33 can be adjusted.

  Next, a method for laying a cable (not shown) by the propulsion method using the pipe propulsion device 31 will be described.

  FIG. 13 is a first diagram for explaining the cable laying method according to the embodiment of the present invention, and FIG. 14 is a second diagram for explaining the cable laying method according to the embodiment of the present invention.

  In the figure, hi is a propulsion pipe, 12 is a propulsion pipe row, 14 is a starting shaft, 15 is a main pushing device, and 84 is a reaching shaft as a second shaft.

  First, as shown in FIG. 13, by operating the main pushing device 15, the propelling tube row 12 is pushed into the ground and propelled. Then, as shown in FIG. 14, when the leading propulsion pipe h1 of the propulsion pipe row 12 reaches the reaching shaft 84, the leading propulsion pipe h1 is recovered, and a cable is placed in the propulsion pipe row 12 that becomes a hollow body. Laid.

  In the case of the propulsion pipe row 12 using the pin joint ki, as shown in FIG. 15, the leading propulsion pipe h 1 and the propulsion pipe row 88 formed of a hollow body are connected to the leading jig 89 in the reach shaft 84. By moving the main pusher 15 in the reverse direction, by retracting the propelling tube row 12 and withdrawing it from the ground, replacing it with the propelling tube row consisting of hollow bodies, Cables can also be laid.

  Thus, in the present embodiment, as each propulsion pipe hi on the gantry 33 is moved forward, the plurality of guide carriages 36 move forward with the propulsion pipes supported at a plurality of locations. As a result, the propulsion pipe will not swing from side to side. Therefore, the propulsion tube row 12 can be pushed straight into the ground in a straight traveling state, and can be propelled stably in the ground.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

12 row of propulsion pipes 31 pipe propulsion device 33 mount 35 former pusher 36 guide carriage hi propulsion tube

Claims (6)

In a pipe propulsion device that pushes a propulsion pipe row composed of a plurality of propulsion pipes into the ground and propels it,
(A) a pedestal arranged extending in the propulsion direction of the propulsion pipe row in the start shaft ,
(B) a main pushing device that is disposed at a rear end of the gantry and moves each propulsion pipe forward by pushing a rear propulsion pipe among the plural propulsion pipes;
(C) having a guide device disposed in front of the main pushing device and supporting the propulsion pipe on the gantry,
(D) The guide device includes a plurality of guide carriages that are moved forward in a state where the propulsion pipes are clamped at one or more places and supported as the propulsion pipes on the gantry are moved forward. Prepared ,
(E) The gantry includes first and second traveling tracks formed on the left and right in the width direction for causing the guide carriages to travel in accordance with the movement of the propelling pipe row.
(F) Each of the guide carriages is provided with a first roller rotatably disposed around an axis extending in the width direction of the gantry, and a first roller rotatably disposed around an axis extending in the vertical direction of the gantry. Two rollers, the first roller is rotated while being in contact with the first contact surfaces of the first and second traveling tracks, and the second roller is rotated on the second of the first and second traveling tracks. abutment surface and while in contact by rotating, is moved forward, tubes propulsion device according to claim Rukoto to propel the propulsion tube array of. When each guide carriage reaches the front end of the gantry, it is removed from the gantry, retracted to a predetermined location in the start shaft, and then transported to the rear end of the start shaft, and the rear propulsion pipe and jack The tube propulsion device according to claim 1, wherein the tube propulsion device is placed on a gantry in a space formed therebetween. (A) The guide carriage includes a main body portion that extends between the first and second traveling tracks, and a propelling tube support portion that sandwiches and supports the propelling tube ,
(B) at both ends of the body portion, the first tube propulsion apparatus according to claim 1 or 2 traveling roller unit having a second roller Ru is disposed. Before SL guide carriage, the tube propulsion apparatus according to claim 1, comprising a pair of positioning units for adjusting the position of the guide carriage with respect to the gantry. Each positioning unit, said second roller, pipe propulsion apparatus according to claim 4 comprises a position adjusting unit for adjusting the position of the guide carriage with respect to the gantry by adjusting the position relative to the body portion. (A) The positioning unit includes a holding member that is movably disposed with respect to the main body and rotatably supports the second roller;
(B) The position adjusting portion is a bracket formed by projecting from the main body, a bolt penetrating the bracket and having its tip abutting against the holding member, and screwed with the bolt. The pipe propulsion device according to claim 5, further comprising a nut, wherein the position of the guide carriage is adjusted by changing a position of the bolt.

Images