JP3581619B2 - Apparatus and method for removing and filling back pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus and method for removing and refilling pipes for removing and filling back pipes such as tunnels and pipes buried in the ground.
[0002]
[Prior art]
When constructing a new tunnel in the ground, tunnels and pipes that are not already in use may be buried underground. In this case, remove unused tunnels and pipes, refill them, and renew them. Need to dig a tunnel. An example of such a pipe wall removal and backfilling method is a “tunnel backfilling method” described in JP-A-5-71298.
[0003]
In the tunnel backfilling device disclosed in the “tunnel backfilling method” described in this publication, an inner cylinder that fits the outer diameter of a segment (tunnel) is provided, and an outer shell is connected to the inner cylinder with a partition wall. An annular cutter (face plate) is provided in front of the partition between the inner cylinder and the outer shell, while a propulsion jack is provided at the rear of the partition, and a core cutter for breaking the segment in the outer shell, A placement tube for ejecting the backfill material is provided.
[0004]
Therefore, while the cutter is rotated by the motor, the inner cylinder and the outer shell are advanced by the propulsion jack, so that the outer periphery of the segment is excavated in an annular shape by the cutter, and the device is advanced into the space formed. While the backfill material is ejected from the installation pipe and backfilled, the existing segment can be broken and dismantled by the core cutter.
[0005]
[Problems to be solved by the invention]
However, in the conventional tunnel backfilling device described above, the cutter provided at the front part of the inner cylinder and the outer shell excavates the outer periphery of the existing segment in an annular shape so that the entire device moves forward. It has become. Therefore, a space for accommodating the cutter with respect to the inner cylinder is required, and there is a problem that the outer shell becomes large and the apparatus becomes large. In addition, since the cutter excavates the outer periphery of the existing segment in an annular shape, there is a problem that the range of backfilling with the tunnel portion becomes large, and a large amount of backfilling material is required, which increases costs.
[0006]
The present invention solves such a problem, and provides an apparatus and method for removing and refilling pipe tubes that reduce the size and weight of the apparatus and reduce the cost by minimizing the required backfill material. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the tube removal and refill apparatus of the invention of claim 1 is a device for removing and refilling a tube reed having a cylindrical shape embedded in the ground. A slightly large-diameter apparatus body, a cutter drum having a rear part rotatably supported by the apparatus body, a front part fitted to the outer periphery of the end of the tube, and a cutter provided at the front end, and the cutter Drum driving means for rotationally driving the drum; propulsion means for advancing the apparatus main body by obtaining a propulsion reaction force from a surrounding ground or the pipe rod; and penetrating from the apparatus main body into the pipe rod. Cutting means for cutting from the inside, discharging means for discharging the cut piece of the cut tube rod to the outside, and filling means for filling backfilling material behind the apparatus main body , the propulsion means, Between the rear part of the apparatus main body and a partition wall movably fitted to the rear part A propulsion jack that is mounted, and a traction jack that is interposed between a front portion of the apparatus main body and a gripper that enters the tube rod from the device body and presses against the inner wall of the tube rod, The apparatus main body is provided with a support jack for holding the apparatus main body with respect to the pipe rod .
[0008]
According to a second aspect of the present invention, the traction jack has an alignment function for aligning the apparatus main body when the apparatus main body moves forward .
[0009]
According to a third aspect of the present invention, the cutting means includes a first cutting mechanism for cutting the pipe rod in the circumferential direction and a second cutting mechanism for cutting the pipe rod in the axial direction. The second cutting mechanism has a pair of opposing disk cutters.
[0010]
According to a fourth aspect of the present invention, the main body of the apparatus main body includes an outer tube and an inner tube, and a fitting portion that is fitted to the outer periphery of the end portion of the pipe rod. The cutter drum is rotatably supported between the inner cylinder and the inner cylinder.
[0011]
Further, in the pipe rod removal and backfilling apparatus according to the fifth aspect of the invention, the apparatus main body has a cylindrical portion fitted to the outer periphery of the end portion of the pipe rod, and the cutter drum is disposed on the outer peripheral portion of the cylindrical portion. It is characterized by being supported rotatably.
In the pipe rod removal and backfilling apparatus according to the sixth aspect of the invention, the front end portion of the apparatus main body is fitted to the outer periphery of the end portion of the pipe cup together with the cutter drum, while a support wall is formed at an intermediate portion of the apparatus main body. And a drive motor as the drum drive means is mounted on the apparatus main body behind the support wall, and the drive gear of the drive motor meshes with an internal ring gear fixed to the rear end of the cutter drum. It is a feature.
[0012]
According to a seventh aspect of the present invention, there is provided a method for removing and refilling a pipe drum, wherein the cutter drum is rotated while the cutter drum is fitted to the outer periphery of an end of a cylindrical pipe pipe embedded in the ground. The pipe drum is cut from the inside and removed forward while being filled with a backfilling material while propelling the cutter drum by obtaining a propulsion reaction force from a surrounding natural ground or the pipe rod. is there.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a schematic cross-sectional view of a pipe rod removal and backfilling apparatus according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view showing a tip end of a drum cutter, FIG. 3 is a plan view of a cutting edge, and FIG. -IV shows a cross section.
[0015]
As shown in FIG. 1 to FIG. 4, the pipe rod removal and backfilling apparatus according to the present embodiment cuts and removes pipe rods P such as tunnels and pipes already buried in the ground, and then removes this space. In this embodiment, the pipe rod P is formed of a segment S connected by bolts and the like and a concrete C lined on the inner wall surface of the segment S. .
[0016]
In this removal backfilling apparatus, the apparatus main body 11 has a cylindrical shape that is substantially the same diameter as the outer diameter of the pipe rod P, and a support wall 12 is formed in the middle part. An outer cylinder 13 and an inner cylinder 14 positioned on the outer periphery of the pipe rod P are extended at a predetermined interval at the front portion of the apparatus main body 11, and a cutter drum is interposed between the outer cylinder 13 and the inner cylinder 14. 15 is located. The cutter drum 15 has a plurality of cutting edges 16 attached to the front end portion along the circumferential direction, a rear end portion rotatably supported by the apparatus main body 11 by a bearing 17 and an internal tooth ring gear 18 fixed thereto. A drive motor 19 is attached to the apparatus main body 11, and a drive gear 20 of the drive motor 19 is engaged with the ring gear 18.
[0017]
Therefore, when the drive motor 19 is driven and the drive gear 20 is driven to rotate, the cutter drum 15 can be rotated via the ring gear 18, and the cutting edge 16 at the front end disturbs the earth and sand around the pipe rod P. can do. In this case, the rotation region of the cutting edge 16 is slightly larger than the outer diameter of the outer cylinder 13 and slightly smaller than the inner diameter of the inner cylinder 14.
[0018]
A first seal 21 and a second seal 22 along the circumferential direction are provided on the inner peripheral surface of the front end of the inner cylinder 14 at a predetermined interval, and each of the seals 21 and 22 is an outer periphery of the pipe rod P by a leaf spring. It is in sliding contact with the surface to prevent infiltration of earth and sand and muddy water. Further, seals 23 and 24 are provided between the outer cylinder 13 and the cutter drum 15 and between the cutter drum 15 and the inner cylinder 14 to prevent intrusion of earth and sand and muddy water.
[0019]
A cylindrical partition wall 25 is fitted on the inner peripheral surface of the rear portion of the apparatus body 11, and a plurality of propulsion jacks 26 arranged in parallel in the circumferential direction are installed between the support wall 12 and the partition wall 25. A plurality of backfilling material filling mechanisms 27 (filling means) are provided in the partition wall 25. A support jack 28 is provided on the front side of the support wall 12 of the apparatus body 11 to hold the apparatus body 11 with respect to the pipe rod P.
[0020]
Further, a support cylinder 29 is extended from the support wall 12 to the center side of the pipe rod P from the support wall 12, and a second rotating cylinder 31 having substantially the same length is provided on the outer periphery of the support cylinder 29. The first rotary cylinder 30 having a short length is fitted to the outer peripheral portion of the second rotary cylinder 31 so as to be rotatable. A main gripper 32 and an auxiliary gripper 33 are rotatable relative to the second rotary cylinder 31 in the circumferential direction at the outer peripheral portion of one axial end portion (left side in FIG. 1) of the second rotary cylinder 31 and are They are mounted so that they can move relative to each other, and can be moved toward and away from each other by a moving jack 34. Each of the grippers 32 and 33 has three legs 35 and 36 that can be pressed against the inner wall surface of the pipe rod P, and can be expanded and contracted by a jack (not shown). Further, a traction jack 38 is installed between the flange plate 37 fixed to the front end portion of the support cylinder 29 and the main gripper 32.
[0021]
Accordingly, in a state where the three legs 35 of the main gripper 32 are pressed against the inner wall surface of the pipe rod P, the traction jack 38 is extended to pull the apparatus main body 11 through the support cylinder 29, and the propulsion jack 26 described above is attached. By extending and pressing the apparatus main body 11, the apparatus main body 11 can move forward by obtaining a propulsion reaction force from the pipe rod P and the surrounding natural ground (propulsion means) . In this case, a part of the propulsive force of the apparatus main body 11 is handled by the traction jack 38, and a part of the propulsion jack 26 is handled by the traction jack 26, and the proportion of the charge can be set as appropriate. At this time, the traction jack 38 is aligned so that the axial center of the pipe rod P and the axial center of the apparatus main body 11 (the outer cylinder 13, the inner cylinder 14, and the cutter drum 15) substantially coincide ( alignment). Function) . When the traction jack 38 is extended by a predetermined stroke, the legs 36 of the auxiliary gripper 33 are pressed against the inner wall surface of the pipe rod P, while the legs 35 of the main gripper 32 are separated from the pipe rod P. The main gripper 32 can be advanced by extending the moving jack 34.
[0022]
Further, a first cutting device 39 as a first cutting mechanism for cutting the pipe rod P in the circumferential direction is mounted on the outer peripheral portion of the first rotating cylinder 30 described above, and the other axial end portion ( A first cutting device 40 as another first cutting mechanism for cutting the tube rod P in the circumferential direction is mounted adjacent to the first cutting device 39 on the outer peripheral portion on the right side in FIG. The first cutting device 39 and the first cutting device 40 constitute cutting means. The first rotating cylinder 30 is provided with second cutting devices 41 and 42 as second cutting mechanisms for cutting the tube rod P in the axial direction, and the apparatus main body 11 is provided with a discharge mechanism for supporting the tube rod P to be cut . A discharge device 43 is provided.
[0023]
The first cutting devices 39 and 40 have substantially the same structure, and the disk cutters 46 and 47 are mounted on the brackets 44 and 45 that are movable in the axial direction along the rails 30a and 31a of the rotary cylinders 30 and 31, respectively. 49 is rotatably supported by 49 and is movable in the radial direction of the pipe rod P. The second cutting devices 41 and 42 have substantially the same structure, and are supported so as to be movable in the axial direction along the rails 50a and 50b of the bracket 50 attached to the first rotating cylinder 30, and the disc cutters 51 and 52 are supported. Is rotatably supported by the motors 53 and 54 and is movable in the radial direction of the pipe rod P. The first and second rotary cylinders 30 and 31 can be rotationally driven by drive motors 55 and 56.
[0024]
Further, in the discharge device 43, a swiveling ring 57 is supported by the swiveling motor 58 on the apparatus main body 11 so as to be swivelable. A lifting platform 60 is supported on the swiveling ring 57 by a lifting mechanism 59. A holding mechanism 62 for the pipe rod P is mounted via the link mechanism 61.
[0025]
Here, the removal and backfilling operation of the pipe rod P by the pipe rod removal and backfilling apparatus of the above-described embodiment will be described.
[0026]
First, the inner cylinder 14 of the apparatus main body 11 is fitted together with the outer cylinder 13 and the cutter drum 15 to the outer periphery of the end of the pipe rod P embedded in the ground, and in this state, the drive motor 19 is driven to drive the ring gear 18. , The outer periphery of the pipe rod P is disturbed by a large number of cutting edges 16 located at the front end. Simultaneously with this operation, each leg portion 35 of the main gripper 32 is pressed against the inner wall surface of the pipe rod P. In this state, the traction jack 38 is extended, the propulsion jack 26 is extended, and the support jack 28 is contracted. Thus, the propulsive force acts on the apparatus main body 11 to advance. In this case, the apparatus main body 11, the cutter drum 15 and the like are aligned with respect to the pipe rod P by the extension of the pulling jack 38.
[0027]
As the apparatus main body 11 advances, the segment S and concrete C constituting the pipe rod P are internally cut by the cutting devices 39 to 42, and the cut pieces are brought outside using the discharge device 43, a crane (not shown), and the like. It is discharging. That is, first, the first cutting device 39, 40 is moved to a predetermined axial position, and the disk cutters 46, 47 are rotationally driven, and the first cutting device 39 together with the rotary cylinders 30, 31 by the drive motors 55, 56. , 40 are moved in the circumferential direction to cut the pipe rod P into ring-shaped pieces having a predetermined length. Next, in a state in which the discharge device 43 holds the ring-shaped piece of the pipe rod P, the second cutting devices 41 and 42 are placed in a predetermined position, that is, between the disk cutters 51 and 52. The ring-shaped piece of the pipe rod P is cut into a fan-shaped piece having a predetermined length by moving in the axial direction while the lever cutters 51 and 52 are rotationally driven. And the discharge device 43 discharges the fan-shaped piece of the held pipe rod P to the outside.
[0028]
Thus, in the apparatus main body 11, each cutting device 39-42 cuts and discharges the tube rod P, and then removes the tube rod P, and then again, as described above, the tube by the cutter drum 15 After the apparatus main body 11 has moved forward due to disturbance around the outer periphery of the kite P, the traction jack 38, the main gripper 32, and the auxiliary gripper 33 are left as they are, and the propulsion jack 26 is contracted, and at the same time, the filling mechanism 27 is embedded behind the partition wall 25. Fill with return material. Next, each leg portion 36 of the auxiliary gripper 33 is pressed against the inner wall surface of the pipe rod P, while each leg portion 35 of the main gripper 32 is separated from the inner wall surface of the tube rod P. In this state, the movable jack 34 is moved. By extending, the main gripper 32 can be advanced. Thereafter, the leg portions 35 of the main gripper 32 are pressed against the inner wall surface of the pipe rod P, and the movable jack 34 is contracted while the leg portions 36 of the auxiliary gripper 32 are separated from the inner wall surface of the tube rod P. The auxiliary gripper 33 is pulled toward the main gripper 32. By performing this repetitive work for a predetermined distance, it is possible to remove all the existing pipe rods P and perform backfilling.
[0029]
As described above, in the pipe rod removal and backfilling apparatus of this embodiment, the cylindrical cutter drum 15 is placed on the outer periphery of the end portion of the pipe rod P from the apparatus main body 11 located at the end portion of the existing pipe rod P. In this state, the cutter drum 15 can be propelled while rotating. Therefore, it is not necessary to excavate the natural ground around the pipe rod P, the propulsion speed is increased, the work efficiency is improved, the backfill area together with the tunnel portion is reduced, the amount of backfill material is reduced, and the cost is reduced. Can be reduced. Further, by fitting the cutter drum 15 from the apparatus main body 11 located at the end portion of the pipe rod P to the outer periphery of the end portion of the pipe rod P, the drive motor 19 that rotationally drives the cutter drum 15 is connected to the pipe rod P. Can be disposed on the apparatus main body 11 without being disposed on the outer periphery of the apparatus, and can be reduced in size and weight by being formed with a small diameter of the entire apparatus.
[0030]
FIG. 5 is a cross-sectional view showing a tip end portion of a drum cutter in a pipe rod removal and backfilling apparatus according to a second embodiment of the present invention, and FIG. 6 is a plan view of a cutting edge. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in embodiment mentioned above, and the overlapping description is abbreviate | omitted.
[0031]
As shown in FIGS. 5 and 6, in the pipe rod removal and backfilling apparatus of the present embodiment, an inner cylinder 14 located on the outer peripheral portion of the pipe rod P is extended at the front portion of the apparatus main body 11. A cutter drum 71 is rotatably supported on the outer peripheral portion of the cylinder 14, and the cutter drum 71 has a plurality of cutting edges 72 attached to the front end portion along the circumferential direction. The front end portion of the cutter drum 71 is alternately provided with water jets 73 and openings 74 for reducing propulsion resistance located between the cutting edges 72.
[0032]
Accordingly, the inner cylinder 14 of the apparatus main body 11 is fitted together with the cutter drum 71 to the outer periphery of the end portion of the pipe rod P embedded in the ground, and in this state, the cutter drum 71 is rotated by the drive motor 19 so that the front end The outer periphery of the tub P is disturbed by a large number of cutting edges 72 located in the section. At this time, by spraying water with each water jet 73, the ground becomes soft and the resistance is reduced, and disturbance by the cutting edge 72 is facilitated. In addition, the disturbance of the cutting edge 72 improves the fluidity of the earth and sand and reduces the propulsion resistance. Furthermore, since the outer cylinder outside the cutter drum 71 is eliminated, the apparatus can be simplified.
[0033]
In the above-described embodiment, the configuration and number of the cutting devices 39 to 42 and the discharge device 43 provided in the apparatus main body 11 are not limited to the embodiment, and the size and shape of the pipe rod P are not limited. Accordingly, it may be set as appropriate. Further, the arrangement positions of the propulsion jack 26 and the traction jack 38 are not limited to the embodiment. Furthermore, the water jet 73 of the second embodiment may be applied to the first embodiment.
[0034]
【The invention's effect】
As described above in detail in the embodiment, according to the pipe rod removal and backfilling apparatus of the invention of claim 1, the rear part of the cutter drum is rotatably supported on the apparatus main body, and the front part of the cutter drum is connected to the pipe. The cutter is fitted to the outer periphery of the end of the rod, and the cutter drum can be driven to rotate by the drum driving means. Cutting means that allows advancement and enters the tube from the device main body and cuts the tube from the inside , discharge means for discharging the cut pieces of the cut tube to the outside, and a backfill material behind the device main body And a propelling means interposed between a rear part of the apparatus main body and a partition fitted to the rear part; a front part of the apparatus main body; A gripper that penetrates into the wall and presses against the inner wall Consist of the interposed a traction jack between, is provided with the support jacks for holding the device body relative Kanmizo the apparatus main body, the fitting portion fitted to the outer periphery of the pipe culvert including cutter drum tube Since it is only slightly larger in diameter than the outer periphery of the dredging, it is not necessary to excavate the ground surrounding the pipe dredging, and the propulsion speed can be increased to improve work efficiency and backfilling The area can be reduced, the required amount of backfilling material can be reduced, and the cost can be reduced. Further , the use of the propulsion jack, the traction jack, and the support jack enables stable propulsion of the apparatus main body.
[0035]
In addition, according to the pipe rod removal and backfilling apparatus of the second aspect of the present invention, since the traction jack has an alignment function for aligning the apparatus main body when the apparatus main body moves forward , the traction jack aligns the apparatus main body. Therefore, proper propulsion is possible by eliminating the contact between the pipe rod and the cutter drum.
[0036]
Moreover, according to the pipe rod removal and backfilling apparatus of the invention of claim 3, the cutting means includes a first cutting mechanism that cuts the pipe rod in the circumferential direction, and a second cutting mechanism that cuts the tube rod in the axial direction. Since the second cutting mechanism has a pair of opposing disk cutters, the tube can be cut efficiently in a short time, and workability can be improved.
[0037]
Moreover, according to the pipe rod removal and backfilling apparatus of the invention of claim 4, the fitting portion that is fitted to the outer periphery of the end portion of the pipe rod in the apparatus main body is constituted by the outer cylinder and the inner cylinder, Since the cutter drum is rotatably supported between the inner cylinder and the inner cylinder, the output of the drum driving means can be reduced by reducing the rotational resistance of the cutter drum.
[0038]
Moreover, according to the pipe rod removal and backfilling apparatus of the fifth aspect of the present invention, the cutter drum is rotatably supported on the outer peripheral portion of the cylindrical portion fitted to the outer periphery of the end portion of the pipe rod in the apparatus main body. Can be simplified.
According to the pipe rod removal and backfilling apparatus of the sixth aspect of the invention, the front end portion of the apparatus main body is fitted together with the cutter drum to the outer periphery of the end portion of the pipe rod, while the support wall is formed at the intermediate portion of the apparatus main body. A drive motor as a drum drive means is mounted on the rear apparatus body, and the drive gear of the drive motor is engaged with an internal ring gear fixed to the rear end of the cutter drum, so that the cutter drum is driven to rotate. It is not necessary to dispose the drive motor on the outer periphery of the pipe rod, and the entire apparatus can be reduced in size and weight.
[0039]
Further, according to the pipe rod removal and backfilling method of the seventh aspect of the invention, the cutter drum is rotated in a state in which the cutter drum is fitted to the outer periphery of the end portion of the cylindrical pipe rod embedded in the ground. At the same time, while the propulsion reaction force was obtained from the surrounding natural ground or pipe rod , the pipe rod was cut from the inside and removed forward so that it was filled with backfill material . Since the fitting part that fits on the outer periphery is only slightly larger than the outer periphery of the pipe rod, there is no need to excavate the ground around the pipe rod, and the propulsion speed increases and the work efficiency increases. In addition, the backfill area can be reduced, the required amount of backfill material can be reduced, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a tube repellent removal backfilling apparatus according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a tip end portion of a drum cutter.
FIG. 3 is a plan view of a cutting edge.
4 is a cross-sectional view taken along the line IV-IV in FIG.
FIG. 5 is a cross-sectional view showing a tip end portion of a drum cutter in a pipe rod removal backfilling apparatus according to a second embodiment of the present invention.
FIG. 6 is a plan view of a cutting edge.
[Explanation of symbols]
11 Device body 13 Outer cylinder 14 Inner cylinder 15 Drum cutter 16 Cutting edge (cutter)
19 Drive motor (drum drive means)
25 Bulkhead 26 Propulsion jack 27 Filling mechanism 29 Support cylinder 30, 31 Rotating cylinder 32 Main gripper 38 Tow jack 39, 40 First cutting device 41, 42 Second cutting device 43 Discharge device 71 Drum cutter 72 Cutting edge (cutter)
73 Water Jet 74 Opening

Claims (7)

A device for removing and refilling a cylindrical tube buried in the ground, the device body having a diameter slightly larger than the tube and a rear part rotatably supported by the device body Is fitted to the outer periphery of the end of the pipe rod and is provided with a cutter at the front end, drum driving means for rotationally driving the cutter drum, and a reaction force from the surrounding ground or the pipe rod. A propulsion means for advancing the device body obtained, a cutting means for entering the tube rod from the device body and cutting the tube rod from the inside, and a discharge for discharging a cut piece of the cut tube rod to the outside And propulsion means interposed between a rear part of the apparatus main body and a partition wall movably fitted to the rear part. A propulsion jack, a front portion of the apparatus main body, and the pipe rod from the apparatus main body. A traction jack interposed between the gripper and intruding into the inner wall of the tube rod, and a support jack for holding the device body with respect to the tube rod is provided on the device body This is a tube filling and refilling device. 2. The pipe rod removal and backfilling apparatus according to claim 1, wherein the traction jack has a centering function for aligning the apparatus main body when the apparatus main body moves forward. 2. The tube rod removal and backfilling apparatus according to claim 1, wherein the cutting means includes a first cutting mechanism that cuts the tube rod in a circumferential direction and a second cutting mechanism that cuts the tube rod in an axial direction. And the said 2nd cutting mechanism has a pair of opposing disk cutters, The removal refilling apparatus of the pipe rod characterized by the above-mentioned. 2. The apparatus according to claim 1, wherein the main body of the apparatus includes an outer cylinder and an inner cylinder, and a fitting portion that is fitted to an outer periphery of an end of the pipe casing includes the outer cylinder and the inner cylinder. The pipe drum removal and backfilling apparatus, wherein the cutter drum is rotatably supported between the pipes. 2. The pipe rod removal and backfilling apparatus according to claim 1, wherein the apparatus main body has a cylindrical portion fitted to an outer periphery of an end portion of the pipe rod, and the cutter drum is freely rotatable on the outer peripheral portion of the cylindrical portion. A tube filling and backfilling device characterized by being supported. 2. The pipe rod removal and backfilling apparatus according to claim 1, wherein the end of the apparatus main body is fitted to the outer periphery of the end of the pipe casing together with the cutter drum, and a support wall is formed at an intermediate portion of the apparatus main body. And a drive motor as the drum drive means is mounted on the apparatus main body behind the support wall, and the drive gear of the drive motor meshes with an internal ring gear fixed to the rear end of the cutter drum. Characteristic tube removal and backfilling device. In the method for removing and refilling a tube reed using the tube retraction and backfilling device according to claim 1, in a state in which the cutter drum is fitted to the outer periphery of the end of a tubular reed that has a cylindrical shape embedded in the ground. Rotating the cutter drum and receiving propulsion reaction force from surrounding ground or the pipe rod while propelling the cutter drum, cutting the pipe rod from the inside and removing it forward to fill with backfill material A method for removing and refilling pipes.

Images