KR20200108770A - Low overhead clearance boring machine and method assembling the same - Google Patents

Abstract

A low empty head excavator includes an excavator main body. The excavator main body comprises: lift mechanisms disposed on left and right sides thereof; and a crane mechanism detachably mounted thereon. Each lifting mechanism has a reference position arranged in parallel with a horizontal frame on the left and right sides of the excavator main body, and an extended position arranged to extend outward from the left and right sides of the excavator main body. Each lifting mechanism lifts the excavator main body up to a predetermined height in the extended position arranged to extend outward from the left and right sides of the excavator main body. The crane mechanism includes a crane support member and a slide beam. The crane support member is rotatably mounted on the excavator main body. The slide beam is mounted on the crane support member, and allows a chain block to be slidably hangable on the slide beam. The slide beam is turnable along with rotation of the crane support member mounted on a tubing member of the excavator main body. According to the present invention, the low empty head excavator can convey the excavator main body even in a space with a limited height from the ground.

Description

Low overhead excavator and its assembly method {LOW OVERHEAD CLEARANCE BORING MACHINE AND METHOD ASSEMBLING THE SAME}

The present application relates to a low-hole excavator including an excavator body and a traveling body mountable to the excavator body, and an assembly method thereof.

In the foundation pile construction work in a construction site, excavation work is performed using an excavator which combines a trestle and a turning type boring machine. Specifically, an all-casing method is used in which a boring machine is rotated and the casing tube is pushed into the ground while rotating, and the soil in the casing is excavated by a hammer grab suspended from a mount.

For example, in the all-casing method disclosed in Japanese Unexamined Patent Application Publication No. Hei 10-205261 and Japanese Unexamined Patent Application Publication No. Hei 10-205263, first, a clamp device provided by a boring machine by a hydraulic device, a swing motor, and a drawing cylinder Work your back Thereby, the casing tube is clamped by the clamping device, and is inserted into the ground by the drawing cylinder while being rotated by the swing motor. Subsequently, the inside of the casing tube is excavated using a hammer grab suspended from the mount, and the excavated soil is laid in a place away from the casing tube.

This excavation work is performed by lowering the hammer grab suspended from the mount into the casing tube, releasing the winch, and dropping the hammer grab from a predetermined height. By dropping the hammer grab, the shell opened at the tip of the hammer grab rushes into the ground, and by winding up the winch from this state, the shell is closed and soil or the like is pumped up.

In the above-described excavator, excavation and conveyance are performed while an excavating unit such as a hammer grab or a casing tube is suspended on a mount, so a large work space is required above the excavator. For this reason, there is a problem that such an excavator cannot be used in a place with a roof or in a place with a height limitation such as a tunnel. As a means of improving this, a suspension conveying apparatus in which the mount is slid in a horizontal direction so as to convey a casing tube, H steel, etc. is disclosed (Japanese Unexamined Patent Publication No. Hei 8-48492). This conveying device moves to the vicinity of a narrow work place where space is limited in the height direction while being mounted on a truck that can be moved frequently. Then, the rails on which the conduit or the like is suspended is slid to the left and right at the distal end, and the rails are repeatedly filled in a predetermined excavation site.

Japanese Patent No. 5621026 discloses an excavator having a pivoting horizontal frame on a base portion having a traveling body. This low altitude excavator has an arm that can be opened and closed on a post supporting the horizontal frame, and is configured so that the height of the horizontal frame can be changed by opening and closing the arm.

Japanese Patent No.6088093 has a lift mechanism capable of horizontally supporting the excavating unit in a range from the minimum height required for movement to the minimum height essential for excavation, and for horizontally moving the excavating unit by the lift mechanism. A low altitude excavator is disclosed that adjusts the height of a horizontal frame.

As described above, in a conventional excavator as disclosed in Japanese Unexamined Patent Application Publication No. Hei 10-205261 and Japanese Unexamined Patent Application Publication No. Hei 10-205263, a rotary press-fitting device is installed at an excavation site by a heavy machine such as a crane. Then, since the excavation unit such as a casing tube or hammer grab for excavating through this rotary press-fitting device is carried in by a heavy machine, it is difficult to work in a place with a narrow working space. In addition, there is a problem in that excavation of a sufficient depth cannot be performed because a large-sized crane cannot be used in a place where the space in the height direction is limited.

In addition, even with a conventional low-altitude excavator, when performing excavation work such as reforming or reinforcing the foundation in the basement of an existing building, pass it through a place that seems to be limited by the space in the height direction than the excavation site, or If there are obstacles from, you must avoid them and move them. For this reason, when moving the excavator to a target excavation site, it is necessary to disassemble the excavation unit and a part of the horizontal frame for horizontally moving the excavation unit and assemble it at the excavation work site.

In the low-air head excavator disclosed in Japanese Patent No. 5621026, the height of a horizontal frame supporting the excavating unit so as to be horizontally movable is set to a minimum height indispensable for excavation. At this time, even if the horizontal frame was made to move slightly up and down by opening and closing the arm provided on the post, it was difficult to move it avoiding the obstacle from the beam or the ceiling in the lower existing building.

[0003] In the low-hole excavator disclosed in Japanese Patent No. 6080903, the excavator main body is transported to a predetermined excavation site, and a horizontal frame is brought in and assembled there using a crane or the like. For this reason, assembly was difficult in a place restricted by the space in the height direction. In addition, there is a problem that a separate crane has to be prepared, and the work becomes complicated.

It is an object of the present invention to provide an excavator with a low altitude head and an assembly method thereof having an excavator body and a traveling body that frequently makes the excavator body. The excavator body and the traveling body are each transported to a predetermined excavation site, and can be easily assembled and disassembled there.

In order to achieve the above object, the excavator disclosed herein has an excavator body, and the excavator body includes a tubing portion for inserting an excavating unit into the ground, and a horizontal frame supporting the excavating unit horizontally on the tubing portion. Is installed, and the excavator main body further includes a lift mechanism disposed on both left and right sides of the excavator main body, and a crane mechanism detachably mounted,

The lift mechanism has a reference position arranged parallel to the horizontal frame on both left and right sides of the excavator body, and an extended position extending outwardly from both sides of the excavator body, and the lift mechanism has both sides of the excavator body. In the extended position extending outward from and arranged, the excavator body is lifted up to a predetermined height,

The crane mechanism includes a crane support member rotatably attached to the excavator body, and a slide beam attached to the crane support member and for slidably suspending the chain block, and the slide beam is tubing of the excavator body It turns according to the rotation of the crane support member attached to the part.

In addition, in the method of assembling a low-hole excavator disclosed herein, the excavating unit is put into the ground by a tubing part, and a traveling body is mounted on the excavator body that supports the excavating unit horizontally by a horizontal frame on the tubing part. It is an assembly method of two excavators, and in this assembly method, the lift mechanism installed in the excavator main body is placed on the ground by arranging the lift mechanism installed in the excavator main body in the extended position extending outward from the reference position arranged parallel to the horizontal frame on both sides of the excavator main body, The excavator body mounted on the transport vehicle is lifted up to float from the transport vehicle, and the transport vehicle is removed from the excavator body supported on the ground, and then suspended and transported by a crane mechanism mounted on the excavator body. Attach to the main body.

According to the low-elevation excavator of the present invention disclosed herein, the excavator body is separated from the traveling body for frequent use of the excavator body, since it has a lift mechanism having an extended position extending outward from both sides of the excavator body. The excavator body can be transported and installed alone to a predetermined place, and as a result, the excavator body can be transported to a place where the height from the ground is limited.

Further, according to the low-elevation excavator of the invention disclosed in the present application, since a crane mechanism that is detachably attached to the excavator body is provided, the traveling body can be attached to the excavator body by using this crane mechanism.

In addition, according to the method of assembling a low-altitude excavator according to the invention disclosed herein, the excavator body can be transported and installed alone to a predetermined location by means of a lift mechanism installed in the excavator body, and the excavator body can be installed at that location. The vehicle can be easily assembled. Further, when assembling the traveling body, the traveling body can be suspended and conveyed by a crane mechanism attached to the excavator main body.

1 is a side view of a low hole head excavator according to an embodiment of the present invention.
2 is a side view of an excavator body mounted on a trailer.
3 is a plan view showing a main part of a horizontal frame and a lift mechanism.
4 is a plan view showing the rotational operation of the lift mechanism.
5 is a plan view of a low-hole head excavator.
6 is a side view of the excavator main body lifted up by a lift mechanism.
7 is a front view of the excavator main body lifted up by a lift mechanism.
Fig. 8 is a side view showing a state in which the excavator body is supported on the ground by a lift mechanism.
Fig. 9 is a side view of the excavator body lifted down to the ground by a lift mechanism.
10 is a side view of a crane post installed in the excavator body.
11 is a diagram showing a step of assembling a crane mechanism to the excavator body.
Fig. 12 is a side view of an excavator main body equipped with a crane mechanism.
13 is a diagram showing a step of suspending a traveling body by a crane mechanism.
14 is a diagram showing a step of attaching a traveling body to one of the excavator main body by a crane mechanism.
15 is a diagram showing a step of attaching a traveling body to the other side of the excavator main body by a crane mechanism.
Fig. 16 is an explanatory view showing a state in which a low altitude excavator travels in a low altitude work space.
17 is an explanatory view showing a state of excavation work in a low altitude work space.
Fig. 18 is a side view of a low altitude excavator whose height is increased by extension posts.

Hereinafter, based on the accompanying drawings, an embodiment of a low-elevation excavator according to the invention disclosed herein will be described in detail. As shown in FIG. 1, the low-hole excavator (hereinafter referred to as an excavator) 10 is an excavator body 11 and a traveling body (crawler) that is attached to the excavator body 11 and makes the excavator body 11 frequently. (15) is provided. Fig. 2 shows a state in which the excavator body 11 from which the crawler 15 is removed is mounted on a transport vehicle (trailer) 20 and transferred to a target excavation site.

The excavator body 11 has a tubing part 12 which is injected into the ground while rotating a casing tube (not shown) having a cutter at its tip as shown in FIG. 1, and is installed on the tubing part 12, A horizontal frame 13 for discharging the soil, etc. excavated by the excavation unit (hammer grab) 22 having an openable shell to a predetermined location, and the horizontal frame 13 on the tubing part 12 , A plurality of posts 17 supported at a predetermined height, and a lift mechanism that is rotatably attached to each of the posts 17 and installed so as to extend outward from positions disposed on both sides of the excavator body 11 ( 41).

As shown in Figs. 3 to 5, four lift mechanisms 41 are provided in total, one pair at a time, on both the left and right sides of the excavator main body 11. In addition, each lift mechanism 41 has a reference position P1 arranged parallel to the horizontal frame 13 on both left and right sides of the excavator main body 11, and a protrusion extending outwardly from both sides of the excavator main body 11 It has a position (P2). The excavator main body 11 in this embodiment has posts 17 at the four corners of the excavator main body 11, respectively, and the lift mechanism 41 interposed the rotation mechanism 42 to each post 17 Is attached.

As shown in Figs. 2 to 4, the lift mechanism 41 includes a hydraulic cylinder device (cylinder main body) 46 having a rod 47 that expands and contracts to a predetermined length. A support plate 43 is attached to the cylinder body 46, and a bracket 44 is attached to the post 17. Since the support plate 43 and the bracket 44 are rotatably connected through the rotation shaft 44a, the lift mechanism 41 can be rotated at a predetermined angle in the horizontal direction with respect to the post 17. In this embodiment, the rotation mechanism 42 includes a support plate 43 attached to the cylinder body 46, a bracket 44 attached to the post 17, and a support plate 43 and a bracket 44. It is provided with a rotating shaft 44a which is connected so that rotation is possible.

The hydraulic pressure for driving is supplied to the cylinder body 46 through a hydraulic unit (not shown) provided in the excavator body 11 or a hydraulic supply device (not shown) connected to the excavator body 11. In addition, the excavator 10 in the state shown in FIGS. 1 and 2 supports the horizontal frame 13 by the respective posts 17. Therefore, in this state, each lift mechanism 41 is not driven, and the rod 47 is accommodated in the cylinder body 46 so as to be expandable and contracted.

As shown in Fig. 1, the crawler 15 is provided with a pair of driving wheels 16a, a plurality of auxiliary wheels 16b, and a rubber crawler belt 16c. The excavator body 11 is provided with a traveling body mounting unit (not shown) to which the crawler 15 is detachably mounted, and a controller (shown) for driving the crawler 15 by remote operation through wired or wireless Is installed, and it is possible to move forward and backward from a distant place, and to adjust the speed and movement of the left and right turns.

As shown in FIG. 5, a circular insertion hole 23 is provided in the central part of the tubing part 12. As shown in FIG. This insertion hole 23 is for pressing into the ground while rotating the casing tube (not shown) or passing the hammer grab 22 downward, and is installed so as to penetrate the base 14 have. A rotary press-fitting ring (not shown) that clamps and drives the outer peripheral surface of the casing tube is provided on the inner side of the insertion hole 23.

As shown in FIG. 5, the horizontal frame 13 is supported by the respective posts 17 disposed at the four corners of the excavator main body 11, respectively. This horizontal frame 13 has a pair of guide rails 27 extending parallel to each other and a carriage 29 moving horizontally along the pair of guide rails 27. Guide grooves (not shown) for placing the carriage 29 in a horizontal direction are formed on each inner surface of the pair of guide rails 27. Further, on the lower side of each guide rail 27, a rack (not shown) made of a plurality of teeth extending in a linear shape along the length direction of the guide rail 27 is provided.

At one end of the carriage 29, a pulley 32 is installed to support the hammer grab 22 by hanging. In addition, a winch 34 is disposed at the other end of the carriage 29. The winch 34 performs a winding operation of the wire 33 for raising and lowering the hammer grab 22 through the pulley 32.

A hammer grab 22 is directly suspended from the pulley 32 installed on the carriage 29. As shown in Fig. 1, the hammer grab 22 is used for deep hole excavation or root cutting of a building foundation, and can be opened and closed at the tip of the cylindrical body part 22a and the body part 22a. It is provided with a pair of shells (22b) that are installed in such a way. A mechanism for opening and closing the shell 22b by the winding operation of the wire 33 is incorporated in the body portion 22a.

Next, an assembly method for attaching and detaching the crawler 15 to the excavator body 11 will be described. First, as shown in FIG. 2, a cylindrical crane support member (crane post) 62 is installed on the excavator main body 11. This crane post 62 is attached within a cylindrical post base 63 mounted on the tubing part 12. As this attachment means, fastening and fixing by bolts and nuts, fixing by magnetic force between magnetic bodies, etc. are considered. When attaching the post base 63 and the crane post 62, the carriage 29 disposed on the horizontal frame 13 is retracted to the front end side of the horizontal frame 13, and the upper side of the tubing part 12 is opened. It is done in one state. In this way, the excavator body 11 equipped with the crane post 62 is loaded onto the trailer 20 or the like, and the crawler 15 is moved to a predetermined excavation site in a state without being attached. Another pair of crawlers 15 are conveyed together with the excavator body 11.

After the excavator body 11 and the crawler 15 arrive at the excavation work site, as shown in FIGS. 6 and 7, four lift mechanisms arranged in pairs in front and rear on both left and right sides of the excavator body 11 ( 41) extends outwardly from the reference position P1 disposed parallel to the horizontal frame 13 on both left and right sides of the excavator body 11 and extends to the extended position P2 disposed. The lift mechanism 41 is rotated by a predetermined angle in the horizontal direction through the rotation mechanism 42 provided between the post 17 and the lift mechanism 41. This lift mechanism 41 extends outward from both sides of the excavator body 11 and also extends outward from both sides of the trailer 20. That is, the lift mechanism 41 extending outward from both sides of the excavator body 11 is opposed to the ground 67, and the distal end of the rod 47 extending from the cylinder body 46 is mounted on the ground 67. Connect to the government (48). In that state, each rod 47 is elongated by hydraulic pressure equally supplied to each cylinder body 46 from a hydraulic unit (not shown), and the excavator body 11 is vertically aligned with the cylinder body 46 Lift up. This lift-up amount may be such that the bottom surface of the excavator body 11 floats several tens of centimeters from the top of the trailer 20.

In this state, as shown in FIG. 8, the trailer 20 is separated from the excavator body 11. When the trailer 20 is separated from the excavator main body 11, the hydraulic pressure is adjusted to reduce the rod 47 and accommodated in the cylinder main body 46 to lift the excavator main body 11 down. And, as shown in FIG. 9, the support leg 68 provided at the bottom part of the excavator main body 11 is provided on the ground 67, and the excavator main body 11 is supported. At that time, by adjusting the amount of extension and contraction of each of the support legs 68, the inclination is adjusted so that the excavator main body 11 is horizontal with respect to the ground 67. Further, in this state, the rod fixing portion 48 is separated from the distal end of the rod 47, so that the lower end of the rod 47 is at a position maintained at a constant height from the ground 67.

In this way, when the installation position of the excavator main body 11 is determined, the crane post 62 is raised to a predetermined height using the rotary press-fitting ring of the tubing portion 12 as shown in FIG. 10. Then, as shown in FIG. 11, the crane mechanism 61 is mounted on the crane post 62 so as to be detachable by a fork lift 21 or the like. As shown in Fig. 12, the crane mechanism 61 includes the crane post 62, a joint post 64 connected to the crane post 62, and a slide beam extending in the horizontal direction from the joint post 64. It has (65). The joint post 64 has a cylindrical shape of substantially the same diameter as the crane post 62. A chain block 66 is slidably attached to the slide beam 65. The slide movement of the chain block 66 can be either manual or electric.

13, the excavator main body 11 is slightly lifted by extending the support leg 68 of the excavator main body 11, and then the bogie 69 on which the pair of crawlers 15 is mounted is attached to the excavator main body ( 11) on the side (right or left). Thereafter, as shown in Fig. 14, the slide beam 65 is pivoted on one crawler 15, and the crawler 15 is suspended and conveyed by the chain block 66, and the excavator body 11 It is disposed on one side and attached to a traveling body mounting portion (not shown) of the excavator body 11. When the mounting is completed, as shown in Fig. 15, the bogie 69 is moved to a side (right or left) different from the side placed next to the excavator body 11, and the slide beam 65 is rotated 180 degrees. Arranged on the other crawler 15, similarly to the above, the crawler 15b is suspended and conveyed by the chain block 66, placed on the other side of the excavator body 11, and the traveling body of the excavator body 11 It is attached to the mounting part (not shown).

After mounting the pair of crawlers 15 on both sides of the excavator main body 11, the crane mechanism 61 is dismantled and the crane post 62 is removed from the excavator main body 11. In addition, the support leg 68 of the excavator body 11 is reduced so that the crawler 15 is installed on the ground 67, and the excavator body 11 is supported by the crawler 15. By completing such a series of assembling operations, the excavator body 11 and the carriage 29 can be slid by the crawler 15 as shown in Fig. 1, and move to a predetermined excavation site, and the hammer Excavation work by grab is possible.

When the predetermined excavation work is completed and is pulled up, the crane mechanism 61 is assembled to the excavator main body 11 again, the crawler 15 is separated from the excavator main body 11, and the excavator is carried out by the lift mechanism 41. The main body 11 is lifted up to a predetermined height, the excavator main body 11 is mounted on the trailer 20, and moves to the next excavation site.

As shown in FIG. 16, the excavator 10 equipped with the crawler 15 is configured to be able to move frequently toward the target excavation site in a state of a low altitude posture, and a hammer grab by the horizontal frame 13 (22) can be suspended from the lowest position for support. In this excavator 10, since the horizontal frame 13 on the base portion 14 is supported by the pillars 17 having approximately the same height as the hammer grab 22, the reference ground 67 The height h11 from the top of the pulley 32 can be regulated to 3 meters or less. Thereby, if there is a space such that the height h01 from the ground 67 to the lowest ceiling surface T1 slightly exceeds 3 meters, it can be frequently moved to the target excavation site as it is.

Next, with reference to FIGS. 16 and 17, the procedure of the excavation operation by the hammer grab 22 will be described. As shown in FIG. 16, the hammer grab 22 is suspended above the tubing part 12 by the wire 33, and is dropped into the insertion hole 23 from the suspended height position. The hammer grab 22 is dropped while the shell 22b is open, and is inserted into the ground as it is. From this state, by winding up the wire 33 by the winch 34, the shell 22b is closed while enclosing the excavated material such as soil or rock.

Thereafter, the winch 34 is wound up and the hammer grab 22 is pulled up from the ground while the shell 22b is closed, and the hammer grab 22 is pulled up above the tubing portion 12. Subsequently, as shown in FIG. 17, the carriage 29 is slid along the guide rail 27, and is moved toward the distal end 13b. Then, by opening the shell 22b at a predetermined position, excavated materials such as dug up soil or rock can be discharged. A place where the space in the height direction is limited by repeating such an operation and moving the hammer grab 22 horizontally by the carriage 29 between the upper part of the tubing part 12 and the discharge place. Excavation and soiling work can be performed easily and efficiently.

The excavator 10 having the above configuration is set to the minimum height that is often possible, but if there is a margin in the space above the excavator, as shown in Fig. 18, the extension posts 18 are attached to each post 17. , The horizontal frame 13 may be set high. Even in such a case, the lift mechanism 41 and the crane mechanism 61 can be used.

The height of the horizontal frame 13 can be set according to the following procedure. First, in the excavator 10 shown in FIG. 1, the rod 47 extended from the cylinder body 46 is connected to the rod fixing portion 48 installed on the ground, and the excavator body 11 is supported on the ground. Then, the fastening of the post fastening part 45 and the post 17 provided on the base part 14 is released. As a result, each of the posts 17 can be separated from the top of the base portion 14, and each of the posts 17 is integrated with the horizontal frame 13 by the respective lift mechanisms 41 on the base portion 14. It is supported at a predetermined height apart from. Thereafter, each rod 47 is increased by the height of the extension post 18 to be extended, and the horizontal frame 13 is lifted up in the vertical direction together with the respective posts 17.

Positioning means are installed at the upper and lower ends of the extension posts 18 to match the connection positions with each other when connecting with the posts 17. The positioning means can be constituted by a convex portion protruding to one of the upper and lower ends of the extension post 18, and a concave portion provided on the other side and fitted to the convex portion. By providing such a positioning means, the center of the post 17 and the extension post 18 is not shifted, and the horizontal frame 13 can be supported in a stable state.

In the work, first, the lower end of the extension post 18 is mounted on the post fastening part 45 provided on the base 14, and then fixed using a fastening member such as a lock pin. Then, each post 17 lifted up by the amount of the work space is lifted down, the lower end of each post 17 is positioned on the upper end of each extension post 18, and then fixed through a fastening member. . After the attachment of all the extension posts 18 is completed, the tip end of each rod 47 is separated from the rod fixing portion 48, and is accommodated in each cylinder body 46. Thereby, the excavator main body 11 can be separated by the crawler 15.

In this way, by making the height of the post 17 variable, the posture of the excavator 10 is kept low, the basement of an existing building in which beams, etc. protrude from the ceiling, or an underpass with limited space in the height direction. It can pass through tunnels and other tunnels. Further, when the excavator moves to a place with a space above the excavator, the position of the horizontal frame 13 can be set to an optimum height suitable for excavation by extending the extension post.

As described above, according to the excavator of the invention disclosed herein, it can be easily carried into an excavation site where the space in the height direction is limited, and can be self-assembled in a state where excavation work can be started. . Thereby, the excavation work at a low altitude can be performed efficiently and at low cost.

Claims (7)

The low altitude excavator has an excavator body:
The excavator body
A tubing part for putting the excavation unit into the ground,
A horizontal frame for horizontally movable support of the excavating unit is installed on the tubing part,
In addition, lift mechanisms disposed on both left and right sides of this excavator body and
Equipped with a crane mechanism detachably mounted,
The lift mechanism has a reference position arranged in parallel with the horizontal frame on both left and right sides of the excavator body, and an extended position extending outward from both left and right sides of the excavator body,
At the extended position in which the lift mechanism extends outward from both left and right sides of the excavator main body and is disposed, the excavator main body is lifted up to a predetermined height,
The crane mechanism includes a crane support member and a slide beam,
The crane support member is rotatably attached to the excavator body,
The slide beam is attached to the crane support member, the chain block is slidably suspended, and a low-elevation excavator that rotates according to the rotation of the crane support member attached to the tubing part of the excavator body. The excavator body according to claim 1, wherein the excavator main body has a plurality of posts supporting the horizontal frame at a predetermined height on both left and right sides of the excavator main body, and the lift mechanism is attached to each post via a rotation mechanism. Low altitude excavator. The excavator according to claim 2, wherein the lift mechanism includes a hydraulic cylinder device having a rod that expands and contracts to a predetermined length, and the hydraulic cylinder device is attached to the post via a rotation mechanism. The excavator according to claim 2 or 3, wherein the rotation mechanism has a rotation shaft between the post and the lift mechanism, and is disposed in parallel with the horizontal frame on both left and right sides of the excavator body around the rotation axis. A low-hole head excavator, characterized in that the lift mechanism is rotated at a predetermined angle in the horizontal direction between the extended positions extending outward from the left and right sides of the main body. The low altitude excavator according to claim 1, wherein the excavator body is detachably mounted on the excavator body. The assembly method of the low-hole excavator
The lift mechanism installed in the excavator main body is placed on the ground by arranging the lift mechanism on the left and right sides of the excavator main body at the extended position extending outward from the reference position arranged parallel to the horizontal frame,
The excavator body mounted on the conveying vehicle is lifted up to float from the conveying vehicle, the conveying vehicle is separated from the excavator body supported on the ground, and a traveling body suspended and conveyed by a crane mechanism mounted on the excavator body is transferred to the excavator body. How to assemble a low altitude excavator that is mounted on the machine. The method of assembling a low altitude excavator according to claim 6, wherein the transport vehicle is separated from the excavator body, the excavator body is lifted down to a predetermined height, and the traveling body is mounted on the excavator body in that state. .

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