JP4526085B2 - Underground pile cutting equipment - Google Patents

Description

  The present invention relates to a cutting device that is used when a pile buried in the ground is cut from the top and pulled up to be removed.

  Concrete piles buried in concrete foundations need to be removed after destroying and removing the structure. A concrete underground pile is buried by arranging a plurality of reinforcing bars embedded in the longitudinal direction of the pile in an annular shape. Therefore, the underground pile can be cut by excavating from the outer periphery to the depth where the reinforcing bar is buried and cutting the reinforcing bar.

  As an apparatus for cutting such concrete underground piles, FIGS. 2 and 3 of Patent Document 1 show a plurality of cutters having different projecting widths on the inner periphery of the lower part of the casing driven to rotate by a casing driver. Disclosed is a material that is distributed in the circumferential direction at a certain location and rotates the casing, thereby excavating and crushing the pile from the top to make concrete scrap.

  Further, in FIGS. 5 to 9 of Patent Document 1, a plurality of cutters are arranged in the circumferential direction so as to be able to project and retract by a hydraulic cylinder attached to the lower part of the casing toward the inside of the casing. A method is disclosed in which a pile is cut and pulled up every cut portion by rotating the casing while protruding inward by a hydraulic cylinder.

  Further, in Patent Document 2, a cutting device is suspended in a casing by a crane via a wire rope, and this cutting device has a chuck device at the upper part thereof, and is opened and closed by a bucket and a hydraulic cylinder provided in the bucket at the lower part. When a pile is cut, the cutting device is fixed to the inner wall of the casing by a chuck device, and the pile is cut by holding the pile with the opening and closing shell and rotating the opening and closing shell together with the casing. Then, the thing which cancels | releases fixation to the casing of the cutting device by a chuck device, and pulls up the pile cut | disconnected with the cutting device with the crane is disclosed.

JP-A-8-120670 JP 2001-323767 A

  As FIG. 2 and FIG. 3 of patent document 1 show, the thing which crushes all concrete piles from the top part has many cut volumes of a pile, and its efficiency is bad.

  In addition, as shown in FIGS. 5 to 9 of Patent Document 1, in a case where a plurality of cutters are mounted in a casing so as to be able to protrude inward by a hydraulic cylinder, the casing is excavated to a predetermined depth. In order to cut the cutter by inwardly projecting inward with the hydraulic cylinder and rotating the cutter together with the casing to cut into the depth of the reinforcing bar embedded part of the pile, the hydraulic cylinder has a stroke to reach the reinforcing bar embedded part. What you have is necessary. For this reason, in order to ensure a stroke, the hydraulic cylinder needs to have a predetermined length, the diameter of the casing has to be increased, and there is a problem that it is difficult to cut a large-diameter pile.

  On the other hand, since the thing of patent document 2 has a bucket upper frame part in the upper part of an opening-and-closing shell, the length which can cut a pile is determined by the height difference from the upper frame part to the excavation blade of an opening-and-closing shell. Therefore, there is a problem that the pile cannot be removed efficiently. Moreover, since it is necessary to insert the bucket which accommodates a hydraulic cylinder between the inner surface of a casing, and the outer surface of a pile, there exists a problem of receiving the restriction | limiting of the diameter of the pile which can be cut | disconnected.

  In view of the above-described problems, the present invention provides an underground pile cutting device that can efficiently remove a pile without any limitation on the cutting length of the pile and can cut a pile having a relatively large diameter. For the purpose.

The underground pile cutting device according to claim 1, a casing driver,
A casing that is rotationally driven by the casing driver;
A plurality of excavated bodies that are attached to the inner wall of the casing so as to be openable and closable, have a horizontal cross-sectional shape of an arc, and have excavation claws on the lower side,
Wherein mounted on each of the upper vertical drilling bodies in the inner wall of the casing, both Ru and a hydraulic cylinder for opening and closing the corresponding drilling member,
The hydraulic pressure source of the hydraulic cylinder is installed on the top of the casing or on the ground, and a hydraulic pipe that connects between the hydraulic pressure source and the hydraulic cylinder is provided along the inner wall of the casing. The upper part of the excavated body has an open structure .

The underground pile cutting device according to claim 2, wherein the underground pile cutting device according to claim 1,
The casing has a plurality of excavation claws at the lower end, and the excavation claws are arranged at different mounting positions so that the excavated earth and sand are pushed out of the casing when excavating by rotating the casing. It is characterized by that.

The underground pile cutting device according to claim 3 is the underground pile cutting device according to claim 1 or 2,
The excavation body is characterized in that a projecting width inward of the casing in an opened state is set smaller than a projecting width inward of the casing of the hydraulic cylinder.

The underground pile cutting device according to claim 4, wherein the underground pile cutting device according to any one of claims 1 to 3,
The casing has a plurality of excavation claws at a lower end thereof, and a protruding width of the excavating claws into the casing is set larger than a protruding width of the hydraulic cylinder into the casing.

The underground pile cutting device according to claim 5, wherein the underground pile cutting device according to any one of claims 1 to 4,
The casing has a ring projecting inwardly at a lower end thereof, a pocket portion for storing excavated earth and sand is formed between the ring and the excavated body, and an inlet for introducing excavated earth and sand into the pocket portion is formed in the ring. Is provided.

The underground pile cutting device according to claim 6 is an underground pile cutting device according to claim 5,
The lid for closing the introduction port is detachably provided.

The underground pile cutting device according to claim 7, wherein the underground pile cutting device according to any one of claims 1 to 6,
A hydraulic pressure source for operating the hydraulic cylinder is detachably installed on the top of the casing, and a hydraulic pipe connecting the hydraulic pressure source and the hydraulic cylinder is disposed on the inner periphery of the casing. It is characterized by that.

The cutting device for underground piles according to claim 8 is the cutting device for underground piles according to any one of claims 1 to 6 ,
An elevating frame is installed on the stationary part of the casing driver or on the ground, a revolving body is installed on the elevating frame so as to be able to swivel, and a work table on which a hydraulic pressure source for operating the hydraulic cylinder is mounted on the revolving body In addition, a chuck device for gripping the casing is provided on the revolving structure.

  According to the first aspect of the present invention, a hydraulic cylinder is mounted vertically on the inner wall of the casing, and an excavating body having an arc-shaped horizontal cross section is mounted by the hydraulic cylinder, and the excavating body is operated in a closing direction together with the casing. Since the excavation body is driven to rotate and the pile is excavated, the upper space of the excavation body can be an open structure, and the length of cutting the pile is not limited. Therefore, the pile can be cut to a length corresponding to the weight that can be lifted by a crane or the like that lifts the cut pile, and the pile can be removed efficiently.

  Further, as described above, a drive unit that opens and closes an excavated body is required as compared with a bucket having an open / close shell attached thereto or a hydraulic cylinder directed inward of the casing and a cutter attached to the inner end thereof. The width is narrow and it is possible to cut a pile having a relatively large diameter.

  According to the invention of claim 2, the casing has a plurality of excavation claws at the lower end, and the excavation claws are arranged at different mounting positions so that the excavation earth and sand are pushed out of the casing during excavation. The earth and sand can be excavated while being compacted to the outer wall side of the casing, and the earth and sand filled between the excavated body and the pile does not become an obstacle to the pile cutting, and the pile can be cut efficiently.

  According to the invention of claim 3, the excavating body is set so that the projecting width inward of the casing in the opened state is smaller than the projecting width inward of the casing of the hydraulic cylinder. Since it does not protrude inward of the casing than the hydraulic cylinder required for the opening and closing drive, the diameter of the pile that can be taken in between them in the open state of the pair of excavated bodies is not limited by the structure of the excavated bodies, It is possible to cut a pile having a large diameter by effectively using the diameter of the casing including the hydraulic cylinder. In addition, since a space can be secured between the pile and the casing, the excavation body can be easily inserted between the pile and the casing.

  According to invention of Claim 4, it has several excavation nail | claws in the lower end of the casing, The protrusion width | variety of the excavation nail | claw inward of the casing was set larger than the protrusion width | variety inward of the casing of the said hydraulic cylinder. As a result, the degree of contact between the hydraulic cylinder and the excavated ground is reduced, and the damage can be prevented.

  According to the invention of claim 5, the casing has a ring projecting inwardly at a lower end thereof, and a pocket portion for storing excavated sediment is formed between the ring and the excavating blade, and the excavated sediment is stored in the ring. Since the introduction port to be introduced into the pocket part is provided, when excavating the bottom of a concrete building, concrete excavation waste that cannot be compacted to the casing outer wall side is introduced and stored in the pocket part from the introduction port. Therefore, excavation waste does not interfere with excavation, and the concrete bottom can be excavated smoothly.

  According to the sixth aspect of the invention, the casing can be used for both concrete excavation and general ground excavation by attaching and detaching the lid to the introduction portion.

  According to invention of Claim 7, the hydraulic pressure source which operates a hydraulic cylinder is installed in the top part of the said casing so that attachment or detachment is possible, The hydraulic piping which connects the said hydraulic pressure source and the said hydraulic cylinder, Since it is disposed on the inner periphery of the casing, a swivel joint when the hydraulic pressure source is installed on the ground is not necessary, and the casing can be easily attached and detached.

  According to the invention of claim 8, the swiveling body is installed so as to be able to turn on the stationary part of the casing driver or the lifting frame installed on the ground, and the hydraulic pressure source for operating the hydraulic cylinder is mounted on the turning body. Since the revolving unit is provided with a chuck device for gripping the casing, it is not necessary to remove the hydraulic pressure source from the casing by raising and lowering the lifting frame when adding the casing, Casing addition work is facilitated, and the efficiency of cutting work of piles can be increased.

  FIG. 1 is a side view showing an embodiment of an underground pile cutting apparatus according to the present invention. 1 is a cutting device, and 2 is a phase crane that performs auxiliary work of this excavator. The cutting device 1 includes a casing driver 3 and a casing 5 to which a device for excavating around the pile 4 and cutting the pile 4 is rotated and driven by the casing driver 3. 6 is a work table on which a hydraulic pressure source 7 of a hydraulic cylinder 23 (see FIG. 4) described later is mounted.

  2 and 3 are a side view and a plan view showing an example of the casing driver 3, respectively. The casing driver 3 has guide posts 11 erected at four corners on a base frame 10 installed horizontally by a hydraulic cylinder 9, and an elevating frame 13 that is moved up and down by the hydraulic cylinder 12 along these guide posts 11. Install. A rotating body 15 that is rotationally driven by a hydraulic motor 14 via a gear mechanism (not shown) is installed on the lifting frame 13. The rotating body 15 has a cylindrical shape through which the casing 5 can be inserted. The rotating body 15 includes a chuck device 19 having a movable band 17 that is opened and closed by a hydraulic cylinder 16.

  FIG. 4 is a longitudinal sectional view showing a main part of the cutting apparatus of the present invention. Reference numerals 20 denote excavating bodies provided in pairs, and these excavating bodies 20 are attached so as to be openable and closable around a shaft 21 fixed to the lower portion of the casing 5 as shown in FIG. A pair of these excavated bodies 20 is preferably provided, but three excavators 20 may be provided. As shown in FIG. 5, these excavated bodies 20 have an arcuate horizontal cross-sectional shape and have excavation claws 22 on the lower side.

Reference numeral 23 denotes a hydraulic cylinder provided corresponding to the excavated body 20. These hydraulic cylinders 23 are connected to the upper part of the excavated body 20 on the inner wall of the casing 5 by pins 24 and are mounted vertically. The piston rods of these hydraulic cylinders 23 and the excavation body 20 are connected via a link 25. The link 25 protects the piston rod of the hydraulic cylinder 23 when the earth and sand enter, and prevents the rotational force of the casing 5 from being applied directly to the hydraulic cylinder 23 via the excavating body 20, thereby distributing the force. is there.

  As shown in FIGS. 6 and 7, a protective cover 27 covering the hydraulic cylinder 23 is provided on the inner wall of the casing 5 so as to cover the piston rod even when the hydraulic cylinder 23 is fully extended. Provided.

  As shown in FIG. 6, the excavated body 20 has a protruding width W <b> 1 inward of the casing in the opened state smaller than a protruding width W <b> 2 inward of the casing including the protective cover 27 of the hydraulic cylinder (W <b> 2). > W1).

  As shown in FIGS. 4 and 8, a casing front end portion 5 </ b> A, to which a plurality of excavation claws 30 are attached, is detachably attached to the lower end of the casing 5 with bolts (not shown). The casing tip 5A is exchangeable between a case where the object to be excavated is a general ground and a case where it is a concrete bottom as shown in FIGS. In addition, it is possible to replace the pile 4 with one having the excavation claw 30 having a different excavation inner diameter so that the diameter of the pile 4 can be changed.

  Although these excavation claws 30 are adjacent to each other and are attached at different positions in the radial direction of the casing 5, as shown by an arrow 29, when excavation is performed by rotating the casing 5 in the normal rotation direction, 5 is configured to be extruded to the outside of 5 and consolidated on the outer wall side of the casing 5 to be accumulated. In the present embodiment, the excavation claw 30 is divided into three groups 31, 32, 33, and in each group, the starting end in the rotational direction during excavation is on the innermost side of the casing 5, and the end is on the outermost side. It is arranged.

  As shown in FIG. 4, the protrusion width W <b> 3 of the innermost excavation claw 30 of the casing 5 toward the inside of the casing is larger than the protrusion width W <b> 2 of the casing 5 including the protective cover 27 of the hydraulic cylinder 23 ( W3> W2) is set.

  As shown in FIGS. 4 and 8, the casing 5 has a ring 34 projecting inwardly at a lower end thereof, and a pocket portion 35 is formed between the ring 34 and the excavation body 20.

  As shown in FIGS. 1, 9, and 10, the work table 6 on which the hydraulic pressure source 7 of the hydraulic cylinder 23 is installed has a structure that is detachably fitted to the upper end of the casing 5. The hydraulic pressure source 7 is composed of an engine and a hydraulic pump. The hydraulic pressure source 7 includes a wireless receiver, a control valve that operates according to the received signal, and a wireless controller 37 that controls the start and stop of the engine. The worktable 6 can be climbed by a worker, and the wireless control device 37 is configured to be operated by a worker on the worktable 6.

  As shown in FIGS. 4 and 7, the piping that supplies the hydraulic fluid from the hydraulic pressure source 7 to the hydraulic cylinder 23 is an arc-shaped piping that is arranged in an arc along the inner wall of the casing 5 from the top of the hydraulic cylinder 23. 40, which is disposed vertically along the inner wall of the casing 5 and has the same length as the length of the casing 5 for addition, and is connected to the hydraulic pressure source 7 by a joint 43 and a pipe 43 which is joined by a joint 41. And a piping 44.

The process of cutting the pile 4 using this apparatus is as follows.
Existing pile head search (1-1) Excavate the relevant part with a hydraulic excavator, etc., check the position of the pile head of the existing pile 4 to be removed and backfill.
(1-2) At this time, a relief core is installed so that the pile core of the existing pile 4 can be restored.
Full swivel casing driver installation The full swivel casing driver 3 is installed according to the pile core of the existing pile 4 restored from the escape core.
This device (casing) is built in the casing driver 3.
This apparatus (casing) rotational press-fit The casing driver 3 rotationally presses this apparatus (casing) to the target cutting depth of the existing pile 4.
Existing pile cutting The excavated body 20 of this apparatus is closed while rotating the casing 5, and the existing pile 4 is cut.
Cutting an existing pile with a wedge or the like If the pile is not sufficiently cut in the above-described cutting step, the wedge or the like is put into the casing 5 and the casing 5 is rotated, and the existing pile 4 is folded at the cutting point.
Removal of the cut pile The cut pile is gripped with a hammaglab and removed.
Casing extension The casing 5 is added.
Repeat Steps (4) to (8) above are repeated until all of the existing piles are removed.

In the above process, specific excavation and the like are performed as follows. The casing 5 is suspended by the crane 2 shown in FIG. 1, the casing 5 is inserted into the casing driver 3, the casing 5 is chucked by the chuck device 19, the hydraulic motor 14 is rotated, and the hydraulic cylinder 9 is contracted simultaneously. Then, excavation around the pile 4 is performed while pushing the lifting frame 13 down. During the excavation, the hydraulic pressure source 7 rotates with the casing 5. When the excavation depth reaches a predetermined depth, the casing 5 is rotated while the hydraulic cylinder 23 is extended and the excavation body 20 is closed. As shown in FIG. Over depth. After the internal rebar is cut from the outer periphery of the pile 4 by this work, the hydraulic cylinder 23 is contracted so that the excavated body 20 is opened as shown in FIG. Here, when the cutting of the pile 4 is insufficient, the wedge 4 is put between the casing 5 and the pile 4 and the casing 5 is rotated to fold the pile 4 at the cutting point.

  Thereafter, the crane 2 shown in FIG. 1 is used to support the hummaglab 45 by the wire ropes 46 and 47 as shown in FIG. 11, and the cut pile 4A is gripped by the hammaglab 45 and pulled up to the ground. Then, the same operation as described above is performed while the casing 5 is added. When the casing 5 is added, the work table 6 on which the hydraulic pressure source 7 and the wireless control device 37 are mounted is removed from the top of the casing 5 by the crane 2. Instead, the casing 5 is added by the crane 2. It is suspended and the casing 5 and the vertical pipe 42 are added. Thereafter, the work table 6 is mounted on the casing 5 again.

  In this way, this underground pile cutting device is attached to the inner wall of the casing 5 with the hydraulic cylinder 23 in the vertical direction, and attached with the excavating body 20 whose horizontal sectional shape opened and closed by the hydraulic cylinder 23 is arcuate, Since the excavating body 20 is operated in the closing direction and the excavating body 20 is rotationally driven together with the casing 5 to excavate the pile 4, the upper space of the excavating body 20 can be an open structure, and the pile 4 is cut. There is no restriction on the length to be. Accordingly, the cut pile 4A can be cut to a length corresponding to the load limit weight of the crane 2 or the like that lifts the pile 4A, and the pile removal operation can be performed efficiently.

  Further, as compared with a conventional case where a bucket is attached with an open / close shell or a case where a hydraulic cylinder is directed inward of the casing and a cutter is attached to the inner end thereof, the occupation of the drive unit for opening and closing the excavated body 20 is occupied. The width can be narrow and the pile 4 having a relatively large diameter can be cut.

  Further, in the present embodiment, the excavating body 20 sets the projecting width W1 inward of the casing in the opened state to be equal to or smaller than the projecting width W2 of the hydraulic cylinder 23 from the casing 5 inward. Since the body 20 does not protrude inward of the casing 5 from the hydraulic cylinder 23 that is structurally necessary for opening and closing the drive, the diameter of the pile 4 that can be captured between the pair of excavated bodies 20 in the open state is that of the excavated body 20. Without being limited by the structure or the like, it is possible to cut the pile 4 having a large diameter by effectively using the diameter of the casing 5 including the hydraulic cylinder 23. In addition, since a space can be secured between the pile 4 and the casing 5, it is easy to insert the excavated body 20 between the pile 4 and the casing 5.

  Further, in the present embodiment, the plurality of excavation claws 30 at the lower end of the casing 5 are arranged at different positions so that the excavation earth and sand are pushed out of the casing 5 during excavation. 5 can be excavated while being compacted to the outer wall side, and excavated earth and sand are filled between the excavated body 20 and the pile 4 so that the pile 4 can be cut efficiently without interfering with the cutting of the pile 4. The

  In the present embodiment, the inward protrusion width W3 of the excavation claw 30 is set to be larger than the inward protrusion width W2 of the casing 5 of the hydraulic cylinder 23. The degree of contact with the excavated ground is reduced and the damage can be prevented.

  Further, in the present embodiment, the hydraulic pressure source 7 for operating the hydraulic cylinder 23 is detachably installed on the top of the casing 5, and the hydraulic pipe 40 connecting the hydraulic pressure source 7 and the hydraulic cylinder 23, Since 42 is disposed along the inner wall of the casing 5, a swivel joint is not required when the hydraulic pressure source 7 is installed on the ground, and the hydraulic piping can be easily attached and detached when the casing is added. However, when implementing this invention, the structure using a swivel joint is also employable.

  FIG. 12 is a bottom view of a casing showing another embodiment of the present invention, and FIGS. 13 and 14 are partial views of the lower end portion of the casing as seen from the inside. In this embodiment, the ring 34 is provided with a plurality of earth and sand inlets 50, and the inlets 50 can be closed by a lid 52 that is detachably attached by bolts 51 as shown in FIG. It is. 53 is a stopper that prevents the excavation debris 55 accumulated in the pocket portion 35 from falling from the introduction port 50, and 54 is a protruding piece provided to project obliquely downward from the introduction port 50 in order to scoop up the excavation debris into the pocket portion 35. It is.

  This embodiment is suitable for excavating the bottom of a concrete building having a thickness of about 1 m. In this bottom plate, since the concrete excavation waste generated by excavation by the casing 5 is hard, it becomes difficult to consolidate the excavation waste between the casing 5 and the inner wall of the excavated hole, and the excavation waste becomes an obstacle to the excavation. In order to prevent such a situation from occurring and enable smooth excavation, as shown in FIG. 13, when the bottom plate is excavated by the excavation claw 30 by rotating the casing 5, the excavation debris 55 is introduced into the inlet. From 50, it protrudes through the projecting piece 54 to the pocket portion 35, and is stopped by a stopper 53 and stored. In general excavation of the ground, as shown in FIG. 14, the excavated soil is consolidated and accumulated on the outer wall side of the casing 5 by attaching and closing a lid 52 with a bolt 51. As described above, the casing 5 can be used for both concrete excavation and general ground excavation by attaching and detaching the lid 52 to the introduction portion 50.

  FIG. 15 is a longitudinal sectional view showing another example of the mounting structure of the hydraulic pressure source 7 in the present invention. In this embodiment, an elevating frame 61 that is raised and lowered by a hydraulic cylinder 60 is installed in a stationary part such as a guide post 11 of the casing driver 3, and a revolving body that can turn via a bearing 62 on the elevating frame 61. 63, a work table 6 on which the hydraulic pressure source 7 for operating the hydraulic cylinder 23 is mounted is installed on the swivel body 63, and a chuck device 64 for gripping the casing 5 is provided on the swivel body 63. It is.

  In this embodiment, when the casing 5 is rotated to perform ground cutting around the pile 4 or cutting of the pile 4, the casing 5 is gripped by the chuck device 64 and the work table 6 is rotated together with the casing 5. .

  After adding a new casing 5, the chuck device 64 is opened to release the chuck of the casing 5, the hydraulic cylinder 60 is extended, the chuck of the casing 5 by the chuck device 19 of the casing driver 3 is released, and the hydraulic cylinder 12 is released. And the chuck is again chucked by the chuck devices 19 and 64 to perform excavation of the ground and excavation of the pile 4.

  According to this embodiment, when the casing 5 is added, it is not necessary to remove the work table 6 on which the hydraulic pressure source 7 is mounted from the casing 5 by moving the lifting frame 61 up and down. The work can be performed efficiently, and the pile 4 can be cut efficiently. The hydraulic cylinder 60 and the lifting frame 61 may be supported on the ground around the casing driver 3.

It is a side view which shows the cutting device of an underground pile by this invention in a working state with a phase crane. It is a side view of the casing driver of this Embodiment. It is a top view of the casing driver of FIG. It is a longitudinal cross-sectional view which abbreviate | omits a casing driver and shows the cutting device of this Embodiment. It is an AA expanded sectional view of FIG. It is a principal part expanded sectional view of FIG. It is BB expanded sectional drawing of FIG. It is a bottom view of the casing of FIG. It is a top view of the worktable of this Embodiment. It is a longitudinal cross-sectional view of the workbench of FIG. It is a longitudinal cross-sectional view which shows the working state by the cutting device of this Embodiment. It is a bottom view which shows the other example of the casing by this invention. It is the figure which looked at the casing of FIG. 12 from the inner side. In FIG. 13, it is a figure which shows the state which closed the earth and sand introduction port with the lid | cover when excavating general ground. It is a longitudinal cross-sectional view which shows the other example of the hydraulic pressure source mounting worktable by this invention.

Explanation of symbols

1: Cutting device, 2: Crane, 3: Casing driver, 4, 4A: Pile, 5: Casing, 6: Work table, 7: Hydraulic source, 9: Hydraulic cylinder, 10: Base frame, 11: Guide post , 12: hydraulic cylinder, 13: lifting frame, 14: hydraulic motor, 15: rotating body, 16: hydraulic cylinder, 17: movable band, 19: chuck device, 20: excavated body, 21: shaft, 22: Drilling claws, 23: hydraulic cylinders, 24: pins, 25: links, 27: protective covers, 30: drilling claws, 31, 32, 33: drilling claw groups, 34: rings, 35: pockets, 37: wireless control Device: 40: Arc-shaped piping, 41: Joint, 42: Vertical piping, 43: Joint, 44: Piping, 45: Hanmaglab, 46, 47: Wire rope, 50: Inlet, 51: Bolt, 52: Lid, 53: Stopper, 5 : Projecting piece, 55: cuttings, 60: hydraulic cylinder, 61: lift frame, 62: Bearing. 63: Revolving body, 64: Chuck device

Claims (8)

A casing driver;
A casing that is rotationally driven by the casing driver;
A plurality of excavated bodies that are attached to the inner wall of the casing so as to be openable and closable, have a horizontal cross-sectional shape of an arc, and have excavation claws on the lower side,
Mounted on each of the upper vertical of the drill body on the inner wall of the casing, Rutotomoni a hydraulic cylinder for opening and closing the corresponding drilling member,
The hydraulic pressure source of the hydraulic cylinder is installed on the top of the casing or on the ground, and a hydraulic pipe that connects between the hydraulic pressure source and the hydraulic cylinder is provided along the inner wall of the casing. An underground pile cutting device characterized in that the upper part of the excavated body has an open structure . In the underground pile cutting device according to claim 1,
The casing has a plurality of excavation claws at the lower end, and the excavation claws are arranged at different mounting positions so that the excavated earth and sand are pushed out of the casing when excavating by rotating the casing. An underground pile cutting device characterized by that. In the underground pile cutting device according to claim 1 or 2,
The excavating body has an underground projecting width in an opened state set smaller than an inward projecting width of the hydraulic cylinder casing. In the underground pile cutting device according to any one of claims 1 to 3,
The casing has a plurality of excavation claws at the lower end thereof, and the projecting width of the excavation claws into the casing is set larger than the projecting width of the hydraulic cylinder into the casing. Pile cutting device. In the underground pile cutting device according to any one of claims 1 to 4,
The casing has a ring projecting inwardly at a lower end thereof, a pocket portion for storing excavated earth and sand is formed between the ring and the excavated body, and an inlet for introducing excavated earth and sand into the pocket portion is formed in the ring. An underground pile cutting device characterized by comprising In the underground pile cutting device according to claim 5,
An underground pile cutting device, wherein a lid for closing the introduction port is detachably provided. In the underground pile cutting device according to any one of claims 1 to 6,
A hydraulic pressure source for operating the hydraulic cylinder is detachably installed on the top of the casing, and a hydraulic pipe connecting the hydraulic pressure source and the hydraulic cylinder is disposed on the inner periphery of the casing. An underground pile cutting device characterized by that. In the underground pile cutting device according to any one of claims 1 to 6 ,
An elevating frame is installed on the stationary part of the casing driver or on the ground, a revolving body is installed on the elevating frame so as to be able to turn, and a work table on which a hydraulic pressure source for operating the hydraulic cylinder is mounted is installed on the revolving body In addition, a cutting device for underground piles, wherein a chuck device for holding the casing is provided on the revolving structure.

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