JP2941662B2 - All casing excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped middle boring excavator for an all-casing excavator used for excavating a shaft, forming a foundation pile, and the like.

[0002]

2. Description of the Related Art Referring to FIG. 7, a conventional all-casing excavator used for excavating a shaft or forming a foundation pile will be described with reference to FIG. The casing tube 2 is pushed into the ground while being rotated or rocked to excavate a ring-shaped hole, and the excavated hole wall is maintained by the casing tube 2 while the excavation bucket 3 is moved up and down by the wire.
Further, the tip of the excavation bucket 3 is opened and closed to excavate and discharge earth and sand in the casing tube 2 to form a shaft.

[0003]

The conventional all-casing excavator shown in FIG. 7 can excavate even a complicated stratum or a solid rock, but when excavating a solid rock,
The cutter bit attached to the tip of the casing tube 2 is damaged and worn out at an early stage.
Only about m can be excavated.

The excavation bucket 3 can excavate and excavate soil and sand effectively, but excavation efficiency is very poor for rock, and the casing tube 2 excavates the rock about 5 to 30 cm per hour. However, the excavation bucket 3 has a problem that only about half of the rock can be excavated in a ring shape. The present invention is proposed in view of the above-mentioned problems, and its object is to provide an all-casing that can efficiently excavate even a solid rock mass and can achieve both a reduction in construction time and a reduction in construction cost. An object of the present invention is to provide a ring-shaped inside excavator for an excavator.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to excavating earth and sand inside a casing tube by pushing the casing tube into the ground while rotating or swinging the casing tube, and excavating a hole wall. In an all-casing excavator that maintains the
A ring-shaped underground excavator for excavating earth and sand in the casing tube, a connection table that can be raised and lowered, and a plurality of outer mounting tables attached at a small diameter position or a large diameter position on the outer peripheral lower surface of the connection table. An inner mounting base mounted on the lower surface of the center of the connecting base, and an inner mounting base attached to each of the outer mounting bases so as to be capable of expanding and contracting radially inward and outward, and extending radially outward to the inner surface of the casing tube. A gripper device to be pressed, a percussion crusher attached to the lower end of each of the outer mounting base and the inner mounting base, and a lower end of each outer mounting base when each of the outer mounting bases is mounted at a small diameter position of the connecting base. A small-diameter connecting member for connecting the parts, a large-diameter connecting member for connecting the lower end of each of the outer mounting bases when each of the outer mounting bases is mounted at a large-diameter position of the connecting base, and each of the connecting members The lower surface and above It is constituted by a cutter bit attached to the lower end of the side connecting mount.

[0006]

The ring-shaped middle excavator of the all-casing excavator according to the present invention is constructed as described above, and the outer mounting bases are mounted at the large-diameter position (or the small-diameter position) of the connecting base. The lower end of the mounting base is connected by a large-diameter connecting member (or a small-diameter connecting member), and then the gripper device is actuated by fluid pressure to fix the ring-shaped boring excavator to the casing tube, and then the casing tube Rotating or rocking the ring-shaped digging excavator and pushing it into the ground, the fluid-driven operation of the crushing and impacting machine attached to the lower end of the inner mounting base and the rotational movement of the cutter bit make a ring-shaped hole in the center. , While hydraulically operating a percussion crusher attached to the lower end of each outer mounting base, and cutters attached to the lower surface of the large diameter connection material (or small diameter connection material) The rotational movement of the bets drilling ring hole of large diameter (or small diameter) around the ring-shaped hole in the central portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a ring-shaped hollow excavator of an all-casing excavator according to the present invention will be described with reference to an embodiment shown in FIGS. 1 to 6. FIG. 2, the left part from the center line of FIG. 2 shows a state where it is assembled and excavated to a small diameter, the right part of FIG. 2 shows a state where it is assembled and excavated to a large diameter, and FIG. FIG. 4 shows the bottom surface along the line AA in FIG.
FIG. 5 shows a cross-sectional plane along the line BB in FIG. 2, and FIGS. 5 and 6 show a construction state.

3 and 4, the left side from the center line shows a state in which a small diameter is assembled and excavated, and the right side shows a state in which the large diameter is assembled and excavated. As shown in FIG. 1, the present ring-shaped middle excavation digging apparatus includes a connecting stand 8 which can be moved up and down, and a plurality of outer mounting bases attached by bolts at a small diameter position or a large diameter position on the lower surface of an outer peripheral portion of the connecting table 8. 6, an inner mount 7 attached to the lower surface of the central part of the connecting base 8 by bolts, and a radially outward extending attached to the outer mounts 6 so as to be able to expand and contract radially inward and outward. Sometimes, the gripper inner cylinder 1 of the gripper device 4 is pressed against the inner surface of the casing tube 2 (see FIG. 2).
1, a percussion crusher 5 attached to the lower end of each of the outer mounting bases 6 and the inner mounting base 7, and the outer mounting bases when each of the outer mounting bases 6 is mounted at the small diameter position of the connecting base 8. 6 and a large-diameter connection member that connects the lower end portions of the outer mounting bases 6 when the outer mounting bases 6 are mounted at the large-diameter positions of the connecting bases 8. And a cutter bit 16 attached to the lower surfaces of the connecting members 14 and 15 and the lower end of the inner connecting mount.

FIGS. 2 to 6 show the above-mentioned ring-shaped hollow excavation apparatus.
More specifically, as shown in FIG. 2, a swivel joint 9 is attached to the upper surface of the connection stand 8, and the swivel joint 9 is supplied with fluid pressure (air pressure or liquid pressure) from the ground. Is attached. The gripper device 4 includes a gripper inner cylinder 11 that is pressed against the inner surface of the casing tube 2.
When the gripper cylinder 12 is operated in the extension direction, the gripper inner cylinder 11 is pressed against the inner surface of the casing tube 2 and when the gripper cylinder 12 is operated in the contraction direction, The gripper inner cylinder 11 is separated from the inner surface of the casing tube 2.

FIG. 3 is a cross-sectional bottom view taken along the line AA of FIG. 2, and the left side from the center line shows a state in which a small diameter is assembled and excavated, and the right side is a large diameter. The figure shows the state of assembling and excavating, 5 is a percussion crusher, 6 is an outer diameter side mounting base, 7 is an inner diameter side mounting base, and 14 on the right side of the center line is each outer diameter side mounting when excavating a large diameter. A large-diameter connecting member connecting the bases 6 and a small-diameter connecting member 15 connecting the outer-diameter-side mounting bases 6 at the time of small-diameter excavation to the left of the center line. It is changed to change the excavation diameter. A cutter bit 16 is attached to these connecting members 14 and 15 and the inside mount 7.

FIG. 4 is a cross-sectional plan view taken along the line BB of FIG. 1, showing a state where the left side from the center line is assembled and excavated into a small diameter, and the right side is a large diameter part. This shows a state of assembling and excavating the casing tube 2.
Gripper inner cylinder 10 pressed into contact with the inner surface of the outer peripheral side mounting base 6 incorporating the gripper inner cylinder 10,
Are connected to the connecting table 8 by bolts.

Next, FIGS. 5 and 6 show the construction of the ring-shaped ring-shaped digging apparatus for an all-casing excavator according to the present invention.
This will be described below. Reference numeral 17 in FIG. 5 shows a state of the ring-shaped middle digging excavator at the time of large-diameter excavation. At this time, each outer mounting base 6 is mounted at the large diameter position of the connecting base 8, and the lower end of each outer mounting base 6 is connected by the large diameter connecting member 14.

Next, the fluid pressure (air pressure or hydraulic pressure) is changed to an air compressor or a hydraulic unit (not shown) on the ground.
The flexible hose 10 extending downward through the flexible hose support 19 is supplied to the ring-shaped digging excavator 17 via the swivel joint 9 and the outer mounting base 6
The gripper inner cylinders 11 of the respective gripper devices 4 provided in the above are operated radially outward, and each of the gripper inner cylinders 11 is pressed against the inner surface of the casing tube 2 to form the ring-shaped middle boring excavator 1
7 is fixed to the casing tube 2.

Next, the capped casing tube 2 and the ring-shaped digging digging device 17 are pushed into the ground while being rotated or rocked by an all-casing digging machine (1 in FIG. 7) installed on the ground, and While the ring-shaped hole is excavated at the center by the operation of the crushing and hitting machine 5 attached to the lower end by the fluid pressure and the rotational movement of the cutter bit 16, the fluid of the hitting and crushing machine 5 attached to the lower end of each outer mounting base 6. A large-diameter ring-shaped hole is excavated around the center-shaped ring-shaped hole by the operation by pressure and the rotational movement of the cutter bit 16 attached to the lower surface of the large-diameter connecting member 14.

Reference numeral 18 in FIG. 6 shows a state of the ring-shaped middle digging excavator at the time of excavation of a small diameter. At this time, each outer mounting base 6 is attached to the small-diameter position of the connecting base 8, and the lower end of each outer mounting base 6 is connected by the small-diameter connecting member 15. Next, a fluid pressure (air pressure or hydraulic pressure) is applied to an air compressor or hydraulic unit (not shown) on the ground → a flexible hose 10 extending downward via a flexible hose support 19 → a ring-shaped boring excavator 18 via a swivel joint 9 The gripper inner cylinder 11 of each gripper device 4 provided on each outer mounting base 6 is operated radially outward, and each gripper inner cylinder 11 is moved to the casing tube 2.
To fix the ring-shaped hollow excavator 18 to the casing tube 2.

Next, the all-casing excavator (see 1 in FIG. 7) installed on the ground pushes the capped casing tube 2 and the ring-shaped digging excavator 18 into the ground while rotating or swinging the same, and pushes the inner mounting base 7. While the ring-shaped hole is excavated at the center by the operation of the crushing and hitting machine 5 attached to the lower end by the fluid pressure and the rotational movement of the cutter bit 16, the fluid of the hitting and crushing machine 5 attached to the lower end of each outer mounting base 6. By the action of pressure and the rotational movement of the cutter bit 16 attached to the lower surface of the small-diameter coupling member 15, a small-diameter ring-shaped hole is excavated around the central ring-shaped hole.

[0017]

As described above, the ring-shaped inside excavator of the all-casing excavator according to the present invention mounts each of the outer mounting bases at the large-diameter position (or the small-diameter position) of the connecting base as described above. The lower end is connected by a connecting member for a large diameter (or a connecting member for a small diameter), and then the gripper device is operated by fluid pressure to fix the ring-shaped hollow excavating device to the casing tube, and then to the casing tube and the ring-shaped Rotate or swing the boring excavator and push it into the ground to excavate a ring-shaped hole in the center by operating the crushing and hitting machine attached to the lower end of the inner mounting base by fluid pressure and rotating the cutter bit. On the other hand, the operation of the impact crusher mounted on the lower end of each outer mounting base by fluid pressure and the rotation of the cutter bit mounted on the lower surface of the large-diameter connection material (or the small-diameter connection material) The drilling of large (or small) ring holes around the ring hole in the center part by the movement allows efficient drilling even on solid rock, shortening construction time and reducing construction cost. Can be achieved together.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a ring-shaped middle digging excavator of an all-casing excavator of the present invention.

FIG. 2 is a vertical sectional side view showing a state where the part on the left side from the center line in the figure is being assembled into a small diameter and excavating, and a part on the right side from the center line in the figure is being assembled into a large diameter and excavating. It is.

FIG. 3 is a bottom view taken along line AA of FIG. 2;

FIG. 4 is a cross-sectional plan view taken along the line BB in FIG. 2;

FIG. 5 is an explanatory diagram showing a construction state at the time of large-diameter excavation.

FIG. 6 is an explanatory diagram showing a construction state at the time of excavation of a small diameter.

FIG. 7 is a vertical sectional side view showing a conventional all-casing excavator.

[Explanation of symbols]

 2 Casing tube 4 Gripper device 5 Impact crusher 6 Outer mount 7 Inner mount 8 Connecting stand 14 Large diameter connecting material 15 Small diameter connecting material 16 Cutter bit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21B 7/20 E21B 4/16 E21B 4/18

Claims (1)

(57) [Claims] 1. An all-casing excavator for excavating earth and sand inside a casing tube by pushing the casing tube into the ground while rotating or swinging the casing tube and maintaining the excavated hole wall with the casing tube. A ring-shaped underground excavator for excavating the like, a vertically movable connecting table, a plurality of outer mounting tables mounted at a small diameter position or a large diameter position on the outer peripheral lower surface of the connecting table, and a center of the connecting table. An inner mounting base attached to the lower surface of the outer casing, and a gripper device attached to each of the outer mounting bases so as to be able to expand and contract inward and outward in the radial direction and press against the inner surface of the casing tube when extending outward in the radial direction. The impact crusher attached to the lower end of each of the outer mounting base and the inner mounting base, and each of the outer mounting bases are mounted at the small diameter position of the connecting base. At the time of attachment, a connecting member for small diameter connecting the lower end of each outer mounting base, and a large diameter connecting the lower end of each outer mounting base when each outer mounting base is mounted at a large diameter position of the connecting base. An all-casing excavator comprising: a connecting member for use; and a cutter bit attached to a lower surface of each of the connecting members and a lower end of the inner connecting mount.