JPH11324550A - Drilling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling device having satisfactory workability and capable of excavating a rock bed efficiently. SOLUTION: This drilling device is provided with a tubing mechanism 1 which rotates a casing tube 10 and pushes it into the ground and a grip mechanism 15 which is hung down in the casing tube 10 by a wire rope 18 and is engaged with inner periphery of the casing tube 10. A drilling tool 30 is attached to the grip mechanism 15, the drilling tool 30 is provided with a cylindrical member 32 having a smaller outside diameter than an inside diameter of the casing tube 10, and drilling bits 34, 38 drilling along the inner periphery of the casing tube 10 are attached to the cylindrical member 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator for excavating rock using a casing tube.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 62-28591, a cutter is mounted on the inner wall at the lower end of a casing tube, and rock is excavated to a width that allows a shell of a hammer club to be inserted. There is known a method in which a bedrock remaining in a columnar shape by a hammer club is efficiently discharged, and the inner surface resistance of a casing tube during excavation is reduced.

As disclosed in Japanese Utility Model Laid-Open Publication No. 6-43090, a gripping mechanism engaged with the inner periphery of the casing tube is suspended in the casing tube by a wire rope, and a drill is attached to the gripping mechanism to form a casing tube. It is also known to drill by rotating a drill with rotation.

[0004]

However, in the former case, the cutter protrudes from the inner wall of the casing tube, so that the hammer club may interfere with the cutter. For example, there is often a relatively soft geological layer before reaching the bedrock by the formation.
In such a case, the preliminary excavation is performed by the hammer club, but there is a problem in workability that the preliminary excavation may not be performed due to the interference of the hammer club with the cutter. After the excavation is completed, the rebar cage is inserted into the casing tube, and then the casing tube is pulled out.However, at this time, there is a problem in workability that the cutter may be caught by the rebar cage and smooth pulling may not be performed. Was.

[0005] In the latter case, the bedrock in the casing tube is drilled by a drill, so that there is a problem in work efficiency. An object of the present invention is to provide an excavator capable of excavating a bedrock efficiently with good workability.

[0006]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, a tubing mechanism for rotating the casing tube and pushing it into the ground is provided, and a grip mechanism suspended in the casing tube by a wire rope and engaged with the inner periphery of the casing tube is provided. In the excavating apparatus, the excavating tool includes a tubular member having an outer diameter smaller than the inner diameter of the casing tube, and an excavating bit for excavating along the inner periphery of the casing tube is attached to the tubular member. A drilling rig characterized by the following.

The drilling tool may have a chuck claw for gripping the outer periphery of the columnar rock excavated by the drill bit. Further, the chuck pawl may be swingably supported, and may hold the outer periphery of the columnar rock by pulling up the wire rope.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a tubing mechanism, in which a lifting cylinder 4 for raising and lowering a lifting frame 3 is assembled on a base frame 2 held in a horizontal state, and a ring-shaped cylinder is mounted on the lifting frame 3 via a bearing 5. Are rotatably supported. A gear 7 is formed on the outer periphery of the rotating member 6, and a drive gear 8 a fixed to a rotating shaft of a hydraulic motor 8 provided on the elevating frame 3 is meshed with a gear 7 via an idle gear 9.
Is configured to rotate the rotating member 6 by the rotation of.

[0009] A tapered hole 11 is formed in the inner periphery of the rotating member 6 so that the casing tube 10 having a drill bit 10a attached to the lower end thereof can be inserted therein. It is formed so that. Above the rotating member 6, a bracket 1 which is raised and lowered by a chuck cylinder 12 disposed on the lifting frame 3.
3a, the bracket 13a and the rotating member 6 are provided.
And the rotating frame 13 through the bearing 13b.
c is supported and arranged to move up and down together with the bracket 13a. A wedge-shaped chuck member 14 suspended from the rotating frame 13c is inserted between the tapered hole 11 and the casing tube 10.

As shown in FIG. 2, a gripping mechanism 15 is suspended by a crane 16 in the casing tube 10. The gripping mechanism 15 is suspended by a wire rope 18 of the crane 16 via a swivel joint 17. Shaft 19, a hollow member 20 slidably mounted on the shaft 19 in a vertical direction, and a casing tube 1.
And a plurality of grip members 22 arranged along the inner periphery of the zero.

Upper flange 1 fixed to shaft 19
9a, a weight 23 is mounted on the shaft 19a.
A spring 24 is interposed between the hollow member 20 in a compressed state. Upper flange 19a and grip member 22
Are connected by a link 25 whose both ends are swingably supported so that the grip member 22 is expanded by the downward movement of the upper flange 19a. The hollow member 20 and the grip member 22 are connected by a pair of upper and lower links 26 and 27 such that the grip member 22 is expanded by moving the hollow member 20 upward.

At the lower end flange 20a of the hollow member 20,
An excavator 30 is attached. The drilling tool 30 is shown in FIG.
As shown in FIG. 2, a tubular member 32 is provided concentrically with the casing tube 10, and the outer diameter of the tubular member 32 is formed slightly smaller than the inner diameter of the casing tube 10. A first excavation bit 34 is attached to a lower end of the tubular member 32.

The holder member 3 is provided on the inner wall of the cylindrical member 32.
The holder member 36 has a second
A drill bit 38 is mounted. In the present embodiment, three second excavation bits 38 are mounted side by side on the holder member 36, and when the rock is excavated by the first and second excavation bits 34 and 38, the casing tube 10 It is configured such that a groove is excavated at a predetermined width from the inner wall of the inside to the inside. The size of the groove may be any size as long as a shell of a hammer club (not shown) can be inserted.

Next, the operation of the above-described excavator according to the present embodiment will be described. First, the casing tube 10 is inserted, and the chuck cylinder 12 is driven to lower the bracket 13a. Thereby, the bearing 13
b, The chuck member 14 is inserted between the tapered hole 11 and the casing tube 10 via the rotating frame 13c, and the rotating member 6 and the casing tube 10 are fastened by the chuck member 14.

Next, the hydraulic motor 8 is driven to rotate, and the rotary member 6 is rotated via the drive gear 8a and the idle gear 9, and the casing tube 10 is rotated with the rotation of the rotary member 6.
Is rotated. In addition, the elevating cylinder 4 is driven to lower the elevating frame 3, and the casing tube 10 is pushed into the ground via the rotating member 6, the chuck member 14, and the like.

When the casing tube 10 is rotated and pushed into the ground while excavating with the excavation bit 10a, earth and sand remain inside. The inner soil is the casing tube 1
The earth and sand are discharged out of the casing tube 10 by dropping the hammer club or the like into the inside of the casing tube 10. When excavating a relatively soft geological layer, even if it is preliminarily dug with a hamag lab,
It does not interfere with 0.

When the casing tube 10 reaches the bedrock, the gripping mechanism 15 is suspended by the wire rope 18 of the crane 16 and the excavator 30 is inserted into the casing tube 10. When the first excavation bit 34 hits the bottom, the shaft 19 descends together with the upper flange 19 a by the weight of the weight 23 and the urging force of the spring 24.
Further, the downward movement of the shaft 19 is a relatively upward movement of the hollow member 20. Thereby, the grip member 22 is expanded via the links 25, 26, and 27, and the grip member 22 is pressed against the inner periphery of the casing tube 10, so that the grip mechanism 15 and the casing tube 10 are engaged.

In this state, the casing tube 10 continues.
When is rotated, excavation is also performed by the first excavation bit 34 and the second excavation bit 38. First drill bit 34
And the second excavation bit 38, the bedrock is formed on the inner side from the inner wall of the casing tube 10 by the first excavation bit 34 and the second
Excavation is performed according to the excavation bit 38.

Therefore, the columnar rock 40 remains in the cylindrical member 32. When the height of the remaining columnar bedrock 40 reaches a predetermined height, the rotational drive of the casing tube 10 is stopped and the wire rope 18 is pulled up.
As a result, the grip member 22 is separated from the inner periphery of the casing tube 10 via the links 25, 26, and 27 to release the engagement.
0 is raised.

Next, when a hammer club (not shown) is dropped in the casing tube 10, the shell of the hammer club enters a circular groove excavated by the first excavation bit 34 and the second excavation bit 38, and the columnar rock 40 is removed. grab.
Then, when the hammer club is pulled up, the columnar rock 4
0 is broken by joints and the like, and is pulled out of the casing tube 10 together with the hammer club.

Then, the gripping mechanism 15 suspended by the wire rope 18 is lowered into the casing tube 10 again, and the excavation is continued as described above. After the excavation is completed, the grip mechanism 15 is pulled up, and the rebar cage is inserted into the casing tube 10. Thereafter, the casing tube 10 is pulled out by the tubing mechanism 1.

As described above, since the bedrock 40 can be discharged by using the hammer club, the excavation efficiency is improved, and even if the rebar cage is inserted into the casing tube 10, there is no protrusion on the inner wall of the casing tube 10. The casing tube 10 can be pulled out smoothly without being caught by the reinforcing bar.

Next, an excavator according to a second embodiment different from the above-described embodiment will be described with reference to FIG. still,
The same members as those in the above-described embodiment are denoted by the same reference numerals, and detailed description is omitted. In the second embodiment, a plurality of chuck claws 42 (only one is shown in the figure) are swingably supported inside the tubular member 32. Chuck claw 4
The tip of the chuck claw 42 is arranged such that its tip is opposed to the outer periphery of a columnar rock 40 remaining after the first and second drill bits 34 and 38 are drilled. Are configured to bite into the bedrock 40.

The other end of the chuck pawl 42 is pivotally connected to one end of a connecting link 44, and the other end of the connecting link 44 is swingably connected to the shaft 19. When the shaft 19 is pulled up, the chuck pawl 42 swings via the connection link 44 so that the rock 40 can be gripped by the chuck pawl 42.

Thus, the first excavation bit 34 and the second
When the wire rope 18 is pulled up after excavation to a predetermined depth by the excavation bit 38, the grip mechanism 15 is pulled up, and the chuck claws 42 are
Is rocked, and the chuck claws 42 bite into the bedrock 40.

When the wire rope 18 is further lifted, the rock 40 is broken by joints and the like, and the rock 40 is gripped by the chuck claws 42 and lifted together with the excavator 30. Then, the rock 40 is discharged to the outside of the casing tube 10 and the rock 40 can be discharged to the outside without using a hammer club or the like, and the excavation efficiency is improved.

The present invention is not limited to such an embodiment at all, and can be implemented in various modes without departing from the gist of the present invention.

[0028]

As described above in detail, the excavator according to the present invention can perform pre-digging with a hammer club, and can smoothly pull out the casing tube after inserting a reinforcing rod cage into the casing tube. In addition, there is an effect that the columnar rock can be discharged and excavated efficiently by the hammer grab.

By providing the chuck pawls, the excavation can be performed without using a hammer club, so that the excavation efficiency is further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an excavator as one embodiment of the present invention.

FIG. 2 is an overall view of the excavator according to the embodiment.

FIG. 3 is an enlarged sectional view of the digging tool of the present embodiment.

FIG. 4 is a sectional view of a main part of an excavator according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tubing mechanism 10 ... Casing tube 10a ... Excavation bit 15 ... Grip mechanism 16 ... Crane 18 ... Wire rope 19 ... Shaft 22 ... Grip member 30 ... Excavation tool 32 ... Cylindrical member 34 ... 1st excavation bit 36 ... Holder member 38 ... 2nd drill bit 40 ... rock 42 ... chuck claw

Claims (3)

[Claims] 1. A tubing mechanism for rotating a casing tube and pushing the casing tube into the ground, and a grip mechanism suspended in the casing tube by a wire rope and engaged with an inner periphery of the casing tube. A drilling tool, wherein the drilling tool includes a tubular member having an outer diameter smaller than the inner diameter of the casing tube, and a drilling bit that drills the tubular member along an inner periphery of the casing tube. A drilling rig characterized by being attached. 2. The excavator according to claim 1, wherein the excavator has a chuck claw for gripping an outer periphery of a columnar rock excavated by the excavation bit. 3. The chuck pawl is swingably supported,
The excavator according to claim 2, wherein the outer periphery of the columnar rock is gripped by pulling up the wire rope.