JPH10147931A - Inner excavation drilling machine of boring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner excavation drilling machine which can efficiently drill even hard ground with small vibration and noise. SOLUTION: This inner excavation drilling machine of boring machine is provided with a pipe 1, a grip device 4 provided on the base end side of the pipe 1 and fixing the pipe 1 so as to be coaxial against a casing tube 10, a cylindrical casing 5 provided on the extreme end of the pipe 1 coaxially and integratedly, a percussion drilling machine 6 provided inside the casing 5, an auger screw 7 provided on the outer circumferential face of the casing 5, and a plurality of drilling bits 8 fitted to the outer circumferential edge end of the auger screw 7 along the circumferential direction at regular intervals. Hereat, the grip device 4 is operated so as to fix the pipe 1 to the casing tube 10, and while the ground 100 is percussingly drilled by operating the percussion drilling machine 6, the casing tube 10 is rotated so as to spread the diameter of the ground 100 precedingly drilled by the percussion drilling machine 6 by the auger screw 7 and further drill the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring excavator for boring, and is particularly effective when applied to a cast-in-place pile for constructing a foundation pile.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a schematic structure of a conventional boring machine of an all-casing type applied to a cast-in-place pile for constructing a foundation pile.

[0003] As shown in FIG.
A traveling device 22 is provided. In front of the main body 21,
A pushing device 23 for pushing the casing tube 10 into the ground 100 while rotating the casing tube 10 is provided. As shown in FIG.
A plurality of upper casings 13 are connected to each other via a male joint 14 and a female joint 15.

[0004] A boom 24 is rotatably supported at a base end of the main body 21 so that a tip end of the boom 24 can swing along a vertical plane. A base end of a cylinder 25 whose tip is rotatably connected to the boom 24 is rotatably connected to an upper portion of the main body 21, and the boom 24 can be raised and lowered by expanding and contracting the cylinder 25. It has become.

A winch 26 around which a wire 28 is wound is provided on an upper portion of the main body 21. A pulley 27 for guiding a wire 28 from a winch 26 is provided at the tip of the boom 24. At the distal end of the wire 28, a digging excavator 30 provided with a grab 32 that can be opened and closed at the distal end of a grab bucket 31 is attached.

[0006] A case of performing a cast-in-place pile for constructing a foundation pile using such a boring machine will be described with reference to FIG.

While the casing tube 10 is pushed into the ground 100 while rotating by the pushing device 23, the winch 2
6, the boring excavator 30 is freely dropped into the casing tube 10 so that the grab 32 collides with the ground 100 in the tube 10 and the ground 100
Is crushed, and the resulting earth and sand is crushed by a grab 32 into a grab bucket 3.
When the excavator is taken into the inside 1, the excavator 30 is pulled up from the casing tube 10 by operating the winch 26, and the earth and sand is discharged from the grab bucket 31.

When the ground 100 is excavated to a predetermined depth by repeating the above steps, a reinforcing steel cage is put into the casing tube 10 and the tube 10 is gradually removed from the ground 100 while pouring ready-mixed concrete into the tube 10. By pulling out, a foundation pile is constructed on the ground 100.

[0009]

In the conventional all-casing boring machine described above, the excavator 30 is allowed to fall freely and the grab 32 collides with the ground 100 to crush and excavate the ground 100. Because of this, not only does the excavation efficiency drop significantly when the ground is hard such as rock, but also the vibration and noise are extremely large, so it could not be applied to construction in urban areas. .

[0010] In view of the above, an object of the present invention is to provide a boring machine for excavating a boring machine which has low vibration and noise and can efficiently excavate even on hard ground.

[0011]

In order to solve the above-mentioned problem, a boring machine according to the present invention is a boring machine for boring a boring machine for boring the inside of a casing tube which is pushed into the ground while being rotated. An excavator, a main body inserted into the casing tube, fixing means provided on a base end side of the main body, fixing the main body to the casing tube, and provided on a distal end side of the main body. And a percussion excavator provided on the main body so as to be able to excavate the ground on the tip side of the auger screw.

[0012] In the above-described boring machine, the excavating bit is provided at the outer peripheral edge of the auger screw.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a boring machine according to the present invention will be described below with reference to FIGS. FIG. 1 is a side view showing the schematic structure, and FIG. 2 is a sectional view of FIG. However, for members and the like that are the same as those described in the above-described conventional technology, the same reference numerals as those used in the above-described description of the conventional technology are used to omit the description.

As shown in FIGS. 1 and 2, a swivel joint 2 having a hanging piece 2a is connected to the base end of the pipe 1. The tip of the wire 28 described above is connected to the suspension piece 2a of the swivel joint 2 (not shown). That is, the pipe 1 is supported by the wire 28 via the suspension piece 2 a of the swivel joint 2.

As shown in FIGS. 1 and 2, the swivel joint 2 is connected to a hose 3 for supplying compressed air. A grip device 4 for positioning and fixing the pipe 1 so as to be coaxial with the casing tube 10 is provided on the outer peripheral surface near the base end of the pipe 1, and the grip device 4 is provided as shown in FIG. Has a simple structure.

In FIG. 2, 4a is a grip plate, 4b is a cylinder, 4c is a rod, 4d is a coil spring, 4e-4
h is a link plate.

A plurality of grip plates 4a are arranged along the circumferential direction so as to surround the pipe 1 in the circumferential direction, and the inner peripheral surface of the casing tube 10 is brought into contact with the inner peripheral surface of the casing tube 10. It has the same curvature as the peripheral surface. The cylinders 4b are respectively arranged on the back sides of the grip plates 4a along the axial direction of the pipe 1, so that compressed air is supplied into the cylinders 4b. Rod 4c
Is inserted into each of the cylinders 4b so as to be slidable along the axial direction, and can be projected from the cylinder 4b by feeding the compressed air into the cylinder 4b. The coil spring 4d is fitted to each of the rods 4c, and biases the rod 4c so as to retract the rod 4c into the cylinder 4b.

One end of the link plate 4e has a cylinder 4b.
And the other end is rotatably connected to the outer peripheral surface of the pipe 1. One end of the link plate 4f is rotatably connected to the base end of the cylinder 4b, and the other end is rotatably connected to the back surface of the grip plate 4a. One end of the link plate 4g is rotatably connected to the tip of the rod 4c, and the other end is rotatably connected to the outer peripheral surface of the pipe 1. One end of the link plate 4h is rotatably connected to the tip of the rod 4c, and the other end is rotatably connected to the back surface of the grip plate 4a.

That is, the grip device 4 is provided with each cylinder 4
When the compressed air is fed into the cylinder b, the rods 4c protrude from the cylinders 4b, respectively, and the grip plates 4a are moved to the outside in the radial direction of the pipe 1 by the torque mechanism by the link plates 4e to 4h with the same size. By pressing the grip plate 4a against the inner peripheral surface of the casing tube 10, the pipe 1 can be positioned and fixed so as to be coaxial with the casing tube 10, while being compressed into each cylinder 4b. When the supply of air is stopped, each rod 4c is retracted into the cylinder 4b by the urging force of the coil spring 4d, and each grip plate 4a is made equal inward in the radial direction of the pipe 1 by a torque mechanism by the link plates 4e to 4h. Move by the size, and the grip plate 4
By separating a from the inner peripheral surface of the casing tube 10, the pipe 1 can be opened from the casing tube 10.

On the other hand, as shown in FIGS. 1 and 2, a cylindrical casing 5 is integrally provided coaxially at the tip of the pipe 1. A percussion excavator 6 is provided inside the casing 5. The percussion excavator 6 has a proximal end connected to a distal end of the pipe 1 and a distal end protruding from the casing 5. That is, the impact excavator 5 can be operated by the compressed air sent from the hose 3 into the pipe 1.

As shown in FIGS. 1 and 2, on the outer peripheral surface of the casing 5, an auger screw 7 having a tapered spiral shape having a smaller outer diameter toward the tip end of the percussion excavator 6 is provided. A plurality of drill bits 8 are attached to the outer peripheral edge of the August screw 7 at predetermined intervals along the peripheral edge. Near the tip of the outer peripheral surface of the pipe 1,
A cylindrical hopper 9 for storing 01 is provided.

In this embodiment, the main body is constituted by the pipe 1, the swivel joint 2, the casing 5, and the like, and the fixing means is constituted by the grip device 4 and the like.

Next, a method of excavating the ground by the middle excavator having the above-described structure will be described.

When the excavator is lifted up through the wire 28 and inserted into the casing tube 10,
The pipe 1 is fixed to the casing 10 by feeding compressed air into the cylinder 4 a of the grip device 4.

Next, when the casing tube 10 is rotated and pushed into the ground 100 while supplying compressed air, the impact excavator 6 strikes and excavates the ground 100, and the rotational force of the casing tube 10 is reduced by the gripping device. 4
And the pipe 1 is transmitted to the casing 5, and the auger screw 7 rotates with the rotation of the casing 5,
At the same time, the hole in the ground 100 previously excavated by the impact excavator 6 is excavated so as to expand the diameter, and at the same time, the earth and sand 101 generated by the excavation is transported upward and sequentially sent into the hopper 9.

The ground 100 is excavated in this way, and when the soil 101 in the hopper 9 becomes full, the rotation of the casing tube 10 and the supply of compressed air are stopped, and the excavation is temporarily stopped. Then, the fixation by the grip device 4 to the casing 10 is released, the excavator is lifted up via the wire 28, taken out of the casing tube 10, and the soil 101 in the hopper 9 is discharged.

After the earth and sand 101 in the hopper 9 have been discharged in this way, the excavator is lifted up through the wire 28 and inserted into the casing tube 10 again, and the same operation as described above is repeated. By going, the ground 100 can be excavated to a predetermined depth.

Therefore, the following hardening can be obtained by such a boring excavator of a boring machine. Since it is not necessary to crush the ground 100 due to the impact of free fall, vibration and noise can be significantly reduced, and the invention can be applied to construction in an urban area or the like. Since the ground 100 is further excavated with the August Cru 7 while being excavated with the percussion excavator 6, it can be efficiently excavated even on a hard ground such as a bedrock.
Since the drill bit 8 is attached to the auger screw 7, it is possible to drill even reinforced concrete.

[0029]

According to the middle excavator of the boring machine of the present invention, vibration and noise can be greatly suppressed, and excavation can be performed efficiently even on hard ground.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic structure of a boring machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a schematic structural view of a boring machine provided with a conventional excavator.

FIG. 4 is a cross-sectional view illustrating a structure of a casing tube.

FIG. 5 is an explanatory view of a conventional excavation method using a boring machine provided with a middle excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Swivel joint 2a Suspension piece 3 Hose 4 Grip device 4a Grip plate 4b Cylinder 4c Rod 4d Coil spring 4e-4h Link plate 5 Casing 6 Striking excavator 7 August crush 8 Drilling bit 9 Hopper 10 Casing tube 100 Ground 101 Earth and sand

Claims (2)

[Claims] 1. A boring machine for excavating the inside of a casing tube that is pushed into the ground while being rotated, comprising: a main body inserted into the casing tube; and a base end side of the main body. A fixing means for fixing the main body to the casing tube, an auger screw provided at a distal end side of the main body, and an auger screw provided at the main body so as to be able to excavate the ground at the distal end side of the auger screw. A boring machine having a percussion excavator. 2. The boring machine according to claim 1, wherein a drill bit is provided at an outer peripheral edge of the auger screw.