JPH06257363A - Drilling device - Google Patents

Abstract

PURPOSE:To prevent dispersion of moved earth drilled by means of a drilling device, and improve the strength of drilling members. CONSTITUTION:A cylindrical member 20 covering the outer circumference of the upper part of a casing 6 concentrically provided to an auger screw 5 is fixed on the non-rotation part of a driving device 4, an inner discharge port 6b is provided on the upper part 6a of the casing 6, and an outer discharge port 20a is provided on the cylindrical member 20. Removed earth is discharged from the inner discharge port 6b of the casing 6a into the cylindrical member 20, and further discharged from the outer discharge port 20a in a decided direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driver for driving auger screws as first piercing members and casings as second piercing members, respectively, for rotationally driving vertical holes in the ground. The present invention relates to a drilling device, and more particularly to a drilling device having means suitable for preventing scattering of discharged excavated soil.

[0002]

2. Description of the Related Art When constructing an underground structure, earth retaining sheet piles and H-shaped steel are sometimes buried in the ground. In such a case, at the work site where the ground is hard or pile driving by a pile driver that prohibits vibration or noise is prohibited, a vertical hole is dug using an auger screw, etc. H-shaped steel is pushed in and buried.
Also, when a pile with a relatively small diameter is placed underground, concrete may be placed by drilling a vertical hole with an auger screw.

FIG. 6 shows a general structure of a boring device 1 for boring a vertical hole using the auger screw as described above.
In FIG. 6, a driving device 4 is attached to a leader 3 standing upright on the front surface of the pile driving machine 2 so as to be able to move up and down. Driven. The driving device 4 has an auger screw 5 and a cylindrical casing 6 that surrounds the outer periphery of the auger screw 5 and is coaxially fitted. The auger screw 5 is rotatably driven by driving means such as a hydraulic motor. Further, a plurality of discharge ports 7 for discharging excavated earth and sand are provided on the outer peripheral surface of the casing 6.

When the ground 8 is drilled by the punching device constructed as described above, the drive device 4 is lowered while rotating the auger screw 5 and the casing 6, and the ground is cut at the tip of the auger screw 5 and the casing 6. The ground 8 is excavated and the excavated earth and sand is discharged from a plurality of discharge ports 7 provided on the outer peripheral surface of the casing 6 to perforate the ground 8.

Although the punching device 1 is provided with the casing 6, a steel pipe pile may be used in place of the casing 6 when constructing the foundation pile. In this case, while drilling the ground 8 with the auger screw 5, the steel pipe pile is rotated and inserted into the ground 8 as in the case of the casing 6, and after the drilling, only the auger screw 5 is removed.
The steel pipe pile is left as it is in the ground 8 as a foundation pile.

[0006]

However, according to the conventional punching device configured as described above, the casing 6
When is rotated, the discharge port 7 is also rotated, and the excavated earth and sand discharged from the discharge port 7 is scattered in any direction. As a result, there is a problem that the reader 3 and the main body of the pile driver 2 are soiled, and if there are buildings in the vicinity, the excavated earth and sand affect them.

The discharge port 7 may be provided only on the upper part of the casing 6, but as shown in the figure, the discharge port 7 is provided at a plurality of axial positions to reduce the drop height of the excavated soil. Then, since many openings are formed in the casing 6, there is also a problem that the strength of the casing 6 is reduced.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a drilling device capable of preventing the discharged excavated soil from scattering and improving the strength of a drilling member such as a casing. To aim.

[0009]

In order to achieve the above object, the punching device of the present invention is a screw-shaped first drilling device that is independently driven to rotate by a driving device that is moved up and down along a leader of a pile driver. And a cylindrical second perforating member, wherein the perforating members are concentrically arranged, and an internal discharge port for discharging excavated earth and sand is provided at an upper portion of the second perforating member. A cylindrical member having an external discharge port for discharging the excavated earth and sand discharged from the internal discharge port to the outside is fixedly provided to the non-rotating portion of the drive device. In the present invention, it is preferable that a plurality of the internal discharge ports are arranged in the circumferential direction. In addition, an earth discharge tube for guiding the discharge of the excavated earth and sand may be connected to the external discharge port of the tubular member. Further, it is preferable that the mounting position of the tubular member with respect to the mounting body in the circumferential direction is variable. Furthermore, the perforation apparatus of the present invention can be applied to the case where the second perforation member is a steel pipe pile left in the ground after construction.

[0010]

In the boring device of the present invention, the soil excavated by the first and second boring members rises in the cylindrical second boring member by the rotation of the screw-shaped first boring member, The second perforated member is once discharged into the tubular member through the internal discharge port. After that, it is discharged without scattering from the external discharge port provided in the cylindrical member fixed to the non-rotating portion of the drive device. By disposing a plurality of internal discharge ports in the circumferential direction, at least one internal discharge port faces the external discharge port, and soil is smoothly discharged. If the earth discharge tube is provided at the external discharge port, the excavated earth and sand is discharged by being guided by the earth discharge tube, and thus the scattering of the excavated earth and sand can be further prevented. By changing the mounting position of the tubular member in the circumferential direction with respect to the non-rotating portion of the drive device, the direction of the external discharge port can be changed according to the surrounding conditions. When constructing a steel pipe pile as a foundation pile, the same effect can be obtained by using the steel pipe pile as the second punching device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the punching device of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. In these figures, parts corresponding to those of the conventional example shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. 1 is a partial cross-sectional front view showing a main part of a punching device according to this embodiment, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, and FIG.
It is a side view which shows the state which attaches the punching device 1 of FIG.

1 to 3, a drive device 4 is an auger drive device 11 for rotationally driving an auger screw 5 as a first perforating member and a casing drive device 12 for rotationally driving a casing 6 as a second perforating member. And is guided by the reader 3 and can move up and down. The auger drive device 11 is provided with a hydraulic motor 13 that rotationally drives the auger screw 5, and the casing drive device 12 is provided with a hydraulic motor 14 that rotationally drives the casing 6. And hydraulic motors 13, 1
4 is fixed to a bracket 15 which is guided by the reader 3 and moves up and down.
6 is attached. A gear 18 is rotatably supported on the gear case 16 via a bearing 17,
The auger screw 5 coaxially penetrates through a through hole 18 a formed in the center of the gear 18. In addition, the hydraulic motor 14
A gear 19 that meshes with the gear 18 is attached to the rotary shaft 14a.

A cylindrical casing 6a having a reduced diameter is coaxially fixed to the lower end surface of the gear 18, and a casing 6 having a predetermined outer diameter is fixed to the lower end surface of the casing 6a. The auger screw 5 is a casing 6a,
The center of 6 is rotatably penetrated. Also gear case 1
A cylindrical tubular member 20 is concentrically fixed to the lower end surface of 6, and the lower end surface of the tubular member 20 has casings 6 and 6a.
Is slidable with respect to the upper surface of the flange 6b that connects the.

An external discharge port 20a is formed by cutting out a part of the outer circumference of the tubular member 20 as shown in FIG. 3, and three internal discharge ports are formed on the outer circumference of the reduced diameter casing 6a. 6b is formed by notching in the circumferential direction at equal intervals. A cover 21 bent downward by 90 degrees is attached to the outside of the external discharge port 20a. Further, a plurality of, for example, 16 mounting holes 20c are formed in the flange portion 20b for mounting the tubular member 20 on the lower end surface of the gear case 16 in the circumferential direction, and the tubular member 20 is mounted in the mounting hole 20c. The screw 22 inserted into the gear box 16 fixes it to the lower end surface of the gear box 16.

Next, the operation of the punching device of this embodiment constructed as described above will be described. The excavated soil excavated by the auger screw 5 and the casing 6 is guided to the inside of the casing 6 by the spiral blade formed on the auger screw 5 and guided to the inside of the reduced diameter casing 6a. The excavated earth and sand are discharged into the tubular member 20 through the internal discharge port 6b that rotates with the casing 6a, and then discharged from the external discharge port 20a of the cylindrical member 20 through the cover 21 in a fixed direction.

According to the present embodiment, the tubular member 20 is fixed to the bracket 15 of the drive unit 4 via the gear box 16 and does not rotate, so that the excavated earth and sand is discharged in a fixed direction and is not scattered. . Further, since the casing 6a is formed with a plurality of internal outlets 6b, at least one internal outlet 6b faces the external outlet 20a,
The earth removal can be performed smoothly and the earth removal efficiency can be improved. Furthermore, since the tubular member 20 is attached to the gear box 16 with the screw 22 through the multiple attachment holes 20c, by shifting the attachment holes 20c and attaching it,
The direction of the external discharge port 20a can be shifted within the pitch range of the mounting holes 20c, and the discharge direction can be set to a certain degree.

Further, as shown in FIG. 5, by connecting the soil discharge tube 23 as a guide member to the open end of the cover 21, it is possible to more reliably prevent the excavated soil from scattering. Furthermore, since the excavated earth and sand discharge port is not formed in the casing 6, the strength of the casing 6 can be improved. It should be noted that the numbers of the internal discharge ports 6b and the mounting holes 20c of the tubular member 20 shown in the above embodiment are merely examples, and are not limited to those numbers. The same effect can be obtained when a steel pipe pile serving as a foundation pile is used instead of the casing 6. Further, the present invention can be applied to a case where screw blades are provided on the inner circumference or the outer circumference of the casing 6.

[0018]

According to the first aspect of the present invention, the drilled earth and sand is discharged in a fixed direction from the external discharge port of the fixed cylindrical member, so that scattering is prevented and the adverse effect of the excavated earth and sand on the surroundings is reduced. be able to. In addition, since no internal discharge port for discharging excavated earth and sand is provided except for the upper end of the second piercing member,
The strength of the second piercing member can be improved.

According to the second aspect, since a plurality of internal discharge ports are arranged in the circumferential direction, the excavated earth and sand can be efficiently discharged.

According to the third aspect, since the earth discharge tube is connected to the external discharge port, it is possible to more reliably prevent the excavated earth and sand from scattering.

According to the fourth aspect, since the mounting position of the tubular member in the circumferential direction can be changed, the direction of the excavated earth and sand discharged from the external discharge port can be changed, and the excavated earth and sand deposit portion can be moved. You can

According to the fifth aspect, even when a steel pipe pile as a foundation pile is used instead of the second drilling member, it is possible to prevent the excavated soil from scattering.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing the configuration of a main part of an embodiment of a punching device of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a side view showing a state in which the punching device of FIG. 1 is attached to a pile driver to perform a punching operation.

FIG. 5 is a side view showing a state in which an earth discharging tube according to another embodiment of the present invention is attached.

FIG. 6 is a side view showing a state in which an example of a conventional punching device is attached to a pile driver to perform a punching operation.

[Explanation of symbols]

 1 Punching Device 4 Driving Device 5 Auger Screw (First Punching Member) 6 Casing (Second Punching Member) 6b Internal Discharge Port 8 Ground 20 Cylindrical Member 20a External Discharge Port 21 Cover 23 Discharge Tube

Claims (5)

[Claims] 1. A screw-shaped first piercing member and a cylindrical second piercing member, which are independently driven to rotate by a driving device that is moved up and down along a leader of a pile driver,
In the punching device in which these punching members are concentrically arranged, an internal discharge port for discharging the excavated soil is provided on the upper part of the second punched member, and the excavated soil discharged from the internal discharge port is discharged to the outside. A punching device, wherein a cylindrical member having an external discharge port is fixedly provided on a non-rotating portion of a drive device. 2. The punching device according to claim 1, wherein a plurality of the internal discharge ports are arranged in the circumferential direction. 3. The punching device according to claim 1, wherein an earth discharging tube for guiding the discharge of the excavated earth and sand is connected to an external discharging port of the tubular member. 4. The punching device according to claim 1, wherein a mounting position of the tubular member with respect to a non-rotating portion of the driving device in the circumferential direction is variable. 5. The punching device according to claim 1, wherein a steel pipe pile left in the ground after construction is used instead of the second punching member.