JPS59141686A - Drilling apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Subject of invention/field of industrial application) INDUSTRIAL APPLICABILITY The present invention is used in the field of improving foundation soil.

The present invention relates to an apparatus for excavating a hole when constructing a pile of concrete or the like in the ground, and is particularly suitable for excavating when rocks or forebottoms are present in the ground. An outer tube having a plurality of through holes and a middle tube fitted into the outer tube and having a screw on the outer periphery are connected to each other so as to be rotatable in the elevator frame, and an inner tube is connected to the elevator frame so as to be rotatable. This invention relates to an excavation device that has a pipe inserted through it and an air hammer attached to the lower end of the pipe.

(Prior art) Earth augers are generally used to drill holes in the ground, but conventional earth augers do not have any special crushing means other than the auger head at the tip of the auger screw, so When a hole or forebottom exists, it is difficult to excavate the hole using the auger screw, and the drilling efficiency is greatly reduced.

(Object of the Invention) In view of the above, the present invention makes it possible to easily crush rocks and forebottoms in the ground when drilling a hole in the ground, thereby improving the efficiency of the excavation work, as well as being noiseless and An object of the present invention is to provide a drilling device that can perform excavation work without vibration.

(Structure of the Invention) To achieve the above object, the excavation equipment of the present invention has an elevator frame that is suspended along a leader so as to be able to rise and fall freely, and has a screw on the outer periphery and a plurality of through holes at required locations. An outer tube and a middle tube fitted into the outer tube and having a screw on the outer periphery are connected to each other so as to be rotatable, and an inner tube whose inside is an air supply path is inserted into the middle tube. An air hammer 7 is attached to the lower end protruding from the lower end of the middle pipe, a driving means for rotating the outer pipe and the middle pipe is provided within the elevator frame, and an air hammer operating means is provided at the upper end of the inner pipe. It is connected to an air supply pipe.

Example Next, one embodiment of the present invention will be described based on the drawings.

Figure 1 shows the overall view of the excavation equipment. An outer tube 3 with a screw 2 threaded over the entire length of the outer tube 3, and a screw 4 fitted into the outer tube 3 over the entire length of the outer periphery.
The inner tubes 5 are connected to each other so as to be rotatable, and an inner tube 6 having an air supply passage 6a inside is loosely inserted into the inner tube 5. An air hammer 7 is attached to the lower end of the inner tube 6 protruding from the lower end, and a drive device 8 for rotating the outer tube 3 and a drive device 9 for rotating the middle tube 5 are provided within the elevator frame 1.
An air supply pipe 10 for operating the air hammer is connected to the upper end of the inner tube 6. In addition, the outer pipe 3 has a plurality of through holes 11 for use with earth and sand, crushed rock pieces, etc. throughout the outer pipe 3.
- Arranged at appropriate intervals.

To explain the above structure in more detail, the outer tube rotation drive device 8 rotatably supports a large gear 12 at the lower part of the elevator frame 1, and the lower end of the large gear 12 is concentric with the upper end of the outer tube 3. While integrally connected, a pair of electric motors 13 with reduction gears are provided at positions corresponding to both sides of the large gear 12 within the machine frame 1.
13 are installed, and the 4jj power axis of these electric motors 13.13-
A small gear 15.15 fixed to 14, 14 is fitted to a large gear 12 at opposing positions on both sides, and the small gear 15
, 15, the outer tube 3 is rotated via the large gear 12. The inner tube 5 extends beyond the upper end of the outer tube 3 to the center of the machine frame 1, and a bearing 17 is interposed between the flange member 16 fixed to the inner tube 5 and the machine frame 1. Furthermore, it is rotatably held by a bearing 18 provided in the Daio-January 2. The drive device 9 for rotating the middle tube 5 has a large gear 19 fixed to the upper end of the middle tube 5, and a row of electric motors 20 with reducers arranged on both sides of the middle tube 5 in the machine frame 1. .20 is installed, and these electric motors 20
．． The small gears 22.22 fixed to the output shafts 21.21 of 20 are meshed with the man gear 19 at opposing positions on both sides, and the small gears 22, 22 are rotated by the rotation of the electric motors 20.20 in the same direction. , the middle tube 5 is rotated via a large gear 19. As shown in FIG. A ring-shaped elastic member 25 or a coil spring or the like is interposed between the upper end and the upper end. Further, the inlet portion of the air supply path 6a of the inner tube 6 and the air supply pipe 10 are connected by a connector 26.

As shown in FIGS. 3 to 6, the air hammer 7 has a body 28 having a sliding chamber 27 and connected to the lower θ111 of the inner pipe 6.
It consists of a piston 30 having a pressure chamber 29 and reciprocating within the sliding chamber 27 of the body 27, and a head plate 31 attached to the tip of the piston 30. Pressure air from the inlet hole 32 of the body 28
A, the air is introduced into the introduction passage 32, passes through a plurality of communication passages 33 extending in the axial direction, and enters the annular intermediate chamber 34, and the pressurized air from this intermediate chamber 34 is introduced into the sliding chamber 27 and the piston 30.
The piston 30 enters the annular variable volume chamber 35 between the
It enters the pressure chamber 29 through a plurality of communication holes 36 provided in the pressure chamber 29 . At this time, due to the difference in pressure receiving area between the annular variable volume chamber 35 side and the pressure chamber 29 side, the screw cylinder 30 having a large pressure receiving area is driven downward with respect to FIG. When the pressure air in the pressure chamber 29 reaches the annular outlet side chamber 37 on the lower end side of the body 28 , the pressure air in the pressure chamber 29 passes through the plurality of exhaust passages 38 extending in the axial direction of the body 28 from the communication hole 36 and the outlet side chamber 37 to the body 28 . It is released into the atmosphere from the upper end surface side, thereby reducing the air pressure in the pressure chamber 29, while the piston 30 is pushed upward by the pressure air in the variable volume chamber 35, and the same operation as described above is repeated at high speed. This causes the piston 30 to perform high-speed vertical reciprocating motion, that is, vertical forced vibration. still,
The head plate 31 is screwed onto the tip of the piston 30 with a screw 39, and a cutter 40 is attached to the head plate 1-31.
is the provision.

When operating the excavation equipment having the above-mentioned configuration, the elevator frame 1 of this equipment is suspended from the top of the league (not shown) at an appropriate height (E), and the drive devices 8 and 9 are operated to remove it. The tube 3 is moved in the downward feeding direction of the screw 2 (
In addition, the inner tube 5 is rotated in the opposite direction to the outer tube 3, that is, in the upward feeding direction of the screw 4, and the air hammer 7 is operated to forcibly vibrate the head plate 31 up and down. As the wire (not shown) is fed out, the air hammer 7 at the tip crushes the rock in the ground or the forebottom, and the outer tube 3 forms an excavation hole.The air hammer 7 crushes the rock. The crushed pieces, earth and sand, etc. are pushed upward by the screw 4 of the middle pipe 5 rotating in the upward feeding direction within the outer pipe 3. It is pushed out and discharged, and is pressed against the wall surface of the hole formed in the outer tube 3. After the hole has reached the required depth and the earth, sand, rocks, etc. inside the outer tube 3 have been discharged, the direction of rotation of the inner tube 5 remains the same as when drilling the outer tube 3 as described above. While rotating the screw 2 in the upward feeding direction (pulling direction), the outer tube 3, the middle tube 5, and the inner tube 6 are pulled out from the holes formed while raising the machine frame 1. go. still,
At the time of this pulling out, the operation of the air hammer 7 is stopped.

Also, at this time, the 50 rotations of the inner tube may be stopped. and outer tube 3
After completing the extraction, ready-mixed concrete, mortar, etc. are poured into the hole to create the so-called piles at the location tJ. Alternatively, prefabricated piles may be buried in this excavated hole.

In the above-described embodiment, the screw is provided along the entire length of the outer tube, but the screw may be provided at least at the lower end of the outer tube. Further, in the embodiment, the outer tube and the middle tube are rotated by separate drive devices, but the outer tube and the middle tube may be appropriately rotated by a single drive device.

(Results of the Invention) The excavation device of the present invention includes an outer pipe, a middle pipe, and an inner pipe, and an air hammer is attached to the lower end of the inner pipe.
It can easily crush and crush rocks in the ground, forebottoms, etc. that cannot be sufficiently crushed with conventional earth augers, greatly improving drilling efficiency. In addition, the outer and middle pipes have screws and a through-hole in the outer pipe, making it possible to perform hole drilling and earth removal work effectively.
Since rocks, etc. can be pushed out of the outer pipe through the through-hole and brought into pressure contact with the inner wall of the hole, the burden of disposal of soil removed from the ground is reduced, and the wall of the excavation hole is strengthened. This can be done to prevent collapse of the pores. Furthermore, the device of the present invention is advantageously equipped with only a rotary drive means, and the air hammer is attached to the lower end of the inner pipe so that the working pressure air is supplied through the inner pipe, so that the excavation work can be easily carried out. There is little risk of generating noise and vibration on the ground.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal sectional front view showing an embodiment of the drilling equipment of the present invention, Fig. 2 is an enlarged sectional view taken along the line n-II of Fig. 1, Fig. 3 is an enlarged sectional view of the air hammer, and Fig. 4 is an enlarged sectional view of the air hammer. IV- in Figure 3
5 is a sectional view taken along the line IV, and FIG. 5 is a sectional view taken along the line V-V in FIG.
The figure is a sectional view taken along the line Vl--Vl in FIG. 3. 1... Elevator frame, 2... Screw, 3... Outer pipe, 4... Screw, 5... Middle pipe, 6... Inner pipe,
7...Air hammer, 8...Outer tube rotation drive device, 9.
... Middle tube rotation drive device, 10 ... Air supply pipe, 1
1...through window. Figure 1 Figure 2 Figure 3 @ 4 Figure 5 Figure □ 3rd 35

Claims (1)

[Claims] An elevator frame that is suspended along a leader so that it can be raised and lowered is equipped with an outer tube that has screws on its outer periphery and a plurality of through holes arranged at required locations, and an outer tube that is fitted into the outer tube and has screws on its outer periphery. The inner tubes having the inner tubes are connected to each other so as to be rotatable, and an inner tube whose inside is an air supply path is inserted into the inner tube, and an air hammer is attached to the lower end portion of the inner tube that protrudes from the lower end of the inner tube. J.2 An excavation device comprising a driving means for rotating an outer tube and an inner tube within the elevator frame, and a pipe for supplying air for operating an air hammer connected to the upper end of the inner tube.