JPH0579792B2 - - Google Patents

Description

[Detailed Description of the Invention] "Field of Industrial Application" The present invention relates to a method and apparatus for drilling small diameter holes suitable for various types of ground used for diagonal pile anchor work in expanded base excavation for steel tower foundation work, etc. .

"Conventional Technology" Hitherto, the mainstream of large steel tower foundations has been expanded-bottomed foundations, and when excavating the expanded-bottomed portions, diagonal pile anchor work is performed to support the collapse of the ground. In the slanted pile anchor work, holes are manually drilled using an auger drill with a bit attached to the tip for soil layers, and a rock drill for rock layers, depending on the soil type.

``Problems to be solved by the invention'' In conventional slanted pile anchor construction, drilling is done manually, which is extremely hard work and also causes vibrations, dust, and
The drawback is that the working environment, such as noise, is extremely poor.
In addition, in terms of workability, clay may stick to the auger in clayey soil layers, making it difficult for the soil to be removed to keep up with the amount of excavation, or the air blow-off hole drilled in the bit at the tip in the direction of excavation may be clogged with clay, etc. This method has the disadvantage that the soil becomes clogged and stagnates around the bit and rod (power transmission shaft), increasing the rotational resistance of the bit and rod, making it impossible to drill holes.

In order to efficiently drill through sand and gravel layers, it is necessary to apply rotation and impact to the tip of the bit at the same time, so the structure of the bit must also be suitable for this purpose, but conventional auger drills only use rotation. The rock drill is suitable for drilling in clay and sand layers, and the rock drill mainly uses impact force to make it suitable for drilling in bedrock layers.
It is designed to rotate in one direction by the up and down movement of the panma piston, and the rotational force is small, so it takes a very long time to drill holes in sand and gravel layers.

Furthermore, when rocks and soil are in alternating layers,
When drilling through a rock layer and entering a soil layer, the amount of excavation becomes so large that drilling becomes impossible due to the same phenomenon as in the case of the cohesive soil layer. In addition, small pieces of rock generated when drilling through a rock layer get caught on the shoulder of the bit (at the rear of the outer diameter part), making it difficult to pull out.

The conventional method involves manual drilling, and since the rod diameter is much smaller than the drilled hole diameter, there is a drawback that the center of the hole inevitably shifts, and when there are cracks in the rock or rocks overlap, etc. After drilling a hole to a predetermined depth, when pulling out the bit and rod, the center of the hole is shifted, so the shoulder of the bit hits the edge of the rock, requiring a strong pulling force.

``Means for Solving the Problems'' The present invention has been made to solve the above problems.The rod is a spiral rod inserted into a casing pipe, and the bit at the tip of the rod is used to drill holes in various types of ground. The bit at the tip of the rod is rotated and struck with the number of rotations and strikes independently adjustable, and the bit is rotated at a constant speed that can be adjusted regardless of changes in the ground. This is an automatic drilling system that is automatically propelled by remote control, with air blow holes drilled in the bit in both the drilling direction of the bit and the opposite direction.

As described above, the present invention enables automatic drilling by remote control, solves problems in the working environment, and is suitable for various types of ground, which can efficiently drill holes in all types of ground where expanded-bottom foundations are applied in terms of workability. The object of the present invention is to provide a method and device for drilling a small diameter hole.

"Function" Since the bit shape of the present invention is optimal for drilling various types of ground such as soil layers or rock layers, there is no need to replace the auger drill and rock drill depending on the ground.

In addition, the number of rotations and number of hits of the bit at the tip of the rod can be adjusted separately, and the bit is automatically propelled at an adjustable constant speed, so there is no need to manually drill holes. In addition, automatic drilling is performed by remote control, and soundproofing measures are taken such as a dust collector is installed and the rotation, impact, and propulsion drive parts are operated by hydraulic pressure, so there is no vibration, dust, or noise during drilling. Problems in the working environment will also be eliminated.

Furthermore, because it uses constant speed propulsion, when entering soft ground from hard ground, there is no sudden large thrust unlike with main drive, and the amount of holes drilled does not become larger than the amount of earth removed.

In addition, since air blow-off holes are drilled in the bit in both the bit propulsion direction and the opposite direction, the holes will not become clogged, and compressed air will be continuously sent into the drilling path during drilling, resulting in cutting chips. This allows for smoother soil removal during soil excavation, and also prevents small pieces of rock from getting caught on the bit shoulders.

Furthermore, since a pipe with an outer diameter slightly smaller than the outside diameter of the bit is inserted into the bit to form a casing pipe, the excavated soil is conveyed between the spiral rod and the casing pipe like a screw conveyor, and chips and rocks are removed. Small pieces (small pieces of rock are crushed to a size that can pass through the bit groove and between the spiral rod and the casing pipe) are carried by air flow between the spiral rod and the casing pipe and remain in the drilling path. Since the dust collector is installed, there is no scattering of dust. Moreover, crushed stones on the inner wall of the drilling path can be prevented from falling into the rod portion, and rotational resistance of the bit and rod will not increase. In addition, the casing pipe acts as a guide for the rod,
Prevents rod deflection, maintains straightness of drilling, and prevents the center of drilling from shifting.

Embodiments Reference will now be made in detail to the accompanying drawings, which illustrate one example of implementing the present invention.

Reference numeral 1 is a center point, the tip of which is sharpened to make it easier to drive into the ground, and a disk-shaped seat plate 2 is inserted and fixed from the tip into the intermediate enlarged portion 1a, and the expanded bottom foundation construction surface 3 is excavated from the ground to the required depth. Using a hydraulic breaker or the like, a hydraulic breaker or the like is used to drive a liner plate 4, which serves as a shoring material, installed on the side periphery 3a of the construction surface 3 as a shoring material, from the tip of the center point 1 to the seat plate 2. Reference numeral 5 denotes a fulcrum base, to which a circular plate 5a similar to the seat plate 2 and a cylindrical portion 5b protruding upward from the circular plate 5a and into which a height adjustment screw 9 (to be described later) is inserted are fixed. Reference numeral 6 designates a spherical sliding bearing, which consists of an outer ring 6a having a spherical inner surface fixed to the lower end of the inner surface of the cylindrical portion 5b, an inner ring 6b having a spherical outer surface fitted into the outer ring 6a, and a shaft hole of the inner ring 6b. 6C, insert the core shaft 1b molded onto the intermediate enlarged portion 1a from the base end of the center point 1,
The fulcrum base 5 is also slidable in all directions about the center point 1. Reference numeral 7 denotes a jack bolt, which is screwed into each of the trisecting points on the same circumference on the disk 5a of the fulcrum base 5 by drilling screw holes therein.The tip of each jack bolt 7 is inserted into the center point 1. Seat plate 2 fixed by
By adjusting each jack bolt 7, the fulcrum base 5 is swung about the center point 1, and the level of the fulcrum base 5 is adjusted using a spirit level (not shown) installed on the fulcrum base 5. Then, the bolts 7 are tightened by nuts 7a inserted onto the fulcrum bases 5 of each jack bolt 7, and the fulcrum bases 5 are fixed at the level position. Reference numeral 8 denotes three embedded bolts protruding from the upper surface of the seat plate 2 of the center point 1, which pass through the bolt holes 5c around the fulcrum base 5, and insert nuts 8a from the tips of the respective embedded bolts 8 to secure the bolts to the fulcrum base. This will ensure that the level of 5 is maintained more reliably. 9
This is a cylindrical height adjustment screw with a thread bored on its outer surface, and has a fitting hole 9a formed at one end into which the cylindrical portion 5b of the fulcrum base 5 is inserted. Reference numerals 10 and 10 indicate height adjustment nuts which are inserted into the outer surface of the height adjustment screw 9 to adjust the height. Reference numeral 11 denotes a fixed base, which is made up of two angle irons 11a, 11a which are fixed at the lower surfaces of both ends of the two angle irons 11a, 11a facing each other as shown in FIGS. A connecting and fixing member 11b is attached, which has a hole 11c formed therein that corresponds to the hole 4b formed in the portion 4a. Reference numeral 12 designates a lower frame, as shown in FIG. 10, it is composed of opposing angle irons 11a, 11a of the fixed base 11 and angle irons 12a, 12a facing each other, which are connected and fixed to each other at the intermediate part, etc., and the fixed base 11 angle steel 11
A lower frame 12 is slidably mounted on the upper frame 11a and 11a, and both can be fixed with bolts 12d and nuts 12e through elongated holes 12c. 13 is a fixed base pedestal arm, fixed base pedestals 13a, 13a on which the angle irons 11a, 11a of the fixed base 11 are placed are fixed at both ends of the arm 13, and the height adjustment screw 9 can be inserted into the center. The height adjustment screw 9 is inserted into the through hole 13c of the block 13b, and the height adjustment nuts 10 are inserted into the top and bottom of the block 13b. By adjusting the nuts 10, 10, the height of the fixed base pedestal arm 13 is adjusted, and the fixed base 11 whose tip is fixed to the liner plate 4 is leveled.
Reference numeral 14 denotes a leveling device, which combines a device for leveling the fixed base 11 and a device for leveling the fulcrum base 5 by adjusting each of the jack bolts 7. 15, 15 is the fixed base 11
and the angle irons 11a, 11 of the lower frame 12, respectively.
a, 12a, 12a are fixed base pedestals 13a, 1
This is a floating retaining bolt that prevents it from being pulled out from the fixed base pedestal 13a, and is detachably inserted and fitted above the fixed base pedestals 13a, 13a. Reference numeral 16 denotes a frame, and as shown in FIGS. 3 and 4, angle irons 17a and 17
Consists of a main body frame 17 in which a is fixed in two rows,
Bearings 17 are provided on both sides of the bottom surface of the tip of the main body frame 17.
The main body frame 1
Bearings 17c are provided protrudingly on both sides of the lower surface of the middle part of 7, and a long hole 18c is bored in each one, and the long hole 18c is bored in the other side.
One end of the angle adjustment leg 18, which is made up of two angle irons 18a and 18a which are made telescopic by inserting a height adjustment bolt 18d penetrating through the main body frame 17
The other end of the angle adjusting leg 18 is rotatably supported on bearings 17c on both sides of the intermediate lower surface of the lower frame 12.
It is rotatably supported by bearings 12c protruding from the upper surface of the angle iron 12a on both sides of the other end. Reference numeral 19 denotes a slide table which slides on the main body frame 17, and has angle irons 17 on both sides as shown in FIG.
Adjustment plates 20a, 2 slightly thicker than the sides of a, 17a
The presser plates 20, 20 are fixed via 0a, and the sides 17d, 17d on both sides of the angle irons 17a, 17a are guided. Reference numeral 21 designates a gear box fixed on the slide base 19, with a hydraulic motor 22 as a rotation drive unit fixed to the upper base, a drive gear 23 fixed to the rotating shaft 22a of the motor 22, and a spiral to be described below. Rod 27
A shaft hole 24a into which a molded hexagonal shaft 27c is slidably inserted is provided at the base end of the shaft portion 27a, and bearing metals 24c, 24 are provided in the shaft portions 24b, 24b on both sides of the shaft hole 24a.
The driving gear 23 formed in the center with c
The hexagonal shaft 27c of the spiral rod 27 is housed at the lower base.
A cylindrical portion 21a that slidably guides a hammer 25 that applies a blow to the base end of the cylindrical portion 21a is continuously provided. 26
is a small stroke hydraulic cylinder as a driving part for striking, and the tip of a piston rod 26a of the cylinder 26 is connected to a rod hole 25a formed in the hammer 25.
It is inserted into and fixed to the base end of the cylindrical portion 21a of the gear box 21. Reference numeral 27 designates a spiral rod in which two spiral blades 27b, 27b are molded around a shaft portion 27a, and a hexagonal shaft portion 27c is molded at the base end of the shaft portion 27a. It is slidably inserted so as to protrude from the shaft hole 24a, and the distal end thereof is formed into a cross-shaped cutting edge with the rotation direction side substantially vertical, and the distal end of the cross-shaped portion 28a in the rotation direction is formed into a cross-shaped cutting edge. Each has a carbide tip 29 attached thereto, and a bit 28 is removably inserted into the body 28b in which two blades 28c, 28c are formed in a spiral shape continuously with a pair of opposing cutting edges of a cross-shaped cutting edge. It is. Numerals 30 and 30 are air blow-off holes opened in the digging direction of the bit 28, similar to the conventional ones, which are bored in the body part 28b of the bit 28, and 31 and 31 are air blow-off holes that are opened in the digging direction of the bit 28, as in the conventional case.
This is an air blowing hole that opens in the opposite direction to the digging direction of the bit 28 drilled in the hole 8b. 32 is a discharge part fixed to the tip of the gear box 21;
Spiral blades 2 of the spiral rod 27
The upper part near the ends of 7b and 27b is an air duct part 32a, and the lower part thereof is opened as an outlet for discharging large clods of soil that cannot be sucked up by a dust collector 56, which will be described later, and as an intake port 32b for increasing the dust collection capacity. be.
A pipe 33 has an outer diameter slightly smaller than the outer diameter of the bit 28, and is inserted into the spiral rod 27 to serve as a casing pipe.The base 33a of the pipe 33 is fixed to the tip of the discharge part 32. This is what I did. 34 is the main body frame 17 of the pedestal 16
The casing pipe 33 is slidably supported by a support fixed to the upper surface of the tip. 35
is a cone-shaped dustproof cap with a widened tip, whose base 35a is fixed to the tip of the main body frame 17, and is used to prevent dust generated when drilling holes in rock from spreading to the surrounding area. , the base portion 35a is slidably inserted into the casing pipe 33. 36 is a worm reducer consisting of a worm and a worm gear, and the main body frame 1
It is installed on the bottom surface of the proximal end of the input shaft 3.
A rotating shaft 38a of a hydraulic motor 38 as a propulsion drive unit is connected to 6a via a coupling ring 37,
A sprocket 39 is fixed to the output shaft 36b. A sprocket 40 similar to the sprocket 39 is fixed to a shaft 40a rotatably supported by bearings 17e protruding from both sides of the lower surface of the distal end of the main body frame 17. Reference numeral 41 denotes a chain, which is installed across the sprockets 39 and 40. Both ends of the chain 41 are fixed to a hanging plate 19a protruding from the lower surface of the slide table 19, and when the hydraulic motor 38 rotates, Move the chain 41 between sprockets 39 and 40,
The slide table 19 is moved forward or backward onto the main body frame 17. 42 is a dust collection duct connected to the dust collector 56, which is connected to the side opening 32c of the air duct section 32a above the discharge section 32, and the dust collection duct 42 and the dust collector 56 are connected by a dust collection hose 56a. This is for guiding the excavated soil, dust, etc. during rock drilling to the dust collector 56. 43
An air adjustment valve is connected to an air suction hole 44 provided in the cylindrical portion 21a that slidably guides the hammer 25, and is supplied from an air compressor 57 via an air hose 57a by an on-off valve 43a. The exhaust holes 30, 30, 31, 31 of the bit 28 are adjusted through a known air hole 27d drilled in the center of the shaft portion 27a of the spiral rod 27 from the base end to the tip end.
The air is blown out from the 45,4
5 is the inflow of oil into the hydraulic motor 22 of the rotary drive unit;
A pipe for discharging water, which is connected to an engine-type hydraulic unit 58 with a hydraulic hose 58a through one port of a forward/reverse rotation switching valve 47 as a remote control device 46a installed on a remote control console 46 and a three-way distributor 48. By switching the switching valve 47, the oil supply and return are switched, and the forward and reverse rotation of the hydraulic motor 22 is switched. 49, 49 are pipes for inflowing and discharging oil into the hydraulic cylinder 26 of the impact drive unit, and a remote control device 46 installed on the remote control table 46.
It is connected to the hydraulic unit 58 through the drive stop switching valve 50, the variable flow rate adjustment valve 51, and the other port of the distributor 48 as shown in FIG.
to control the start and stop of the impact of the hammer 25 on the base end of the hexagonal shaft portion 27c of the spiral rod 27, and by adjusting the adjustment dial 51a of the variable flow rate adjustment valve 51, the number of impacts can be arbitrarily adjusted. This is what I did. Reference numerals 52 and 52 designate pipes for inflowing and discharging oil into and out of the hydraulic motor 38 of the propulsion drive unit, and a forward and backward switching valve 53 as a remote control device 46a installed on the remote control console 46, respectively, for adjusting forward and backward speeds. It is connected to a hydraulic unit 58 through variable flow rate adjustment valves 54, 55 and the other port of the distributor 48, and selects forward or backward movement of the slide base 19 by switching the forward/backward switching valve 53. In the case of forward movement or backward movement, the forward or backward speed is adjusted by adjusting the adjustment dials 54a and 55a of the forward variable flow rate regulating valve 54 or the backward variable flow rate regulating valve 55, respectively.

Next, when using the device of the present invention, a cylindrical liner plate 4 for earth retaining is installed on the side periphery 3a of the expanded bottom foundation construction surface 3 that has been excavated to the required depth from the ground as in the conventional construction method. Then, use a hand breaker or the like to drive the center point 1 from the tip of the center point 1 to the seat plate 2 near the center of the construction surface 3 of the circular cross section that the liner plate 4 constitutes, and place a fulcrum at the base end of the center point 1. base 5
The cylindrical part 5b is inserted from below, and the cylindrical part 5
Inner ring 6 of spherical sliding bearing 6 with outer ring 6b fixed to b
The shaft hole 6c of b is inserted into the center shaft 1b on the intermediate enlarged portion 1a of the center point 1, and each embedded bolt is provided in each bolt hole 5c of the disc 5a of the fulcrum base 5 to protrude from the upper surface of the seat plate 2. 8 and insert the disc 5
Place the tip of each jack bolt 7 inserted into a in contact with the seat plate 2, adjust each jack bolt to level the disc 5a of the fulcrum base 5, and hold the cylindrical part 5b vertically. . Next, the insertion hole 9a of the height adjustment screw 9, in which the height adjustment nuts 10, 10 are inserted in advance on the upper and lower sides of the fixed base pedestal arm 13, is fitted into the cylindrical portion 5b, and the fixed base pedestal arm 13 is inserted into the insertion hole 9a of the height adjustment screw 9.
The fixed base 1 is attached to the fixed base pedestals 13a, 13a.
The angle irons 11a, 11a of 1 are placed, and the angle irons 1
Connection fixing member 11 at the tip of each of 1a and 11a
b is fixed to the connecting flange portion 4a of the liner plate 14, and the level of the fixed base 11 is adjusted by adjusting the height adjustment nuts 10, 10,
The lower frame 12 of the pedestal 16 is equipped with a slide stand 19 on the main body frame 17, drive parts for rotation and impact on the slide stand 19, and a drive part for propulsion on the lower surface of the base end of the main body frame 17. Fixed base 1
Place it on 1. Next, the drilling angle α is selected by extending and contracting the height of the angle adjusting legs 18 on both sides of the pedestal 16, and the bit 28 at the tip of the spiral rod 27 is aligned with the drilling hole, and the fixing base is 11 and the lower frame 12 are fixed. Next, set the remote control console 46, dust collector 56, air compressor 57, and hydraulic unit 58, and connect the hydraulic hose 58a, air hose 57a, and dust collection hose 56a to the hydraulic unit 58 and the three-way outlet distributor 48 of the operation console 46. The three-way outlet of the distributor 48 is connected to the hydraulic motors 22, 38, the hydraulic cylinder 26, the air compressor 58 and the air adjustment valve 43, and the dust collector 56 and the dust collection duct 42, respectively.

If the ground to be drilled in this state is a soil layer, if the forward/reverse switching valve 47 of the remote control device 46a is operated from the neutral stop position to the forward rotation direction, the rotation drive hydraulic motor 22 will cause the drive gear 23 to gear 24
Rotation is transmitted to the hexagonal shaft 27c through the hexagonal shaft 27c, causing the spiral rod 27 to rotate in the casing pipe 33.Next, when the forward/backward switching valve 53 is operated from the neutral position to the forward side, the propulsion hydraulic motor 38 is changed. The hanging plate rotates at a speed according to the setting of the flow rate adjustment valve 54, and the rotation is converted into the forward motion of the chain 41 installed on the sprockets 39 and 40 via the worm reducer 36, and the hanging plate fixes both ends of the chain 41. The slide table 19 moves forward along the main body frame 17 via the slide 19a. Along with this, slide stand 1
A rotating hydraulic motor 22, a striking hydraulic cylinder 26, a spiral rod 27, and a casing pipe 33 are fixed to the rotary cylinder 9 via a gear box 21.
The casing pipe 33 and the spiral rod 27 move forward together, and the casing pipe 33 and the spiral rod 27 are guided by a support base 34 fixed to the upper surface of the tip of the frame 17 and protrude from the tip of the main body frame 17, and the spiral rod 2
Diagonal drilling is started by the bit 28 attached to the tip of the hole 7. Before starting the oblique drilling, the on-off valve 43a of the air adjustment valve 43 is opened in advance, and compressed air from the air compressor 57 is supplied to the cylindrical part 21a from the air suction port 44. Air is blown out from the air blowing holes 30, 30, 31, 31 of the bit 28 through the air hole 27d of the shaft portion 27a of the door 27. Then, the soil drilled by the bit 28 is conveyed between the spiral rod 27 and the casing pipe 33 like a screw conveyor by the rotation of the spiral rod 27 fitted into the casing pipe 33. , 27b
The soil is sent to the discharge section 32 near the terminal end of the soil, and is sucked into the dust collector 56 through the air duct 32a, and large clods of soil that cannot be sucked up by the dust collector are discharged to the outside from the soil discharge port 32b. At this time, the air supplied from the bit 28 disperses the earth and sand and provides buoyancy, so that smooth earth removal can be achieved.

In addition, when the ground is from the ground surface to a bedrock layer, or when the ground has changed from a soil layer to a bedrock layer, if the drive stop switching valve 50 of the remote control device 46a is operated to the activation side in the above state, the impact hydraulic cylinder 26 is activated, and the hammer 25 fixed to the tip of the piston rod 26a makes a reciprocating motion with a small stroke according to the setting of the variable flow rate regulating valve 51, and the hexagonal shaft of the shaft portion 27a of the spiral rod 27 in a rotating state 27c Transmit the impact force to the base end of the spiral rod 2
Since the bit 28 at the tip of 7 is subjected to a combination of rotation and impact, drilling in the rock layer can be carried out efficiently. At this time, the chips generated by drilling into the rock mass pass through the air hole of the spiral rod 27 and are blown out from the air blowing holes 30, 30, 31, 31 of the bit 28, as in the case of the drilling soil. Due to the force, the airflow is carried between the spiral rod 27 and the casing pipe 33, and the dust is transferred from the air duct part 32a of the discharge part 32 to the dust collection duct 4.
2 to the dust collector 56.

Furthermore, when the bedrock layer shifts to the soil layer, the drive stop switching valve 50 of the remote control device 46a is operated to the stop side, the operation of the impact hydraulic cylinder 26 is stopped, and only rotation by the rotation hydraulic motor 22 is performed. is applied to the bit 28 at the tip of the spiral rod 27.

When drilling is completed, the forward/backward switching valve 53 is operated to the backward side, the propulsion hydraulic motor 38 is rotated in the opposite direction, and the slide table 19 is moved to the main body frame 1.
7, and the drilling work at one location is completed.

When drilling the next hole, the connecting flange 4a of the liner plate 4 at the previous drilling position and the connecting fixing members 11a, 11b at the tip of the fixed base 11 are released, and the connecting fixing members 11b, 11b are removed. A height adjustment screw 9 is installed in the circumferential direction of the liner plate 4.
The same operation as above is carried out by simply moving the fulcrum base 5 around the cylindrical portion 5b of the fulcrum base 5 fitted into the insertion hole 9a and fixing it again to the connecting flange portion 4a of the liner plate 4 at the next drilling position. By repeating this process, the hole can be drilled. Although this embodiment is applied to drilling for the base of a steel tower, it is of course applicable to drilling other holes.

"Effects of the Invention" The present invention has the above-described configuration, and even if the ground is a soil layer, a bedrock layer, or a layer of layers in which these layers are mixed,
There is no need to replace tools such as the bit 28 or spiral rod 27, and drilling in various types of ground can be performed automatically by remote control without requiring human labor. There will be fewer people.

In addition, since automatic drilling is possible by remote control, there is no vibration caused by drilling, and there is no direct exposure to waste soil. Chips are sucked into the dust collector 56 through the discharge section 32, so the bottom can be expanded. Since the driving parts 22, 26, and 38 are hydraulically driven, there is no engine or exhaust noise that occurs with conventional engine rock drills or air rock drills, and the hitter can also enjoy the spiral movement. Since the rod 27 is covered with the casing pipe 33, the working noise is kept low, and the working environment such as vibration, dust, and noise is improved.

Furthermore, since the casing pipe 33 is inserted into the spiral rod 27, the excavated soil and chips are removed from the spiral rod 27 and the casing pipe 33, respectively.
Since it is conveyed like a screw conveyor or airflow between the holes and does not stagnate in the drilling path, it does not create resistance to the rotation of the spiral rod 27 and the bit 28 and does not become impossible to drill.

In addition, it is possible to prevent small pieces of rock from getting caught in the shoulder of the bit, maintain the straightness of drilling, and prevent the hole from shifting during drilling, which makes it necessary to draw out the spiral rod 27 and bit 28 with great force. It can be easily pulled out without causing any damage, improving work efficiency.

[Brief explanation of the drawing]

The attached drawings show an example of an embodiment of the present invention, in which Fig. 1 is a schematic side view, partially in section, showing the state in which the drilling device of the present invention is used, and Fig. 2 is a partially sectional view of the main body of the device. Schematic side view of Figure 3 is Figure 2 A-A
Figure 4 is an enlarged cross-sectional view of the main part along the line B-B, Figure 5 is a plan view of the main part with the slide platform lowered to the lowest end of the main body frame, and Figure 6 is the main part plan view. Figure 5 is an enlarged cross-sectional view taken along the line C-C, Figure 7 is a cross-sectional view of the main part taken along the line D-D, Figure 8 is a side view of the bit, Figure 9 is a front view of the same, and Figure 10 is a horizontal adjustment device placed on the ground. 11 is an exploded perspective view of the horizontal adjustment device, and FIG. 12 is a front view of the remote control console. DESCRIPTION OF SYMBOLS 1... Center point, 1a... Intermediate expansion part, 1b... Center axis, 2... Bottom plate, 3... Expanded base construction surface, 3a... Side circumference, 4... Liner plate, 4a... Connecting flange part , 4b... hole, 5...
...Fulcrum base, 5a...disc, 5b...cylindrical part,
6... Spherical sliding bearing, 6a... Outer ring, 6b... Inner ring, 6c... Shaft hole, 7... Jacket bolt, 7a
... Nut, 8 ... Embedded bolt, 8a ... Nut, 9 ... Height adjustment screw, 9a ... Fitting hole,
10... Height adjustment nut, 11... Fixed base,
11a... angle iron, 11b... connection fixing member, 1
1c...hole, 12...lower frame, 12a...angle iron, 12b, 12c...bearing, 12c...long hole, 12d...bolt, 12e...nut, 13
...Fixed base pedestal arm, 13a...Fixed base pedestal, 13b...Block, 13c...Through hole, 14...Horizontal adjustment device, 15...Floating stop bolt, 16... Frame, 17... Main body frame, 1
7a... angle iron, 17b, 17c... bearing, 17
d...Side, 17e...Bearing, 18...Angle adjustment leg, 18a, 18b...Angle iron, 18c...Long hole, 18d...Height adjustment bolt, 19...Slide base, 19a...Descent Board, 20...Press plate, 20
a... Adjustment plate, 21... Gearbox, 22...
... Hydraulic motor, 22a ... Rotating shaft, 23 ... Drive gear, 24 ... Driven gear, 24a ... Shaft hole, 24
b...shaft, 24c...bearing metal, 25...hammer, 25a...rod hole, 26...hydraulic cylinder, 26a...piston rod, 27...spiral rod, 27a...shaft, 27b... Blade, 27c...Hexagonal shaft, 27d...Air hole, 2
8...Bit, 28a...Cross-shaped part, 28b...
...Body part, 28c...Feather, 29...Carbide tip,
30, 31... Air blowout hole, 32... Discharge part, 32a... Air duct part, 32b... Soil discharge port and intake port, 32c... Side opening, 33...
Casing pipe, 33a... base, 34... support stand, 35... dustproof cap, 35a... base,
36...Worm reducer, 36a...Input shaft, 3
6b... Output shaft, 37... Coupling, 38...
...Hydraulic motor, 38a... Rotating shaft, 39, 40...
...Sprocket, 40a...Shaft, 41...Chain, 42...Dust collection duct, 43...Air adjustment valve, 43a...Opening/closing valve, 44...Air inlet, 45...Piping, 46...Remote control Stand, 46a
...Remote control device, 47...Forward/reverse rotation switching valve, 4
8... Three-way outlet distributor, 49... Piping, 50... Drive stop switching valve, 51... Variable flow rate adjustment valve, 51a
...Adjustment dial, 52...Piping, 53...Forward/backward switching valve, 54, 55...Variable flow rate adjustment valve, 5
4a, 55a...adjustment dial, 56...dust collector, 56a...dust collection hose, 57...air compressor, 57a...air hose, 58...
Hydraulic unit, 58a...hydraulic hose.

Claims (1)

[Scope of Claims] 1. A bit whose rotational speed and number of blows can be freely adjusted are given optimal rotation and blows to various types of ground at the tip of the bit via a spiral rod with a casing by remote control, and the bit is The rod is automatically propelled at an adjustable speed and at a constant speed that is not affected by changes in the ground, and air is passed through the center of the rod, and the air is injected in both directions, from the bit to the bit in the digging direction and in the opposite direction. Powder and soil pass between the spiral rod and the casing,
A small-diameter drilling method suitable for various types of ground, characterized by ejecting the hole from the base of the spiral rod using a separate power source. 2. A fixed base is rotatably provided via a horizontal adjustment device on the construction surface at the center of the liner plate installed on the side circumference of the construction surface of the expanded base foundation excavated from the ground at the required depth, and the tip of the fixed base is attached to the liner plate. A lower frame is removably fixed to a supporting material, etc., a lower frame is slidably placed on the fixed base, the tip of the mount is rotatably supported at one end of the lower frame, and The end part and the middle part of the pedestal are rotatably supported by telescopic angle adjustment legs, and a slide pedestal is provided that slides on the pedestal, and a rotation drive unit and a striking part are mounted on the slide pedestal. The proximal end of a spiral rod, which has a bit fixed at its tip with air blow holes drilled in both the excavation direction and the opposite direction, is connected to the rotation drive part and the striking drive part. Then, a casing pipe is inserted into the spiral rod, the base of the pipe is fixed to a discharge section installed at the base end of the spiral rod, and the tip of the pipe is slid onto a support base fixed above the tip of the frame. The air duct part above the discharge part is connected to the dust collector, and the lower part of the discharge part is opened as a discharge port for large earth clods etc. that cannot be sucked up by the dust collector, and as an intake port to increase the dust collection capacity. A dust-proof cap into which the casing pipe is slidably inserted is attached to the tip of the pedestal, and a propulsion drive unit is provided for moving the slide pedestal forward and backward on the pedestal together with a spiral rod, and each of the drive units is A small-diameter device suitable for various types of ground that is equipped with a remote control device that allows the number of rotations and strikes to be adjusted separately according to the ground, and the propulsion drive to be adjusted at a constant speed. Drilling equipment. 3. A spherical sliding bearing is installed above the seat plate of the center point driven into the bottom surface of the construction near the center of the circular cross-section made up of supporting materials such as liner plates installed around the side of the construction surface of the expanded base foundation excavated to the required depth from the ground. Insert the fulcrum base through the fulcrum base, screw the jack bolt that contacts the seat plate into the fulcrum base,
Rotatably insert the height adjustment screw above the fulcrum base, screw the height adjustment nut onto the screw from above and below to fix the fixed base pedestal arm, and insert the tip of the arm into the fixed base pedestal. A fixed base removably fixed to the supporting material such as the liner plate is inserted and mounted, and a leveling device is used to level the fixed base and the fulcrum base, and the lower frame is slidably and fixably mounted on the fixed base. The tip of the pedestal is rotatably supported at one end of the lower frame, and the other end of the lower frame and the middle part of the pedestal are rotatably supported by telescopic angle adjusting legs. A slide base is installed to support and slide on the pedestal, a rotation drive unit and a striking drive unit are arranged on the slide base, and air blow holes are bored in both the excavation direction and the opposite direction. The proximal end of a spiral rod with a fixed bit fixed to the tip is connected to the rotating drive section and the striking drive section, and a casing pipe having an outer diameter slightly smaller than the outer diameter of the bit is inserted into the spiral rod. , the pipe base is fixed to a discharge part provided at the base end of the spiral rod, and the pipe tip is slidably inserted into a support fixed above the pedestal tip;
The air duct above the discharge part is connected to a dust collector, and the lower part of the discharge part is opened as a discharge port for large lumps that cannot be picked up by the dust collector, and as an intake port to increase the dust collection capacity. A dust-proof cap into which the pipe is slidably inserted is attached, a propulsion drive section is provided for moving the slide platform forward and backward on the pedestal together with a spiral rod, and a remote controller is provided to remotely control each of the drive sections. A small-diameter drilling device suitable for various types of ground, characterized in that it is equipped with a control device so that the rotation and the number of blows can be adjusted separately according to the ground, and the propulsion drive can be adjusted at a constant speed. 4 Air blow-off holes are bored in the bit in both the digging direction and the opposite direction, which are continuous with the air holes in the spiral rod, and the bit shape is a cross-shaped blade with the rotation direction side being almost vertical, and the tip part is made in the rotation direction. 4. A small-diameter drilling device suitable for various types of ground according to claim 2 or 3, characterized in that a carbide tip is attached and the bit body is formed into a spiral shape similar to a spiral rod. 5. The rotation drive unit, the impact drive unit, and the propulsion drive unit are each operated by hydraulic pressure, and the remote control device for each drive unit includes a forward/reverse rotation switching valve for at least the rotation drive unit, and a forward/reverse rotation switching valve for the impact drive unit. A small-diameter drilling hole suitable for various types of ground according to claim 2 or 3, characterized in that a hydraulic circuit including a drive stop switching valve for the propulsion drive unit and a forward/backward switching valve for the propulsion drive unit is installed. Device.