JPH01226996A - Method and apparatus for drilling small hole matching various ground - Google Patents

Abstract

PURPOSE:To raise the efficiency of construction work by a method in which a bit on the tip of a rod is allowed to rotate, strike and advance on a remote control basis through a spiral rod with casing pipe for excavation and the excavated soil is discharged by a separate power. CONSTITUTION:An oil-pressure cylinder 26 for striking, having an oil-pressure motor 22 for rotational driving and a hammer 25 which are set on a slide base 19 on the body frame 17 and an oil-pressure motor 38 to move the base 19 back and forth by a chain 41 are operated on a remote control basis. Turning, striking, and advancing actions are given to a bit 28 on the tip of a rod through a spiral rod 27. Excavated soil, small rock pieces, and dust during the excavation are discharged from the space between the rod 27 and the casing pipe 33 by means of the spiral blade 27b of the rod 27 and also by compressed air from the air-blow holes 30 and 31 of the bit 28. The efficiency of operations can thus be raised.

Description

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

"Conventional Technology" Conventionally, the mainstream of large steel tower foundations has been an expanded bottom foundation, and when digging the expanded bottom part, diagonal pile anchor work is performed to support the ground from collapsing.

In the slope shaft anchor work, holes are manually drilled using an auger drill with a bit attached to the tip for soil layers, and a rock drill with a drill bit attached to the tip for rock layers, respectively, depending on the ground.

``Problems to be solved by the invention'' In conventional slanted pile anchor construction, drilling is done manually, so
In addition to being very hard work, it also has the disadvantage of creating an extremely poor working environment due to vibrations, dust, and noise.

In addition, in terms of workability, clay may stick to the auger in clayey soil layers, making it impossible for the soil to be removed to keep up with the amount of excavation, or the air blowout hole in the excavation direction drilled in the tip of the bit may be clogged with clay. This has the drawback that the soil may not be able to be removed, causing it to stagnate around the bit and rod (power transmission shaft), increasing the rotational resistance of the bit and rod, and 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 bit at the tip at the same time, and therefore the bit structure must be suitable for this purpose.However, conventional auger drills use only rotation. Suitable for drilling holes in clay and sand layers, the rock drill is suitable for drilling holes in bedrock layers, so it uses striking force as its main force and rotates in one direction with the up and down movement of the panma piston. Since the force is small, it takes a very long time to drill holes in sand and gravel layers.

Furthermore, if the rock and soil are in alternating layers, when drilling through the rock layer and entering the soil layer, the amount of excavation will be extremely large, making it impossible to drill due to the same phenomenon as in the case of the clayey soil layer. Become. In addition, small pieces of rock generated when drilling through a rock layer get caught in the shoulder (rear part of the outer diameter part) of the bit, making it difficult to pull them out.

The conventional method involves manual drilling, and since the rod diameter is much smaller than the drilling diameter, the center of the hole inevitably shifts. When the bit and rod are pulled out after drilling a hole to a depth of 2.0, the center of the hole is shifted, and the shoulder of the bit hits the edge of the rock, requiring a strong pulling force.

"Means for Solving the Problems" The present invention was made to solve the above problems, and the rod is a spiral rod inserted into a casing pipe, and a bit at the tip of the rod is used to drill holes in various types of ground. The bit at the end of the rod is given rotation and impact with the number of rotations and number of impacts independently adjustable, and the bit is remotely controlled 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 operation, and the air blowing holes drilled in the bit are 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 present invention has a bit shape that is optimal for drilling holes in various types of ground such as soil layers or bedrock layers, there is no need to replace the auger drill and rock drill depending on the ground.

In addition, since the bit at the tip of the rod can be independently adjusted in rotation speed and impact speed, and the bit is automatically propelled at an adjustable constant speed, there is no need to drill holes manually.

In addition, automatic drilling is performed by remote control, and a dust collector is installed.
Since the rotation, impact, and propulsion drive parts are operated by hydraulic pressure, soundproofing measures are taken, so there are no problems with the working environment during drilling, such as vibration, dust, and noise.

Furthermore, since it is propelled at a constant speed, when entering soft ground from hard ground, there is no sudden large thrust unlike with manual operation, and the amount of holes drilled does not become larger than the amount of soil removed.

In addition, since the bit has air blowing holes 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, allowing chips to be removed. This enables smoother soil removal during soil excavation, and also prevents small pieces of rock from getting caught on the shoulder of the bit.

Furthermore, since a pipe with an outer diameter slightly smaller than the bit outer diameter is inserted into the rod 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 small pieces of rock ( Small pieces of rock are crushed to a size that allows them to 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 vibe, and are not stagnated in the drilling path. , There is no scattering of dust due to the installation of a dust collector. The crushed stones on the inner wall of the upper hole can be prevented from falling into the rod portion, and the rotational resistance of the bit and rod will not increase. In addition, the casing pipe acts as a guide for the rod, preventing the rod from swinging, maintaining the straightness of drilling, and preventing the center of the hole from shifting.

[Example J] Reference will now be made in detail to the accompanying drawings, which illustrate one example of the implementation of the present invention.

1 is a center point, the tip of which is sharp so that it can be easily driven into the ground, and a disc-shaped seat Fi2 is inserted and fixed from the tip into the intermediate enlarged portion 1a, and the expanded base foundation construction surface 3 is excavated from the ground to the required depth. A hydraulic breaker or the like is used to drive a liner plate 4 as a shoring material installed on the side periphery 3a of the construction surface 3 to the center of the construction surface 3 from the tip of the center point l 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, in which an outer ring 6a having a spherical inner surface is fixed to the lower end of the inner surface of the cylindrical portion 5b, and an inner ring 6b having a spherical outer surface is fitted into the outer ring 6a.
A center point 1 is provided in the shaft hole 6c of the inner ring 6b.
A core shaft 1b formed on the intermediate expanded portion 1a is inserted from the base end of the fulcrum base 5 to be able to swing freely in all directions about the center point 1. Reference numeral 7 is a jack bolt, which is screwed into each of three trisecting points on the same circumference on the fulcrum pace 50 disc 5a by drilling a tapped hole therein.
By inserting the tip of each jack bolt 7 into the center point 1 and abutting it on the fixed seat plate 2, and adjusting each jack bolt 7, the fulcrum base 5 is swung about the center point 1, and the fulcrum base 5 Level the fulcrum base 5 using a spirit level (not shown) installed above,
Tighten the jack bolts 7 with the nuts 7a inserted onto the fulcrum base 5 of each jack bolt 7, and
is 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 the bolts 8a from the tip of each embedded bolt 8, and then This will ensure that the base 5 level is maintained. Reference numeral 9 denotes a cylindrical height adjusting screw having a threaded outer surface, and has an insertion hole 9a at one end into which the cylindrical portion 5b of the fulcrum base 5 is inserted. 10.10 is a height adjustment nut that is inserted into the outer surface of the height adjustment screw 9 to adjust the height. 11 is a fixed base, two angle irons 11a, lla
As shown in FIGS. 10 and 11, these are opposed and fixed at the lower surfaces of both ends thereof, and holes 4b are formed at the ends of the connecting flange portions 4a of the liner plate 4, respectively.
A connecting and fixing member 11b is provided with a hole 11c that corresponds to the size of the hole 11c. Reference numeral 12 denotes a lower frame, and as shown in FIG.
The fixed base 11 is composed of chevron-shaped tlils 12a, 12a facing each other, and connected and fixed to each other at the middle part etc.
The lower frame 12 is slidably mounted on the angle irons 11a and lla.
is mounted, and both can be fixed with bolts 12d and nuts 12e through elongated holes 12c. 13 is a fixed base pedestal arm, and fixed bases 1 are attached to both ends of the arm 13.
1 angle iron 11a.

A through hole 13 in which the fixed base pedestals 13a, 13a on which the holder 11a is placed is fixed, and the height adjustment screw 9 can be inserted in the center thereof.
c@ Equipped with a drilled block 13b, the height adjustment screw 9 is inserted into the through hole 13c of the block 13b,
By inserting the height adjustment nuts 10.10 above and below the block 13b and adjusting the nuts 10.10, the height of the fixed base pedestal arm 13 is adjusted, and the tip is fixed to the liner plate 4. This is to determine the level of the fixed base 11. 14 is a horizontal adjustment device, and cough fixing base 11
This is a combination of a device for leveling the fulcrum base 5 and a device for leveling the fulcrum base 5 by adjusting the respective jack bolts 7. 15. 15 are angle irons 11a, lla, 12a, 12a of the fixed base 11 and lower frame 12, respectively.
A lifting bolt that prevents the fixed base holders 13a, 13a from being pulled out from the fixed base holders 13a, 13a.
It is removably inserted above a. Reference numeral 16 is a frame made of angle iron 17 a + as shown in Figs. 3 and 4, etc.
Consists of a main body frame 17 with 17a fixed in two rows,
Bearings 17b are provided protrudingly on both sides of the lower surface of the tip of the main body frame 17, and angle irons 12a on both sides of one end of the lower frame 12 are provided.
A bearing 12b protruding from the lower surface and the bearing 17b are rotatably supported, and bearings 17c are protruded from both sides of the middle lower surface of the main body frame 17, and a long hole 18c is bored in each one.
Two angle irons 18a are made expandable and retractable by inserting a height adjustment pole 18d passing through the elongated hole 18c into the other.

One end of the angle adjustment leg 18 made of #18b is rotatably supported on bearings 17c on both sides of the middle lower surface of the main body frame 17, and the other end of the angle adjustment leg 18 is supported on both sides of the other end of the lower frame 12. It is rotatably supported by a bearing 12c protruding from the upper surface of the angle iron 12a. Reference numeral 19 denotes a slide table which slides on the main body frame 17, and as shown in FIG.
are fixed, and the sides 17d and 1 on both sides of the angle irons 17a and 17a are fixed.
7d. Reference numeral 21 denotes 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. 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 of the rod 27, and a bearing metal 2 is provided in the shaft portions 24b on both sides of the shaft hole 24a.
4c, 24c are interposed in between, and houses a driven gear 24 that meshes with the driving gear 23 molded in the center, and a hammer 25 that strikes the base end of the hexagonal shaft 27c of the spiral rod 27 at the lower base. A cylindrical portion 21a that slidably guides the cylindrical portion 21a is provided in series. Reference numeral 26 denotes a small-stroke hydraulic cylinder as a driving part for impact, and the tip of a piston rod 26a of the cylinder 26 is inserted into a rod hole 25a drilled in the hammer 25 and fixed thereto, and the cylindrical part of the gear box 21 is fixed thereto. It is fixed to the base end of 21a. 27 is a spiral rod, and has two spiral blades 27b around a shaft portion 27a.

27b, a hexagonal shaft part 27c is molded at the base end of the shaft part 27a, and is slidably inserted so as to protrude from the shaft hole 24a of the driven gear 24. The cross-shaped part 28a is formed into a cross-shaped cutting edge with the rotation direction side substantially vertical, and a carbide tip 29 is attached to each tip in the rotation direction of the cross-shaped part 28a, and a set of opposing cutting edges of the cross-shaped cutting edge A bit 28 in which two consecutive blades 28C128c are formed into a spiral shape on a body portion 28b is removably inserted.

Reference numeral 30.30 is an air blowing hole opened in the digging direction of the bit 2, similar to the conventional one, which is bored in the body 28b of the bit 28, and 31.31 is an air blowing hole that is opened in the digging direction of the bit 28, which is bored in the body 28b of the bit 28.
This is an air blowing hole that opens in the direction opposite to the direction in which the trench advances. Reference numeral 32 denotes a discharge section fixed to the tip of the gear box 21, and the air duct section 32 connects the spiral blades 27b of the spiral rod 27 above the terminal ends of the spiral blades 27b, 27b.
a, and the lower part thereof is an outlet for discharging large clods of soil that cannot be collected by a dust collector 56, which will be described later, and an intake port 32 for increasing the dust collection capacity.
It is open as b. 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. It is something. Reference numeral 34 denotes a support base fixed to the upper surface of the tip of the main body frame 17 of the pedestal 16, and the casing pipe 33
It is a support that can be slid freely. Reference numeral 35 denotes 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 dispersing 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 is installed on the lower surface of the base end of the main body frame 17, and the hydraulic motor 3 as a propulsion drive unit is connected to the input shaft 36a via a coupling 37.
8 rotating shafts 38a are connected to each other, and a sprocket 39 is fixed to the output shaft 36b. Reference numeral 40 denotes a sprocket similar to the sprocket 39, which 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, Chain 4 between sprockets 39 and 40
1 to move the slide table 19 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 dust, etc. during drilling and rock drilling to the dust collector 56. Reference numeral 43 denotes an air adjustment valve, which 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. By adjusting the flow rate of air, the air is released from the exhaust holes 30, 30 and 31 of the bit 28 through a well-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. It blows out air. 45° 45 is a pipe for inflowing and discharging oil into and out of the hydraulic motor 22 of the rotary drive unit;
A forward/reverse rotation switching valve 47 as a remote control device 46a installed on a remote control console 46 and one port of a two-way distributor 48 are connected to an engine-type hydraulic unit 58 with a hydraulic hose 58a. By switching 47, oil supply and return are switched, and the forward and reverse rotation of the hydraulic motor 22 is switched. 49° 49 is a pipe for inflowing and discharging oil into and out of the hydraulic cylinder 26 of the impact drive unit, and includes a drive stop switching valve 50 as a remote control device 46a installed on the remote control console 46, a variable flow rate adjustment valve 51, and a distributor. 48 is connected to a hydraulic unit 58 through the other port of the hexagonal shaft portion 27c of the spiral rod 27 by switching the drive stop switching valve 50 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, Adjustment dial 51 of variable flow rate adjustment valve 51
By adjusting a, the number of blows can be arbitrarily adjusted. 52. 52 is a pipe for inflowing and discharging oil to the hydraulic motor 38 of the propulsion drive unit, and is connected to the remote control console 46.
A forward/backward switching valve 53 as a remote control device 46a installed in the remote control unit 46a is connected to a hydraulic unit 58 through variable flow rate adjustment valves 54,55 for adjusting forward and backward speeds, and the other port of the distributor 48. The forward and backward switching valve 53 is switched to select forward or backward movement of the slide base 19, and in the case of forward or backward movement, the adjustment dial of the forward variable flow rate adjustment valve 54 or the backward variable flow ffl adjustment valve 55 is switched. 54a.

55a to adjust the forward or backward speed.

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 base construction surface 3 excavated to the required depth from the ground as in the conventional construction method. , 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 constituted by the liner plate 4, and attach a fulcrum base to the base end of the center point 1. The cylindrical portion 5b of No. 5 is inserted from below, and the shaft hole 6C of the inner ring 6b of the spherical sliding bearing 6 with the outer ring 6b fixed to the cylindrical portion 5b is inserted into the center shaft 1b on the intermediate enlarged portion la of the center point 1. At the same time, each bolt hole 5 of the disc 5a of the fulcrum base 5
Insert each of the embedded bolts 8 protruding from the upper surface of the seat plate 2 at c, place the tips of each of the jack bolts 7 inserted into the circle tN5a in contact with the seat plate 2, and adjust each jack bolt. to level the disc 5a of the fulcrum base 5, and
Hold b vertically. Next, height adjustment nuts 10°10 are installed above and below the base pedestal arm 13 fixed in advance to the cylindrical portion 5b.
The fixed base pedestals 13a, 13 of the fixed base pedestal arm 13 are inserted into the insertion holes 9a of the height adjustment screws 9 into which the fixed base pedestal arms 13 are inserted.
Place the angle irons 11a and lla of the fixed base 11 on a,
The angle iron 11a.

The connecting fixing members 11b at the ends of each of the connecting fixing members 11a are fixed to the connecting flange portions 4a of the liner plate 4, and the fixed base 11 is leveled by adjusting the height adjustment knobs 10 and 10. Slide stand 1
9 and the lower frame 12 of the pedestal 16, which is equipped with rotation and impact drive units on the slide base 19 and a propulsion drive unit on the lower surface of the base end of the main body frame 17, is placed on the fixed base 11. do. Next, the height of the angle adjusting legs 18 on both sides of the pedestal 16 is expanded and contracted to select the drilling angle α, and the bit 28 at the tip of the spiral rod 27 is aligned with the drilling hole, and the fixed base 11 and the lower frame 12 are fixed. Next, the remote control console 46, dust collector 56, air compressor 57, and hydraulic unit 58 are set, and the hydraulic hose 58a1, air hose 57a, and dust collection hose 5 are set.
6a is a two-way outlet distributor 4 between the hydraulic unit 58 and the operating table 46.
8 main valve, the three-way outlet of the distributor 48 and the hydraulic motor 22.3
8. Connect 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 Rotation is transmitted to the hexagonal shaft 27c via the gear 24, and the spiral rod 27 rotates in the casing pipe 33. Next, when the forward/backward switching valve 53 is operated from the neutral position to the forward side, the semi-advancing hydraulic motor 38 rotates at a speed according to the setting of the variable flow rate adjustment valve 54, and the rotation is controlled via the worm reducer 36. This is converted into the forward movement of the chain 41 installed on the sprockets 39 and 40, and the slide base 19 moves forward along the main body frame 17 via the hanging plate 19a to which both ends of the chain 41 are fixed.

Accordingly, the rotational hydraulic motor 22, the impact hydraulic cylinder 26, the spiral rod 27, and the casing pipe 33, which are fixed to the slide base 19 via the gear box 21, move forward together, and the casing pipe 33 moves forward as a unit. At the same time, the main body frame 17 is guided by a support base 34 fixed to the upper surface of the tip of the main body frame 17.
Diagonal drilling is started by a bit 28 that protrudes from the tip and is attached to the tip of the spiral rod 27. Before starting the oblique drilling, the on-off valve 43a of the air adjustment pulp 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. The air blowing hole 30 of the bit 28 passes through the air hole 27d of the shaft portion 27a,
It will erupt from 30.31.31. and bit 28
Due to the rotation of the spiral rod 27 inserted into the casing pipe 33, the soil drilled by the casing pipe 33 is moved between the spiral rod 27 and the casing pipe 33 like a screw conveyor by the spiral blades 27b of the spiral rod 27,
The soil is sent to the discharge section 32 near the end of the soil discharge section 27b, and is sucked into the dust collector 56 through the air duct 32a, and large clods and the like 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 soil removal can be achieved.

In addition, if the ground changes from the ground surface to a bedrock layer, or if the ground changes 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 operates, piston rod 26a
The hammer 25 fixed at the tip is the variable flow N adjustment valve 5
It makes a reciprocating motion with a small stroke according to the setting in step 1, and transmits the impact force to the base end of the hexagonal shaft 27c of the shaft portion 27a of the spiral rod 27 which is in a rotating state, and the bit 28 at the tip of the spiral rod 27 receives rotation and force. Since the blow is applied in combination with a blow, drilling of the rock layer can be carried out efficiently. At this time, the chips generated by drilling the rock mass pass through the air hole of the spiral rod 27, as in the case above the drilling, and the air blowing holes 30, 30, 31, 3 of the bit 28.
Spiral rod 2 due to the force of the air jetted from 1
7 and the casing pipe 33, and is sucked into the dust collector 56 from the air duct part 32a of the discharge part 32 via the dust collection duct 42.

Furthermore, if it moves from the bedrock layer to the soil layer, the remote control device 4
The drive stop switching valve 50 of 6a is operated to the stop side to stop the operation of the impact hydraulic cylinder 26 and turn the rotation hydraulic motor 22.
The bit 28 at the tip of the spiral rod 27 is made to rotate only by this rotation.

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 backward along the main body frame 17.
Drilling work at one location is completed.

When drilling the next hole, the connecting flange portion 4a of the liner plate 4 at the previous drilling position and the connecting fixing members 11b, 11b at the tip of the fixed base 11 are released, and the connecting fixing members 11b, llb are unfixed. In the circumferential direction of the liner plate 4, move the height adjustment screw 9 around the cylindrical portion 5b of the fulcrum base 5 fitted into the insertion hole 9a, and then attach the connecting flange of the liner plate 4 at the next drilling position. By simply re-fixing the portion 4a and repeating the same operations as described above, drilling can be performed. 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" With the above-described configuration, the present invention eliminates the need to replace tools such as the bit 28 and the spiral rod 27 even when the ground is a soil layer, a rock layer, or an alternating layer of these layers. Since drilling in various types of ground can be performed automatically by remote control without requiring human labor, the work of expanding the foundation excavation does not require heavy labor and the number of workers can be reduced.

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. Each drive part 22.26.3
8 is hydraulically driven, there is no engine or exhaust noise that occurs in conventional engine rock drills or air rock drills, and the impact noise is also reduced because the spiral rod 27 is covered by the casing pipe 33. Work noise is kept low,
The working environment with vibration, dust, noise, etc. is improved.

Furthermore, since the casing pipe 33 is inserted into the spiral rod 27, the excavated soil and chips are transported between the spiral rod 27 and the casing pipe 33 in the form of a screw conveyor or air flow, and do not stagnate in the drilling path. , spiral rod 27 and bit 28
It does not create resistance to rotation and does not make it impossible to drill holes.

It also prevents small pieces of rock from getting caught in the bit shoulder.
Since the straightness of the drilling is maintained and the center of the drilling does not shift, the spiral rod 27 and the bit 28 can be easily pulled out without requiring great force.
Work efficiency can be improved.

[Brief explanation of the drawing]

The attached drawings show an example of the implementation of the present invention, and 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 schematic side view, partially in section, of the main body of the device. Side view,
Figure 3 is an enlarged sectional view of the main part taken along line A-A in Figure 2, and Figure 4 is the same B.
-B line is an enlarged sectional view of the main part, Fig. 5 is a plan view of the main part with the slide base lowered to the lowest end of the main body frame, Fig. 6 is an enlarged sectional view of the main part on the line C-C of Fig. 5, and Fig. 7 is Figure 8 is a side view of the bit, Figure 9 is a front view of the same, and Figure 10 is a partially sectional front view of the important part with the horizontal adjustment device set on the ground. , FIG. 11 is an exploded perspective view of the leveling device, and FIG. 12 is a front view of the remote control console. 1- Center point, 1a- Intermediate ampulla, lb-
・- Center shaft, 2... Bottom plate, 3-... Expanded bottom foundation construction surface, 3
a--Side circumference, 4--liner plate, 4a--connection flange portion, 4b--hole, 5--fulcrum base, 5
a-disk, 5b-cylindrical portion, 6... spherical sliding bearing, 6a
- Outer ring, 6 b - Inner ring, 6 cm shaft hole, 7 - Jack bolt, 7 a - Nut, 8 - Embedded bolt,
8a-nut, 9...height adjustment screw, 9a--fitting hole, lO--height adjustment nut, 11... fixed base, 11a-angle iron, llb... connection fixing member, 1l
c-hole, 12--lower frame, 12 a-angle iron, 12
b, 12C-bearing, 12c-elongated hole, 12 (1-m-bolt, 12e...-nut, 13--fixed base pedestal arm, 13a--fixed base pedestal, 13b--block, 13c--Through hole, 14--Horizontal adjustment device, 1
5--Floating stop bolt, 16... Frame, 17...
Main body frame, 17a...angle iron, 17b, 17cm
-Bearing, 17d--Side, 17e-Bearing, 18-...
Angle adjustment legs, 18a, 18b...angle iron, 18cm
Long hole, 18d-height adjustment bolt, 19...slide base,
19a- hanging plate, 2゜--pressing plate, 20a-adjusting plate,
21... Gear box, 22... Hydraulic motor, 2
2a-rotating shaft, 23--driving gear, 24--driven gear, 24a-shaft hole, 24 b-shaft portion, 24 c--bearing metal, 25-hammer, 25a--rod hole, 26-hydraulic cylinder , 26a - piston rod, 27 - spiral o, 7 do, 27 a - shaft section, 27b - vane,
27c...Hexagonal shaft, 27 d-air hole, 28-bit, 28 a-10-shaped part, 28 b--body part, 28
c-Blade, 29-Carbide tip, 30.31--Air blowout hole, 32-Discharge part, 32a--Air duct part, 32b--Soil discharge port and intake port, 32cm side opening, 33-・-Casing vibe, 33a-base, 34
・-・Support stand, 35-dustproof cap, 35a-・base,
36... Worm reducer, 36a- human power shaft, 36b-
・-output shaft, 37-coupling, 38-hydraulic motor,
38a...-rotating shaft, 39.40-sprocket, 40
a--shaft, 41--chain, 42-dust collection duct, 4
3-air adjustment valve, 43a-opening/closing valve, 44...air inlet, 45--piping, 46-remote control table, 46
a-Remote control device, 47-Forward/reverse rotation switching valve, 48...
Two-way 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, 54a, 55a--Adjustment dial, 56--Dust collector, 56a--Dust collection hose, 57-
...Air compressor, 57a--Air hose, 58--Hydraulic unit, 58a--Hydraulic hose.

Claims (1)

[Claims] 1. Rotation and impact are applied by remote control to a bit that is optimal for various types of ground at the tip of the rod via a spiral rod with a casing, and the number of rotations and impact of the bit can be freely adjusted. The propulsion speed of the bit can be adjusted freely, and the bit is automatically propelled at a constant speed that is not affected by changes in the ground.
The air passing through the center of the rod is injected from the bit in both the digging direction and the opposite direction, and the chips and soil are passed between the spiral rod and the casing, and are sent from the base of the spiral rod to the drilling and the opposite direction. A small-diameter drilling method suitable for various types of ground, characterized by the fact that it is discharged using separate power. 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 periphery of the construction surface of the expanded bottom foundation excavated to the required depth from the ground, and the tip of the fixed base is is removably fixed to a supporting material such as a liner plate, a lower frame is slidably placed on the fixed base, and the tip of the pedestal is rotatably supported at one end of the lower frame. The other end of the frame and the middle part of the pedestal are rotatably supported by telescopic angle adjustment legs, and a slide pedestal that slides on the pedestal is provided, and a rotation drive is provided on the slide pedestal. The rotary drive section and the striking drive section are arranged, and the base end of a spiral rod, which has a bit fixed to the tip with air blowing holes in both the digging direction and the reverse direction, is connected to the rotating drive section and the striking drive section. 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 that moves the slide pedestal forward and backward on the pedestal together with a spiral rod is installed, and each of the drive units can be controlled remotely. This small-diameter milling machine is suitable for various types of ground, and is equipped with a remote control device that controls the speed of the ground.The rotation and number of blows can be adjusted separately to suit the ground, and the propulsion drive can be adjusted at a constant speed. hole device. 3. A spherical surface is installed above the seat plate of the center point near the center of the circular cross-section made up of supporting materials such as liner plates installed on the side of the construction surface of the expanded foundation excavated to the required depth from the ground. Insert the fulcrum base through the sliding bearing, screw the jack bolt that contacts the seat plate into the fulcrum base, rotatably insert the height adjustment screw above the fulcrum base, and insert the height adjustment screw into the fulcrum base so that it can rotate up and down. A fixed base cradle arm is interposed and fixed by screwing in the height adjustment nut, and a fixed base whose tip is removably fixed to the supporting material such as the liner plate is inserted into the fixed base cradle of the arm and fixed. A horizontal adjustment device that levels the base and fulcrum base, a lower frame is slidably and fixably placed on the fixed base, and the tip of the pedestal is rotatably supported at one end of the lower frame. The other end of the lower frame and the middle part of the pedestal are rotatably supported by telescopic angle adjusting legs, and a slide pedestal is provided that slides on the pedestal, and A rotating drive unit and a striking drive unit are arranged, and the base end of a spiral rod, which has a bit fixed at its tip with air blowing holes drilled in both the drilling direction and the reverse direction, is connected to the rotating drive unit and the striking drive unit. A casing pipe with an outer diameter slightly smaller than the bit outer diameter is inserted into the spiral rod, and the base of the pipe is fixed to a discharge part installed at the base end of the spiral rod, and the tip of the pipe is connected to the drive part. is slidably inserted into a support base fixed above the tip of the gantry, and the air duct above the discharge part is connected to a dust collector, and the lower part of the discharge part is used as a discharge port for large lumps, etc. that cannot be sucked up by the dust collector. A dust-proof cap is attached to the tip of the pedestal, which opens as an air intake port to increase dust collection ability, and into which the casing pipe is slidably inserted, and the sliding pedestal is moved forward and backward on the pedestal together with a spiral rod. A remote control device was installed to remotely control each drive unit, and the rotation and number of blows could be adjusted separately according to the ground, and the propulsion drive could be adjusted at a constant speed. A small-diameter drilling device that is suitable for various types of ground. 4. The bit has air blowing holes in both the digging direction and the opposite direction that are continuous with the air hole of the spiral rod, and the bit shape is a cross-shaped blade with the rotation direction side almost vertical, and the tip part is shaped 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 to the bit body 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 a remote control device for each drive unit includes a forward/reverse rotation switching valve and a impact drive unit for at least the rotation drive unit. 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. hole device.