JPH0610394B2 - Drilling method - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention destroys an existing reinforced concrete (RC) or other old skeleton, particularly an underground skeleton, or an object to be drilled such as hard ground such as rock. The present invention relates to a method for drilling or breaking an object to be drilled and drilling to construct a soil cement column pile.

Conventional technology Recently, rebuilding work for aging buildings and functionally deteriorated buildings due to urban redevelopment has been actively carried out.
In many cases, the outer walls of such buildings are built on the boundaries of the site, and in order to carry out reconstruction work after dismantling them,
It is necessary to construct soil column piles for mountain retaining on the outer wall that is the boundary with the existing building.

Conventionally, a hole drilling device called a so-called rock auger is used for drilling an underground reinforced concrete old body or the like such as the outer wall. This drilling device uses a driving device to reversely rotate an outer casing having a bit at the tip and an inner auger screw having an auger head at the tip to perform core-cut-like drilling at the bit of the outer casing and the inner auger head. Due to the synergistic effect of the bit's destructive action, the old skeleton is destroyed and the holes are punched while canceling each other's reaction torque.

The problem to be solved by the invention However, in the drilling method using the conventional drilling device, the auger head of the auger screw is projected beyond the bit of the casing, and the auger head is advanced to drill the old body. There is. The bit of this auger head has a blade inclined at an angle of about 30 degrees with respect to the horizontal plane, so when the destruction of the old body is started, the blade is not stable against the fracture surface and is displaced by the rotation of the auger screw. There is a problem that it is easy, it is difficult to destroy the desired part, and the work efficiency is poor.

The present invention is to solve the problems of the prior art, such as a reinforced concrete old body, or can easily and reliably drill a desired location of the object to be drilled such as hard ground. The object of the present invention is to provide a drilling method capable of improving work efficiency.

Means for Solving the Problems The present invention, in order to achieve the above object, has a casing having a bit at its tip, and is arranged inside the casing.
The auger screw having an auger head at the tip is rotated in the reverse direction by a driving device, and the bit of the casing is projected toward the tip of the auger head by the operation of a hydraulic cylinder, or a drilling device is used that can be retracted. With the bit of the casing protruding toward the tip of the auger head by the operation of the hydraulic cylinder, the casing and the auger screw of the casing are reversely rotated by the drive of the drive device, and the bit at the tip of the casing is made of reinforced concrete. An annular groove is formed in the object to be drilled, such as a frame or hard ground, and then the casing bit is positioned in the groove. The object to be drilled is drilled.

Effect According to the present invention, therefore, the bit of the casing easily and reliably forms an annular groove at a desired position on the fracture surface of the object to be drilled, such as a reinforced concrete old structure or hard ground such as rock. With the casing positioned in the annular groove, the bit of the casing that rotates in the reverse direction and the auger screw cooperate to drill the object to be drilled. And
Since the positional relationship between the bit of the casing and the auger head of the auger screw is controlled by the operation of the hydraulic cylinder, the desired position of the object to be drilled can be easily and reliably obtained.
Moreover, the holes can be drilled quickly.

Examples Hereinafter, examples of the present invention will be described with reference to the drawings.

First, a drilling device used in the drilling method of the present invention will be described.

As shown in FIGS. 2 to 11, the leader mast 2 is vertically supported on the front side of the base machine 1 and
A frame 5 of a drive unit 4 is supported by a guide gib 6 along the guide rail 3 so as to be movable up and down, and the drive unit 4 is suspended by a wire 7. The drive device 4 is a frame 5
A pair of electric motors 8 and 9, speed reducers 10 and 11 for suppressing the number of rotations of the output shaft thereof, and a speed reducer 12 for outputting torque are supported, and a holding device 13 is supported below the speed reducer 12. . Each speed reducer 10, 11 is composed of planetary gear mechanisms 14, 15 (see FIG. 9), and the speed reducer 12 is composed of two sets of reduction gear mechanisms 16, 17 (see FIG. 10). Below the drive device 4, a holding device 18 is supported by a guide gib 19 so as to be able to move up and down along the guide rail 3. A holding device 20 is provided on the front side of the base machine 1.
Is attached. The holding device 18 is provided with a bearing 22 inside a case 21, an outer spline shaft 23 is held by the bearing 22 (see FIG. 11), and a connecting cylinder 24 is provided below the outer spline shaft 23.
The base portion of the cylindrical casing 25 is detachably connected via the, and the lower end portion of the casing 25 is held by the holding device 20 in a rotatable and vertically movable manner. A plurality of cemented carbide bits 26 are attached to the tip of the casing 25 (see FIGS. 4 and 5), and the blade of each cemented carbide bit 26 is the seventh blade.
As shown in the figure, it is set to be substantially perpendicular to the horizontal plane. One end of the inner spline shaft 27 is rotatably linked to the holding device 13, and the other side of the inner spline shaft 27 is axially slidably and integrally rotatably fitted to the outer spline shaft 23 ( 11th
See figure). The gear 2 is attached to the upper end of the inner spline shaft 27.
8 is attached, and the gear 28 is linked to the reduction gear mechanism 16 (see FIG. 10). Therefore, by driving the electric motor 8, the inner spline shaft 27, the outer spline shaft 23, the casing 25, and the like are rotated via the planetary gear mechanism 14 of the reduction gear 10, the reduction gear mechanism 16 of the reduction gear 12, and the gear 28. An auger screw 29 is inserted inside the casing 25, and an upper portion of a hollow shaft 30 of the auger screw 29 is rotatably held by a holding device 13,
A gear 31 is attached to the upper end of the shaft 30 inside the reduction gear 12, and the gear 31 is linked to the reduction gear mechanism 17 (see FIG. 10). An auger head 32 at the tip of the auger screw 29 is detachably connected to the shaft 30.
The auger head 32 has a plurality of carbide heads 33. An injection port 34 is formed at the proximal end of the shaft 30, and a discharge port (simple valve) 35 is provided at the distal end. The injection port 34 is connected to a cement milk pump (not shown) via a hose (not shown). It is connected. Therefore, the auger screw 2 is driven by the drive of the electric motor 9 via the planetary gear mechanism 15 of the reduction gear 11, the reduction gear mechanism 17 of the reduction gear 12, and the gear 31.
9 is rotated in the opposite direction to the casing 24. One end of a large-diameter cylindrical body 36 is fixed to the frame 5 of the drive device 4, one end of a small-diameter cylindrical body 37 is fixed to the holding device 18, and these cylindrical bodies 36 and 37 are fitted so as to be expandable and contractible. . Cylinder 3
A base portion of a hydraulic cylinder 38 is connected to the inside of 6, and a piston rod 38 a of the hydraulic cylinder 38 penetrates the cylindrical body 37 and is connected to a support member 39 of the holding device 18. Therefore, by contracting the piston rod 38a of the hydraulic cylinder 38, the holding device 18, the outer spline shaft 23, the casing 25, etc. are attached to the guide rail 3 as shown in FIGS. 2 and 3 (a) and (b). Rises along,
Carbide bit 26 of casing 25 is auger screw 2
The auger head 32 of 9 is retracted rearward, that is, the tip of the auger screw 29 is projected and exposed. On the contrary, by extending the piston rod 38a of the hydraulic cylinder 38, as shown in FIGS. 4 (a) and 4 (b), the holding device 1
8, the outer spline shaft 23, the casing 25 and the like descend along the guide rail 3, and the cemented carbide bit 26 of the casing 25 makes the auger head 3 of the auger screw 29.
2 is projected, that is, the auger head 32 of the auger screw 29 retracts into the casing 25, and FIG.
The piston rod 38a of the hydraulic cylinder 38 is slightly extended from the states of (a) and (b), or the piston rod 38a of the hydraulic cylinder 38 is slightly contracted from the states of FIGS. As shown in the figure, the holding device 18, the outer spline shaft 23, the casing 25, and the like are slightly lowered or slightly moved up along the guide rail 3, and the cemented carbide bit 26 of the casing 25 is auger screw 29.
The auger head 32 is set so as to be located substantially on the same horizontal plane as the carbide bit 33.

Next, a boring method of the present invention performed when boring an existing reinforced concrete (RC) old underground structure in order to construct a soil cement column pile using the boring device will be described.

First, as shown in FIGS. 1 (a), 3 (a), and (b), the piston rod 38a of the hydraulic cylinder 38 is contracted, and the casing 25 and the like are lifted along the guide rail 3 so that the casing 25 The hard bit 26 is retracted from the auger head 32. Next, while loosening the wire 7, the drive device 4, the casing 25, the auger screw 29, and the like are lowered, and the electric bases 8 and 9 of the drive device 4 are driven as described above, and the speed reducers 10, 11 and 12 are used. Rotating the casing 25 and the auger screw 29 in the opposite direction, and the auger screw 29 and the casing 25 disassemble the demolition glass 40.
Drill a hole. As described above, in the dismantling glass 40 portion, the dismantling glass 40 can be easily broken and drilled by causing the auger screw 29 to precede the casing 25. Next, as shown in FIG. 1 (b) and FIG. 5, the piston rod 38a of the hydraulic cylinder 38 is extended, the casing 25 and the like are lowered along the guide rail 3, and the cemented carbide bit 26 of the auger head 32 is moved. The cemented carbide bit 33 is moved forward, and only the cemented carbide bit 26 of the casing 25 is brought into contact with the old underground structure 41. And the casing 25
The old underground skeleton 4 by the carbide bit 26 with the rotation of
Drill 1 in a ring shape. At this time, since the blades of the carbide bit 26 are arranged substantially at right angles to the horizontal plane (7th
(Refer to the drawing), it is possible to stably drill a desired position without shifting on the old underground structure 41. In this way, the drilling is advanced a little, and the auger head 3 of the auger screw 29 is advanced.
Even in 2, when the destruction of the old underground structure 41 starts, the piston rod 38a of the hydraulic cylinder 38 is slightly contracted, and the piston rod 38a of FIG.
As shown in FIG. 5, the casing 25 and the like are slightly raised so that the cemented carbide bit 26 is replaced by the cemented carbide bit 3 of the auger head 32.
It is located almost on the same horizontal plane as 3. Then, the reinforcing bar can be cut by the carbide bit 26 of the casing 25, the reinforcing bar can be cut by the carbide bit 33 of the auger head 32, or the reinforcing bar cut by the carbide bit 26 by the auger head 32 can be drilled while being rolled into small pieces. it can. In this way, first, the super hard bit 26 of the casing 25 is preceded, and then the super hard bit 26 of the casing 25 and the super hard bit 33 of the auger head 32 are drilled in cooperation with each other at substantially the same level. It is possible to cut the reinforcing bar with the carbide bit 26 and the reinforcing bar with the carbide bit 33 at the same time, concrete and the reinforcing bar can be destroyed small, and the hole can be efficiently drilled while destroying the old underground structure 41. be able to. During this time, when the reinforcing bars are entangled with the tip of the auger screw 29, the inner surface of the casing 25 is pressed against the rotating torque, and the progress of the destruction of the old underground structure 41 is stopped, it is detected by the detecting means.
The wire 7 is driven in the opposite direction to the above, the drive device 4, the casing 25, the auger screw 29 and the like are raised, and the casing 25 and the auger screw 29 are moved to the old underground structure 4
Pull up above 1. Then, as shown in FIGS. 3 (a) and 3 (b), the casing 25 and the auger screw 29 are rotated in the directions opposite to those at the time of drilling, and in the opposite directions, and the piston rod 38a of the hydraulic cylinder 38 is contracted. , The casing 25 and the like are retracted to expose the tip of the auger screw 29. This makes it possible to remove the reinforcing bar entangled in the tip of the auger screw 29. In this way, when the old underground skeleton 41 is drilled and the pine pile or the PC pile 42 exists below it, FIG. 1 (d)
As shown in FIGS. 4 (a) and 4 (b), the piston rod 38a of the hydraulic cylinder 38 is extended, the casing 25 and the like are lowered, and the cemented carbide bit 26 is projected toward the tip of the auger head 32 in the same manner as above. In that state, by rotating the casing 25 and the auger screw 29 in the opposite directions as described above, the holes can be efficiently drilled while being destroyed. When the pine pile is destroyed, the fragments are auger screw 2
Even when the entanglement with 9 causes the rotation torque to increase and the progress of destruction to stop, it can be removed in the same manner as in the case of the reinforcing bar. In addition, when there are no pine piles, PC piles 42, etc., drilling is performed in the ground. At the time of drilling these holes, the drilling liquid such as poorly mixed cement milk supplied from the pressure feeding device to the inlet 34 of the auger screw 29 through the pressure feeding pipe is discharged from the discharge port 35 to frictionally heat the casing 25 and the auger screw 29. (The cooling air may be blown out instead of the drilling liquid.) After constructing a soil cement column after drilling as shown in Fig. 1 (e), poor mixture etc. supplied to the inlet 34 of the auger screw 29 from the pressure feeding device via the pressure feeding pipe. The cement milk 43 of No. 1 is discharged from the discharge port 35, the electric motors 8 and 9 are driven in the opposite direction, and the casing 25 is driven through the speed reducers 10, 11 and 12.
The wire guide 3 is driven by driving the wire 7 while rotating the auger screw 29 and the auger screw 29 in the opposite directions.
The soil cement column 44 can be constructed as shown in FIG. 1 (f) by pulling it up along the hole. By repeating this operation in order, a soil cement column pile can be constructed. At this time, a stress material such as H-shaped steel may be inserted into the soil cement column 44 as needed.

It should be noted that concrete fragments and rebar fragments that are destroyed during drilling can also be used as aggregates. Further, when making a deep hole, the casing 25 and the shaft 30 may be added.

EFFECTS OF THE INVENTION As described above, according to the present invention, a casing bit is used to easily and surely form an annular shape at a desired position on a fracture surface of a hole to be drilled, such as a reinforced concrete skeleton or a hard ground such as rock. The groove is formed and the casing is positioned in the annular groove, and the object to be drilled is drilled by the cooperation of the bit of the casing which rotates in the reverse direction and the auger screw. Since the positional relationship between the bit of the casing and the auger head of the auger screw is controlled by the operation of the hydraulic cylinder, it is possible to easily, surely, and quickly drill a desired position on the object to be drilled. You can Therefore, the work efficiency can be improved.

[Brief description of drawings]

1 (a) to 1 (f) are schematic explanatory views showing a drilling method in one embodiment of the present invention, and FIGS. 2 to 11 show a drilling device used in the drilling method of the present invention. Fig. 2 is a schematic side view of the whole, Fig. 3 (a) is an enlarged side view of a part of a main part in a state where the casing is raised so that a bit of the casing is located behind an auger head of an auger screw, FIG. 4B is a partial front view of FIG. 4A, and FIG. 4A is a partially cutaway enlarged side view of a main part of the casing in which the casing bit is lowered so that the casing bit is located ahead of the auger head. Same figure
(b) is a partial front view, and Fig. 5 is an enlarged partial cutout of the main part with the casing positioned in the middle so that the casing bit is located on substantially the same horizontal plane as the auger head bit. FIG. 6 is a side view, FIG. 6 is an enlarged view of the casing and the tip portion of the auger screw with a part thereof being cut away, and FIG. 7 is an enlarged perspective view of the tip portion of the casing, FIG. 8, FIG. Are VIII-VIII arrows and IX-IX in Fig. 4 (b), respectively.
It is sectional drawing of arrow view, XX arrow view, and XI-XI arrow view. 1 ... Base machine, 2 ... Leader mast, 3 ... Guide rail, 4 ... Drive device, 7 ... Wire, 8, 9 ... Electric motor, 1
0, 11, 12 ... Reducer, 25 ... Casing, 26 ... Carbide bit, 29 ... Auger screw, 32 ... Auger head, 33 ... Carbide bit, 35 ... Discharge port, 38 ... Hydraulic cylinder, 41 ... Old underground structure (Object to be drilled), 42 ... pine pile, PC pile, 43 ... cement milk, 44 ... soil cement pillar.

Claims (1)

[Claims] 1. A casing having a bit at its tip and an auger screw disposed inside the casing and having an auger head at its tip are reversely rotated by a driving device, and the bit of the casing is moved by the operation of a hydraulic cylinder. Using a drilling device that can be projected or retracted toward the tip of the auger head, the bit of the casing is projected toward the tip of the auger head by the operation of the hydraulic cylinder, and the driving device drives Reverse the casing and auger screw,
The bit at the tip of the casing forms an annular groove in the object to be drilled, such as a reinforced concrete old body or hard ground, and then with the casing positioned in the groove, reverse rotation as described above. A drilling method characterized in that the object to be drilled is drilled in cooperation with a casing bit and an auger screw.