JPH10331562A - Method and device for drilling large-bore vertical hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large-bore vertical hole drilling method that provides good operating efficiency, whereby a large-bore hole can be drilled at a time even in the reinforced concrete of an existing underground structure or in ground where boulders or bedrock may exist. SOLUTION: A second rotary casing 2 is installed in a position outside a rock auger 8 having a first rotary casing 6 on its outer periphery and having a screw 7 placed inside it, the screw 7 having a drilling head 7a provided at its end. The first and second rotary casings 6, 2 are made different in their rotating and drilling directions, and the screw 7 is rotated in the same direction as the second rotary casing 2 to drill the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for drilling a large-diameter vertical hole.

[0002]

2. Description of the Related Art For example, when drilling a large-diameter shaft for drilling a pile hole, the drilling diameter is limited with a normal earth auger or the like, so a large-diameter casing having a diameter of about 1000 to 1500 mm is required. used.

[0003] Such a large-diameter casing is inserted into the ground while rotating, and the ground is dug into a core. Thereafter, the inside of the casing is excavated and excavated by an excavator / discharger such as a clamshell bucket.

[0004] In this case, if the existing underground structure reinforced concrete, boulders, bedrock, etc., is present in the ground inside the casing, the casing is excavated in a core shape, but the ground is excavated with a clamshell bucket or the like. Drilling inside the casing with a machine can be difficult.

Therefore, core digging with the casing is performed a plurality of times while wrapping while shifting the position little by little, and then, even at the position inside the casing to be built, the reinforced concrete or the boulder rock of the underground structure is cut with the special cutting teeth at the tip of the casing. After that, the casing is built, and the inside of the casing is excavated with an excavator such as a clamshell bucket.
I try to excavate.

[0006]

In the case of drilling a large-diameter vertical hole, a plurality of cores must be dug by using a casing as described above. Therefore, drilling requires a lot of time and labor to improve work efficiency. Did not.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to provide a large-diameter vertical hole which can drill a large-diameter hole at one time even in a ground where an existing underground structure has reinforced concrete or boulder rock, etc. An object of the present invention is to provide a hole drilling method and apparatus.

[0008]

According to the present invention, in order to achieve the above object, first, as a method of drilling a large-diameter vertical hole, a first rotating casing is arranged on the outer periphery and a tip is provided inside the first rotating casing. A second rotary casing is installed at an outer position of a rock auger provided with a screw provided with a drilling head, the first rotary casing and the second rotary casing have different rotary drilling directions, and the screw has a second rotary casing. The purpose is to excavate the ground by rotating the rotary casing in the same direction as the rotary casing.

Second, the rock auger and the second rotary casing are excavated simultaneously, or the rock auger and the second rotary casing allow the second rotary casing to be excavated first, and then the second rotary casing is excavated. Thirdly, after the rock auger is pulled up, the remaining soil in the second rotating casing is removed from the earth removal bucket such as a clamshell bucket by the second rotation casing. The gist of the invention is that it is put in a rotating casing and removed.

As a drilling device for a large-diameter vertical hole, a lock in which a first rotary casing is arranged on the outer periphery, a drilling head is provided inside the first rotary casing, and a screw having a different rotation direction from the first rotary casing is provided. A combination of the auger, the first rotating casing disposed outside the lock auger, and a second rotating casing having a different rotation direction, and the second rotating casing locking its peripheral surface. The gist of the invention is that the rotating machine that rotates the entire circumference is a driving device, and the upper end is an open end.

According to the first and fifth aspects of the present invention, a rock auger is used to easily break even an existing underground structure, such as reinforced concrete, a boulder, a rock, or the like. Then, it can be excavated, and the diameter is limited in the rock auger,
By arranging the second rotary casing having a large diameter at the outer position, the excavation diameter of the rock auger can be increased to the excavation diameter of the second rotary casing. Pits of large diameter can be excavated efficiently while protecting the pit.

According to the second aspect of the present invention, the ground is simultaneously excavated by the combination of the second rotating casing and the rock auger, in addition to the above-mentioned operation. It can be easily drilled on the ground where there exists by a single excavation work.

According to the third aspect of the present invention, first aspect is provided.
In addition to the operation of the invention described, in order to dig the inside of the second rotary casing with a rock auger after the second rotary casing is preliminarily excavated, the second rotary casing is built into the ground. After removing heavy equipment, a rock auger machine can be set, making it easy to work in narrow places.

According to the fourth aspect of the present invention, in addition to the above-described operation, even if there is a gap between the first rotary casing and the second rotary casing, the remaining soil at this location is removed after the rock auger is pulled up. It can be removed with a dumping bucket.

According to the present invention described in claim 6, according to claim 5,
In addition to the operation of the present invention described above, the second rotating casing is a driving device that is a full-circular rotating machine that locks and rotates its peripheral surface, and the upper end is an open end. The rock auger can be arranged, and it is easy to excavate the second rotating casing and the rock auger simultaneously.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway front view showing an embodiment of a method and apparatus for drilling a large-diameter vertical hole according to the present invention.
A lock auger 8 having a first casing 6 having a large diameter, a drilling head 7a provided at the tip inside the first casing 6, and a screw 7 having a rotation direction different from that of the first rotating casing 6; Thickness at the outer position of
This is a combination of the first rotary casing 6 having a diameter of about 50 mm and a diameter of 2000 mm and the second rotary casing 2 having a different rotation direction.

The second rotary casing 2 cuts the ground by using a crawler type excavator 1 or a fixed type excavator as shown in FIG. 1 is an example in which a crawler type heavy machine 3 is provided with a leader mast 4 by a hydraulic cylinder 12 so as to be vertically movable,
The leader mast 4 is provided with a driving device 5 composed of a motor and a speed reducer.
Of the rotary casing 2 is connected to a rotary machine 14 via a chuck device 13. On the other hand, the rock auger 8 connects the auger to the earth auger machine 9 as shown in FIG. Note that the locking of the peripheral surface of the second rotary casing 2 may be performed by using a locking mechanism such as a bolt instead of the chuck device 13.

In the first embodiment, the excavation method using the combination of the rock auger 8 and the second rotary casing 2 is such that the rock auger 8 is inserted into the second rotary casing 2 from the open end at the upper end. Second rotating casing 2
And rock auger 8 are combined to start excavation simultaneously as a double casing.

In this case, when the leader mast 4 is lowered by the hydraulic cylinder 12 and the driving device 5 is driven to rotate the full-circle rotating machine 14, the second rotating casing 2
Presses the ground with the cutter 2a attached to the tip while rotating. After the second rotary casing 2 has been driven in for a predetermined length, the chuck device 13 is replaced upward, and the second rotary casing 2 is driven in again.

On the other hand, as shown in FIGS. 1 and 4, the rock auger 8 is formed by cutting and cutting the ground with a cutter 6a having a carbide tip attached to the tip of both the first rotary casing 6 and the screw 7, and a cutting head 7a. As shown in FIG. 3, excavation is performed simultaneously by the earth auger machine 9 to destroy reinforced concrete, boulder rock and the like of the existing underground structure in the ground in the second rotary casing 2.

Since the outer wall of the rock auger 8 is protected by the second rotary casing 2 which is excavated at the same time, the rock auger 8 can easily perform the pressing and cutting without fear of collapse of the surrounding ground. , The first of rock auger 8
The double casing of the rotating casing 6 and the second rotating casing 2 allows a large-diameter pit to be excavated at a time.

As described above, the second rotary casing 2
When the inner ground is pressed and cut, the rock auger 8 is removed from the second rotary casing 2. The excavated earth and sand in the first rotary casing 6 is simultaneously discharged by raising the rock auger 8. Then, as shown in FIG. 5, the excavated earth and sand remaining in the gap between the first rotary casing 6 and the second rotary casing 2 is discharged by a dumping bucket such as a clamshell bucket 11 using a heavy machine such as a crane 10 as shown in FIG. To soil.

In this case, for example, if the diameter of the second rotary casing 2 is 2000 mm and the diameter of the first rotary casing 6 is 1500 mm as described above, the second rotary casing 2 and the first rotary casing 6 are The earth and sand in the gap between
Will be left on the inner wall portion inside the second rotating casing 2 after the rotating casing 6 is pulled up, but if the outer diameter of the first rotating casing 6 is made equal to the inner diameter of the second rotating casing 2, the first Since there is no gap between the second rotary casings 6, 2, no earth and sand remains at this portion.

In the first embodiment, the second rotary casing 2 and the rock auger 8 are simultaneously driven to excavate with the double casing. However, in the second embodiment, after the second rotary casing 2 is driven, It is also possible to excavate the inside of the second rotary casing 2 with the rock auger 8 as a step, and this is effective in a construction place where the excavator 1 and the earth auger machine 9 cannot be installed at the same time.

[0025]

As described above, the method for drilling a large-diameter hole according to the present invention is capable of drilling a large-diameter vertical hole at once even in the ground where reinforced concrete, boulders, rocks, etc. of an existing underground structure exist. It is efficient.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a method for drilling a large-diameter hole according to the present invention.

FIG. 2 is a front view of a large-diameter casing in a pressed state, showing an embodiment of a method for drilling a large-diameter hole according to the present invention.

FIG. 3 is a side view showing an excavation state by a rock auger showing an embodiment of a method for drilling a large-diameter hole according to the present invention.

FIG. 4 is a partially cutaway front view of a rock auger used in the method for drilling a large-diameter hole according to the present invention.

FIG. 5 is a front view showing an embodiment of a method for boring a large-diameter hole according to the present invention, showing a soil discharging state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Excavator 2 ... 2nd rotating casing 2a ... Cutter 3 ... Heavy machine 4 ... Leader mast 5 ... Drive device 6 ... 1st rotating casing 6a ... Cutter 7 ... Screw 7a ... Excavating head 8 ... Rock auger 9 ... Earth auger Machine 10 ... Crane 11 ... Clamshell bucket 12 ... Hydraulic cylinder 13 ... Chuck device 14 ... Rotary machine

Claims (6)

[Claims] 1. A first rotating casing is provided at an outer position of a rock auger having a first rotating casing disposed on an outer periphery thereof and a screw provided with a cutting head at its tip inside the first rotating casing. A drilling method for a large-diameter shaft, wherein the casing and the second rotary casing have different rotation excavation directions, and the screw is rotated in the same direction as the second rotary casing to excavate the ground. 2. The method according to claim 1, wherein the rock auger and the second rotary casing are excavated simultaneously. 3. The rock auger and the second rotating casing allow the second rotating casing to be pre-drilled,
The method for drilling a large-diameter vertical hole according to claim 1, wherein the inside of the second rotary casing is excavated with a rock auger. 4. The method according to claim 1, wherein after the rock auger is lifted, the remaining soil in the second rotating casing is removed by putting a dumping bucket such as a clamshell bucket into the second rotating casing. Drilling method for large diameter pits. 5. A lock auger having a first rotary casing disposed on an outer periphery thereof, a drilling head provided at a tip thereof inside thereof, and a screw having a rotation direction different from that of the first rotary casing, and an outer position of the lock auger. A drilling device for a large-diameter vertical hole, wherein the first rotary casing disposed in the first rotary casing and a second rotary casing having a different rotation direction are combined. 6. The drilling device for a large-diameter vertical hole according to claim 5, wherein the second rotary casing is a driving device that is a full-circular rotating machine that rotates while locking a peripheral surface thereof, and an upper end is an open end.