JPH1018754A - Large bore hole excavating construction method and hole excavating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate formation of a large bore hole by excavating a plurality of pilot holes in the ground, inserting a guide rod in each pilot hole, forming unit excavated holes, larger than the advance pilot holes, in the ground with the guide rods as guide, and communicating these unit excavated holes with one another to form one target excavated hole with a large bore. SOLUTION: A plurality of pilot holes 6 are formed in the ground 1 by a boring machine 3. A guide rod 7 is inserted in each advance hole 6. The boring machine 3 is then removed to install a derrick device 17, and with the guide rods 7 as guide, unit excavated holes 86 larger than the pilot holes 6 are respectively formed in the ground. These unit excavated holes 86 are communicated with one another to form one target excavated hole 80 with a large bore. The target excavated hole with a large bore can thereby be obtained easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-diameter hole drilling method and a hole drilling apparatus suitable for drilling a shaft (vertical hole) having a large hole diameter and a large depth.

[0002]

2. Description of the Related Art The present inventor has previously described Japanese Patent Application No. 7-1074.
In No. 64, excavated an advanced hole having a smaller hole diameter than the excavation target hole in the ground, inserted a guide rod into this advanced hole,
An excavator having an excavator for excavating the ground, rotating means for rotating the excavator, propulsion means for propelling the excavator, and fixing means for fixing the main body to the ground is mounted on the guide rod. In this state, a rotating means of the excavator, a propulsion means, and a fixing means are selectively operated, and a drilling method for propelling a drilling tool along the guide rod to drill a corresponding drilling target hole, And a hole drilling rig was proposed.

In this prior art, excavation proceeds in the direction of extension of the guide rod, so that the posture of the excavator in the horizontal plane is hardly required to be adjusted. There is an advantage that it is possible to excavate a hole having a higher degree of verticality with higher working efficiency than the technology.

[0004]

The prior art proposed by the inventor of the present invention has a large diameter of 3 to 4 m.
It is possible to excavate holes up to about
It is not suitable for excavation of larger diameter holes exceeding m. That is, in order to realize excavation of a hole having a diameter exceeding 4 m, the structure of a drilling rig including an excavator must be designed to be even larger. The shape and weight of the members are increased, making them difficult to handle, making it difficult to transport them to, for example, an excavation site in the mountains, which is not practical.

The present invention has been made in view of the above-mentioned situation in the prior art, and has as its object the purpose of the present invention in that the ground has a diameter of 4 mm.
An object of the present invention is to provide a large-diameter hole excavation method and a hole excavation apparatus capable of easily forming a large-diameter hole exceeding m.

[0006]

In order to achieve the above-mentioned object, a large-diameter hole drilling method according to claim 1 of the present invention excavates a plurality of advanced holes in the ground, and guides each of these advanced holes. A rod is inserted, unit drilling holes larger than the advanced hole are respectively formed in the ground using the guide rods as guides, and these unit drilling holes are connected to each other to form one large-diameter drilling target hole. It is like that.

In the invention according to claim 1, for example, a plurality of unit excavation holes having a diameter smaller than 4 m may be provided so as to be connected to each other by using the above-described excavator according to the prior art of the present inventor. A circular hole, that is, a large-diameter excavation target hole having a diameter exceeding 4 m can be obtained in a space formed by the communication of these unit excavation holes.

Further, according to the second aspect of the present invention, there is provided a large-diameter hole excavation method according to the first aspect of the present invention, wherein the corresponding unit excavation holes are formed in the ground located between the adjacent unit excavation holes. Are formed so as to communicate with each other.

According to the second aspect of the present invention, since a molding hole is formed in the ground between adjacent unit excavation holes, the above-mentioned excavation target hole is formed into a more accurate circular hole, that is, a circular hole with less unnecessary ground excavation. It can be.

According to a third aspect of the present invention, there is provided the large-diameter hole excavation method according to the first or second aspect, wherein the excavator for forming the unit excavation hole includes an excavator for excavating the ground. Rotating means for rotating the digging tool, propulsion means for propelling the digging tool, and fixing means for fixing to the guide rod, wherein the digging tool is fixed to the guide rod with the fixing means. The drilling tool is propelled along the guide rod by the propulsion means while being rotated by the rotation means to form the unit drilling hole.

According to the third aspect of the present invention, the reaction force at the time of excavation can be taken by the guide rod for guiding the excavator, and the swing of the excavator at the time of excavation can be restricted. . Therefore, the excavator can be excavated along the extension direction of the guide rod, and it is possible to suppress the misalignment of the center of the excavator with respect to the center of the unit excavation hole and the occurrence of the inclination of the excavator.

A hole drilling apparatus according to a twelfth aspect of the present invention is used for forming a large diameter drilling target hole formed by connecting a plurality of unit drilling holes to the ground, and the unit drilling hole is to be formed. A first excavator forming an advanced hole located at the center of the region, a guide rod inserted into the advanced hole, and a second excavator guided by the guide rod to form the unit drill hole larger than the advanced hole. And two excavators.

According to a thirteenth aspect of the present invention, in the hole drilling apparatus according to the twelfth aspect, the second excavator includes a stationary part which can be fixed to the guide rod, And a moving portion movable along the longitudinal direction of the guide rod, and the stationary portion has
The stationary unit is provided with fixing means for fixing the stationary unit to the guide rod, and the moving unit includes an excavating tool for excavating the ground, and a rotating unit for rotating the excavating tool. In between, a propulsion means for propelling the excavating tool is provided.

According to a fourteenth aspect of the present invention, there is provided the hole excavator according to the thirteenth aspect, wherein the moving part includes a non-rotating part that is restricted from rotating around the guide rod. A rotating portion provided below the rotating portion and rotatable around the guide rod; the rotating means is provided on the non-rotating portion; and the excavating tool is provided on the rotating portion.

In the inventions according to the twelfth, thirteenth and fourteenth aspects, the second excavator may be provided so as to connect a plurality of unit excavation holes each having a diameter smaller than 4 m. In the space formed by the communication between the holes, a circular hole, that is, a large-diameter excavation target hole having a diameter exceeding 4 m can be obtained.

According to a thirteenth aspect of the present invention, there is provided the hole drilling apparatus according to the thirteenth aspect, wherein the discharging means for discharging earth and sand generated by excavation of the ground with a drilling tool to the outside of the ground is provided by: The earth drill bucket, which is the above-mentioned drilling tool, also serves as the drilling tool.

In the invention according to claim 22, an earth drill bucket for excavating the earth and sand can be used for discharging the excavated earth and sand, no special earth discharging means is required, and the guide rod is used as a guide for the second excavator. The lifting speed of the earth drill bucket can be made relatively high.

According to a twenty-eighth aspect of the present invention, there is provided the hole drilling apparatus according to the twelfth aspect, wherein the turret holds a guide rod on which the second excavator is mounted on the ground. Is provided.

In the invention according to claim 28, since the guide rod on which the second excavator is mounted is held by the turret apparatus, a reaction force during excavation when excavating a unit excavation hole by the second excavator is obtained. Can be taken by the turret device, and the guide rod has a small swing and a stable unit excavation hole can be formed.

According to a thirty-first aspect of the present invention, there is provided the drilling apparatus according to the twenty-eighth aspect, wherein the advanced drill hole other than the guide rod on which the second excavator is mounted is mounted on the tower apparatus. The other guide rod to be inserted is fixed.

According to the thirty-first aspect of the present invention, a reaction force during excavation can be taken by another guide rod, and a more stable unit excavation hole can be formed.

In the hole drilling apparatus according to claim 32 of the present invention, in the invention according to claim 28, a gondola is arranged in the tower apparatus, the gondola can be lifted and lowered, and the tower apparatus can be lifted and lowered. Is provided so as to be movable in the horizontal direction with respect to

In the invention according to claim 32, when a boulder occurs in a unit excavation hole, equipment and a worker can be loaded into the gondola to cope with the processing of the boulder, and the gondola is lifted by using a guide rod as a guide. Since the lifting is performed, the lifting speed can be relatively increased.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a large-diameter hole drilling method and a hole drilling apparatus according to an embodiment of the present invention.

FIGS. 1 to 4 are views for explaining one embodiment of the large-diameter hole excavation method of the present invention, and FIG. 5 is an excavation target obtained by one embodiment of the large-diameter hole excavation method shown in FIGS. FIG. 6 is a plan view showing a first example of a hole to be drilled, FIG. 6 is a plan view showing a second example of a hole to be drilled obtained by the above embodiment, and FIG. 7 is a third example of a hole to be drilled obtained by the above embodiment. FIG.

In this embodiment, as will be described later, the ground 1
In order to form an excavation target hole 80 having a large diameter, a plurality of unit excavation holes 86 having a smaller diameter than the excavation target hole 80 are formed continuously. For this purpose, a plurality of advanced holes 6 having a smaller diameter than the unit excavation holes 86 are first formed, and the guide rods 7 are inserted into these advanced holes 6. The unit excavation holes 86 are formed in the ground 1 using the guide rods 7 as guides. The unit excavation holes 86 are communicated with each other to obtain one excavation target hole 80.

In performing such a hole excavation, a molding hole 81 for allowing the corresponding unit excavation holes 86 to communicate with each other is formed in the ground 1 located between the unit excavation holes 86 to be formed adjacent to each other. It is formed.

Hereinafter, this embodiment will be described in detail with reference to FIGS. FIGS. 1A to 1D are diagrams illustrating a preparation operation. First, as shown in FIG. 1A, an operation of driving a retaining fence 82 into a sloped ground 1 in a mountain area, for example, is performed. Next, as shown in (b) of FIG. 1, a leveling operation for leveling the planned excavation area 83 is performed. Next, as shown in FIG.
A jib crane 84 is installed in the vicinity of. Next, as shown in (d) of FIG. 1, the boring machine 3 constituting the first excavator for forming the advanced hole 6 described later is installed in the excavation area 83 by using the jib crane 84. The first excavator includes a down-the-hole drill 85 for drilling the advanced hole 6 (see (e) in FIG. 2) and the boring machine 3 for rotating the down-the-hole drill 85.
And a compressor that is a driving source of the down-the-hole drill 85. A first excavator having such a down-the-hole drill 85 is known, and is disclosed in Japanese Patent Application Laid-Open Nos. 3-119284 and 63-31497.

In the prepared state, a plurality of advanced holes 6 and forming holes 81 are formed in the ground 1 in the excavation area 83. That is, as shown in FIG. 2E, the boring machine 3 is operated to supply air from the compressor to the down-the-hole drill 85, and the down-the-hole drill 85 forms a plurality of advanced holes 6 in the vertical direction. At this time, the guide rod 7 may be inserted into the advanced hole 6 at the same time as the excavation of the advanced hole 6, or the down-the-hole drill 85 is once pulled out of the ground 1 from the formed advanced hole 6, and then the guide rod 7 is removed. May be inserted into each of the advanced holes 6. The earth and sand generated by excavation of the advanced hole 6 is, for example, by blowing air generated by the above-described compressor to the excavated portion,
The soil is discharged outside the ground 1. Further, using the boring machine 3 described above, a molding hole 81 for communicating the corresponding unit excavation holes is formed in the ground 1 located between the unit excavation holes to be formed adjacent to each other. (A) of FIG.
The advanced hole 6 and the advanced hole 6
2 shows an arrangement relationship between the guide rod 7 inserted into the molding hole 81 and the molding hole 81. In FIG. 5A, advanced holes 6 are formed at each of the vertexes and the center of the hexagon, and a guide rod 7 is inserted into these advanced holes 6. Further, the molding holes 81 are formed at six places. In addition,
In (e) of FIG. 2 described above, the portion indicated by 1a in the ground 1 is a soft rock layer whose soil is relatively soft, and the portion indicated by 1b is a hard rock layer whose soil is hard.

Next, as shown in FIG. 2F, the boring machine 3 is removed using a jib crane 84 or the like.
The turret device 17 is installed on the guide rod 7 located at the center of FIG. 5A, and the second excavator 9 that forms the unit excavation hole 86 is attached to the corresponding guide rod 7, and the turret device 17 is mounted.
Equipped with a movable gondola 8. The tower device 17
Has a winch 18.

The second drilling machine 9 includes a drilling tool for drilling the ground 1, for example, an earth drill bucket 10 suitable for drilling the soft rock layer 1a, a rotating means for rotating the earth drill bucket 10, and an earth drill bucket. And a fixing means for fixing the ground drill bucket 10 to the guide rod 7 while the earth drill bucket 10 is being rotated by the rotating means while being fixed to the guide rod 7 by the fixing means. Is vertically propelled along the guide rod 7 by the propulsion means, so that a desired unit excavation hole 86 is formed.

That is, as shown in FIG. 2G, the second excavator 9 is fixed to the guide rod 7 by the fixing means and excavated for a predetermined distance by the earth drill bucket 10, and once the second excavator 9 The excavator 9 is stopped, the fixing by the fixing means is released, the second excavator 9 is detached from the guide rod 7, and the second excavator 9 is guided by the guide rod 7 by a distance corresponding to the above-mentioned predetermined distance. Move
At the moved position, it is fixed to the guide rod 7 again by the fixing means, and the earth drill bucket 10 excavates again for a predetermined distance. The earth and sand generated by the excavation is deposited in the earth drill bucket 10. Therefore, the second excavator 9 is lifted by the winch 18 using the guide rod 7 as a guide, so that the earth and sand in the earth drill bucket 10 can be discharged to the outside of the unit drilling hole 86. That is, the earth drill bucket 10 can also be used as a discharging means. Hereinafter, the same operation is repeated until the entire length of the corresponding excavation hole 86 is formed.

During the formation of the unit drilling hole 86, there is a boulder 91 in the unit drilling hole 86 being drilled.
In the case where the excavation work is hindered, FIG.
As shown in FIG. 5, the second excavator 9 is temporarily lifted by the winch 18 of the tower device 17 with the guide rod 7 serving as a guide, and the second excavator 9 is removed outside the unit excavation hole 86. 8 in the horizontal direction.
Then, a predetermined equipment and an operator are put on the equipment, and the guide rod 7 is hung in the unit excavation hole 86 as a guide, and the operator removes the boulders 91 in the unit excavation hole 86 using the equipment.

During the excavation work of the unit excavation hole 86, as shown in FIG.
, The boring machine 3 is installed again on the unit drilling hole 86 being drilled, and the down-the-hole drill 85 is driven so as to communicate with the unit drilling hole 86, and the hard rock layer 1 is driven.
Excavation hole 88 for temporarily containing hard rock generated by excavation b is excavated. In this state, the drilling tool of the second drilling machine 9 is
, A roller bit 10b suitable for hard rock excavation.

As shown in FIG. 3 (N), except for the boring machine 3, the second excavator 9 is mounted on the guide rod 7 again, and the second excavator 9 is driven in the same manner as described above. The excavation work of the unit excavation hole 86 of the hard rock layer 1b is continued. During this excavation operation, excavated earth and sand accumulates in the earth discharging hole 88. In order to remove the sediment deposited in the discharge hole 88 as described above,
As shown in FIG. 3 (L), the second excavator 9 is once removed to the outside of the unit excavation hole 86, and a rock gripper, that is, a hammer grab 90 is attached to the tip of the jib crane 84. As shown by a two-dot chain line, the jib crane 84 is driven so that the hammer grab 90 enters the earth discharging hole 88,
The excavated earth and sand in the earth discharging hole 88 is gripped by the hammer grab 90 and taken out to the outside.

In this manner, the first unit excavation hole 86 which is a vertical hole having a diameter of, for example, 3.7 m can be formed in the ground 1. After the formation of the first unit borehole 86,
The second excavator 9 is detached from the guide rod 7, the second excavator 9 is lifted by the winch 18 using the guide rod 7 as a guide, and is removed to the outside of the first unit excavation hole 86. Outside of this, the drilling tool of the second drilling machine 9 is replaced with, for example, an earth drill bucket 10 for soft rock drilling.

In the same manner, the second to seventh unit drilling holes 8
6, the second and subsequent unit drilling holes 86 are connected to the unit drilling hole 86 formed first, that is, are provided so as to communicate with each other. Therefore, as shown in FIG. The unit excavation hole 86 also serves as an excavation hole. Therefore, in forming the second and subsequent unit excavation holes 86, it is not necessary to provide an excavation hole. To be removed.

In the above description, the excavated earth and sand is discharged by the hammer grab 90. However, the earth and sand may be discharged using air pressure or water pressure, that is, air or water.

FIG. 4 (a) shows a state immediately after the seven unit excavation holes 86 are formed as described above.

From this state, as shown in FIG. 4F, when the guide rods 7 are sequentially pulled out and removed from the respective unit excavation holes 86, that is, the outside of the excavation target holes 80, FIG. As shown, seven unit drill holes 86
And one large diameter formed by connecting the six molding holes 81,
For example, an excavation target hole 80 having a diameter of 8 m can be formed in the ground 1. FIG. 5B shows the ground 1 at this time as viewed from above, and the area surrounded by the dotted line is the excavation target hole 8.
0. When removing the guide rods 7 described above, the guide rods 7 may be divided inside the respective unit excavation holes 86, that is, the excavation target holes 80, and then removed outside.

When it is desired to make the excavation target hole 80 with a diameter of 10 m larger than that described above, for example, as shown in FIG. An advanced hole 6 is formed at each of the vertices of the square included in the octagon, and a guide rod 7 is inserted into each of these 12 advanced holes 6. The second excavator 9 is attached to these guide rods 7 as described above,
Twelve unit drill holes 86 are formed. This unit borehole 86
Is set to, for example, a diameter of 3.7 m. Also, the ground 1 between each of the eight unit drilling holes 86 located on the outside,
Ground 1 at the center of the four unit drilling holes 86 located inside
Then, forming holes 81 are respectively formed. Thus, the space surrounded by the dotted line in FIG.
m excavation target holes 80 can be formed.

When it is desired to set the diameter of the excavation target hole 80 to 6 m smaller than the above, as shown in FIG. 7A, for example, an advanced hole 6 is formed at each of the apexes of a square, and these four holes are formed. The guide rod 7 is inserted into each of the two advanced holes 6. The second excavator 9 is attached to these guide rods 7 as described above, and four unit excavation holes 86 are formed. The unit excavation hole 86 is set to, for example, a diameter of 3.7 m. Further, forming holes 81 are formed in the ground 1 between the adjacent unit excavation holes 86, respectively. As a result, a space surrounded by the dotted line in FIG. 7B, that is, the excavation target hole 80 having a diameter of 6 m can be formed.

In the above description, the method of forming the excavation target hole 80 composed of a vertical hole in the ground 1 has been described, but the excavation target hole composed of the horizontal hole extending in the ground 1 in the horizontal direction is also used. It can be formed by using a machine 9 or the like and by connecting a plurality of unit excavation holes 86 in a row.

In the above description, after the formation of the excavation target hole 80,
Although the second excavator 9 and the guide rod 7 are removed from the excavation target hole 80, in the case where there is no obstacle to a structure inserted into the excavation target hole 80, these second excavator 9 and the guide rod 7 are removed. 2 excavator 9 and guide rod 7
, And may be buried in the ground 1 together with the structure to be inserted into the excavation target hole 80.

In the present embodiment described above, a plurality of unit excavation holes 86 having a diameter smaller than 4 m are formed so as to communicate with each other, so that a large-diameter excavation target hole 80 having a diameter exceeding 4 m can be easily obtained. be able to. In particular, the formation of the unit excavation hole 86 requires a relatively small and lightweight second excavator 9 in which the diameter of the excavation hole that can be transported by ordinary transportation means is 4 m or less in consideration of the shape, weight, and the like. Since it can be used, formation of drilling target holes 80 for power transmission tower foundation construction in mountainous areas, formation of drilling target holes 80 for bridge foundation construction, formation of drilling target holes 80 for landslide prevention pile construction, heavy equipment It is suitable for forming an excavation target hole 80 at a site where it is difficult to carry in, and is rich in practicality.

The guide rod 7 is provided with a unit drill hole 86.
Since the diameter of the hole drilling device can be small enough to be inserted into the advanced hole 6 smaller than the diameter of the hole drilling device, this also contributes to downsizing and lightening of the overall shape of the hole drilling device used.

Since the molding hole 81 is formed in the ground 1 between the adjacent unit excavation holes 86, the excavation target hole 80
Can be a highly accurate circular hole, that is, a hole that is closer to a circular shape, and the amount of concrete required in the concrete placing work formed on the outer periphery of the excavation target hole 80 can be suppressed without waste. However, the cost of the concrete placing operation can be reduced.

When it is desired to selectively set the diameter of the unit excavation hole 86 large or small within a range not exceeding 4 m in diameter, the main body of the second excavator 9 excluding the excavation tool is provided in a small size in advance. In addition, it is sufficient to select only the drilling tool having a size corresponding to the diameter of the desired unit drilling hole 86. In such a case, the size of the main body of the second excavator 9 can be changed or the guide rod can be changed. It is not always necessary to change the diameter dimension of 7, so that it is versatile and the hole drilling cost can be minimized.

When the diameter of the target excavation hole 80 is changed, the arrangement and the number of the unit excavation holes 86 can be taken into consideration, and the size of the second excavator 9 and the guide rod 7 can be changed. In this respect, the cost of excavating a hole can be reduced.

Further, since the advanced hole 6 having a high verticality can be formed by the down-the-hole drill 85, the verticality of the guide rod 7 inserted into the advanced hole 6 can be maintained with high accuracy. Further, the reaction force at the time of excavation by the second excavator 9 can be taken by the guide rod 7, and the swing of the second excavator 9 at the time of excavation can be restricted so as to be reduced. 7 can be excavated along the extension direction of the excavator 7, and the occurrence of misalignment of the center of the second excavator 9 with respect to the center of the unit excavation hole 86 and inclination of the excavator can be suppressed. Thus, the formation of the unit drilling hole 86 having a high verticality, that is, the formation of the target drilling hole 80 having a high verticality can be realized.

During the operation of forming the advanced hole 6 by the first excavator and the operation of forming the plurality of unit excavation holes 86 by the second excavator 9, that is, the operation of forming the target excavation hole 80, Does not require the input of workers into the borehole,
Work safety can be ensured.

When the soft rock layer 1a is excavated, the earth drill bucket 10 for excavating the earth and sand can be used for discharging the excavated earth and sand. Since no special earth discharging means is required, the cost can be reduced and the guide can be reduced. The second drilling machine 9, that is, the earth drill bucket 10 is guided by the rod 7 as a guide.
Is suspended, the lifting speed of the earth drill bucket 10 can be made relatively high,
It is possible to realize high-speed excavation and unloading operations, and to improve the efficiency of the excavation target hole 80 forming operation.

In the case where the earth and sand excavated from the soft rock layer 1a is ejected by the earth drill bucket 10 and the earth and sand excavated from the hard rock layer 1b is ejected using the hammer grab 90, it is difficult to obtain water. It is easy to form the excavation target hole 80 in the above. In addition, there is no cost associated with water treatment, and in this regard, the cost of drilling holes can be reduced. Furthermore, since water is not used, it contributes to environmental protection at the work site.

Further, since the gondola 8 into which the equipment and the worker can enter can be suspended in the unit excavation hole 86, when a boulder 91 is generated in the unit excavation hole 86,
The gondola 8 can be used to cope with the processing of the boulders 91, and since the gondola 8 is lifted and lowered with the guide rod 7 as a guide, the lifting and lowering speed can be made relatively high. Work efficiency can be improved.

Next, an embodiment of the hole excavator of the present invention will be described.

FIG. 8 is a plan view showing a second excavator constituting one embodiment of the hole excavating apparatus of the present invention, FIG. 9 is a front view of the second excavator shown in FIG. 8, and FIG. 9 is a side view showing a state where another excavating tool is attached to the second excavator, FIG. 11 is a plan view showing a tower apparatus constituting one embodiment of the present invention, and FIG. 12 is an embodiment of the present invention. FIG. 13 is a diagram showing a state at the time of excavation of a soft rock layer performed according to a form, FIG. 13 is a diagram showing a state at the time of excavation of a hard rock layer performed according to an embodiment of the present invention, and FIG. 14 is a front view of the tower apparatus shown in FIG. , FIG.
FIG. 2 is a front view of the tower device showing a state in which a gondola is mounted on a guide rod.

The hole drilling apparatus according to the present embodiment is used for forming a large-diameter drilling target hole 80 formed by connecting a plurality of unit drilling holes 86 to the ground 1 described above. A first excavator that forms an advanced hole 6 located at the center of each unit drilling hole 86 formation planned area;
A guide rod 7 inserted into the advanced hole 6, and a unit excavation hole 8 guided by the guide rod 7 and larger than the advanced hole 6.
And a second excavator 9 forming the same.

Among these configurations, the first excavator for excavating the advanced hole 6 is, for example, the down-the-hole drill 85, the boring machine 3, and the down-the-hole drill 85 for forming the advanced hole 6 shown in FIGS. It is configured to include a compressor and the like for driving the motor. A first excavator having such a down-the-hole drill 85 is known from the above-mentioned Japanese Patent Application Laid-Open No. 3-119284.

Regarding the remaining structure, in particular, FIGS.
This will be described below with reference to FIG. As shown in FIG. 9, the second excavator 9 includes a stationary portion 14 that can be fixed to the guide rod 7,
A moving portion 15 connected to the stationary portion 14 and movable along the longitudinal direction of the guide rod 7; and the stationary portion 14 includes fixing means 11 for fixing the stationary portion 14 to the guide rod 7. The moving unit 15 includes a drilling tool for drilling the ground 1, for example, an earth drill bucket 10 and a diameter expanding cutter 10a that can be expanded in a horizontal direction by a hydraulic cylinder 10A.
And a rotating means for rotating the earth drill bucket 10 and the diameter increasing cutter 10 a, for example, a hydraulic motor 12, and between the stationary part 14 and the moving part 15.
A propulsion unit for propelling the earth drill bucket 10, for example, a hydraulic cylinder 13 is provided.

The moving part 15 described above is provided with a non-rotating part 15a which is restricted from rotating around the guide rod 7 and a lower part of the non-rotating part 15a.
Rotating section 15 that can rotate around guide rod 7 through
b, the hydraulic motor 12 is provided on the non-rotating portion 15a,
An earth drill bucket 10 as a drilling tool and a diameter increasing cutter 10a are provided on a rotating part 15b.

As shown in FIG. 8, the above-mentioned fixing means 11 is a hydraulic cylinder 11 fixed to the stationary portion 14.
a and a fixed band 11b capable of tightening the guide rod 7 as the hydraulic cylinder 11a is driven.

The hydraulic cylinder 13 constituting the propulsion means has one end connected to the stationary part 14 and the other end connected to the moving part 15.

The above-mentioned excavating tool, that is, the earth drill bucket 10 and the diameter expanding cutter 10a are effective for excavating the soft rock layer 1a. For excavation of the hard rock layer 1b, instead of the earth drill bucket 10 and the diameter expanding cutter 10a, as shown in FIG. 10, a roller drill bit 10b, a movable drill bit 10c which can be expanded horizontally by a hydraulic cylinder 10C, and A fixed drilling bit 10d is provided as a drilling tool.

The earth drill bucket 10 is a well-known one, and has a storage portion in which excavated earth and sand can be accumulated. By lifting the second excavator 9, it is possible to discharge earth and sand accumulated in the storage portion of the earth drill bucket 10 to the outside of the drilling hole. That is, the earth drill bucket 10 is not only a drilling tool but also serves as a means for discharging earth and sand.

In this embodiment, as shown in FIGS. 11 to 15, a tower device 17 for holding a guide rod 7 on which a second excavator 9 is mounted is provided on the ground 1. The turret device 17 includes fixing means 17 for fixing the guide rod 7.
a, the winch 1 for lifting and lowering the second excavator 9
8 is provided. The winch 18 also serves as a removing means for removing the second excavator 9 outside the unit excavation hole 86 as described later.

The wheel 18a is located below the winch 18.
The tower device 17 includes a rail 17b with which a wheel 18a is engaged. These wheels 18a and rail 1
7b constitutes means for allowing the winch 18 to move in the horizontal direction with respect to the tower device 17.

The turret device 17 is provided with a boulder 9 in a drill hole.
Gondola 8 that can store workers and equipment to remove 1
The gondola lifting device 1 can be lifted and lowered, and can be moved in the horizontal direction.
7d, a weight 17e for balancing the weight of the second excavator 9, and a hydraulic power unit 17f as a hydraulic source for driving the second excavator 9, as shown in FIG.

Hereinafter, the excavation operation performed by the hole excavator according to the embodiment of the present invention will be described.
1 to 5 described above will be described again.

The first excavator including the down-the-hole drill 85, the boring machine 3, the guide rod 7, and the second
Excavator 9 is transported to the excavation site. At the time of excavation work, as shown in FIG. 1D, a boring machine 3 constituting a first excavator is arranged on the ground 1, air is supplied to a down-the-hole drill 85 by a compressor, and FIG. As shown in FIG. 7, drilling of the advanced hole 6 by the down-the-hole drill 85 is performed. The earth and sand generated by the excavation is discharged to the outside of the ground 1 by blowing air generated by the compressor to the excavated portion. Simultaneously with the drilling of this down the hole drill 85,
Alternatively, the guide rod 7 is inserted into the advanced hole 6 after the down the hole drill 85 is pulled out from the ground 1.

For example, in the state where the guide rod 7 is inserted into the advanced hole 6 as described above, a tower device 17 is constructed as shown in FIG. The guide rod 7 inserted in the advanced hole 6 related to the unit excavation hole 86 to be formed.
And the other guide rods 7 are also fixed to the tower device 17 as illustrated in FIGS.

In this state, for example, as shown in FIG. 9, a drilling tool suitable for excavating the soft rock layer 1a, that is, as shown in FIG.
The second excavator 9 provided with a is mounted as shown in FIG. That is, the second excavator 9 is suspended by the winch 18 provided in the tower device 17. Here, the hydraulic power unit 17f is operated, and the fixing means 11 of the second excavator 9 is operated.
When the hydraulic cylinder 11a is extended, the guide rod 7 is clamped by the fixing band 11b, and the stationary portion 14 of the second excavator 9 is fixed to the guide rod 7. In this state, when the hydraulic power unit 17f is operated to extend the hydraulic cylinder 10A to expand the diameter-enlarging cutter 10a, and to drive the hydraulic motor 12 as the rotating means and the hydraulic cylinder 13 as the propulsion means, FIG.
The moving unit 15 is guided by the guide rod 7 while rotating downward, and is propelled through the swing bearing 15c shown in FIG.
The earth drill bucket 10 and the diameter expanding cutter 10 a perform drilling of a predetermined distance corresponding to the stroke of the hydraulic cylinder 13.

When the hydraulic cylinder 11a of the fixing means 11 is contracted by operating the hydraulic power unit 17f from this state, the holding of the guide rod 7 by the fixing band 11b is released, and the hydraulic cylinder of the propulsion means is released by the weight of the stationary portion 14 or the like. 13 contracts, and the stationary part 14 descends so as to approach the moving part 15.

When such excavation operation is repeated several times, the state shown in FIG. 12 is obtained, and a unit excavation hole 86 is excavated in the ground 1 composed of, for example, the soft rock layer 1a. The earth and sand accumulated in the storage portion of the earth drill bucket 10 by the excavation can be discharged to the outside of the unit excavation hole 86 by lifting the second excavator 9 with the winch 18.

During such excavation operation, the aforementioned FIG.
As shown in FIG. 15H, when a boulder 91 is formed in the unit excavation hole 86, the second excavator 9 is once lifted by the winch 18 and further
8 is moved in the horizontal direction, the second excavator 9 is removed from immediately above the unit excavation hole 86, and then the gondola suspension device 17d is moved to just above the unit excavation hole 86, and as shown in FIG. As shown, a gondola 8 containing workers and necessary equipment is suspended in a unit drilling hole 86, and
1 is removed. After processing, the gondola 8
12 is lifted by the gondola lifting device 17d.
The second excavator 9 is suspended in the unit excavation hole 86 by the winch 18 as shown in the figure, and the same operation as the excavation operation described above is continued. It is done.

When the excavated ground 1 becomes the hard rock layer 1b during the excavation operation, as shown in FIG. 10, a roller bit 10b and a movable excavation bit 10c are used instead of the earth drill bucket 10 or the like as a drilling tool. , And a fixed excavation bit 10d are attached to perform excavation. FIG. 13 shows excavation of the ground 1 composed of the hard rock layer 1b.

When a plurality of unit excavation holes 86 are formed in the ground 1 so as to communicate with each other in this manner, the above-described FIG.
As shown in FIG. 7, a large-diameter excavation target hole 80 having a diameter exceeding 4 m can be formed.

After the formation of the excavation target holes 80, the second excavator 9 is removed from the excavation target holes 80 by the winch 18, for example, and the respective guide rods 7 are also removed. In this case, the guide rod 7 is set in advance in a dividable structure, and after excavation is completed, the guide rod 7 is divided in the excavation target hole 80, and the excavation target hole 80
You may make it remove outside.

In the above description, the hydraulic motor 12 is provided as a rotating means for rotating the drilling tool.
An electric motor may be provided instead of 2 and the excavator may be rotated by the electric motor.

In the above description, the earth drill bucket 10
Although the means for discharging the excavated earth and sand is also used, at least one of a means for discharging the soil using air pressure and a means for discharging the soil using water pressure is separately provided as the discharging means. Good.

Further, in the above description, the expanding cutter 1 which is a drilling tool is used.
0a is driven by a hydraulic cylinder 10A, and the moving excavation bit 10c is driven by a hydraulic cylinder 10C.
Instead of A and 10C, electric motors may be provided, and the enlarged diameter cutter 10a and the movable excavation bit 10c may be operated by using the rotational force of these electric motors.

Even in the embodiment of the drilling apparatus having the above-described structure, the second drilling machine 9 which can be configured to be relatively small and light, similarly to the large-diameter drilling method described above. A plurality of unit excavation holes 86 having a diameter smaller than 4 m can be formed in the ground 1, and by providing these unit excavation holes 86 in a continuous manner, the unit excavation holes 86 are formed by communication of these unit excavation holes 86. A circular hole, that is, a large-diameter excavation target hole 80 having a diameter of more than 4 m can be formed in the space. Therefore, the formation of the excavation target hole 80 for the transmission tower foundation work in the mountainous area,
It is suitable for forming the excavation target hole 80 for the bridge foundation work, forming the excavation target hole 80 for the landslide prevention pile construction, forming the excavation target hole 80 at the site where it is difficult to carry in the heavy equipment, etc., and is rich in practicality.

The guide rod 7 is connected to the unit drill hole 86.
Since it is sufficient to use a small diameter that can be inserted into the advanced hole 6 smaller than the diameter of the present embodiment, this also contributes to the reduction in size and weight of the overall shape of the present embodiment.

When it is desired to selectively set the diameter of the unit excavation hole 86 large or small within a range not exceeding 4 m in diameter, the body of the second excavator 9 excluding the excavation tool is provided in advance in a small size. In addition, it is sufficient to select only the drilling tool having a size corresponding to the diameter of the desired unit drilling hole 86. In such a case, the size of the main body of the second excavator 9 can be changed or the guide rod can be changed. It is not always necessary to change the diameter dimension of 7, so that it is versatile and the hole drilling cost can be minimized.

When the diameter of the target excavation hole 80 is changed, it can be dealt with by considering the arrangement and number of the unit excavation holes 86, and the size of the second excavator 9 and the guide rod 7 can be changed. In this respect, the cost of excavating a hole can be reduced.

Since the advanced hole 6 having a high verticality can be formed by the down-the-hole drill 85, the verticality of the guide rod 7 inserted into the advanced hole 6 can be maintained with high accuracy. In addition, the reaction force at the time of excavation by the second excavator 9 can be taken by the guide rod 7 to which the second excavator 9 is attached, so that the swing of the second excavator 9 at the time of excavation is reduced. Can be excavated along the direction in which the guide rod 7 extends, and the center of the second excavator 9 is misaligned with respect to the center of the unit excavation hole 86, and the second excavator 9 The generation of the inclination can be suppressed. Thus, the formation of the unit drilling holes 86 having a high verticality, that is, the formation of the target drilling holes 80 having a high verticality can be realized.

Further, by providing the tower device 17 for holding the guide rod 7 on which the second excavator 9 is mounted on the ground 1, the reaction force at the time of excavation can be taken by the tower device 17. The swing of the guide rod 7 is small, so that the stable unit drilling hole 86 can be formed, and the formation of the unit drilling hole 86 with high verticality, that is, the formation of the drilling target hole 80 with high verticality can be realized. . Further, by fixing other guide rods 7 inserted into the advanced holes 6 other than the guide rods 7 on which the second excavator 9 is mounted to the tower device 17, the reaction force during excavation is reduced. Can also be used to form a stable unit drilling hole 86, thereby forming a more vertical unitary drilling hole 86, that is, forming a higher verticality drilling target hole 80. Can be realized.

During the operation of forming the advanced hole 6 by the first excavator and the operation of forming the plurality of unit excavation holes 86 by the second excavator, that is, the operation of forming the target excavation hole 80,
Basically, there is no need to insert workers into the excavation hole, and the work safety can be ensured.

When the soft rock layer 1a is excavated, the earth drill bucket 87 for excavating the earth and sand can be used for discharging the excavated earth and sand. Since no special earth discharging means is required, the cost can be reduced and the guide can be reduced. The second drilling machine 9, that is, the earth drill bucket 87 is guided by the rod 7 as a guide.
Is suspended, the lifting speed of the earth drill bucket 87 can be relatively high,
It is possible to realize high-speed excavation and unloading operations, and to improve the efficiency of the excavation target hole 80 forming operation.

Further, since the gondola 8 into which the equipment and the worker can enter can be suspended in the unit excavation hole 86, when the boulder 91 is generated in the unit excavation hole 86, the gondola 8 is used. And the gondola 8 is lifted and lowered by using the guide rod 7 as a guide, so that the lifting and lowering speed can be made relatively high, and the efficiency of the rolling stone processing operation is improved. be able to.

[0090]

According to the large-diameter hole drilling method according to claim 1 of the present invention and the hole drilling apparatus according to claim 12, a plurality of unit drill holes each having a diameter smaller than 4 m are formed so as to communicate with each other. By doing so, a large-diameter excavation target hole having a diameter exceeding 4 m can be easily obtained. In consideration of the shape, weight, etc., a relatively small and light-weight second excavator having a diameter of 4 m or less, which can be transported by ordinary transport means, is used to form the unit drilling hole described above. Large drilling target holes for power transmission tower foundation construction in mountainous areas, large diameter drilling target holes for bridge foundation construction, large diameter drilling target holes for landslide prevention pile construction, and heavy equipment loading. It is suitable for forming a large-diameter excavation target hole or the like in a difficult site, and is highly practical.

Further, since the guide rod need only have a diameter small enough to be inserted into an advanced hole smaller than the diameter of a unit drill hole, the overall shape of the hole drilling device used in this respect can also be reduced in size and weight. Can be practical.

Further, when the diameter of the target drilling hole is changed, it can be dealt with by considering the arrangement and number of unit drilling holes, and it is not necessary to change the size of the drilling equipment to be used. In this way, the cost of excavating holes can be reduced.

According to the large-diameter hole excavation method according to the second aspect of the present invention, in particular, since a molding hole is formed in the ground between adjacent unit excavation holes, the excavation target hole can be precisely formed. A circular hole, that is, a hole that is closer to a circular shape, can be used in concrete placing work formed on the outer periphery of the excavation target hole, and the required amount of concrete can be suppressed without waste. The cost for work can be kept low.

Further, according to the large-diameter hole drilling method according to the third aspect of the present invention and the hole drilling apparatus according to the twelfth, thirteenth and fourteenth aspects, it is possible to form the small-diameter advanced hole with a high verticality. Because it is easy, the verticality of the guide rod inserted into this advanced hole can be maintained with high accuracy, and the reaction force at the time of excavation of the excavator forming the unit drill hole can be taken by the guide rod. , The excavator can be regulated so as to reduce the swing thereof, can be excavated along the extension direction of the guide rod, the center of the excavator with respect to the center of the unit excavation hole, and the excavator The generation of the inclination can be suppressed. Thus, formation of a unit drilling hole having a high verticality, that is, formation of a target drilling hole having a high verticality can be realized.

When it is desired to selectively set the diameter of the unit excavation hole whose diameter does not exceed 4 m to be large or small, the body of the excavator excluding the excavation tool is provided in advance in a small size, and only the excavation tool is desired. In this case, it is not necessary to change the size of the body of the excavator or the diameter of the guide rod. And drilling costs can be kept to a minimum.

In addition, during the operation of forming an advanced hole and the operation of forming a plurality of unit excavation holes, that is, during the operation of forming a target excavation hole, basically, it is not necessary to insert a worker into the excavation hole,
Work safety can be ensured.

Further, according to the hole drilling apparatus of the present invention, an earth drill bucket for digging the earth can be used for discharging the digged earth and sand, and no special earth discharging means is required, so that the cost can be reduced. In addition, since the second drilling machine, that is, the earth drill bucket is lifted and lowered by using the guide rod as a guide, the lifting speed of the earth drill bucket can be made relatively high, and the drilling and earth discharging work can be performed. Higher speed can be realized, and the efficiency of the work of forming the target drilling hole can be improved.

Further, since the earth removal operation can be performed without requiring water, it is easy to form a target excavation hole in a mountain area where water is difficult to obtain. In addition, there is no cost associated with water treatment, and in this regard, the cost of drilling holes can be reduced.
Furthermore, since water is not used, it contributes to environmental protection at the work site.

Further, according to the hole excavator according to claim 28 of the present invention, since the guide rod on which the second excavator is mounted is held by the turret apparatus, the unit excavation of the unit excavation hole by the second excavator is performed. At the time of excavation, the reaction force at the time of excavation can be taken by the turret device, the swing of the guide rod is small, a stable unit excavation hole can be formed, and the unit excavation hole with high verticality, that is, the verticality Contributes to the realization of high drilling target holes.

Further, according to the hole drilling apparatus of the thirty-first aspect of the present invention, the reaction force at the time of digging can be taken by the guide rod without the second excavator, so that the unit drilling hole is more stable. Can be formed, which contributes to the formation of a unit drilling hole with higher verticality, that is, the formation of a drilling target hole with higher verticality.

According to the drilling apparatus of claim 32 of the present invention, when a boulder occurs in the unit drilling hole, equipment and a worker get into the gondola and suspend the gondola in the unit drilling hole. This makes it possible to deal with the processing of boulders, and because the gondola is lifted and lowered as a guide rod guide, the lifting speed can be made relatively high, and the efficiency of this boulder processing work can be improved. it can.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of a large-diameter hole drilling method according to the present invention.

FIG. 2 is a diagram illustrating an embodiment of a large-diameter hole excavation method according to the present invention.

FIG. 3 is a diagram illustrating an embodiment of a large-diameter hole excavation method according to the present invention.

FIG. 4 is a diagram illustrating an embodiment of a large-diameter hole excavation method according to the present invention.

FIG. 5 is a plan view showing a first example of a target excavation hole obtained by the embodiment shown in FIGS.

FIG. 6 shows a second example of the excavation target hole obtained by the present embodiment.
It is a top view which shows the example of.

FIG. 7 shows a third example of the excavation target hole obtained by the present embodiment.
It is a top view which shows the example of.

FIG. 8 is a plan view showing a second excavator constituting one embodiment of the hole excavating apparatus of the present invention.

9 is a front view of the second excavator shown in FIG.

FIG. 10 is a side view showing a state where another excavator is attached to the second excavator shown in FIG. 9;

FIG. 11 is a plan view showing a tower device constituting one embodiment of the present invention.

FIG. 12 is a diagram showing a state during excavation of a soft rock layer performed according to an embodiment of the present invention.

FIG. 13 is a diagram showing a state at the time of excavation of a hard rock layer performed according to an embodiment of the present invention.

FIG. 14 is a front view of the tower apparatus shown in FIG. 11;

FIG. 15 is a front view of the tower apparatus showing a state in which a gondola is mounted on a guide rod.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 1a Soft rock layer 1b Hard rock layer 3 Boring machine (1st excavator) 6 Advanced hole 7 Guide rod 8 Gondola 9 Second excavator 10 Earth drill bucket (Drilling tool, earth removal means) 10A Hydraulic cylinder 10a Expansion of diameter Cutter 10b Roller bit (digging tool) 10c Mobile drilling bit (digging tool) 10d Fixed drilling bit (digging tool) 11 Fixing means 11a Hydraulic cylinder (fixing means) 11b Fixed band (fixing means) 12 Hydraulic motor (rotating means) 13 Hydraulic pressure Cinder (propulsion means) 14 Stationary part (second excavator) 15 Moving part (second excavator) 15a Non-rotating part 15b Rotating part 15c Slewing bearing 17 Tower device 17a Fixing means 17b Rail 17d Gondola suspension device 17f Hydraulic power unit 18 Winch 18a Wheel 80 Excavation target hole 81 Forming hole 8 Dotomesaku 83 expected excavation area 84 jib crane 85 down-the-hole drill (first excavator) 86 units borehole 88 Haidoana 90 hammer grab 91 boulders

Claims (32)

[Claims] 1. A plurality of advanced holes are excavated in the ground, guide rods are inserted into each of the advanced holes, and unit excavations larger than the advanced holes are formed in the ground using the guide rods as guides. A large-diameter hole excavation method, wherein the unit excavation holes are communicated with each other to form one large-diameter excavation target hole. 2. The large-diameter hole excavation method according to claim 1, wherein a molding hole for communicating the corresponding unit excavation holes is formed in the ground located between the adjacent unit excavation holes. 3. An excavator for forming the unit excavation hole is fixed to the excavator for excavating the ground, a rotating unit for rotating the excavator, a propulsion unit for propelling the excavator, and the guide rod. A fixing means, wherein the excavating tool is propelled along the guide rod by the propelling means while the excavating tool is rotated by the rotating means in a state where the excavating tool is fixed to the guide rod by the fixing means. 3. The method for excavating a large-diameter hole according to claim 1, wherein the excavation hole is formed. 4. The excavator is excavated for a predetermined distance by the excavating tool while being fixed to the guide rod by the fixing means. Here, the excavator is temporarily stopped, and the fixing by the fixing means is released. The excavator is disengaged from the guide rod, the excavator is moved by a distance corresponding to the predetermined distance, and the excavator is fixed to the guide rod again by the fixing means at the moved position, and is again fixed by the excavator at a predetermined distance. 4. The method for excavating a large-diameter hole according to claim 3, wherein the excavation is performed, and the same operation is repeated until the entire length of the corresponding unit excavation hole is formed. 5. A process for removing a boulder by hanging down a gondola carrying an operator and equipment inside the unit drilling hole when a rock is formed inside the unit drilling hole when forming the unit drilling hole. The method for drilling a large-diameter hole according to claim 1, wherein the drilling is performed. 6. The method for excavating a large-diameter hole according to claim 1, wherein the earth and sand generated by the excavation is discharged to the outside of the ground. 7. The method for excavating a large-diameter hole according to claim 1, wherein the excavation target hole is a vertical hole extending in a vertical direction. 8. The method of claim 1, wherein the target hole is a horizontal hole extending in a horizontal direction. 9. The excavator is detached from the guide rod after the formation of one unit excavation hole, and the excavator is removed to the outside of the unit excavation hole. Large diameter hole drilling method. 10. The method for excavating a large-diameter hole according to claim 1, wherein, after the formation of the target hole, the guide rod is removed to the outside of the target hole. 11. The method for excavating a large-diameter hole according to claim 10, wherein the guide rod is divided inside the excavation target hole, and then removed outside the excavation target hole. 12. A first hole which is used for forming a large-diameter excavation target hole formed by connecting a plurality of unit excavation holes to the ground and forms an advanced hole located at the center of the unit excavation hole formation planned area. Excavator, a guide rod inserted into the advanced hole, and a second excavator guided by the guide rod to form the unit excavation hole larger than the advanced hole. Hole drilling rig. 13. The second excavator has a stationary part that can be fixed to the guide rod, and a moving part that is connected to the stationary part and that can move in the longitudinal direction of the guide rod. The stationary part includes fixing means for fixing the stationary part to the guide rod. 13. The hole drilling apparatus according to claim 12, further comprising a propulsion unit for propelling the drilling tool between the moving unit and the moving unit. 14. The non-rotating part, wherein the moving part is restricted from rotating around the guide rod, and a rotating part provided below the non-rotating part and rotatable around the guide rod. 14. The apparatus according to claim 13, wherein the rotating means is provided on the non-rotating portion, and the excavating tool is provided on the rotating portion.
A hole drilling device as described. 15. The fixing means according to claim 13, wherein said fixing means comprises a hydraulic cylinder fixed to said stationary portion, and a fixing band capable of tightening said guide rod with driving of said hydraulic cylinder. 15. The hole drilling apparatus according to claim 14. 16. The apparatus according to claim 13, wherein said rotating means is one of a hydraulic motor and an electric motor.
Or the hole drilling apparatus according to 14. 17. The hole drilling apparatus according to claim 13, wherein the propulsion means is a hydraulic cylinder having one end connected to the stationary part and the other end connected to the moving part. 18. The drilling apparatus according to claim 13, wherein the drilling tool is an earth drill bucket. 19. The drilling apparatus according to claim 13, wherein the drilling tool is a roller bit. 20. The drilling apparatus according to claim 12, wherein the first drilling machine has a down-the-hole drill for drilling the advanced hole. 21. The hole drilling apparatus according to claim 13, further comprising an earth discharging means for discharging earth and sand generated by excavating the ground with the drilling tool to the outside of the ground. 22. An earth drill bucket as said drilling tool, said earth discharging means also serving as said earth discharging means.
The drilling apparatus according to claim 1. 23. The drilling apparatus according to claim 21, wherein the discharging means is at least one of a discharging means utilizing pneumatic pressure and a discharging means utilizing water pressure. . 24. The drilling apparatus according to claim 12, wherein the guide rod is formed so as to be dividable. 25. The drilling apparatus according to claim 12, further comprising removing means for removing the second drilling machine outside the unit drilling hole. 26. The drilling apparatus according to claim 13, wherein the drilling tools are a roller bit, a fixed drill bit, and a mobile drill bit. 27. The drilling apparatus according to claim 26, wherein the movable drilling bit is a drilling bit that can be expanded and contracted in a radial direction of the unit drilling hole by one of a hydraulic cylinder and an electric motor. 28. The hole drilling apparatus according to claim 12, wherein a tower apparatus for holding a guide rod on which the second excavator is mounted is provided on the ground. 29. The turret device according to claim 28, further comprising a winch for lifting the second excavator.
A hole drilling device as described. 30. A wheel is provided at a lower portion of the winch, a rail on which the wheel is engaged is provided on the turret device, and the winch is disposed so as to be movable in a horizontal direction with respect to the turret device. 30. The drilling apparatus of claim 29, wherein 31. The guide device according to claim 28, wherein another guide rod inserted into the advanced hole other than the guide rod on which the second excavator is mounted is fixed to the tower device.
A hole drilling device as described. 32. The hole excavation according to claim 28, wherein a gondola is arranged on the tower device, and the gondola is provided so as to be able to be lifted and lowered and to be movable in the horizontal direction with respect to the tower device. apparatus.