JP3205869B2 - Drilling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device used for drilling a ground pile prior to a pile driving operation in an embedded pile method.

[0002]

2. Description of the Related Art As a conventional drilling device of this kind, there are a rotating force applying means suspended by a crane, a casing provided integrally with the rotating force applying means, and a drilling means provided by the rotating force applying means. The drilling tool is provided with a rotary drilling tool that is inserted into the casing with a drilling tool that provides a necessary rotational force, and a rotational reaction force receiving means that receives a rotational reaction force generated in the casing by drilling. There is something.

[0003] Here, the rotary reaction force receiving means is formed on a horizontal reaction member receiving base formed by laying horizontal members in a cross-girder shape on several piles driven around the drilling point, and formed on the horizontal member. And a guide member provided vertically on the outer periphery of the casing.

According to this type of drilling device, the rotation of the casing is restrained by engaging the guide member provided on the outer periphery of the casing with the guide groove formed in the horizontal member. That is, since a rotary reaction force generated in the casing during drilling can be received, the ground can be drilled by the rotary drilling means suspended by a crane.

[0005]

However, in this type of drilling machine, a rotary reaction force receiving base is installed at each drilling location prior to the drilling operation, and the drilling and removing work is carried out after drilling. Since it requires other temporary work (hereinafter referred to as "temporary work"), it has the following inconveniences.

In other words, the work of setting and removing the rotary reaction force receiving stand requires a separate pile driving work in temporary construction in addition to a pile driving work originally required in main construction. In addition, it is extremely complicated and time-consuming in view of the necessity of joining the members, and the construction period is prolonged. In this case, if a separate working unit is introduced to shorten the construction period, the cost is increased.

[0007] In addition, installation and removal of the rotary reaction force receiving stand in a mountainous area with steep terrain involves a considerable danger to the worker, and it is necessary to avoid this danger. Then, separate work such as construction of a safe work scaffold is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drilling device which does not require a temporary work such as a work for installing and removing a rotary reaction force receiving base.

[0009]

In order to achieve the above object, a drilling device according to the present invention is suspended directly or indirectly by a crane, and is provided with a portion for applying a rotational force and a rotational force. Insertion means into the casing by means of a rotating force applying means consisting of a portion to be provided, a casing provided integrally with the part applying the rotating force, and a drilling tool for applying the necessary rotating force to the drilling by the rotating force applying means And a rotary reaction force receiving means for receiving a rotational reaction force generated in the casing by drilling, wherein the rotation reaction force receiving means is provided to a crane. Hanging directly or indirectly, restraining the rotation of the casing, and a rotation constraint table that is freely movable along the casing, and is provided integrally with the rotation constraint table,
It is characterized in that it includes a support leg which is supported by being driven into the ground to support the rotary restraint table, and which can be remotely operated for driving and pulling out.

That is, the present invention provides a rotary drilling table including a rotary restraint table for restraining the rotation of a casing and a support leg capable of being remotely driven into the ground, in addition to the components provided in the conventional drilling device. By realizing the technical means including the reaction force receiving means, it is possible to provide a drilling device that does not require a temporary work such as an installation work and a removal work of the rotary reaction force receiving base.

In such technical means, the drilling tool may be any tool that can be used by being provided with a rotating force required for drilling by the rotating force applying means and inserted into the casing. If the ground is soft, a screw rod and a cutting bit can be used.If the ground is hard, a drill rod, down-the-hole drill, and a hammer bit, which will be described later, can be appropriately selected. can do.

[0012] Further, as the rotating force applying means, in a state in which the portion for applying the rotating force is suspended by a crane and provided integrally with the casing, the rotating force is applied to the drilling tool in the casing. If it is possible to apply the torque, the type of torque application, output, etc. may be appropriately selected according to the ground to be drilled, the surrounding environment, etc.For example, in addition to the air motor, electric motor, hydraulic motor, engine Formulas and the like can be used.

Here, "indirectly suspended" means that the rotating force applying means is not suspended directly but suspended via a casing, a drilling tool or the like.

However, in order to obtain a stable operability by shortening the length from the position where the rotational force is applied to the tip position receiving a load from the ground during drilling to reduce the center of gravity. In view of the above, it is preferable that in the rotational force applying means, a portion for applying the rotational force is provided integrally with the rotation restriction table. In addition to the stable operability, from the viewpoint of reducing the weight by eliminating the rod portion of the drilling tool portion, it is preferable that the rotational force applying means is provided inside the casing. .

In this case, if the rotation restraining table is directly or indirectly suspended by a crane, restrains the rotation of the casing, and can move freely along the casing, a supporting leg may be used. As long as the configuration corresponds to the number and arrangement of the cranes (including a crane that is separate from the crane that suspends the rotational force applying means), it can be suspended directly or indirectly (for example, the casing In this case, the type and structure of the casing can be appropriately selected.

However, from the viewpoint of improving the workability in the case where the supporting legs are driven into the ground by remote control, the rotation restraining table is provided in the case where the position of the casing is fixed. It is preferable to have a support leg position moving means for moving the position of the support leg.
As the support leg position moving means, a means for moving the position of the support leg when the position of the casing is fixed by, for example, expansion and contraction, rotation, or the like can be considered.

Here, "indirectly suspended" means that the rotation constraint table is not suspended directly but suspended via a casing, a drilling tool or the like. However, in this case, the rotation restriction table needs to have another self-elevating means and the like, so that the rotation restriction table can move freely along the casing.

Further, if the support leg is provided integrally with the rotation restraining table and is supported by being driven into the ground, and the remote control of the driving and pulling out is possible. For example, in addition to the dynamic type using impact force and vibration force, the static type using press-fitting and drilling, the type of ground, the strength and the magnitude of the rotational reaction It may be appropriately selected depending on the situation.

However, by using a driving means having the same configuration and function as the rotary drilling means, it is possible to secure compatibility with the ground, reduce costs by sharing mechanical equipment, and facilitate maintenance. From the viewpoint of realizing, the support leg is provided with a rotation force application unit for the support leg provided integrally with the rotation restriction table, and at least one of the rotation force application unit for the support leg and the rotation restriction table. A supporting leg casing integrally provided with the supporting leg casing, and a supporting leg drilling tool to which a rotating force required for drilling is applied by the supporting leg rotating force applying means, which is inserted into the supporting leg casing. It preferably comprises

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. First Embodiment FIG. 1 is a side view showing an entire configuration of a drilling device according to a first embodiment of the present invention, and FIG. 2 is a diagram showing a partial configuration of the drilling device (FIG. 2A). 2 is a side view, FIG. 2B is a front view, FIG.
FIG. 3 (c) is a plan view), FIG. 3 is a view showing a configuration of a portion of the drilling device that restricts rotation of the casing (FIG. 3 (a) is a transverse sectional view, and FIG. 3 (b) is a longitudinal sectional view). is there.

In the first embodiment, the drilling device includes:
It is used for driving a steel pile constituting a part of a pier serving as a temporary road to a pit yard of the mountain tunnel and a temporary road to the pit yard, and is configured as follows.

That is, as shown in FIGS. 1 and 2, the drilling device is a rotary machine directly suspended by the main hook 3a of the crawler crane 3 mounted on the pier S already assembled. Rotation drive device 11 serving as force applying means, casing 1
2, a rotary drilling means 1 comprising a drilling tool 13 which can be remotely operated, and an auxiliary hook 3 of a crawler crane 3
b and the rotary reaction force receiving means 2 directly suspended at b.

As shown in FIGS. 2 (a) and 2 (b), the rotary driving device 11, which is a component of the rotary drilling means 1, has a portion 11a for applying a rotational force and a portion 11a for applying a rotational force. 11 to which rotational force is applied.
It plays a role of applying a rotational force (at the top of the drilling tool 13) to the drilling tool 13 integrally connected to b.

In the first embodiment, a hydraulic motor (not shown) is provided in the portion 11a for applying the rotational force, and the hydraulic power unit 4 and the hydraulic power unit 4 mounted on the pier S are provided. The hydraulic pressure is secured by the hydraulic hose 4a connecting the hydraulic motor and the hydraulic motor (see FIG. 1).

As shown in FIGS. 2 (a) and 2 (b), the casing 12, which is a component of the rotary drilling means 1,
It is provided integrally with a portion 11a of the rotary drive device 11 that applies a rotational force, and is used when drilling a ground (hole wall).
Plays a role in preventing collapse.

Further, a drilling tool 13 which is a component of the rotary drilling means 1 is, as shown in FIGS. 2 (a) and 2 (b),
The rotary drive device 11 applies a necessary rotational force to the drilling and is inserted into the casing 12, and drills using compressed air.

Specifically, the drilling tool 13 includes a drill rod 13a integrally connected to a portion 11b of the rotary drive device 11 to which the rotational force is applied, and a drill rod 13a to a lower end of the drill rod 13a. Down-the-hole drill 13b and down-the-hole drill 13b integrally connected thereto
Hammer bit 13c hitting the ground at the lower end
Consists of A pipe (not shown) for compressed air is provided inside the drill rod 13a, and the down-the-hole drill 1 is provided.
Secure the supply of compressed air to 3b.

In the first embodiment, the compressed air is supplied to the down-the-hole drill 13b by the compressor 5 mounted on the pier S and its auxiliary equipment (the receiver tank 5a, as shown in FIG. 1). It is secured by the line oiler 5b, the injection pump 5c, and the air hose 5d).

On the other hand, as shown in FIGS. 2A and 2B, the rotation reaction force receiving means 2 receives the rotation reaction force generated in the casing 12 by drilling. The support leg 22 and a set of rotation constraint mechanisms 23 provided on the rotation constraint table 21 and the casing 12.
It is composed of

Here, as shown in FIGS. 2A and 2B, the rotation constraint table 21 which is a component of the rotation reaction force receiving means 2 is directly hung by the crawler crane 3, and Is restricted, and can move along the casing 12.

As shown in FIGS. 2 (a) and 2 (b), the support leg 22, which is a component of the rotation reaction force receiving means 2, is provided integrally with the rotation restriction table 21 so as to strike the ground J. By being provided, the rotary restraint table 21 is supported, and remote control of driving and pulling out is possible.

More specifically, the support leg 22 is composed of a small rotary drive device 22a, which is provided integrally with the rotation restriction table 21 and is a rotation force applying means for the support leg, and a support leg casing provided integrally with the rotation restriction table 21. The small casing 22b includes a small casing 22b and a small drilling tool 22c, which is a drilling tool for a support leg, to which a rotating force required for drilling is applied by the small rotary driving device 22a, and which is inserted into the small casing 22b.

Here, the small drilling tool 22c has the same configuration and function as the drilling tool 13 and performs drilling using compressed air.
1. A small down-the-hole drill and a small hammer bit 33.

The supply of the compressed air to the small down-the-hole drill 32 is similar to the supply of the compressed air to the down-the-hole drill 13b, and the compressor 5 mounted on the pier S and its attached equipment (receiver tank 5a, line Secured by oiler 5b, injection pump 5c and air hose 5d).

FIG. 2 shows the rotation constraint table 21.
As shown in (c), an opening 34 for the main body into which the casing 12 is inserted and an opening 35 for the support leg into which the support leg 22 is inserted are provided. The rotation constraint table 21
The shape, the number of openings, and the like can be appropriately changed according to the number of support legs 22, the required magnitude of the rotational reaction force, and the like. In this case, the support leg opening 35 is
Similar to the first embodiment, stable operability is ensured by arranging them around the main body opening 34 in a well-balanced manner.

In the first embodiment, since the supporting leg 22 is a driving means having the same configuration and function as the rotary drilling means 1, the compatibility with the ground J is ensured. In addition, cost reduction and easy maintenance can be achieved by sharing mechanical equipment.

Further, as shown in FIG. 3, the rotation restraining mechanism 23, which is a component of the rotation reaction force receiving means 2, includes a cylindrical outer shell supporting member 41 provided integrally with the rotation restraining table 21.
Block 4 having a guide groove 42a having a rectangular cross section secured to the outer shell support member 41 with bolts B.
2 and a guide member 43 provided on the outer periphery of the casing 12 and having a rectangular cross section corresponding to the guide groove 42a. Due to the presence of the rotation restriction mechanism 23, the rotation restriction table 21 can freely move along the casing 12 while restricting the rotation of the casing 12.

Next, the operation of the drilling apparatus according to the first embodiment will be described with reference to FIG. 1, FIG. 4 and FIG.

First, when the rotary driving device 11 is suspended by the main hook 3a of the crawler crane 3 by remote operation of the operator, the casing 12 and the drilling tool 13 integrated with the rotary driving device 11 are also suspended at the same time. Can be lowered. At this time, the remote reaction force receiving means 2 is suspended by the auxiliary hook 3b of the crawler crane 3 on the other hand by the remote operation of the operator.

When the main hook 3a and the auxiliary hook 3b are lowered in such a state, the hammer bit 1 of the drilling tool 13 projecting from the front end opening of the casing 12 is formed.
3c abuts on the surface of ground J which is a predetermined drilling point (FIG. 4a).

Subsequently, when compressed air is supplied to the down-the-hole drill 13b of the drilling tool 13 by the compressor 5, the hammer bit 13c performs an impact operation on the ground J. By appropriately lowering the main hook 3a while performing the hitting operation with the hammer bit 13c, the ground J is drilled, and the casing 12 is inserted into the ground J following the drilling of the ground J. (Fig. 4
b). In the drilling of the ground J, since the rotation reaction force receiving means 2 is not yet fixed to the ground J, only the hitting operation by the hammer bit 13c is performed without applying a rotating force to the drilling tool 13. The slime that is the residual soil generated by the drilling is conveyed to the surface of the ground J by the action of the compressed air through the gap between the casing 12 and the ground J (this description is omitted below).

After the drilling of the ground J by the drilling tool 13 to a predetermined depth and the insertion of the casing 12 are completed, the striking operation by the hammer bit 13c is stopped, and then the fixing of the support legs 22 to the ground J is stopped. Do.

That is, on the one hand, by the compressor 5,
Small down-the-hole drill 32 for small drilling tool 22c
When compressed air is supplied to the small hammer bit 33, the small hammer bit 33 performs a striking operation on the ground J, and on the other hand, when a rotational force is applied to the small drilling tool 22c by the small rotary drive device 22a, The small hammer bit 33 rotates with respect to the ground J. By appropriately lowering the auxiliary hook 3b while performing the striking operation and the rotating operation by the small hammer bit 33 in a superimposed manner, the ground J is drilled, and the small casing 22b follows the drilled hole of the ground J.
Is inserted into the ground J. At this time, the rotation reaction force generated in the small casing 22 b by the drilling can be received by the casing 12 inserted into the ground J through the rotation restriction table 21 and the rotation restriction mechanism 23. Then, the rotation restriction table 21 is lowered along the casing 12 by the rotation restriction mechanism 23 while the rotation is restricted by the casing 12.

When the drilling of the ground J by the small drilling tool 22c to a predetermined depth and the insertion of the small casing 22b are completed, the striking operation and the rotating operation are stopped, and the support leg 22 is fixed to the ground J. (FIG. 4c).

Next, drilling of a pile hole is performed for the purpose of driving a steel pile used for construction of the pier S into the ground.

That is, on the one hand, by the compressor 5,
When the compressed air is supplied to the down-the-hole drill 13b of the drilling tool 13, the hammer bit 13c performs a striking operation on the ground J, and on the other hand, the rotational driving device 11 applies a rotational force to the drilling tool 13. When given, the hammer bit 13c rotates with respect to the ground J.
By appropriately lowering the main hook 3a while performing the striking operation and the rotating operation by the hammer bit 13c in a superimposed manner, the ground J is bored. J (FIG. 5d).

At this time, the rotation reaction force generated in the casing 12 by the drilling can be received by the rotation reaction force receiving means 2. That is, the rotational reaction force generated in the casing 12 by the drilling is transmitted to the restraining block 42 via the guide member 43 provided on the outer periphery of the casing 12, and then from the restraining block 42 via the outer shell supporting member 41. The rotation transmitted to the rotation constraint table 21 and the support legs 2
2 to the ground J (see FIG. 3).

Then, the drilling tool 13 to a predetermined depth
When the drilling of the ground J and the insertion of the casing 12 are completed, the striking operation and the rotation operation are stopped, and the drilling of the pile hole for driving the steel pile into the ground J is completed.

Then, by remote control of the operator,
First, the rotary drilling means 1 is lifted by the main hook 3a of the crawler crane 3 (FIG. 5e), and then the rotation reaction force receiving means 2 is lifted by the auxiliary hook 3b of the crawler crane 3 (FIG. 5f). Then, the drilling device retracts from the drilling point. It should be noted that there is no particular meaning as to which of the rotary drilling means 1 and the rotational reaction force receiving means 2 is first retracted from the drilling point.

Therefore, according to the drilling device according to the first embodiment, in addition to the components provided in the conventional drilling device,
Rotation restriction table 21 for restricting rotation of casing 12
In addition, since the rotary reaction force receiving means 2 including the support legs 22 capable of being driven into the ground J by remote control is provided, temporary installation work such as installation work and removal work of the rotation reaction force receiving base is required. lost.

Embodiment 2 FIG. 6 is a front view showing a part of the configuration of a drilling apparatus according to Embodiment 2 of the present invention. Note that components similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted here.

The drilling apparatus according to the second embodiment is substantially the same as that of the first embodiment, but differs from the first embodiment in that a rotary drive device 51 is used instead of the rotary drive device 11 to drill a hole. A drilling tool 53 is used instead of the tool 13.
In the rotary drive device 51, a portion 51a for applying a rotational force is provided integrally with the rotation constraint table 21. As a result, a rotation force is applied by the rotation driving device 51 at an intermediate portion of the drilling tool 53 located just at the height of the rotation constraint table 21.
In the second embodiment, the air swivel 52
Is provided so as to be exposed, but in other embodiments, an air swivel is similarly provided inside the rotary drive device or the like.

Therefore, according to the second embodiment, as compared with the first embodiment, the hammer bit which receives a load from the ground J at the time of drilling from the position where the rotational force is applied in the drilling tool 53. The length dimension up to 53c can be considerably shortened, whereby the center of gravity is lowered, and stable operability can be obtained.

Third Embodiment FIG. 7 is a front view showing a partial configuration of a drilling apparatus according to a third embodiment of the present invention. Note that components similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted here.

The drilling device according to the third embodiment is substantially the same as that of the first embodiment, but differs from the first embodiment in that a rotary driving device 61 is used instead of the rotary driving device 11 to drill a hole. A drilling tool 63 is used instead of the tool 13.
The rotary drive device 61 is provided inside the casing 12 and at the top of the down-the-hole drill 63b. As a result, the casing 1
The drill rod 13a inserted into the inside of the rotary drive 2 becomes unnecessary, and the application of the rotational force by the rotary drive 61 is
It is performed directly on the down-the-hole drill 63b. The third embodiment has the same effect as the second embodiment in that stable operability is obtained as compared with the first embodiment.

Therefore, according to the third embodiment, the same effects as those of the second embodiment can be obtained, and the weight can be reduced by eliminating the rod portion of the drilling tool portion. , The work radius is greatly increased, the crawler crane 3 is downsized, and the scale of the pier S is reduced.

Embodiment 4 FIG. 8 is a front view showing a partial configuration of a drilling apparatus according to Embodiment 2 of the present invention. Note that components similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted here.

The drilling device according to the fourth embodiment is substantially the same as that of the first embodiment, but differs from the first embodiment in that the support leg 22 when the rotation constraint table 21 fixes the position of the casing 12 is different from that of the first embodiment. Has a hydraulic cylinder 71 as a support leg position moving means for moving the position. As a result, the rotation constraint table 21 expands and contracts in the direction indicated by the arrow.

Therefore, according to the fourth embodiment, when the support leg 22 is to be driven into the ground J by remote control, the point at which the support leg 22 is to be driven may be a tree, a boulder, or the like. The position of the support leg 22 can be moved even when an obstacle is present or is too steep to make it difficult to drive the support leg 22 as it is, thereby leveling the placement point and removing the obstacle. And other work is avoided, and the workability can be dramatically improved.

[0060]

According to the present invention, with the above-described structure, it is possible to provide a drilling device which does not require a temporary work such as an installation work and a removal work of the rotary reaction force receiving base.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall configuration of a drilling apparatus according to Embodiment 1 of the present invention.

FIGS. 2A and 2B show a partial configuration of a drilling apparatus according to Embodiment 1 of the present invention (FIG. 2A is a side view, FIG. 2B is a front view, and FIG. FIG. 7 is a plan view of only the constraint table.

FIG. 3 is a diagram showing a configuration of a portion for restricting rotation of a casing of the drilling apparatus according to Embodiment 1 of the present invention (FIG. 3A).
Is a transverse sectional view, and FIG. 3B is a longitudinal sectional view.

FIG. 4 is a front view illustrating the operation of the drilling apparatus according to Embodiment 1 of the present invention.

FIG. 5 is a front view illustrating the operation of the drilling apparatus according to Embodiment 1 of the present invention.

FIG. 6 is a front view showing a configuration of a part of a drilling apparatus according to Embodiment 2 of the present invention.

FIG. 7 is a front view showing a partial configuration of a drilling apparatus according to Embodiment 3 of the present invention.

FIG. 8 is a front view showing a partial configuration of a drilling apparatus according to Embodiment 4 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotary drilling means 2 ... Rotation reaction force receiving means 3 ... Crawler crane 3a ... Main hook 3b ... Supplementary hook 4 ... Hydraulic power unit 4a ... Hydraulic hose 5 ... Compressor 5a ... Receiver tank 5b ... Line oiler 5c ... Injection pump 5d ... Air hose 11 ... Rotation driving device 11a ... Part that applies rotation force 11b ... Part where rotation force is applied 12 ... Casing 13 ... Drilling tool 13a ... Drill rod 13b ... Down the hole drill 13c ... Hammer bit 21 ... Rotation constraint table 22 ... Support leg 22a ... Small rotary drive 22b ... Small casing 22c ... Small drilling tool 23 ... Rotation restraint mechanism 31 ... Small drill rod 32 ... Small down the hole drill 33 ... Small hammer bit 34 ... Main body opening 35 ... Support leg Opening 41: Outer shell support Holding member 42 ... Constraining block 42a ... Guide groove 43 ... Guide member 51 ... Rotation driving device 51a ... Part that applies rotation force 51b ... Part where rotation force is applied 52 ... Air swivel 53 ... Drilling tool 53a ... Drill rod 53b ... Down the hole drill 53c ... Hammer bit 61 ... Rotary driving device 61a ... Rotation force applying part 61b ... Rotation force application part 63 ... Drilling tool 63b ... Down the hole drill 63c ... Hammer bit 71 ... Hydraulic cylinder S ... Pier J … Ground mountain B… bolt

Claims (5)

(57) [Claims] 1. A rotating force applying means which is suspended directly or indirectly by a crane and includes a rotating force applying portion and a rotating force applying portion, and is provided integrally with the rotating force applying portion. A casing, and a drilling tool for applying a necessary rotating force to the drilling by the rotating force applying means, the drilling tool being inserted into the casing; A rotating reaction force receiving means for receiving a rotating reaction force generated in the casing, wherein the rotating reaction force receiving means is directly or indirectly hung by a crane, restrains rotation of the casing, and is attached to the casing. A rotation constraint table that can be moved along; a rotation constraint table that is provided integrally with the rotation constraint table, supports the rotation constraint table by being driven into the ground, and allows remote control of driving and pulling out. A drilling device, comprising: 2. The drilling apparatus according to claim 1, wherein the rotational force applying means has a portion for applying the rotational force provided integrally with the rotation restriction table. 3. The apparatus according to claim 1, wherein the rotational force applying means is provided inside the casing.
A drilling device according to claim 1. 4. The rotation restriction table according to claim 1, further comprising a support leg position moving unit configured to move the position of the support leg when the position of the casing is fixed. The drilling device according to claim 1. 5. The support leg is provided integrally with at least one of the support leg rotation force applying means and the support leg rotation force application means provided integrally with the rotation restriction table. And a supporting leg drilling tool, to which a rotating force required for drilling is applied by the supporting leg rotating force applying means, inserted into the supporting leg casing. The drilling device according to any one of claims 1 to 4, characterized in that it is characterized by: