JP3724784B2 - Drilling rig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drilling device that uses a casing to dig a hole deeper than the hole diameter in the ground, and in particular, the collapse of the bottom of the hole and the side wall of the drilling hole when the casing is pulled up by a newly provided leader. It is related with the excavation apparatus which prevented the collapsing work and the work effort for preventing rotation of an auger was abbreviate | omitted.
[0002]
[Prior art]
Conventionally, the auger is directly hung on the hook at the tip of a crane, etc., and the casing and the excavating part that is inserted into the casing and excavated are hung at the lower part of the auger, and the casing is held in a non-rotating state to match the excavation. Excavating while inserting into the ground. Further, a down-the-hole hammer or an auger screw is used for an excavation part that is inserted into the casing and excavates. Down-the-hole hammers are devices that rotate and excavate while hitting with air.
[0003]
When down-the-hole hammers are used as the excavation part, during excavation, the drilling soil is blown up to the ground using air that hits the down-the-hole hammer, but some drilling soil is not blown up by air. Deposited on the bottom of the hole. As a result, the inconvenience of lowering the excavation capacity arises, so the casing that is suspended in the auger and inserted in the hole is lifted up slightly, air is blown into the bottom of the hole, and the sediment accumulated at the bottom of the hole is blown away. ing.
[0004]
[Problems to be solved by the invention]
However, when a down-the-hole hammer is used as an excavation part, if the casing is pulled up a little from the inside of the hole in order to remove earth and sand accumulated at the bottom of the hole, there is a disadvantage that the side wall on the bottom side where the casing is pulled up collapses. As a result, both the sediment accumulated on the bottom of the hole and the collapsed sediment have to be removed, and there is a disadvantage that the excavation work efficiency is reduced accordingly.
[0005]
In addition, since the casing and the excavation part are suspended at the lower part of the auger, it is not possible to lift only the excavation part while leaving the casing in the ground. For this reason, after excavation, the casing and the excavation part are removed from the excavation hole. However, when the casing is lifted from the excavation hole, a part of the side wall of the excavation hole collapses.
[0006]
Moreover, since the excavation part suspended by the auger is rotated by the motor in the auger, when the excavation part is rotated and excavated in the casing, the auger is rotated by the reaction and the excavation part is not rotated and excavated relatively. In order to prevent this, it is necessary to fix the auger so that it does not rotate due to the reaction by stretching the wire rope etc., and the trouble of fixing the auger with the wire rope before excavation and the removal work after excavation is troublesome. It was.
[0007]
The present invention has been devised in view of the problems as described above, and has been devised to solve the problems. The object of the present invention is to suspend a casing on a newly provided leader and place the casing in the ground. Leave only the excavation part suspended by the auger from the inside of the casing to prevent the bottom of the hole and the side wall of the excavation hole from collapsing when the casing is pulled up. An object of the present invention is to provide an excavating apparatus that can hold the direction slidably to prevent the rotation of the auger and can save the labor for preventing the rotation of the auger.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention suspends a leader and an auger separately on a suspension board suspended from a crane or the like via a wire rope, and allows the auger to slide in the vertical direction on the leader. held, the lower part of the reader with Jisuru hanging casing and connected with the casing mounting platen in the lower part of the reader is connected with the casing mounting platen on the top of the casing which is inserted into the ground, the casing at the bottom of the auger It consists of means which suspended the excavation part inserted in the interlocking connection.
[0009]
Here, a casing mounting plate that protrudes to the lower side of the reader and suspends the casing at a position directly below the auger is attached to the lower portion of the reader. Moreover, the excavation part inserted in a casing consists of a down the hole hammer, and the end of an air hose is connected to the connection part of the down the hole hammer and auger of an excavation part.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described more specifically based on the embodiments of the invention described in the drawings.
Here, FIG. 1 is an overall side view including a partial cross section, FIG. 2A is a plan view of the casing mounting plate, and FIG. 2B is a side view including a partial cross section of the casing mounting plate.
[0011]
In the figure, the excavator 1 includes a suspension board 2 suspended by a crane (not shown), a leader 3 and an auger 4 separately suspended by the suspension board 2, and a casing suspended by a lower portion of the leader 3. 5 and an excavation part 6 suspended in the lower part of the auger 4 and inserted into the casing 5.
[0012]
The suspension board 2 is a member that separately suspends the leader 3 and the auger 4, has a thick steel plate-like structure, and is suspended by a crane or the like (not shown). The suspension board 2 has a suspension 2a attached to the center of the upper surface thereof. The lower end side of the suspension tool 2a is pivotally supported on the upper surface of the suspension board 2 so as to be rotatable.
[0013]
The suspension tool 2a attached to the upper surface of the suspension board 2 is hooked on a hook b connected to the lower end of a wire rope a suspended from the tip of a crane or the like (not shown). 2a, a hook b, a wire rope a and the like are suspended by a crane or the like (not shown).
[0014]
The leader 3 holds the auger 4 slidably in the vertical direction, and suspends the casing 5 at the lower part thereof. The leader 3 is attached to a mounting plate 2b attached to the right side from the center of the lower surface of the suspension board 2 in FIG. It is suspended via a leader suspension wire rope 2c. The leader 3 functions to prevent the auger 4 from rotating due to a reaction during the rotary excavation of the excavation unit 6. Thereby, the operation | work which stretches a wire rope etc. radially beforehand and fixes the auger 4 can be made unnecessary.
[0015]
Further, by suspending the casing 5 below the leader 3, the excavation part 6 can be moved up and down independently of the casing 5, and only the excavation part 6 is left with the casing 5 left in the ground. It is possible to pull up, and it is possible to prevent inconveniences associated with lifting the excavation part 6 and the casing 5, collapse of the side wall of the bottom of the excavation hole, collapse of the side wall of the excavation hole, and the like.
[0016]
On the left and right sides of the front side of the reader 3 on the side facing the auger 4, guide rods 3a are provided in the vertical direction, and on the left and right sides on the front side of the auger 4 facing the guide rod 3a. By engaging the guide receiver 4a provided in the vertical direction, the auger 4 is slidably held in the vertical direction by the reader 3, and the auger 4 can freely move in the vertical direction, but the rotational movement is prevented. Will be.
[0017]
A casing mounting board 7 is provided below the reader 3. The casing mounting board 7 is for mounting the casing 5 suspended at the lower part of the reader 3 to the lower part of the reader 3 so as to be directly below the auger 4. The casing mounting board 7 projects to the lower side of the reader 3 and has a structure in which the casing 5 is suspended just below the auger 4.
[0018]
The leader 3 and the auger 4 are suspended by the suspension board 2 in parallel, and when the casing 5 is suspended as it is under the leader 3, the casing 5 does not come directly under the auger 4. The casing mounting board 7 is for solving this problem. The casing mounting board 7 projects directly below the auger 4 and suspends the casing 5 below the leader 3.
[0019]
The casing mounting board 7 includes a leader connecting board 7a connected to the lower part of the leader 3, a casing connecting board 7b connected to the upper part of the casing 5, and a connecting board 7c for connecting the two. The leader connecting board 7a and the casing connecting board 7b are connected by a connecting board 7c with a gap in the horizontal direction. The casing connection board 7b has a cylindrical shape, and both upper and lower ends are opened, and the upper end side of the casing 5 is inserted and connected to the lower side of the casing connection board 7b.
[0020]
The auger 4 is provided with a motor and a speed reducer for driving the excavation part 6 inside, and an excavation part 6 inserted into the casing 5 is extended downward in the lower part thereof. The auger 4 is suspended from the suspension board 2 via an auger suspension wire rope 2d suspended from the center of the lower surface of the suspension board 2 to the left side in FIG. As described above, the auger 4 is provided with guide receivers 4a in the vertical direction on the left and right sides of the front side facing the reader 3, and the auger 4 is connected to the reader 3 via the guide receiver 4a and the guide rod 3a. Is slidable in the vertical direction.
[0021]
The casing 5 has a cylindrical shape with both ends opened, and is inserted into the excavation ground together with excavation, and functions to prevent the side wall of the excavation hole from collapsing during excavation. As described above, the upper end side of the casing 5 is inserted and connected to the lower side of the casing connection board 7b of the casing attachment board 7, and the casing 5 is suspended by the lower part of the reader 3 via the casing attachment board 7. Yes. The casing 5 is raised and lowered by raising and lowering the reader 3. For the casing 5, for example, a steel pipe is used.
[0022]
The excavation part 6 is a device that is inserted into the casing 5 to excavate the ground. The upper end side of the excavation part 6 is suspended and linked to the lower part of the auger 4. The excavating part 6 moves up and down in the casing 5 by raising and lowering the auger 4. Thus, the excavation part 6 is moved up and down by the auger 4, and the casing 5 is moved up and down by the reader 3, and the excavation part 6 and the casing 5 are moved up and down independently. For example, a down-the-hole hammer is used for the excavation part 6.
[0023]
The down-the-hole hammer of the excavation unit 6 is a device that rotates and excavates while hitting with air. For this reason, one end of the air hose 6 a is connected to the connecting portion between the down-the-hole hammer and the auger 4 of the excavation unit 6. The other end of the air hose 6a is connected to an air supply device (not shown). This down-the-hole hammer has a feature that the excavated earth and sand can be blown up inside the casing 5 and discharged to the outside using air.
[0024]
Further, a casing rotation prevention device 8 for preventing the casing 5 inserted into the excavated ground from rotating during excavation by the excavating part 6 is installed on the outer periphery of the casing 5 on the excavated ground surface. The casing rotation prevention device 8 is configured to engage the groove portion formed in the longitudinal direction on the outer peripheral side surface of the casing 5 to prevent the rotation of the casing 5. The casing rotation prevention device 8 is generally used in excavation methods using the casing 5.
[0025]
Next, the operation based on the configuration of the embodiment of the invention will be described below.
The excavator 1 is suspended by a crane or the like (not shown) and moved above the excavated ground, and then the lower end of the casing 5 suspended below the leader 3 is installed on the excavated ground. At this time, the casing rotation prevention device 8 that prevents the rotation of the casing 5 is installed on the excavation ground, and the lower end side of the casing 5 is inserted and installed inside the casing rotation prevention device 8.
[0026]
Then, the excavation part 6 inserted in the casing 5 is driven. When the excavating part 6 is made of a down-the-hole hammer, a motor (not shown) of the auger 4 is driven and an air supply device (not shown) is driven. By these driving, the excavating part 6 made of the down-the-hole hammer is driven in the casing 5 to rotate and excavate while hitting with air.
[0027]
The excavated earth and sand are blown up through the casing 5 by air and discharged from the upper end side of the casing connecting board 7b of the casing mounting board 7 in which the upper end side of the casing 5 is inserted and connected. According to the excavation hole of the ground, the casing 5 and the excavation part 6 are inserted into the ground.
[0028]
When a down-the-hole hammer is used as the excavating section 6, during excavation, the excavated soil is blown up to the ground using air that blows the down-the-hole hammer, but some excavated soil is blown up with air. Without depositing at the bottom of the borehole. As a result, there arises a disadvantage that the digging capacity is lowered, and therefore the casing 5 suspended from the lower portion of the leader 3 via the casing mounting plate 7 and inserted into the digging hole is slightly pulled up.
[0029]
At this time, since the casing 5 is suspended by the leader 3 and the excavation part 6 is suspended by the auger 4, the auger 4 is slid upward along the leader 3 to slightly lift it, and the leader 3 is left as it is. Thus, only the excavation part 6 in the casing 5 can be slightly lifted. Since the casing 5 is not pulled up, the bottom of the excavation hole is surrounded by the casing 5, so that even if only the excavation part 6 is pulled up, it does not collapse.
[0030]
And after raising only the excavation part 6 in the casing 5 a little, air is blown into the bottom of the excavation hole, and excavation sediment deposited on the bottom of the hole is blown up and removed. After the removal, the auger 4 which has been slightly lifted is lowered, the excavation part 6 suspended by the auger 4 is lowered in the casing 5, and excavation by the excavation part 6 is continued again.
[0031]
When the ground is excavated by the excavating unit 6, the excavating unit 6 is rotating, and the rotational force of the excavating unit 6 is obtained by a motor inside the auger 4 to which the excavating unit 6 is linked. For this reason, when the excavating part 6 rotates and excavates, a rotational force acts on the auger 4 due to the reaction, but the auger 4 is held by the reader 3 so as to be slidable in the vertical direction. This prevents the auger 4 from rotating.
[0032]
The leader 3 on which the rotational force of the auger 4 acts is suspended by a casing 5 inserted into the ground at the lower part thereof, and this casing 5 is held in a non-rotating state by a casing rotation prevention device 8. Therefore, the leader 3 does not rotate around the auger 4 due to the rotational force of the auger 4.
[0033]
In this way, the rotation of the auger 4 due to the reaction that occurs during the rotary excavation of the excavation part 6 can be reliably prevented by the casing rotation prevention device 8 via the reader 3 and the casing 5. For this reason, it is not necessary to fix the auger 4 so as not to rotate with a wire rope or the like as in the prior art, the work for that can be omitted, and the excavation work process can be shortened.
[0034]
Then, after excavating to a predetermined depth, only the excavation part 6 is pulled up while leaving the casing 5 in the ground. The excavation part 6 is pulled up by pulling up the auger 4 holding it. At this time, the reader 3 is stopped. Since the auger 4 is held by the leader 3 so as to be slidable in the vertical direction, the leader 3 that is stopped when the auger 4 is pulled up is not hindered.
[0035]
After the excavation part 6 is pulled out from the casing 5, a support pile (not shown) is inserted into the casing 5, and then the casing 5 is pulled up to complete the operation. The casing 5 is pulled up by pulling up the leader 3. As described above, the auger 4 is held by the leader 3 so as to be slidable in the vertical direction. Therefore, the auger 4 stopped when the leader 3 is pulled up. Will not interfere.
[0036]
When the support pile is inserted into the excavation hole, since the casing 5 is inserted into the ground, the side wall of the excavation hole is compared with the case where the support pile is inserted after the casing and the excavation part are pulled out as in the conventional case. The support pile can be smoothly inserted into the excavation hole.
[0037]
The present invention is not limited to the embodiment of the invention described above, and various modifications can be made without departing from the spirit of the invention. In the above-described embodiment, the excavator 6 is described as a down-the-hole hammer. However, the excavator 6 is not limited to this, and an auger screw can be used instead.
[0038]
【The invention's effect】
As is clear from the above description, according to the excavator according to the present invention, the leader and the auger are separately suspended on the suspension board suspended from a crane or the like, and the auger can be slid in the vertical direction on the leader. The casing is suspended at the lower part of the leader, the excavating part inserted into the casing is interlocked and suspended at the lower part of the auger, and the casing is suspended by the newly provided leader. In the ground, only the excavation part suspended by the auger can be lifted from the inside of the casing, so that the collapse of the bottom of the hole and the collapse of the side wall of the excavation hole can be prevented. In addition, by holding the auger slidable in the vertical direction with the newly provided reader, it is possible to prevent the rotation of the auger and to eliminate the labor for preventing the rotation of the auger. It plays.
[Brief description of the drawings]
FIG. 1 is an overall side view including a partial cross section showing an embodiment of the present invention.
FIG. 2A is a plan view of a casing mounting plate showing an embodiment of the present invention.
(B) is a side view including a partial cross-section of a casing mounting plate showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavator 2 Suspension board 2a Suspension tool 2b Mounting plate 2c Leader suspension wire rope 2d Auger suspension wire rope 3 Leader 3a Guide rod 4 Auger 4a Guide receiver 5 Casing 6 Excavation part 6a Air hose 7 Casing attachment board 7a Leader connection panel 7b Casing connection panel 7c Connection panel 8 Casing rotation prevention device a Wire rope b Hook

Claims (3)

The leader and auger are separately suspended on a suspension board that can be hung on a crane or the like via a wire rope, and the auger is slidable in the vertical direction on the leader and connected to the lower part of the leader with a casing mounting board. bottom of the reader with Jisuru hanging the casing is connected with the casing mounting platen on the top of the casing which is inserted into the ground Te, hung interlockingly connected the drilling unit to be inserted into the casing at the bottom of the auger A drilling rig characterized by that. 2. The excavator according to claim 1, wherein a casing mounting plate that protrudes to the lower side of the leader and suspends the casing just below the auger is attached to the lower part of the leader. The excavation apparatus according to claim 1, wherein the excavation part inserted into the casing comprises a down-the-hole hammer, and one end of the air hose is connected to a connection part between the down-the-hole hammer and the auger in the excavation part.

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