JPH0532552B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vertical hole excavator for excavating a vertical hole underground.

[Technical background of the invention and its problems]

2. Description of the Related Art Vertical hole excavators that excavate vertical holes such as pile holes in the ground at construction sites, civil engineering sites, etc., use excavators such as augers and drilling baskets.

This type of vertical hole excavator includes a mast, a rectangular cylindrical outer kelly bar that is movable up and down along the mast, a kelly bar rotation mechanism that rotates the outer kelly bar, and a kelly bar inside the outer kelly bar. and an inner kelly bar that is rotatable integrally with the outer kelly bar and inserted into the outer kelly bar so that it can be raised and lowered. An excavating body such as a drilling bucket or a drilling bucket is attached to the lower end of the inner kelly bar.

This vertical hole excavator moves the excavation body into the ground by lowering the Kelly bar while rotating the Kelly bar consisting of the outer Kelly bar and the inner Kelly bar. When the outer Kelly bar is rotated by the Kelly bar rotation mechanism, , the inner Kelly bar rotates together with this outer Kelly bar, and the excavation body is rotated. Further, the Kelly bar is forcibly pushed down by a Kelly bar pushing down cylinder provided on the mast, or is lowered by its own weight, and the excavation body attached to the lower end of the inner Kelly bar is Before the inner Kelly bar is extended, it is pushed by the lower end of the outer Kelly bar and propelled into the ground.

In addition, the inner Kelly bar is used when drilling a hole deeper than the maximum drilling depth (the depth of the drilling hole when the outer Kelly bar is lowered to its lowering limit) when the Kelly bar is reduced. This inner kelly bar is constructed by winding up a hanging rope to pull up the inner kelly bar and the outer kelly bar whose lower end is supported by the excavation body at the lower end of the inner kelly bar. Below the outer Kelly bar (inside the drilled hole) due to its own weight
will be lowered to In addition, a lock pin is provided at the lower end of the outer kelly bar to lock the lowered inner kelly bar by fitting into a lock hole provided at the upper end of the inner kelly bar by a spring force. The inner kelly bar is locked to the outer kelly bar by this locking pin. After lowering the inner Kelly bar to extend the Kelly bar in this manner, the outer Kelly bar may be lowered while rotating the outer Kelly bar in the same manner as described above, thereby making it possible to drill the vertical hole deeper.

By the way, when a vertical hole is excavated in the ground by the above-mentioned vertical hole excavator, the earth and sand excavated by the excavation body is removed by pulling up the Kelly bar appropriately during excavation to bring the excavation body above the ground surface. When excavating in an extended state, the inner kelly bar and the excavated body at its lower end remain in the vertical hole even if the outer kelly bar is pulled up. This is done by releasing the inner Kelly bar and pulling it up into the outer Kelly bar.

However, in the past, in order to unlock the inner kelly bar from the outer kelly bar, the locking pin had to be manually removed from the locking hole of the inner kelly bar, which was a very difficult and time-consuming process, so it was difficult to remove the soil every time. If the locking pin is removed manually, there is a problem in that the efficiency of the excavation operation is reduced due to the time required for soil removal.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and its purpose is to automatically release the lock of the inner kelly bar from the outer kelly bar without manual intervention. To provide a vertical hole excavator capable of greatly improving excavation work efficiency by shortening the time required for earth removal work.

[Summary of the invention]

That is, the present invention provides a lock release guide member on the lower side of the Kelly bar rotating mechanism in correspondence with the height of the inner Kelly bar lock pin when the outer Kelly bar is pulled up, and on the outer side of the lower end of the outer Kelly bar. According to the present invention, a lock release mechanism is provided which releases the lock pin from the lock hole of the inner kelly bar by being guided by the lock release guide member when the outer kelly bar is rotated by a predetermined angle. Since the lock pin can be removed from the lock hole of the inner kelly bar by rotating the kelly bar with the kelly bar pulled up, the lock of the inner kelly bar with respect to the outer kelly bar can be automatically released without manual work.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking a self-propelled vertical hole excavator as an example. In this embodiment, a vertical hole is dug by forcibly pushing down the Kelly bar with a cylinder.

First, I will explain the outline of the self-propelled vertical hole excavator.
In Fig. 3, 1 is a traveling vehicle body, and 2 is this vehicle body 1.
This is a swivel base mounted on the swivel base 2. A driver's cab 3 is provided on the swivel base 2, and an engine 4, a winch 5, etc. are mounted on the swivel base 2.

Reference numeral 6 denotes a mast whose base end is pivotally supported on the swivel base 2 and is provided so as to be able to rise and fall. It is now supported by

Reference numeral 9 denotes a lifting unit that is supported on the front side of the mast 6 so as to be able to rise and fall, and this lifting unit 9 is adapted to be lifted and lowered by a predetermined stroke by a push-down cylinder 10 provided on the mast 6. .

11 is a kelly bar provided on the front side of the mast 6 so as to be movable up and down along the mast 6;
As shown in FIGS. 5 to 7, the Kelly bar 11 is a two-stage extendable bar consisting of an outer Kelly bar 12 and an inner Kelly bar 13.

The outer Kelly bar 12 has a rectangular cylindrical shape with a rectangular cross section over its entire length except for the lower end, and the lower end portion of the outer Kelly bar 12 is a cylindrical portion whose inner diameter is slightly smaller than the inscribed circle of the rectangular cylindrical portion. At the lower end of this cylindrical part, there is a cylindrical lower cylinder 12 having the same diameter as this cylindrical part.
a is connected by a bolt. Further, as shown in FIG. 3, a large number of chuck receivers 14, 14 are protruded at equal intervals over almost the entire length of the outer Kelly bar 12, as shown in FIG.
Among these chuck holders 14, 14, the lowest chuck holder is a rectangular chuck holder 14a whose upper and lower surfaces are chuck receiving surfaces as shown in FIG. 8, and all other chuck holders 14, 14 are This tapered chuck holder has an upper surface as a chuck receiving surface, and a portion below the chuck receiving surface as a tapered surface that slopes downward and inward (towards the outer Kelly bar).

The inner kelly bar 13 has a cylindrical shape with an outer diameter that slides into contact with the lower cylindrical portion of the outer kelly bar 12, and the outer kelly bar 12 Convex strips 15, 15 are provided in sliding contact with the inner surface of the rectangular tube portion and protrude along the axial direction of the inner Kelly bar. The inner Kelly bar 13 is inserted into the outer Kelly bar 12 so as to be able to rise and fall.
3 is designed to rotate together with the outer Kelly bar 12 via the protrusions 15, 15 on its upper end side. A seal ring a is provided on the inner periphery of the lower end of the lower cylinder 12a of the outer Kelly bar 12, as shown in FIGS. 7 and 8, for sealing the gap between the inner Kelly bar 13.

In addition, in Fig. 3, 16 is the outer Kelly bar 1.
This Kelly bar support 16 supports the upper end of the mast 6, and is attached to a support member 17 that is provided on the mast 6 so as to be movable up and down.
Note that this support member 17 is made to be expandable and retractable and has a built-in buffer spring, and is adapted to absorb shocks caused by swinging movement of the upper end of the Kelly bar.

The Kelly bar support 16 is shown in FIGS. 4 and 7.
As shown in the figure, a cylindrical portion 16a having an inner diameter larger than the inscribed circle of the rectangular cylindrical portion of the outer Kelly bar 12 and a length slightly larger than the length of the protrusions 15, 15 of the inner Kelly bar 13 is formed on the lower end side. The upper end of the outer Kelly bar 12 is rotatably supported by the lower end of the cylindrical portion 16a via a bearing 18. Further, at the upper end of the Kelly bar support 16, there is an introduction hole 19 for an inner Kelly bar hanging rope 27, which will be described later.
is provided.

Further, as shown in FIG. 8, the lifting unit 9 is provided with a rotating body 20 inside thereof, and the outer Kelly bar 12 is inserted through this rotating body 20 so as to be able to rise and fall. It is designed to be rotated.

As shown in FIGS. 8 and 9, the rotating body 20 has an outer Kelly bar 1 at the center of a gear wheel 21.
2 is fixed with an outer Kelly bar holding cylinder 22 having a square through hole 22a which is slidably fitted in the length direction. Bear rig 23,2
3 to the casing 9a of the lifting unit 9, and is rotated by rotationally driving the gear wheel 21 by a hydraulic motor 24 (see FIG. 3) mounted on the lifting unit 9.

The outer Kelly bar 12 is inserted into the through hole 22a of the outer Kelly bar holding cylinder 22, and is held by the outer Kelly bar holding cylinder 22 so as to be movable up and down and to rotate together with the outer Kelly bar holding cylinder 22. It is adapted to be rotated by the rotation of the rotating body 20. The through hole 22a of the outer Kelly bar holding cylinder 22 has chuck receivers 14, 14 and 14a of the outer Kelly bar 12 on both sides thereof.
It has a shape in which escape parts 22b, 22b are provided.

Further, in FIG. 8, reference numerals 25, 25 are a pair of left and right outer Kelly bar pressing chuck claws provided at the upper end of the outer Kelly bar holding cylinder 22 of the rotating body 20 so as to be movable towards and away from the outer Kelly bar 12; The chuck claws 25, 25 are brought into contact with the outer surface of the outer Kelly bar 12 by a spring force, and are separated from the outer Kelly bar 12 by a solenoid 26. The chuck pawls 25, 25 for pushing down the outer kelly bar come into contact with the chuck receiver 14a or 14 of the outer kelly bar 12 from above when the elevating unit 9 is pushed down by the extension of the push-down cylinder 10, and the outer kelly bar 12 is pushed down. The outer kelly bar 12 is used to push down the lowering stroke of the lifting unit 9, and in the state before starting drilling of the vertical hole, the lowermost chuck holder 14a is pushed down by the chuck pawl 2 as shown in FIG.
5 and 25 from below, and is supported by the chuck claws 25 and 25.

On the other hand, in FIG. 3, reference numeral 27 denotes an inner Kelly bar hanging rope that is hoisted and let out by the winch 5 mounted on the swivel base 2 on the traveling vehicle body 1, and this hanging rope 27 is connected to the guide sheave 28,
28 and is lowered from the upper end of the mast 3, and is connected to the upper end of the inner kelly bar 13 via a rotary joint 29 (see FIG. 7) to suspend and support the inner kelly bar 13.

The inner kelly bar 13 is in the state before the start of vertical hole drilling and when the vertical hole is being drilled with the kelly bar 11 contracted, it is in the state of being pulled into the outer kelly bar 12, and the kelly bar 11 is extended to drill the vertical hole. When the hanging rope 27 is let out, the outer Kelly bar 12 is lowered.
As shown in the figure, an excavating body mounting bracket 31 to which an excavating body 30 such as an auger or a drilling bucket is attached is removably fitted and fixed by a pin 32. In addition, in FIG. 3, the drilling body 30
The figure shows the auger set.

When the excavating body 30 is excavating a vertical hole with the Kelly bar 11 contracted, the upper end of its mounting bracket 31 is pushed by the lower cylinder 12a of the outer Kelly bar 12, as shown in FIG. When the Kelly bar 11 is extended to excavate a vertical hole, it is pushed by the inner Kelly bar 13 and pushed into the ground.
The inner kelly bar 13, which is lowered below the outer kelly bar 12 when the outer kelly bar 12 is extended and the vertical hole is excavated, is locked to the outer kelly bar 12 in the following manner.
It is designed to be pushed down along with 2.

That is, the inner kelly bar 13 has lock holes 33 formed on both sides of its upper end by cutting out the protrusions 15, 15 provided on the outer surface of the inner kelly bar, for example.
33 are provided as shown in FIGS. 1 and 7, and the outer Kelly bar 12 is provided with the outer Kelly bar 12, as shown in FIGS. A pair of Kelly barlock pins 3
4 and 34 are provided. This lock pin 3
4 and 34 are each pivotally supported by one end of a rotary lever 36 whose intermediate portion is pivotally supported by a bracket 35 protruding from the outer surface of the outer Kelly bar 12, and when the rotary lever 36 is rotated, the outer Kelly bar 12 is rotated. The rotary lever 36 is provided so as to be protruded and retracted into the outer Kelly bar 12 through the provided opening, and the rotary lever 36 is rotated by a coil spring 37 interposed between the other end side and the outer Kelly bar 12. 34 is given a rotational force in the direction of protruding into the outer Kelly bar 12. That is, the lock pin 34 is always in contact with the outer surface of the inner kelly bar 13 by the spring force of the coil spring 37, and when the inner kelly bar 13 is lowered below the outer kelly bar 12, the lock pin 34 locks into the lock hole 33 of the inner kelly bar 13. lock pin 34
When the lock pin 34 comes to a position facing the inner kelly bar 13, the lock pin 34 is fitted into the lock hole 33 by spring force and locks the inner kelly bar 13.

Further, in FIGS. 1 and 8, 38 is a cylindrical cover provided at the bottom of the lifting unit 9. At the lower end of this cover 38, the outer Kelly bar 12 and the rotating An end plate 38a is provided with an opening 38b through which the levers 36, 36 can pass.

Further, on both sides of the inside of the cover 38, an arc-shaped lock release guide plate 39 is provided which curves along the circumferential direction of the cover 38 from the starting end side to the terminal end side and away from the outer Kelly bar 12 side. 39 is fixedly provided on the cover 38, and these lock release guide plates 39, 39 are connected to the outer kelly bar 12.
The heights of the lock pins 34, 34 are provided to correspond to the height of the lock pins 34, 34 when the chuck receiver 14a at the lowermost end is received by the chuck pawl 25 for pushing down the outer kelly bar as shown in FIG.

Further, at the other end of the rotary lever 36 which pivotally supports the lock pin 34, a lock release roller 40 is attached which rolls into contact with the lock release guide plate 39. This lock release roller 40 is
By rotating the outer Kelly bar 12 in the direction of the arrow shown in FIG. 1 with the outer Kelly bar 12 pulled up, it rides on the lock release guide plate 39, and is pushed by this lock release guide plate 39 and rotates. Lever 3
6 is rotated against the spring force of a coil spring 37 in a direction to remove the lock pin 34 from the outer Kelly bar 12, and the lock pin 34 is pulled out from the inner Kelly bar by this lock release roller 40 and the rotating lever 36. A lock release mechanism for releasing the bar 13 from the lock hole 33 is constructed. FIG. 2 shows the unlocked state in which the lock pin 34 has been removed from the lock hole 33 of the inner kelly bar 13, and when the outer kelly bar 12 is in the state shown in FIG. When the locking pin 34 is rotated by a predetermined angle to the state shown in FIG. 2 where it rides on the starting end side of the inner kelly bar 13, the locking pin 34 separates from the locking hole 33 of the inner kelly bar 13, and the locking of the inner kelly bar 13 is released.

Further, this vertical hole excavator is capable of excavating a vertical hole not only with an excavator 30 such as an auger or a drilling bucket, but also with a roller bit. A soil discharge port 41 is opened on the side surface of the upper end of the inner Kelly bar 13, and a soil discharge port 41 is opened at the upper end of the inner Kelly bar 13 to discharge soil from inside the inner Kelly bar 13 to the soil discharge port 41. A guiding weir plate 42 is provided diagonally. Also, among these, Kelly Bar 13 is
When excavating a vertical hole with a roller bit, the first
As shown in FIG. 7, the protrusions 15, 15 are pulled up into the cylindrical portion 16a of the Kelly bar support 16, and the inner Kelly bar 13 is provided on the upper end side surface of the Kelly bar support 16. A lock pin 44 is provided which fits into a lock hole 43 and locks the inner kelly bar 13 when it is pulled up. This lock pin 44 is normally pressed by a spring force so as to protrude into the Kelly bar support 16, and when the inner Kelly bar 13 is pulled up, it is pulled in by a solenoid so as not to hit the inner Kelly bar 13, and when the inner Kelly bar 13 is pulled up. Later, when the solenoid is de-energized, it is pushed out again by the spring force and fitted into the lock hole 43 of the inner kelly bar 13, and the excitation and de-energization operations of the solenoid are performed in the driver's cab 3. Further, a suction hose connection pipe 45 in a bent tubular shape extending to the side is provided at the upper end of the Kelly bar support 16, and the dirt discharge port 41 of the inner Kelly bar 13 that has been pulled up is connected to the suction hose. Kelly bar support 16 for tube 45
It is adapted to match the opening inward.

10 to 16 show the process of excavating a vertical hole using an excavator 30 such as an auger or a drilling bucket. Preparation for excavation in this case is performed as follows.

First, attach the chuck holder 14a at the lowest end of the outer Kelly bar 12 to the chuck claw 25 for pushing down the outer Kelly bar.
While supported above, the inner kelly bar 13 is lowered by letting out the hanging rope 27, and an excavating body 30 such as an auger or a drilling bucket is attached to the lower end of the inner kelly bar 13 via an excavating body mounting bracket 31. Thereafter, the winch 5 winds up the lifting rope 27 to lift the inner kelly bar 13, and the lower end of the lower cylinder 12a of the outer kelly bar 12 is supported by the upper end of the excavation body mounting bracket 31 attached to the lower end of the inner kelly bar 13.

After completing the above-mentioned excavation preparations, the solenoid 26 that retracts the chuck pawl 25 for pushing down the outer Kelly bar is energized by remote control from the operator's cab 3, and this chuck pawl 25 is connected to the chuck pawl 14a at the lowermost end.
With the kelly bar 11 detached from the ground, a hanging rope 27 is let out from the winch 5 at low speed to lower the entire kelly bar 11 until the excavation body 30 reaches the ground surface. In addition,
In this case, if the lock release mechanism provided at the lower end of the square tube of the outer Kelly bar 12 is not in the position shown in FIG. 1, the lock release mechanism will hit the end plate 38a of the cover 38. , the rotating body 20 is rotated to rotate the Kelly bar 11 until the lock release mechanism is in the position shown in FIG. 1, and then the Kelly bar 11 is lowered. The chuck pawl 25 is activated by a spring force by cutting off the excitation of the solenoid 26 after lowering the Kelly bar 11 until the chuck pawl 14a at the lowest end of the outer Kelly bar 12 is below the chuck pawl 25. The outer surface of the outer Kelly bar 12 is brought into contact with the outer surface of the outer Kelly bar 12 again.

After lowering the Kelly bar 11 until the excavation body 30 reaches the ground surface as described above, the hydraulic motor 2
4, the rotating body 20 in the lifting unit 9 is rotated to rotate the outer Kelly bar 12 together with the inner Kelly bar 13, and the rotation of the Kelly bar 11 rotates the excavating body 30, and at the same time, the push-down cylinder 10 is extended and the lifting unit 9 is rotated. I'm going to lower it. When the lifting unit 9 is lowered in this way, the chuck pawl 25 provided on the rotating body 20 that descends together with the lifting unit 9 comes into contact with the chuck holder 14a at the lowest end of the outer Kelly bar 12 from above, causing the lifting unit 9 to move downward. Kelly bar 12 will now be pushed down. After this, while letting out the hanging rope 27 from the winch 5, the outer Kelly bar 12 can be pushed down via the chuck claw 25 by the pushing force of the push-down cylinder 10. When the outer Kelly bar 12 is pushed down, the lower part of the outer Kelly bar 12 The excavation body mounting bracket 31 is pushed down by the cylinder 12a, and the inner Kelly bar 13 is lowered together with the outer Kelly bar 12 via this excavation attachment bracket 31, so that the entire Kelly bar 11 is lowered together with the Kelly bar support 16 and the excavation body 30, and the excavation body 30 is lowered. The body 30 has a vertical hole 50 as shown in FIG.
It is pushed underground and propelled while excavating.

Further, after the push-down cylinder 10 is extended to its extension limit, the push-down cylinder 10 is contracted and the lifting unit 9 is pulled up, and the chuck claw 25 for pushing down the outer Kelly bar is connected to the outer Kelly bar 12.
2. Move it onto the next chuck rest 14 at the lowest end. In this case, the lowest chuck holder 14a
Since the chuck holders 14, 14 except for It is pushed back and climbs over the chuck holder 14. After the chuck pawl 25 for pushing down the outer Kelly bar is moved onto the next chuck receiver 14 at the lowest end of the outer Kelly bar 12 in this way, the pushing cylinder 10 is extended while letting out the hanging rope 27 again. Similarly, the outer kelly bar 12 is pushed down by the chuck claw 25 to remove the excavation body 3.
0 into the ground, and by repeating this operation, the excavating body 30 can be propelled into the ground by strokes corresponding to the extension stroke of the pushing cylinder 10, and the vertical hole 50 can be excavated. . FIG. 11 shows the vertical hole 5 being drilled to the maximum depth that can be excavated with the Kelly bar 11 reduced (with the inner Kelly bar 13 retracted into the outer Kelly bar 12).
0 is shown in the excavated state.

Moreover, the earth and sand excavated by the excavation body 30 can be discharged by pulling up the Kelly bar 11 as needed during excavation to bring the excavation body 30 above the ground surface. To discharge the excavated soil, the chuck claw 25 is moved backward by the excitation of the solenoid 26, and the hanging rope 2 is
Wind up Kelly bar 1 as shown in Figure 12.
1 is pulled up, and the lowermost chuck receiver 14a of the outer Kelly bar 12 is supported by the chuck pawl 25. In this case, the Kelly bar 11 is pulled up by stopping the rotation of the Kelly bar 11, but at this time, the lock release mechanism provided at the lower end of the square tube of the outer Kelly bar 12 must be in the position shown in FIG. , this lock release mechanism is the cover 3
The Kelly bar 11 touches the end plate 38a of 8
In this case, rotate the Kelly bar 11 until the lock release mechanism is in a position opposite to the opening 38b of the cover end plate 38a (the position shown in FIG. 1), and the lock release mechanism The Kelly bar 11 is inserted into the cover 38 through the opening 38b of the end plate 38a.
I'll raise it up.

In addition, when excavating a vertical hole 50 that is deeper than the maximum depth that can be excavated with the Kelly bar 11 reduced, the above-mentioned earth removal process is performed after excavating the vertical hole 50 to the maximum depth with the Kelly bar 11 reduced. Similarly, the kelly bar 11 is pulled up, the chuck holder 14a at the lowest end of the outer kelly bar 12 is supported by the chuck pawl 25, and then the hanging rope 27 is let out and the inner kelly bar 11 is moved as shown in FIG.
is lowered into the vertical hole 50. Now, when the inner Kelly bar 13 is lowered until the protrusions 15, 15 on the upper end thereof touch the lower end of the square tube of the outer Kelly bar 12,
The lock hole 33 provided at the upper end of the inner kelly bar 13 is in a state opposite to the lock pin 34 provided at the lower end of the rectangular tube of the outer kelly bar 12, and at this time, the lock pin 34 is connected to the coil spring 3.
The inner kelly bar 13 is fitted into the lock hole 33 of the inner kelly bar 13 with a spring force of 7 to lock the inner kelly bar 13 to the outer kelly bar 12.

After extending the Kelly bar 11 in this way, the rotation of the Kelly bar 11 is started again, and the lifting unit 9 is repeatedly raised and lowered in the same way as when drilling the vertical hole 50 with the Kelly bar 11 contracted. The outer kelly bar 12 is pushed down by the chuck claw 25 in strokes corresponding to the extension stroke of the cylinder 10, and the excavating body 30 is propelled into the ground to excavate the vertical hole 50. FIG. 14 shows a state in which the vertical hole 50 has been excavated to the maximum depth with the Kelly bar 11 extended.

Further, when excavating the vertical hole 50 with the Kelly bar 11 extended, the earth and sand excavated by the excavation body 30 can be removed by pulling up the Kelly bar 11 appropriately during excavation to bring the excavation body 30 above the ground surface. However, when excavating with the Kelly bar 11 extended, the inner Kelly bar 13 and the excavation body 30 at its lower end remain in the vertical hole 50 even if the outer Kelly bar 12 is pulled up. As shown, after pulling up the Kelly bar 11 and supporting the chuck holder 14a at the lowest end of the outer Kelly bar 12 on the chuck pawl 25, the inner Kelly bar 13 is unlocked from the outer Kelly bar 12, and then the hanging rope 27 is wound up. As shown in FIG. 16, the inner Kelly bar 13 is pulled up into the outer Kelly bar 12.

Inner Kelly bar 1 for the above outer Kelly bar 12
3 is unlocked as follows. First, pull up the Kelly bar 11 and remove the outer Kelly bar 12.
When the lowermost chuck holder 14a is supported by the chuck pawl 25 as shown in FIG.
The lock release rollers 40, 40 of the lock release mechanism inserted in the lock release guide plates 39, 3 in the cover 38, as shown in FIGS. 1 and 8,
It will be located at the same height as 9. In this state, the Kelly bar 11 is moved in the direction of the arrow shown in FIG.
When rotated by a predetermined angle, the lock release rollers 40, 40 of the lock release mechanism, which rotate together with the outer Kelly bar 12, ride on the starting ends of the lock release guide plates 39, 39, and the guide plates 39, 39 move the lock release rollers 40, 40 inside (outside). Kelly bar 12 side), thereby rotating the rotating levers 36, 36 against the spring force of the coil spring 37, and the lock pins 34, 34, which are pivotally supported by the rotating levers 36, 36, are rotated. As shown in Figure 2, the lock holes 33, 33 of the inner kelly bar 13
extracted from.

In addition, the lock holes 33, 33 of the inner kelly bar 13
The lock pins 34, 34 extracted from the
Rotate the lock release roller 4 to the state shown in the figure.
0 and 40 from the lock release guide plates 39 and 39, the lock hole of the inner kelly bar 13 is returned to the state where it comes into contact with the outer surface of the inner kelly bar 13 due to the spring force, and the lock hole of the inner kelly bar 13 is lowered again after soil removal. 33, 33.

In this vertical hole drilling machine, as described above, the lifting unit 9 has the inner kelly bar lock pin 3 when the outer kelly bar 12 is pulled up.
Lock release guide plates 39, 39 are provided corresponding to the heights of the outer kelly bars 12 and 34.
When the outer Kelly bar 12 is rotated by a predetermined angle, the lock release guide plate 3 is placed on the outside of the lower end of the square tube.
9, 39 to guide the locking pins 34, 34.
Since a lock release mechanism is provided to remove the lock pins 34, 34 from the lock holes 33, 33 of the inner Kelly bar 13, by rotating the Kelly bar 11 with the outer Kelly bar 12 pulled up, the lock pins 34, 34 are released from the lock holes 33, 33 of the inner Kelly bar 12. It can be removed from 33. Therefore, according to this vertical hole excavator, when the inner kelly bar 13 is pulled up into the outer kelly bar 12, the locking of the inner kelly bar 13 with respect to the outer kelly bar 12 can be automatically released without manual work. , the time required for earth removal work when a vertical hole is being excavated by extending the kelly bar 11 can be shortened, and the efficiency of the excavation work can be greatly improved.

If the vertical hole is excavated by extending the Kelly bar 11, it is necessary to pull up the outer Kelly bar 12 after completing the drilling of the vertical hole, and then to retract the inner Kelly bar 13 into the outer Kelly bar 12 to reduce the Kelly bar 11. However, this Kelly bar 1
1, the lock of the inner Kelly bar 13 relative to the outer Kelly bar 12 can be released by rotating the Kelly bar 11 by a predetermined angle in the same manner as described above, so that the Kelly bar 11 can be easily reduced in this case.

Next, the case of excavating a vertical hole using a roller bit will be explained. In this case, with the outer kelly bar 12 pulled up, the chuck receptacle 14a at the lowest end is supported by the chuck pawl 25 as shown in FIG. In this state, after removing the excavation body mounting bracket 31 from the lower end of the inner kelly bar 13, the lock pin 44 provided on the kelly bar support 16 is moved back by energizing the solenoid, and in this state, the hanging rope 27 is wound up to attach the inner kelly bar. Raise 13. In this case, the inner Kelly bar 13
Even if the excavation body mounting bracket 31 is removed from the lower end of the inner kelly bar 13, the outer kelly bar 12 will not be pushed by the excavation body attachment bracket 31 and pulled up together with the inner kelly bar 13. At this time, only the inner Kelly bar 13 is pulled up. Then, when the inner kelly bar 13 is pulled up until its upper end touches the upper end of the kelly bar support 16, the dirt discharge port 41 opened on the upper end side of the inner kelly bar 13 is connected to the suction hose provided on the kelly bar support 16. The protrusions 15, 15, which match the tube 45 and are provided on the upper end side of the inner Kelly bar 13, slip out of the outer Kelly bar 12 and are housed in the cylindrical portion 16a of the Kelly bar support 16. After pulling up the inner Kelly bar 13 in this state, the Kelly bar support 16
The lock pin 44 provided in the inner kelly bar is caused to protrude by the spring force by cutting off the excitation of the solenoid, and this lock pin 44 is inserted into the lock hole 43 at the upper end of the inner kelly bar, and the inner kelly bar 13 is rotated together with the outer kelly bar 12 by this lock pin 44. Lock the Kelly bar support 16 to prevent it from happening. After this,
The lower cylinder 12a is removed from the outer Kelly bar 12, a roller bit connecting pipe 46 is attached to the lower end of the outer Kelly bar 12 as shown in FIG. 17, and a roller bit 47 is attached to the lower end of this connecting pipe 46.

After this, as shown in FIG. 18, connect the suction hose 48 (connected in advance before raising the mast 6) to the suction hose connection pipe 45 of the Kelly bar support 16 to the suction car 4.
9 or the like to excavate a vertical hole. At this time, the vertical hole can be excavated by rotating the outer kelly bar 12 and using the roller bit 47 in the same way as the excavation body 30 such as an auger or a drilling bucket described above. This is done by pushing down the outer Kelly bar 12 by raising and lowering the lifting unit 9 while rotating the roller bit, thereby embedding the roller bit 47 in the ground and propelling it. The suction hose 48 passes through the inside of the Kelly bar 13 and is connected to the suction hose connection pipe 45 of the Kelly bar support 16.
is discharged through.

Furthermore, when digging a vertical hole with this roller bit 47, it is not possible to lower the inner Kelly bar 13 and extend the Kelly bar 11, but even in this case, there is a pipe between the lower end of the outer Kelly bar 12 and the roller bit connecting pipe 46. If you add
It is possible to excavate a vertical hole with a depth exceeding the length of the outer Kelly bar 12.

In the above embodiment, a vertical hole excavator has been described which is capable of excavating a vertical hole using the roller bit 47. However, it is not necessary to be able to excavate a vertical hole using the roller bit 47. In that case, the outer kelly bar 12 and the inner The celery bar 13 may have a rectangular tube shape over its entire length.

Further, in the embodiment described above, the lock release mechanism for unlocking the inner Kelly bar 13 from the outer Kelly bar 12 is guided by the rotary lever 36 to which the lock pin 34 is pivotally attached and the lock release guide plate 39 as the Kelly bar 11 rotates. a lock release roller 40 that rotates the rotation lever 36 against a spring force;
For example, when the Kelly bar 11 rotates, this lock release mechanism rolls into contact with the outside of the lock release guide plate 39 and is guided by the guide plate 39 in a direction away from the outer Kelly bar 12. The lock pin 34 may be attached to a roller or the like (however, in this case, it is necessary to provide a gap between the lock release guide plate 39 and the inner peripheral surface of the cover 38 so that the roller can enter. Furthermore, the unlocking guide member provided on the lifting unit 9 side is not limited to the lock releasing guide plate 39 of the above embodiment.

Further, in the above embodiment, a vertical hole excavator in which the Kelly bar 11 is forcibly lowered by a cylinder has been described, but the present invention is directed to a vertical hole excavator in which the Kelly bar is lowered by the weight of the Kelly bar and the excavating body. Of course, it can also be applied.

〔Effect of the invention〕

In this invention, a lock release guide member is provided on the lower side of the Kelly bar rotating mechanism in correspondence with the height of the inner Kelly bar lock pin when the outer Kelly bar is pulled up, and a guide member is provided on the lower end side of the outer Kelly bar.
Since a lock release mechanism is provided in which the lock pin is guided by the lock release guide member and detached from the lock hole of the inner Kelly bar when the outer Kelly bar is rotated by a predetermined angle, the Kelly bar can be rotated while the outer Kelly bar is pulled up. By doing so, the lock pin can be removed from the lock hole of the inner kelly bar. Therefore, according to the present invention, when the inner Kelly bar is pulled up into the outer Kelly bar, the locking of the inner Kelly bar with respect to the outer Kelly bar can be automatically released without manual operation. The time required for earth removal work when excavating a vertical hole can be shortened, and the efficiency of excavation work can be greatly improved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an enlarged sectional view taken along line GG in FIG. 8, and FIG.
The figure also shows the unlocked state, Figure 3 is an overall view of the vertical hole excavator, Figure 4 is an enlarged sectional view taken along line A-A in Figure 3, and Figure 5 is taken along line B-B in Figure 3. 6 is an enlarged sectional view taken along the line C-C in FIG. 3, FIG. 7 is a sectional view of the Kelly bar and the Kelly bar support taken along the line D-D in FIG. 4, and FIG. 3
Figure 9 is an enlarged cross-sectional view taken along the line E-E in the figure, Figure 9 is a cross-sectional view taken along the line F-F in Figure 8, and Figures 10 to 16 are the vertical hole drilling process using an excavator such as an auger or a drilling bucket. Figure 17 is a sectional view of the Kelly bar and Kelly bar support along the line D-D in Figure 4 with the inner Kelly bar pulled up when drilling a vertical hole with a roller bit, and Figure 18 is a vertical hole drilling machine when drilling a vertical hole with a roller bit. This is an overall diagram. 6...Mast, 9...Elevating unit, 10...
Press down cylinder, 11...Kelly bar, 12...
...Outer Kelly Bar, 13...Inner Kelly Bar, 14,
14a...Chuck holder, 16...Kelly bar support, 20...Rotating body, 24...Hydraulic motor, 25
...Chuck claw for pushing down outer Kelly bar, 27...
... Hanging rope, 30 ... Excavation body, 33 ... Lock hole, 34 ... Inner kelly bar lock pin, 36 ...
Rotating lever, 39...Lock release guide plate, 40
...Roller for unlocking.

Claims (1)

[Claims] 1. A mast, a rectangular cylindrical outer Kelly bar that is provided along the mast so as to be movable up and down, a Kelly bar rotation mechanism that rotates the outer Kelly bar, and a Kelly bar rotation mechanism that rotates the outer Kelly bar and that is rotatable integrally with the outer Kelly bar. an inner kelly bar that is inserted into the kelly bar so as to be able to rise and fall, and whose upper end is suspended from a hanging rope and which is lowered below the outer kelly bar by letting out the rope; In a vertical hole drilling machine, the vertical hole drilling machine is equipped with a lock pin that is fitted into a lock hole provided at an upper end by a spring force and locks a lowered inner kelly bar, and an excavation body that is attached to a lower end of the inner kelly bar. An unlocking guide member is provided on the lower side corresponding to the height of the lock pin when the outer Kelly bar is pulled up, and a guide member for unlocking is provided on the outer side of the lower end of the outer Kelly bar when the outer Kelly bar is rotated by a predetermined angle. A vertical hole excavator comprising a lock release mechanism for removing the lock pin from the lock hole of the inner kelly bar by being guided by a lock release guide member.