JPS61250287A - Pit excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 underground at construction sites, civil engineering sites, etc., use excavators such as augers and drilling buckets.

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 rotation mechanism that rotates the outer Kelly bar. The inner kelly bar is inserted into the outer kelly bar so that it can rotate integrally with the outer kelly bar and can be raised and lowered relative to the outer kelly bar, and its upper end is suspended from a hanging port and is lowered below the outer kelly bar by letting out this rope. kelly bar
An excavating body such as an auger or a drilling bucket is attached to the lower end of the inner kelly bar.

This vertical hole excavator rotates a Kelly bar consisting of an outer Kelly bar and an inner Kelly bar while lowering the Kelly bar to propel the trench excavation into the ground. When the outer Kelly bar is rotated, the inner Kelly bar is rotated together with the outer Kelly bar, and the excavating body is rotated. In addition, 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 excavating body attached to the lower end of the inner Kelly bar is Before the 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 capable of digging 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 contracted. This inner kelly bar is used in cases where the hanging rope is wound up, the inner kelly bar and the outer kelly bar whose lower ends are supported by the excavation body at the lower end are pulled up, and the hanging rope is let out in this state. As a result, the inner kelly bar is lowered below the outer kelly bar (into the excavated hole) by its own weight. 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 spring force. The lowered inner Kelly bar is locked with respect to the outer Kelly bar by this locking bin.

After lowering the inner Kelly bar and extending the Kelly bar in this way, it is sufficient to lower the Kelly bar while rotating the outer Kelly bar in the same manner as described above.This allows the vertical hole to be dug roughly and deeply. I can go.

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 as appropriate during the excavation to bring the excavation body above the ground surface. When excavating with the Kelly bar extended, the inner Kelly bar and its lower end excavation body remain in the vertical hole even if the outer Kelly bar is pulled up.
This is done by pulling up the outer Kelly bar, then unlocking the inner Kelly bar from the outer Kelly bar and pulling the inner Kelly bar into the outer Kelly bar.

However, in the past, in order to unlock the inner kelly bar from the outer kelly bar, the lock pin had to be manually removed from the lock hole of the inner kelly bar, which was a very difficult and time-consuming process. Manually removing the lock pin each time the earth is removed often causes a problem in that the efficiency of the excavation work decreases due to the time required for the earth removal work.

[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, in this invention, on the lower side of the Kelly bar rotation mechanism,
A lock release guide member is provided corresponding to the height of the inner kelly par lock pin when the outer kelly bar is pulled up, and the outer kelly bar is rotated at a predetermined angle 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 allows the lock bin to be removed from the lock hole of the inner kelly bar when guided by the lock release guide member. By rotating the lock pin, the lock pin can be removed from the lock hole of the inner kelly bar, so that the inner kelly bar can be automatically unlocked from the outer kelly bar without manual operation.

[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 addition, in this example,
This shows a device in which a vertical hole is dug by forcibly pushing down a Kelly bar with a cylinder.

First, to explain the outline of a self-propelled vertical hole excavator, in Fig. 3, 1 is a running car body, 2 is a swivel table mounted on this car body 1, and a driver's cab 3 is on this swivel table 2. In addition, an engine 4, a winch 5, etc. are mounted thereon.

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 possible to

Reference numeral 9 denotes an elevating unit that is supported on the front side of the mast 6 so as to be movable up and down, and this elevating unit 9 is moved up and down by a predetermined stroke by a push-down cylinder 10 provided on the mast 6.

Reference numeral 11 denotes a Kelly bar provided on the front side of the mast 6 so that it can be raised and lowered along the mast 6.
11 is the outer Kelly bar 1 as shown in FIGS. 5 to 7.
2 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 has a cylindrical portion whose inner diameter is slightly smaller than the inscribed circle of the rectangular cylindrical portion. A cylindrical lower tube 12a having the same diameter as this cylindrical portion is connected to the lower end of this cylindrical portion with 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 surface of the rectangular tube portion of the outer Kelly bar 12 on both sides. .14, the lowest chuck holder is the 8th chuck holder.
As shown in the figure, the chuck receiver 14a has a rectangular shape with the upper and lower surfaces as chuck receiving surfaces, and all other chaff receivers 14, 14
is a tapered chuck holder whose upper surface is a chuck receiving surface, and the portion below this chuck receiving surface is a tapered surface that slopes downward and inward (towards the outer Kelly bar).

Further, 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,
On the outer periphery of the upper end of the inner Kelly bar 13, there are protrusions 15 at four locations that slide into contact with the inner surface of the rectangular tube portion of the outer Kelly bar 12.
, 15 protrude along the axial direction of the inner Kelly bar. And, the inner Kelly bar 13 is the outer Kelly bar 12.
It is inserted into the inner part so that it can be raised and lowered.
13 is adapted to rotate together with the outer Kelly bar 12 via protrusions 15, 15 on its upper end side. Furthermore, on the inner circumference of the lower end of the lower cylinder 12a of the outer Kelly bar 12, a
As shown in the drawings and FIG. 8, a seal ring a is provided to seal the sliding gap of the inner kelly bar 13.

Further, in FIG. 3, reference numeral 16 denotes a Kelly bar support that supports the upper end of the outer Kelly bar 12, and this Kelly bar support 16 is attached to a support member 17 provided on the mast 6 so as to be movable up and down.

The support member 17 is made to be expandable and retractable with a built-in buffer spring, and is designed to absorb shocks caused by the movement of the upper end of the Kelly bar.

As shown in FIGS. 4 and 7, the Kelly bar support 16 has an inner diameter larger than the inscribed circle of the rectangular cylindrical portion of the outer Kelly bar 12 and has protrusions 15, 1 of the inner Kelly bar 13 on the lower end side.
A cylindrical portion 16a having a length slightly larger than the length of 5 is formed, and the upper end portion of the outer Kelly bar 12 is connected to the cylindrical portion 16a.
It is rotatably supported at the lower end of 6a via a bearing 18. Further, at the upper end of the Kelly bar support 16, an introduction hole 19 for an inner Kelly bar suspension row 127, which will be described later, is provided.

Further, as shown in FIG.
is inserted into this rotating body 20 so as to be able to move up and down.
It is designed to be rotated by a rotation of 0.

The rotating body 20, as shown in FIGS. 8 and 9,
An outer Kelly bar holding cylinder 22 having a square through hole 22a into which the outer Kelly bar 12 is slidably fitted in its length direction is fixed to the center of the gear wheel 21. In addition, the upper and lower ends of the Kelly bar holding cylinder 22 are supported by the casing 9a of the lifting unit 9 via bearings 23. It is designed to be rotated by rotationally driving the shaft 21.

The outer Kelly bar 12 is inserted into the through hole 22a of the outer Kelly bar holding cylinder 22, and is held in 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. , is rotated by the rotation of the rotating body 20. The through hole 22a of the outer Kelly bar holding cylinder 22 has holes on both sides thereof.
Chuck receiver 14.14 and 14a of outer Kelly bar 12
It has a shape in which escape parts 22b, 22b are provided.

In FIG. 8, reference numerals 25 and 25 denote a pair of left and right chuck claws for pushing down the outer Kelly bar, which are provided at the upper end of the outer Kelly bar holding cylinder 22 of the rotating body 20 so as to be movable toward and away from the outer Kelly bar 12. , this chuck jaw 25.2
5 is brought into contact with the outer surface of the outer Kelly bar 12 by a spring force, and is separated from the outer Kelly bar 12 by a solenoid 26. This chuck claw 25.25 for pushing down the outer Kelly bar comes 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 pushing cylinder 10, and the outer Kelly bar 12 is pushed down. It pushes down only the downward stroke of the lifting unit 9, and the outer Kelly bar 1
2, in a state before starting excavation of a vertical hole, as shown in FIG.
This chuck jaw 25 is received from below at an angle of 5°25.
．． It is supported by 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 a winch 5 mounted on a swivel base 2 on the traveling vehicle body 1, and this hanging loaf 2
7 is guided by a guide sheave 28° 28 and 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 the inner Kelly bar 13. I support it lower.

The inner kelly bar 13 is in a state drawn into the outer kelly bar 12 before the start of vertical hole excavation and when the vertical hole is being excavated with the kelly bar 11 contracted;
When the Kelly bar 11 is extended to excavate a vertical hole, it is lowered below the outer Kelly bar 12 by letting out the hanging rope 27. For mounting the excavating body 30 such as an auger or a drilling bucket, use the bracket 3.
1 are removably fitted and fixed by pins 32. Note that FIG. 3 shows a state in which an auger is set as the excavating body 30.

The excavation body 30 is attached to the bracket 31 when a vertical hole is being excavated with the Kelly bar 11 reduced.
As shown in FIG. 7, the upper end is pushed by the lower cylinder 12a of the outer Kelly bar 12 and pushed into the ground, and the Kelly bar 1
When extending 1 and drilling a vertical hole, use the inner kelly bar 1.
3 is pushed into the ground and propelled, and when extending the Kelly bar 11 and excavating a vertical hole, the outer Kelly bar
The inner Kelly bar 13 that has been lowered below the Kelly bar 12 is locked to the outer Kelly bar 12 in the following manner, and the outer Kelly bar 13 is locked to the outer Kelly bar 12 as follows.
2, the outer Kelly bar 12 is pushed down together with the outer Kelly bar 12.

That is, the inner kelly bar 13 has lock holes 33° 33 formed on both sides of its upper end by cutting out the protrusions 15 and 15 provided on the outer surface of the inner kelly bar, for example, as shown in FIGS. 1 and 7. There is also an outside Kelly bar.
As shown in FIGS. 1 and 8, 12 is provided with a pair of inner kelly parlock pins 34, 34 located on both sides of the upper end of the rectangular tube portion. This lock pin 34
．． 34 are each pivotally supported by one end of a rotating lever 36 whose intermediate portion is pivotally supported by a bracket 35 protruding from the outer surface of the outer Kelly bar 12, and by rotation of this rotating lever 36, the outer Kelly bar 12 is rotated. The rotary lever 36 is provided so as to be moved in and out of the outer Kelly bar 12 through an opening provided therein, and the pivot lever 36 is rotated by a coil spring 37 interposed between the other end side and the outer Kelly bar 12 to lock the lock pin. 34 is given a rotational force in the direction of protruding into the outer Kelly bar 12. In other words, the lock pin 34 is connected to the coil spring 3.
The inner Kelly bar 13 is always in contact with the outer surface of the inner Kelly bar 13 due to the spring force of the spring 7, and the inner Kelly bar 13
The lock hole 33 of the inner Kelly bar 13 is lowered downward.
When the lock pin 34 comes to a position facing the lock pin 34, the lock pin 34 is inserted into the lock hole 33 by the spring force, and the inner Kelly bar 1 is inserted into the lock hole 33.
3 is locked.

Further, in FIGS. 1 and 8, 38 is a cylindrical cover provided at the bottom of the lifting unit 9, and the lower end of this cover 38 is provided with the outer Kelly bar 12 and the aforementioned circuits provided on both sides thereof. An end plate 38a is provided which defines an opening 38b through which a moving lever 36.36 can pass.

On both sides of the cover 38, arcuate lock release guide plates 39, 39 are curved along the circumferential direction of the cover 38 from the starting end to the terminal end and away from the outer Kelly bar 12. is fixed to the cover 38, and this lock release guide plate 39.39 is used to pull up the outer Kelly bar 12 and release the chuck receiver 14a at the lowermost end.
When the lock pin 34 is received by the chuck claw 25 for pushing down the outer Kelly bar as shown in FIG.
．． It is provided corresponding to the height of 34.

Also, the rotary lever 3 that pivotally supports the lock pin 34
A lock release roller 40 that contacts the lock release guide plate 39 is attached to the other end of the lock release roller 6 . The lock release roller 40 rides on the lock release guide plate 39 by rotating the outer Kelly bar 12 in the direction of the arrow shown in FIG. The rotating lever 3 is pushed by the plate 39
6 is rotated against the spring force of a coil spring 37 in a direction to remove the lock pin 34 from inside the outer Kelly bar 12, and the lock pin 34 is moved from the inner Kelly bar by this lock release roller 40 and the rotating lever 36. -13 lock hole 33
A lock release mechanism is configured to release the lock.

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 the lock release roller 40 has been moved from the state shown in FIG. 1 to the outer kelly bar 12. When the lock pin 3 is rotated by a predetermined angle until it reaches the starting end side of the guide plate 39 as shown in FIG.
4 is removed from the lock hole 33 of the inner kelly bar 13, and the inner kelly bar 13 is unlocked.

Further, this vertical hole drilling machine is capable of excavating vertical holes not only with the excavating body 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 from inside the inner Kelly bar 13 to the soil discharge port 41. A weir plate 42 that guides the water is provided diagonally. In addition, when the Kelly bar 13 is used for vertical hole drilling with a roller bit, the convex ridges 15.
Kelly bar support 1
A lock pin 44 is provided on the side surface of the upper end of the inner kelly bar 6 to lock the inner kelly bar 13 that has been pulled up by fitting into a lock hole 43 provided on the side surface of the upper end of the inner kelly bar 13. 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. 13 is pulled up, the excitation of the solenoid is cut off, and the lock hole 43 of the inner Kelly bar 13 is pushed out again by the spring force.
The solenoid is fitted into the driver's cab 3, and the excitation and excitation-cutting operations of the solenoid are performed in the operator's cab 3. Further, at the upper end of the Kelly bar support 16, a bent tubular suction hose connection pipe 45 extending laterally is provided.
is provided, and the dirt discharge port 41 of the inner Kelly bar 13 that has been pulled up matches the opening of the suction hose connection pipe 45 into the Kelly bar support 16.

10 to 16 show the process of digging and drilling 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, with the lowermost chuck receiver 14a of the outer Kelly bar 12 supported on the chuck claw 25 for pushing down the outer Kelly bar, the inner Kelly bar 13 is moved by letting out the hanging row 127.
is lowered, and an excavating body 30 such as an auger or a drilling bucket is attached to the lower end of the Kelly bar 13 via a bracket 31. After this, winch 5
The hanging loaf 27 is hoisted up 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 bracket 31 to attach the excavation body to the lower end of the inner Kelly bar 13.

After completing the above excavation preparations, the solenoid 26 that retracts the chuck claw 25 for pushing down the outer kelly bar is energized by remote control from the operator's cab 3, and the chuck claw 25 is released from the lowermost chuck claw 14a. Then let out the hanging row 127 from the winch 5 at low speed and remove the Kelly bar.
11 is lowered until the excavation body 30 reaches the ground surface.

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. In this case, 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. Further, the chuck claw 25 is activated by a spring force by cutting off the excitation of the solenoid 26 after lowering the Kelly bar 11 until the lowermost chuck claw 14a of the outer Kelly bar 12 is below the chuck claw 25. 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 rotary body 20 in the lifting unit 9 is rotated by the hydraulic motor 24 to lower the outer Kelly bar 11.
Rotate the inner Kelly bar 13 together with this Kelly bar.
11 rotates the excavating body 30, and at the same time extends the push-down cylinder 10 and lowers the elevating unit 9. When the elevating unit 9 is lowered in this way, the rotating body 20 descends together with the elevating unit 9.
The chuck claw 25 provided on the outer Kelly bar 1
The outer Kelly bar 12 comes into contact with the chuck receiver 14a at the lowermost end of 2 from above and pushes down the outer Kelly bar 12. After this, while letting out the hanging row 127 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 outer Kelly bar 12 lower tube 1
2a, the bracket 31 is pushed down to attach the excavation body, and the inner kelly bar 13 is lowered together with the outer kelly bar 12 via the bracket 31, so that the entire kelly bar 11 is attached to the kelly bar support 16 and the excavation body. 3
0, and the excavating body 30 is pushed into the ground while digging a vertical hole 50 as shown in FIG. 10.

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 moved to the next chuck receiver at the lowest end of the outer Kelly bar 12. 1
Move it above 4.

In this case, since the chuck holders 14 and 14 except for the chuck holder 14a at the bottom end are tapered chuck holders, the chuck claws 25 can be moved into the chuck even if the chuck claws 25 are not retracted by excitation of the solenoid 26. The chuck receiver 1 is pushed back against the spring force by the tapered surface of the receiver 14.
Overcome 4.

In this way, the chuck claw 25 for pushing down the outer Kelly bar
After moving the outer kelly bar 12 onto the next chuck holder 14 at the lowest end of the outer kelly bar 12, by extending the push cylinder 10 while letting out the hanging lobe 27 again, the outer kelly bar 12 is attached to the chuck jaw in the same manner as above. 25 to propel the excavation body 30 underground, and by repeating this operation, the excavation body 30 is propelled underground by strokes corresponding to the extension stroke of the pushing cylinder 10, and the vertical hole 50 is driven. You can dig and go.

FIG. 11 shows a state in which the vertical hole 50 has been excavated to the maximum depth that can be excavated with the Kelly bar 11 contracted (with the inner Kelly bar 13 retracted into the outer Kelly bar 12).

Further, the earth and sand excavated by the excavation body 30 can be removed by pulling up the Kelly bar 11 as needed during excavation to bring the excavation body 30 above the ground surface, or by excavating with the Kelly bar 11 contracted. To discharge the excavated earth and sand when the outer Kelly bar 12 is removed, the chuck claw 25 is retracted by excitation of the solenoid 26, and the hanging loaf 27 is hoisted up and the Kelly bar 11 is pulled up as shown in FIG. This is done with the chuck receiver 14a supported by the chuck claws 25. In this case, the Kelly bar 11 is pulled up by stopping the rotation of the Kelly bar 11. At this time, the lock release mechanism provided at the lower end of the square tube of the outer Kelly bar 12 is moved to the position shown in FIG. If not, the lock release mechanism will hit the end plate 38a of the cover 38 and the Kelly bar 11 will not be able to be pulled up any further.
a until it is in a position facing the opening 38b of the cover (the position shown in FIG.
After passing through the opening 38b and entering the cover 38, the Kelly bar 11 is pulled up.

In addition, when excavating a vertical hole 50 that is roughly deeper than the maximum depth that can be excavated with the Kelly bar 11 reduced, the vertical hole 50 can be drilled to the maximum depth with the Kelly bar 11 reduced.
After excavating, Kelly bar is removed in the same manner as the earth removal process above.
11 and support the lowermost chuck receiver 14a of the outer Kelly bar 12 with the chuck claws 25, then lift the hanging row 1.
27, as shown in Figure 13, the inner Kelly bar 13
is lowered into the vertical hole 50. And, inner Kelly bar-13
When the ridges 15, 15 on the upper end side of the outer Kelly bar 12 are lowered until they touch the lower end of the rectangular tube of the outer Kelly bar 12, the lock hole 33 provided on the upper end side of the inner Kelly bar 13 locks into the outer Kelly bar 1.
At this time, the lock pin 34 is fitted into the lock hole 33 of the inner kelly bar 13 by the spring force of the coil spring 37, and the inner kelly bar is closed. -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. , push cylinder 10
The vertical hole 50 may be excavated by pushing down the outer kelly bar 12 with the chuck claw 25 by strokes corresponding to the extension stroke of , thereby propelling the excavating body 30 into the ground. FIG. 14 shows a state in which the vertical hole 50 has been excavated to the maximum depth with the Kelly bar 11 extended.

Also, 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 the excavation to place the excavation body 30 above the ground surface. This Kelly bar 1 will be released and carried out.
When excavating with the outer Kelly bar 12 extended, even if the outer Kelly bar 12 is pulled up, the inner Kelly bar 13 and the excavation body 3 at its lower end will be damaged.
0 is in the vertical hole 50, in this case, pull up the Kelly bar 11 and remove the outer Kelly bar 12 as shown in FIG.
After the lowermost chuck receiver 14a is supported by the chuck claws 25, the inner kelly bar 13 is moved against the outer kelly bar 12.
16, release the lock of the hanging robe 27, and as shown in FIG.
I'll bring it up within 2.

The locking of the inner Kelly bar 13 with respect to the outer Kelly bar 12 is performed as follows.

First, when the Kelly bar 11 is pulled up and the lowermost chuck receiver 14a of the outer Kelly bar 12 is supported by the chuck claw 25 as shown in FIG. As shown in FIGS. 1 and 8, the lock release rollers 40, 40 of the lock release mechanism inserted into the cover 38 have three lock release guide plates.

It will be located at the same height as 39. In this state, when the Kelly bar 11 is rotated by a predetermined angle in the direction of the arrow shown in FIG. Climb onto the starting end of this guide plate 3.
9. Pushed inward (outer Kelly bar 12 side) by 39,
As a result, the pivot lever 36.36 is pivoted against the spring force of the coil spring 37, and the lock pin 34.34, which is pivotally supported by the pivot lever 36.36, is moved inwards as shown in FIG. It is pulled out from the lock holes 33 and 33 of the Kelly bar 13.

The lock pin 34.34 pulled out from the lock hole 33.33 of the inner kelly bar 13 is inserted into the lock release roller 40° by rotating the kelly bar 11 to the state shown in FIG. 1 after pulling up the inner kelly bar 13. 40 from the lock release guide plate 39.39, the lock hole 33 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 33 of the inner kelly bar 13 is lowered again after soil removal. Insert into .33.

However, in this vertical hole drilling machine, as mentioned above,
The elevating unit 9 is provided with a lock release guide plate 39.39 corresponding to the height of the inner Kelly par lock pin 34, 34 when the outer Kelly bar 12 is pulled up. When the outer Kelly bar 12 is rotated by a predetermined angle, the lock pin 34 is guided by the lock release guide plate 39.39.
Since a lock release mechanism is provided for separating the inner Kelly bar 13 from the lock hole 33, 33, the outer Kelly bar 12
By rotating the Kelly bar 11 with the inner Kelly bar 11 pulled up, the lock pin 34° 34 can be removed from the lock hole 33, 33 of the inner Kelly bar 12. Therefore, according to this vertical hole excavator, when the inner Kelly bar 13 is pulled up into the outer Kelly bar 12, the lock of the inner Kelly bar 13 relative to the outer Kelly bar 12 can be automatically unlocked without manual work. As a result, the time required for draining and lifting work when extending the Kelly bar 11 and digging a vertical hole can be shortened, and the efficiency of the digging work can be greatly improved.

In addition, when extending the Kelly bar 11 and digging a vertical hole, after completing the drilling of the vertical hole, pull up the outer Kelly bar 12,
After this, it is necessary to retract the inner Kelly bar 13 into the outer Kelly bar 12 to shrink the Kelly bar 11.
Since the locking of the inner Kelly bar 13 for 2 can be performed by rotating the Kelly bar 11 by a predetermined angle in the same manner as described above, the Kelly bar 11 in this case can also be easily reduced.

Next, we will explain the case of drilling a vertical hole using a roller bit. In this case, with the outer kelly bar 12 pulled up, the chuck receiver 14a at the lowest end is attached to the chuck claw 25 as shown in FIG. In this state, attach the excavated body from the lower end of the inner Kelly bar 13 to the bracket 31.
After removing the Kelly bar support 16, the lock pin 44 provided on the Kelly bar support 16 is moved back by energizing the solenoid, and in this state, the hanging loaf 27 is rolled up and the inner Kelly bar 13 is pulled up. In this case, even if you pull up the inner Kelly bar 13,
When mounting the excavation body, since the bracket 31 is removed from the lower end of the inner Kelly bar 13, the outer Kelly bar 12 is not pushed by the bracket 31 and pulled up together with the inner Kelly bar 13, and therefore this At this time, only the inner Kelly bar 13 is being 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 Kelly bar support 16 is provided with a dirt discharge port 41 which is opened on the side surface of the upper end of the inner Kelly bar 13. A protrusion 15 that matches the suction hose connection pipe 45 and is provided on the upper end side of the inner Kelly bar 13,
15 is removed from the outer Kelly bar 12 and stored in the cylindrical portion 16a of the Kelly bar support 16. After the inner Kelly bar 13 is pulled up to this state, the lock pin 44 provided on the Kelly bar support 16 is caused to protrude by the spring force by cutting off the excitation of the solenoid, and the lock pin 44 is inserted into the lock hole 44 at the upper end of the inner Kelly bar. Insert this lock pin 4 into
4 locks the inner Kelly bar 13 to the Kelly bar support 16 so that it does not rotate together with the outer Kelly bar 12. After this, the lower cylinder 12a is removed from the outer Kelly bar 12, and 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.
The vertical hole can be divided by connecting the suction hose 48 (connected in advance before the mast 6 is erected) to the suction hose connecting pipe 45 to the suction wheel 49, etc. Similarly to the trench cutting using the excavating body 30 such as an auger or a drilling bucket, the outer Kelly bar 12 is rotated and the roller bit 47 is rotated, and the lifting unit 9 is raised and lowered to push down the outer Kelly bar 12 and the roller bit 47 is removed. The earth and sand excavated by the roller bit 47 pass through the roller bit connecting pipe 46 and the inner Kelly bar 13, and are suctioned from the suction hose connecting pipe 45 of the Kelly bar support 16. It is discharged via hose 48.

Further, when excavating 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, the outer Kelly bar 12
If a pipe is added between the lower end of the outer kelly bar 12 and the roller bit connecting pipe 46, a vertical hole with a depth exceeding the length of the outer Kelly bar 12 will be dug. be able to.

In the above embodiment, a vertical hole excavator has been described in which the roller bit 47 can also be used to cut a vertical hole, but the roller bit 47 may not be able to use the roller bit 47 to cut a vertical hole. Alternatively, the inner kelly bar 13 may have a rectangular cylindrical shape over its entire length.

Further, in the above embodiment, the lock release mechanism for unlocking the inner Kelly bar 13 from the outer Kelly bar 12 is connected to the lock pin 34 and the rotating lever 36 and the Kelly bar.
11, the lock release roller 40 is guided by a lock release guide plate 39 and rotates the rotary lever 36 against a spring force. 11, the guide plate 39 rolls into contact with the outside of the lock release guide plate 39.
The lock pin 34 may be attached to a roller or the like that is guided in a direction away from the outer Kelly bar 12 by the lock pin 34 (however, in this case, the lock release guide plate 39 and the cover 3
(It is necessary to provide a gap for the roller to enter between the inner circumferential surface of It is not limited to 39.

Further, in the above embodiment, a vertical hole drilling machine in which the Kelly bar 11 is forcibly lowered by a cylinder has been described, but this invention is applicable to a vertical hole drilling machine 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 rotation mechanism in correspondence with the height of the inner Kelly bar lock pin when the outer Kelly bar is pulled up, and an outer Kelly bar 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 released from the lock hole of the inner Kelly bar when the inner Kelly bar is rotated by a predetermined angle, the Kelly bar can be removed with the outer Kelly bar pulled up. By rotating the lock pin, 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 lock of the inner Kelly bar can be automatically unlocked from the outer Kelly bar without manual operation. It is possible to shorten the time required for earth removal work when extending a vertical hole and digging a vertical hole, and greatly improve excavation work efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an enlarged sectional view taken along the line GG in FIG. 8, FIG. 2 is a diagram showing the unlocked state, and FIG. Overall view, Figure 4 is an enlarged cross-sectional view taken along line A-A in Figure 3, Figure 5 is an enlarged cross-sectional view taken along line B-B in Figure 3, and Figure 6 is C-D in Figure 3. 7 is a cross-sectional view of the Kelly bar and Kelly bar support along line D-D in FIG. 4, and FIG.
An enlarged sectional view taken along line E-E in the figure, 'Figure 9 is F of Figure 8.
10 to 16 are diagrams of the vertical hole drilling process using an excavating body such as an auger or a drilling bucket, and FIG. 17 is a sectional view taken along line E. FIG. 18 is a sectional view of the Kelly bar and the Kelly bar support taken along the line D--D in the drawing, and is an overall view of the vertical hole drilling machine when drilling a vertical hole with a roller bit. 6... Mast, 9... Lifting unit, 10... Push down cylinder, 11... Kelly bar 112... Outer Kelly bar 113... Inner Kelly bar 114, 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, 3
o... Excavation body, 33... Lock hole, 34... Inner kelly par lock pin, 36... Rotating lever, 39...
-Lock release guide plate, 40...Lock release roller. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 4 Figure 5 b Figure 6

Claims (1)

[Claims] a mast; a rectangular cylindrical outer kelly bar provided along the mast so as to be movable up and down; a kelly bar rotation mechanism for rotating the outer kelly bar; an inner kelly bar that is inserted into the outer 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 excavator is equipped with a lock pin that locks a lowered inner kelly bar by being fitted into a lock hole provided at the upper end by a spring force, and an excavating body that is attached to the lower end of the inner kelly bar. A lock release guide member is provided on the outside of the lower end side of the outer Kelly bar in correspondence with the height of the lock pin when the outer Kelly bar is pulled up. A vertical hole excavator comprising a lock release mechanism that allows the lock pin to be removed from the lock hole of the inner kelly bar by being guided by a lock release guide member.