JP2645976B2 - Excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator used for constructing concrete piles, H-shaped piles, steel pipe piles, and the like.

[0002]

2. Description of the Related Art Generally, an earth auger machine using an auger screw is used for drilling a hole in a concrete pile, an H-shaped pile, and a steel pipe pile.

As shown in FIG. 6, a crawler type heavy machine 1 is provided with a long leader mast 2 so as to be able to move up and down, and a leader 2a of the leader mast 2 is engaged with a driving device 3 comprising a motor and a speed reducer. The driving device 3 is suspended from the top sheave 2b of the leader mast 2 so as to be able to move up and down.

[0004] A driving device 3 is connected to the upper end of the auger screw 4 and drives it to rotate.

[0005]

In the earth auger machine, the center of gravity is high when the length of the leader mast 2 is long and the drive unit 3 is located above the leader mast 2 due to the addition of the auger screw 4 or the like. It becomes a very unstable state, and there is a high risk of the heavy equipment 1 falling.

A heavy equipment 1 having a long leader mast 2
However, there is a problem that the reader mast 2 cannot be used in a place where there is no space above because the leader mast 2 becomes an obstacle.

Further, in the auger screw 4, when earth and sand are clogged between the screw blades in a compacted state, excavation resistance increases,
In some cases, it becomes impossible to excavate. This tendency is remarkable as the excavation depth increases and the length of the auger screw 4 increases.

[0008] An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and even when using a drilling shaft of a rotary type such as an auger shaft, a leader mast can be made short and a compact heavy machine as a whole. Another object of the present invention is to provide an excavator that can maintain a stable state at all times, has high safety, and has excellent excavation performance.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a crawler-type heavy machine in which a short leader mast is provided so as to be able to move up and down, and a cylindrical rotary shaft is provided in a drive device having left and right cylinder lifting legs. Is raised so that the lower part is slightly downward, and penetrates up and down, this driving device is engaged with the leader of the leader mast so as to be able to move up and down, and the gripping drum formed on the excavation shaft such as an auger shaft is used. The inner periphery of the cylindrical rotary shaft can be locked, and a chuck device that can be tightened is disposed between the lower ends of the lifting legs by the cylinder. Further, the excavating shaft is separated from the shaft peripheral surface, and The gist of the present invention is to provide a consolidation wing curved in a direction.

[0010]

According to the first aspect of the present invention, an excavating shaft such as an auger shaft is driven to rotate by the cylindrical rotating shaft by locking a gripping drum formed on the excavating shaft on the inner periphery of the cylindrical rotating shaft. ,
Excavate the ground. And since the excavation shaft is locked near the upper end of the cylindrical rotary shaft and locked near the lower end, the insertion length into the ground can be adjusted by the length of the cylindrical rotary shaft, and The excavation shaft can be sent to the ground in the form of a worm, and can be lifted with the drive device that moves up and down the short leader mast, as the cylindrical rotary shaft reciprocates up and down.

When the excavation operation is completed and the driving device is removed from the leader mast, the crawler type heavy machine becomes only the short leader mast 7. By tilting the leader mast, the heavy equipment can be moved out of the way.

In order to continue work, such as performing continuous drilling, the drive device is positioned below the short leader mast when moving while the drive device is being worn, and the cylindrical rotary shaft is moved to the leader mast. If they are arranged side by side, the center of gravity can be lowered to allow stable movement.

According to the second aspect of the present invention, in addition to the above-described operation, the chuck device performs centering for excavation of the excavation shaft and excavation existing in the hole when performing addition or the like of the excavation shaft. Hold the upper end of the shaft.

According to the third aspect of the present invention, the excavation shaft is used to cut cobble stones and the like in the ground containing a boulder and a boulder by the excavation head at the tip thereof, and to cut and drill the cobble stones in the rock mass.
The excavated earth or the kneaded material of the excavated earth and the stabilizing liquid such as bentonite liquid is applied to the hole wall by the consolidation blade to perform hole wall consolidation.

The void ratio is about 60-70% in the loam layer, about 35-45% in the sand layer, and about 25-35% in the gravel layer. However, the void ratio changes due to the pore wall consolidation, so-called loosening of the ground. The excavating efficiency can be increased by reducing the tightening action of the drill. In addition, since the excavated earth and sand is used for such hole wall consolidation, the excavated earth and sand is not discharged at all on the ground, or the amount of discharge is small.

Further, when a concrete pile, an H-shaped steel, a steel pipe, or the like is built in an excavated hole of a consolidated hole wall, the peripheral surface of the concrete pile, the H-shaped steel, the steel pipe, or the like is loosened while the hole wall is loosened. As a result, a stable pile can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing one embodiment of an excavator according to the present invention, FIG. 2 is a front view of a main part of the excavator, FIG. 3 is a plan view of the excavator, and 5 is a crawler type heavy equipment having a crawler belt 5a as a traveling means. An outrigger 6 is provided before and after that.

A short leader mast 7 is rotatably supported on the heavy equipment 5 by rotatably supporting a lower end thereof by means of a diagonally hung cylinder 8 having its lower end pivotally mounted and its upper end pivotally mounted at both ends. The lower end of the leader mast 7 is attached to a support rod 9.
, But can be moved back and forth by the slide jack 10. In the figure, reference numeral 7a denotes a leader of the leader mast 7.

In the figure, reference numeral 11 denotes a drive device in which a motor 12 is started, and a reduction gear to which the motor 12 is connected is provided therein. Stand up a little below and penetrate up and down.

Further, a lifting leg 14 by a cylinder is provided on the left and right sides of the driving device 11 so as to be erected from the ground.
Further, a curved arm-shaped engaging hardware 15 is provided at the back, and the engaging hardware 15 is engaged with the leader 7a of the short leader mast 7 so as to be able to move up and down.

FIG. 4 shows an excavating shaft 16 used in the present invention. As a modification of the auger shaft which is a screw shaft, intermittent screw blades are provided as stirring blades 17 around the shaft, and further separated from the shaft peripheral surface. In addition, a consolidation wing 18 that is curved along the circumferential direction is provided. A plurality of excavating shafts 16 can be added, and an excavating head (not shown) is connected to the tip.

A gripping drum 19 is attached to an upper end portion of the excavating shaft 16, and the cylindrical rotary shaft 13 is
And the excavating shaft 16 projecting downward was lockable. A swivel 22 for injecting a solidified liquid such as cement milk is provided at the upper end of the excavating shaft 16 that emerges above the gripping drum 19.

In the illustrated example, the cylindrical rotating shaft 13 is held by the gripping drum 19 on the inner periphery of the cylindrical rotating shaft 13.
A lock device 21 with a pin protruding inward by a cylinder or the like is provided at appropriate intervals vertically. In addition, as the locking method, other methods such as bolting and providing a pressing rod or a pressing piece on the gripping drum 19 side can be considered.

In the figure, reference numeral 20 denotes a chuck device for the excavating shaft 16, which is a center hole type having a ground plate 20a projecting therearound, and a pressing plate 20c for narrowing the hole diameter by a cylinder 20b is arranged around the hole. . The chuck device 20 is provided between the lower ends of the lifting legs 14 by the cylinder.
At 14, the ground plate 20 a is arranged so as to be stepped on.

Next, usage and operation will be described. The drilling shaft 16 is inserted from the upper opening of the cylindrical rotary shaft 13,
The gripping drum 19 is locked on the inner circumference of the cylindrical rotary shaft 13 by the lock device 21. The drive unit 11 is positioned above the short leader mast 7 by extending the lifting leg 14.

When the motor 12 is driven, the cylindrical rotary shaft 13 is rotated via the speed reducer, and the excavating shaft 16 is accordingly driven to rotate to excavate the ground.

The excavating shaft 16 is a cobblestone with the excavating head at the tip thereof.
Cobbled stones and the like are cut on rock-mixed ground, and drilled and drilled on rock, and the mixing of excavated soil or excavated soil and stable liquid such as bentonite liquid based on such drilling is performed by a stirring blade 17. The kneaded material is applied to the hole wall by the consolidation wing 18.

The excavation with the excavation shaft 16 may be performed while pouring a solidified material such as cement milk. In addition, the chuck device 20 acts as a steady rest during excavation of the excavation shaft 16 and performs centering.

The cylindrical rotary shaft 13 descends with the lowering of the driving device 11 when the lifting leg 14 is set free. The gripping drum 19 is assumed to be locked near the upper end of the cylindrical rotary shaft 13. When the cylindrical rotary shaft 13 comes to the lowered position, the locking to the gripping drum 19 is released, the elevating leg 14 is extended, and the driving device 11 is moved up again. The drum 19 is locked again. This allows the excavation shaft 16 to be further inserted into the ground.

As the cylindrical rotary shaft 13 reciprocates up and down by the driving device 11 for raising and lowering the short leader mast 7, the excavating shaft 16 is fed into the ground while appropriately adding the excavating shaft 16 in the form of a worm. I do.

The same applies to the case of pulling up. In order to appropriately separate the drilling shaft 16 that has been added, the chucking device 20 holds the drilling shaft 16 remaining in the hole and removes the upper part thereof.

Although not shown, a casing can be set in the cylindrical rotating shaft 13 as another usage, and the ground can be excavated in a core shape with the casing.

Further, as shown in FIG. 5, the pile can be hit by disposing the monken 23 inside the cylindrical rotary shaft 13. In the figure, reference numeral 24 denotes a driving device of the monken 23 using a cylinder 25 as a driving source, which is coupled to an upper portion of the cylindrical rotary shaft 13.

When the excavation operation is completed and the drive unit 11 is removed from the leader mast 7, the crawler type heavy equipment 5 is only the short leader mast 7. Then, as shown in FIG. 1, the leader mast 7 tilts the
The heavy equipment 5 can be moved out of the way.

In order to continue the work, such as performing continuous drilling, the driving device 11 is positioned below the short leader mast 7 when moving while the driving device 11 is being worn. If they are arranged in line with the leader mast 7, the center of gravity can be lowered and the vehicle can be moved stably.

[0036]

As described above, the excavator according to the present invention requires only a short leader mast even when using a drilling type excavating shaft such as an auger shaft which is rotationally driven, and is compact as a whole. It is what becomes.

Further, the center of gravity does not become high, and a stable state can be always maintained, so that the safety is high.

Further, in the present invention according to the third aspect, excavation performance is improved by performing hole wall consolidation.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of an excavator according to the present invention.

FIG. 2 is a front view of a main part showing one embodiment of the excavator of the present invention.

FIG. 3 is a plan view showing an embodiment of the excavator according to the present invention.

FIG. 4 is a front view of a drilling shaft used in the excavator of the present invention.

FIG. 5 is a side view showing another example of use of the excavator of the present invention.

FIG. 6 is a side view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heavy machine 2 ... Leader mast 2a ... Leader 2b ... Top sheave 3 ... Drive device 4 ... Auger screw 5 ... Heavy machine 5a ... Crawler belt 6 ... Outrigger 7 ... Leader mast 7a ... Leader 8 ... Cylinder 9 ... Support rod 10 ... Slide jack 11 ... Drive device 12 ... Motor 13 ... Cylindrical rotary shaft 14 ... Elevating leg 15 ... Engagement hardware 16 ... Drilling shaft 17 ... Stirring blade 18 ... Consolidation blade 19 ... Gripping drum 20 ... Chuck device 20a ... Ground plate 20b ... Cylinder 20c ... Pressing plate 21… Lock device 22… Swivel 23… Monken 24… Drive device 25… Cylinder

Claims (3)

(57) [Claims] 1. A crawler type heavy machine is provided with a short leader mast so as to be able to move up and down, and a cylindrical rotary shaft is penetrated up and down so that a lower part of the drive unit is provided with left and right elevating legs. The driving device is vertically engaged with the leader of the leader mast so that a gripping drum formed on an excavation shaft such as an auger shaft can be locked on the inner periphery of the cylindrical rotary shaft. Excavator featuring. 2. The excavator according to claim 1, wherein a tightenable chuck device is provided between the lower ends of the lifting legs by the cylinder. 3. The excavator according to claim 1, wherein the excavating shaft includes a consolidation wing that is separated from the shaft peripheral surface and curved along the circumferential direction.