JPH11217985A - Earth drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leader type earth drill with the advantages of showing guide operation of a kelly-bar independently of its elongation, showing guide operation of the kelly-bar even when it is supported by a thrust cylinder and easily removing a kelly-bar guide. SOLUTION: A leader 2 erects on an earth drill mainbody 1. An earth drill bucket 7 is secured to the lower end of a kelly-bar 6. A kelly-bar drive 3 to rotate the kelly-bar 6 is mounted along the leader 2 in an elevatable manner. A kelly-bar guide 12 fitted through the kelly-bar 6 in a vertically movable manner is secured to the lower part of the kelly-bar drive 3 along the leader 2 in a vertical position-adjustable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leader type earth drill in which a leader is erected on an earth drill body, and a kelly drive device is mounted so as to be able to move up and down along the leader.

[0002]

2. Description of the Related Art A conventional leader-type earth drill has a kelly bar in which a leader is mounted on an earth drill body, a kelly drive device is mounted along the leader so as to be able to move up and down, and a ground drill bucket is attached to a lower end of the kelly bar. A vertical hole drilling machine for drilling by rotating the earth drill bucket through the kelly bar by rotating the kelly bar with the kelly drive device by inserting the kelly drive device into the kelly drive device so as to be able to move up and down. It is.

Such an earth drill is used as an ordinary vertical hole excavator. In addition, a casing having a cylindrical shape and having an excavation claw at a lower end is rotated while being pushed by a casing driver on the ground to build up the casing. It is also used in the case of excavating as described above, excavating earth and sand inside the casing and excavating it inside the ground.

In the conventional leader type earth drill, a kelly bar guide is fixed to an upper end portion of an outermost rod of the kelly bar, the kelly bar guide is slidably engaged with the leader guide, and drilling by an earth drill bucket is performed. As the vehicle travels, the upper end of the kerry bar is lowered along the guide so as to keep the kerry bar vertical.

A kerry bar is supported by a wire rope hanging down from the top of a boom attached to the earth drill body so as to be able to rise and fall, and a kelly bar is mounted on a top of a front frame attached to the earth drill body so as to be able to swing up and down. Boom type earth drill having a configuration in which a keriba is rotated by inserting
Japanese Patent Publication No. 0970 proposes a configuration in which a roller type kelly bar guide is provided in a frame below a kelly drive device.

[0006]

(1) In a conventional leader type earth drill, in a structure in which a kelly bar guide is provided on the top of the outermost rod of a multi-stage kelly bar,
As the excavation progresses, the upper end of Keliva descends,
When the distance between the kelly-bar guide and the kelly-drive device is reduced, and finally the kelly-bar guide touches the top of the kelly-drive device, there is no longer any distance between the fulcrums that holds the kelly-bar vertically, and thereafter the kelly-bar is moved vertically. , It is difficult to achieve the original purpose of the Keriba guide. That is, for example, Keriba is outside, inside,
In the case where the three hollow rods are fitted,
Since the innermost rod is supported by a wire rope hanging from the top of the leader via a swivel joint, the excavation proceeds while the kelly bar descends without extending the kelly bar in the first excavation stage, and then the outer rod Excavation progresses while the middle rod descends, and when the middle rod extends to the outer rod, excavation proceeds while the inner rod extends to the middle rod, but Keriva is the most extended When the excavation has progressed to about one third of the length, ie, the stage where the middle rod begins to extend relative to the outer rod, the outermost rod kelly bar guide contacts the upper part of the kelly drive device, In the subsequent excavation, the excavation proceeds in a state where there is almost no such vertical operation of the keleba. (2) Also, a thrust cylinder composed of a hydraulic cylinder is provided between the upper end of the reader and the Kelly drive device in order to raise and lower the Kelly drive device along the leader and to press the earth drill bucket through the Kelly bar onto the drilling surface. In the attached structure, the support of the thrust cylinder may be attached to the reader, but if such a support is provided, the support is obstructed, and the Keriba guide is attached slidably along the leader. You can't even do it. (3) Since the kerry bar guide is rotatable at the upper end portion of the kelly bar but fixed so as not to move up and down, the kelly bar guide is pulled up along the leader to the upper end portion of the leader when the kerry bar is mounted or removed. Must be removed from the thrust guide. As described above, since the operation of removing the kelly bar guide is all performed at a height of several tens of meters above the ground, it is difficult to control the operation and it takes time. (4) Since the guide device of the boom type earth drill is mounted on the lower portion of the front frame, it is difficult to make a large distance between the Kelly bar guide and the Kelly drive device, and the guiding action is weak.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can exert a guiding action regardless of the extended state of the kerry bar. An object of the present invention is to provide a leader type earth drill which has an advantage that it can exert an effect and that the removal of the kelly bar guide is easy.

[0008]

In order to achieve the above-mentioned object, an earth drill according to the first aspect of the present invention is arranged such that a leader is erected on the earth drill body, an earth drill bucket is attached to a lower end of the kelly bar, and the kelly bar is attached. A kelly drive device that is vertically inserted and rotated so as to be vertically movable is mounted along the leader so as to be able to move up and down, and a kelly bar guide that penetrates the kelly bar so as to be vertically movable is attached to the reader below the kelly drive device. Attached so that the vertical position can be adjusted along.

According to the first aspect of the present invention, since the kelly drive guide is mounted below the kelly drive device in the leader, the kelly drive device is lowered by the advance of the excavation depth, and the kelly drive device is located between the kelly drive device and the kelly bar guide. When the distance is reduced, the frictional engagement between the Kelly drive device and the Kelly bar is released, and by raising the Kelly drive device, the distance between the Kelly drive device and the Kelly bar guide can be increased. It is possible to ensure the vertical holding action regardless of the excavation depth. Further, it is possible to adjust the vertical holding action of the kelly bar by changing the distance between the kelly drive device and the kelly bar guide according to the hardness of the excavated ground, and also to adjust the height of the kelly bar guide according to the working environment and the height of the bucket used. It is possible to change the length.

A ground drill according to a second aspect of the present invention is characterized in that a hydraulic cylinder is provided as a vertical position adjusting means for the kelly bar guide.

In this configuration, the vertical position of the kelly bar guide can be easily adjusted.

The earth drill according to a third aspect of the invention is characterized in that the kelly bar guide is detachably attached to the reader.

[0013] In this configuration, when the kerry bar guide is unnecessary, the kelly bar guide can be removed.

According to a fourth aspect of the invention, there is provided an earth drill, wherein a kelly bar guide is detachably connected to the kelly drive device.

In this configuration, the distance between the Kelly drive device and the Kelly bar guide can always be ensured,
The vertical holding action of the keriba can always be ensured.

The earth drill according to a fifth aspect of the present invention is characterized in that a kelly bar guide is connected to the kelly drive device by a telescopic connecting means.

In this configuration, it is possible to adjust the vertical holding action of the kelly bar by changing the distance between the kelly drive device and the kelly bar guide according to the hardness of the excavated ground, and also to adjust the working environment and the height of the bucket used. By
It is possible to change the height of the keleba guide.

The earth drill according to a sixth aspect of the invention is characterized in that the connecting means is a hydraulic cylinder.

In this configuration, the distance between the Kelly drive device and the Kelly bar guide can be easily adjusted.

[0020]

FIG. 1 is a side view showing an embodiment of an earth drill according to the present invention, and FIG. 2 is a plan view showing a kelly bar guide thereof. 1 and 2, reference numeral 1 denotes a self-propelled earth drill main body, 2 denotes a leader which is generally vertically mounted on a front portion of the earth drill main body 1, and 3 denotes a vertically movable head along the reader 2. The mounted Kelly drive device 4 is a thrust cylinder composed of a hydraulic cylinder provided between the Kelly drive device 3 and the top of the reader.
Is a thrust cylinder support which is attached to the reader 2 and holds an intermediate portion of the thrust cylinder 4.

Reference numeral 6 denotes a kelly bar having an earth drill bucket 7 attached to a lower end thereof. The kelly bar 6 is inserted into a kelly bar insertion hole of a rotary drive plate (not shown) of the kelly drive device 3. The kelly bar 6 has a configuration in which three outer, middle, and inner hollow rods are fitted. 9 is the earth drill body 1
The winch 10 mounted thereon is a wire rope wound and fed by the winch 9. The wire rope 10 is hung down from the top of the leader 2, and is connected to the innermost rod of the kelever 6 via a swivel joint 11. Connected to.

Reference numeral 12 denotes a kelly bar guide, which has a guide tube 12a for guiding the outermost rod 6a of the kelly bar 6 so as to be vertically movable and rotatable as shown in FIG. The kelly bar guide 12 is fixed to the reader 2 by a fixing pin 14 that selects and penetrates one of a plurality of mounting holes 13 arranged at an interval above and below the reader 2 and has a high height. Mounted adjustable. In addition, the kelly bar guide 12 has guide grooves 12b respectively fitted on the left and right guide cylinders 15 on the inner surfaces on both sides in order to prevent a front-rear and left-right displacement. 16
Is attached to the lower end of the reader 2 and the
This is a stopper for preventing the falling of

As described above, since the kelly bar guide 12 is attached below the kelly drive unit 3 and below the leader 2, the kelly bar guide 12 and the kelly drive unit 3 are located at the beginning of excavation because the kelly drive unit 3 is above. Can be increased, and a high attitude control function of the kelly bar 6 can be exhibited. As the excavation depth increases, the Kelly drive device 3 descends, so that the distance H decreases. However, once the distance H decreases, the frictional engagement between the Kelly drive device 3 and the Kelly bar 6 is once released ( At this time, the frictional engagement between the rods of the kelly bar 6 is also released), and only the kelly drive device 3 is raised (so-called refilling operation is performed) to secure the distance H regardless of the excavation depth. it can.

Further, since the kelly bar guide 12 is mounted at a position lower than the kelly drive device 3, the kelly bar guide 12 can be mounted regardless of the presence or absence of the support 5 of the thrust cylinder 4. Also, the stopper 16
Can be removed from the reader 2 from below, so that when the kerry bar guide 12 becomes unnecessary, it can be easily removed.

Further, the Kelly bar guide 12 is provided with the fixing pin 1.
4, the height can be changed. Therefore, when installing a high-height bucket such as an expanded bottom bucket, or when installing the above-mentioned casing driver below the leader 3 and constructing a vertical hole, the kelly bar guide 12 is used. Can be set at a higher position. Further, it is possible to adjust the vertical holding action of the kelly bar 6 by changing the distance H between the kelly drive device 3 and the kelly bar guide 12 depending on the hardness of the excavated ground.

FIG. 3 shows an example in which a hydraulic cylinder 17 is provided as means for adjusting the height of the kerry bar guide 12. According to this configuration, the position of the kelly bar guide 12 can be easily adjusted.

FIG. 4 is a side view of an earth drill showing another embodiment of the present invention. In this embodiment,
The kelly drive device 3 and the kelly drive device 12 are connected by connecting means 19 such as a rod. According to this configuration, the distance H between the kelly drive device 3 and the kelly bar guide 12 can always be ensured, so that the vertical operation of the kelly bar 6 by the kelly bar guide 12 can be always ensured.

In the example shown in FIG. 4, the connecting means 19 is made of an extendable and retractable structure such as an extendable rod, so that the distance H is increased when a strong vertical holding action is required. The length can be adjusted.

Further, by using the hydraulic cylinder 20 as shown in FIG. 5 as the connecting means whose length can be adjusted, the distance H can be easily adjusted.

According to the present invention, as means for raising and lowering the Kelly drive device along the leader, a device using a winch and a wire rope, or a tune stretched along the leader is engaged with a drive sprocket mounted on the Kelly drive device. Other elevating devices, such as those of the type and the pinion-rack type, can be used.

[0031]

According to the first aspect of the present invention, a kelly drive device for erecting a leader on an earth drill body and rotating a kelly bar for attaching an earth drill bucket at a lower end is mounted along the leader so as to be able to move up and down. A kelly bar guide that penetrates up and down is mounted below the kelly drive unit so that the vertical position can be adjusted along the leader, so that the kelly drive unit descends as the excavation progresses, and the kelly drive unit and the kelly bar guide When the distance from the vehicle is short, the distance can be increased by raising the Kelly drive device again, so that the vertical holding action of the Kelly bar can be ensured even when the excavation depth becomes deep.

Further, since the kelly bar guide is mounted at a lower position than the kelly drive device, the kelly bar guide can be mounted regardless of the presence or absence of the support of the thrust cylinder. In addition, since the kelly bar guide can be removed below the reader, when the kelly bar guide becomes unnecessary, it can be easily removed without the need for work at a high place.

Since the height of the kelly bar guide can be changed, a height of a bucket such as an expanded bottom bucket is required, or a casing driver is installed below the leader to form a vertical hole. In such a case, the keriba guide can be set at a higher position. Further, it is possible to adjust the vertical holding action of the kelly bar by changing the distance between the kelly drive device and the kelly bar guide according to the hardness of the excavated ground.

According to claims 2 to 5, the following effects can be obtained in addition to the effects of claim 1. According to claim 2,
Since the hydraulic cylinder is used as the vertical position adjusting means, the position can be easily adjusted.

According to the third aspect of the present invention, since the Kellyver guide is detachably attached to the reader, when the Kellyver guide is unnecessary, it can be removed and work can be performed without hindering the work. Is obtained.

According to the present invention, since the kelly drive guide is detachably connected to the kelly drive device, the distance between the kelly drive device and the kelly bar guide can always be ensured, and the vertical holding action of the kelly drive is always ensured. You can do it.

According to the fifth aspect, in addition to the fourth aspect, the kelly drive guide is connected to the kelly drive device by an extendable connecting means, so that the distance between the kelly drive device and the kelly bar guide depends on the hardness of the excavated ground. Can be adjusted to adjust the vertical holding action of the keriba, and depending on the working environment and the height of the bucket used,
The effect is obtained that the height of the kellyba guide can be changed.

According to the sixth aspect, in addition to the effects of the fourth and fifth aspects, further, since the connecting means is a hydraulic cylinder, the distance between the kelly drive device and the kelly bar guide can be easily adjusted. can get.

[Brief description of the drawings]

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

FIG. 2 is a kelly bar guide of the earth drill of FIG. 1;

FIG. 3 is a side view showing another embodiment of the earth drill of the present invention.

FIG. 4 is a side view showing another embodiment of the earth drill of the present invention.

FIG. 5 is a side view showing another embodiment of the earth drill of the present invention.

[Explanation of symbols]

1: Earth drill body, 2: Leader, 3: Kelly drive device, 4: Thrust cylinder, 5: Support, 6: Kelly bar, 7: Earth drill bucket, 9: Winch, 1
0: wire rope, 11: swivel joint, 12:
Kelly bar guide, 13: mounting hole, 14: fixing pin, 1
5: guide cylinder, 16: stopper, 17: hydraulic cylinder,
19: connecting means, 20: hydraulic cylinder

Claims (6)

[Claims] An earth drill is mounted on the earth drill body, and an earth drill bucket is attached to a lower end of the kelly bar, and a kelly drive device for vertically inserting and rotating the kelly bar is mounted so as to be able to move up and down along the leader. An earth drill, wherein a kelly bar guide for vertically penetrating the kelly bar is mounted below the kelly drive device so as to be vertically adjustable along the leader. 2. The earth drill according to claim 1, wherein a hydraulic cylinder is provided as a vertical position adjusting means of the kelly bar guide. 3. The earth drill according to claim 1, wherein the kelly bar guide is detachably attached to the reader. 4. The earth drill according to claim 1, wherein a kelly bar guide is detachably connected to the kelly drive device. 5. The earth drill according to claim 4, wherein a kelly bar guide is connected to the kelly drive device by an extendable connecting means. 6. An earth drill according to claim 5, wherein said connecting means is a hydraulic cylinder.