JPH09310574A - Earth drill machine - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an earth drilling machine capable of smoothly performing an auxiliary suspending work subsequent to an excavation work and supporting a thrust force at the time of excavation to perform accurate excavation. SOLUTION: In the earth drill machine in which the kerry bar 3 is rotated while being rotationally driven by the kerry bar rotary drive device 5 to dig a vertical hole in the excavation bucket 4, a front frame 6 for mounting the kerry bar rotary drive device 5 is installed. The boom 2 is rotatably supported on the lower part thereof, and a hoisting cylinder 7 for supporting and hoisting the front frame 6 is rotatably supported on the vehicle body 1 so as to be slidable and slidable. The upper side of the undulating cylinder 7 is pivotally attached to the front frame 6 via a slider 21 that can be locked so as to prevent movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth drilling machine for excavating the ground with a drilling bucket by lowering while rotating a kerry bar having a drilling bucket attached to the lower end thereof, and particularly to a cast-in-place pile construction method. It is useful.

[0002]

2. Description of the Related Art In civil engineering and construction work, in order to increase the bearing capacity of a structure on the ground, a vertical hole is excavated to a good underground area of the ground, and reinforced concrete is poured into the vertical hole to form a foundation pile. The so-called cast-in-place pile method is being implemented. Conventionally, in such a cast-in-place pile method, a vertical hole excavator called an earth drill is commonly used. This earth drill machine has a kerry bar that is suspended from the top of a boom that can be raised and lowered on the main body of the self-propelled vehicle, and a drilling bucket is attached to the lower end of the kerry bar, and the kelly bar is located at the bottom of the boom. By lowering while rotating and driving by the device, the excavation bucket excavates underground and excavates a vertical hole. After excavating the vertical hole in this way, concrete pouring tremy pipes for placing reinforced concrete and suspension work of reinforcing bars are performed.
After the end of the excavation operation, it is desirable to use an earth drill machine so that the excavation operation can be performed continuously.

Conventionally, an earth drilling machine described in Japanese Utility Model Application Laid-Open No. 62-176284 has been proposed as a technique that can meet such demands. 62-1
The earth drill machine described in Japanese Patent No. 76284 generally employs a structure as shown in the side view of FIG.
That is, as described above, the kelly bar 3 is hung from the upper part of the boom 2 erected on the crawler-type self-propelled vehicle main body 1 serving as a base machine, and the excavation bucket 4 is attached to the lower end of the kelly bar 3. Boom 2 for 3
In an earth drilling machine in which a vertical hole is excavated by the excavation bucket 4 by being lowered while being rotationally driven by the keliver rotation driving device 5 arranged at the lower part, the "link having the base end pivotally supported on the lower side of the boom 2" 6 ₁ with connecting to Keriba rotary drive device 5, the link rods derricking cylinder 7 which pivotally supports the proximal end of the boom 2 to the rotation axis coaxially 6
By connecting to the middle part of _one is on the "intended to support the link 6 ₁ from below. Further, said in Japanese, as another example, in a similar ground drill machine, the link ₆₁ which is pivotally supported a "base end at the bottom side of the boom 2
Together with connecting to Keriba rotation drive device 5, the link by connecting the proximal end of link ₆₁ of the rod of the relief cylinders 7 than pivot point and pivotally supported by the boom 2 above, the distal end of the link 6 ₁ 6 ₁ is supported from above ”(the reference numerals are those shown in FIG. 11) are also disclosed. When such an earth drill machine is used, after the drilling of the vertical hole is completed, the undulating cylinder 7 is extended and the link 6 ₁ is rotated so as to approach the boom 2, so that the kerry bar rotation drive device 5 does not interfere with the auxiliary lifting work. Thus, it can be stored at a position close to the boom 2. The link 6 ₁ and the hoisting cylinder 7 are both attached to the boom 2 and tilt together with the tilting motion of the boom 2. Therefore, the boom 2 is kept in the state in which the kerry bar rotation driving device 5 is stored in this manner. The material for auxiliary lifting work can be suspended by leaning forward, and the auxiliary lifting work can be smoothly performed continuously with the excavation work.

[0004]

As described above, the conventional earth drill machine described in Japanese Utility Model Laid-Open No. 62-176284 is desirable in that the auxiliary lifting work can be smoothly performed following the excavation work. However, on the other hand,
There is a problem in that the thrust force during excavation cannot be sufficiently supported, and if such a thrust force occurs, accurate excavation cannot be performed. So when I mention this point,
In the earth drill machine, since the kelly bar 3 is bent during excavation, a thrust force is generated when trying to recover the original state. In addition, if the formation changes in the excavation region of the excavation bucket 4 such as a hard stratum and a soft stratum coexist in the excavation region, or if boulders are mixed in the excavation bucket 4, the excavation bucket 4 may cause the hard strata or cobblestone to be excavated during excavation. Pushing up force is generated by riding on. In the conventional earth drill machine described in the above publication, the hoisting cylinder 7 is pivotally supported by the boom 2, and the thrust force during excavation is supported by the limited weight of the boom 2. When a force is generated, as shown in FIG. 11, the boom 2 pivots around its pivotal support, and the thrust force cannot be sufficiently supported. As a result, the excavation bucket 4 jumps up due to the push-up force at the time of excavation and the excavation position shifts from the initial position. Therefore, in such an earth drill machine, a vertical hole is excavated at an accurate position and with an accurate shape. The problem arises that you cannot do that.

The present invention was created in order to solve the problems found in such conventional techniques. The purpose of the present invention is to smoothly perform an auxiliary hoisting work following an excavation work, and An object of the present invention is to provide an earth drill machine capable of supporting the thrust force and performing accurate drilling.

[0006]

The above objects of the present invention are as follows:
The kerry bar is hung from the upper part of the boom that stands upright on the base machine, an excavation bucket is attached to the lower end of this kerry bar, and the kerry bar is rotated and driven by the kerry bar rotation drive device located at the lower part of the boom to excavate. In an earth drill machine that is designed to dig a vertical hole with a bucket, "A front frame for mounting a kerry bar rotation drive device is rotatably supported in front of the earth drill machine and supports and expands and contracts this front frame. As a result, a hoisting cylinder for hoisting the hoisting cylinder is rotatably supported on the base machine, and a sliding mechanism is provided for slidably connecting the front frame and the hoisting cylinder, so that both can be slid. Prevents the front frame and the undulating cylinder from sliding while connecting via a mechanism It is achieved by providing a locking mechanism that can Rukoto ".

Since the earth drilling machine of the present invention adopts such technical means, when excavating a vertical hole, the earth drilling machine is set to a posture suitable for the excavating operation of the vertical hole, and the undulating cylinder is in front. The lock mechanism prevents the frame from sliding with respect to the frame, and thereafter, the kerry bar is driven to rotate by the kerry bar rotation drive device to be lowered to excavate the vertical hole with the excavation bucket. Since the undulating cylinder is pivotally supported by the base machine, when the vertical hole is excavated, the thrust force associated with the excavation can be received by the entire weight of the earth drill machine through the base machine. As a result, the thrust force associated with excavation can be sufficiently supported, the posture of the front frame can be prevented from changing due to the thrust force, and accurate excavation can be performed.

After completing the vertical hole excavation work in this way,
When carrying out auxiliary lifting work, after removing the excavation bucket from the kerry bar, extend the undulation cylinder while the sliding of the undulation cylinder is blocked by the lock mechanism, and rotate the front frame to approach the boom. Thus, the front portion of the earth drill machine such as the kelly bar rotation drive device can be stored at a position close to the boom so as not to disturb the auxiliary lifting work. When the boom is tilted forward to suspend the auxiliary lifting work material, the lock mechanism should be released to allow the undulating cylinder to slide with respect to the front frame when the front part is stored in this way. , The boom can be tilted significantly forward together with the front frame, even if the auxiliary lifting work material is located away from the front of the earth drill machine.
It can be suspended. In that case, even if the boom angle is changed while the hoisting cylinder is set in the state of auxiliary lifting work, the force of the sliding mechanism causes excessive force to act on the hoisting cylinder in the process of changing the angle. There is no. Therefore, the auxiliary lifting work can be continuously performed subsequent to the vertical hole excavation work. If you want to land the front part of the earth drill for inspection or disassembly, etc., use a lock mechanism to prevent the undulating cylinder from sliding against the front frame, and then shrink the undulating cylinder to reduce the front frame. And then release the lock mechanism to allow the undulating cylinder to slide with respect to the front frame, or after releasing the lock mechanism,
When the undulating cylinder is contracted, the front part of the earth drill machine can be tilted to a position where a worker on the ground can easily perform such work.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be clarified by describing concrete examples showing how the present invention is actually embodied with reference to FIGS. 1 to 10. To do. FIG. 1 is a side view showing the overall structure of an earth drill machine according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view showing a sliding mechanism and a lock mechanism in the earth drill machine according to an embodiment of the present invention. 3 is an enlarged perspective view showing only the sliding mechanism portion of the earth drill machine according to the embodiment of the present invention in an enlarged manner, and FIG. 4 shows the sliding mechanism and the lock mechanism in the earth drill machine according to the embodiment of the present invention. 5 is an enlarged arrow view in the direction of arrow A in FIG. 1, FIG. 5 is a sectional view taken along the line BB in FIG. 4, and FIG. 6 is a view showing a state in which the lock cylinder is contracted to release the lock mechanism of the slider. 7 is a view similar to FIG. 1 showing a state in which the kerry bar rotation drive device is stored at a position close to the boom to perform auxiliary lifting work, and FIG. 8 is a view in which the boom is tilted forward. FIG. 9 showing a state similar to FIG.
FIG. 10 is a side view of a main part of an earth drill machine according to a specific example of the present invention, which schematically shows a state in which the front frame is tilted down and the front part is lowered to the ground. FIG. It is a figure similar to FIG. 1 which shows a state. In addition,
In FIG. 9, only the main part of the earth drill machine is shown in detail, and the self-propelled vehicle body is schematically illustrated.

First, with reference to FIG. 1 and FIG. 9, general technical contents of the technical contents concerning the earth drilling machine of the embodiment of the present invention will be described. In FIG. 1, reference numeral 1 denotes a crawler-type self-propelled vehicle main body serving as a pace machine, 2 denotes a boom standing upright on the self-propelled vehicle main body 1, and 3 denotes a boom suspended on a rope 3a wrapped around the boom 2. The suspended kelly bar 4 is a digging bucket attached to the lower end of the kelly bar 3, and the reference numeral 5 is a kelly bar rotation driving device for driving the kelly bar 3 to rotate. As shown in FIG. 9, the boom 2 is rotatably supported by a pin 14 on a bracket 13 provided at the front of the self-propelled vehicle body 1, and is installed so that the boom 2 can be raised and lowered by a rope 2a. ing. The excavation bucket 4 has a cutter on the lower surface of the bottom cover, and can take in the excavated earth and sand by the cutter, and can discharge the excavated earth and sand by opening the bottom cover. The kerry bar rotation driving device 5 applies a rotational force to the excavation bucket 4 by inserting the kerry bar 3 into the torque transmitting portion and rotating the kerry bar 3 to rotate. Therefore,
When the kerry bar 3 is rotationally driven by the kerry bar rotation driving device 5, the rope 3a is gradually fed out and a thrust force is applied to the excavation bucket 4 by the weight of the kerry bar 3, the excavation bucket 4, etc. You can dig in to drill a vertical hole. Further, when a predetermined amount of excavated soil is accumulated in the excavation bucket 4 in the process of excavating underground, the rope 3a is wound up, the excavation bucket 4 is pulled up to the ground, and the excavated earth and sand is discharged. In the earth drill machine, a vertical hole having a predetermined depth is drilled by repeating these steps.

Next, with reference to FIGS. 1 to 6 and 9, the technical contents peculiar to the embodiment of the present invention and the specific structure of the earth drill machine directly related to the technical contents will be described. In these drawings, 6 is a front frame for mounting the kerry bar rotation driving device 5, 7 is a hoisting cylinder for hoisting the front frame 6 by supporting and expanding the front frame 6, and 8 is an auxiliary hoisting work. Supplementary rope for suspending materials, 9 is this supplementary rope 8
A supplementary winding hook provided at the tip of the hook for catching the auxiliary hanging work material, 10 is a tremie as the auxiliary hanging work material, 18 is the front frame 6 is tilted down, and the front part of the earth drill machine of the kerry bar rotation drive device 5 is landed. It is a receiving part for grounding when making it. Front frame 6
Is rotatably supported at the lower part of the boom 2 in this embodiment, and is installed so as to be able to descend. That is, as well shown in FIG. 9, a bracket 11 is fixed to the boom 2 at a position slightly above the bracket 13 that pivotally supports the boom 2, and the front frame 6 is pivoted on the bracket 11 by a pin 12. It is pivotally supported. The front frame 6 has a lower frame 6a provided so as to be swingable and an upper frame 6b attached to the lower frame 6a, and a thrust cylinder (not shown) is provided in the upper frame 6b.
The kerry bar rotation drive device 5 that moves up and down is mounted.
A pair of undulating cylinders 7 are provided at a predetermined interval, and a check valve (not shown) is provided inside or outside,
This check valve allows pressure oil to be locked.
As will be described in detail below with reference to FIGS. 2 to 6, the pair of undulating cylinders 7 has a shaft 17 with a pin 17 on the front frame 6 via a bracket 21a of a sliding mechanism having an upper end portion provided on the front frame 6. The upper and lower ends of the undulating cylinder 7 are slidably attached to the front frame 6 by a sliding mechanism, and the lower end is pivotally supported by the self-propelled vehicle main body 1 as a base machine. The lock mechanism that can prevent the

Therefore, the sliding mechanism and the locking mechanism will be described with reference to FIGS. First, the sliding mechanism will be described. Reference numeral 21 is a slider in which the upper end portions of the piston lots of the pair of undulating cylinders 7 are axially mounted, 22 is a receiving bracket for guiding the slider 21 slidably, and 2
Reference numerals 5 and 26 are slide plates made of nylon or the like having a small friction coefficient. The slider 21 has a pair of brackets 21a fixed on both sides of the front surface,
Each piston lot of the undulating cylinder 7 is rotatably attached by a pin 17 through the pair of brackets 21a. The receiving bracket 22 includes a board 22a and the board 2a.
The guide member 22b is provided along both sides of the front surface of 2a and is fixed to the front surface of the front frame 6. Slider 21 and receiving bracket 2
A trapezoidal notch recess 27 is formed in the center of the lower end of each of the second substrates 22a. Each of the guide members 22b of the receiving bracket 22 has a square bracket cross section so that a guide groove for slidably guiding the slider 21 is formed. Slide plates 25 and 26 are fixed to the front and rear sides of the slider 21, respectively.
1 can slide smoothly in the guide groove of the guide member 22b via these slide plates 25 and 26. The structural relationship among the slider 21, the bracket 21a, and the slide plates 25 and 26 is shown in FIG.
It is enlarged and shown in FIG. It should be noted that the slider 21 is not shown in the figure because when the lock mechanism described later is released in order to slide the slider 21, the slider 21 freely slides and the front frame 6 in the forward tilted state rapidly tilts forward. However, there is provided a sudden forward lean restraining means for restraining a sudden forward lean of the front frame 6. For example, the front frame 6 is connected to a rope that can be gradually extended from the boom 2, and the slider 21 is slid while being restrained by the rope to prevent the front frame 6 from leaning forward abruptly. By connecting the hydraulic cylinder attached to the frame 6 to the slider and sliding the slider 21 while restraining the hydraulic cylinder to restrain the slider 21 from freely moving, the front frame 6 is rapidly tilted forward. Means for preventing sudden inclination such as deterrent are provided.

The lock mechanism will be described. Reference numeral 20 denotes a lock cylinder attached to the front frame 6 for locking the slider so that it cannot slide.
Reference numeral 23 denotes a seat which is fixed to the front surface of the slider 21 and has a receiving hole at the end for inserting the piston rod of the locking cylinder 20. Reference numeral 24 denotes a piston rod of the locking cylinder 20 which is fixed to the front surface of the front frame 6. Is a bracket having a fitting insertion hole for fitting. The lock cylinder 20 is attached to the front frame 6 via a pedestal 6c fixed to the front surface of the front frame 6. As shown in FIG. 5, the locking cylinder 20 slides with respect to the bracket 22 by receiving the slider 21 by extending the piston rod and inserting the lock pin 20 a at the tip thereof into the insertion hole of the receiving seat 23. Lock it to prevent it. A pair of brackets 24 are provided so as to sandwich the seat 23, and are inserted when the lock pin 20a at the tip of the piston rod of the lock cylinder 20 is inserted into the seat 23, and the lock pin 20a is inserted into the front frame 6. It works to firmly fix the machine to the side. The lock cylinder 20 and the seat 23 are trapezoidal cutout recesses 27 formed in the substrate 22 a of the slider 21 and the receiving bracket 22.
It is placed inside so that it can be installed and installed well.

Since the earth drilling machine of this embodiment has the above-mentioned structure, when excavating a vertical hole, the standard posture shown in FIG. 1 is suitable for the excavating operation of the vertical hole. And the lock cylinder 20 is extended to fit the lock pin 20a into the fitting hole of the seat 23, as shown in FIG.
The lock mechanism prevents the keller from sliding on the front frame 6, and thereafter, while the kerry bar rotation driving device 5 rotationally drives the kerry bar 3, the rope 3a is gradually fed out to excavate the vertical hole with the excavation bucket 4. When excavating a vertical hole, it receives an excavation reaction force, but since the check valve provided in the undulating cylinder 7 locks the pressure oil, the undulating cylinder 7 is pivotally supported by the vehicle body 1 as a base machine. The excavation reaction force can be received not only by the weight of the front frame 6 but also by the self-propelled vehicle body 1 through the undulating cylinder 7, and eventually by the weight of the entire earth drill machine through the self-propelled vehicle body 1. be able to. Therefore, according to this embodiment, it is possible to sufficiently support the thrust force during excavation, prevent the posture of the front frame 6 from changing due to the thrust force, and perform accurate excavation.

After completing the vertical hole excavation work in this way, an auxiliary drilling work, for example, a concrete pouring tremie pipe for placing reinforced concrete, can be carried out when an earth drill machine can be drilled. First, the excavation bucket 4 is removed from the kelly bar 3 in the state as shown in FIG. Then slider 2
When the hoisting cylinder 7 is extended with the lock mechanism still working so as to prevent the sliding of No. 1, the front frame 6 is rotated so as to approach the boom 2 and the posture shown in FIG. 7 is taken. Therefore, the kelly bar rotation drive device 5 can be stored at a position close to the boom 2 so as not to interfere with the auxiliary lifting work. Thereafter, in this state, the boom 2 is tilted forward, and the tremie pipe 10 placed in front of the earth drill machine is suspended by the hook 9 at the tip of the auxiliary winding rope 8.

Explaining the operation concretely, in the state where the kerry bar rotation drive device 5 is stored as described above,
As shown in FIG. 6, the lock cylinder 20 is contracted to remove the lock pin 20a from the fitting hole of the receiving seat 23, thereby releasing the lock mechanism of the slider 21 and allowing the slider 21 of the slide mechanism to slide. Then, the boom 2 is moved to the front side as shown in FIG. 8 while preventing the front frame 6 from being suddenly inclined forward by the above-mentioned sudden forward inclination preventing means such as a rope which can be gradually extended from the boom 2. The frame 6 is tilted largely forward. In this case, the boom 2 with the hoisting cylinder 7 set in the state of auxiliary lifting work
Even if the angle is changed, due to the action of the sliding mechanism, an unreasonable force does not act on the undulating cylinder 7 in the process of changing the angle. Further, due to the action of this sliding mechanism, the boom 2 can be largely tilted forward without being restricted by the front frame 6, so that the tremie tube 10
Can be hung smoothly even if is located away from the front of the earth drill machine. After suspending the tremie pipe 10, if the boom 2 is tilted backward so as to return to the initial position again, as shown in FIG. 7, the tremie pipe 10 is grounded so that the concrete can be poured. Can be set on the machine.

As described above, by using the earth drill machine of this embodiment, the front portion of the earth drill such as the kelly bar rotary drive device 5 and the front frame 6 is removed without disturbing the front portion of the earth drill. It can be stored in a position where it does not occur, and can be smoothly suspended even if the auxiliary suspending work material such as the tremie pipe 10 is located away from the front part of the earth drill machine. Therefore, according to this specific example, it is possible to continuously and smoothly perform the auxiliary suspending work such as the suspending work of the tremie pipe 10 following the excavation work of the vertical hole.

When the front portion of the earth drill such as the kelly bar rotation drive device 5 is to be landed for inspection or disassembly, the lock mechanism is operated so as to prevent the slider 21 from sliding. The undulating cylinder 7 is contracted to the front, and the front frame 6 is tilted down to bring the front portion of the kerry bar rotation drive device 5 or the like close to the ground. Then, the lock mechanism of the slider 21 is released to release the slider 21.
The front frame 6 can be
Tilts toward the ground due to its own weight, and as shown in FIG.
The receiving portion 18 can be brought forward to a state where the receiving portion 18 comes into contact with the ground and the front portion of the kelly bar rotation drive device 5 or the like can be landed. In this way, when the front frame 6 is tilted to the ground side by its own weight so that the slider 21 can be slid, the front frame 6 is suddenly moved to the ground side by using the above-mentioned sudden forward tilt suppressing means as necessary. Prevent leaning. For the convenience of explanation, the method of sequentially operating the undulating cylinder 7 and the lock mechanism to land the front portion of the kelly bar rotation drive device 5 or the like has been described above. However, after releasing the lock mechanism of the slider 21, the undulating cylinder 7 is released. Even if the size is reduced, the front part can be landed.

Therefore, according to this embodiment, the front portion of the earth drill machine such as the kelly bar rotary drive device 5 is
When you want to land on the ground for inspection, disassembly, repair, etc., you can land the boom 2 without tilting it on the ground, and even if you can not tilt the boom 2 on the ground due to the restrictions of the excavation work site,
The front part can be landed, and work such as inspection, disassembly, and repair can be smoothly performed. In addition, in this specific example, the example in which the front part of the earth drill machine such as the keliver rotation drive device 5 is particularly landed is shown. However, when the front part is inspected, disassembled, and repaired, the front part is There is no need to allow full contact with the ground, as it is only necessary to be able to descend to a position where ground workers can easily perform such operations. Therefore, when embodying the present invention, it is easy for a ground worker to inspect, disassemble, repair, etc. the front portion of the earth drill machine in cooperation with the undulating cylinder 7, the sliding mechanism and the lock mechanism. It only needs to be able to descend to the position.
In this specific example, when the front frame 6 is rotatably supported, it is supported on the lower portion of the boom 2 by way of example.
It is clear that the object of the present invention can be achieved even by directly supporting the self-propelled vehicle body 1. Therefore, the object of the present invention is not necessarily limited to this example, and the point is that the object of the present invention can be achieved. It suffices that the front frame 6 is pivotally supported in the front in the range, and where the front frame 6 is pivotally supported is a matter of design choice.

[0020]

As is apparent from the above description, according to the present invention, the kerry bar is hung from the upper part of the boom that is erected so as to be elevated on the base machine, and the excavation bucket is attached to the lower end of the kerry bar to boom the kerry bar. In the earth drill machine that is designed to dig a vertical hole with an excavation bucket by lowering it while rotationally driving it with the kerry bar rotary drive device arranged at the bottom, "The front frame for mounting the kerry bar rotary drive device is located in front of the earth drill machine. Rotatably supported on the base machine, and an undulating cylinder for undulating the front frame by supporting and extending the front frame so as to rotatably support the base machine and sliding the front frame and the undulating cylinder. A sliding mechanism is provided for possible connection, and both can be connected via this sliding mechanism. , A lock mechanism that can prevent the front frame and the undulating cylinder from sliding is provided, so that the auxiliary lifting work can be performed smoothly following the excavation work, and the thrust force during excavation can be supported. An earth drill machine that can perform accurate drilling is obtained. Even if the boom cannot be tilted to the ground due to the restrictions of the excavation work site, the front part of the ground drill machine can be lowered to a position where it is easy for a worker on the ground to perform inspection, disassembly, repair, etc. Work such as inspection, disassembly, and repair of the front part can be performed smoothly.

[Brief description of drawings]

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

FIG. 2 is an enlarged perspective view showing a sliding mechanism and a lock mechanism in an earth drill according to an embodiment of the present invention.

FIG. 3 is an enlarged perspective view showing only a sliding mechanism portion in an earth drill machine according to a specific example of the present invention in an enlarged manner.

FIG. 4 is an enlarged view in the direction of arrow A in FIG. 1 showing a sliding mechanism and a lock mechanism in the earth drill according to an embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a view similar to FIG. 5, showing a state in which the locking cylinder is contracted to release the lock mechanism of the slider.

FIG. 7 is a view similar to FIG. 1, showing a state in which the kerry bar rotation drive device is stored at a position close to the boom and an auxiliary lifting operation is performed.

FIG. 8 is a view similar to FIG. 1, showing a state in which the boom is tilted forward.

FIG. 9 is a side view of the essential parts of the earth drill machine according to the specific example of the present invention, which schematically shows a state in which the front frame is tilted down and the front part is lowered to the ground.

FIG. 10 is a view similar to FIG. 1, showing a state in which a thrust force is being applied during excavation.

FIG. 11 is a side view showing the overall structure of a conventional earth drilling machine, showing a state in which a thrusting force is applied during excavation.

[Explanation of symbols]

 1 Self-propelled vehicle main body 2 Boom 3 Kerry bar 4 Excavation bucket 5 Kerry bar rotary drive device 6 Front frame 7 Elevating cylinder 8 Supplementary winding rope 9 Supplementary winding hook 10 Tremy tube 20 Locking cylinder 20a Lock pin 21 Slider 22 Receiving bracket 23 Receiving 24 Bracket 25, 26 Slide plate

Claims (1)

[Claims] 1. A kerry bar is hung from an upper part of a boom erected so as to be elevated on a base machine, an excavation bucket is attached to a lower end of the kerry bar, and the kerry bar is rotationally driven by a kerry bar rotation drive device arranged at the lower part of the boom. In an earth drill machine in which a vertical hole is excavated by lowering the excavation bucket, a front frame for mounting a kerry bar rotation drive device is rotatably supported in front of the earth drill machine, and the front frame is An undulating cylinder for supporting and extending the undulating cylinder is rotatably supported by the base machine, and a sliding mechanism for slidably connecting the front frame and the undulating cylinder is provided. And the front frame and the undulating cylinder slide together. A ground drill machine characterized by having a lock mechanism that can prevent it from falling.