JPH0428877B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large-diameter drilling device used for excavating pile holes and the like.

[Conventional technology]

When the casing is rotated and placed in the ground for pile construction, only the portion cut by the casing is excavated inside, making it possible to excavate large-diameter holes.

Among such excavators, a low-level, large-diameter excavator as shown in FIG. 5 is known.

Base machine 7 having a moving mechanism such as a crawler
A casing drive device 2 is coupled to the leader of a leader mast 8 installed upright so as to be able to move up and down. It consists of a chuck device 6 to the outer periphery, and the speed reducer 5 and chuck device 6 are donut-shaped with a through hole through which the excavation casing passes through the center.

If the casing 1 is set so as to pass through the reducer 5 and the chuck device 6, and the chuck device 6 is pressed and fixed to the outer periphery of the casing 1 and the motor 4 is started, the reducer 5 is rotated and the rotational torque of the motor 4 is increased. is transmitted to the casing 1, which also rotates and is press-fitted into the ground.

At the same time, if an excavation means such as an earth removal bucket 3a suspended by a crane 3 or the like or an auger screw is inserted into the casing 1 from above, the earth and sand inside the casing 1 will be excavated and removed by this excavation means and the hole will be drilled. It will be done.

If the excavation equipment shown in FIG. 5 is used, at least the casing drive device 2 can be kept at a low position when adding casings 1, so the work at heights is reduced accordingly and stability is increased.

[Problems to be Solved by the Invention] However, in the excavation apparatus shown in FIG. 5, the casing 1 is built first, and then the earth and sand inside the casing 1 is excavated by an excavation means as a subsequent process, so-called two-step excavation. Since large-diameter excavation is carried out at the same time, the efficiency of excavation and soil removal in hard rocky ground is extremely poor.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
The leader mast takes advantage of the advantage of conventional low-level excavators in that it only requires a short length, and by installing it on a pedestal, it becomes compact enough to be installed in narrow spaces. Work can be streamlined by allowing excavation to be carried out at the same time, and the auger drive device that gets in the way when adding casing can be removed without having to hold it at a high place, so work can be done more quickly and stably. In addition, it is an object of the present invention to provide a large-diameter excavating device that is easy to use because the orientation of the mount can be freely changed without providing a large-scale moving mechanism.

[Means to solve the problem]

In order to achieve the above object, the present invention erects a short leader mast on a pedestal with level jacks as legs, and connects a casing drive device that rotates the casing to the leader of the leader mast through a chuck device to the outer periphery of the casing. The sub-leader mast, which is mounted on the casing drive device, is also slidably engaged with the leader mast, and is supported by an elevating jack on the pedestal. The gist is that an auger drive device that hangs from above is engaged with the leader in a removable and slidable manner, and that a swinging jack that lifts the pedestal so that it can pivot is provided on the underside of the pedestal. .

[Effect]

According to the present invention, the casing and the auger screw are always driven simultaneously, and rotary excavation and earth removal excavation are performed simultaneously.

Further, the auger drive device can be separated from the casing drive device by simply hanging it from above and engaging the leader of the sub-leader mast above the casing drive device. Therefore, when adding a casing, the auger drive device can be easily removed by lifting it with a crane. In addition, the auger drive device can be reset by simply lifting it down with a crane.

On the other hand, if the turning jack is extended, the entire gantry can be lifted up by the jack, and the entire gantry can be turned around the jack to easily move it in any direction.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view of a large-diameter excavation device of the present invention, and FIG. 2 is a front view of the same.

10 in the figure is level jack 1 as a leg around the periphery.
1, a short leader mast 12 is erected on the mount 10, and a casing drive device 13 is provided to be slidably engaged with the leader 12a of the leader mast 12 and to be movable up and down. Although not shown, the casing drive device 13 incorporates a motor and a speed reducer, and connects a chuck device 14 to the outer periphery of the casing to a rotary output shaft 13a surrounding a central through hole.
It is designed to be driven in rotation. Further, the casing drive device 13 is supported on the pedestal 10 by an elevating jack 15 so as to be vertically movable. 14 in the diagram
a is a chuck cylinder of the chuck device 14;

The sub-leader mast 16 is erected on one side of the casing drive device 13, and the auger drive device 17 of the auger screw 18 is lowered onto the leader 16a using a crane or the like and is removably engaged.

Note that the sub-leader mast 16 is connected to the leader 1 of the leader mast 12 in the same way as the casing drive device 13.
2a in a slidable manner.

The auger drive device 17 also incorporates a motor and a speed reducer, although not shown, and has an output shaft 17a protruding downward.

On the other hand, on the lower surface of the pedestal 10, directly below the leader mast 12, a swinging jack 19 for lifting the pedestal 10 so as to be able to pivot is provided to protrude downward.
Above is a generator 20 that serves as a power source for driving the motor.
was placed.

FIG. 4 shows details of the mounting portion of the swinging jack 19, and the pedestal 10 and the jack 19 are connected via a bearing 19a.

Next, usage and operation will be explained.

As described above, the auger drive device 17 is attached to the leader 16a of the sub-leader mast 16 so as to be movable up and down.

In this way, if the chuck device 14 grips the outer periphery of the casing 21 and the drive device 13 rotates the chuck device 14, the casing 21
It also rotates. When the elongated lifting jack 15 is also released, it contracts, the drive device 13 and the chuck device 14 are lowered, and the casing 21 is inserted into the ground while rotating.

At the same time, the driving device 17 drives the casing 2.
When the auger screw 18 inserted into the casing 21 is rotated, the earth and sand in the casing 21 is excavated and removed by the auger screw 18.

The drive device 13 and the chuck device 14 move up and down as the lifting jack 15 expands and contracts, and the gripping point of the chuck device 14 on the casing 21 moves to the upper part, so the casing 21 is built up one after another. be.

The drive device 17 is an auger screw 18.
The reaction force of the torque generated when rotating the excavator can be taken by the sub-leader 16, and stable excavation can be performed.

When adding the casing 21, if the auger screw 18 and the output shaft 17a are separated and the drive device 17 is lifted upward with a crane, it can be removed from the leader 16a of the sub-leader 16 and the drive device 17 can be moved to another location. I can do it. As a result, there is nothing at the upper end of the casing 21, and it is possible to add to the casing 21 from above.

Further, the auger screw 18 is added, and the drive device 17 is again lowered by a crane and engaged with the sub-leader mast 16 on the drive device 13 to continue excavation.

When positioning the pedestal 10 during installation or changing the excavation position, the swing jack 19 can be extended, and if necessary, the level jack 11 can be reduced, so that the entire pedestal 10 can be moved by the swing jack 19.
The entire pedestal 10 can be pivoted in any direction using the jack 19 as an axis.

〔Effect of the invention〕

As described above, the large-diameter drilling equipment of the present invention has
Since the casing and auger screw are inserted into the ground at the same time, the conventional two processes can be carried out in one, streamlining the process.Furthermore, it can be installed using a relatively small frame, making the whole compact and suitable for use in urban areas and other narrow spaces. It can be used anywhere.

Furthermore, when replenishing the casing, the auger drive device can be easily moved to another location so that there is nothing above the casing, so stable replenishment work can be performed without requiring work at heights.

Furthermore, the entire structure can be easily changed in any direction without the need for a large-scale moving mechanism.
It is easy to use.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the large-diameter drilling equipment of the present invention, Fig. 2 is a front view of the same as above, Fig. 3 is a longitudinal sectional front view showing details of the chuck device portion to the outer periphery of the casing, and Fig. 4 5 is a longitudinal sectional front view of a turning jack attachment part, and FIG. 5 is a side view showing a conventional example. DESCRIPTION OF SYMBOLS 1...Casing, 2...Driving device, 3...Crane, 3a...Earth removal bucket, 4...Motor, 5...Reducer, 6...Chuck device, 7...
Base machine, 8... Leader mast, 10... Frame, 11... Level jack, 12... Leader mast, 12a... Leader, 13... Casing drive device, 13a... Output shaft, 14... Chuck device, 14a... Cylinder for chuck, 15...
...Lifting jack, 16...Subleader mast, 1
6a... Leader, 17... Auger drive device, 1
7a... Output shaft, 18... Auger screw, 1
9... Swinging jack, 19a... Bearing,
20... Generator, 21... Casing.

Claims (1)

[Claims] 1. A short leader mast is erected on a pedestal with level jacks as legs, and a casing drive device that rotationally drives the casing is slidably engaged with the leader of the leader mast via a chuck device to the outer periphery of the casing. Further, a sub-leader mast which is supported by an elevating jack on the mount and which stands up on the casing drive device is also slidably engaged with the leader mast, and an auger drive which is suspended from above on the leader of the sub-leader mast. A large-diameter excavating device characterized in that the device is detachably and slidably engaged with the device, and a swinging jack for lifting the pedestal in a protruding manner is provided on the underside of the pedestal.