JPH0465953B2 - - Google Patents

Description

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

[Conventional technology]

A casing auger construction method is known in which a casing is placed outside the screw when excavating with an auger screw for pile construction.

The excavation equipment used in this method is a driving device that moves up and down along a long leader mast.
Both the drive device for driving the screw and the drive device for driving the casing are connected to form an integrated drive device.

In the casing auger, the drive device for driving the screw of the drive device for driving the casing cannot be moved up and down separately, so the casing and screw are always inserted into the ground in a fixed relative positional relationship, and the casing and screw When replenishing the leader mast, both drive devices must be raised to a high place to ensure a large space along the leader mast for the replenishment.

As an improvement on the drawbacks of the casing auger, the casing 1 shown in Fig. 4 has been developed.
This excavation combines a casing drive device 2 that presses the casing 1 into the ground while rotating, and an earth auger 3 that is suspended from above into the casing 1 and is made up of a screw drive device 3a and an auger screw 3b. There is a device.

The casing drive device 2 includes a motor 4;
It consists of a reducer 5 connected to the reducer 5, and a chuck device 6 connected to the outer periphery of the casing connected to the reducer 5,
The speed reducer 5 and the chuck device 6 are donut-shaped and have a through hole through which the excavation casing passes through the center.

Further, the drive device 2 itself is coupled to a leader of a leader mast 8 erected on a base machine 7 having a moving mechanism such as a crawler so as to be movable up and down.

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, when the auger screw 3b of the earth auger 3 is rotated by the screw drive device 3a, the earth and sand in the casing 1 is excavated and removed by the auger screw 3b, thereby drilling a hole.

If the excavation equipment shown in FIG. 4 is used, the driving devices for the casing 1 and the auger screw 3b move up and down separately, so the preceding excavation position of either the casing 1 or the auger screw 3b is different. This allows for more effective excavation compared to the conventional casing auger method.

Further, when adding the casing 1 and the auger screw 3b, at least the casing drive device 2 can be kept at a low position, so the work at heights is reduced accordingly and stability is increased.

[Problem to be solved by the invention]

However, in the excavation rig shown in FIG. 4, both the casing drive device 2 and the screw drive device 3a move up and down along the same leader mast 8, so a long leader mast 8 is required, and the casing When replenishing, the screw driving device 3a located at the top gets in the way, so work at high places is still required, such as holding it at the top of the leader mast 8.

On the other hand, there is an excavator disclosed in Japanese Patent Application Laid-Open No. 53-39604 that allows the mast to be significantly shortened, thereby increasing the stability of the entire construction machine.

In this system, a short leader mast is mounted vertically on the front part of a base machine, and a support ring that rotatably and slidably supports a casing is engaged with a guide rod of this short leader mast so as to be able to move up and down.

In addition, a casing press-fitting device is installed in the frame-shaped frame at the lower end of the leader mast, and a frame is attached to the upper end of the casing in a non-rotatable but removable manner, allowing the auger screw to rotate and slide freely within the casing. At the same time, the auger screw rotation drive unit is supported by the frame, and the excavation torque reaction force of the auger screw is supported by the casing.

However, the excavator disclosed in Japanese Unexamined Patent Publication No. 53-39604 uses a base machine, which is heavy equipment, and the entire device is large in size as in the conventional excavator.

Further, in order to attach the frame to the upper end of the casing in a non-rotatable and detachable manner, a cap is provided on the frame, and this cap is fitted onto the upper end of the casing and fixed with a lock pin.

Therefore, in order to add a casing, it is necessary to remove the lock pin and remove the cap together with the frame, which is troublesome and time-consuming.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
There is no need to use a base machine, and since the leader mast is short, the entire device can be made smaller, and the screw drive device, which gets in the way when adding casings, can be easily and quickly removed without having to hold it in a high place. The purpose is to provide a drilling rig that can be removed.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a short leader mast erected on a frame provided with an outrigger, a casing drive device that is movable up and down along the leader of the leader mast, and a casing drive device that is movable up and down along the leader of the leader mast. The device is supported on a frame by a lifting jack so as to be able to move up and down, and on this casing drive device, a torque receiver with two pillars with a distance between them is installed, and a screw drive supported by a second lifting jack is installed. The gist of the device is to removably engage a part of the body with the torque receiver and suspend and lower the device onto the casing drive device from above.

[Effect]

According to the present invention, the screw drive device is simply placed on the casing drive device, and the two can be separated. Therefore, when adding a casing, the screw drive device can be easily removed by lifting it with a crane. In addition, to reset the screw drive device, it is only necessary to lift it down with a crane, and a part of the mounted screw drive device engages with the torque receiver on the casing drive device side, so when driving also remains stable.

〔Example〕

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

FIG. 1 is a partially cutaway front view of the excavation apparatus of the present invention, and FIG. 2 is a side view of the same.

In the figure, reference numeral 10 denotes a pedestal with outriggers 11 on its periphery, and a short leader mast 12 is mounted on this pedestal 10.
is erected, and the leader 12a of this leader mast 12
A casing drive device 13 is provided so as to be movable up and down along the casing. The casing drive device 13 incorporates a motor and a speed reducer (not shown), 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 rotationally driven. Further, the casing drive device 13 is supported on the pedestal 10 by an elevating jack 15 so as to be vertically movable. In the figure, 14a is a chuck cylinder of the chuck device 14.

On this casing drive device 13, a torque receiver 16 consisting of two pillars spaced apart was provided upright.

In the figure, 17 is a drive device for the auger screw 18, which is equipped with a lifting jack 19 on the side as shown in FIG. An engaging portion 20 having the above-mentioned shape is provided. This screw drive device 17 also incorporates a motor and a speed reducer, although not shown, and has an output shaft 17a protruding downward.

Next, usage and operation will be explained.

The screw drive device 17 is a lifting jack 19
The engaging portion 20 is inserted between the columns of the torque receiver 16.

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. Then, when the extended lifting jack 15 is released, it is contracted, 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 1 is rotated and the elevating jack 19 is released, 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. Furthermore, the extension of the elevating jack 19 is synchronized with the elongation of the elevating jack 15, so that the auger screw 18 is also sequentially inserted deeply.

Then, the drive device 17 is driven by the auger screw 18.
The reaction force of the torque generated when rotating the excavator can be absorbed by the torque receiver 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, the engaging portion 2
0 comes out from between the torque receivers 16, and this drive device 17 can be moved to another location. the result,
The upper end of the casing 21 is left blank, and the casing 21 can be added to from above.

Furthermore, the auger screw 18 is added, and the drive device 17 is again lowered by a crane and placed on the drive device 13 to continue excavation.

〔Effect of the invention〕

As described above, the drilling equipment of the present invention does not require the use of a base machine when it is equipped with a casing drive device and a screw drive device for simultaneously inserting the casing and the auger screw into the ground. Since the leader mast is short, the entire device can be made smaller, and when adding casings, the screw drive device can be easily moved to another location so that there is nothing above the casing, which eliminates the need for work at heights. This allows for stable replenishment work.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing one embodiment of the excavation device of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a plan view of the screw drive device, and Fig. 4 is a conventional example. FIG. DESCRIPTION OF SYMBOLS 1...Casing, 2...Driving device, 3...Earth auger, 3a...Driving device, 3b...Auger screw, 4...Motor, 5...Reducer, 6...
...chuck device, 7 ... base machine, 8 ... leader mast, 10 ... mount, 11 ... outrigger, 12 ... leader mast, 12a ... leader,
13...Casing drive device, 13a...Output shaft, 14...Chuck device, 14a...Chuck cylinder, 15...Lifting jack, 16...
Torque receiver, 17... Drive device for screw, 1
7a... Output shaft, 18... Auger screw, 1
9... Lifting jack, 20... Engaging portion, 20a...
...Engagement groove, 21...Casing.

Claims (1)

[Claims] 1. A short leader mast is erected on a pedestal with outriggers, and a casing drive device is installed along the leader of this leader mast so that it can be raised and lowered freely, and this casing drive device can be moved up and down on the pedestal by means of a lifting jack. The casing drive unit is movably supported, and on this casing drive unit, a torque receiver with two pillars with a gap between them is erected, and the screw drive unit supported by the second elevating jack is attached to the torque receiver. What is claimed is: 1. An excavation device characterized in that the excavation device is suspended from above and placed on the casing drive device by removably engaging the parts.