JPH0477116B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an excavating and removing device used in pile hole excavation 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 inventor previously invented the following excavation device as an improvement of this casing auger construction method. This is done by casing 1 as shown in Figure 5.
It consists of a drive device 2 that presses the casing 1 into the ground while rotating it, and an earth auger 3 that is suspended from above into the casing 1 as a means for excavating and removing earth within the casing 1.

The drive device 2 is composed of a motor 4, a reducer 5 connected to the motor 4, and a chuck device 6 connected to the casing outer periphery connected to the reducer 5. It is donut-shaped with a through hole.

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 able to rise and fall.

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 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 drilling equipment shown in FIG. 5 is used, the casing 1 and the auger screw 3b can be rotated in opposite directions, and the preceding excavation position of either the casing 1 or the auger screw 3b can be made to be different. This allows for more effective excavation compared to the conventional casing auger method.

[Problem to be solved by the invention]

However, even with the drilling equipment shown in Figure 5 above, the
When the depth reaches a depth of about 70m, Earth Auger 3
Since the length of the auger screw increases and the weight increases, a large-scale work is required to pull out the auger screw.

On the other hand, it is also conceivable to suspend a hammer grab or the like into the casing 1 instead of the auger screw 3b and use this to excavate and remove the soil.

However, these excavating means such as hammer grabs are extremely inefficient for excavating at great depths as described above, since the amount of soil removed by one drop is small.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
The inside of the casing can be efficiently excavated and removed at once, and it is easy and reliable to take it in and out of the casing, so it has good workability even at great depths. Furthermore, the excavation and removal means for doing this is a casing that rotates with its rotational torque. An object of the present invention is to provide an excavating and unloading device that is inexpensive and easy to handle because it can be obtained directly from the soil without requiring a special drive mechanism.

[Means to solve the problem]

In order to achieve the above object, the present invention comprises a casing that is rotated and inserted into the ground, and an excavation and removal means that is suspended into the casing. The cylinder is provided with a chuck device that allows the lateral pressing member to protrude, the lower end of this chuck device is connected to a rotation transmitter via a drive shaft, and the output shaft of the rotation transmitter has a bit at the tip. The gist is that an excavating screw provided with a head is connected, and a guide tube located outside the excavating screw and having a smaller diameter than the casing is provided at the lower part of the case of the rotation transmitter.

[Effect]

According to the present invention, if the excavating and unloading means is suspended with the pressing member of the chuck device retracted into the casing, and the chuck device is extended, it is fixed to the inner circumferential surface of the casing at this portion. When integrated, the guide pipe and drilling screw protrude from the lower end of the casing.

When the casing rotates, the excavation screw also rotates in the opposite direction via the chuck device and rotation transmission device, and is inserted into the ground. It is inserted and earth pressure (adhesive force) is applied to the outer peripheral surface in contact with the ground.

As a result, this guide pipe remains stationary in the ground, and the rotation transmitter also remains stationary, so the excavation screw can excavate earth and sand while absorbing the rotational reaction force in the guide pipe, and the excavated earth and sand It is compacted and taken in in large quantities into the guide tube.

When the guide pipe is filled with compacted earth and sand, the chuck device is loosened, the entire excavation and earth removal means is pulled up from the casing, and the earth and sand in the guide pipe is discharged to the ground.

〔Example〕

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

FIG. 1 is a longitudinal sectional front view of a main part of an embodiment of the excavating and unloading apparatus of the present invention, and FIGS. 2 to 4 are longitudinal sectional front views illustrating each process in a state of use.

In the figure, 1 is a casing, and as shown in FIG. The reducer 5 and the chuck device 6 are donut-shaped and have a through hole through which the excavation casing passes through the center.

Although the illustration of the drive device 2 itself is omitted, it is connected to a base machine having a moving mechanism such as a crawler, or a leader of a short leader mast installed upright on a frame with wheels, etc., so that it can be raised and lowered from the side. It is equipped with a joke.

In the figure, reference numeral 9 denotes an excavating and unloading means that is set in the casing 1 by suspending it from the upper end opening of the casing 1. This is a chuck device in which a pressing member 11a can be protruded laterally by a cylinder 10 provided inside. 11 is provided at the top, the lower end of this chuck device 11 is connected to a rotation transmitter 13 via a drive shaft 12, and the output shaft 13a of the rotation transmitter 13 is further provided with a drilling head having a bit at the tip. 14 are connected. In the figure, reference numeral 13b denotes a transmission gear constituting the rotation transmission device 13, and due to this gear ratio, the rotation transmission device 13 has a role as a speed reducer. In the figure, 13c is a case for external protection, and the case 13c is attached to the lower surface of the chuck device 11 via a swivel 15.

Further, a guide tube 16 having a slightly smaller diameter and a relatively shorter length than the casing 1 is provided on the lower surface of the rotation transmitter case 13c.

Such a chuck device 11 and rotation transmitter 13
and an excavating earth removal means 9 consisting of an excavating screw 14
is suspended by a crane or the like using a hanging hook 17 provided at the center of the upper surface of the chuck device 11, and is lowered into the casing 1 with the pressing member 11a of the chuck device 11 retracted. Then, at a position where the guide pipe 16 and the excavation screw 14 protrude from the lower end of the casing 1 by an appropriate length, the cylinder 10 projects the pressing member 11a and presses it against the inner circumferential surface of the casing 1. The excavation and removal means 9 is the casing 1.
Fixed. The rotation transmitter 13 is equipped with a transmission gear 13b so as to convert the rotation of the chuck device 11 fixed to the casing 1 into rotation in the opposite direction and transmit the rotation to the excavation screw 14.

Next, usage and operation will be explained.

In order to erect the casing 1, the casing 1 is rotated by a drive device 2 and press-fitted into the ground. In addition, the excavating and unloading means 9 is suspended into the casing 1 from the upper end opening of the casing 1, and the chuck device 1 is removed.
1 as described above.

When the casing 1 is rotated by the drive device 2, the drilling screw 14 is rotated via the rotation transmitter 13.
This casing 1 is also rotated in the opposite direction to excavate the ground inside the casing 1.

At this time, the guide tube 16 also protrudes from the tip of the casing 1 and is press-fitted into the ground, but earth pressure acts on its outer surface, and the guide tube 16 is inserted in a stationary state without rotation due to the adhesive force of the soil. The excavating screw 14, which receives rotational torque from the casing 1, can use the guide pipe 16 as a reaction force during its rotation, so it is not necessary to apply a large load to the chuck device 11, and the rotational torque of the casing 1 is not forced. It can be transmitted to the excavation screw 14 without any problem.

Further, the earth and sand excavated by the excavation screw 14 is taken into the guide pipe 16;
Since its upper end is closed by the rotation transmitter case 13c, it is compressed in the guide tube 16 sequentially from the top.

When the ground is excavated in this way and the inside of the guide pipe 16 is filled with earth and sand, the chuck device 1
1 is released, the excavating and unloading means 9 is pulled upward from the casing 1, and the earth is unloaded on the ground.

(Effects of the Invention) As described above, the excavating and unloading device of the present invention efficiently excavates and unloads a large amount of earth and sand at once by rotating the excavating screw and compactly storing the excavated earth and sand in the guide pipe. This makes it ideal for drilling deep holes.

In addition, the rotational torque of the casing can be used to rotate the excavation screw for excavating and removing soil.
A special drive device for driving the excavation screw is not required, making it inexpensive and simple.

Furthermore, there is no need for hydraulic hoses or power cables to drive the excavation screw, making it easy to handle.

Moreover, the reaction force of the rotation of the excavation screw can be obtained by using the adhesive force of the hard ground, and powerful rotational torque is efficiently transmitted without applying excessive force to the joint between the excavation screw and the casing. This provides digging power.

At this time, the chuck device can be moved in and out of the casing simply by expanding and contracting the internal cylinder, so it is easy to operate and the device itself can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the main part showing one embodiment of the excavating earth removal device of the present invention, Figs. 2 to 4 are longitudinal sectional front views showing each process in the same state of use, and Fig. 5 is a conventional It is a side view which shows an example. 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, 9...Excavation and removal means, 10...Cylinder, 11...Chuck device, 11a...Press member, 12...Drive shaft, 13... Rotation transmitter, 13
a...Output shaft, 13b...Transmission gear, 13c...
Case, 14...Drilling screw, 15...Swivel, 16...Guide pipe, 17...Hook for hanging.

Claims (1)

[Claims] 1 Consists of a casing that rotates and is inserted into the ground, and an excavating and unloading means that is suspended into the casing. The lower end of the chuck device is connected to a rotation transmitter via a drive shaft, and the output shaft of the rotation transmitter is connected to a drilling screw provided with a drilling head having a bit at the tip. An excavating and unloading device comprising: a guide pipe located outside the excavating screw and having a smaller diameter than the casing at the lower part of the case of the rotation transmitter.