JPH03132584A - Boring device - Google Patents

Abstract

PURPOSE:To discharge excavated earth directly to the surface of the earth while the excavation is being made by a double screw by anarizing an inner screw inside an outer casing, and by connecting thereto the lower end of an inner rod that is contained inside an outer screw. CONSTITUTION:To the upper part of a cylindrical outer casing 20 that is equipped with an excavating means and earth discharging ports 22, a hollow outer screw 30 is integrally connected which has spiral blades 32 provided on its peripheral face and designed to convey the excavated earth 70 and 70 upward along a bore wall 80 after being discharged through the earth- discharging ports 22. An inner screw 40 equipped with the excavating means is rotatably wranged in the outer casing 20, and to the upper end of the inner screw 40, the lower end of an inner rod 50 contained inside the outer screw 30 is integrally connected. Then torque is transmitted independently to the inner screw 40 and the outer casing 20. The excavated earth 70 and 70 are directly discharged to the surface of the earth while the excavation is made with a double screw.

Description

[Detailed Description of the Invention] <Industry> Second Field of Application><PriorArt> As a drilling device used in the earth-organizing method, rotary drilling is performed with an auger screw while suppressing collapse of the ground with a casing. Drilling devices of this type are widely known.

Furthermore, drilling devices are also known in which special bits are attached to the casing head or auger head depending on the geology.

Most conventional drilling equipment has a structure in which the excavated soil is guided inside the casing by the spiral blades of the auger screw, and is finally discharged from the soil discharge port opened at the topmost gauging. There is.

<Problems to be solved by the present invention> Conventional drilling equipment has the following problems.

<B> As the excavated earth and sand falls to the ground, the safety of workers is threatened.

<Enterprise> Since a casing is required over the entire length of the drilled hole, handling, assembly, and removal of the casing requires a great deal of effort.

This is a drilling device configured to transmit light force.

<Object of the present invention> The present invention was made to solve the following two problems, and its purpose is to facilitate the processing of excavated soil, ensure the safety of the working environment, and improve the working environment. An object of the present invention is to provide a drilling device that can promote efficiency.

<Means for Solving the Problems> That is, the present invention has a cylindrical outer casing provided with an excavating means and an earth discharge port, and has spiral blades on the circumferential surface at the upper part of the outer casing. A hollow outer screw for transferring excavated soil discharged from the mouth to and from the hole wall is integrally connected, an inner screw having a digging means is rotatably housed in the outer casing, and an upper end of the inner screw The lower end of an inner rod into which an outer screw is inserted is integrally connected to the inner rod, and the inner rod and the outer casing are rotated independently.

<A> Hole drilling device Figure 1 shows an overall view of the drilling device.

10 is a base machine with a traveling function, 11 is a beam 1
It is an orca machine hanging from 2.

The drilling device according to the present invention includes a special structure double screw,
That is, an outer casing 20, an outer screw 30 integrated with the outer casing 20, an inner screw 40 rotatably housed in the outer casing 20, and an inner screw 4.
0 and an integral inner rod 50.

Each part will be explained in detail below.

<Port> Outer casing A cross-sectional view of the outer casing 20 is shown in FIG. 2, and a perspective view of the upper half thereof is shown in FIG. 3.

The outer casing 20 is made of a steel pipe having a certain length, has a casing head 21 at its lower end with a number of bits, and has an earth discharge port 22 at its upper end on an inclined circumferential surface.

The outer casing 20 is not particularly expected to have the function of suppressing collapse of the hole wall as in the conventional case.

<C> Outer screw The outer screw 30 is a member for transmitting rotation to the outer casing 20 and transporting excavated soil to the ground, and is configured by providing a spiral blade 32 on the circumferential surface of a hollow cylindrical body 31. be done.

Therefore, the diameter of the blades 32 does not exceed the diameter of the outer casing 20.

(2) Inner Screw - As shown in FIG. 2, the inner screw 40 has a spiral blade 42 on the circumferential surface of a rod 41, and a bit 43 at the lower end.

The formation range of the blades 42 is set to be approximately equal to the entire length of the outer casing 20, and the diameter of the blades 42 does not exceed the inner diameter of the outer casing 20.

In the present invention, a case will be described in which the blades 32.42 of the outer screw 30 and the inner screw 40 are oriented in opposite directions, but the blades 32.42 may be oriented in the same direction.

<E> Inner rod The inner rod 50 is a rod that passes through the outer screw 30 and transmits rotation to the inner screw 40.

Like the outer screw 30, the inner rod 50 is constructed to have a fixed length and can be attached or detached to adjust its overall length.

<Effect> Next, a drilling method using a drilling device will be explained.

<A> Drilling As shown in FIG. 1, the upper part of the inner rod 50 integrated with the inner screw 40 and the upper part of the outer screw 30 integrated with the outer casing 20 are respectively gripped by the auger machine 12,
Drilling is started by applying rotation in the opposite direction to each member.

<Exit> Soil removal As shown in FIG. 2, the excavated earth 70 excavated by the inner screw 4o and the outer casing 20 is sent upwards by the blades 42 inside the outer casing 20, and is then sent to the earth discharge port of the outer casing 20. 22 and above the outer casing 20.

The excavated earth 7o pushed out of the outer casing 20 forms the hole wall 80.
It is transported to the ground by the outer screw 30 while diffusion is suppressed.

In addition, since the excavated soil 70 is holding down the hole wall 8o, the excavated soil 70
There is no fear that the hole wall 80 will collapse during the transfer of zero.

When the excavated soil 70 is transported to the ground, it loses the member (hole wall 80) that suppresses diffusion, so it is sequentially released onto the ground.

In addition, when drilling in hard ground such as giant boulders or rock, the inner screw 40 should be drilled in advance using the outer casing 20.
If you drill a hole with this, you will be able to drill a hole with high precision.

In addition to providing the soil discharge port 22 at the top of the outer casing 20, if a plurality of soil discharge ports are arranged vertically and opened on the circumferential surface of the cylindrical portion, it is possible to remove soil during initial excavation. There is an advantage that soil can be removed from a low position of the outer casing 20.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

<B> Although drilling is performed using a double screw, the excavated soil can be directly discharged from inside the hole to the ground surface.

Therefore, the working environment can be significantly improved compared to conventional equipment that drops excavated soil from above.

<Mouth> The high vertical accuracy of the double screw is not compromised.

<C> Since earth excavation effectively suppresses the collapse of the hole wall, the hole can be drilled with high precision even without a continuous casing.

[Brief explanation of the drawing]

Fig. 1 Overall diagram of the drilling device according to the present invention Fig. 2: Partial sectional view of the drilling part

Claims (1)

[Claims] (1) A cylindrical outer casing equipped with an excavation means and a soil discharge port has a spiral blade on its circumferential surface, which allows the excavated soil discharged from the soil discharge port of the outer casing to be connected to the hole wall. A hollow outer screw to be transferred between the two is integrally connected, an inner screw having a digging means is rotatably housed in the outer casing, and an upper end of the inner screw has a lower end of an inner rod with an outer screw inserted therein. A hole drilling device configured to be configured such that rotational force can be transmitted independently to the inner screw and the outer casing.