JPS60105717A - Underground continuous groove excavator - Google Patents

Abstract

PURPOSE:To offset reaction torque produced along with excavation and to maintain torque balance, by a method wherein rotation and revolution excavating devices are disposed in juxtaposition with each other to the lower part of an excavator, and the one of the rotation directions thereof is extended in a reverse direction to that of the other. CONSTITUTION:Plural rotation and revolution excavators 32-38 are positioned in juxtaposition with each other to the lower part of an excavator, bits 32b, revolving in the same direction as that of revolution, are respectively coupled to the rotation and revolution excavators 32-38, and the rotation direction of the rotation and revolution excavators 32 and 38 is extended in a reverse direction to that of the rotation and revolution escavators 34 and 36. This causes the bit 32b to revolve in the same direction as that of rotation, resulting in the possibility to efficiently excavate even hard bedrock. The one of the rotation and revolution excavators 32 and 38 located on the outer side is turned in a reverse direction to that of the other to offset reaction torque. Further, the one of rotation and revolution excavators 34 and 36 on the inner side and the one of roller cutters 50 on both sides is turned in a reverse direction to that of the other, resulting in offset of the reaction torque.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underground trench excavation device, and more particularly to an underground trench excavation device suitable for forming an underground continuous wall in hard rock.

Underground continuous walls for buildings and underground continuous walls for storage tanks for petroleum, LNG, etc. are formed by continuously drilling approximately elliptical boreholes. Drilling equipment for excavating this underground continuous wall borehole has been proposed in the past. For example, as shown in FIG. 1, a continuous wall drilling device 10 is suspended from the ground by wires 12, and bits 16 and 18 are placed at the bottom of the continuous wall drilling device 10 with a center bit 14 in between.
．． 20.22 is provided. These bits 14 to 22 are arranged one above the other so that their drilling holes partially overlap each other. Also, the outermost biy l・16
and bit 22 are rotated in opposite directions to cancel out the excavation reaction torque, and in the same way, the inner bits 18 and 20 are rotated in opposite directions to cancel out the digging reaction torque. 20 is designed to offset the reaction torque received during excavation.

However, since the bits 16, 18, 20, and 22 of the continuous underground trench drilling equipment shown in Figure 1 are drag bits, they are not suitable for excavating and forming continuous walls underground where hard rock exists. There wasn't. That is, in the excavation method using a drag bit, the cutting edges arranged in the diametrical direction of the bit are the same on the same circumference! In order to rotary excavate the 1ft trace,
There is an extreme difference in the speed of the cutting edge at the center of rotation and at the outer periphery, making it impossible to obtain the appropriate cutting speed for the stratum to be excavated, resulting in poor excavation performance, long excavation times, and wear and tear on the cutting edge.
This had the drawback of causing damage and significantly reducing excavation efficiency.

The present invention has been made in view of these circumstances, and proposes a continuous pond trench excavation device that can excavate even hard rock with high efficiency and easily excavate continuous underground walls even in places where hard rock exists. It is intended to.

In order to achieve the above object, the present invention installs a plurality of revolving drilling equipment in a straight line and at symmetrical positions with respect to the center of the drilling equipment main body at the lower part of the drilling equipment main body suspended from the ground. The drilling equipment has bits 1- arranged so that the circular drilling holes are partially overlapped, and a rotary drive source so that the bits constituting the rotation-revolution drilling equipment revolve in the same direction as the rotation. The rotary and revolving excavators that are connected and arranged in parallel are characterized in that their rotation directions are opposite to each other, so that the excavation reaction torques of the revolving and revolving excavators are offset.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the continuous underground trench excavation apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a front view showing the external shape of this embodiment, and FIG. 3 is a bottom view taken along the line ■-■ in FIG.

In FIG. 2, the excavator main body 24 is suspended from the ground via a wire rope 26. The excavation equipment main body 24 includes motors 28 and 28 for driving the rotation/revolution bit, a reduction gear case 30 for the rotation/revolution bit, an interlocking gear case 31 for rotation/revolution rotation, and further linearly arranged symmetrical positions with respect to the center of the excavation equipment main body. Rotating drilling equipment installed in parallel 32.34.3
6.38 is provided. The revolving excavator 32 includes a revolving case 32a and bits 32b, 32b, and 32b supported by the revolving case 32a.

The revolving drilling device 32 has a revolving case 32a and a bi-no-I.
32b rotates in the same direction, so the bit 32b revolves in the same direction as the rotation direction. This is the rotational drilling equipment 3
2 has been explained, but the rotation-revolution drilling equipment 34.
36.38 is similarly configured.

In addition, as shown in FIG. 3, the rotation directions of the outer revolving excavators 32 and 38 are opposite to each other so that the excavation reaction torque is canceled out.
The directions of rotation are also opposite to each other so that the excavation reaction torque is canceled out. Furthermore, the bits of the rotation-revolution drilling devices 32 to 38 are arranged so that their drilling holes partially overlap. The rotational power of the motor 28 is transmitted through the gear transmission means in the gear case 30.31, and the rotation and revolution drilling devices 32 and 38 are forced to rotate on their own axis and revolve, so that their drilling holes partially overlap. Even if two bits and two bits are arranged, each bit rotates in synchronization, so there is no possibility that the bits will interfere with each other.

Further, a reverse pipe 40 is disposed vertically in the center of the excavation equipment main body 24, and the lower end of this reverse pipe 40 is formed into a double pipe structure consisting of an inner pipe 42 and an outer pipe 44. There is. A cutter 42 is attached to the lower edge of the inner tube 42 and the outer tube 44.
a, 44a is formed and excavates the remaining portion between the rotation and revolution excavation devices 34 and 36. Moreover, the inner tube 42 and the outer tube 44 rotate in opposite directions to cancel out the excavation reaction torque.

In FIG. 2, 46 is a motor for driving a roller cutter mounted on the main body 24 of the apparatus, 48 is a reduction gear case for the roller cutter, and 50 is a roller cutter provided on both sides of the main body 24 of the apparatus. The roller cutter 50 is a rotary excavator 3
2 to 38, the remaining portions on the sides that are not excavated by the inner pipe 42 and outer pipe 44 are excavated.

In FIG. 2, 52 is a fixed guide, 54 is an adjustable guide that operates back and forth, 56 is an adjustable guide that operates left and right, and 58 and 59 are hydraulic units for the adjustable guides 54 and 56.

The operation of the embodiment according to the present invention constructed as described above is as follows.

First, the rotational force of the motor 28.28 is applied to the gear case 30.3.
Rotating drilling equipment 32 to 38 through gear transmission device 1
, is transmitted to the reverse pipe 40.

In this case, since the bit 32b of the rotation-revolution drilling device 32 revolves in the same direction as the rotation direction, the locus drawn by the teeth of the bit 32b is an ebitrochoid trajectory that moves the circle 60 of FIG. Hole 62 corresponds to the envelope of circle 60 . Therefore, even hard rock can be excavated efficiently using the milling method. Excavating can be performed in exactly the same manner with other rotation-revolution excavation devices 34, 36, and 38.

According to the embodiment, the outer rotational drilling device 32.38
As shown in FIG. 3, the excavators 34 and 36 rotate in opposite directions to cancel out the reaction torque, and the inner revolution-revolution excavators 34 and 36 similarly rotate to cancel out the reaction torque. Furthermore, the inner tube 42 and outer tube 44 of the reverse tube 40 rotate in opposite directions to cancel out the reaction torque, and the roller cutters 50 on both sides rotate in opposite directions.
However, by reversing the direction of rotation, the reaction torque can be canceled out. In this way, in this embodiment, torque balance is maintained for the entire excavation apparatus. Therefore, in the embodiment, the revolving and revolving excavators 32 to 38, the reverse pipe 40
When excavating with the roller cutter 50, an oval excavation hole shown in FIG. 3 can be excavated with high accuracy.

As explained above, according to the continuous underground trench excavation device according to the present invention, the directions of rotation and revolution of the excavation device body are the same t[
Since the rotary and revolving excavators are arranged in a straight line, continuous walls can be easily and efficiently excavated even in hard rock layers.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional continuous underground trench excavation device, Fig. 2 is a front view of the present embodiment, Fig. 3 is a bottom view taken along the If-II line in Fig. 2, and Fig. 4 is an It is an explanatory view showing the locus of teeth of a revolving excavation device. 24...Drilling equipment body, 26...Wire robe, 2
8...Rotating and revolving drilling equipment drive motor, 3o, 31...
Gear case, 32 to 38... Rotating drilling equipment, 4
0... Reverse pipe, 42... Inner pipe, 44... Outer pipe, 46... Roller cutter drive motor, 48... Gear case for roller cutter, 50... Roller cutter. Agent: Patent Attorney Kenzo MatsuuraContinued from page 10 Author: Yasuhiro Taka Meguro, Meguro-ku, Tokyo0 Author: Tadao Takahashi Meguro, Meguro, Tokyo

Claims (3)

[Claims] (1) A plurality of revolving drilling rigs are arranged in a straight line at the bottom of the drilling rig body suspended from the ground and in symmetrical positions with respect to the center of the drilling rig body, and each of the orbiting drilling rigs has a circular drilling hole. The pits 1- are arranged so that they partially overlap, and the bits constituting the rotation-revolution excavation device are connected to a rotational drive source so as to revolve in the same direction as the rotation, and the By reversing the rotation directions of the revolving drilling rigs, the excavation reaction of the revolving drilling rigs is reduced.
An underground continuous trench excavation device characterized by the fact that the torque is offset. (2) A reverse pipe is placed in the center of the excavation equipment body, and the tip of the reverse pipe has a double structure of an inner pipe with a cutter part and an outer pipe. 2. The continuous underground trench excavation device according to claim 1, wherein the excavation reaction torques are canceled by rotating in opposite directions to each other. (3) Roller cutters are installed on both sides of the excavation equipment body, and each roller cutter is driven by a motor separate from the revolution drilling equipment and the rehearsing motor drive, and is connected to the revolution drilling equipment and the reverse pipe. An underground continuous trench excavation device according to claim (1), characterized in that the excavation remaining portion is excavated and the excavation reaction torque is canceled by mutually rotating in opposite directions.