JPH0454770B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is for providing a continuous wall between vertical holes excavated with a certain gap when constructing a thin continuous underground wall for the purpose of water shielding. This invention relates to a continuous wall excavator that excavates slit-like holes between vertical holes.

[Conventional technology]

Conventionally, as an excavator for continuous walls, for example, one shown in FIG. 10 has been used.

This excavator for continuous walls is suspended by a crane (not shown), and connects the vertical holes 1 by excavating the soil layer 2 between the plurality of vertical holes 1 penetrated through the soil layer.

However, this continuous wall excavator uses an underwater electric motor 3 connected to a ground power source via a cable 3a as a driving source to drive a linear cutter 5 and a rotary cutter 6 via a speed reducer 4. - Soil layer 2 between vertical holes 1 as shown in Figure 11, which is a view taken along line E
excavate.

Here, the rotary cutter 6 excavates in a circular arc 6a shape, and the linear cutter 5 excavates in a rectangular shape 5a.

Therefore, the excavation width 13 of the continuous wall hole portion 14 of the soil layer 2 between the vertical holes 1 is approximately the same as the diameter 13a of the rotary cutter 6, and the continuous excavation width 13 is approximately the same as the diameter 13a of the rotary cutter 6. A wall hole 14 is excavated.

[Problems to be solved by the invention] However, when the purpose is to block water, the excavation width 13 of the continuous wall hole 14 by the above-mentioned conventional device is too thick and unnecessary, and the amount of concrete to be filled is large. ,
The amount of soil excavated and discharged was large, making it uneconomical.

Furthermore, since the cutters 5 and 6 are configured to come into contact with the soil layer 2 due to their own weight, in the case of a hard soil layer 2 or a soil layer 2 of uneven hardness, the cutting reaction force may cause the device to escape. There was a problem that the excavation work did not proceed smoothly.

Therefore, the present invention was proposed to solve the above-mentioned problems.The width of the continuous wall hole between the vertical holes is thin, and the amount of concrete to be filled and the amount of soil to be excavated and discharged is small. The purpose of the present invention is to provide a continuous wall excavator that is economical and has good excavation efficiency.

[Means for solving problems]

The present invention improves a continuous wall excavator that connects a plurality of vertical holes by excavating between the vertical holes suspended by a hanging means and penetrated through the soil layer, and in which the vertical holes are connected. a gripper frame which is vertically movably suspended by the hanging means, is provided in plural pieces radially, and at least one of which is fixed by pressing the inner wall of the vertical hole by extending radially; and the gripper frame. A machine body provided to be able to move up and down with respect to a frame; This is an excavator for continuous walls, which is characterized by consisting of a disc-shaped disc cutter.

[Effect]

According to the present invention, in order to excavate the soil layer between the vertical holes using a disc cutter attached to the machine body,
The width of the continuous wall hole is thin, and the amount of concrete to be filled and the amount of soil to be excavated and discharged is small, making it economical.

In addition, because the gripper frame extends radially and is fixed by pressing against the inner wall of the vertical hole, even when the disk cutter excavates a hard or uneven soil layer, the device does not escape. Therefore, excavation can proceed smoothly and efficiently.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments with reference to the drawings.

FIG. 1 is an explanatory diagram of a state in which an embodiment of the present invention is applied.

As shown in FIG. 3, the gripper frame 15 constituting this embodiment is installed in a vertical hole 1 by a crane 16, which is a hanging means, with a hanging rod 17 and a rod 3.
3a and 33b so as to be vertically movable, and as shown in FIGS. 2, 3, and 7, a plurality of rings are provided radially around the ring 15a.

This hanging means is not limited to the crane 16, but a tower or the like may also be used.

One of the gripper frames 15 is further extended and contracted from a ring 15a by a hydraulic cylinder 30 shown in FIGS. 2 and 7, and is fixed by pressing the inner wall 20 of the vertical hole 1 when it is extended. be done.

In this embodiment, only one gripper frame 15 is configured to extend radially, but the number thereof is not limited.

As shown in FIG. 3, the upper and lower gripper frames 15 are connected and fixed by rods 33.

The body 21 is provided so as to be vertically movable by sliding a cylindrical guide rod 22 forming an upper and a lower part against a ring 15a of the gripper frame 15.

As shown in FIG. 7, a hydraulic cylinder 23 operated by a hydraulic unit on the ground is provided between the fuselage 21 and the ring 15a of the gripper frame 15.

The body 21 is slid up and down with respect to the gripper frame 15 by expansion and contraction of the hydraulic cylinder 23.

The disc-shaped disc cutter 25 is shown in Fig. 2 and Fig. 5.
As shown in FIG. 6 and FIG. 6, it is installed in the frame 35 of the fuselage 21 via a bearing 36 so as to rotate in the vertical direction, and this rotation causes the soil layer 2 between the vertical holes 1 to be Excavate with cutter 34.

Note that the rotation axis of the disk cutter 25 is the
It is provided so as to be located eccentrically with respect to the vertical center line of the first part.

This bearing 36 is sealed with a sealing material 37, as shown in FIG. 6, to prevent dust from entering.

As shown in FIG. 3, the rotation of the hydraulic motor 27 connected to the hydraulic unit on the ground is
The disc cutter 25 is rotationally driven via a gear 31 shown in FIG.

Next, the operation of this embodiment will be explained.

First, as shown in FIGS. 2 and 3, the hydraulic cylinder 23 is in a retracted state, that is, the machine body 21 is at the uppermost position with respect to the gripper frame 15, and the gripper frame 15 is moved by the hydraulic cylinder 30. It is radially expanded and fixed by pressing the inner wall 20 of the vertical hole 1.

In this state, the disc cutter 25 is rotated to gradually extend the hydraulic cylinder 23.

Due to this extension of the hydraulic cylinder 23, the machine body 21 slides downward relative to the gripper frame 15, and the soil layer 2 between the vertical holes 1 is excavated by the disc cutter 25.

The disk cutter 25 is stopped when the machine body 21 is located at the lowest position with respect to the gripper frame 15.

Next, the hydraulic cylinder 30 is retracted to separate the gripper frame 15 from the inner wall 20 of the vertical hole 1,
Furthermore, the hydraulic cylinder 23 is similarly retracted, and the second
As shown in FIGS. 3 and 3, the body 21 is returned to the uppermost position relative to the gripper frame 15.

Furthermore, the hanging rod 17 is lowered by the crane 16, and the gripper frame 15 and the fuselage 21 are lowered.
The whole body is lowered, and in this lowered position, the gripper frame 15 is again radially extended by the hydraulic cylinder 30 and fixed by pressing against the inner wall 20 of the vertical hole 1, and the above-mentioned process is repeated to perform excavation. Let it proceed.

As a result, as shown in FIG. 8, the excavation width 13b of the continuous wall hole 14 has become much thinner than the excavation width 13 by the conventional apparatus shown in FIG. 9 and FIG. 10.

The excavated earth and sand is discharged by a slurry pump 38 or a club bucket as shown in FIG.

〔Effect of the invention〕

As explained above, the present invention excavates the soil layer between the vertical holes using a disk cutter attached to the machine body, so the width of the continuous wall hole is thin, and the amount of concrete to be filled and the amount of concrete excavated and discharged are small. It requires less soil and is economical.

In addition, because the gripper frame extends radially and is fixed by pressing against the inner wall of the vertical hole, even when the disk cutter excavates a hard or uneven soil layer, the device does not escape. This has the effect that excavation can proceed smoothly and efficiently.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a state in which an embodiment of the present invention is applied, FIG. 2 is an enlarged view, and FIG. 3 is an A--
A-line arrow view, Figure 4 is a partially enlarged view, Figure 5 is a second view.
6 is a partial side view of FIG. 5, FIG. 7 is a partial plan view, FIG. 8 is a plan view of the continuous wall hole according to this embodiment, and FIG. 9 is a view taken along line B-B in the figure. 10 is an explanatory diagram of the conventional device, and FIG. 11 is a view taken along the line E--E in FIG. 10. 1... vertical hole, 2... soil layer, 15... gripper frame, 20... inner wall, 21... fuselage, 25...
...Disc cutter.

Claims (1)

[Scope of Claims] 1. A connecting wall excavator that connects a plurality of vertical holes by excavating between the vertical holes that are suspended by a hanging means and penetrated through a soil layer, comprising: A gripper frame that is suspended by a hanging means so as to be movable up and down, is provided in plural pieces radially, and at least one of the gripper frames is fixed by pressing the inner wall of the vertical hole by extending radially; and the gripper frame. A machine body installed on the machine body to be able to move up and down against the machine body, and excavating between the vertical holes by rotating in the vertical direction, the rotating shaft being located eccentrically with respect to the vertical center line of the machine body. An excavator for continuous walls, characterized by comprising a disc-shaped disc cutter.