JPH03115617A - Excavator of ground inside caisson - Google Patents

Abstract

PURPOSE:To certainly excavate ground inside a caisson by providing the first and the second excavators on the lower side of a caisson body and excavating the central part of the ground and the ground at the blade edge part of the caisson body. CONSTITUTION:Upper and lower guide rails are continually set in the circumferential direction on the lower side part of an inwall 2 of a caisson body 1. Then, excavator main bodies 6, 7 of the first and the second excavators 4, 5 are provided free to move along the upper and the lower guide rails 3. And then, the ground Al in the central part is excavated with an excavation blade 12 provided on the first excavator 5. Additionally, a bucket 20 is provided on the second excavator 5 and the ground A2 at the cutting edge part of the caisson body 1 is excavated and transported to the central part. Furthermore, the earth transported to and accumulated on the ground Al in the center is discharged onto the ground surface with a clamshell.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for excavating the internal ground of a caisson.

[Conventional technology]

Install a circular rail along the lower part of the inner wall of the caisson frame,
An excavator is movably installed along this annular rail, and the excavator excavates the ground at the mouth of the caisson frame.

This device extracts reaction force from the inner wall of the caisson frame, has girders in the radial direction, and has an arm extending from the center to excavate the ground at the mouth of the caisson frame and the ground in the center.

A device that excavates from the ground surface using a clamshell.

[Problem to be solved by the invention]

The first device cannot excavate the ground in the center.

In the second device, as the diameter of the caisson increases, supporting structural members such as girders and arms become larger, resulting in higher costs.

The third device not only cannot excavate the ground at the mouth of the caisson frame, but also has weak excavating power and cannot excavate hard ground.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an excavation device for excavating the ground inside a caisson, which can solve the above-mentioned problems.

[Means and actions for solving the problem] First and second excavators are provided at the lower part of the inner wall of the caisson frame, the first excavator excavates the ground in the center, and the second excavator excavates the cutting edge of the caisson frame. The ground was excavated so that it could be transported to the central area.

〔Example〕

As shown in FIG. 1, upper and lower guide rails 3, 3 are installed continuously in the circumferential direction at the lower part of the inner wall 2 of the caisson frame 1, and the first and second excavators 4.5
The excavator main body 6°7 is movably provided.

The first excavator 4 is provided with a boom 8 and an arm 9 on an excavator body 6 so as to be swingable up and down with a boom cylinder 10 and an arm cylinder 11, and an excavation blade 12 is provided on the tip of the arm with a cylinder 13 so as to be swingable up and down. This allows the excavation blade 12 to excavate the ground A1 in the center.

The second i1iii excavator 5 has first and second excavator main body 7.
- The third arm 14, 15.16 is attached to the first, second and third arm cylinders 17, 18, 19 so as to be able to swing up and down, and the packet 20 is attached to the tip of the third arm 16 so that it can swing up and down with the packet cylinder 21. By attaching it freely, the packet 20 can be swung from the side of the caisson frame 1 toward the center, thereby making it possible to excavate the ground A2 at the mouth of the caisson frame and transport it to the center.

Then, as shown in FIG. 2(a), the ground A1 in the center is excavated, for example, ripped, using the excavation blade 12 of the first excavator 4 to weaken it.

After this, as shown in Fig. 2(b), the ground A2 at the tip of the caisson is excavated by the packet 20 of the second excavator 5, transported to the ground A in the center and piled up, and then discharged to the ground surface with a clamshell. Soil.

FIG. 3 shows a second embodiment, in which a packet 22 is attached to the tip of the arm 9 of the first excavator 4 so as to be able to swing up and down with a packet cylinder 23, and as shown in FIG. As shown in Fig. 4(b), the ground A2 at the cutting edge of the caisson frame is excavated using the packet 20 of the second excavator 5, and the clamshell is piled up in the center. The soil will be discharged to the ground surface.

In the above embodiment, the first and second excavators 4.5 are movable along the guide rails, but they may be directly attached to the inner wall 2.

〔Effect of the invention〕

The first excavator 4 can excavate the ground A in the central part, and the second excavator 5 can excavate the ground A2 at the tip of the caisson frame and transport it to the central part, so that the ground inside the caisson can be reliably excavated.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, and FIG.
), (b) are explanatory diagrams of the excavation operation, FIG. 3 is a sectional view showing the second embodiment, and FIGS. 4(a) and (b) are explanatory diagrams of the excavation operation. 1 is the caisson frame, 2 is the inner wall, 4 is the first excavator, and 5 is the second excavator.

Claims (1)

[Claims] At the bottom of the interior 2 of the caisson frame 1, there is ground A_1 in the center.
The first excavator 4 excavating the ground A at the cutting edge of the caisson frame
A device for excavating the ground inside a caisson, characterized in that it is provided with a second excavator 5 for excavating _2 and transporting it to the central part.