JPH04221125A - Digging apparatus for caisson internal ground - Google Patents

Abstract

PURPOSE:To enable digging from the central portion of the caisson internal ground to a portion corresponding to a caisson cutting edge portion and to prevent run-out motion of a clamshell. CONSTITUTION:Plural supporting pieces 6 are radially provided in such a manner as to go in and out on the upper portion of a guide pipe 1 to form an upper supporting mechanism, and plural supporting pieces 11 are radially provided in such a manner as to go in and out on the lower portion of the guide pipe to form a lower supporting portion 3. A rotor 13 is installed in such a manner as to be turned round the pipe 1 below the lower supporting mechanism 3. The caisson internal ground is dug with a digging edge portion 15 radially fitted on the lower surface of the rotor 13 by the turning of the rotor 13. The dug sediment is scraped up to the central portion by a scraping plate 16. The scraped-up sediment can be discharged to the outside of a caisson by a clamshell 28 adapted to move up and down by the guide pipe 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for excavating the internal ground of a caisson.

0002

[Prior Art] As shown in Japanese Patent Publication No. 60-22132, a circumferentially extending rail is provided on the inner wall of the lower part of the caisson frame, and a bucket type excavator is movably provided along the rail to perform excavation. A device that sequentially excavates the ground inside a caisson using a machine.

[0003] A device for excavating the internal ground of a caisson using a clamshell from the ground surface. etc. are known.

0004

[Problem to be solved by the invention] In the former type of excavation equipment, the excavation equipment is a bucket type consisting of a boom, an arm, and a bucket, and the boom base moves along a rail provided on the inner wall of the lower part of the caisson frame. If the caisson has a large diameter, the ground in the center of the caisson cannot be excavated unless the boom and arm are lengthened. For this reason, the weight of the excavator increases, and the strength of the support part of the excavator must be increased.
Cost increases.

[0005] The latter type of excavation equipment not only cannot excavate the ground corresponding to the caisson cutting edge, but also may collide with the inner wall of the caisson frame when moving the clamshell up and down, damaging the inner wall.

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.

[0007]

[Means for solving the problem] An upper support mechanism and a lower support mechanism are attached to the upper and lower parts of the guide pipe, and a rotating body having a digging blade and a scraping plate is guided by a rotating mechanism at the lower part of the lower support mechanism. A clamshell that is attached so that it can rotate around the pipe, excavates the ground inside the caisson with the digging blade, scrapes the excavated earth and sand into the center with a scraping plate, and moves the scraped earth and sand up and down along the inside of the guide pipe. It is designed so that it can be discharged to the outside of the caisson.

[0008]

[Example] As shown in FIGS. 1 and 2, an upper support mechanism 2 is provided at the top of the guide pipe 1, and a lower support mechanism 3 is provided at the bottom of the guide pipe 1.
The upper support mechanism 2 has a plurality of hollow support frames 5 radially attached to a ring 4 provided on the outer peripheral surface of the guide pipe 1, and a movable rod 7 provided with a support piece 6 on the support frame 5. is provided in a cylinder 8 that can be freely moved in and out, and the support piece 6 is brought into pressure contact with the inner wall B of the caisson body A.

The lower support mechanism 3 includes upper and lower fixing frames 9 and 10 fixed to the lower part of the guide pipe 1, and a plurality of supporting pieces 11 are provided radially on the upper and lower fixing frames 9 and 10. The support piece 11 is moved in and out of the cylinder 12 and is brought into pressure contact with the inner wall B of the caisson frame A.

A disk-shaped rotating body 13 is provided at the bottom of the lower fixed frame 10 so as to be able to rotate around the guide pipe 1 by a rotating mechanism 14, and a digging blade portion 15 and a scraper are provided on the lower surface of the rotating body 13. A plurality of plates 16 are provided radially.

As shown in FIG. 3, the rotating mechanism 14 includes a thrust bearing 19 and a radial bearing 20 between a ring body 17 provided on the lower fixed frame 10 and an annular recess 18 of the rotating body 13, A ring gear 21 is provided on the peripheral wall of the lower fixed frame 10, and a pinion 23 driven by a motor 22 attached to the lower fixed frame 10 is meshed with the ring gear 21. When the pinion 23 is driven by the motor 22, the rotating body 13 is rotated. It is structured as follows.

As shown in FIGS. 1 and 4, the excavating blade portion 15 is made up of a plurality of blades 25 attached to a blade body 24, and the blade body 24 has grooves 26 radially formed in the rotating body 13.
A cylinder 27 is connected between the blade main body 24 and the rotating body 13, and by expanding and contracting the cylinder 27, the blade main body 24 radiates along the groove 26. It is configured to move in the direction.

The scraping plates 16 are provided radially on the lower surface of the rotating body 13, as shown in FIGS. 2 and 4.

Next, the excavation operation will be explained. When the entire device is installed inside a caisson, each of the supporting pieces 6 and 11 is moved to a smaller size so that it does not come into contact with the inner wall B of the caisson body A, and the excavating blade portion 16 is moved toward the center using a cylinder 27. In this state, it is suspended inside the caisson using a crane or the like, and each support piece 6, 11 is extended at a predetermined position and pressed against the inner wall B of the caisson frame A to support it.

The cylinder 27 moves the excavating blade 16 to the outer periphery to the caisson cutting edge C, and the motor 22 is driven to rotate the rotating body 13 using the pinion 23 and ring gear 21 to rotate the excavating blade 15. The ground inside the caisson is excavated with the blade 25. The excavated earth and sand is moved toward the center of rotation by a raking plate 16 and discharged to the outside of the caisson by a clamshell 28 inserted through the guide pipe 1.

[0016]

Effects of the Invention: A clam shell in which the ground inside the caisson is excavated by the excavating blade part 15, the excavated earth and sand is raked to the center part by the raking plate 16, and the raked earth and sand is moved up and down using the guide pipe 1 as a guide. 28 can be discharged to the outside of the caisson. Therefore, the ground inside the caisson can be excavated from the central part to the part corresponding to the caisson cutting edge part, and since the clamshell 28 is guided by the guide pipe 1 and does not swing, the inner wall of the caisson frame is not damaged.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a caisson internal ground excavation device.

FIG. 2 is a plan view of the caisson internal ground excavation device.

FIG. 3 is a detailed explanatory diagram of the turning mechanism.

FIG. 4 is a perspective view of a rotating body portion.

[Explanation of symbols]

1 Guide pipe, 2 Upper support mechanism, 3 Lower support mechanism, 13 Rotating body, 15 Excavation blade part, 16
Scraping board, 28 clamshell

Claims (1)

[Claims] Claim 1: An upper support mechanism 2 and a lower support mechanism 3 are attached to the upper and lower parts of the guide pipe 1, and a rotating body 13 is attached to the lower part of the lower support mechanism 3 so as to be rotatable by a rotating mechanism 14. A device for excavating ground inside a caisson, characterized in that an excavating blade part 15 and a scraping plate 16 are attached to the lower surface of the caisson, and a clamshell 28 is arranged in the guide pipe 1 so as to be movable up and down.