JPH0633467A - Earth lift device for caisson - Google Patents

Abstract

PURPOSE:To excavate and lift excavated earth with different devices separately and facilitate their management. CONSTITUTION:This earth lift device comprises a caisson 1 provided with a running rail 11 inside the lower past, a crane installed to the upper space of the caisson, an excavator 6 installed in such a fashion that it may move freely in a horizontal direction and a grab 4 which is suspended from the crane so as to grab earth and sand. When the grab is lowered, a falling signal is transmitted to the excavator 6. The excavator 6 which receives this signal, reduces its projection shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson hoisting device.

[0002]

2. Description of the Related Art A caisson is generally sunk by excavating the inside thereof. To this end, a device has been developed in which a crane is located in the upper space of the caisson and an excavator is located inside the caisson to excavate and carry out sediment. In this way, if it is a device that independently excavates earth and sand and carries out earth and sand with another device, excavation efficiency is better than a device that excavates and carries out only by grabs,
As a result, caisson with a large diameter and a large depth can be constructed.

[0003]

However, the caisson as described above has the following problems. In other words, it is extremely important to manage the relationship between the working posture of the excavator placed inside the caisson and the position of the grab that carries out the sediment. If a grab hung at a high speed to grab a large amount of earth and sand extends the arm at the bottom of the caisson and hits the excavator during excavation, both can be damaged. Therefore, the working posture of the excavator and the lowering position of the grab must be taken into consideration at all times. As a result, it is difficult to carry out quick work, and the control of the posture of the excavator becomes extremely troublesome.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a caisson hoisting device in which excavation and hoisting are performed by different devices and the management is extremely easy. The purpose is to

[0005]

That is, according to the present invention, a caisson provided with a traveling rail inside a lower portion, a crane provided in an upper space of the caisson, and a traveling rail provided below the caisson are horizontally movable. It consists of an excavator and a grab that hangs down from a crane and picks up soil.
It is a caisson hoisting device configured to output a descending signal to the excavator when the grab is descending, and the excavator that receives this signal reduces the projected shape.

[0006]

The present invention will be described below with reference to the drawings. <A> Structure of caisson The structure of the caisson 1 itself is the same as the conventionally known one. However, a traveling rail 11 is provided in the circumferential direction inside the lower part of the caisson 1. An excavator 6 to be described later can move horizontally along the inside of the caisson 1 along the traveling rail 11.

<B> Crane Structure The crane 2 is located in the upper space of the caisson 1. The crane 2 can be widely used as a gate type as shown, a cantilever type, a type in which a rotating mechanism is provided in a part of the gate type crane, and other known types.

<C> Grab This crane 2 has a trolley 3 that can move horizontally.
And the glove 4 is hung from the trolley 3. In this way, the glove 4 can be horizontally moved, lowered, rolled up, and discharged by the trolley. Wheels 5 are provided on the legs of the crane 2. On the other hand, around the caisson 1 on the ground, a rail is laid concentrically with the caisson 1. Then, the wheels 5 of the legs of the crane 2 are mounted thereon so that the caisson 1 can freely rotate around the caisson 1. In addition to the wheel 5 and the circular rail,
In some cases, the track and tires may be provided to move the crane by a predetermined amount. In this way, the trolley 3 can be moved in the horizontal direction, and the crane 2 can freely rotate on the annular rail or move a predetermined amount. Therefore, the hanging position of the grab 4 can be freely set inside the caisson 1. The position can be selected.

<D> Excavator 6 As described above, inside the lower part of the caisson 1, the traveling rail 11 is provided horizontally in the circumferential direction. The excavator 6 is mounted on the traveling rail 11 below the caisson 1 so that it can move freely in the circumferential direction. A signal line and a power line are connected to the excavator 6 from the crane 2 at the upper part to instruct the position and perform excavation work.

[0010]

Next, the attitude of the excavator 6 and the management of the work of hoisting the grab 4 will be described. <a> Stopping the excavator 6 First, the down signal from the grab 4 or the excavation stop signal is input to the excavator 6 to stop the excavation work. This signal is
It is input to the drive source of the trolley 3 of the glove 4 via the signal line.

<B> Grab descent and reduction command As a result, the glove 4 moves horizontally and descends toward the inside of the caisson 1 with the blade opening left open. And grab 4
When reaches a position at a certain height from the excavator 6, the descent is stopped. The position of the excavator 6 and the position of the grab 4 at that time can be grasped by the distance of the unwound wire. The grab 4 outputs a reduction command signal to the excavator 6 before the descent or when the descent is stopped.

<C> Reduction of excavator 6 Upon receiving the signal of this reduction command, the shape of the excavator 6 is reduced by pulling back the excavation arm so that the horizontal projection shape is minimized. When the reduction operation is completed, the descent restart signal is output to the drive source of the grab 4.

<D> Descent of the grab 4 and soil dumping The grab 4 which has resumed descent falls to the bottom surface and catches the earth and sand after excavation. Even if the grab 4 descends, there is no risk of collision between the two because the excavator 6 reduces its projected shape on the horizontal plane to the minimum. When you grab the earth and sand, close the blade of grab 4 and move up. When it reaches the crane 2, the ascending is stopped, the trolley 3 is moved to approach the hopper to open it, and the soil is discharged.

[0014]

Since the apparatus of the present invention is as described above, the excavator 6 is reduced to a small projection surface shape during the operation of the grab 4. Therefore, open the excavation surface to the maximum,
There is no risk of the grab 4 colliding with the excavator 6 and being damaged,
The excavation and the application can be performed in parallel at a high speed, and the large depth caisson 1 can be constructed in a short time. Further, since the excavator 6 is reduced to the smallest projection surface shape in accordance with the hoisting operation of the grab 4, a large area for hoisting can be taken and a large glove 4 can be used. Furthermore, since the area where the soil can be pumped is large, the amount of soil that can be pumped once can be increased, and the operation is extremely economical.

[Brief description of drawings]

FIG. 1 is an illustration of an upper embodiment of the device of the present invention.

FIG. 2 is an illustration of a lower embodiment of the device of the invention.

FIG. 3 is an explanatory diagram of a relation of operation of related devices.

Claims (2)

[Claims] 1. A caisson provided with a traveling rail inside a lower portion, a crane provided in an upper space of the caisson, an excavator provided horizontally movable on a traveling rail below the caisson, and earth and sand suspended from the crane. A caisson hoisting device composed of a grab that picks up the claw, and outputs a descent signal to the excavator when the grab descends, and the excavator that inputs this signal reduces the horizontal plane projection shape. 2. A caisson provided with a traveling rail inside the lower portion, a crane provided in an upper space of the caisson, an excavator provided horizontally movable on a traveling rail below the caisson, and earth and sand suspended from the crane. It is configured with a grab that picks up the grab, and outputs a descent signal to the excavator when the grab descends, the excavator that inputs this signal interrupts the excavation work, and then reduces the horizontal projection shape of the excavator. A caisson hoisting equipment