JP2813836B2 - Caisson drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an excavator for excavating the inside of a caisson.

<Prior Art> When excavating the inside of a caisson, there is a mechanism that fluidizes soil and sucks it together with muddy water.

Alternatively, there is also a mechanism in which a club is dropped without using muddy water and the ground is excavated by the impact.

<Problems to be Solved by the Present Invention> In the former device, since all of the discharged soil is muddy water, a dedicated device is required for the treatment, and there is a problem that it becomes difficult to excavate when the ground becomes hard.

The latter device does not have the problem of muddy water treatment, but can only excavate the area where the grab falls naturally, especially in the lower part of the cutting edge.

For this purpose, a method of hanging a heavy steel bar from the top and driving it under the cutting edge has been adopted, but it is extremely inefficient because it is a deep underground operation.

<Object of the present invention> The present invention has been made in order to solve such a problem, and provides an excavating device that can efficiently excavate including a lower portion of a cutting edge without using muddy water. The purpose is to do.

A further object of the present invention is to provide an excavator capable of automating a caisson excavation operation which has conventionally tended to rely on the intuition of an operator.

<Means for Solving the Problems> That is, the present invention is an apparatus having a structure in which excavated earth and sand at the bottom of a caisson is lifted up by a gripper suspended from the upper part of the caisson and discharged, and the caisson has a vertical interior. The tubular body is positioned as a passage for the earth and sand gripper, and a horizontal leg that can extend and contract in the horizontal direction extends around the periphery of the passage cylinder. Is a caisson excavator, which is configured by arranging an excavator capable of excavating the ground.

<Description of the Present Invention> Hereinafter, the present invention will be described in detail.

<A> Overall Configuration The excavator of the present invention is an apparatus having a structure in which excavated earth and sand at the bottom of the caisson 1 is pulled up by the gripper 2 suspended from above the caisson 1 and discharged.

<B> Gripping tool passage A cylindrical body is disposed below the caisson 1 as a grasping tool passage tube 3.

This passage tube 3 is not fixed to the caisson 1,
It is also possible to withdraw from the caisson 1 to the ground.

For this purpose, horizontal legs 31 which can be expanded and contracted in the horizontal direction are protruded around the passage tube 3 in two stages in the circumferential direction.

At least one of the plurality of horizontal legs 31 is configured to be extendable and contractable so that the passage tube 3 can always be positioned at the center of the caisson 1 in a planar manner.

Then, the passage cylinder 3 can support its position by taking a reaction force inside the caisson 1.

The upper end of the passage tube 3 is expanded in a trumpet shape toward the upper side so as to avoid collision with the gripper 2.

<C> Elevating Cylinder A vertically movable cylinder is provided as an elevating cylinder 5 on the outer periphery of the lower part of the passage cylinder 3.

A plurality of vertical jacks 42 are arranged between the elevating cylinder 5 and the passage cylinder.
The lifting cylinder 5 is configured to be able to move up and down along the outer periphery of the passage cylinder 3.

<D> Rotating cylinder A rotating cylinder 6 is rotatably mounted on the outer periphery of the lower part of the elevating cylinder 5.

For this purpose, for example, as shown in FIG.

On the other hand, the rotary cylinder 6 is installed so as to surround the periphery of the gear 51, and is arranged at a position where the drive gear 61 in the rotary cylinder 6 and the gear 51 at the lower end of the elevating cylinder 5 mesh with each other.

Then, the gears 51 and 61 mesh with each other and the rotating cylinder 6 rotates around the elevating cylinder 5 by the driving of the motor 62 provided on the rotating cylinder 6.

The lower end of the rotary cylinder 6 is also spread downward in a trumpet shape to avoid collision of the gripper 2 for excavation.

<E> Excavator The base end of the excavator 4 is attached to the outside of the rotary cylinder 6.

A jack is attached between the excavator 4 and the rotary cylinder 6,
The angle of the excavator 4 can be changed by the expansion and contraction of the jack.

As described above, since the rotary cylinder 6 and the passage cylinder 3 are not only rotatable but also slidable in the vertical direction, the range of selection and change of the excavation position can be set widely.

The lifting and lowering of the lifting cylinder 5, the rotation of the rotary cylinder 6, and the operation of the excavator 4 are all performed by hydraulic pressure supplied from the ground. Supply of hydraulic pressure is performed by a flexible hose, and supply of pressure is simple if the rotation limit of the rotary cylinder 6 is limited to 360 degrees.

<F> Control mechanism The above numerical values such as the bucket position and the excavation depth of the excavator 4 are managed and controlled by, for example, a distance sensor attached to the rotary cylinder 6.

That is, if the position of the digging bottom can be continuously grasped from the position of the rotary cylinder 6, the digging situation can be illustrated by the control device on the ground.

In this illustrated situation, the excavator 4 can be sequentially moved to a position where the remaining excavation is large, and excavation work can be performed continuously.

<Excavation work> Passage tube 3 with horizontal legs 31 projecting around as described above
Is suspended in caisson 1 and horizontal legs 31
The length is extended to take a reaction force around and fix the position.

Next, the excavator 4 is operated to excavate the ground at the bottom, and the excavated earth and sand is collected at the center position.

At the center position, the gripper 2 is suspended from above, and is taken out of the caisson 1 by grasping earth and sand.

The rotating cylinder 6 can be slid vertically in the vertical direction by a small distance with respect to the passage cylinder 3 as the lifting cylinder 5 moves up and down. Therefore, the rotating cylinder 6 is lowered as the excavation progresses.

Then, since the position of the excavator 4 is lowered, it is possible to continuously excavate a certain range.

Since the excavable range extends below the blade of the caisson 1, stable settlement of the caisson 1 can be achieved.

When the excavation to the extent possible has been completed, the rotary cylinder 6 is slightly pulled up by reducing the vertical jack, and the excavator 4 is retracted so that the excavator 4 is not damaged by the sinking of the caisson 1.

<Effects of the Present Invention> Since the present invention has the above-described configuration, the following effects can be achieved.

<a> Since it is possible to directly lift and excavate without using mud, there is no need for uneconomic equipment or work such as mud treatment.

<B> The earth and sand at the bottom of the caisson can be efficiently excavated, including the lower part of the cutting edge.

<C> It is possible to automate caisson excavation work, which has conventionally relied on the intuition of workers.

[Brief description of the drawings]

 FIG. 1: Explanatory drawing of one embodiment of the apparatus of the present invention. Fig. 2: Explanatory drawing of passage tube Fig. 3: Explanatory drawing of main part

Claims (1)

(57) [Claims] 1. A device having a structure in which excavated earth and sand at the bottom of a caisson is pulled up by a gripper suspended from the upper part of the caisson to discharge the soil, and a vertical cylinder is located inside the caisson as a passage for the soil and sand gripper. A horizontal leg that can expand and contract in the horizontal direction extends around the passage cylinder, and an excavator that can move around the periphery of the passage cylinder and excavate the ground at the bottom of the caisson is located below the passage cylinder. Caisson drilling rig