JPH0941416A - Cylindrical drilling bucket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a cylindrical hole in a ground by opening and closing two drilling cutters in the shape of slantly cutting a cylinder with a hydraulic cylinder for drilling. SOLUTION: When cutter ends are pushed into soil in the opened condition of a bucket and oil pressure in a hydraulic cylinder 4 is fed to the pull-in direction of a cylinder rod, the cutter ends 1, 2 are moved to the closed direction of the bucket to trap soil. After trapping soil, the bucket is lifted up, soil is discharged and drilling is finished. By repeating such procedures, a hole is drilled at a preset depth. The cutters 1, 2 are rotated on the axis of a center line and the contact of the lower end of the cutter 1 with the lower end of the cutter 2 shows the closed condition of the bucket, when the upper end face is nearly elliptical internally contacting the upper end face of the bucket in the opened condition. The hole is completly cylindrical above the upper end face of the cutters and nearly elliptical thereunder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket device for excavating a cylindrical hole in the ground.

[0002]

2. Description of the Related Art Although it was necessary to excavate a cylindrical hole in the ground for the foundation work of a building or the like, conventionally, while excavating a cylindrical bucket, an excavating blade attached to the lower end is used for excavation. Also, even in a bucket having an excavating blade similar to the shape of the blade of the present invention, the excavation method by wire-driving is a very low weight, so that the excavation efficiency is very poor, and the self-weighting bucket cannot be accurately positioned. Since it could not be done, soil retention called a cylindrical casing had to be applied and this had to be used as a guide for excavation.

[0003]

DISCLOSURE OF THE INVENTION The present invention is capable of performing conventional low-efficiency cylindrical excavation with higher efficiency, and further, in the case of a self-supporting ground (mainly groundwater does not gush out),
The purpose was to be able to excavate without retaining soil called a casing.

[0004]

Therefore, the bucket of the present invention is provided with two excavating blades having a shape in which the outer periphery of the excavating blade has a substantially cylindrical shape when the bucket is open, and one shape is attached. As shown in FIG. 1 of the drawings, a cylinder is obliquely cut.

A mechanism for opening and closing two excavating blades of this shape by a hydraulic cylinder is attached to the tip of an arm of a machine such as a hydraulic excavator that can take a hydraulic source, and the structure can be pushed by the weight of the hydraulic excavator. did.

[0006]

1 is a view for explaining that the excavating blade has a cylindrical shape. In this figure, the upper end surface of the blade is a perfect circle when viewed from the top when the bucket is open.

The blade 1 and the blade 2 rotate about the center line C,
The state where the blade lower end 1 and the blade lower end 2 are in contact is the bucket closed state, and at this time, the upper end surface has a shape close to an ellipse inscribed with the circle of the upper end surface in the bucket opened state.

Further, the shape seen from the direction of arrow A in FIG. 1 is a scoop shape with a pointed tip, so that this bucket is difficult to be soiled.

The bucket having this shape is pushed into the soil in the open state, the soil is captured when the state shifts to the bucket closed state, the bucket is lifted after the capture is completed, and the soil is discharged to complete the excavation. By continuing this, it is possible to excavate a hole with a predetermined depth, but the hole is completely cylindrical up to the upper end surface of the blade, and below that is a little close to an ellipse. If there is a problem in practical use, the structure is such that the bucket can be rotated 90 °.
By rotating 0 ° and excavating only the bottom, a substantially cylindrical hole can be obtained up to the bottom of the excavation.

[0010]

Embodiments Embodiments will be described with reference to the drawings. FIG. 3 is an overall view of the bucket. The bucket open state is shown by a solid line and the bucket closed state is shown by a two-dot chain line.

With the bucket open, push the blade into the soil,
When hydraulic pressure is sent to the hydraulic cylinder 4 in the direction of pulling in the cylinder rod, the blade edges 1 and 2 move through the link 3 in the direction of bucket closing to promote soil.

As shown in FIG. 6, this bucket is mounted on a hydraulic excavator or the like, and has a structure capable of pushing and excavating by the weight of the hydraulic excavator or the like and lifting the bucket to remove soil.

[Brief description of drawings]

FIG. 1 is a model diagram showing that a bucket excavating blade has a shape obtained by obliquely cutting a cylinder.

FIG. 2 is a view of the entire bucket as viewed from above.

FIG. 3 is an overall view of the bucket, showing an opening / closing operation by a hydraulic cylinder by a solid line and a two-dot chain line.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a perspective view of the entire bucket.

FIG. 6 is an overall view of a state in which the bucket is attached to the hydraulic excavator.

[Explanation of symbols]

 1 Excavator 1 2 Excavator 2 3 Link 4 Hydraulic cylinder 5 Mounting frame

Claims (4)

[Claims] 1. A bucket which is attached to the tip of an arm of a hydraulically operated excavator and which can be pushed in by applying the weight of the excavator. 2. When the bucket is open, it has a cylindrical shape when viewed from above. 3. The bucket excavating blade is composed of two blades, and the shape thereof is a shape in which a cylinder is obliquely cut. 4. An operation for driving two excavating blades to grab the soil is performed by a hydraulic cylinder.