JPS6033185Y2 - Cone-shaped roller rabbit with wings - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cone-shaped mouth rabbit suitable for excavating cast-in-place piles in cobblestone layers using reverse construction methods such as air lift type and suction pump type.

To excavate cast-in-place piles using the reverse method, three-winged bits, four-winged bits, jumbo bits, roller bits, conical bits, etc. are used.

However, when excavating a cobblestone (gravel) layer, if the cobblestones are large, they will clog the pipes of the circulating water system, preventing water from circulating and making excavation impossible.

For this reason, the boulders must be crushed to the extent that they do not clog the pipes of the circulating water system.

Cone-type roller bits are used to excavate rock by applying the weight of the bit to the rock.

However, although this roller bit is suitable for crushing hard rock, depending on the geology mixed with the cobblestones, the bit claws may become clogged, making it unsuitable for crushing the cobblestones, or the weight from above may damage the soft parts of the cobblestones. The boulder's destruction and scraping effects are reduced by running away.

The present invention was developed in view of this.

In the figure, reference numeral 1 denotes the main body of the low bit, which has a size matching the diameter of the excavated hole, and a number of cutter rollers 2 are protruded from the lower surface of the main body.

The cutter roller 2 is a cantilever type, a saddle type, etc., and the cutter is a center cutter, a gauge cutter, etc. suitable for the geology to be excavated, and the shape of the roller bit body is a cone bottom type.

Three or more wings 3 are protruded from the outer periphery of the row and rabbit body 1 in the radial direction and at a desired dihedral angle, and a large number of claws 4 of gravel bits are protruded from the container 3.

In the cone-type roller bit of the present invention, which has a plurality of blades with gravel bit claws protruding at an angle on the outer periphery of the roller bit, it is attached to the lower end of the rod pipe, and is attached to the rotary table. When the bit is rotated by the rotation of the bit and a weight similar to that of a bit is applied, suction is applied by a reverse machine on the ground, or water is circulated by an air lift, the gravel layer bit's claws protruding from the wings mix in the cobblestone layer. The cobblestones that are covered are dug.

At this time, the roller bit body is cone-shaped, and the wings have dihedral angles, so the bottom of the hole being drilled is conical with a lower center, and the boulders raised in the trench by the claws of the wings are removed by the rotation of the bit. Move to the center of the hole.

These boulders are prevented from escaping and are cut by a rotating roller cutter while being subjected to the weight of a cone-type roller bit, and are broken down to a desired particle size by repeating the impact pressure path due to impact and mutual interference between the boulders.

Therefore, according to the present invention, since the cone-type roller bit is integrally provided with dihedral-angled wings with protruding pawls of a gravel layer bit on the outer periphery of the cone roller bit, it is possible to dig even in soft cobblestone ground. The boulders are guided to the underside of the roller cutter and are reliably crushed, allowing smooth excavation work without clogging the pipes of the circulating water system.

[Brief explanation of the drawing]

FIG. 1 is a front view of the cone type roller bit of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a bottom view. 1...Main body, 2...Cutter roller,
3...Wings, 4...Claws.

Claims (1)

[Scope of utility model registration request] This cone-type roller bit has a plurality of wings protruding radially from the outer periphery of the cone-type roller bit with a desired dihedral angle, and the container is provided with a large number of gravel bit claws.