JP2017036545A - Horizontal multi-spindle type hole excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excavate a circular hole for a foundation pile by a horizontal multi-spindle type excavator capable of efficiently crushing a cobblestone in a proper size.SOLUTION: A horizontal multi-spindle type excavator for oppositely arranging an excavation drum 2, is formed in a circular arc 21 on the outer peripheral edge in a cross section of including a rotary shaft of the excavation drum, and vertically excavates up to the predetermined depth, and excavates a circular hole by excavating an unexcavated part 7 orthogonally to the initial direction by rotating the direction by 90 degrees by pulling up the excavation drum 2. Even when meeting with a gravel layer and a boulder layer in the middle of excavation, these can be crushed by the oppositely arranged excavation drum 2, and excavation is temporarily stopped by an appearance of a boulder, and the circular hole can be efficiently excavated without crushing-removing the boulder by separate means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hole excavator based on a horizontal multi-axis excavator for trench excavation, and relates to a horizontal multi-axis excavator capable of efficiently excavating holes in the ground.

  In general, a wing bit having a large number of teeth shown in FIG. 7 is used in an excavator for excavating a hole for a foundation pile. This wing bit is attached to the tip of a hollow rod (reverse pipe) made of steel pipe, and a hole is formed in the ground by rotating the rod while pressing the wing bit against the excavation surface. At the time of excavation, water is supplied to the excavation hole, and excavated sediment is sucked up together with water through the hollow portion of the rod and discharged to the ground.

In the wing bit, during excavation, the excavating teeth are always pressed against the excavation surface, and thus a great excavation resistance is applied. Rotating the rod against this resistance requires a large amount of power for drilling, so power may be insufficient to form a hard formation or a large diameter drilling hole, and the drilling speed will decrease and drilling The problem is that the construction period is prolonged due to the reduced speed.
In addition, this wing bit has no problem if the drilling target is earth and sand because the drilling teeth rotate only around the rod, but if it encounters a gravel layer or cobblestone layer, it cannot crush the gravel or cobblestone. If a cobblestone larger than the inner diameter of the rod is present, it cannot be sucked up and cannot be excavated.

The horizontal multi-axis type excavator was developed for grooving to construct an underground continuous wall. Two conventional horizontal multi-axis type excavators are provided in the excavator body 1 as shown in FIG. The cylindrical excavation drums 2 having a horizontal rotation axis are arranged in parallel, and the excavation teeth 3 and 3 are arranged on the surfaces of the excavation drums 2 and 2 at appropriate intervals in the rotation axis direction and the circumferential direction. It is. Then, the excavation drum 2 is rotated in opposite directions to excavate earth and sand. The cobblestone can be sandwiched between the excavating teeth 3 by the excavating teeth 3 of the excavating drum 2 rotating in the reverse direction and crushed by shearing force. The hollow rod 61 to be discharged can be crushed to be smaller than the inner diameter.
The crushed cobblestone and excavated earth and sand are scraped and collected on the center side of the excavator body 1 by the rotation of the excavating drum, and discharged to the ground through the rod 61 together with the excavated mud water by the pump provided on the ground part or the pump provided on the excavator body 1. Therefore, there is a track record of excavating gravel and cobblestone layers without problems.

Patent Document 1 (WO2009 / 066359) discloses a configuration in which side cutters 31 are provided on both end surfaces of a horizontal multi-axis excavator and the excavation drum can be rotated around a vertical axis. ing. The horizontal multi-axis excavator is used to excavate a groove in the ground, and the drill 61 is rotated around the vertical axis (rod) by rotating the rod 61 while continuing excavation by the excavating drum at the bottom of the excavated groove. To form a circular enlarged portion at the bottom of the square pillar or groove (see FIG. 6 (1)), or by pulling up the horizontal multi-axis excavator while rotating the excavating drum around the vertical axis It is disclosed to form a shaped drill hole. (See Fig. 6 (2))
The horizontal multi-axis excavator is mainly intended for grooving, and in order to excavate a hole with a circular cross section, the excavation drum must be rotated around the vertical axis while excavating with the excavation drum, and the intermediate position of the rod It was necessary to provide a stabilizer for the rotary excavation reaction force, and side cutters were required on both end faces of the excavation drum.

WO2009 / 066359 Japanese Patent No. 4636997

  The present invention enables a circular hole for a foundation pile or the like to be excavated by a horizontal multi-axis excavator capable of efficiently crushing cobblestones or the like to an appropriate size.

A circular hole can be formed by rotating excavation of the excavation drum by forming the outer edge of the excavation drum of the horizontal multi-axis excavator into an arc shape.
More specifically, it is an excavator in which a drilling drum that rotates around a horizontal rotating shaft is opposed to both ends of a hollow rod that supplies drilling mud, and has a cross section including the horizontal rotating shaft of the drilling drum. This is a horizontal multi-axis drilling machine whose outer edge is a circular arc.
Further, the excavation drum is a horizontal multi-axis type drilling machine that is a rotating body with a chord of a partial circle as an axis, or both ends of the rotating shaft of the circular arc rotating body are notched so that both ends of the excavating drum are flat surfaces. This is a horizontal multi-axis type drilling machine.

  By making the outer edge shape of the excavation drum into an arc shape, by rotating the direction of the excavation drum of the horizontal multi-axis excavator by 90 degrees, it is possible to excavate a hole with a circular cross section, and the horizontal multi-axis excavator The cobblestone that is inherently crushed and discharged is maintained without loss, so even if it is a cobblestone layer, drilling of the foundation hole is continued without interrupting drilling, and the construction time is reduced. Can be achieved.

Sectional drawing of one Example of the excavation drum which used the outer edge as the circular arc. Sectional drawing of the other Example of the excavation drum which used the outer edge as the circular arc. The front view of a horizontal multi-axis type hole excavator. Explanatory drawing of the drilling procedure of a hole. The front view of the conventional horizontal multi-axis type excavator for underground continuous walls. The perspective view of the example which formed the cylindrical hole using the horizontal multi-axis type excavator. The front view of the wing bit currently used for excavation of a pile hole.

  An overall view of the horizontal multi-axis type hole excavator of the present invention is shown in FIG. Excavation drums 2 that rotate around a horizontal axis are arranged in parallel to each other at the bottom of the excavator body, and the excavation teeth 3 are arranged on the surface of the excavation drum 2 at appropriate intervals in the axial direction and the circumferential direction. It is. The excavation teeth 3 are not provided in a fixed section from the left and right end portions 20 of the excavation drum toward the center. In order to excavate a circular hole, as will be described later, since the excavation drum 2 is rotated 90 degrees to perform excavation for the second time, left and right end portions of the excavation drum 2 are duplicated. . Therefore, it is not necessary to provide excavation teeth in the portion corresponding to the overlapping excavation portion.

The horizontal multi-axis type drilling machine of the present invention is for excavation of a circular hole, and as shown in FIG. 1, the arcuate periphery of the circular hole is formed by the rotation of the excavation drum 2. In the cross section including the rotation axis, the outer peripheral edge is an arc 21, and the shape of the excavation drum 2 is a rotating body having an arcuate string which is a part of a circle as a rotation axis.
The excavation drum 2 collects the earth and sand excavated by rotating in reverse directions to the center side of the excavator body 1, sucks it together with excavation mud from the suction port of the reverse pipe 61 provided at the lower part of the excavator body 1, and discharges it to the ground. Is.

A process of forming a circular hole by rotating the excavating drum 2 whose outer peripheral edge of the cross section including the horizontal rotation shaft of the present invention is an arc while supplying the drilling mud to the drilling hole will be described with reference to FIG.
4 (1) to 4 (3) show the steps. First, as shown in (1), the excavating drum 2 of the horizontal multi-axis type drilling machine is rotated to excavate vertically to a predetermined depth. Since the outer peripheral edge of the excavation drum 2 is a circular arc, the shape of the hole to be excavated is excavated from the earth and sand in the section where the cross-sectional shapes of the excavation drum 2 are arranged in parallel as shown in the lower side of (1). The space between the excavating drums 2 is left as an unexcavated portion 7.
Next, as shown in (2), the horizontal multi-axis type drilling machine is once lifted to the ground, and the direction of the excavating drum 2 is rotated by 90 degrees so as to be orthogonal to the initial direction of the excavating drum 2. Then, as shown in (3), the unexcavated portion 7 generated in the circular section in the step (1) is excavated by a horizontal multi-axis type drilling machine to complete a circular hole.
Since excavation is performed with the excavating drum 2 arranged opposite to each other, it is possible to crush the gravel layer or cobblestone layer during the excavation. Circular holes can be excavated efficiently without crushing and removing.

  The excavation drum 2 shown in the cross-sectional view of FIG. 2 is obtained by cutting the left and right end surfaces 20 of the excavation drum 2 into a flat surface. In the excavation drum 2 in the example of FIG. 1, the drum where the excavation teeth 3 are not provided is omitted.

DESCRIPTION OF SYMBOLS 1 Excavator 2 Drum 20 End 21 Arc 3 Excavation tooth 61 Reverse pipe (rod)
7 Unexcavated part

Claims (3)

A drilling machine in which a drilling drum that rotates around a horizontal rotary shaft is opposed to both ends of a tip of a hollow rod that supplies drilling mud, and the outer edge of the cross section including the horizontal rotary shaft of the drilling drum is a horizontal arc Multi-axis drilling machine. The horizontal multi-axis type drilling machine according to claim 1, wherein the excavation drum is a rotating body having a partial circular chord as an axis. The horizontal multi-axis type drilling machine according to claim 2, wherein both left and right ends of the drilling drum are cut off on a flat surface.