JP4897640B2 - Excavation stirrer for ground improvement - Google Patents

Description

  The present invention relates to an improvement of a ground excavation and stirring device provided with a rotation prevention mechanism.

  The first invention in which the anti-rotation blade is provided in this type of conventional excavation and stirring apparatus is disclosed in Patent Document 1. And there are some which are shown in patent documents 2 and patent documents 3 as the improvement plan.

Japanese Patent Publication No.58-29374 JP 60-78013 A JP-A-62-82114

  In the above invention, sufficient mixing and stirring is possible in normal ground, but it is expected that mixing and stirring is difficult in highly viscous soil. Therefore, the present invention has a configuration in which a large number of blades for preventing rotation are provided, and the purpose is to improve mixing and stirring by increasing the number of blade cuttings.

In the present invention, an excavating blade and upper, middle, and lower three-stage rotating agitating blades are provided at the tip of a rotating shaft that is rotated by a driving device, and a further one-stage rotating agitating blade is further provided on the excavating blade. When the top base ring at a vertical spacing between the rotary stirring blades are provided in the outer tube is provided between the base ring, and top and bottom transverse sides using the upper and lower outer tubes, upper and lower Rotation prevention wings that have a U-shape when viewed from the side that is wider than the thickness of the vertical sides that connect the horizontal sides of the two sides are fixed. A resistance flange consisting of a small plate-shaped protrusion protrudes in the in-plane direction perpendicular to the width direction of the blade, and the resistance flange is bitten into the inner wall of the perforation. An excavating and agitating device for ground improvement, characterized in that it projects inwardly. .

The present invention has the above-described configuration, and is provided at the periphery of the rotation shaft, and is provided on the inner side of the central portion of the vertical side of the rotation prevention blade and the three-stage rotation stirring blade located inside the U-shaped rotation prevention blade. Since the upper and lower stirring blades protrude from opposite directions, the stirring efficiency of the stirring earth and sand can be remarkably improved.
In addition, the resistance flange consisting of a small plate-shaped projecting piece projecting in the in-plane direction perpendicular to the width direction of the U-shaped anti-rotation vane is in a state where it bites into the perforated inner wall, and the vertical side of the anti-rotation vane The rotation of the upper and lower agitating blades projecting from the center of the perforated wall can be securely stopped.

The embodiment of the present invention is as shown in the figure. At the tip of a rotating shaft 1 rotated by a driving device, there are an excavating blade 2 and three stages of upper, middle, and lower rotating stirring blades spaced apart from each other. A one-stage rotary stirring blade 3 projects from above, and base rings 4 and 4 are provided between the excavating blade 2 and the uppermost rotary stirring blade 3 with a vertical space therebetween. An outer tube 5 is provided between the upper and lower lateral sides 6a and 6a using the upper and lower outer tubes 5 and 5 , and the width is larger than the thickness of the vertical side 6b connecting the upper and lower lateral sides 6a and 6a. A rotation prevention wing 6 having a U-shape when viewed from the side is fixed, and a resistance flange 7 made of small protrusions is formed on the outer side of the vertical side 6b of the rotation prevention wing 6 in three stages, upper, middle, and lower. The upper and lower stirring blades 8 protrude from the inside of the vertical side 6b . In use, the rotary shaft 1 is rotated, and the excavating blade 2 is drilled and inserted into the ground. The resistance flange 7 of the anti-rotation wing 6 is in a state of biting into the perforated wall and does not rotate. Accordingly, the excavated earth and sand are mixed and stirred by the rotary stirring blade 3, the anti-rotation blade 6, and the upper and lower stirring blades 8 projecting inside the center of the vertical side 6 b of the anti-rotation blade 6.

It is a side view of an Example. It is a top view of an Example.

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft 2 ... Excavation blade 3 ... Rotary stirring blade 4 ... Base ring 5 ... Outer tube 6 ... Circulation prevention blade 6a ... Horizontal side 6b ... Vertical side 6c ... Connection part 7 ... Resistance flange 8 ... Stirring blade

Claims (1)

At the tip of the rotating shaft (1) rotated by the driving device, there are an excavation blade (2), an upper, middle, and lower three-stage rotating stirring blade (3) and a further one-stage rotating stirring blade ( 3) is protruded, and a base ring (4) is provided between the excavating blade (2) and the uppermost rotary stirring blade (3) with a vertical interval, and an outer space between the base ring (4) is provided. A pipe (5) is provided, and the width is larger than the thickness of the upper and lower lateral sides (6a) and the vertical side (6b) connecting the upper and lower lateral sides (6a) using the upper and lower outer pipes (5). A rotation prevention wing (6) having a U-shape when viewed from the large side is fixed, and the rotation prevention wing (6) of the rotation prevention wing (6) is arranged on the outer side of the vertical side (6b) of the rotation prevention wing (6). A resistance flange (7) consisting of a small plate-shaped protrusion protrudes in the in-plane direction perpendicular to the width direction, and the resistance flange (7) bites into the perforated inner wall By drilling stirrer for ground improvement, wherein the central portion inside the upper and lower stirring blades (8) are projected toward an inner direction of the vertical side (6b).

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