JP2009293359A - Corotation preventing blade for ground improvement agitation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve agitating capability without impairing corotation preventing function even when the hole wall of an excavated hole is soft, and to improve the accuracy of construction by suppressing wobbling by external force during excavation. <P>SOLUTION: The corotation preventing blade for a ground improvement agitation device comprises four orthogonal blades, each blade having a trapezoidal tip shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ground improvement method for excavating, stirring, and mixing excavated soil and solidified material, and relates to a co-rotation preventing blade of the ground improved stirring device.

  Conventionally, there has been provided a co-rotation preventing structure in which a blade that is rotatably fitted to the excavation shaft of the ground improvement stirring device and that is larger than the diameter of the excavation blade disposed at the head of the excavation shaft is evenly disposed. However, the co-rotation prevention structure is composed of two co-rotation prevention blades, and has a drawback of rotating together when the hole wall surface of the excavation hole is soft. In addition, if the bulge is caused by external force at the time of excavation, the eccentric state is easily increased, and there is a disadvantage that power loss and construction accuracy are lowered.

Patent Document 1 is a common rotation prevention device that prevents a situation in which excavated soil rotates together with excavated blades and excavated blades, and is currently generally used. However, when the hole wall surface of the excavated hole is soft, If it is blurred by an external force during excavation, the eccentricity is likely to increase, and there is a drawback that power loss and construction accuracy are reduced.
JP-A-11-107268

  In view of the above, the object of the present invention is to improve the stirring ability without impairing the co-rotation prevention function even when the hole wall surface of the excavation hole is soft, and to suppress blurring due to external force during excavation. It is to improve accuracy.

  The present invention is a co-rotation preventing wing of a ground improvement agitating device comprising four blades orthogonal to each other and having a trapezoidal tip shape.

  By attaching a trapezoidal blade that extends from the outer edge of the excavation blade to the outer edge of the anti-rotation blade, the area that suppresses the hole wall surface is increased compared to the two anti-rotation blades of the conventional anti-rotation structure. In addition, the resistance increases and the effect of preventing co-rotation can be improved.

  By arranging the trapezoidal wings with the trapezoidal outer wings with four wings that are orthogonal to each other, the number of times the soil is cut during excavation is doubled. Compared to the co-rotation prevention blade, the effect of stirring is doubled, and the effect of improving construction accuracy and quality is obtained.

  By arranging four trapezoidal blades with the trapezoidal outer edge of the co-rotation prevention wings evenly arranged, vibration due to external force during excavation can be prevented (the outer edge of the co-rotation prevention wing is trapezoidal) The trapezoidal part of the plate) resists at the hole wall surface of the excavation hole, suppresses both vertical and horizontal blurring, and improves the stirring ability, construction accuracy and quality.

    Embodiments of the present invention are shown in FIGS. 1 to 8, and the present invention will be described based thereon. In the present invention, as shown in FIG. 1 (plan view), the blade plate 3 of the co-rotation preventing blade is constituted by four blade plates orthogonal to each other.

  FIG. 2 is a front view of a stirrer having blades characterized by a trapezoidal shape in which a blade plate 3 extends in parallel to the outer end of the excavating blade 4 and extends outward from the outer end to the outer end of the outer trapezoidal resistor plate 5. It is.

  FIG. 3 is a front view of the co-rotation preventing wing. The angle extending to the outer end of the excavating blade 4 and extending outward from the outer end to the outer end of the outer trapezoidal resistor plate 5 is in the range of 40 to 60 degrees, and is preferably about 45 degrees.

  FIG. 4 is a plan view of the co-rotation preventing wing. It consists of four blades orthogonal to each other, and the number of times of cutting the soil around the excavating blade is four times, which is twice as many as the two blades, and the stirring and mixing efficiency is increased.

    FIG. 5 is a front view of the co-rotation preventing wing and illustrates an increased portion of the resistance area on the hole wall surface. This increased portion increases the resistance as the distance extending from the outer end of the excavating blade to the outer end of the outer trapezoidal resistance plate 5 increases, and the corotation prevention effect is improved. Even about 100 mm is sufficient.

    FIG. 6 is a plan view of the co-rotation preventing wing. It explains the resistance of the trapezoidal resistor plate to the external force during excavation. By using four orthogonal wings, it is possible to resist external forces in the vertical and horizontal directions.

    FIG. 7 is a structural attachment diagram of the co-rotation preventing wing, and explains the shape and attachment method.

    FIG. 8 is a front view of the co-rotation preventing wing. Explains about 30mm thickness and 150mm height.

The stirring apparatus top view which concerns on this invention. The stirring apparatus front view which concerns on this invention. The front view of the co-rotation prevention wing | blade which consists of four wing | blades orthogonal to the present invention, and the tip shape of a wing | blade is trapezoid. The top view of the co-rotation prevention wing | blade which consists of four orthogonal wing | blade which concerns on this invention, and the front-end | tip shape of a wing | blade is trapezoid (explanation of the frequency | count of cutting soil in 1 round of excavation blades). The front view of the co-rotation prevention blade which concerns on this invention (installation area increase part description). The top view of the co-rotation prevention wing | blade which concerns on this invention (explanation of resistance with respect to external force). FIG. 3 is a structural attachment diagram of the co-rotation preventing wing according to the present invention (explanation of the attachment method). The front view (description of a dimension and a shape) of the co-rotation prevention wing | blade which concerns on this invention.

Explanation of symbols

1. Drilling shaft 2. Boss 3 3. Blades of co-rotation prevention wings 4. Excavator blade Trapezoidal resistance plate

Claims (1)

  An anti-spinning blade for a ground improvement stirrer comprising four blades orthogonal to each other and having a trapezoidal tip shape.

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