Ground improvement apparatuss and ground improvement method

a technology for ground improvement and ground structure, which is applied in the direction of foundation engineering, bulkheads/piles, construction, etc., can solve the problems of large load, difficult to smoothly construct the improved body, and the rotary shaft and bearing portion of the reuleaux become a large obstacle, so as to achieve convenient and reliable formation

Active Publication Date: 2022-07-07
FUDO CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables the formation of improved bodies with substantially polygonal cross sections efficiently and reliably, reducing the diameter of the outer pipe and minimizing load when penetrating the ground, thus facilitating smooth construction.

Problems solved by technology

Further, in the above ground agitator, the diameters of the Reuleaux rotary shaft and the bearing portion around the Reuleaux rotary shaft become large and thus the Reuleaux rotary shaft and the bearing portion become a large obstacle (load) when they penetrate into the ground, which makes it difficult to smoothly construct the improved body.

Method used

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  • Ground improvement apparatuss and ground improvement method
  • Ground improvement apparatuss and ground improvement method
  • Ground improvement apparatuss and ground improvement method

Examples

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first embodiment

[0020]FIG. 1 is a schematic configuration diagram illustrating a main part of a ground improvement apparatus according to the disclosure, FIG. 2 is a schematic configuration diagram of an interior of a connecting member 14 attached to a distal end 12a of an outer pipe 12 of the ground improvement apparatus, FIG. 3 is an explanatory diagram illustrating a dimensional relationship between a planetary gear 16 and a sun gear 15 fixed to a distal end 13a of an inner pipe 13 inserted into the outer pipe 12, FIG. 4 is a schematic configuration diagram of an inverse rotation mechanism 20 which reversely rotates the planetary gear 16 and an agitation shaft 17, and FIGS. 5A to 5G are explanatory diagrams of a substantially regular quadrangular trajectory K drawn by distal ends 18a of three agitation blades 18 by rotation of the agitation shaft 17.

[0021]As illustrated in FIG. 1, the ground improvement apparatus 10 includes a double pipe 11, an agitation shaft 17, a sun gear 15, a planetary gea...

second embodiment

[0028]FIG. 6 is a schematic configuration diagram illustrating a main part of a ground improvement apparatus according to the disclosure.

[0029]The ground improvement apparatus according to the second embodiment is different from the ground improvement apparatus according to the first embodiment in that, even when the distance between the center of the sun gear 15 and the center of the planetary gear 16 changes, meshing between the sun gear 15 and the planetary gear 16 is kept by utilizing the contraction / extension force of a spring (elastic body as a variable mechanism) 40 provided between the distal end 13a of the inner pipe 13 and a support shaft 16a of the planetary gear 16. Since the other elements are the same as those of the first embodiment, the same elements are denoted by the same reference numerals and detailed descriptions thereof are omitted.

[0030]Specifically, the ground improvement apparatus according to the second embodiment supports the sun gear 15 and the planetary ...

third embodiment

[0032]FIG. 7 is a schematic configuration diagram illustrating a main part of a ground improvement apparatus according to the disclosure.

[0033]The ground improvement apparatus according to the third embodiment is different from the ground improvement apparatus according to the first embodiment in that, even when the distance between the center of the sun gear 15 and the center of the planetary gear 16 changes, the sun gear 15 and the planetary gear 16 are meshed with each other by using a magnetic force between a magnet 41 provided on the distal end 13a of the inner pipe 13 and a magnet 16 provided on the support shaft 16a of the planetary gear 42. Since the other elements are the same as those of the first embodiment, the same elements are denoted by the same reference numerals and detailed descriptions thereof are omitted.

[0034]Specifically, the ground improvement apparatus according to the second embodiment supports the sun gear 15 and the planetary gear 16 by using the sun gear ...

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Abstract

A ground improvement apparatus includes: an irrotational sun gear fixed to an irrotational inner pipe inside a rotatable outer pipe; a planetary gear rotatably supported on a rotatable agitation shaft and configured to rotate while meshing with the sun gear; and an inverse rotation mechanism meshing with the planetary gear and rotating the agitation shaft in an opposite direction of the planetary gear. The agitation shaft is suspended on a connection member attached to the outer pipe so as to rotate in synchronization with a rotation center of the inverse rotation mechanism. A ground where the outer pipe is penetrated and a solidifying material discharged from the agitation shaft are agitated and mixed with each other by agitation blades radially attached to the agitation shaft with a trajectory of distal ends of the agitation blades drawing a substantially polygonal shape by rotation of the agitation shaft.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2021-000677, filed on Jan. 6, 2021, the entire contents of which are incorporated herein by reference.BACKGROUND1. Technical Field[0002]The disclosure relates to a ground improvement apparatus and a ground improvement method which form an improved body having a rectangular cross section by applying the principle of Reuleaux triangle.2. Related Art[0003]As a ground improvement apparatus, there is a ground agitator described in Japanese Unexamined Patent Publication No. 2006-336427. The ground agitator includes a drive mechanism, a discharge mechanism, excavation cutters, and agitation blades. The driving mechanism includes a Reuleaux rotary shaft, a bearing, and a driving unit. The Reuleaux rotary shaft has a cross-section of a Reuleaux triangle shape. The bearing rotatably supports a portion of the Reuleaux triangle shape in a s...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): E02D3/12E02D5/46
CPCE02D3/126E02D2250/0038E02D5/46
InventorNOZU, MITSUOIMAI, YUKIYAMASHITA, YUJI
OwnerFUDO CONSTR