JP3024353U - Coexistence prevention structure of excavated soil in ground improvement excavator - Google Patents

Abstract

(57) [Abstract] [Problem] In a ground improvement excavator, a stirring effect is increased while preventing coexistence of excavated soil and excavation blades, and even if there are obstacles such as gravel or rubble during excavation, Provide an avoidable excavator co-rotation preventing structure. In a ground excavator, a bearing is fixed between an excavating blade and an agitating blade of an excavating shaft, and a cylindrical cam that is eccentric to the axial center of the excavating shaft is loosely engaged with the bearing. A cylindrical member is loosely fitted to the outer circumference of the cam, and at least three or more co-rotation preventing blades having a diameter slightly smaller than the drill hole are radially attached to the cylindrical member from the center of the cam, and by the bearing and the cylindrical cam. The structure shall be such that the vertical movement of the radial co-rotation prevention blade is restricted.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a structure of a building device of a reinforced earth construction method for improving deep ground, in which a filler is mechanically mixed and solidified in soft ground, and for reinforcing ground.

[0002]

[Prior Art and Problems to be Solved by the Invention]

 Conventionally, an apparatus for improving the ground into a cylindrical shape has been used, as already disclosed in Japanese Patent Application No. 55-56970. That is, an excavating blade and several stages of stirring blades are provided on the excavating shaft. Further, a co-rotation preventive blade having a diameter larger than the excavation diameter, which is freely rotatable with respect to the rotation of the rotary shaft, is fitted between the excavation blade and the stirring blade to restrain the vertical movement of the co-rotation prevention blade. . When the excavation shaft is rotated and advanced, the co-rotation prevention blade stops rotation due to the resistance of the ground, and prevents the excavated soil excavated by the excavation blade from co-rotating with the excavation blade. In the sandy soil, there is no problem if there is no anti-rotation blade, but in the cohesive soil and peat layer, the soil to be improved along with excavation co-rotates with the agitator and sufficient agitation was not obtained. Therefore, the co-rotation prevention structure is forcibly prevented from co-rotating and is well agitated with the filler injected from the flow path provided in the excavation shaft to improve the soil even in cohesive soil or peat layer soil. It is a thing.

However, in the structure as described above, the co-rotation preventing blade is one in the radial direction of the drill hole and has a diameter larger than the excavation diameter. For example, if an obstacle such as gravel or lithic stone is encountered, excavation will be impossible. Therefore, in order to solve this problem, as disclosed in Japanese Patent Application No. 6-1386, the co-rotation preventive vanes are attached to the excavation shaft to restrain the co-rotation preventive vanes from rotating in one direction. , The structure that allows rotation in the opposite direction and avoids obstacles such as gravel and stones is described. According to the present invention, a plurality of co-rotation preventing blades are provided radially in the radial direction of the excavation hole to allow co-rotation at a fraction of the rotation of the excavation blade to prevent co-rotation. It is an object of the present invention to provide a mixing and stirring device for excavated soil that avoids gravel and crushed stone by a device having a structure completely different from that of the above-mentioned Japanese Patent Application No. 6-1386 while performing shearing and stirring effects.

[0004]

[Means for Solving the Problems]

 In a ground improvement excavator that excavates and withdraws an excavator equipped with excavation blades and agitating blades by a predetermined excavation mechanism while rotating, and mixes and agitates the soil and the filler, the excavating blades of the excavating shaft and the agitating blades A bearing is fixed in between, a cylindrical cam that is eccentric to the shaft center of the excavating shaft is loosely engaged with the bearing, a cylindrical member is loosely engaged with the outer periphery of the cylindrical cam, and At least three or more small-diameter co-rotation preventing blades are attached radially from the center of the cam, and the vertical movement of the radial co-rotation preventing blades is restricted by the flange of the bearing and the flange of the cylindrical cam. The purpose is to prevent the excavated soil from rotating together in the ground improvement excavator.

[0005]

[Embodiment of device]

 Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an elevation view of a co-rotation preventing blade according to the present invention, and FIG. 2 is a plan view thereof.

A bearing 4 is fixed to the upper portion of the excavation blade attached to the tip of the excavation shaft 5, and an eccentric cam 3 having a cylindrical diameter is loosely engaged with the bearing 4. The center of the eccentric cam 3 is eccentric by γ from the axis of the excavation shaft 5. The cylindrical member 2 is fitted around the outer periphery of the eccentric cam 3. Three or more, five in the figure, co-rotation preventing blades 1 are radially fixed from the center of the eccentric cam 3 to the outer circumference of the cylindrical member 2. The outer diameter of the co-rotation prevention blade should be slightly smaller than the drill hole diameter. Vertical movement of the cylindrical member 2 is restrained by the collar 3a of the eccentric cam 3, and vertical movement of the eccentric cam 3 is restrained by the collar 4a of the bearing 4.

Next, the operation of the co-rotation preventing blade will be described.

Since the co-rotating blade 1 is eccentric to the excavation axis during the excavation by the excavating blade, one or more co-rotating blades extend beyond the diameter of the excavation hole, and the excavated soil excavated by the excavating blade is excavated. It acts to prevent co-rotation between the excavator and the excavation blade. On the other hand, one or more co-rotation prevention blades are located within the diameter of the excavation hole and try to co-rotate with the rotating excavated soil being excavated by the excavation blades. Therefore, if the value of the eccentricity γ is determined so that the co-rotation work is slightly superior, co-rotation is allowed at a fraction of the excavation axis. Since there are multiple co-rotation prevention blades, the number of shears that the excavated soil receives is increased and the stirring effect is improved. At the same time, it is not completely integrated with the excavation blade, but does not co-rotate with the excavating blade, and it has an excellent effect on cohesive soil and peat layers.

Further, even when the co-rotation prevention blade faces the gravel or cobblestone during excavation and the excavation does not proceed, the excavation shaft is advanced and withdrawn while rotating forward and reverse to prevent eccentric co-rotation. It can rotate the blades to avoid obstacles and does not affect the progress of excavation.

[0011]

[Effect of device]

 According to the present invention, the excavated soil does not completely co-rotate with the excavation blade, but allows the co-rotation appropriately, and the number of co-rotation prevention blades causes the excavated soil to undergo shearing It increases the stirring effect and brings excellent effects in cohesive soil and peat layers.

Further, even when the co-rotation prevention blade faces the gravel or cobblestone during excavation and the excavation does not proceed, the excavation shaft is advanced and withdrawn while rotating forward and reverse to prevent eccentric co-rotation. It can rotate the blades to avoid obstacles and does not affect the progress of excavation.

[Brief description of drawings]

FIG. 1 is an elevation view of a co-rotation preventing wing according to the present invention.

FIG. 2 is a plan view of the co-rotation preventing blade of the present invention.

[Explanation of symbols]

1 ... Co-rotation prevention blade, 2 ... Cylindrical member, 3 ... Eccentric cam, 3a ... Tsuba, 4 ... Bearing, 4a ...
Tsuba, 5 ... Excavation axis, 6 ... Excavation circle, 7 ... Co-rotation prevention wing circle

Claims (1)

[Scope of utility model registration request] 1. A ground improvement excavator for advancing and withdrawing an excavator provided with an excavation blade and a stirring blade by a predetermined excavation mechanism while rotating to mix and agitate excavated soil and a filler.
A bearing is fixed between the excavating blade and the stirring blade of the excavating shaft, a cylindrical cam that is eccentric to the axial center of the excavating shaft is loosely engaged with the bearing, and a cylindrical member is loosely engaged with the outer periphery of the cylindrical cam. At least three or more co-rotation preventing blades having a diameter slightly smaller than that of the drilled hole are radially attached to the cylindrical member from the cam center, and the radial co-rotation preventing blades are vertically moved by the flange of the bearing and the cylindrical cam collar. A structure for preventing co-rotation of excavated soil in a ground improvement excavator characterized by restraining movement.