JP3245659B2 - Ground improvement equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a soil improvement device, in particular, in a civil engineering work, a ground improvement material such as a solidified material is mixed into the ground.
The present invention relates to a soil improvement device used in a large-capacity soil improvement method for stirring and mixing the solidified material with soft soil.

[0002]

2. Description of the Related Art As an apparatus used in a conventional method for improving soft ground, for example, as shown in FIG. 3, a cutting blade 3 and a cutting blade 4 are provided at a tip, and stirring blades 2 and 2a are provided at a plurality of positions of a shaft body 1a. A device comprising a provided excavation shaft 1 is known.

[0003]

This device has an outlet 6
When stirring and mixing the solidified material discharged from the stirrer with the soil, especially in the case of highly viscous soil, the soil tends to adhere to the stirring blades, so that the stirring blades and the soil rotate together, resulting in poor mixing accuracy and consolidation. There is a disadvantage that the variation in soil strength is increased.

As a countermeasure for preventing co-rotation between the attached soil and the stirring blade, the co-rotation of the soil can be prevented by providing a co-rotation prevention device 5 as shown in FIG.

[0005] However, in the case of soil having low viscosity or disturbed soil, the co-rotation preventing device co-rotates with the soil, and there is a problem that mixing accuracy with the solidified material is deteriorated.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problem that the mixing accuracy of the soil and the solidified material is deteriorated due to the co-rotation phenomenon caused by the adhesion of the mixed soil to the stirring blade. is there.

The present invention has been made in order to solve the aforementioned problems.
In a device for improving the ground by stirring and mixing excavated soil and solidified material by rotating the excavating shaft provided with the excavating blade and the excavating wing while rotating the excavating shaft, the agitating blade provided above the excavating wing of the excavating shaft. The diameter of the shaft of the excavation shaft at the attachment site is smaller than the diameter of the shaft at the other sites, and the solidification material discharge port is provided on the shaft at the installation site of the stirring blade. That was done.

[0008]

By forming the shaft body diameter at the mounting portion of the stirring shaft of the excavating shaft to be smaller than the shaft body diameter of the other portions above and below the boring shaft, the shaft and the shaft of the stirring blade of the boring shaft are formed. A gap is formed between the body and the body, so that the adhesive force between the soil and the excavation shaft can be reduced.

Further, the solidified material slurry injected from the solidified material discharge port into the gap between the ground and the excavation shaft and the fluid such as powder and granules conveyed to the air act between the soil to fill the gap. It acts as a lubricant and prevents adhesion of mixed soil near the excavation axis.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment, and FIG. 2 shows another embodiment. In FIG. 1, reference numeral 1 denotes an excavating shaft having a hollow excavating shaft.
And a stirring blade 4 for assisting excavation. The shaft diameter of the shaft body 1a of the excavating shaft 1 to which the stirring blades 2 and 2a are attached is formed to be smaller than the shaft diameters of the other shaft bodies 1b and 1c.

On the other hand, although not shown, the hollow excavating shaft of the excavating shaft 1 is supported by an elevating device of a base machine, and is rotated by a driving device so as to penetrate the ground and raise the excavating shaft. I do. The hollow portion of the hollow excavation shaft has a flow passage communicating with the solidified material supply passage, and further communicates with the solidified material discharge port 6 provided on the shaft body 1a at the attachment site of the stirring blades 2 and 2a. It is configured to eject a fluid such as a solidified material slurry.

FIG. 2 shows another embodiment in which the shaft body 1a at the mounting portion of the stirring blades 2 and 2a has the same shaft diameter as that of the shaft body 1b and the discharge port. The shaft diameter expanding members 7 and 7a are provided on the shaft body 1d at the lower part of 6, and the stirring blades 2 and 2a
Are formed to be smaller than the shaft diameter of each of the mounting portions.

In the embodiment, the example in which the number of the stirring blades is two and the solidified material discharge port is one is shown. However, the number of the stirring blades and the number and the position of the discharge ports are not limited thereto.

[0014]

According to the present invention, as described in detail, the gap between the excavation shaft and the surrounding ground reduces the adhesive force between the soil and the excavation shaft, and furthermore, the fluid such as the solidified material slurry injected into the gap becomes free from the gap. Works between the soil and the soil to be filled to prevent the mixed soil from adhering to the excavation axis, promotes muddy soil, eliminates the co-rotation phenomenon, and enables efficient stirring and mixing. Was.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing an embodiment of a ground improvement device of the present invention.

FIG. 2 is a front view of a main part showing another embodiment of the ground improvement device of the present invention.

FIG. 3 is a front view of a main part of a conventional ground improvement device.

FIG. 4 is a front view of a main part of another conventional ground improvement device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling shaft 1a Shaft body of stirring blade attachment part 2, 2a Stirring blade 3 Drilling blade 4 Drilling blade 5 Solidification material discharge port 7, 7a Shaft diameter expanding member

Continuation of the front page (56) References JP-A-4-38320 (JP, A) JP-A-63-300109 (JP, A) JP-A-63-9334 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) E02D 3/12 102

Claims (2)

(57) [Claims] The excavated soil and the solidified material are stirred and mixed by rotating an excavating shaft provided with an excavating blade and an excavating wing while rotating the excavating shaft,
In the apparatus for improving the ground, the diameter of the shaft of the excavation shaft at the mounting portion of the stirring blade provided above the excavation blade of the excavation shaft is formed to be smaller than the diameter of the shaft of the other portion. A ground improvement device, wherein a solidification material discharge port is provided at a wing mounting portion. 2. An apparatus for improving the ground by rotating a digging shaft provided with a digging blade and a digging wing while rotating the digging shaft so as to stir and mix the solidified material with the digging. A solidification material discharge port is provided on a shaft body at a mounting portion of the stirring blades, and a shaft diameter expansion member is provided on a shaft body of a digging shaft above a top stirring blade provided on the shaft body and an upper shaft body of the cutting blade. Wherein the shaft diameter of the shaft body is formed to be larger than the shaft diameter of the shaft body at the stirring blade mounting portion.