JP2866248B2 - Construction method of hollow pipe pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a hollow pipe pile as a foundation of a structure.

[0002]

BACKGROUND OF THE INVENTION The applicant has previously disclosed in Japanese Patent Application No. 4-33228 a method for constructing a hollow pile, in which one or a plurality of spiral wings are provided on the outer periphery of the tip of the hollow pile. It discloses that the hollow pile is rotated and inserted into the soil cement column while forming the soil cement column in the mounting ground. Also in this case, the anti-corotating wing, which has been developed and implemented by the applicant first, is provided. If this co-rotation preventing wing of stirring and mixing the adhesion of the ground, but in which non-modified soil to prevent the phenomenon that rotates together with the stirrer turned bunching, it is larger than the drilling diameter size of co-rotation prevention wings Therefore, when excavating hard ground such as a support layer, the anti-corotating wing becomes a resistance, and the excavation speed is greatly reduced. If the ground is particularly hard, excavation becomes impossible.

[0003] The present invention to solve the above problems, the diameter of the co-rotation preventing blades at under drilling diameter or less, and Ru der that the invention of the application was improved development.

[0004]

According to the method for fabricating a hollow pipe pile of the present invention, at least two leaf spiral wings are provided on the outer periphery of the tip of the hollow pipe pile, and the tip of the hollow pipe pile is formed at the tip. Projecting beyond the tip
The anti-corotating wing provided on the excavator passed through the hollow pipe pile should be less than or equal to the excavation diameter in its expanded state.
So as to, while construct a soil cement pillar in front Symbol excavator, the projecting end of the spiral blade in engagement with the co-rotation preventing wing, opposite the excavator said hollow tube piles and co-rotation prevention wings Rotate in the direction and insert it into the soil cement column
It is characterized by the following. The excavator has been
What is used for construction of embedded pile by digging method
The anti-corotating wing can be easily added as before.
Can be engineered. Also, usually this type of construction method
Solidified material liquid such as cement milk is ejected from the tip of the cutter
And mix with earth and sand to create soil cement columns,
The method of embedding a hollow pipe pile in it is adopted.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a hollow pipe pile to be buried, at least two leaf blades 1 are attached to the outer periphery of the tip of the steel pipe pile A so as to protrude from the tip of the steel pipe pile A. The required number of spiral blades 1 may be provided at an intermediate position of the steel pipe pile A.

At the tip of the excavating rod 2 of the excavator B, a wing-spreading bit 3, an anti-corotation wing 4 slightly shorter than the digging diameter by a wing-spreading structure, and a stirring blade 5 are protruded.

At the tip of the excavator B, there is a spout of a solidified material liquid such as cement milk, and the excavator B is rotated by an auger motor while spouting the solidified material liquid from the spout to form a soil cement column. I do. At this time, the tip of the spiral wing protruding from the tip position of the steel pipe pile A becomes the co-rotation prevention wing 4.
Then, the steel pipe pile A and the co-rotating wing 4 are rotated in the opposite direction to the excavator B, inserted into the soil cement column and buried, and finally the excavator B is pulled up.

At this time, the tip of the steel pipe pile A may be inserted to the bottom of the excavation hole or may be stopped at a high level.

As shown in FIG. 3 (b), an attachment ring 6 is preferably provided on the inner surface of the tip to integrate the tip of the pile and the staking part. Instead of this attachment ring, a steel pipe with an inner surface projection may be used.

[0010]

The present invention has the above construction,
The spiral wing of the steel pipe pile, provided is protruded from the distal end, to engage with the co-rotation prevention wings shortened from below substantially drilling diameter, rotate the steel pipe pile and co-rotation preventing blade opposite Direction and excavator Since it is inserted , the resistance at the time of excavation is reduced, and the work can be easily carried out even on the hard ground of the support layer.

In addition, a hollow pile such as a steel pipe pile is inserted and buried at the same time as the soil cement column is formed by the middle digging method. As the soil is discharged to the ground through the ground, the soil is not discharged from the head of the hollow pile and there is no dirt on the site due to scattering. In addition, since the outer diameter of the spiral blade and the co-rotation prevention blade is substantially the same as the outer diameter of the soil cement column, there is no misalignment between the soil cement column and the hollow pile.
No.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a construction process according to the present invention, wherein (a) and (b) show the construction sequence.

FIGS. 2A and 2B are cross-sectional views of a construction process according to the present invention, wherein FIGS.
The following construction order is shown.

[Figure 3] a hollow tube piles obtained by the construction method of the present invention, (a) (b) shows a different embodiment.

[Explanation of symbols]

A: steel pipe pile, B: excavator, C: earth and sand, D: consolidation 1 ... spiral wing, 2 ... drill rod, 3 ... drill bit,
4 ... co-rotation prevention blade, 5 ... stirring blade, 6 ... adhesion ring.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 5/46 E02D 5/54

Claims (1)

(57) [Claims] 1. Spiral wings around the tip of a hollow pipe pile
Set <br/> only as its tip protrudes from the distal end position of the hollow Kankui, its co around prevention wings provided on excavator through the hollow tube piles
In the expanded state such that the drilling diameter substantially equal diameter or less under
And, while construct a soil cement pillar in front Symbol excavator, said
By locking the protruding end of the spiral blade to the co-rotation prevention wings,
Method of constructing a hollow tube piles, characterized in that the insertion by rotating the pre-Symbol hollow pipe piles and co-rotation preventing blade in the opposite direction to the excavator soil cement pillar.