JP3262827B2 - Construction method of hollow 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 ready-made pile.

[0002]

2. Description of the Related Art In recent years,
Because it is difficult to secure a disposal site for construction surplus soil, the development of a pile foundation method that generates less construction surplus soil is required.
A construction method combining a soil cement column and a ready-made pile has been invented. As a method of constructing the composite pile, there are a pre-boring construction method in which a ready-made pile is inserted after soil cement column formation, and a middle digging construction method in which the ready-made pile is inserted while rotating the soil cement column while forming the soil cement column.

[0003] The pre-boring construction method has the disadvantage that the center deviation between the soil cement column and the ready-made pile is large and the construction length is short. Underground digging is a method in which soil cement and other soil is discharged from the pile head through the hollow part of the ready-made pile at the time of construction, which scatters the soil and soils the construction site and construction machinery and causes failure of the construction machinery. There is a drawback that the efficiency is reduced and the possibility of a physical injury to the on-site worker due to the fall of the discharged soil is increased.

The present invention has been developed in view of the above circumstances.

[0005]

Means for Solving the Problems] The present invention, source in the ground
The outside diameter is soil cement column while creating the il cement column
One leaf or multiple spirals that are approximately the same diameter as
Rotate and insert a hollow pile with wings attached to the tip of
Earth removal along the outer periphery of hollow pile
It is a method of constructing hollow piles, characterized by discharging to a pile.
The preferred construction method in this construction method is spiral
Tip of wing protrudes below tip of hollow pile
This is a method of constructing a hollow pile, and the tip of the hollow pile is
This is a method for constructing a hollow pile in which spiral wings are embedded.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two spiral blades 1 and 1 are protrudingly mounted on a hollow pile to be buried, particularly on the outer periphery of the tip of a steel pipe pile A.
The excavating rod 2 of the excavator B is provided with an excavating bit 3 to which a widening wing is fixed, a co-rotation prevention wing 4 and a stirring wing 5. The excavator B is provided with an outlet for solidified material liquid such as cement milk at the tip thereof. The excavator B is rotated by an auger motor while extruding the solidified material liquid, and excavated to form a soil cement column. While rotating the steel pipe pile A in the opposite direction to the excavator B, the steel pipe pile A is inserted and buried in the soil cement column, and the spiral wing 1 at the tip of the steel pipe pile A is placed in the rooting portion b.
Position. The excavator B is pulled up and collected.

[0007] The spiral blade 1 has a single leaf or a plurality of two or more leaves, the outer diameter of which is substantially the same as that of a soil cement column. The number of spiral blades 1 has a relationship with the inclination angle, but preferably two or more spiral blades. The spiral wing 1 brings the soil cement formed by mixing and agitation of the ground and the solidifying material liquid in the excavation section preceding the steel pipe pile A into the outer peripheral part of the steel pipe pile A, and discharges it to the ground by pushing it up. Let it. The spiral wing 1 can be provided intermittently or continuously over the entire length of the pile to improve the soil discharging effect. At this time, spiral wing 1
When the tip of the steel pipe pile projects a little below the steel pipe pile A, the function of bringing the soil cement into the outer peripheral part of the steel pipe pile A is further improved. Further, if the outer diameter of the spiral blade 1 is larger than the outer diameter of the soil cement column, it becomes difficult to insert the steel pipe pile A,
If the diameter is smaller than the outer diameter, misalignment is likely to occur, and the integrity of the outer periphery of the steel pipe pile A with the soil cement column is reduced,
Tip support force decreases.

[0008]

According to the present invention, the present invention has the above-described structure, and a hollow pile such as a steel pipe pile is inserted and buried at the same time as a soil cement column is formed by a middle digging method. Due to the effect of attracting the wings, it is mainly discharged to the ground through the soil cement column on the outer periphery of the hollow pile, so that no soil is discharged from the head of the hollow pile and there is no dirt on the site due to scattering. Further, since the outer diameter of the spiral blade is substantially equal to the outer diameter of the soil cement pillar, discharge as described above
The soil function can be exhibited, and there is no misalignment between the soil cement column and the hollow pile.

Furthermore, the tip of the spiral blade 1 is a steel pipe pile A
If it protrudes slightly downward, the function of attracting soil cement to the outer periphery of the steel pipe pile A is further improved, and the soil discharging function is further improved.
To improve.

Further, the effect of soil cement pillar tip and a hollow pile tip and high strength is the spiral vanes, more firmly integrated Then tip bearing capacity of piles is significantly improved
Is obtained together with the soil removal effect during construction .

[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.

FIG. 3 is a sectional view of a construction process according to the present invention.
The following construction order is shown.

[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 ... anti-rotation blade, 5 ... stirring blade.

Claims (3)

(57) [Claims] 1. A leaf having an outer diameter substantially equal to the diameter of the soil cement column while forming the soil cement column in the ground.
Alternatively, rotate and insert a hollow pile with multiple spiral wings attached to the tip of the outer circumference, and use the spiral wings to remove soil
A method for constructing a hollow pile, wherein the pile is discharged to the ground along the outer periphery of the hollow pile. 2. The spiral wing has a tip protruding downward from a tip of the hollow pile.
Construction method of hollow pile. 3. Spiral at the tip of the hollow pile at the tip root fixing part
3. The wings are buried.
Construction method of hollow pile.