JP2866252B2 - 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, such as a steel pipe pile, which is laid in a soil cement column.

[0002]

The applicant has previously developed various methods of laying a hollow pipe pile in a soil cement column while forming the soil cement column on site. An example is the invention of Japanese Patent Application No. 4-33228.

[0003] In these inventions, there is no collapse of the hole wall, the hollow pipe pile can be securely inserted to a predetermined length, and a soil cement column using the original ground as an aggregate is formed, so that a small amount of residual soil is generated. Furthermore, since the inside of the excavation hole is filled with soil cement of almost the same specific gravity as the original ground, the surrounding ground does not release stress due to excavation, and the pile supports vertically.

[0004] The present invention to further increase the vertical bearing capacity of the pile, using a high-pressure injection, originating a strong solid Do tip bearing capacity
An attempt is made to provide expanded root compaction bulbs to conduct.

[0005] An excavator having an excavating wing and an agitating wing is inserted into a hollow pipe pile, and the hollow pipe pile and the excavator are rotated in the reverse direction while ejecting solidified material from the excavating head, so that the soil and soil are removed. drilling, kneading, a hollow tube piles and sinking into soil cement in columns in the ground while construction of soil cement pillar to a predetermined depth, and then to promote only the drilling head to a predetermined depth position, the drilling of the drill head while rotating the excavator while jetting laterally solidified material liquid from the injection nozzle provided in the blade tip up pull <br/>, to construct a larger bulbs at the bottom of the hollow tube piles, followed by
The stirring pipe and the drilling wing are reduced by using the hollow pipe pile as a reaction force.
And press-fit the hollow pipe pile into the expanded bulb and excavate it.
A method for constructing a hollow pipe pile, wherein the machine is collected on the ground .

[0006] The method of constructing a hollow tube piles of the present invention, drilling F
Drilling rod with drilling wings and stirring wings on the ladder
Into the hollow pipe pile with the drilling wing and stirring blade expanded.
Inserting and extruding solidified material from the drilling head , the hollow pipe pile and the excavator are rotated in reverse to excavate and knead the soil and sand, while building the soil cement column to the specified depth, Sinking in the soil cement column, then propelling only the excavation head to a predetermined depth position, while rotating the excavator while injecting the solidified material liquid laterally from the injection nozzle provided at the excavation wing tip of the excavation head Pulling up, forming an enlarged bulb at the lower part of the hollow pipe pile, then reducing the stirring blade and the excavating wing by making the hollow pipe pile a reaction force, and rotationally press-fitting the hollow pipe pile into the enlarged bulb. It is characterized in that the excavator is collected on the ground.

[0007]

EXAMPLES hollow tube piles A consisted steel, the excavator B on the inner side are inserted drilling blade 3 and the stirring blades 4 of拡翼structure is provided in the drilling head 2 at the tip of the drill rod 1 and provided the discharge ports 5 of the solidified materials such as cement milk, also in the middle portion are stabilizer 6 is provided which can be rotated.

[0008] The hollow pipe pile A and the excavator B are rotated in the reverse direction while the solidified material is ejected from the excavating head 2 to excavate and knead the ground soil. While constructing C, the hollow pipe pile A is submerged in the soil cement column C in the ground, and then only the excavation head 2 is propelled to a predetermined depth position, and the injection nozzle provided at the tip of the excavation wing 3 of the excavation head 2 The excavator B is pulled up while rotating the excavator B while injecting the solidified material liquid from 7 at a high pressure to the side.
As a result, an enlarged bulb D having a predetermined height is provided below the hollow pipe pile A.
Can be created.

Next, the agitating blades 4 and the excavating blades 3 are reduced by using the hollow pipe pile A as a reaction force to recover the excavator B to the ground, and the hollow pipe pile A is rotationally pressed into the enlarged bulb D.

[0010]

According to the present invention, the excavator is rotated while injecting the solidified material at a high pressure from the injection nozzle provided at the tip of the excavation wing of the excavation head to the pile root compaction part. enlarged root compaction bulbs are reclamation, direct pressure to the surrounding ground, and more possible to lateral displacement, originating strong tip supporting force
Volatilization to support piles can the resulting Rukoto.

[0011] In a state where pressure loading on by soil cement is applied, surrounding ground of the enlarged root compaction bulbs further subjected to pressure, can be more larger more robust expansion larger bulbs and lateral displacement, Hollow with large tip support capacity as a support pile
A pipe pile is obtained.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an implementation state, in which I, II and III are shown in the order of construction.

FIG. 2 is a cross-sectional view of the embodiment, in which I, II and III are shown in the following construction order.

[Explanation of symbols]

A: hollow pipe pile, B: excavator, C: soil cement column, D
... Expanded bulb, 1 ... Drilling rod, 2 ... Drilling head, 3 ... Drilling blade, 4 ... Stirring blade, 5 ... Discharge port, 6 ... Stabilizer, 7
… Injection nozzle

Claims (1)

(57) [Claims] 1. A drilling head having a drilling blade and a stirring blade.
The drilling rod of the excavator,
The excavator is inserted into the hollow pipe pile in a state where the solidified material is ejected from the drilling head, and the hollow pipe pile and the excavator are rotated in the reverse direction to excavate and knead the soil and build a soil cement column to the specified depth. While sinking the hollow pipe pile in the soil cement column in the ground, then only the drilling head is propelled to the predetermined depth position,
The excavator is pulled upward while rotating the excavator while injecting the solidifying material liquid from the injection nozzle provided at the tip of the excavation wing of the excavation head to form an enlarged bulb below the hollow pipe pile, A method for constructing a hollow pipe pile, characterized in that a stirring wing and a drilling wing are reduced by using a pipe pile as a reaction force, a hollow pipe pile is rotationally pressed into an enlarged bulb, and an excavator is collected on the ground.