JP2000297430A - Cast-in-place concrete pile for removing steel pipe pipe formwork - Google Patents

Abstract

(57) [Summary] [Purpose] The foundation pile can be driven easily even on a small site. [Construction] A cast-in-place concrete pile formwork consisting of a steel pipe pipe (2) and a detachable steel pipe cap (3) at the tip. is there. As accessories for embedding the formwork, there are a spiral blade (a) necessary for rotary embedding, a conical arrowhead (b) necessary for press-fitting of a digging blade (c), and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile work required for foundation work of civil engineering construction.

[0002]

2. Description of the Related Art A general foundation pile is a special large-diameter cast-in-place concrete pile, such as a hammer, hydraulic, cement milk, or a certified method.

[0003]

[Problem to be solved by the invention] The pile driving method using ready-made piles cannot be carried out on a narrow road surface site or a narrow site because the transport of concrete piles and pile driving machines becomes large. Pile driving with a hammer or hydraulic pressure causes nearby pollution such as noise and vibration. Cement milk and the certified method use ground perimeter fixation solution and contaminate groundwater.

[0004]

[Means for Solving the Problems] In this method, a steel pipe pipe is used as a formwork. In a narrow site, a short pipe is used. If the machine is small, cast-in-place concrete piles on narrow land can be used. In places where noise, vibration, etc

[FIG. 3] Noise and vibration can be eliminated by this method of press-fitting and burying a steel pipe with a spiral blade shown in BC of FIG. Does not pollute groundwater because there is no need for pile circumference fixative used in cement milk

[0005]

[Function] Since the mold to be buried is a steel pipe, it can be buried in a predetermined layer without being destroyed by a strong external force of rotation and vibration compared to a concrete pile or the like.

[0006]

【Example】

[Fig. 1] Explanation according to (A) If necessary, dig into a predetermined position with an auger. (B) Put the steel pipe-pipe concrete formwork of the present invention into a pile driving machine. (C) Rotate, vibrate, press fit, etc. to the steel pipe concrete formwork of the present invention, bury it to the specified position, and then put the necessary reinforcing steel into the steel pipe and cast concrete. (D) Immediately after placing the concrete, remove the tip cap and pull it up while applying rotational vibration to the steel pipe formwork. At this time, the concrete is sufficiently filled in the voids. (E) The cast-in-place concrete pile is completed by pulling up the steel pipe-pipe concrete formwork of the present invention.

The steel pipe is repeatedly used as a mold to reduce the cost, and the length of the concrete pile can be secured freely by joining the steel pipe. There is a wide range of ready-made steel pipes for the pile diameter, and it can be used as a small-to-medium-scale foundation pile or in narrow lands or densely packed buildings. After removing the steel pipe pipe formwork, this pile becomes a formwork instead of a formwork, and when the concrete is hardened, the stratum surface and concrete surface are adhered to each other, and the effect can be expected as a friction pile.

[Brief description of the drawings]

FIG. 1 is a view showing the procedure of a cast-in-place concrete pile construction procedure.

FIG. 2 is a perspective view of the tip of a steel pipe pipe formwork according to the present invention. (A) In the case of a buried method by mounting a conical arrowhead under a tip cap and press fitting. (B) In the case of the embedding method by rotary press-fitting with the excavating blade below the tip cap and the spiral blade around it. (C) In the case of a burial method by attaching a drilling blade under the tip cap and a spiral blade around the bottom of the steel pipe, and rotating and press-fitting.

FIG. 3 is a cross-sectional view (A), (B), and (C) of the end portion of the steel pipe pipe form according to the present invention;

FIG. 4 is a longitudinal sectional view (A), (B), and (C) of a tip portion of a steel pipe pipe form according to the present invention;

FIG. 5 is a longitudinal sectional view showing a completed cast-in-place concrete pile according to the present invention. (A) A longitudinal sectional view of concrete cast into a steel pipe pipe formwork according to the present invention. (B) A tip cap and a steel pipe type. Cast-in-place concrete pile that is completed when the form is separated from the frame and the form is raised

[Explanation of symbols]

 (1) Auger (2) Steel pipe formwork (3) Tip cap (4) Cast-in-place concrete pile (A) Spiral blade (B) Conical arrowhead (C) Drilling blade

Claims (2)

[Claims] 1. A steel pipe (2) and a steel pipe cap (3) which can be detachably attached to the tip of the steel pipe. A spiral blade (a), a conical arrowhead (b), an excavating blade (c), etc. are provided for embedding them. Cast-in-place concrete pile formwork. 2. The steel pipe is rotated, vibrated, press-fitted, etc., buried in a predetermined position, cast into concrete using the mold as a formwork, and immediately thereafter, the steel pipe is vibrated and rotated to raise the steel pipe while necessary. Filling concrete using a vibrator and removing steel pipe according to the method of making cast-in-place concrete pile