JPH05247933A - Construction method of cast-in-place concrete pile - Google Patents

Abstract

PURPOSE:To simplify greatly stage of work, to save man-power and, at the same time, to reduce a construction period as well as promotion of execution reliability and earthquake resistance by incorporating a leg section of a steel frame column as a reinforcing steel frame of a pile head section. CONSTITUTION:Cage-shaped reinforcing bars 2 are inserted into a bored hole 10 in the ground to erect, and a leg section 5a of a steel frame column 5 is inserted into at least the upper part of the cage-shaped reinforcing bars 2 to provide. Concrete 6 is placed in an erection part of the cage-shaped reinforcing bars 2 in the bored hole 10, and the leg section 5a of the steel frame column 5 is constructed as a pile having a pile head section 1b of steel framed concrete construction reinforced by concrete.

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 cast-in-place piles suitable as foundation piles for various concrete structures.

[0002]

2. Description of the Related Art A conventional cast-in-place pile is a cage-shaped reinforcing bar 11 assembled with a large number of pile main bars 12 and band bars 13 in a drilling hole (not shown) deeply drilled in the ground as shown in FIG. 2), the pile head 11b, which receives a large seismic load, is constructed by placing concrete in the built-in portion of the cage-shaped rebar 11 in the drilled hole 12 and strips 13 are arranged at narrow intervals to reinforce them to form a seismic-resistant structure in which bending strength and shear strength are increased, and the footing portion 11a is integrally connected to a pillar 15 of concrete or a steel structure by anchor bolts or the like. It is connected and built.

[0003]

As described above, the conventional cast-in-place pile is reinforced by arranging a large number of pile main bars and straps at narrow intervals on the pile head, and also on the footing thereof. Since the pillars 15 of the building are integrally connected and built, connecting and building the pillars is a troublesome work performed in a narrow drilling hole in the ground, requires a lot of labor and time, and saves labor. Shortening the construction period has become an issue.

The present invention was developed to address the above-mentioned problems, and the purpose of the invention is to incorporate the legs of steel columns as reinforcing steel frames for pile heads. It is to provide a method for constructing cast-in-place piles that greatly simplifies the process, saves labor, shortens the construction period, and improves construction reliability and earthquake resistance.

[0005]

According to the present invention, a cage-shaped reinforcing bar is inserted and built in a hole drilled in the ground, and a leg portion of a steel column is inserted and arranged in at least an upper portion of the cage-shaped reinforcing bar. By placing concrete in the built-in portion of the cage-shaped reinforcing bar in the drilled hole and constructing the legs of the steel column into a pile with a concrete-reinforced steel-reinforced concrete pile head, It is significantly reinforced to enable the reduction of reinforcing bars and the simultaneous connection of columns.

[0006]

[Function] Insert a cage-shaped rebar into the drilled hole in the ground and build it,
The legs of the steel column were inserted and placed in at least the upper part of the cage-shaped reinforcing bar, and the concrete was laid in the hole of the cage-shaped reinforcing bar in the drilled hole, and the legs of the steel column were reinforced with concrete. Constructed into cast-in-place piles with steel-framed concrete pile heads, pile construction can be performed easily and quickly with a simple process, and pillars can be connected and built at the top of the piles at the same time. The pile heads can be rebarred significantly, and the pile heads and column joints are greatly reinforced to provide excellent earthquake resistance and construction reliability.

[0007]

1 shows an embodiment of the present invention, in which 1 is a cast-in-place pile, 1a is a footing portion formed on the upper portion of the cast-in-place pile 1, 1b is a pile head made of SRC, and 2 is a Cage-shaped rebars assembled from a large number of pile main bars 3 and stirrups 4 are steel columns,
Reference numeral 5a is a leg portion of the steel frame column 5 and 10 is a drilling hole, and the cage-shaped reinforcing bar 2 is inserted and built into the drilled hole 10 deeply drilled in the ground as shown in the drawing. The leg portion 5a of the steel column 5 is inserted and arranged in the upper portion, and the concrete 6 is placed in the built-in portion of the cage-shaped reinforcing bar 2 in the drilled hole 10 to form the steel column 5
Cast-in-place pile 1 for constructing a leg portion 5a of a pile into a pile having a steel-reinforced concrete pile head portion 1b reinforced with concrete 6.
It has become a building method.

As shown in the figure, the cast-in-place pile 1 is an SRC structure (steel reinforced concrete) in which at least a leg portion 5a of a steel column 5 is inserted and arranged in a basket-shaped rebar 2 of a pile head 1b for a desired length. (Build) pile head 1b, and the pile head 1
b is the leg portion 5a of the steel column 5 inserted and arranged in the cage-shaped reinforcing bar 2 so that the bending strength and the shear strength are significantly increased,
As shown in the figure, there is no need to add additional reinforcing bars to the pile heads 1b, and the cage is composed of cage-shaped reinforcing bars 2 in which the same number of main pile reinforcing bars 3 and band reinforcing bars 4 are evenly distributed over the entire length of the pile, simplifying the reinforcing bar process. Easy,
Arranged quickly. Further, the steel frame column 5 is built into the pile head portion 1b at the same time as the pile is constructed and is integrally connected and built, so that the column connecting step is not required and the process is greatly simplified.
The labor is saved and the construction period is significantly shortened, and the bending strength and shear strength of the cast-in-place pile 1 are easily and freely adjusted by adjusting the insertion length of the steel column 5 into the cast-in-place pile 1. There is no variation in the construction accuracy of the column connection part,
Excellent construction accuracy and reliability are obtained, and seismic performance is significantly improved.

When the cast-in-place pile 1 is built deeply in the ground as shown in FIG. 1, the footing portion 1a is excavated and the foundation of the concrete structure is constructed, and the concrete structure is sequentially constructed from the 3rd floor under the ground. It In addition to the illustrated example, various types of steel are applied to the steel column 5. Also, cast-in-place pile 1
It is also possible to construct up to the position of the footing portion and omit the footing 1a.

[0010]

The present invention has the above-mentioned structure.
A cage-shaped rebar is inserted into the drilled hole in the ground to build it, and the lower leg of the steel column is inserted and placed in at least the upper part of the cage-shaped reinforcing bar. Is cast into a cast-in-place pile having steel-reinforced concrete pile heads where the legs of the steel columns are reinforced with concrete,
The piles can be built easily and quickly by a simple process, and the pillars can be connected to the top of the piles and built up at the same time so that the piles can be installed in one piece. The construction period will be shortened significantly, and the construction reliability will be improved and the pile heads and column connections will be greatly reinforced, resulting in excellent earthquake resistance.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention (A).
And an enlarged sectional view (B) of the main part of the same figure and a sectional view (C) taken along the line Xc-Xc.

FIG. 2 is a longitudinal sectional view (A), an arrow Yb-Yb sectional view (B) and an arrow Yc-Yc sectional view (C) of a cast-in-place pile showing a conventional example.

[Explanation of symbols]

 1 Cast-in-place pile 1b Pile head 2 Basket-shaped rebar 5 Steel frame column 5a Steel frame leg 6 Concrete 10 Drilling hole

Claims (1)

[Claims] 1. A cage-shaped rebar is inserted and built in a hole drilled in the ground, a leg portion of a steel column is inserted and arranged in at least an upper portion of the cage-bar, and a cage-shaped bar is formed in the hole. A method for constructing a cast-in-place pile, comprising placing concrete in a built-in portion of a reinforcing bar, and constructing a leg portion of the steel column into a pile having a concrete-reinforced steel-reinforced concrete pile head.