JPH0718675A - Sc pile and executing method thereof - Google Patents

Abstract

PURPOSE:To dispense with the anchor reinforcing bar welding work at the site and improve the connecting strength to a footing and reliability by burying a plurality of anchor reinforcing bars in a concrete cylindrical body constituting an SC pile in advance. CONSTITUTION:An SC pile 1 is driven into the ground until the distance from the end face of the SC pile 1 to the upper face of the flattening concrete B on the ground becomes the prescribed length. Flattening cobble stones A are laid on the ground to surround the outer periphery of tone SC pile 1, then the flattening concrete B is placed on them. Filler concrete C is filled in the SC pile 1 to the same height as that of the flattening concrete B. A steel pipe 1a is melted and removed from slightly above the flattening concrete B to the end face of the SC pile 1. The concrete at this portion is demolished to expose anchor reinforcing bars 3. A foundation beam main reinforcement is bonded to the exposed anchor reinforcing bars 3 to form a footing D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SC pile for supporting and fixing a footing which is a basis of a building structure and a civil engineering structure, and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, for example, an SC pile a for supporting and fixing a footing D is known in which a steel pipe c is coated on the outer periphery of a concrete tubular body b.

[0003]

However, the conventional SC described above is used.
According to the construction method using the pile a, the S that has been placed underground
In order to support and fix the footing, the anchor bar d must be separately welded vertically to the steel pipe c on the peripheral surface of which the C pile a is slightly exposed from the upper surface of the leveling concrete B on the ground. However, there is a problem in that the welding posture is poor and it is difficult to perform welding sufficiently, and the reliability of welding is reduced.

It is an object of the present invention to solve the above problems and provide an SC pile having a simple structure and high reliability in construction, and a construction method thereof.

[0005]

To achieve the above object, the present invention provides a steel pipe, a concrete tubular body cast on the inner peripheral surface of the steel pipe, and an axially embedded concrete tubular body. It is characterized by comprising a plurality of anchor rebars.

[0006]

[Operation] An SC pile is driven into the ground.

Then, the steel pipe portion from the leveled concrete to the upper part of the ground is left, and the steel pipe covered from the upper part of the concrete to the end face of the SC pile is melted and removed, and the steel pipe is removed. Dismantle the exposed part of the concrete in the concrete tubular body.

On the other hand, the steel pipe portion from the leveled concrete on the ground to the upper side of the small area is left in advance, and the S pipe is formed from the upper side of the small area.
In the SC pile in which the steel pipe portion up to the end surface of the C pile is removed, the exposed portion of the concrete tubular body of the SC pile is placed above and the SC pile is driven into the ground to expose the concrete tubular body. Dismantle parts.

Thus, by exposing the anchor rebar embedded in the axial direction of the concrete tubular body, the anchor rebar can be used as it is for supporting and fixing the footing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes an SC pile, which is a steel pipe 1a covering the entire length thereof, a concrete tubular body 2 on the inner peripheral surface of the steel pipe 1a, and an axial direction of the concrete tubular body 2. It consists of a plurality of anchor rebars 3 embedded.

Next, the construction method of this embodiment will be described with reference to FIG.

First, the SC pile 1 is first driven into the ground by a pile driving machine or the like until the distance from its end face to the upper surface of the leveling concrete B on the ground becomes a predetermined length.

Next, a leveling stone A is leveled on the ground so as to surround the outer periphery of the SC pile 1, and leveling concrete B is further placed on the leveling stone A.
And laying concrete in the SC pile 1
Is filled to the same height as the leveled concrete B.

Next, the steel pipe 1a from a little above the leveled concrete B to the end face of the SC pile 1 is melted and removed, and the concrete of the concrete tubular body 2 corresponding to the portion where the steel pipe 1a is removed is dismantled. Then, the plurality of anchor rebars 3 embedded in the axial direction of the concrete tubular body 2 are exposed.

Then, a main beam (not shown) is attached to the exposed anchor reinforcing bar 3 and a mold is fitted into the anchor reinforcing bar 3, so that fresh concrete is poured into the footing D.

Thus, the anchor rebar 3 can be directly supported and fixed to the footing D without being welded to the SC pile 1, so that the construction reliability of the SC pile 1 is improved.

FIGS. 4 and 5 show another embodiment of the present invention, in which the concrete tubular body 2 is exposed from its end face for a predetermined length, and the remaining portion of the concrete tubular body 2 is steel pipe 1a. It is an SC pile 1 covered with 1., and has an effect that it is possible to omit the work time for fusing and removing the covered steel pipe 1a when exposing the plurality of anchor rebars 3.

[0019]

As described above, according to the SC pile of the present invention,
Since it is composed of a steel pipe, a concrete tubular body in the steel pipe, and a plurality of anchor reinforcing bars embedded in the axial direction of the concrete tubular body, in the SC pile driven underground, from the end face to a predetermined length. The steel pipe can be removed by cutting and / or the concrete of the concrete tubular body can be disassembled to expose the anchor reinforcing bar, and the footing can be supported and fixed by using the anchor reinforcing bar, thus improving the reliability in construction.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II.

FIG. 3 is a cross-sectional view showing one construction state thereof.

FIG. 4 is a sectional view of another embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV.

FIG. 6 is a cross-sectional view showing a construction state of a conventional SC pile.

[Explanation of symbols]

 1 SC pile 1a Steel pipe 2 Concrete tubular body 3 Anchor rebar

Claims (5)

[Claims] 1. An SC pile comprising a steel pipe, a concrete tubular body cast on the inner peripheral surface of the steel pipe, and a plurality of anchor rebars axially embedded in the concrete tubular body. . 2. The steel pipe pile according to claim 1, wherein the steel pipe is covered over the entire length of the concrete tubular body. 3. The steel pipe covers the remaining portion of the concrete tubular body by exposing the concrete tubular body from its end surface over a predetermined length. SC pile. 4. The SC pile according to claim 2 is driven into the ground until the distance from the end face to the upper surface of the leveling concrete on the ground reaches a predetermined length, and the leveling of the leveling concrete is reduced. The steel pipe from the upper side to the end surface is cut and removed, and the concrete of the concrete tubular body at the removed portion of the steel pipe is dismantled to expose the plurality of anchor rebars. Construction method. 5. The SC pile according to claim 3, wherein the exposed portion of the concrete tubular body is upward, and the end of the steel pipe is located slightly above the upper surface of the leveling concrete on the ground. A method for constructing an SC pile, which is characterized in that the concrete of the exposed portion is disassembled to expose the plurality of anchor rebars.