JPH0718681A - Connecting method for precast concrete pillar and foundation section - Google Patents

Abstract

PURPOSE:To provide a connection section reducing the execution cost and labor and having no structural weak point by extending a pillar leg section connected to a foundation section to a foundation bottom section, and chipping the concrete at the connection section to an underground beam. CONSTITUTION:After a pile B and the foundation work are completed, a precast concrete pillar A is erected at a prescribed position and temporarily fixed. A pillar leg section is extended to a foundation bottom section, thereby the fixing length of a pillar main reinforcement 1 to the foundation section is assured. The concrete of the pillar leg section connected to the foundation section on the precast concrete pillar A is chipped. The main reinforcement 5 of an underground beam is arranged in the pillar A via the chipping section 3. The auxiliary reinforcement 6 of the underground beam and a footing section are arranged, a formwork is assembled, then concrete is placed on the foundation section. The precast concrete pillar A and the foundation section are integrated at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining precast concrete columns (hereinafter referred to as PC columns) and foundations.

[0002]

2. Description of the Related Art Conventionally, when joining a PC pillar and a foundation,
As shown in FIG. 4, the pillar main bar b is installed at the time of constructing the foundation consisting of the underground beam a and the footing, the concrete of the foundation is placed, and then the column main bar joining sleeve metal c is built in. The PC pillar d is built in, the pillar main bar b is joined to the sleeve metal c of the PC pillar d, and the PC pillar and the foundation are joined by grouting.

In the figure, e is waste concrete and f is a pile.

[0004]

In the above-mentioned prior art, a great deal of labor and cost are required in order to secure the positional accuracy of the column main bars installed in advance on the foundation part. Also, a large amount of cost is required for the column main joint sleeve hardware and grout. Further, when a hinge zone is generated in the column base, there is a possibility that the joint portion of the column main bar becomes a structural weak point.

The present invention has been proposed in view of the problems of the above-mentioned prior art. The object of the present invention is to improve the workability, excel in economic efficiency, and structurally rational PC columns and foundations. The point is to provide a method of joining the parts.

[0006]

In order to achieve the above-mentioned object, according to the method of joining a PC column and a base portion according to the present invention,
After extending the column base that joins with the foundation to the bottom of the foundation and building a precast concrete column that lacks the concrete at the part where the underground beam is connected, the underground beam and footing part. The reinforcement of concrete is done and the concrete of the foundation is poured.

[0007]

According to the present invention, as described above, the column base of the PC column is extended to the bottom of the foundation, the fixing length of the main column of the PC column to the foundation is secured, and the PC column is built. Can be self-reliant when plugged in. Further, since the concrete of the column base portion that joins with the foundation portion of the PC column is cut off, it becomes possible to arrange the main reinforcement of the underground beam in the column through the cutout portion, and the concrete of the foundation part The PC pillar and the base portion are integrated by driving.

[0008]

The present invention will be described below with reference to the illustrated embodiments. A is a hollow PC column in which the column main reinforcement 1 and the column sill 2 are built in, and the concrete of the column base portion which is compatible with the foundation is deleted.
Part of the column main bar 1 and the column ridge bar 2 is exposed in the same cutout portion 3. In the figure, 4 is a hollow part.

After the pile B and the earthwork are finished, the PC pillar A is built in a predetermined position and temporarily fixed by using a pillar, a wire and the like. Next, the footing portion is laid out along with the main reinforcements 5 and the ribs 6 of the underground beam, and then the formwork 7 is assembled and then the concrete of the foundation is placed at the same time as the column base. Thus, the PC pillar A and the base portion are integrated with each other through the cutout portion 3 of the PC pillar A. In the figure, 8 is waste concrete.

In the case of a hollow PC column, concrete can be poured from the column head, and the column cross section may be square or circular.

[0011]

As described above, the present invention is constructed by extending the column base portion where the PC column is joined to the foundation portion to the bottom portion of the foundation and omitting the connection portion with the underground beam. The PC pillar is built in the foundation, the underground beams and footing are laid out, and the concrete of the foundation is placed. The foundation and the PC pillar are integrated through the cutouts of the PC pillar. According to the present invention, since the column main bar is not installed in the foundation in advance, labor and cost for arranging the reinforcing bar are unnecessary, and the sleeve metal for connecting the main bar and the grout are unnecessary. The cost of will be unnecessary. Furthermore, since the joint of the main muscles at the column base is not located, there is no fear that structural weakness due to the joint will occur.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an implementation state of a method for joining a PC column and a base portion according to the present invention.

2 is a cross-sectional plan view of FIG.

FIG. 3 is a perspective view of a PC column.

FIG. 4 is a front view showing an implementation status of a conventional method.

[Explanation of symbols]

 A PC Column B Piles 1 Column main bar 2 Column girder 3 Missing part 4 Hollow part 5 Main beam of underground beam 6 Ribs of underground beam 7 Formwork 8 Waste concrete

Claims (1)

[Claims] 1. A precast concrete column formed by extending a column base portion connecting to a foundation to the bottom of the foundation and removing concrete in an area where an underground beam is connected to the foundation, A method of joining a precast concrete column and a foundation, which comprises placing concrete in the foundation by arranging the center beam and footing.