JPS5991233A - Construction work of reinforced concrete foundation for building - Google Patents

Abstract

PURPOSE:To make easier the chipping operation of concrete by a method in which a cylinder of an expanded material is inserted into the upper iron bar portion of a concrete pile to cover the iron bar portion, and concrete is poured into the surrounding space of the covered portion. CONSTITUTION:A cylinder 2 of an expanded material is inserted into the upper iron bar portion 12 of a concrete pile 1 to cover the iron bar 12 portion, and concrete is poured into the surrounding space of the covered portion to cover the iron bar 12 portion with the concrete. In constructing the upper part of the foundation, the hardened concrete around the covered portion of the iron bars 12 is removed, and the cylinder 2 is removed to expose the iron bars 12 to outside. The presence of the cylinder 2 can prevent the direct adherence of concrete to the iron bars, and therefore, the need to remove the concrete from the iron bars 12 at the time of exposing work can be eliminated and the following work can be made easier.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for a reinforced concrete foundation for a building, and is a method for easily exposing reinforcing bars at the bottom of the foundation while constructing the upper part of the foundation.

Traditionally, in the construction of reinforced concrete foundations for various buildings, if the reinforcing bars at the top of the concrete piles buried underground are left open during the construction period, they may rust or collide with foreign objects. The reinforcing bars were bent due to ◎
For this reason, the reinforcing bars are treated with anti-corrosion treatment and then covered with concrete. When constructing the upper part of the foundation, the concrete in the reinforcing bars is destroyed and removed to expose the reinforcing bars again. The connection is made by welding or the like.

However, when subcontracting the reinforcing bars again, it is difficult to remove the concrete attached to the reinforcing bars, resulting in poor work efficiency and if the concrete remains covered for a long period of time.
There was a problem in that the rust prevention effect of the reinforcing bars deteriorated, causing rust.

Therefore, the present invention provides a method for constructing a reinforced concrete foundation that can solve the above-mentioned conventional problems. into the closet,
After covering the reinforcing bar part, concrete is poured around the covered part to cover it in a circle, and when the upper part of the foundation is constructed, the hardened concrete between the covered parts is removed and the cylindrical body is It is characterized by removing the reinforcing steel to expose the reinforcing steel.

Next, an embodiment of the present invention will be described with reference to the drawings. First, the protruding reinforcing bars (111) at the upper end of the concrete pile (4) buried underground (4) will be explained below.
Connect reinforcing bar α2 for connection by welding, etc. (see Figure 1)
. Next, a cylindrical body (2) made of a foamed resin, preferably foamed polystyrene or foamed polyethylene, is pushed into the connected reinforcing bar (2) to cover the reinforcing bar az (second
(see figure).

A push-through hole (211) is formed inside the cylindrical body (2) IIi, which is approximately the same size as the reinforcing bar az or slightly thinner than the reinforcing bar a, so that the reinforcing bar a can be covered with good adhesion after insertion. .

Then, a concrete formwork (8) is provided along the outer periphery of the cylindrical body (2), concrete 0 is poured into the formwork (8), and the concrete 0 is solidified so that the entire reinforcing bar (121 part) becomes concrete ( Construct a concrete foundation covered by Q (see Figure 4).

Concrete base constructed in this way? #0) is
The upper part of the reinforcing bar O3 is separated from the concrete 0 by the cylindrical body (2) and is strongly protected by the concrete (Q.Then, when constructing the upper part of the foundation, the above The solidified concrete (q) around the area covered by the cylindrical body (2) of the reinforcing bar Q2+ is destroyed and removed, and the cylindrical body is removed to expose the reinforcing bar O2, and the steel frame on the upper part of the foundation is 1z by welding, etc. (C) When removing the reinforcing bar α2
Since there is no concrete adhesion to No. 1, troublesome work such as peeling off of concrete, which was required in the past, can be omitted.

Note that if the cylindrical body (2) has a rectangular cross section (see Figure 2) or a triangular cross section (see Figure 5), the concrete encasing it will crack near the corners of the rectangular cross section, causing reinforcing steel. This is a preferred shape because it facilitates the work of demolishing concrete during the exposure work, but if the cylindrical body (2) itself is made of polyolefin foam such as polyethylene, which has poor adhesion to concrete, the cross section A circular shape (see FIG. 6) or a shape close to this can also be used.

In addition, in the above-mentioned example, a construction method was shown in which concrete is placed in the above-ground and underground parts of the reinforcing steel at the same time, but after concrete is placed in the underground part in advance, There is also an implementation in which concrete is placed separately for the underground part and the above ground part, such as by pushing the cylindrical body (2) into the reinforcing bar α2 of the part and pouring concrete into the above ground part.

According to the method of constructing a concrete foundation according to the present invention as described above, there is no reinforcing bar above the concrete pile (!).
After inserting a foam cylindrical body (2) into part 2 to cover the reinforcing bars (121 part), concrete is poured into the vicinity of the covered part, and the reinforcing bar 02 part is covered with concrete. When constructing the upper part, the solidified concrete around the reinforcing bar covering part is removed and the cylindrical body (2) is removed to expose the reinforcing bars, so from the above cylindrical body (2) K, Direct adhesion of concrete (0) to the reinforcing bars (2) can be prevented, and there is no need to peel the concrete from the reinforcing bars when the reinforcing bars are exposed, resulting in extremely efficient construction. Even if the covered state is maintained, since the reinforcing bar α21 is covered by the cylindrical body (2), there is no adhesion of moisture, etc., and the formation of chains can be effectively prevented.

Furthermore, since the cylindrical body surrounding the reinforcing bar O2 is made of foam, its flexibility makes it easy to insert into the reinforcing bar O2, and also ensures good adhesion to the reinforcing bar Q21. , it is possible to effectively prevent concrete 0 from adhering to the reinforcing bar α2. Moreover, it is convenient to use a foam that has poor adhesion to concrete because it makes the work of demolishing concrete even easier. Furthermore, since the construction is performed using foam, the construction cost is low, and the cost burden is light.

Therefore, it is possible to provide a method for constructing a reinforced concrete foundation for a building that has various excellent effects, such as shortening the construction period and reducing construction costs.

[Brief explanation of the drawing]

The figures illustrate embodiments of the present invention, and Fig. 1 is a sectional view, Fig. 2 is a perspective view of a cylindrical body, Fig. 8 is a perspective view showing construction in progress, and Fig. 4 is a concrete placement. 5 and 6 are perspective views showing modified examples of the cylindrical body. (1)...Concrete pile, 021...Reinforcement bar,
(2)...Cylindrical body, (8)...Concrete formwork,
CB)...Concrete foundation, (C)...Concrete. Patent applicant Sekisui Plastics Co., Ltd. Figure 1 Figure 2
Figure 3

Claims (1)

[Claims] 1. Push a cylindrical body made of foam into the reinforcing bars above the concrete pile to cover the reinforcing bars, then pour concrete around the covered part to cover the surroundings and build the foundation. A method for constructing a reinforced concrete foundation for a building, characterized in that, when constructing the lower part, the solidified concrete on the 8 sides of the envelope s is removed and the cylindrical body is removed to expose the reinforcing bars.