JPH0527725B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a reinforced concrete foundation that is the basis of a structure.

[Prior art]

Generally, the types of foundations for structures are divided into two types: direct foundations and pile foundations, based on the method of support. is selected.

Pile foundations have the characteristics of easy reinforcement and high bearing capacity, while direct foundations such as continuous foundations (or cloth foundations) have the characteristics of easy excavation and small eccentricity of column foundations. However, both foundations had shortcomings.
In other words, pile foundations are often made with one column under the column.
In this case, as shown in Fig. 9, the diameter of the pile foundation 1 is large (the axial force is large), and when the column 2 is a peripheral column, the centers of the pile and column 2 are largely misaligned, and the eccentric moment due to eccentricity e increases. Due to this treatment, the reinforcement of the foundation beam 3 increased, which was disadvantageous. In addition, the bearing capacity of direct foundations such as cloth foundations is conventionally limited to a certain value depending on the type of supporting ground, and this value is extremely small compared to pile foundations. For this reason, in order to provide the same strength as a pile foundation, a base that was considerably larger than the cross-sectional area of the pile was required, and a large amount of reinforced concrete was required.

[Purpose of the invention]

This invention was made by focusing on the above-mentioned drawbacks of the conventional foundation. The purpose is to propose a reinforced concrete foundation that can reduce costs by increasing bearing capacity, reducing eccentricity, and improving workability.

[Structure of the invention]

This reinforced concrete foundation consists of multiple reinforced concrete foundation piles erected adjacent to each other and a continuous reinforced concrete foundation with the same width as the reinforced concrete foundation piles and connected at the upper end, and is connected to the top of the reinforced concrete cage of the foundation piles in a lattice pattern. It is characterized by the fact that the reinforcing bars of the continuous foundation that make up the unit are arranged in an overlapping manner.

〔Example〕

In FIG. 1, a cylindrical reinforcing bar cage 6 consisting of vertical bars 4 and circular bars 5 is placed adjacently in the excavated ground,
Concrete 7 is poured and a plurality of reinforced concrete foundation piles 8 are successively erected. In Fig. 1, 7' is the additional concrete pouring part.

A continuous foundation 11 made of reinforced concrete and having the same width (same diameter) as the foundation pile 8 is provided at the upper end of the adjacent foundation pile 8. The reinforcement is arranged as follows. In FIG. 2, a lower lattice-like unit 9 having a U-shaped cross section is placed along the continuous direction of the piles with the U-shaped opening facing upward in a direction orthogonal to the upper end of the foundation pile 8, and the ends are overlapped. Connect with 10. Next, as shown in FIG. 3, two rows of narrow upper lattice units 9, 9' are placed above the U-shaped opening of the lower lattice unit 9, so that the lattice units 9, 9' have a rectangular cross section. None Reinforcement. Here, the lap joints 10' of the upper grid-like unit 9' are offset from the lap joints 10 of the lower part. And the reinforcing bar cage 6 of the foundation pile 8
The reinforcing bars of the lattice units 9 and 9' of the continuous foundation 11 are laid out so that they overlap, and after the reinforcing bars are laid out as described above, concrete 7 is poured to connect the reinforced concrete, the foundation piles 8, and their upper ends. A reinforced concrete foundation consisting of a continuous reinforced concrete foundation 11 is formed.

In the above construction process, reinforcement for the columns and foundation beams is performed after reinforcement for the lower lattice unit 9.

In order to construct a foundation beam on the reinforced concrete foundation constructed in this way, if the cores of the foundation beam and the foundation coincide, the result will be as shown in Figure 4. That is, the lattice reinforcement 12 for the foundation beam with a rectangular cross section is arranged in the center of the bottom of the lower lattice-like unit 9 along the continuous direction of the piles, and at the same time, the reinforcement cage 13 for the column is square cylindrical.
erect and arrange reinforcement, pour concrete 7, and construct foundation beams 3 and columns 2.

In addition, if one side of the foundation beam and the foundation coincide, as shown in Figure 5, lattice reinforcement 12 for the foundation beam with a rectangular cross section is arranged along the pile continuity direction on the outside of the bottom of the lower lattice unit 9. , At the same time, the reinforcing bar cage 1 for the pillar
3. Arrange reinforcement and construct foundation beams and columns. In this concrete foundation, the foundation piles may have a rectangular column shape in addition to a cylindrical shape. When a foundation beam is installed eccentrically on a square columnar foundation pile 8 as shown in Fig. 6, the longitudinal reinforcement 4 of the pile hits the main reinforcement 9 of the foundation beam and interferes with each other to a greater degree than a cylindrical pile. This has the advantage of reducing

Furthermore, the foundation beams 3 can be built with their side edges overlapping each other, like the cylindrical piles shown in FIG. 7a or the quadrangular pillars shown in FIG. 7b. In order to arrange reinforcement by overlapping the side edges, it is done by inserting vertical reinforcements 4 in the overlapped portions after setting the basket reinforcements. This overlapping increases the bearing capacity of the piles and provides the effect that the reinforcing bar cages do not disturb each other during concrete pouring.

FIG. 8 shows an example in which a foundation beam 3 is formed along one side of a reinforced concrete foundation 11 according to the present invention, and a column 2 is provided on one side of the foundation 11. In this case, the foundation pile 8 can be made significantly thinner than the conventional single pile 1 under the column shown in FIG. 9, and the eccentricity e between the core of the column 2 and the core of the foundation 11 is small. becomes. As a result, the eccentric moment is reduced and the reinforcement of the foundation beam can be reduced.

[Action/Effect]

The reinforced concrete foundation of this invention has the above-mentioned structure, in which the foundation piles are built in succession and their upper ends are connected by a continuous foundation, and the reinforcement cage 6 of the foundation pile 8 and the reinforcement of the lattice-like unit of the continuous foundation 11 are connected. Since the reinforcement is arranged in an overlapping manner, the force acting on the foundation is distributed over a large number of foundation piles, and the diameter of the foundation pile can be made significantly smaller than that of the conventional foundation pile with one under the column. In addition, this foundation is a continuous foundation with a pile foundation in which the reinforcement is arranged and a shape similar to that of a direct foundation. It is possible to have excellent functions such as ease of construction and small eccentricity between the column and the foundation, and ease of construction at the same time.

Therefore, this reinforced concrete foundation can increase the bearing strength, reduce eccentricity, and improve workability, resulting in a cost reduction effect.

[Brief explanation of the drawing]

Figures 1a and b, Figures 2a and b, and Figures 3a and b are plan views and vertical sectional views of the upper end showing the reinforcing structure of a reinforced concrete foundation construction example in the order of steps, and Figures 4a and b, Figures 5a and b are longitudinal cross-sectional views and plan views showing the reinforcing conditions when foundation beams and columns are installed on reinforced concrete foundations, respectively, and Figure 6 shows the foundation beams installed on square column piles. Figures 7a and b are cross-sectional views showing the reinforcing arrangement when cylindrical piles and rectangular pillar piles are erected in an overlapping manner, respectively. FIGS. 9a and 9b are a plan view and a side view showing the eccentricity of the foundation of the present invention and the columns of a conventional pile foundation. 1...Pile foundation, 2...Column, 3...Foundation beam, 4...
... Vertical bar, 5... Circular bar, 6... Cylindrical reinforcing bar cage, 7
...Concrete, 8...Reinforced concrete foundation pile, 9,9'...Lower and upper lattice unit,
10, 10'... Lap joint, 11... Continuous foundation.

Claims (1)

[Claims] 1 Consisting of multiple reinforced concrete foundation piles built adjacent to each other and a continuous reinforced concrete foundation with the same width as the reinforced concrete foundation piles and connecting the upper ends, the upper part of the reinforcing bar cage of the foundation piles and the lattice unit are connected. A reinforced concrete foundation characterized by a continuous foundation in which the reinforcing bars are arranged in an overlapping manner.