JPH04228727A - Foundation structure - Google Patents

Abstract

PURPOSE:To increase horizontal strength of a foundation by providing a pile shorter than a bearing pile in the middle of the foundation fixed by the bearing piles provided with a predetermined interval and by fixing an upper end of the pile to a building slab. CONSTITUTION:A pile foundation 3 fixed to a bearing pile 2 is arranged immediately below a column of a building at points in a check pattern. A pile 4 shorter than the bearing pile 2 is stood in the middle of the pile foundation 3, and an upper end of the pile 4 is fixed to a slab 5 of a building. By this, even in the case of a poor ground such as a reclaimed land which requires large horizontal strength, it is not necessary to increase the number of bearing piles 2 or to use piles with high strength. Thus, cost for foundation can be reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure in which the foundation is supported by piles.

0002

BACKGROUND OF THE INVENTION Conventionally, a plurality of support piles were provided to support a pile foundation, and these support piles were made to bear the entire burden of vertical bearing capacity and horizontal bearing capacity during an earthquake.

0003

[Problems to be Solved by the Invention] However, when using the above-mentioned prior art, the horizontal bearing capacity is borne only by the support piles, so in the case of soft ground such as a reclaimed land where a large horizontal bearing capacity is required, the large horizontal bearing capacity is Therefore, it is necessary to either increase the number of support piles or use high-strength piles as support piles.In the former case, the number of support piles increases and the pile foundation As the size increases, it is inevitable that costs will increase and workability will decrease; in the latter case,
Since high-strength piles are expensive, an increase in cost was inevitable. An object of the present invention is to provide a foundation structure that can economically increase horizontal bearing capacity.

0004

[Means for Solving the Problems] A characteristic configuration of the foundation structure according to the present invention is that a pile for increasing the horizontal strength, which is shorter than the support pile supporting the pile foundation, is provided at a location different from the pile foundation. It is in.

[0005]

[Function] The piles for increasing the horizontal bearing capacity are installed independently in a location different from the pile foundation, so when bearing the horizontal bearing capacity, there is no mutual interference with the supporting piles, and the piles are efficiently leveled. It is possible to increase the horizontal bearing capacity and obtain a large horizontal bearing capacity as a whole. Moreover, because the piles are short and there is no need to enlarge the pile foundation, the increase in cost can be kept small compared to the increase in horizontal bearing capacity. Furthermore, even though the piles are used to increase horizontal bearing capacity, the slab is supported at their upper ends, so the bearing capacity required of the supporting piles is reduced accordingly.
It is possible to reduce the cost of support piles.

[0006]

[Effects of the Invention] Therefore, the present invention can provide a basic structure that can suppress an increase in cost due to an increase in horizontal strength as a whole.

[0007]

[Example] As shown in FIGS. 1 and 2, this is a foundation structure in which a pile foundation 3 supported by support piles 2 is provided directly below a column 1, and the pile foundation 3 is provided in the horizontal row A and the vertical row B. Piles 4 for increasing horizontal strength, which are shorter than the support piles 2, are arranged at each of a plurality of grid points different from those above, and the upper ends of these piles 4 are fixed to the slab 5 on the first floor. Both the support pile 2 and the pile 4 are PC piles. The means for fixing the upper end of the pile 4 to the slab 5 is as shown in FIG. 3, by embedding the pile head in the slab 5,
A reinforcing bar 7 embedded in a slab 5 is fixed to a washer 6 of the pile cap, and a reticulated reinforcing bar 8 is arranged in the slab 5. Similarly, the means for fixing the upper end of the support pile 2 to the pile foundation 3 is such that, as shown in FIG. Joint reinforcing bar 7
is fixed to the pile foundation 3, and mesh-shaped reinforcing bars 8 are arranged inside the pile foundation 3. 9 is waste concrete.

[0008] In the above embodiment, a location different from the pile foundation 3 is a location that is not on row A or column B of the pile foundation 3, but it may be a location on row A or column B.

[0009]Although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

[Figure 1] Longitudinal cross-sectional view

[Figure 2] Plan view showing pile arrangement

[Figure 3] Longitudinal cross-sectional view of main parts

[Figure 4] Longitudinal cross-sectional view of main parts

[Explanation of symbols]

3 Pile foundation 2 Support pile ４　Pile

Claims (1)

[Claims] 1. A foundation structure in which a pile (4) for increasing horizontal strength, which is shorter than a support pile (2) that supports the pile foundation (3), is provided at a location different from the pile foundation (3).