JP3826356B2 - Building foundation structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure suitable for application to a building structure such as a refrigeration warehouse where a sufficient heat insulating performance is required for the floor of the first floor, particularly a floor of a building.
[0002]
[Prior art]
As is well known, building foundations include various foundations such as solid foundations and footing foundations, and pile foundations such as support piles and friction piles, which are optimal for the size of the building and the ground conditions. Is adopted.
[0003]
By the way, in a building where sufficient insulation performance is required for the first floor, such as a large-scale refrigerated warehouse, it is necessary to prevent heat loss from the first floor slab to the ground and ground freezing. For this reason, the structure shown in FIG. 2 is generally adopted as the foundation of this type of building. FIG. 2 shows a case of a pile foundation, in which a group pile composed of four piles 2 is provided at the position of the pillar 1, a footing 3 is provided on the pile head, and a foundation beam 4 is provided between the footings 3. In addition, a foundation beam 5 is provided between the foundation beams 4, a floor pit 7 is secured below the floor slab 6 on the first floor, and a heat insulating material 8 is provided on the lower surface side of the floor slab 6. Reference numeral 9 is a crushed crushed stone layer, and 10 is discarded concrete.
[0004]
In the foundation of the above structure, in addition to providing the heat insulating material 8 on the lower surface side of the floor slab 6, the underfloor pit 7 functions as an air layer so that excellent heat insulating performance can be secured. In addition, troublesome reinforcement work and formwork work are required, and the foundation beam 4 and foundation are secured in order to ensure air permeability in the underfloor pit 7 because the foundation beam 4 and the foundation beam 5 are provided in a lattice shape. It is necessary to provide the small-diameter beam 5 with a large-diameter air hole 11, so that the construction is inevitably complicated as a whole.
[0005]
Therefore, as shown in Patent Document 1 and Patent Document 2, for example, the foundation beam is not provided in a lattice shape but is provided only in one direction, thereby simplifying the structure and ensuring the air permeability of the underfloor pits. It is also proposed that [0006]
[Patent Document 1]
JP 52-106611 A [Patent Document 2]
JP-A-53-33455 [0007]
[Problems to be solved by the invention]
However, simply providing the foundation beam in one direction does not always sufficiently simplify the structure and rationalize the construction compared to the conventional foundation, and therefore, it can be further simplified and rationalized. The most suitable foundation structure was sought for the kind of building.
[0008]
[Means for Solving the Problems]
In view of the above circumstances, the invention of claim 1 is the foundation of a reinforced concrete structure in which the width dimension is a flat rectangular section larger than the height dimension and has the same sectional shape over the entire length. a plurality arranged so as to extend the structure in one direction, as well as erection of the first floor of the floor slab between the upper cross their basic structure, to ensure underfloor pits between foundation structure each other, said base In the lower part of the structure, a number of piles supporting the upper structure via the foundation structure are distributed and arranged along one direction in which the foundation structure extends. .
[0011]
The invention of claim 2 is characterized in that, in the structure of the foundation of the building of the invention of claim 1 , a heat insulating material is integrally driven into the lower surface side of the floor slab on the first floor.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment in which the present invention is applied to a building that uses a refrigerated warehouse.
[0013]
In the building in the present embodiment, as in the case of this type of conventional general building, by providing the under floor pit 7 below the floor slab 6 on the first floor and providing the heat insulating material 8 on the lower surface side of the floor slab 6, The heat insulation performance of the floor on the first floor is secured, thereby preventing heat loss and ground freezing from the floor slab 6. In this embodiment, a plurality of parallel reinforced concrete foundation structures 20 having the functions of the footing 3 and the foundation beam 4 in the conventional general foundation shown in FIG. 2 extend in only one direction. The underfloor pit 7 is secured between the foundation structures 20 and the first floor slab 6 is directly installed between the upper portions of the foundation structures 20. Reference numeral 21 is a floor reinforcement, and 22 is a reinforcing bar in the foundation structure 20.
[0014]
The foundation structure 20 has a flat rectangular cross section in which the width dimension is larger than the height dimension , and the cross-sectional shape is the same over the entire length of the foundation structure 20. A large number of piles 2 are arranged in a line along the length direction of the foundation structure 20 (that is, one direction in which the foundation structure 20 extends) . In the conventional general pile foundation as shown in FIG. 2, it is normal that a plurality of piles 2 are aggregated and provided as a group pile at the position of the pillar 1, but in this embodiment, a large number of piles 2 are used as a group pile. Instead of providing them, they are distributed along the foundation structure 20 (that is, at a predetermined interval) and arranged in a row, so that the footing 3 is not specially provided as in the prior art, and the foundation structure 20 is provided by these piles 2. It is possible to support the superstructure without any trouble.
[0015]
The heat insulating material 8 provided on the lower surface side of the floor slab 6 also serves as a formwork for forming the floor slab 6. That is, when the floor slab 6 is constructed, a steel casting formwork 23 (so-called F deck can be suitably employed) is adopted, and a heat insulating material 8 is laid thereon, and concrete is placed thereon. By installing, the floor slab 6 is formed, and at the same time, the heat insulating material 8 is integrally driven into the lower surface side thereof. However, this is not necessarily the case, and the heat insulating material 8 may be retrofitted after the floor slab 6 is constructed.
[0016]
In the foundation of the present embodiment, the footing 3 and the foundation beam 4 in the foundation of the conventional general structure as shown in FIG. 2, the floor beam and the bundle wall provided to support the floor slab 6 as necessary. The foundation structure 20 has all the functions of itself (in other words, the foundation structure 20 is designed to have all the functions of the footing 3, the foundation beam 4, the floor beam and the bundle wall). Therefore, the structure is remarkably simplified as compared with a conventional general foundation in which they are individually provided, and the construction can be performed much more easily.
[0017]
In particular, the conventional general foundation requires complicated reinforcement work and formwork around the footing 3, but in this embodiment , the foundation structure 20 has the same cross section over the entire length in order to arrange the piles 2 in a row. Since it is only necessary to provide a flat rectangular cross-section, the bar arrangement work and the formwork work are simplified at each stage as compared with the case where the footing 3 is specially provided, and the construction can be rationalized sufficiently. it can.
[0018]
Further, since the foundation structures 20 are only arranged in one direction, the underfloor pits 7 are not divided into a lattice shape unlike a conventional general foundation in which the foundation beams 4 are arranged in a lattice shape. The air permeability of the entire pit 7 can be naturally secured, and naturally there is no need to provide the air holes 11 in the foundation beam 4 or the foundation beam 5 as in the prior art. In this respect, the workability is excellent.
[0019]
Furthermore, since the foundation structure 20 has a flat cross section, it can function as a footing without hindrance, and even when the span between the foundation structures 20 is the same as compared with the case where this is a vertically long section, the floor slab 6 The support span is substantially reduced, which is advantageous in terms of securing the rigidity of the floor slab 6, and it is possible to eliminate the need for a beam or a bundle for supporting the floor slab 6.
[0020]
The present invention is optimally applied to a building such as a refrigerated warehouse where sufficient insulation performance is required for the floor on the first floor as in the above embodiment. In any case, the basic structure can be simplified and the construction can be rationalized sufficiently. And like the said embodiment, the base structure 20 is extended in one direction as a flat cross section of the same cross-sectional shape over the whole length, and it is arranged in parallel, and the pile 2 is distributed in the base structure 20 so that it may form a row. However, the present invention is not limited to this, and depending on the use, scale, form, etc. of the building , the heat insulating material 8 is preferably integrally driven into the floor slab 6 . It goes without saying that appropriate design changes including the presence or absence are possible.
[0021]
【The invention's effect】
In the invention of claim 1, a plurality of reinforced concrete foundation structures having a rectangular cross section are juxtaposed so as to extend in one direction, and a floor slab on the first floor is installed between the upper parts of the foundation structures. Since the underfloor pits are secured between the foundation structures , the foundation structure can be combined with the functions of footing, foundation beams and floor beams on the first floor, so the structure is much simpler than conventional foundations. Therefore, the construction can be rationalized sufficiently, and the air permeability and heat insulation of the underfloor pit can be secured by itself.
[0022]
In particular, since a large number of piles are distributed and arranged along the length of the lower part of the foundation structure , there is no need to provide special footings as in the case where a plurality of piles are provided together at the column position. .
[0023]
In addition, since the foundation structure has a flat rectangular cross section with a width dimension that is larger than the height dimension over the entire length , not only can a pile be provided without hindrance in the lower part, it can function as a footing without hindrance, Since the support span of the floor slab is naturally reduced, it is advantageous in securing the rigidity of the floor slab.
[0024]
In the invention of claim 2 , since the heat insulating material is integrally driven into the lower surface side of the floor slab on the first floor, the heat insulation of the floor slab can be secured and the floor slab can be constructed by using the heat insulating material as a driving form. Becomes easy.
[Brief description of the drawings]
FIG. 1 is a diagram showing a basic structure according to an embodiment of the present invention.
FIG. 2 is a diagram showing an example of a conventional general basis.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pillar 2 Pile 3 Footing 4 Foundation beam 5 Foundation beam 6 Floor slab 7 Underfloor pit 8 Heat insulating material 9 Crushed stone layer 10 Waste concrete 11 Vent hole 20 Foundation structure 21 Floor reinforcement 22 Reinforcement 23 Steel placement form

Claims (2)

In the basic structure of the building,
A plurality of reinforced concrete foundation structures that have a flat rectangular cross-section with a width dimension larger than the height dimension and the same cross-sectional shape over the entire length so as to extend in one direction. A floor slab on the first floor is installed between the upper parts of the structures, and an underfloor pit is secured between the foundation structures .
A large number of piles supporting the upper structure via the foundation structure are arranged below the foundation structure in a distributed manner along one direction in which the foundation structure extends. The structure of the foundation of a building characterized by The structure of the foundation of a building according to claim 1 , wherein a heat insulating material is integrally driven into the lower surface side of the floor slab on the first floor.

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