JP3027490B2 - Foundation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure, and more particularly to a foundation structure using precast concrete.

[0002]

2. Description of the Related Art In a conventional foundation method, particularly in a direct foundation method, a portion on a ground where a building is to be constructed is cut off, and a formwork for concrete placement is formed on the cut portion. After casting concrete in this formwork and curing it, the formwork was removed to build a foundation.

[0003] When the bearing capacity is low, a pile may be driven into the ground to support the foundation.

[0004]

In the above-mentioned conventional direct foundation method, work such as formwork, concrete casting, and removal of the formwork at the construction site must be performed. In addition, there is a problem that it takes time, the construction period is prolonged by the time spent for building the foundation, and the construction cost also increases.

[0005] In particular, when a foundation is constructed by cast-in-place concrete, there is a problem that a curing period is required, and the construction period is prolonged accordingly.

In addition, when the ground bearing capacity is low, an independent foundation using piles must be used, but it takes time and effort to drive the piles.

Therefore, the prefabricated concrete foundation is used as the direct foundation to be constructed on the ground having a certain ground bearing capacity, thereby shortening the construction period and reducing the cost. In addition, the precast concrete foundation is placed on the bottom and on the base. It is conceivable that the level adjustment is facilitated by dividing and forming the base beam.

[0008] In this case, the foundation beam needs to have a certain length in terms of strength or connection construction, and furthermore, its appearance is preferable.

[0009] However, if the bottom plate is uneven, there is a problem that rattling is apt to occur at the time of installation, and stable installation is difficult.

In addition, if the bottom is long, there is a problem in strength, and there is a problem that the bottom may be broken when a load is applied to the bottom in an installed state.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to shorten the construction period of a foundation structure and reduce costs by using precast concrete, thereby enabling stable installation. Moreover, it is to provide a basic structure capable of sufficiently withstanding a load.

[0012]

[0013]

In order to achieve the above object,
Therefore, a first invention is a foundation structure in which a precast concrete foundation beam having a predetermined length is placed on a precast concrete bottom board, and the bottom board and the foundation beam are connected and integrated by concrete casting. , Said bottom plate,
A bottom part formed shorter than the foundation beam is formed by continuously arranging it at the foundation beam installation position, and each of the bottom parts is formed slightly higher than other positions at the foundation beam installation part. Characterized by having a foundation beam mounting portion.

According to a second aspect of the present invention, the bottom part has a connection hole at an end in the connecting direction, and adjacent bottom parts are connected by a connection fitting inserted into the connection hole. .

[0015]

[0016]

[0017]

[0018]

[Action] In the first invention of the structure, by forming a slightly higher basal beam mounting portion than the other located footing beams installation portion of the bottom plate part, slightly vertical position deviation between the bottom plate parts Even if it is, it can support the foundation beam stably,
Moreover, the level of the foundation beam can be easily adjusted by inserting a liner between the foundation beam mounting portion and the foundation beam.

According to the second aspect of the present invention, the bottom metal parts can be easily temporarily fixed to each other by inserting the connection metal fittings into the connection holes formed in the bottom metal parts.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 are views showing a basic structure according to an embodiment of the present invention.

In this foundation structure, a foundation is constructed by connecting a precast concrete foundation beam 10 and a precast concrete base 12 for mounting and supporting the foundation beam 10 at a construction site.

Precast concrete foundation beam 10
Is, for example, a substantially rectangular shape set to a length of a multiple of 910 mm (3 to 4 times). Further, bulging connecting portions 14 and connecting concave portions 15 for connecting the foundation beams 10 to each other are formed at both ends of the foundation beam 10 on the building indoor side.

Precast concrete bottom plate 12
Is a bottom part 16 having a reference dimension and a bottom part 18 at the intersection losing side which is shorter than the bottom part 16 having the reference dimension.
And the bottom part 20 on the side of the intersection longer than the bottom part 16 of the reference size, which is three types in length, is combined, and is continuously arranged at the installation position of the foundation beam 10 to form. It is supposed to be.

Each of these bottom parts 16, 18, 20
A width sufficiently larger than the thickness of the foundation beam 10, for example, 440 mm
Is set to the width and the bottom part 16 of the standard dimensions is
For example, 900 mm, the bottom part 18 on the losing side is, for example, 6
80mm, winning side bottom part 20 is, for example, 1125mm
Bottom part 1 of the standard dimensions set to each length of
6 and the losing bottom part 18 are 5mm on each side
The bottom part 20 on the winning side can take a 5 mm connection on one side.

Each of the bottom parts 16, 18, 20
A vertical through-hole 22 is formed for concrete wraparound during concrete casting, and this through-hole 22 is communicated by a concave portion 24 formed on the lower surface side, so that each of the bottom parts 16, 18, and 20 is formed by the cast concrete. The cast concrete is held at the lower part of the foundation beam 10 by the projections 26 which are connected and extend in the longitudinal direction on both sides of the upper surface, so that the foundation beam 10 and the bottom parts 16, 18, 20 are connected. .

Further, in each of the bottom parts 16, 18, and 20, a base beam mounting portion 28 is formed at a portion where the base beam 10 is installed between the ridge portions 26 and slightly higher than other positions. The foundation beam 10 is placed on the foundation beam placement section 28 via a liner 30 for level adjustment.

Further, each of the bottom parts 16, 18, 2
0, connection holes 32 are formed at both ends in the upper surface continuous direction,
Both ends of a connection fitting 34 bent in a substantially U-shape are inserted into the connection holes 32 so that adjacent bottom parts 16, 18, 20 can be connected to each other and temporarily fixed.

Next, the construction state of the foundation using the foundation structure of this embodiment will be described.

First, root cutting is performed on the foundation building portion of the ground, and discarded concrete is poured into the root cutting.

Next, bottom parts 16, 18, and 20 made of precast concrete are continuously arranged in the root cutting to form a continuous bottom 12.

In this case, the reference bottom parts 16 are connected to each other in the straight part, and the side of the winning bottom parts 18 is applied to the end face of the losing bottom parts 16 in the corner of the building crossing the L-shape. At the part where they are contacted and connected and intersect in a T-shape, two reference bottom parts 16 are provided.
The end face of the bottom base part 18 on the losing side is brought into contact with the connecting portion of No. 1 to be connected. With such a combination, it is possible to correspond to the length of the foundation beam 10 which is a multiple of, for example, 910 mm.

The connection of the bottom parts 16, 18, and 20 can be performed simply by inserting both ends of a connection bracket 34 bent in a substantially U-shape into a connection hole 32 formed in each of the bottom parts 16, 18, and 20. The temporary fixing is performed easily, easily and in a short time.

Next, a plurality of precast concrete foundation beams 10 are placed on the precast concrete bottom plate 12 and connected in this way.

In this case, the foundation beam 10 is attached to each base part 1
6, 18, and 20, each of which is placed on a foundation beam placing portion 28 formed one by one.
Even if the vertical positions of the base beams 20 are slightly shifted from each other, the liner 3 for level adjustment can be stably supported on the base beams 10 and between the base beams 10 and the bottom parts 16, 18, and 20.
By inserting 0, the level of the foundation beam 10 can be adjusted easily and in a short time.

Each of the foundation beams 10 is connected to the swelling connection portion 1.
A mold (not shown) is attached between the four, and the connecting portion is supported by the mold.

Then, in a state where the foundation beams 10 are continuously provided, concrete is poured into the connection recesses 15 of the connection portions of the foundation beams 10 surrounded by the formwork and the bottom 12.

In this case, the bottom parts 16, 18, 20 are connected to each other by the ridges 26, the recesses 24, and the through holes 22 formed on the upper and lower surfaces of the bottom parts 16, 18, 20, and at the same time, The parts 16, 18, and 20 and the foundation beam 10 are connected by cast concrete. Further, the foundation beams 10 are connected to the concave portions 24 surrounded by the formwork.
It will be connected by concrete poured in.

As described above, concrete can be cast in a state where the foundation beam 10 placed on the bottom board 12 is in a self-standing state, so that it is not necessary to attach and remove a large-scale formwork for concrete placing. The construction period can be shortened accordingly. Also, there is almost no need for a curing period after the concrete is cast, and the construction period can be further shortened.

Then, after the concrete is cast, if the root cut portion is back-filled, the construction of the foundation is completed.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

For example, in this embodiment, the basic structure based on the dimension of 910 mm has been described. However, the present invention is not limited to this example, but can be applied to the basic structure based on the metric unit.

[0043]

[0044]

[0045]

As described above, according to the first aspect of the present invention, by forming a foundation beam mounting portion which is slightly higher than other positions in the foundation beam installation portion of the bottom part, the bottom parts can be connected to each other. Even when the vertical position is slightly shifted, the foundation beam can be supported stably, and the level adjustment of the foundation beam can be easily performed by inserting a liner between the foundation beam mounting part and the foundation beam. is there.

According to the second aspect of the present invention, there is an effect that the bottom parts can be easily temporarily fixed to each other by inserting the connection fitting into the connection hole formed in the bottom part.

[Brief description of the drawings]

FIG. 1 is a plan view showing a basic structure according to an embodiment of the present invention.

FIG. 2 is a plan view showing a reference bottom part.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is an enlarged plan view showing a connection state of a corner portion.

FIG. 6 is a partial perspective view showing a connection state of bottom parts.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Foundation beam 12 Bottom board 16, 18, 20 Bottom board part 28 Foundation beam mounting part 30 Liner 32 Connection hole 34 Connection hardware

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 27/01 101-102

Claims (2)

(57) [Claims] 1. A base structure in which a precast concrete base beam having a predetermined length is placed on a precast concrete base plate, and the base plate and the base beam are connected and integrated by concrete casting. Is formed by continuously arranging a bottom part formed shorter than the foundation beam at the foundation beam installation position, and each of the bottom parts is slightly higher than other positions at the foundation beam installation part. A foundation structure having a formed foundation beam mounting portion. Wherein Oite to claim 1, wherein the bottom plate part has a connecting hole in the continuously provided direction end portion, that the adjacent bottom plate parts to each other are connected by connecting fitting forme difference in the coupling hole Characteristic foundation structure.