JP3236719B2 - Freezing prevention structure of foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing frost heave of a foundation, and more particularly, to a structure for preventing frost heave of a foundation beam even if the foundation beam is provided at a position shallower than the freezing depth. It relates to a frost heave prevention structure.

[0002]

2. Description of the Related Art Conventionally, the foundation of a building has been constructed as follows. In other words, to prevent the foundation from freezing,
The roots were cut deeper than the freezing depth to form a split chestnut ground, etc., and a concrete formwork for pouring concrete for forming a foundation was formed, and then concrete was poured and cured to form a foundation.

On the other hand, as a means for quickly constructing a foundation today, the following has been adopted.
In other words, the foundation beams that constitute the foundation and the foundation base that supports the foundation beams from below are manufactured in advance in the factory, and they are carried to the construction site to perform root cutting, splitting, etc. The foundation is quickly formed by installing it on the ground. Even in such cases, the roots were cut deeper than the freezing depth, and splittering was performed in order to prevent the foundation from freezing. In this way, the means of prefabricating the components of the foundation in advance is adopted when the construction site is in a cold area and the construction period is extremely limited to avoid freezing of the concrete during curing. Therefore, it was intended to be able to perform construction promptly regardless of such restrictions.

[0004]

However, in the conventional foundation structure as described above, in order to prevent the foundation from freezing, the root is cut deeper than the freezing depth, and the splittering business is performed. This has to be very troublesome, especially in cold regions, where the freezing depth is deep, so that the work is remarkable. Furthermore, since the freezing depth is deep, the height of the foundation has to be formed high, and the amount of concrete for forming the foundation has to be very large.

[0005] Further, even when foundation beams and foundation floors are manufactured in a factory in advance, and they are carried to the construction site for construction, as in the above-mentioned case, the height is adjusted so as to correspond to the freezing depth. Since a high foundation beam is required, it is an unavoidable problem that the amount of concrete for forming the foundation beam becomes large. On the other hand, if only the foundation bottom is installed at the freezing depth position, and the foundation beam is installed at a position shallower than the freezing depth, it is necessary to cut deeper than the freezing depth and perform the work of splittering, etc. The effort required to form the corresponding foundation beam is reduced, and the frost heave of the foundation bottom can be prevented, but the frost heave of the foundation beam cannot be prevented by the freezing and expansion of the soil immediately below the foundation beam.

As described above, in the conventional foundation structure, in order to prevent the foundation from frost heaving, the foundation must be formed at a position deeper than the freezing depth, and the above-mentioned problems cannot be avoided. Was something. Therefore, the present invention has been made to solve the above problems. That is, the object of the present invention is to prevent the frost heave of the foundation beam even when the foundation beam is constructed at a position shallower than the freezing depth,
An object of the present invention is to provide a structure for preventing frost heave of a foundation, which can reduce the labor and the amount of concrete used for the foundation.

[0007]

According to a first aspect of the present invention, there is provided a structure for preventing frost heave of a foundation, comprising: a foundation beam (10) formed in a rectangular parallelepiped shape; and a foundation bottom (10) for supporting the foundation beam (10) from below. 20)
And a frost heave absorbing member provided between an installation ground surface (30) on which the base bottom (20) is to be installed and the lower surface of the foundation beam (10).
(40) the frost heave prevention structure of a foundation comprising:
The beam (10) and the foundation floor (20) are formed separately, and the lower surface of the foundation floor (20) is at least at a position deeper than the freezing depth, and the upper surface of the foundation floor (20) is at a position shallower than the freezing depth. And the frost heave absorbing member (40) is formed to be extendable and contractible in the vertical direction.

A frost heave prevention structure of a foundation according to a second aspect is a technical limitation of the frost heave prevention structure of the foundation according to the first aspect, and the frost heave absorption member (40) is formed of a rubber elastic body. In addition, a hollow portion (44) is provided inside the frost heave absorbing member (40), and the hollow portion (44) is further provided with air or a foam material.

[0009]

According to the first aspect of the present invention, the following operation is achieved through the following construction procedure. First, the construction procedure will be described. First, in order to form an installation ground surface (30) capable of preventing the frost heaving of the foundation bottom (20), rooting, splitting, and the like are performed at a depth equal to or deeper than the freezing depth. If necessary, cast-out concrete will be cast at the installation location of the foundation bottom (20).

Then, the base floor (20) is installed at a predetermined position on the installation ground surface (30) formed as described above. Next, between the installed plurality of base floors (20),
A frost heave absorbing member (40) is placed at a position corresponding to immediately below (10). Finally, the foundation beam (10) is installed on the foundation floor (20) so as to span the plurality of installed foundation floors (20). That is, the frost heave absorbing member (40) is provided immediately below the foundation beam (10).

After the foundation has been formed in this way,
Predetermined portions of the foundation floor (20) and the foundation beams (10) are buried underground. Next, the function of the present invention will be described. In winter, when the soil below the frost heave absorbing member (40) expands due to freezing and froze, the frost heave absorbing member (40) is compressed from below by frost heaving of the soil. In such a case, the frost heave absorbing member (40) is formed so as to be able to expand and contract in the vertical direction, so that the frost heap absorbing member (40) crushes itself and absorbs the frost heave of the soil. Therefore, the foundation beam (10) is prevented from frost heave by the interposition of the frost heave absorbing member (40).

On the other hand, when the frost heave of the soil is completed, as the soil returns to the original state, the collapse of the frost heave absorbing member (40) also recovers and returns to the original shape. As described above, the frost heave absorbing member (40) expands and contracts every time the frost heaves of the soil occurs, and the frost heave of the foundation beam (10) can be prevented by absorbing the frost heave of the soil.

According to the frost heave prevention structure of the foundation of the second aspect, the function of the frost heave prevention structure of the first aspect is exhibited, and the frost heave absorption member (40) is made of an elastic body made of rubber. Because it is formed, waterproofness can be ensured even when buried underground. Also, a hollow portion (44) is
Further, since the hollow portion (44) is provided with air or a foam material, its elasticity can be secured by a simple configuration.

[0014]

The following embodiment corresponds to an embodiment of the second aspect of the present invention. The configuration of the embodiment will be described with reference to FIGS. Here, FIG. 1 is a partial plan view according to the present embodiment. FIG. 2 is an AA vertical sectional view according to the embodiment of FIG.

The structure for preventing frost heave of a foundation according to the present embodiment includes a foundation beam 10, a foundation bottom 20 for supporting the foundation beam 10 from below, an installation ground surface 30 on which the foundation bottom 20 is installed, and the foundation And a frost heave absorbing member 40 provided between the beam 10 and the beam 10. Hereinafter, each of the above members will be described in more detail.

The base bottom 20 is formed in the same manner as the conventional one, is formed in a rectangular parallelepiped shape of concrete at a predetermined height, and functions as an independent base. The base floor 20 is installed at a predetermined position on an installation ground surface 30 where the root is cut off at the same or deeper than the freezing depth in order to prevent frost heaving or the like. Foundation beam 10
Is also formed in the same manner as the conventional one, and is formed in a rectangular parallelepiped shape of concrete at a predetermined height.
It is placed in such a way that it is hung over. Said
The position of the lower surface and the upper surface of the foundation bottom 20 will be described.
And the lower surface is at least a position deeper than the freezing depth,
The upper surface is located at a position shallower than the freezing depth.

The frost heave absorbing member 40 is formed of an elastic material made of rubber and has a hollow portion 4 inside the frost heave absorbing member 40.
4, air is sealed in the hollow portion 44,
It is formed so that it can expand and contract in the vertical direction. The frost heave absorbing member 40 thus formed is placed so as to be located between the installation ground surface 30 and the foundation beam 10. That is, if the frost heave absorbing member 40 is not placed, the space formed between the installation ground surface 30 and the foundation beam 10 is originally
It is a portion occupied by soil, and the frost heave absorbing member 40 fills the space in place of the soil. Therefore, the soil cannot directly freeze the foundation beam 10.

Next, the construction procedure and operation of the embodiment of the present invention having such a configuration will be described with reference to the illustrated examples. First, the construction procedure of the embodiment will be described.
That is, first, in order to form the installation ground surface 30 that can prevent the frost heaving of the foundation bottom 20, rooting and splitting are performed at the same depth or deeper than the freezing depth. In addition, if necessary, a cast-in-place concrete is cast in the installation position of the foundation bottom board 20.

Then, the base floor 20 is installed at a predetermined position on the installation ground surface 30 formed as described above. Next, the frost heave absorption member 40 is placed at a position between the installed plurality of foundation bottoms 20 and directly below the foundation beam 10. Lastly, the foundation beam 10 is installed on the foundation floor 20 so as to bridge between the installed plurality of foundation floors 20. That is, the frost heave absorbing member 40 is provided immediately below the foundation beam 10.

After the foundation has been formed in this way,
Predetermined portions of the foundation floor 20 and the foundation beam 10 are buried in the ground. Next, the operation of the present embodiment will be described. In the winter season, when the soil below the frost heave absorbing member 40 expands due to freezing and froze, the frost heave absorbing member 40 is compressed from below by frost heaving of the soil. In such a case, since the frost heave absorbing member 40 is provided with the hollow portion 44 and is formed to be able to expand and contract in the vertical direction, the frost heap absorbing member 40 itself collapses and absorbs the frost heave of the soil. Therefore, the frost heave absorbing member 4
Since the 0 is interposed, the foundation beam 10 is free from frost heave. On the other hand, when the frost heave of the soil is completed, as the soil returns to the original state, the frost heave absorbing member 40
Is restored and the shape returns to its original shape.

As described above, the frost heave absorbing member 40 expands and contracts every time the frost heave of the soil occurs, and the frost heave of the soil can be prevented by absorbing the frost heave of the soil. Next, effects according to an embodiment of the present invention will be described. As described above, since the frost heave absorbing member 40 is formed so as to be able to expand and contract in the vertical direction, the frost heave absorbing member 40 expands and contracts every time the frost heaves the soil, and absorbs the frost heave of the soil, so that the frost heave of the foundation beam 10 is formed. Can be prevented. In addition, since the frost heave absorption member 40 is formed as an elastic body made of rubber, waterproofness can be secured at the same time. In particular, today, when various rubbers having high durability are being developed, their selection and availability are easy.

By providing the frost heave absorbing member 40, frost heave of the foundation beam 10 can be prevented even when the foundation beam 10 is provided at a position shallower than the freezing depth. As a result, only the frost heaving of the base floor 20 needs to be prevented, so that the root cutting depth can be set at about the freezing depth, and the labor required for the root cutting operation and the like can be reduced as compared with the related art.

Further, the height of the foundation beam 10 to be formed can be made lower than before, and the required amount of concrete can be reduced, which can contribute to cost reduction. Therefore, as described above, even when the foundation beam 10 is constructed at a position shallower than the freezing depth, it is possible to prevent the frost heave of the foundation beam 10 and to reduce the labor for construction of the foundation and the amount of concrete used. It is possible to provide an antifreezing structure of the foundation as possible.

Next, variations of the present invention will be described. In the above-described embodiment, the hollow portion 44 is provided inside the frost heave absorbing member 40, and the hollow portion 44 is filled with air to be formed so as to be able to expand and contract in the vertical direction. A foam material such as foam beads can be enclosed. Further, in the above embodiment, the frost heave absorbing member 40 is made of rubber. However, it is also possible to make the frost heave absorbing member 40 made of a waterproof cloth to ensure waterproofness, and to put foam beads into the hollow portion 44 to have elasticity. .

An embodiment according to the first aspect of the present invention will be provided unless the frost heave absorbing member is made of a rubber elastic body and has a technical limitation such as having a hollow portion. In this case, if the frost heave absorbing member can be formed so as to be able to expand and contract in the vertical direction and is made of a material suitable for being buried in the ground, it goes without saying that the configuration and the material are not limited. .

[0026]

According to the first and second aspects of the present invention, even when the foundation beam is constructed at a position shallower than the freezing depth, it is possible to prevent the foundation beam from frost heaving and to perform the work for constructing the foundation. It is possible to provide a foundation freezing prevention structure capable of realizing a reduction in the amount of concrete used.

In particular, according to the second aspect of the present invention, since the frost heave absorbing member is formed of an elastic body made of rubber, waterproofness can be ensured even when buried in the ground, and the hollow portion is formed. Equipped with air or foam in the hollow part,
It is possible to provide a foundation freezing prevention structure capable of ensuring its elasticity with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a partial plan view according to an embodiment.

FIG. 2 is an AA vertical sectional view according to the embodiment of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Foundation beam 20 Foundation bottom 30 Installation ground surface 40 Frost-absorbing member 44 Hollow part

Claims (2)

(57) [Claims] 1. A base beam formed in a rectangular parallelepiped shape, a base bottom for supporting the base beam from below, and a base beam located between an installation ground surface on which the base bottom is installed and the lower surface of the base beam. A frost heave prevention structure for a foundation provided with a provided frost heave absorbing member, wherein the foundation beam and the foundation bottom are separately formed, and the lower surface of the foundation bottom is at least at a position deeper than the freezing depth. A frost heave prevention structure of a foundation, characterized in that the upper surface is provided at a position shallower than the frost depth and the frost heave absorbing member is formed so as to be able to expand and contract vertically. 2. The frost heave absorbing member is formed of an elastic body made of rubber, a hollow portion is provided inside the frost heave absorbing member, and the hollow portion is provided with air or a foam material. Item 4. The frost heave prevention structure for a foundation according to Item 1.