JPH07158101A - Frost heaving prevention construction of foundation - Google Patents

Abstract

PURPOSE:To prevent the frost heaving of a footing beam even if the footing beam is executed at a position shallower than frost penetration depth and, at the same time, to enable the reduction of man-power used for construction of the foundation and the mount of concrete to be used. CONSTITUTION:Frost heaving prevention construction is equipped with a footing beam (10), a foundation bed (20) bearing the footing beam (10) from the bottom and a frost heaving absorption member (40) placed between an installation ground surface (30) installing the foundation bed (20) and the footing beam (10). The foundation bed (20) is set at least in a position deeper than frost penetration depth and, at the same time, the frost heaving absorption member (40) is formed in the vertical direction in an expansible manner. The frost heaving absorption member (40) is formed of rubber elastic body, at the same time, a hollow section (44) is provided to the inside of the frost heaving absorption member (40), and air is sealed in the hollow section (44).

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 rise of a foundation, and more particularly, to a structure of a foundation for preventing frost rise of a foundation beam even if the foundation beam is provided at a position shallower than the frost depth. It relates to an anti-freezing structure.

[0002]

2. Description of the Related Art Conventionally, building foundations have been constructed as follows. That is, in order to prevent frost heave of the foundation,
The foundation was formed by cutting roots deeper than the freezing depth and doing split chestnut works, forming a predetermined formwork for pouring concrete for foundation formation, and then pouring and curing concrete.

[0003] On the other hand, the following means have been adopted as a means for quickly constructing a foundation today.
That is, the foundation beams, which are the members that make up the foundation, and the foundation bottom plate that supports the foundation beams from below are manufactured in advance in the factory, and these are brought into the construction site to perform root cutting and split chestnut works. The foundation is quickly formed by installing it on the ground. Even in such cases, in order to prevent frost heave of the foundation, root cutting was performed deeper than the depth of freezing and split chestnut works were performed. In this way, the method of factory-manufacturing the components of the foundation in advance is adopted because the construction period is extremely limited in order to avoid freezing of concrete during curing when the construction site is cold. Therefore, the purpose was to enable quick construction regardless of such restrictions.

[0004]

However, in the conventional foundation structure as described above, in order to prevent frost heave of the foundation, root cutting is performed deeper than the freezing depth to perform split chestnut works. This is very time-consuming, and especially in a cold region, the depth of freezing is deep, so the above-mentioned time-consuming work is significant. Further, since the freezing depth is deep, it is necessary to form a high height of the foundation, and the amount of concrete for forming the foundation must be considerably large.

Further, even when the foundation beams and the foundation bottom plate are manufactured in advance in the factory and are carried into the construction site for construction, as in the above case, it is necessary to increase the height to cope with the freezing depth. Since a foundation beam having a high height 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 floor plate 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 the root deeper than the freezing depth to save labor and freezing depth. Although the time and effort to form the corresponding foundation beam can be reduced and the frost heave of the foundation floor can be prevented, the frost heave of the foundation beam cannot be prevented due to the freezing and expansion of the soil directly below the foundation beam.

As described above, in the conventional foundation structure, in order to prevent frost heave of the foundation, the formation position of the foundation must be deeper than the freezing depth, and the above problems cannot be avoided. It was a thing. 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 constructing the foundation beam at a position shallower than the frost depth,
It is to provide a frost heave prevention structure for a foundation that can reduce the labor for constructing the foundation and reduce the amount of concrete used.

[0007]

[Means for Solving the Problems] The structure for preventing frost rise of a foundation according to claim 1 comprises a foundation beam (10), a foundation bottom plate (20) for supporting the foundation beam (10) from below, and the foundation thereof. A frost heave prevention structure for a foundation comprising an installation ground surface (30) for installing a bottom board (20) and an frost heave absorbing member (40) provided between the foundation beam (10), which is a foundation bottom board. The lower surface of (20) is provided at a position deeper than at least the freezing depth and the frost heave absorption member (4
It is characterized in that (0) is formed to be vertically expandable.

According to a second aspect of the frost protection structure of the present invention, the foundation frost protection structure of the first aspect is technically limited, and the frost absorption member (40) is formed of a rubber elastic body. In addition, the frost heave absorption member (40) is provided with a hollow portion (44) inside, and the hollow portion (44) is further provided with air or a foam material.

[0009]

According to the first aspect of the 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 frost heave of the foundation floor (20), root cutting and split chestnut work are performed at the same depth as or deeper than the freezing depth. It should be noted that, if necessary, waste concrete is poured at the installation position of the foundation bottom plate (20).

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

After the foundation is formed in this way,
Predetermined portions of the foundation floor (20) and foundation beam (10) are buried in the ground. Next, the function of the present invention will be described. In the winter, when the soil below the frost heave absorbing member (40) expands due to freezing and frost heaves, the frost heave absorbing member (40) is compressed from below due to the frost heave of the soil. In such a case, since the frost heave absorbing member (40) is formed to be vertically expandable and contractible, it collapses itself and absorbs the frost heave of the soil. Therefore, the foundation beam (10) is protected from frost heave by interposing the frost heave absorbing member (40).

On the other hand, when the frost heave of the soil is completed, the collapse of the frost heave absorbing member (40) is recovered and the original shape is restored as the soil returns to its original state. As described above, whenever the frost heave of the soil occurs, the frost heave absorbing member (40) expands and contracts to absorb the frost heave of the soil, thereby preventing the frost heave of the foundation beam (10).

According to the foundation anti-frost protection structure of claim 2, the foundation anti-frost protection structure described in claim 1 can be achieved, and the anti-frost absorption member (40) is made of a rubber elastic body. Since it is formed, the waterproof property can be secured even if it is buried in the ground. In addition, the hollow part (44) is provided inside the frost heave absorbing member (40).
Since the hollow portion (44) is provided with air or a foam material, the stretchability can be ensured with a simple configuration.

[0014]

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

The anti-frost protection structure for a foundation according to the present embodiment comprises 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. The frost heave absorption member 40 is provided so as to be located between the beam 10 and the beam 10. The above members will be described in more detail below.

The foundation bottom plate 20 is formed in the same manner as the conventional one, is formed of concrete in the shape of a rectangular parallelepiped, and functions as an independent foundation. In order to prevent frost heave, the foundation floor 20 is cut at the same depth as the freezing depth or deeper than the freezing depth, and is installed at a predetermined position on the installation ground surface 30 where split chestnut works and the like are performed. Foundation beam 10
Is also formed in the same manner as the conventional one, and is formed of concrete into a rectangular parallelepiped shape having a predetermined height.
It is placed so that it can be hung on top of.

The frost heave absorption member 40 is formed of an elastic body made of rubber, and the hollow portion 4 is provided inside the frost heave absorption member 40.
4, air is enclosed 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 absorption 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 absorption 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 one embodiment of the present invention having such a structure will be described with reference to the drawings. First, the construction procedure of the embodiment will be described.
That is, first, in order to form the installation ground surface 30 capable of preventing the frost heave of the foundation bottom plate 20, root cutting and split chestnut works are performed at the same depth as the freezing depth or deeper than the freezing depth. In addition, if necessary, concrete is thrown into the installation position of the foundation bottom plate 20.

Then, the foundation bottom plate 20 is installed at a predetermined position on the installation ground surface 30 formed as described above. Next, the frost heave absorbing member 40 is placed at a position between the plurality of installed base bottom plates 20 and immediately below the base beam 10. Finally, the foundation beam 10 is installed on the foundation bottom plate 20 so as to be bridged over the plurality of installed foundation bottom plates 20. That is, the frost heave absorbing member 40 is provided immediately below the foundation beam 10.

After the foundation is formed in this way,
Predetermined portions of the base bottom plate 20 and the base beam 10 are buried in the ground. Next, the operation of this embodiment will be described. In the winter, when the soil below the frost heave absorption member 40 expands due to freezing and frost heaves, the frost heave absorption member 40 is compressed from below due to frost heave of the soil. In such a case, since the frost heave absorbing member 40 includes the hollow portion 44 and is formed to be vertically expandable and contractible, it collapses itself and absorbs the frost heave of the soil. Therefore, the frost heave absorption member 4
Since 0 is interposed, the foundation beam 10 is protected from freezing. On the other hand, when the frost heave of the soil is completed, the frost heave absorbing member 40 is returned as the soil returns to its original state.
The crushed shape will be restored and it will return to its original shape.

As described above, whenever the frost heave of the soil occurs, the frost heave absorbing member 40 expands and contracts to absorb the frost heave of the soil, whereby the frost heave of the foundation beam 10 can be prevented. Next, the effect of the embodiment of the present invention will be described. As described above, since the frost heave absorption member 40 is formed to be vertically expandable and contractible, the frost heave absorption member 40 expands and contracts every time frost heaves on the soil and absorbs the frost heave of the soil, so that the frost heave of the foundation beam 10 is increased. Can be prevented. Since the frost heave member 40 is formed as an elastic body made of rubber, it is possible to ensure waterproofness at the same time. In particular, today, various rubbers having high durability have been developed, and it is easy to select and obtain them.

Further, by providing the frost heave absorbing member 40, it is possible to prevent frost heave of the foundation beam 10 even when the foundation beam 10 is provided at a position shallower than the frost depth. As a result, it is necessary to prevent only the frost heave of the base bottom plate 20, so that the root cutting depth can be set to about the freezing depth, and the labor required for the root cutting work 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 in the prior art, and the required concrete amount 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, frost heave of the foundation beam 10 can be prevented, and the labor for constructing the foundation and the reduction in the amount of concrete used are realized. It is possible to provide a base anti-icing structure that enables the above.

Next, variations of the present invention will be described. In the above-mentioned embodiment, the frost heave absorption member 40 is provided with the hollow portion 44, and air is enclosed in the hollow portion 44 so as to be expandable and contractible in the vertical direction. A foam material such as foam beads can also be enclosed. Further, in the above embodiment, the frost heave absorbing member 40 is made of rubber, but it is also possible to make it waterproof by making it waterproof and make the hollow portion 44 expandable by placing foam beads. .

Unless the technical limitation such that the frost heave member is made of a rubber elastic body and a hollow portion is provided, an embodiment of the invention described in claim 1 is provided. In this case, needless to say, the configuration and the material are not limited as long as the frost heave absorbing member can be formed to be vertically expandable and contractible and is made of a material suitable for being buried in the ground. .

[0026]

According to the inventions of claims 1 and 2, even when the foundation beam is constructed at a position shallower than the freezing depth, it is possible to prevent the foundation beam from icing up, and the labor of constructing the foundation is increased. It is possible to provide a foundation anti-icing structure that can reduce the amount of concrete used.

In particular, according to the second aspect of the invention, since the frost heave absorbing member is formed of an elastic body made of rubber, it is possible to ensure waterproofness even when it is buried in the ground, and the hollow portion is formed. In order to provide air or foam in the hollow part,
It is possible to provide a basic anti-icing structure that can ensure its elasticity with a simple structure.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view taken along the line AA according to the embodiment of FIG.

[Explanation of symbols]

10 Foundation Beam 20 Foundation Bottom 30 Installation Ground Surface 40 Freeze Absorption Member 44 Hollow Part

Claims (2)

[Claims] 1. A foundation beam, a foundation bottom for supporting the foundation beam from below, and a frost heave absorbing member provided between the foundation beam for installing the foundation bottom and the foundation beam. An anti-frost protection structure for a foundation, comprising a bottom bottom plate provided at a position deeper than at least a freezing depth, and a frost-absorption absorbing member vertically expandable and contractible. 2. The frost heave absorbing member is formed of a rubber elastic body, and a hollow portion is provided inside the frost heave absorbing member, and the hollow portion is provided with air or a foam material. Item 1. The structure for preventing frost rise of the foundation according to item 1.