JPH02248528A - Basement structure - Google Patents

Abstract

PURPOSE:To contrive to shorten term or works by constructing a basement structure of an underground upper part formed by excavating the inside part of a foundation in a way that the foundation functions as a retaining wall and an underground lower part formed by excavating the ground at a position drawn near toward the inside from the foundation by specified width and in a depth depper than the foundation. CONSTITUTION:A basement structure is constructed of an upper underground part 1a formed by excavating the inside part of a foundation 2 in a way that the foundation 2 functions as a retaining wall and a lower underground part 1b formed by excavating the ground at a position drawn near toward the inside from the foundation 2 by specified widths and in a depth deeper than the foundation 2. The lower part 1b is provided with a bottom wall 3, retaining walls 4, and bottom boards 5 are installed between the foundation 2 and the retaining walls 4. At the same time, columns 6 are connected to the retaining walls 4 as extensions therefrom, making the columns 6 reinforcing members for the foundation 2. Then the foundation 2 and the retaining walls 4 are structured in lower perpendicular height than a conventional structure. Therefore term of works can be shortened and construction cost can be reduced too.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to basement structures for buildings.

(Prior art) Conventionally, as a basement structure of a building, for example,
Those described in Japanese Utility Model Publication No.-235 and Japanese Utility Model Application Publication No. 61-37337 are known.

These conventional basement structures are constructed so that the foundation of the building also serves as a retaining wall for the basement, and the basement is excavated to a substantially uniform depth.

(Problem to be solved by the invention) However, in such a conventional basement structure, the retaining wall of the basement has a fairly high vertical height, so a fairly large earthen wall acts on the retaining wall. I will do it. Incidentally, the horizontal resultant force PA per unit width acting on the retaining wall 01 and the overturning moment M of the retaining wall 01 are calculated by the following formula, and the horizontal resultant force PA is proportional to the square of the height H of the retaining wall O1, and the overturning moment M of the retaining wall 01 is calculated by the following formula. The moment M is proportional to the cube of the height H of the retaining wall O1 (see FIG. 4).

KA: Active soil strength coefficient γ: Weight per unit volume of soil Therefore, when making a retaining wall higher like in a conventional structure, it becomes necessary to strengthen the supporting ground such as the bottom plate of the retaining wall, and the excavation depth of the basement also increases. If the height is 2m or more, a mountain retainer will also be required. These problems led to longer construction times (and higher construction costs).

The present invention focuses on the above-mentioned conventional problems and aims to provide a basement structure that can shorten the construction period and reduce construction costs.

(Means for Solving the Problems) In order to achieve the above object, the basement structure of the present invention includes: an upper underground portion formed by excavating the ground inside the foundation so that the foundation serves as a retaining wall; The basement consists of a lower underground layer formed by excavating the ground within a predetermined width from the foundation deeper than the foundation.

(Function) In the basement structure of the present invention, the retaining wall of the basement can be divided into a retaining wall in the upper part of the basement and a retaining wall in the lower part of the basement, so the vertical height of each retaining wall is equal to that of the retaining wall of the conventional structure. It can be lower than the wall. Therefore, compared to the conventional structure, the earth pressure acting on each retaining wall is extremely small.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the embodiment will be explained based on FIGS. 1 to 3.

Figure 1 is a perspective view showing the basement structure of this embodiment, Figure 2 is a perspective view showing the basement structure of this embodiment;
Figures 3 and 3 are vertical cross-sectional views showing the basement structure;
is the basement, and 2 is the foundation.

The basement 1 includes an upper underground part 1a formed by excavating the ground inside the foundation 2 so that the foundation 2 serves as a retaining wall, and an underground upper layer 1a formed by excavating the ground within a predetermined width from the foundation 2 deeper than the foundation 2. If the lower underground layer formed by
By excavating to a depth of 0.8m, an underground space with a maximum depth of 2m will be obtained.

In addition, a bottom wall 3 and a retaining wall 4 are constructed of concrete in the lower underground part 1b, and a foundation 2 which also serves as a retaining wall in the upper underground part 1a and a retaining wall 4 in the lower underground part 1b are connected to each other. A bottom plate 5 of the upper underground part 1a is stretched between them.

Note that the retaining wall 4 of the lower underground part Ib is partially covered with the foundation 2.
A column 6 is extended to the same height as the foundation 2.
It is a reinforcing material.

Moreover, one side of the basement l is opened to the outside so that it can be used as a storeroom, and below this opening 7 there is a staircase 8 between the level difference between the outside ground and the bottom wall 3 of the lower basement part ib. A bicycle ramp surface 9 is formed.

Next, the operation of the embodiment will be explained.

In the basement structure of the present invention, the retaining wall of the basement l is divided into the retaining wall (foundation 2) of the upper basement part 1a and the retaining wall 4 of the lower basement part 1b. The vertical height of the wall 4 can be made lower than that of a retaining wall with a conventional structure. Therefore, the amount of soil that acts on the foundation 2 and the retaining wall 4 is extremely small. In other words, there is no need to strengthen the ground. ,
It is possible to shorten the construction period and reduce construction costs.

In addition, the foundation 2 of the upper underground part 1a and the retaining wall 4 of the lower underground part 1b
It is preferable that the angle α obtained from the distance A between the foundation 2 and the bottom wall 3 of the underground lower part tb be smaller than the internal friction angle of the soil. That is, the wider the distance A between the foundation 2 and the retaining wall 4 of the lower underground part tb, the less the force of the foundation 2 will be applied to the retaining wall 4 of the lower underground part 1b, and the ground around the edge of the foundation 2 will not be roughened. This is preferable because it can prevent subsidence.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are design changes within the scope of the gist of the present invention, they are included in the present invention. It will be done.

For example, in the embodiment, a basement used as a storeroom has been described as an example, but the present invention may also be applied to a basement used as a living room.

In addition, in the example, a retaining wall was provided with concrete in the lower underground layer to provide mountain retaining, but the depth of the lower underground layer was 2 m.
If the height is not reached, there is no need to hold the pile. That is, by simplifying the pile retaining, it is possible to further shorten the construction period and reduce construction costs.

(Effects of the Invention) As described above, the basement structure of the present invention does not require ground reinforcement or mountain retaining, so it is possible to shorten the construction period and reduce construction costs.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the basement structure of the embodiment of the present invention;
The figure is a cross-sectional view taken along line II-II in figure 1, and figure 3 is a cross-sectional view taken along line I in figure 1.
The II-III sectional view and FIG. 4 are vertical sectional views for explaining the horizontal resultant force and overturning moment acting on the retaining wall. 1...Basement la-...Upper basement lb...Lower underground 2...Foundation

Claims (1)

[Claims] 1) An upper underground layer formed by excavating the ground inside the foundation so that the foundation serves as a retaining wall, and a lower underground layer formed by excavating the ground within a predetermined width from the foundation deeper than the foundation. A basement structure characterized in that the basement is made up of .