JPH1060912A - Structure for forming ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new structure, in which while following the basic construction of a cylinder foundation, the construction efficiency can be improved, and the reduction of costs can be realized by applying waste material. SOLUTION: A structure 1 for forming a ground is a foundation of a structure constructed on a soft ground WG, in which a rubber monolayer is stacked in a soft layer WL on a hard support layer S to form an outer shell, and the interior of the outer shell is filled with a filler material 4. Thus, the outer shell member of a cylinder foundation can be easily formed so as to improve construction efficiency. The rubber monolayer 3 is a used tire. Accordingly, the used tire which is hard to be discarded can be used effectively so as to remarkably reduce the cost. The filler material 4 is a cement milk single substance or a mixture of cement milk and waste material. Thus, the structure 1 for forming a ground can be made strong, and if a waste material is mixed, the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure for a building, a building, and the like, and more particularly to a structure for forming a ground using a single layer of rubber when constructing a cylindrical foundation used for a soft ground. Things.

[0002]

BACKGROUND OF THE INVENTION Buildings and structures built on soft ground may undergo foundation movement when subjected to an earthquake, and if this movement is severe, they may be damaged. Therefore, in order to prevent the building or the building from being damaged, it is sufficient to increase the effective depth of the foundation and prevent the soil immediately below the loading surface from escaping in the lateral direction. For this reason, conventionally, a foundation structure called a tube foundation has been adopted. In this case, the tip of a reinforced concrete square tube, outer shell having a cylindrical cross section, etc. is brought into contact with a hard support layer located below the soft layer, and concrete is hit on the bottom portion of the outer shell member. Concrete is filled with earth and sand, concrete, etc. Such a tube foundation has an overburden above the lower end surface of the tube, surface friction between the tube and the soil, and shear resistance of the soil in total shear failure,
This will substantially increase the effective depth of the foundation and improve the bearing capacity.

By the way, at the time of the Great Hanshin-Awaji Earthquake, buildings using seismic isolation structures suffered little damage, and various seismic isolation structures such as isolators using laminated rubber are being actively developed. In research and development of these seismic isolation structures, it is important to reduce the cost of construction methods, as well as the basic mechanisms (support, movable, damping) of the seismic isolation principle. In general, when a seismic isolation structure is adopted, as the number of floors of a building increases, the cost of the seismic isolation structure is absorbed and it becomes more economical. Cost reduction is progressing before that. On the other hand, in ordinary houses, which are mostly two or three stories high, the cost of the seismic isolation structure is extremely high in the entire house. The fact is that the seismic isolation structure has not been sufficiently spread.

[0004]

[Technical Problem Attempted to Be Developed] The present invention has been made based on such a background, and while following the basic configuration of the tube foundation,
The technical problem was to develop a new ground formation structure that has good construction efficiency and can realize low cost by using waste materials.

[0005]

The structure for forming a ground according to the first aspect of the present invention is a foundation of a building constructed on a soft ground, and is formed by stacking a rubber single layer in a soft layer on a hard support layer. An outer shell is formed, and a filler is filled in the outer shell. ADVANTAGE OF THE INVENTION According to this invention, the outer shell member of a tube base can be easily formed and construction efficiency can be improved.

[0006] The structure for forming a ground according to claim 2 is characterized in that:
In addition to the above requirements, the rubber single layer is an old tire. ADVANTAGE OF THE INVENTION According to this invention, while being able to effectively use old tires which are difficult to dispose of, it is possible to significantly reduce costs.

Further, in the structure for forming ground according to claim 3, in addition to the requirements described in claim 1 or 2, the filler is a cement milk alone or a mixture of cement milk and waste material. I do. According to this invention, the structure for ground formation can be made strong,
When waste materials are mixed, the cost can be reduced.

Further, in the structure for forming a ground according to a fourth aspect, in addition to the requirements described in the first or second aspect, the filler is sand or gravel or a mixture thereof. ADVANTAGE OF THE INVENTION According to this invention, the structure for ground formation can be comprised elastically and the structure built on this can be provided with the seismic isolation. The problems described above are achieved by the inventions described in these claims.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ground forming structure 1 according to the present invention will be described below.
An example of the construction method will be shown and specifically described. First, the rubber single layer 3, which is a main member of the present invention, will be described. This is a cylindrical member having a diameter of about 10 cm to 1 m and a height of about 10 to several tens cm. It is made of rubber, natural rubber or a mixture thereof. In the present embodiment, an old tire defined in claim 2 is used as the single rubber layer 3.

FIG. 1 shows the entire shape including a ground forming structure 1 and a building 2 constructed on the basis of the ground forming structure 1. The ground forming structure 1 is constructed on a soft ground WG. This part is responsible for ground improvement when constructing the object 2.
Usually, soft ground W capable of constructing such a building 2
G is a material in which a hard support layer SL exists below a soft layer WL having a thickness of about several tens cm to several meters made of sand, gravel, wet soil, or the like.

First, as shown in FIG. 2B, the soft ground W
For the soft layer WL at the construction site in G, the rubber single layer 3
A vertical hole (diameter of about 10 cm) having a larger diameter is excavated, and the excavation is performed from the ground surface GL to the surface of the support layer SL.

Next, as shown in FIG. 2 (c), concrete is cast into the vertical hole on the upper surface of the support layer SL, which is the bottom, to form a deep foundation 5. This deep foundation 5
May be omitted if the hardness of the support layer SL is sufficient.

Next, as shown in FIG. 2D, the rubber single layer 3 is stacked on the deep foundation 5 or the support layer SL up to near the ground surface GL. At this time, a plurality of rubber single layers 3
Is temporarily fixed in advance with rubber glue or the like, and a cylinder is appropriately formed according to the height dimension of the soft layer WL, so that the operation can be performed smoothly.

Next, as shown in FIGS. 2 (e) and 3,
The filling material 4 is filled in the hollow portion of the rubber single layer 3, and this filling material 4 can be selected according to the function given to the ground forming structure 1, and includes a movable system and a fixed system. Classified as First, the fixed filler 4 is cement milk alone or a mixture of cement milk and crushed concrete fragments as waste material, while the movable filler 4 is sand or sand defined in claim 4. Gravel or a mixture thereof. By the way, at the time of filling these fillers 4, high density filling can be performed by applying vibration with a vibrator or, particularly, in the case of sand of a movable system, by water-tightening.

When the filling of the filler 4 is completed and the cement milk is solidified, the space between the rubber single layer 3 and the soft layer WL is appropriately backfilled to complete the ground forming structure 1. .

The ground forming structure 1 thus constructed
2 (f) and FIG. 1, the foundation of the building 2 is cast, and the load of the building 2 is transmitted to the strong support layer SL via the ground forming structure 1. It is done.

On the other hand, the ground forming structure 1 using the movable filler 4 is elastic against horizontal stress, so that it absorbs vibration during an earthquake and Can greatly reduce the seismic response acceleration.

[0018]

[Other Embodiments] A ground formation structure 1 according to the present invention is based on the above-described embodiment.
Based on the technical idea of the present invention, the following embodiments can be adopted. First, as shown in FIG. 4, when an old tire is used as the rubber single layer 3, it is preferable that concrete is previously applied to the hollow portion (between the rim and the tread) of the old tire. In this case, when laminating the rubber monolayer 3 in the vertical hole formed in the soft layer WL, it is possible to prevent the deformation of the rubber monolayer 3 located below. In addition, the filler 4 is uniformly filled in the rubber single layer 3. Furthermore, the rubber monolayer 3 is prevented from floating in the cement milk filled in the vertical hole. Therefore, the construction can be performed accurately and quickly.

As shown in FIG. 5, when the rubber monolayers 3 are stacked, an annular steel plate 3B is interposed between the individual rubber monolayers 3.
May be inserted. In this case, the vertical proof stress is improved. Further, a lead plug 3P may be inserted into the hollow portion of the rubber single layer 3. In this case, the vertical proof stress is improved, and the horizontal restoring force is improved.

[0020]

The present invention has the above-described configuration and has the following effects. First, claim 1
According to the described invention, the outer shell member of the tubular foundation can be easily formed, and the construction efficiency can be improved.

According to the second aspect of the present invention, it is possible to effectively use old tires which are difficult to dispose, and
Cost can be significantly reduced.

Further, according to the third aspect of the present invention, the ground forming structure 1 can be configured elastically, and the building 2 constructed thereon can be provided with seismic isolation.

Further, according to the fourth aspect of the invention, the ground forming structure 1 can be made strong, and the cost can be reduced when waste materials are mixed.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a ground forming structure and a lower part of a building according to the present invention.

FIG. 2 is an explanatory view showing a stepwise construction procedure according to the first embodiment;

FIG. 3 is a cutaway perspective view showing how a filler is filled in the ground forming structure of the present invention.

FIG. 4 is a longitudinal sectional side view showing a state of placing concrete beforehand on a rubber single layer, and a perspective view showing a part of the rubber single layer on which concrete is placed in a cutaway manner.

FIG. 5 is an exploded front view showing an embodiment in which a steel plate is sandwiched between rubber monolayers and a lead plug is inserted, and a part is broken.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground forming structure 2 Building 3 Rubber single layer 3B steel plate 3P Lead plug 4 Filler 5 Deep foundation WG Soft ground WL Soft layer SL Support layer GL Surface

Claims (4)

[Claims] 1. A foundation for a building constructed on soft ground, wherein a rubber monolayer is stacked in a soft layer on a hard support layer to form an outer shell, and a filler is filled in the outer shell. A structure for forming a ground, characterized in that: 2. The ground forming structure according to claim 1, wherein the single rubber layer is an old tire. 3. The ground forming structure according to claim 1, wherein the filler is a cement milk alone or a mixture of a cement milk and a waste material. 4. The ground forming structure according to claim 1, wherein the filler is sand, gravel, or a mixture thereof.