JPH039965B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a foundation structure for a structure, and particularly to a foundation structure suitable for supporting a relatively large structure.

Conventionally, support structures using diagonal piles have been known as support structures for structures, in which concrete piles are driven into the ground at arbitrary angles to the vertical line to form the foundation structure. The diagonal pile is
Similar to vertically driven piles, it is possible to support structures on top of piles not only vertically, but also horizontally.

However, when the structure on the pile is a relatively large structure such as an oil drilling platform built on the ocean, there are the following drawbacks.

In other words, when supporting a large structure with the above-mentioned diagonal piles, there is relatively no problem with vertical forces, but the area that receives pressure that resists horizontal forces is small. Therefore, in order to effectively resist this, it is necessary to drive multiple piles so that their outer peripheral surfaces are in contact with each other, but it is not possible to drive adjacent piles with their surfaces touching from the top to the bottom. , which was extremely difficult and almost impossible.

Therefore, there was a drawback that it could not sufficiently resist forces acting in the horizontal direction.

Furthermore, even if the piles could be driven in contact with each other as described above, the adjacent piles would not be integrally connected, and this would also pose a problem in terms of strength.

Furthermore, there are a wide variety of structures built on piles, and it is extremely difficult to select the most effective pile shape and arrangement from existing slanted piles against the forces that act on them. It was hot.

This invention was made in view of these problems, and its purpose is to effectively and reliably resist horizontal forces acting on the superstructure by increasing the pressure-receiving area. With,
The purpose of this invention is to provide a basic structure for a structure whose shape and arrangement can be selected to be optimal for this acting force.

To achieve this object, the present invention provides a foundation structure for a structure consisting of continuous or single panel-like underground walls constructed underground, wherein the underground walls have substantially the same shape and are opposed to each other. The upper end of each of the underground walls is connected to the structure, and the lower end of each of the underground walls reaches a support layer such as underground bedrock. The structure is characterized in that the underground walls are each inclined outward at substantially the same angle with respect to the vertical direction to support the structure.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the basic structure of a structure according to the present invention.

In the foundation structure shown in the figure, when the structure has a footing 10 that is substantially rectangular in plan, underground continuous walls 18 of substantially the same shape supporting each of the four sides are formed with substantially the same width as the footing 10 and each vertically vertical. It is constructed so as to be inclined outward at a predetermined angle θ with respect to the direction.

In the foundation structure shown in the figure, first, a narrow groove with a substantially rectangular horizontal cross section is excavated from the ground so as to form a predetermined angle θ outward with respect to the vertical direction.

This excavation is carried out in muddy water by tilting the excavator by an angle θ to prevent the collapse of the ground after excavation, but the reaction force of the excavator is not taken from the ground. It is desirable to proceed with the excavation work by inserting the force members at the same time because the stability of the ground is high and the reaction force members can be used as a guide for the excavator, thereby increasing excavation accuracy.

Then, when excavation is performed to a predetermined depth to a support layer 12 such as strong ground, a reinforcing bar cage is suspended in the excavated groove, and concrete is poured and hardened to form the preceding panel 14.

After this, a groove similar to the groove described above is excavated in the lateral direction of the preceding panel 14, and the following panel 16 is connected and integrated with the preceding panel 14 by inserting a reinforcing bar cage and pouring concrete. By sequentially connecting and forming trailing panels laterally in a similar manner, an underground continuous wall 18 of a predetermined length is constructed at a predetermined location to form a foundation structure.

In this case, the preceding panel 14 and the following panel 1
For example, it is desirable to insert reinforcing reinforcing bars for connection into the joint portion 6, or to make the cross-sectional shape of the joint portion a concave-convex fit.

Now, in the foundation structure configured as described above, the surface of the underground continuous wall 18 resists the horizontal force acting on the footing 10, and the pressure receiving area is larger than that of a conventional inclined pile. Since the panels 14 and 16 are extremely wide and have a solidly joined integral structure, it is possible to reliably and effectively resist horizontal forces.

In addition, there are no restrictions on the location where the underground continuous wall 18 is formed, and it can be placed at any location, and its cross-sectional shape can be arbitrarily selected.Furthermore, excavation accuracy can be improved by the above-mentioned means, so that the footing This means that the most effective shape and arrangement can be selected in response to changes in acting force due to shape, weight, etc. of 10.

Incidentally, in the above embodiment, a case was shown in which the panels 14 and 16 were joined in the horizontal direction, and the wide plane parts of the underground continuous wall 18 were formed so as to face each other.
It is also possible to form these by connecting them vertically, and depending on the footing 10 and the surrounding soil, it is not necessary to provide underground continuous walls 18 on each of the four sides, but on two opposite sides. By providing
It is possible to sufficiently exhibit the above-mentioned effects.

Furthermore, in this embodiment, a plurality of panels 14, 16 are used as the basic structure supporting the footing 10.
Although we use an underground wall 18 that connects the panels, depending on conditions such as the weight of the structure and the properties of the ground, it is also possible to use an underground wall composed of a single panel as the foundation structure. .

3 and 4 show another embodiment of the present invention, and only its characteristic points will be explained.

The foundation structure of the structure shown in the figure is constructed in the same manner as in the above embodiment, but the constructed underground continuous wall 18 contains the earth and sand 20 within it. It is located at a point where the horizontal cross section is approximately rectangular so as to surround the area.

The underground continuous wall 18 configured in this manner also exhibits the same effects as those of the above-mentioned embodiment, and the earth and sand 20 surrounded by the underground continuous wall 18 can be
When a horizontal force acts on the underground continuous wall 18,
Since it acts as a frictional force that opposes this, the resistance that opposes the horizontal force becomes extremely large.

Therefore, the foundation structure of this embodiment is suitable as the foundation of a larger structure.

In this embodiment as well, the shape surrounding the earth and sand 20 is not limited to the above-mentioned shapes, and may be, for example, a polygon such as a pentagon or a hexagon, or a substantially circular shape or a substantially circular shape with a large number of panel divisions. It is also possible to form a closed cross-sectional shape of an elliptical polygon.

As described in detail in the embodiments above, the present invention provides a foundation structure for a structure constructed underground using underground walls in the form of a continuous or single panel, wherein the underground walls have substantially the same shape. The upper end of each of the underground walls is connected to the structure, and the lower end of the underground wall is connected to a support layer such as underground rock. The underground walls are formed to support the structure by being inclined outward at substantially the same angle with respect to the vertical direction, so that they are effective and reliable against horizontal forces. It is possible to ensure a pressure-receiving area that counteracts this force, and to enable an optimal foundation shape and arrangement for this acting force.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a plan view and FIG. 2 being a sectional view taken along the line AA in FIG. 3 and 4 show other embodiments of the present invention, in which FIG. 3 is a plan view and FIG. 4 is a sectional view taken along line BB in FIG. 3. 10...Footing, 12...Support layer, 14...
... Leading panel, 16... Trailing panel, 18... Underground continuous wall, 20... Earth and sand.

Claims (1)

[Claims] 1. A foundation structure for a structure consisting of a continuous or single panel-shaped underground wall built underground, wherein the underground wall is formed of a plurality of walls formed facing each other and having substantially the same shape. The upper end of each of the underground walls is connected to the structure, and the lower end of each of the underground walls is formed so as to reach a support layer such as underground bedrock. , and the underground walls are each inclined outward at substantially the same angle with respect to the vertical direction to support the structure. 2. The underground wall is composed of a continuous underground wall in which a plurality of panels of a predetermined length are connected in the horizontal direction, and the wide flat parts of the pair of the continuous underground walls are formed so as to face each other. A basic structure of a structure according to claim 1. 3. The structure according to claim 2, wherein the underground continuous wall is formed to have a closed polygonal cross-sectional shape surrounding the earth and sand so as to contain the earth and sand therein. basic structure.