JPS58156634A - Floating foundation for structure in soft ground - Google Patents

Abstract

PURPOSE:To give a bearing force to a structure without causing inclination in soft ground by floating a box in a water tank. CONSTITUTION:Boxes 5 to support a structure are inserted into plural water tanks 2 constructed in proper places of soft ground 1, and dash pots 4 and 6 to interrupt the horizontal movement of the box 5 are provided between the inside wall of each water tank 2 and the outside of the box 5. The water tanks 2 are connected with each other by a communication tube 3 and the boxes 5 are floated in the water tanks 2. By this, even when large numbers of floating foundations as the foundation of a structure are provided, the water levels of the water tanks 2 are kept constant because the water tanks 2 as floating foundations are connected with each other by the communication tube 3. Thus, when the structure is constructed on large numbers of the floating foundations and held horizontally in such a way as to generate a given buoyancy for each box 5, the structure is not inclined even when ground subsidence occurs thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floating foundation that does not cause uneven settlement even in soft ground with insufficient strength for installing the foundation of a structure.

There are two ways to support the foundation of a structure on soft ground: one is to build piles to the supporting ground below the soft ground and support the structure with these piles, and the other is to rely on piles, etc. to transfer the load to the soft ground. There is. When using support piles, the load from the negative friction of the soft layer is applied to the piles, making the piles larger. There was also the problem that the building would float up as the surrounding ground subsided. Furthermore, when friction piles are used, there is a problem in that they are unreliable in maintaining the horizontality of the building against uneven settlement of the soft layer.

Therefore, an object of the present invention is to prevent the foundation of a structure from settling unevenly when the foundation ground is soft and to be able to support the structure without tilting the structure at all times.

Next, the present invention will be explained with reference to the drawings. A plurality of water tanks 2 are formed on soft ground Ill at a position where a structure is to be constructed. In the case of this example, since it is the foundation of a viaduct, a large number of water tanks 2 are formed in a straight line as shown in FIG. The water tank 2 is formed by excavating the soft ground 1 and pouring concrete on the side walls and bottom of the excavated hole, or by installing a ready-made frame in the excavated hole, and then placing it inside the water tank 2. Inject liquid such as water through the water inlet 2a. The lower part of each aquarium 2 is successively communicated with the communication pipe 3, so that the water level of the famous aquarium 2 is maintained at the same level. Further, an appropriate number of dashpots 4 are provided above and below the inner wall of the water tank 20 to prevent horizontal movement of a box 5 to be described later.

Insert a hollow box 5 that will become the basis of the structure into the water tank 2,
The upper part of the box body 5 protrudes above the water tank 2 and supports the structure on the upper surface. When the box 5 is placed in the aquarium 2, and the size of the rectangular parallelepiped box is f 4 m x 4 m x 6 m, the buoyancy is 96 t, which is sufficient to support the structure. Dashpots 6 are protruded from an appropriate number of locations on the upper part of the 1111 wall of the box 5, and together with the dashpots 4, they come into contact with the inner wall of the water tank or the outer wall of the box to prevent horizontal movement of the box. Note that a wire may be used to connect the box body and the water tank instead of the dash pot.

7 tons of springs are installed at appropriate locations between the top of the water tank 2 and the top of the box body 5.
- Provided to buffer shocks, vibrations, etc. that act on the box. Further, a water stop plate 8t is provided at the center of the outer periphery of the box body 5, and throttle holes 8a are provided at several locations in the water stop plate 8 to prevent sudden vertical movement of the box body 5.

'1 The floating foundation of the present invention is constructed by floating the box 5 on the above-mentioned through-hole water tank 2, and even if a large number of floating foundations are provided as the foundation of a structure, the water tanks 2 of each floating foundation are all connected through the communication pipe. As a result, the water level in each tank is kept constant. Therefore, if a structure is built on a number of floating foundations and a predetermined buoyancy is generated for each box to maintain the structure horizontally, even if there is a ground law etc., some parts of the box may
will not sink and the structure will not tilt. Furthermore, even if the water tank vibrates due to an earthquake or the like, the box body 5 inside the water tank is held by the spring 7, and the water stop plate 8 attached to the box body has a restriction hole 8.
Since a is provided, the box body 5 is hardly subjected to vibrations.

According to the present invention as described above, a large number of floating foundations constructed on soft ground do not sink unevenly, so a structure constructed on soft ground is not tilted. In particular, even when many floating foundations are used, such as on elevated bridges, it is possible to maintain levelness with high precision.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the floating foundation of the present invention, and FIG. 2 is a perspective view of the floating foundation used in a viaduct.

Claims (1)

[Claims] Build a plurality of water tanks at appropriate locations on the soft ground where the structure is to be constructed, insert a box to support the structure into each tank, and place the tank at an appropriate location between the inner wall surface of each tank and the outer surface of the box. A floating foundation for a structure on soft ground, with multiple dash pots installed to prevent the horizontal movement of the box, and each water tank connected through a communication pipe.