Hydraulic and earth engineering – Foundation
Patent
1990-03-07
1992-02-04
Corbin, David H.
Hydraulic and earth engineering
Foundation
52167R, 405157, 405258, 405267, E02D 3108
Patent
active
050855395
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method and an arrangement for influencing the interaction between a layer of earth and a structure situated in association with the layer of earth. The expression structure is used primarily to denote buildings, tunnels, foundations, devices which produce vibrations and similar. The arrangement, which is in the form of a casing filled with a medium, is intended first and foremost to be arranged close to or in direct association with said structure in a material surrounding the casing.
The arrangement of gas-filled mattresses in earth or water for vibration-damping purposes is previously disclosed. A previously disclosed mattress is the so-called single-cell mattress described in SE-B-8202478-7 (publication No. 430 620). Since this mattress is arranged essentially vertically, and is then filled with a gas, its final geometry in the installed position is not apparent. Mattresses of this kind are frequently forced down to considerable depths, where the surrounding pressure is very high. This makes the mattress difficult to fill with gas, and there is also a risk that it will adopt a pear-shaped cross-section with the narrowest part at the bottom. This form has a negative influence on the vibration-damping characteristics of the mattress. In order to improve the mattress, U.S. Pat. No. 4,647,258 proposes a mattress made of a flexible, multi-layer membrane. In this mattress it is possible to adapt the pressure to the surrounding pressure of the earth at different depths, at the same time as the smaller cells make the mattress less sensitive to puncturing. The mattress is intended to be arranged essentially vertically, with the elongated cells running horizontally. Any vibrations present in the earth which strike the mattress essentially at right-angles or to all intents and purposes at right-angles will be damped effectively. However, the mattress is less well suited to the damping of vibrations in its longitudinal direction. The force-absorbing capacity of the mattress in said direction is likewise restricted.
SUMMARY OF THE INVENTION
The present invention makes available a method and an arrangement for influencing the interaction between a layer of earth and a structure. What is characteristic of the invention is that a shaft is formed in the layer of earth, that said shaft is filled with a material, and that a casing filled with a medium is arranged in said material so that it surrounds the casing. The arrangement is characterized by a casing filled with a medium and introduced into the layer of earth, and by a material surrounding the casing.
The expression influenced interaction between the layer of earth and the structure concerned is used here to denote in the first place the possibility, by means of the method and the arrangement in accordance with the invention, of compensating for or taking up movements in the earth between the earth and the structure. In other words, it is possible by means of the method and the arrangement to achieve movement-equalizing and deformation-equalizing characteristics. Furthermore, the arrangement possesses significant thermal insulation characteristics.
An essential characteristic is that the casing filled with a medium exhibits such flexibility and such resilient characteristics that the volume of the casing reduces as the pressure increases, and increases as the pressure reduces. Previously disclosed single-layer mattresses and previously disclosed multi-layer mattresses can constitute a casing suitable for the intended purpose. These can consist of one or a number of cells filled with a medium in the form of a gas, a liquid, a foam material or similar. Other casings are conceivable, and different examples will be described below.
An essential characteristic feature of the present invention is that the casing is enclosed within a material which shields the casing against contact with the surrounding earth. One of the reasons for the bentonite shield is to form a barrier which is impermeable by liquids,
REFERENCES:
patent: 3386251 (1968-06-01), Casagrande et al.
patent: 3804543 (1974-04-01), Best
patent: 4279547 (1981-07-01), Clem
patent: 4647258 (1987-03-01), Massarsch
Derwent's Abstract No. G 2632B/29, SU 626 154.
Corbin David H.
S.A. Compagnie Internationale des Pieux Armes Frankignoui
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