(57) The aseismic foundation consists of three plates (1,2,3) of reinforced concrete.
Plate (1) touches the ground (20). Between plate (1) and plate (2) there are rigid
metal spheres (4), and between plate (2) and plate (3), there are vertical compression-tension
springs (6). Plate (2) is connected with horizontal compression-tension springs (5),
to a reinforced concrete anchor wall (3), which is fixed to the ground (20) and solid-webbed
attached to plate (1). Thus, the anchor wall (8) and plate (1) follow exactly the
movement of the ground (20). The horizontal metal springs (5) are positioned symetrical
and perimetrical on plate (1), having the same total elastic constant for both its
vertical directions. The total elastic constant of spring (5) is such, that the characteristic
period of the horizontal movement of the system plate (2), plate (3), springs (5)
superstructure (19), is equal with the characteristic period of the horizontal component
of the ground vibration. The vertical compression-tension springs (6) have a total
elastic constant, which allows for the characteristic period of the vertical movement
of the system plate (3), vertical springs (6), superstructure (19), to be double than
the characteristic period of the vertical movement of the ground (20).
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