FR2549871A1 - PATENT OF A PARASISMIC BLOCK OF ANTI-CRACKS RECOVERY OF VOLTAGES AND VIBRATIONS - Google Patents

Abstract

The invention relates to an assembly of mechanical solutions allowing the erection of all buildings, resistant to seismic or telluric tremors, by the installation in the foundations of anti-seismic units. They are composed of two caissons 1 and 2 made from high strength steel, holding two internal pivots 3 and 4 also cast in steel. The base plates of these pivots rest on different areas of steel balls 5 and 6 having different diameters allowing displacements of variable amplitude of the main pivot on which are fixed the foundation longitudinal members or footings of the planned building 7.

Description

DESCRIPTION
The object of the present invention is, by judicious use in foundation soles of paraseismic blocks produced industrially and arranged in sufficient numbers according to the loads and overloads of the planned construction, to allow the latter to resist and absorb a most of the possible seismic movements (both vertically and laterally), significantly reducing the risks of cracking of any construction.

The various means currently used to resist earthquakes consist much more in reinforcing the reinforced concrete frames of the envisaged constructions than in allowing an absorption capacity of said telluric movements by the construction itself.
The paraseismic block object of the invention will mechanically absorb all movements of variable amplitude in a vertical direction as well as the tensions and vibrations reflected by the ground both horizontally and vertically.

 A constructive project correctly established with, on the one hand, validly distributed load and overload calculations and, on the other hand carefully and rationally divided by vertical expansion joints uninterrupted at the different levels, will allow a constructive mode allowing itself slight lateral or vertical movements, the construction of truly anti-seismic works imperatively necessary in certain regions.

This anti-seismic block shown in Figure 1 consists of a steel box
E 24-1 cast in a single block - item 1 - comprising in 1 a, a bottom thicker than the walls since receiving the vertical pressures and, in 1 b, two handling and handling rings (storage and implementation).

The interior will be hot-dip galvanized, the exterior being galvano-plasticized to provide effective protection against corrosion while making it antimagnetic.

 A second box of the same metal - item 2 - also comprising a bottom 2 which is thicker than the walls which can penetrate into the box 1 through the orifice 1 c. A thick E 24-1 steel washer will close this box (2b) and will be welded with argon.

 An external compression pivot 3 cast in E 24-2 steel foundry, internally draws (3 a) and comprising a compression base (3 b) whose diameter will allow free sliding inside the box 2, a sole 3 c drilled and tapped to subsequently receive the protective sheets. And finally in 3 d, a circular rebate, coming from foundry, sparing the location of a later joint.

 A second inner pivot 4 spreading cast in E 24-2 steel foundry, with compression base 4 has the shape of the sketch and which slides freely in the alèsaqe 3 a of the outer pivot.

 Between the main box 1 and the inside box 2, a field of steel balls (5) of different diameters.

 In the inner box 2, a field of steel balls (6) under the compression base 4 a and steel balls of larger diameter (7) up to the base 3 c of the external compression pivot. A soft oil / 8) non-acidic, unalterable, rot-proof for storage and anti-corrosion will complete this inner box which, to perfect its tightness, will be fitted with a double lip rubber (9) having the same inside diameter as the compression pivot exterior (3).

 To complete this seal, a bellows seal (10) in black synthetic rubber of ethylene propylene-based thermopolymer placed in the circular rebate 3 d will cover the box 1 around its entire periphery in 1 c.

 And finally, in it a protective sheet of steel 4 mm thick, valvano-plasticized inside and outside, protecting the paraseismic block from subsequent embankments.

All the elements as described above constituting an earthquake-resistant block, the dimensions of which are liable to vary depending on the construction envisaged, the implementation of such blocks being carried out as follows (crack 2>
The foundation earthworks will preferably be executed in points, judiciously distributed over the whole of the future construction, down to the right soil (12). After depositing at the bottom of the excavation multi-layers of compacted sand (13) on which a prefabricated sole (14) of vibrated reinforced concrete will rest, calculated by resistance points and laid with perfect flatness.

 After having unbolted and removing the protective cap (11) made of 4 mm sheet metal from the para-seismic block, said block is lowered onto the prefabricated flanges (14) using the two rings (1 b> of the box, provided for this effect.

 Replacement of the protective part (11) without bolting it onto the sole (3 c) of the main pivot, the latter receiving the intermediate compression parts (15) such as metal sills, double soles, bases, etc ... fixed by camnished bolts of different length, through the protective part (11) on said sole (3 c). The whole being made integral by a concrete block.

 This static mechanical system allows the displacement, rotation or the collapse of the ground, compensated by the movement of the pivots integral with the foundation soles, on their various beds of steel balls mechanically recovering said displacements.

 On Figure 1, the accidental displacement by subsidence of the ground (or any other causes) of the box (1) will be compensated by the first bed of small balls (5) giving constant stability to the internal box (2) and all its organs .

 The internal balls of this second box (6) in their lower part and under the compression base (4a) are of a diameter allowing them to pass laterally to said base (nar Vertical depression).

 The field of balls with a larger diameter (7) under the compression base of the main pivot (3 c) exerts a vertical compression on 6 by means of 3 c and 4 a.

 A third of the vertical pressure is kept in reserve for movements from the ground, giving stability to the inner box in case of subsidence.

 The whole of this block, many of which will be of the standard type, will be calculated to support a reserve of one third of the weight of the building, distributed by points.

Claims (1)

 RETAIL ICA TIONS  First claim: Seismic anti-crack para block recovering tensions and vibrations, characterized in that it comprises an external box (1) with a bottom (la) thicker than the walls, and two handling rings (1b) , a second inner box (2), of an outside diameter so that it can be introduced into Ze outside box, by its upper orifice, two compression pistons with shoes (3) and (4) allowing the recovery of the tension , vibration and all movements between the boxes (1) and (2), being in a field of small balls of different diameters (5).  Second claim: BZoc anti-seismic anti-cracking, tension and vibration recuperator, claim (1) characterized in that the pivot pin (4 a) comprises a compression assembly with an outside diameter allowing its introduction and free sliding in Ze box (2).  Third ~ claim: Anti-crack anti-seismic block, tension and vibration recuperator, according to claim (1) characterized in that the Pivot cylinder (3) slides Zibrement in the bore of the outer pivot (4).  Fourth claim: BZoc anti-seismic anti-cracks, tension and vibration recuperator, characterized in that the box (2) comprises balls (6) placed under Ze compression base (4) and a mixture of balls (7) with a larger diameter, which cannot pass between the walls of the box (2) and the pivot (4a). BiZZes placed up to the base (3b) of the external compression pivot, the part (8) being composed of an anticorosive fluid.  Fifth claim: BZoc anti-seismic anti-cracks, tension and vibration recuperator, according to claim (1), characterized in that the seal is assumed by a double Zebra element, and a bellows seal (10 )  Sixth claim: BZoc para-s ismi that anti-cracks, tension and vibration recuperator, according to claim (1), characterized in that the protection of subsequent embankments is ensured by a protective sheet (12), fixed on sole (3c) of the main pivot.  Seventh claim: BZoc anti-seismic anti-cracking, tension and vibration recuperator, according to claim (1) characterized in conclusion that all the parts are metallic and antimagnetic, by Ze electroplating system, having contacts with Ze ground and parts assembly (11), protective plate fixed on the sole (3c).