GB578921A - Improvements in foundations - Google Patents

Abstract

578,921. Foundations. WILLIAMS, L. W. March 15, 1944, No. 4861. Convention date, March 10, 1943. [Class 20 (ii)] [Also in Group XXIV] A foundation for buildings and machines and particularly power hammers, is of laminated construction comprising a plurality of superimposed plates of tough ductile metal capable of absorbing heavy stresses without failure and of becoming more firmly united under such stresses, and means for securing such plates in superimposed relation and against relative slip. Mounted on the concrete main base 10 of a large power hammer is a sub-base 11 which may be laminated according to the invention, or a cast steel block of a thickness of the order of two and a half feet and secured by bolts 12 the anvil block 13 carries a block 14 with die 15. The super-structure 16 of the hammer is secured by bolts 17, 18, to the anvil block which is of laminated structure being built up of plates 19-22 the opposed surfaces of which are corrugated to produce interlocking. Relative movement of the plates longitudinally of the corrugations is prevented by vertical bolts of different lengths. Thus, a number of bolts 23 pass through holes in the six lowermost plates, the heads being inserted in recesses 24 in the top surface of the lowest plate, the upper ends of the shanks terminating short of the bottom surface of the next overlying plate. The bolts are a sliding fit in the holes. Similarly, bolts 25 prevent relative movement of the top seven plates and, at the same time, lock the upper set of plates to the lower plates. All the plates above the bottom plate 22 are locked together by bolts 27 the heads of which bear against springs 32 in recesses 28 in the lower plate 21, the upper ends of the shanks having nuts in recesses 29 in the block 14. The anvil block is secured to the subbase 11 and main base 10 by bolts 30. Compression springs 35 are placed under the nuts 36 which secure the super-structure 16 to the block. Groups of plates may be welded together by seams at the ends. The plates 20, 21, 22 are made from a tough, ductile steel or alloy ferrous or non-ferrous; the top plate 19 may also be of the same material but is preferably a heat-treated alloy steel having greater hardness and toughness. The plates may be heat-treated. Sheets of soft material, e.g., lead, bronze, or wood may be placed between the corrugated steel plates and sealed by the welds referred to above. Instead of the plates being corrugated, they may be flat and formed with projecting members and corresponding recesses.