AMORTIZING FOUNDATION RACK FOR EQUIPMENT Russian patent published in 2017 - IPC E02D27/44 

FIELD: construction.

SUBSTANCE: amortizing foundation rack for equipment includes a casing installed on the lower structure with a gap in relation to the upper building and a rod placed in the casing; the rack is equipped with a spring placed between the upper and the lower buildings and covering the casing made from coaxial sections, the top outer one and the bottom inner one, with blocks installed on the upper end of the bottom section; the rod is made with a pivot hingedly attached to its lower end, suspended through cables enveloping the blocks to the bottom of the upper casing section. A spring installed between the lower and the upper structures of the foundation is made as a combined spring with a built-in damper, comprising a cylindrical helical spring consisting of two parts with counter-directed ends, one part of the which has the coils of the rectangular cross section, and the other part of the spring is made hollow. The counter-directed end of the first part is placed in the cavity of the second one, the gaps of the segment profile of the contacting spring parts are filled with an antifriction lubricant. At the end of the second part of the spring, there is a sealing collar to prevent the lubricant leakage, and the first part of the helical spring, made with coils of the rectangular cross-section with rounded edges, is covered by a tube of a damping material, for example polyurethane. The gaps in the first part of the helical spring made with coils of the rectangular cross section, which is covered by the tube of a damping material, are filled with crumbs of a friction material made of a composition containing the following components, at the ratio, in wt %: a mixture of resol and novolac fenoloformaldegide resins at the ratio of 1:(0.2-1.0) 28÷34%; a fibrous mineral filler containing glass roving or a mixture of glass roving and basalt fibre at the ratio of 1:(0.1-1.0) 12÷19%; graphite 7÷18%; a friction modifier containing carbon black as a mixture with kaolin and silica 7÷15%; barite concentrate 20÷35%; talc 1.5÷3.0%.

EFFECT: increasing the vibration damping efficiency, reducing dynamic loads on the lower structure of the foundation.

2 dwg