| 摘要 |
FIELD: construction engineering. SUBSTANCE: this relates to construction of special structures and can be used in erection of entrances to protective structures and also for protection of entrances to underground spaces of cities. Purpose is to protect declined staircase, also horizontal section of entrance (tunnel), and to reduce material intensity and own weight of protective devices of entrance door openings. This is achieved by provision of tipping panel in upper part of covering of incline entrance section. Panel is pivotally attached by its lower side in covering of entrance incline section. Its upper side is resting on spring detents coming into holes of upper supporting fixing members which are secured on reinforced concrete beams. Spring detents are kinematically linked with electromagnetic locks. Installed on upper surface of tipping panel made of load-carrying frame of channel beams and sheet material is rod connected with curvilinear joining member. Free end of rod is secured on thrust channel beam installed inside tipping panel. Free end of curvilinear joining member is connected with spring of spring-anchor device. Mounted on outer surface is rarefaction wave contactor. Protective housing is installed above link curvilinear member. Upper supporting unit of tipping panel covers protective apron. Spring-anchor device is made of cylindrical metal sleeve installed in hole of reinforced concrete stop and secured to covering of incline section of entrance by means of supporting yokes. Welded to upper part of sleeve is narrow flange on which mounted atop is wide covering flange. Installed inside sleeve is spring fastened by its one end on truncated spacer cone seated in coupling made of pliable material. Rarefaction wave contactor has body which is covered atop with upper membrane resting on additional lower ring. Located inside body is freely movable inertial member to which horizontally attached is movable contact strip sliding over stationary contact strip fastened to contactor body. Contact seat is installed on stop in upper membrane. Installed on side of upper stage over its edges are lower supporting fixing members. Secured underneath to tipping panel is shock absorbing member. Compression wave contactor is installed at certain distance from protected entrance. All contactors, electromagnetic locks and electric power sources are linked in electric circuits according to definite electric scheme. EFFECT: high efficiency. 3 cl, 5 dwg |
