Abstract: A multi-stiffener for civil engineering and construction includes an outer pipe member, an inner pipe member, an inner pipe position adjusting pin and a positioning member. The outer pipe member includes an outer pipe strut plate provided at one end of the outer pipe member, a pair of slot-shaped symmetrical guide holes extending in a longitudinal direction from a position spaced apart by a predetermined distance from an open end of the outer pipe member, and a height-adjustment-purpose external thread formed around the guide holes. The inner pipe member includes an inner pipe strut plate provided at one end of the inner pipe member and a plurality of symmetrical through-holes formed at specific intervals from the inner pipe strut plate. The inner pipe position adjusting pin is configured to penetrate the guide holes of the outer pipe member and the through-holes of the inner pipe member.

Abstract: A brake device for elevator, including a hollow box-shaped elevator car (1) for holding the passenger or luggage; block (5) having a pair of guide rails (6) for guiding upwards and downwards the elevator car (1); a plurality of racks (4) disposed at the block (5) along the lifting direction in vertical; at least one motor (2) tooth-engaged with at least one pinion (2a) at the racks (4), for lifting upwards and downwards the elevator car (1), clutch (12) for controlling power transmission to connect a driving shaft (19) to a driven shaft (20) when the pinions (11) engaged with the racks (4) are rotated at high speed due to elevator crash; hydraulic pump (15) for generating hydraulic pressure from power transmission through a plurality of transmission gears (13) when the clutch (12) delivers rotation; and a plurality of hydraulic cylinders (17) for braking the elevator by brake pad (18) in tight coupled with the guide rails (6) by hydraulic power from the hydraulic pump (15).