BEAM MODULE FOR NONSPLIT COMPOSITE PRESTRESSED SPANS Russian patent published in 2001 - IPC

FIELD: building structures; bridge spans. SUBSTANCE: beam module is essentially T- or trapezoidal section structure with main prestressed reinforcement mounted at least in bottom ledge and longitudinal duct to accommodate cable reinforcement. Novelty is introduction of insert made of thin sheet corrugated material that forms mentioned longitudinal duct during module manufacture; height of beam module makes up 1/20-1/30 of its span. Steel covered with nonferrous metal, minimum 50 micron wide, or polymeric material may be used as thin sheet corrugated material. Insert may be step-wise arranged along beam module length; insert parts are joined together lengthwise by means of sockets made of metal or polymeric material. Insert is filled with lubricant such as grease or graphite lubricant over entire length or in steps preferably in end parts; end parts are provided with removable plugs passing cable reinforcement. EFFECT: improved operating characteristics of mounted structure and uniformity of load distribution throughout length of beam module. 5 cl, 2 dwg