BALLASTLESS BRIDGE DECK PANEL AND METHOD OF PANEL FORMING Russian patent published in 2005 - IPC

FIELD: building, particularly ballastless bridge deck adapted for laying rail track on reinforced concrete panels of railroad metal span structures and panel production method.

SUBSTANCE: panel is formed as concrete structure having rectangular cross-section and reinforcement arranged in two levels. The panel has width of not more than 3.2 m and length of not more than 2.0 m. The panel includes two rows of rain lugs formed on upper surface thereof and conical orifices arranged in designed succession and adapted to receive fastening members, which secure panel to span structure beams, defining ovals in plane. The orifices are created by steel releasable void formers provided with ring-bolts. Paraffin layer is applied on void formers. The panel also has conical orifices defining rounds in plane and adapted to secure flange rail to panel. Above orifices are created by steel removable void formers having paraffin layers. The panel includes orifices defining ovals in plane and adapted to connect rails to panel. The orifices are created by retained void formers of plastic material, preferably of polyethylene, and are fitted with embedded saddle-shaped washer provided before void formers installation in mould. Method for panel production involves arranging void formers in heat-insulated mould not above layer of concrete mix pouring in the mould, wherein void formers have vertical orifices and void formed tops are closed with sealing caps preferably formed of rubber; fastening void formers with lugs made in mold bottom plate by bolts passing through orifices; laying reinforcement frame in the mould; pouring concrete mix and smoothing thereof by concrete vibrating screed to obtain smooth panel surface in contact areas between the panel and bridge span beams; performing heat and moisture treatment along with providing equal temperatures along panel section during heating system operation with taking into consideration possible timeouts with duration of not more than 3 hours; removing panel from mould by engaging ring-bolts arranged in orifices of void formers adapted to secure panel to bridge span panels and conveying the ready panel to storage facility by panel ring-bolt engagement.

EFFECT: increased performance characteristics, particularly improved reliability and increased service life, enhanced manufacturability along with reduced labor inputs.

2 cl, 6 dwg