Discussion on Construction Technology for Prestressed Thin-walled U-shaped Beam with 42 m Pretensioning Method on High-grade Highway
In view of the technical difficulties in the construction of prestressed thin-walled U-shaped beam with 42 m pretensioning method,based on an expressway construction project,this paper analyzes the main procedures of U-shaped beam construction,studies the layout of prefabricated beam yard,the design of concrete mixture proportion and the staged tensioning of steel strands,and puts forward the construction process and key technology of U-shaped beam prefabrication.In the prefabricated beam engineering,a perfect staged temperature controlled steam curing system and method are proposed,the construction technology of synchronous template installation in concrete pouring process is introduced,the static bearing capacity testing scheme of finished U-beam is formulated and implemented,and the research results can provide experience for the prefabrication production of U-shaped beams.
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