UHPC segmental beam prefabricating method

Abstract

The invention relates to a UHPC segmental beam prefabrication method. The method mainly comprises the steps of UHPC mix proportion design, UHPC complete set stirring equipment research and development, reduced scale model test design, long-line method prefabrication construction, UHPC steam curing system research and development and the like. The problems that guidance documents and construction specifications about UHPC structural design still do not exist at present, the structure and strength of the constructed precast beam are low, UHPC is applied to a large-span highway box girder bridge for the first time, the mixing proportion, stirring, transportation, pouring and maintenance processes do not have previous experience reference and guidance, the UHPC mixing proportion and special stirring equipment design and research and development need to be carried out, and UHPC transportation, pouring and maintenance process research verification work are conducted; the prefabricated linear shape of the segmental beam is difficult to guarantee, and the precision requirement is high; and the UHPC hydration reaction is violent, the 'heat-humidity-force' field of the beam body is complex, and the requirement on the maintenance condition is strict.

Description

technical field [0001] The invention relates to the technical field of segmental beam prefabrication, in particular to a UHPC segmental beam prefabrication method. Background technique [0002] As a kind of ultra-high performance concrete, UHPC has the superior properties of ultra-high strength, ultra-high resistance, ultra-high durability and volume stability, and is one of the hotspots of civil engineering research in the world. [0003] At present, a certain number of UHPC bridge structures have been built. However, there are still no guiding documents and construction specifications for UHPC structural design, and the prefabricated beam structure and strength obtained by construction are low. UHPC is first used in long-span highway boxes. For beam bridges, the mixing ratio, mixing, transportation, pouring, and maintenance processes have no previous experience for reference, and UHPC mixing ratios, special mixing equipment design and development, UHPC transportation, pour...

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Problems solved by technology

[0003] At present, a certain number of UHPC bridge structures have been built, but until now there are still no guiding documents and construction specifications for UHPC structure design, and the prefabricated beam structure and strength obtained by construction are low. UHPC is first applied to long-span highway box For beam bridges, the mixing ratio, mixing, transportation, pouring, and maintenance processes have no previous experience for reference, and UHPC mixing ratios, special mixing equipment design and development, UHPC transportation, pouring, and maintenance process research and verification work are required; and segmental beams are prefabricated The line shape is difficult to guarantee, and the accuracy is high; the UHPC hydration reaction is violent, and the "heat-humidity-force" field of the beam body is complex, and the maintenance conditions are strict.

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