Prestress gradient section UHPC beam bridge

Abstract

The invention relates to a prestress gradient section UHPC beam bridge, including anupper structure, a lower structure, and a supporting seat arranged between the upper structure and the lower structure. The upper structure is composed of a baseplate and webs arranged on both sides of the baseplate. The upper structure is of an integral structure with a U-shaped cross section and is prefabricatedfromUHPC. Prestress pipelines are arranged on the webs. Different froma traditional beam bridge structurewhich usesabaseplate as a bearing member, a main beam of the prestress gradient section UHPC beam bridge adopts a U-shaped beam, the websare placed above a bridge deck,and the vertical websare taken as bearing members, so that the building height of the baseplate is greatly reduced, lightweightis achieved, and prefabrication, transportation and lifting are convenient.

Description

technical field [0001] The invention relates to a UHPC girder bridge with prestressed gradient cross section, which belongs to the technical field of bridge construction. Background technique [0002] Beam bridges are bridges with girders as the main load-bearing components. At present, in bridge construction, the prefabricated bridge decks of beam bridges usually adopt the structural form of I-beams, π-shaped beams or slab girders. The reinforced concrete structure has unavoidable shortcomings such as heavy structural weight (self-heavy), unfavorable transportation, and difficult hoisting. In addition, during on-site construction, the prefabricated bridge decks need to be connected as a whole through cast-in-place wet joints. The usual practice is that the upper and lower layers of the bridge deck are installed at the end of the prefabricated bridge deck. Extend out to a certain length, and the upper and lower steel bars of the outhanging part can be made into an integral ...

AI Technical Summary

Problems solved by technology

[0002] Beam bridges are bridges with girders as the main load-bearing components. At present, in bridge construction, the prefabricated bridge decks of beam bridges usually adopt the structural form of I-beams, π-shaped beams or slab girders. The reinforced concrete structure has unavoidable shortcomings such as heavy structural weight (self-heavy), unfavorable transportation, and difficult hoisting.

In addition, during on-site construction, the prefabricated bridge decks need to be connected as a whole through cast-in-place wet joints. The usual practice is that the upper and lower layers of the bridge deck are installed at the end of the prefabricated bridge deck. Extend out to a certain length, and the upper and lower steel bars of the outhanging part can be made into an integral closed type. In order to ensure the reliability of the connection force of the cast-in-place wet joint, generally the outstretching steel bars of adjacent bridge decks need to be close to each other and welded Together (in fact, there are as many as 200 or more unilaterally protruding steel bars on an ordinary beam—), so many steel bars need to be positioned successfully, which puts high requirements on the accuracy of hoisting of large-scale structures, and hoisting often occurs During the process, the steel bars collide with each other and break, and even the prefabricated bridge deck is damaged by the corners and defects after being hit by the steel bars, which affects the structural quality. In addition, a large amount of labor costs for welding workers are required on site, so the construction period on site is relatively long

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