Construction method of fabricated pre-tensioned pre-stressing corrugated steel web composite box beam
A corrugated steel web and prestressing technology, applied in the field of bridge construction, can solve the problems of easy transportation, hoisting and post-maintenance, and achieve the effects of easy transportation and hoisting, reducing engineering volume, and avoiding poor stability.
Active Publication Date: 2017-06-27
河南中鼎智建科技有限公司 +1
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[0005] The present invention provides a construction method of assembled pretensioned prestressed corrugated steel web composite box girder, aiming to solve the problems of transportation, hoisting and post-maintenance when the existing corrugated steel web PC composite box girder is applied to large bridges aspects of the problem
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Embodiment Construction
[0030] The construction method of the pre-tensioned prestressed corrugated steel web composite box girder of the present invention mainly comprises the following steps:
[0031] In the first step, according to the design requirements of the bridge, an inverted trapezoidal beam unit (such as figure 1 Shown) with precast concrete top slab, prestressed concrete bottom slab and corrugated steel web:
[0032] Specifically, prefabs such as figure 2 For the prefabricated concrete roof 1 shown, the roof reinforcement mesh with longitudinal connecting bars and stud notches 1.1 is first bound, and the stud notches 1.1 are arranged on both sides of the roof reinforcement mesh at longitudinal intervals, and then the top of the pier is loaded. The bending moment prestressed channel 1.2 is installed in the steel mesh of the roof, and then the limit formwork is installed, and the concrete is poured; after the concrete reaches the design strength, the limit formwork is removed.
[0033] pr...
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The invention discloses a construction method of a fabricated pre-tensioned pre-stressing corrugated steel web composite box beam. The fabricated pre-tensioned pre-stressing corrugated steel web composite box beam comprises a composite beam body formed by longitudinally connecting a plurality of prefabricated beam body units, and each prefabricated beam body unit comprises a concrete top plate, a pre-stressing concrete bottom plate and a corrugated steel web which are singly prefabricated and is of an inverted trapezoidal structure that the width of the concrete top plate is larger than that of the pre-stressing concrete bottom plate, and the corrugated steel web is obliquely arranged. Each concrete top plate is internally provided with a longitudinal connecting rebar and a pre-stressing hole canal, and a plurality of upper toggle pin notches are formed in the two sides of each concrete top plate in a spaced mode in the longitudinal direction; each pre-stressing concrete bottom plate is internally provided with a longitudinal connecting rebar and a pre-tensioned pre-stressing steel cable, and a plurality of lower toggle pin notches are formed in the two sides of each pre-stressing concrete bottom plate in a spaced mode in the longitudinal direction; and the upper end and the lower end of each corrugated steel web are separately provided with frange plates with toggle pin groups in a welded mode. According to the construction method of the fabricated pre-tensioned pre-stressing corrugated steel web composite box beam, beam erection is conducted by adopting the structural mode of blocking prefabricating assembly, the sizes and weights of all parts are small, transporting is stable, hoisting is safe, and construction is facilitated.
Description
technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for an assembled pretensioned prestressed corrugated steel web composite box girder suitable for large bridges. Background technique [0002] Traditional prefabricated box girder webs are mostly made of concrete, which is heavy and easy to crack. Therefore, concrete box girders are only suitable for highway bridges with small spans (less than 40m). Corrugated steel web PC composite box girder bridge is a new type of bridge structure that appeared in the 1980s. The corrugated steel web used in it has excellent stability and the characteristics of not resisting axial force, so that the prestress can be effectively Loaded on the precast concrete roof and prestressed concrete floor; in addition, corrugated steel web PC composite box girder bridges are easy to construct and can effectively shorten the construction period, so they are widely used in la...
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IPC IPC(8): E01D2/04E01D21/00E01D101/28
CPCE01D2/04E01D21/00E01D2101/28E01D2101/32
Inventor 李斐然杜战军马亚丽孙炜玮付大喜
Owner 河南中鼎智建科技有限公司
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