Prefabricated assembled cover beam structure and construction method using steel shear key

Abstract

The invention relates to a prefabricated assembly cap beam structure with steel shear keys and a construction method. The steel shear keys of the prefabricated assembly cap beam structure adopt female and male pairing type shear keys, and are formed by casting nodular cast iron or high-quality carbon structural steel. The construction method comprises the following steps of dividing a cap beam into members which are respectively prefabricated in three sections, embedding a female type shear key at a splicing part of two outer hanging sections, and embedding a male type shear key at a splicing part of a middle section; enabling a crane to respectively lift the member in the middle section and the members in the two outside sections, calibrating positions, penetrating and tensioning a prestressed reinforcement in a first phase to connect the three sections into a whole, and completing the grouting, sealing and anchoring of a prestressed hole passage; by utilizing the reserved grouting hole passage, grouting the interior of the female type steel shear key at high pressure, and treating a joint between the female and male shear keys. Compared with the prior art, the prefabricated assembly cap beam structure and the construction method have the advantages that the complexity of formwork manufacturing in the prefabricating phase of the traditional large and small shear keys is decreased; by adopting the female and male pairing type, the positions in the lifting process are conveniently determined, and the engaging between the members is effectively promoted.

Description

technical field [0001] The invention relates to a prefabricated cover beam structure, in particular to a prefabricated cover beam structure and a construction method using steel shear keys. Background technique [0002] The cast-in-place construction of concrete bridges requires a large number of formwork and support systems. Under unfavorable construction conditions, it is not feasible to erect a full-height bracket. The construction of the cover beam belongs to high-altitude operations, and a large amount of concrete is poured on site, so the construction risk is high. The method of prefabricated and assembled cover beams can speed up the construction speed and ensure the quality, and at the same time, it is very economical considering the scale effect. [0003] At this stage, the shear design of prefabricated bridge assembly mainly adopts toothed shear keys, which are specifically divided into large shear keys and small shear keys. The disadvantage is that the prefabric...

AI Technical Summary

Problems solved by technology

Its disadvantage is that the prefabricated formwork needs to be shaped with concave-convex edges and corners, the construction is complicated, and the degree of occlusal matching is not high

Images