Construction method of cast-in-place steel-concrete composite beam of double-girder longitudinal one-way plate

Abstract

A construction method of a cast-in-place steel-concrete composite beam of a double-main-beam longitudinal one-way plate comprises the following steps that A, during construction, steel structure cross beams are erected between two I-shaped steel main beams, a bottom steel plates is laid between the two adjacent steel structure cross beams, and PBL shear key small I-shaped steel is welded to the bottom steel plates; B, transverse shear-resistant steel bars penetrate into and are fixed to hole positions of web plates of the PBL shear key small I-shaped steel, and then longitudinal fixing steel bars are fixedly erected on the transverse shear-resistant steel bars; transverse stability maintaining reinforcing steel bars are welded to the top edges of the PBL shear connector small I-beams, then bridge deck slab longitudinal load-bearing reinforcing steel bars are erected above the transverse stability maintaining reinforcing steel bars, and bridge deck slab transverse load-bearing reinforcing steel bars are erected on the longitudinal load-bearing reinforcing steel bars; and C, after building is completed, the pouring sequence on the bottom steel plate is that concrete pouring is conducted on a side fulcrum area and a midspan area firstly, and finally concrete pouring is conducted on a mid-fulcrum area. The construction method is easy to implement, follow-up repair is facilitated, and the built composite beam is low in cost, stable and reliable.

Description

technical field [0001] The invention relates to bridge engineering technology, in particular to a construction method of a cast-in-place steel-concrete composite beam with double main girder longitudinal one-way slabs. Background technique [0002] In the design of highways and municipal bridges, especially when there are roads or waterways on the upper span, the steel-concrete composite beam structure is more and more widely used. Conventional steel-concrete composite girder decks are usually horizontal one-way slabs, which have the following disadvantages: [0003] 1) The number of steel girders is determined by the bridge width. The more the number of lanes, the more steel girders need to be used in order to reduce the transverse span of the bridge deck, resulting in a large amount of steel used for steel-concrete composite girders; [0004] 2) When the bridge deck is a horizontal one-way slab, in order to ensure the durability of the bridge deck, it is usually necessary...

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Problems solved by technology

[0003] 1) The number of steel girders is determined by the bridge width. The more the number of lanes, the more steel girders need to be used in order to reduce the transverse span of the bridge deck, resulting in a large amount of steel used for steel-concrete composite girders;

[0004] 2) When the bridge deck is a horizontal one-way slab, in order to ensure the durability of the bridge deck, it is usually necessary to set up transverse prestressing, the construction process is cumbersome, and the bridge deck needs to be replaced as a whole in the horizontal direction after the bridge deck is damaged in the later stage, blocking traffic;

[0005] 3) When the bridge deck adopts cast-in-place, concrete formwork needs to be installed, and the construction cost is high;

[0006] 4) When the bridge deck adopts prefabricated slabs, cast-in-place joints are required between the prefabricated slabs, and the durability of the cast-in-place joints is poor, which is not as good as the overall pouring;

[0008] 6) Larger steel bars are required in the vertical and horizontal directions to ensure crack resistance, and the amount of steel bars is large

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