New-old bridge transverse reinforced steel frame for broadening modification of hollow slab bridge and construction process

Abstract

The invention provides a new-old bridge transverse reinforced steel frame for broadening modification of a hollow slab bridge and a construction process. The hollow slab bridge is arranged longitudinally and comprises old bridge hollow slabs and new bridge hollow slabs. The new bridge hollow slabs are arranged on one side or two sides of the old bridge hollow slabs. Hinge joints are arranged among the hollow slabs. The bottom portions and the top portions of the old bridge hollow slabs and the new bridge hollow slabs are connected through transverse connecting devices arranged transversely. Each transverse connecting device comprises transverse connecting construction members connected with the bottom portions and the top portions and vertical connecting pieces of the transverse connecting construction members, wherein the vertical connecting pieces are connected with the bottom portions and the top portions. The transverse connecting construction members are reinforced steel construction members, and the reinforced steel construction members at the bottom portions of the hollow slabs are made of structural steel or steel plates. The construction process is simple and good in operability, facilitates quality control and improves construction quality and durability of broadening modification of the hollow slab bridge.

Description

technical field [0001] The invention relates to the field of bridges, in particular to a frame body and a construction process for widening and reconstructing hollow slab bridges. Background technique [0002] With the rapid development of the economy, the traffic volume of major expressways in our country is increasing day by day, and the reconstruction and expansion projects have become a hot spot in the construction of expressways. Among them, the prefabricated simply supported slab bridge has become the focus of bridge reconstruction and expansion. Bridge widening and reconstruction can be designed in the form of separating the old and new bridges, but the connection of the upper structure and the disconnection of the lower structure is the mainstream form of splicing the new and old hollow slab bridges in the reconstruction and expansion of expressways in my country. The horizontal connection methods of the upper part of the old and new bridges are usually connected by ...

AI Technical Summary

Problems solved by technology

However, the results are not satisfactory. The longitudinal joints at the junction of the old and new bridges and the old bridge side slabs adjacent to the new bridge side slabs often experience stress on the single plate.

[0003] The main reason why the lateral connection between the old and new slabs in the hollow slab bridge is easily damaged is that the current design codes have undergone major changes in the design standards and load value requirements, and the cross-sectional form of the hollow slab has also changed accordingly. The commonly used double-hole plate with small groove and groove has been replaced by a single-hole plate with large groove and groove. Effects such as shrinkage and creep will also lead to a significant decrease in the stiffness of the old slab, so there is a large difference in the stiffness of the old and new slabs, and the lateral distribution of the load will suddenly change at the junction of the old and new, resulting in a large shear force at the junction of the old and new slabs. There is a relative displacement between the old and new slabs, which will cause the longitudinal joints of the bridge deck at the joints of the old and new slabs, and the stress on the old bridge side slabs.

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