Structure for continuous transformation of existing simply supported hollow slab girder bridge and construction method of structure

Abstract

The invention relates to a structure for continuous transformation of an existing simply supported hollow slab girder bridge. The structure comprises two hollow slabs and a pier of the existing simply supported hollow slab girder bridge, wherein part of top plates and part of web plates of the two adjacent hollow slabs on the top of the pier are removed through chiseling along the bridge direction; a Y-shaped seam is formed between the end parts of the two chiseled hollow slabs; reinforcing steel bars are laid and concrete is poured in the Y-shaped seam to form a continuous section connected with the two hollow slabs; and a bridge deck pavement is poured on the two hollow slabs and the continuous section again. The invention also relates to a construction method for the continuous transformation of the simply supported hollow slab girder bridge. According to the invention, a feasible and effective guidance method is provided for the continuous transformation of the existing simply supported hollow slab girder bridge, complex construction caused by prestress is avoided, and splits are effectively avoided. The structure is favorable in integrity, has good quake-proof and collapse-proof effects in earthquakes, and has the advantages of simplicity and convenience in construction and strong durability.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a structure and a construction method for the continuous transformation of an existing simply supported hollow slab girder bridge. Background technique [0002] The simply supported beam bridge is a statically indeterminate structure, which has the characteristics of clear force, simple structure, convenient construction, easy maintenance, and no additional internal force due to uneven settlement of the foundation. It can be applied to situations with relatively poor geological conditions. Hollow slab simply supported girder bridges are often built in our country. In order to adapt to temperature changes and structural deformation caused by load, porous simply supported girder bridges usually have expansion joints on each pier (platform). Bridge expansion joints are the most vulnerable and difficult to repair parts of bridge structures. From the end of 1989 to the begi...

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Problems solved by technology

Although the first two construction methods can improve the cracking of the bridge deck at the support to a certain extent, they cannot be fundamentally improved due to the small continuous space in the joint area and the low tensile strength of the filling material (such as concrete). Resist the negative bending moment generated at the joints after the simply supported beam is continuous, which will also lead to cracking of the bridge deck; while the construction method of bridge deck (slab) continuous + wet joint + prestress can be avoided by applying local prestress Cracking of the bridge deck, but this method is complex in construction, and applying prestress in a small area is likely to cause local stress concentration, and the loss of prestress is also large, and it is difficult to use in the reconstruction of old bridges

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