Construction method of shear resistance and strengthening of concrete box beams based on corrugated steel webs

Abstract

The invention discloses a construction method of shear resistance and strengthening of concrete box beams based on corrugated steel webs. The construction method successively comprises the following steps: performing construction lofting and positioning on top plates and bottom plates of box beams; performing and strengthening bonding surfaces; drilling anchor bolt holes in the bottom surfaces of the top plates of the box beams; drilling holes and planting steel bars in the top surfaces of the bottom plates of the box beams; performing laying-off on the corrugated steel webs; drilling holes and performing polishing on upper flange plates; welding and mounting the corrugated steel webs; mounting reinforced mesh slices; erecting a model and pouring concrete. The construction method disclosed by the invention has the advantage that the purposes of shear resistance and strengthening of the concrete box beams are achieved by mounting longitudinal corrugated steel web components in box chambers of box beams, increasing the number of webs of the box beams and reducing the main tensile stress of original concrete webs of the box beams.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a construction method for shear reinforcement of concrete box girders based on corrugated steel webs. Background technique [0002] At present, the concrete box girder bridge has become one of the main types of long-span bridges in my country. However, due to deficiencies or defects in design, construction, and operation management, a large proportion of long-span prestressed concrete box girder bridges currently in service have web oblique cracks, which have directly threatened the durability and safety of bridges. [0003] In order to restrain the further development of oblique cracks in the web and improve the shear resistance of the bridge, existing reinforcement methods include pasting steel plates or carbon fibers on the web of the box girder, tensioning the vertical prestress, and enlarging the cross-section of the web, etc. Among them, although the...

AI Technical Summary

Problems solved by technology

However, due to deficiencies or defects in design, construction, and operation management, a large proportion of long-span prestressed concrete box girder bridges currently in service have web oblique cracks, which have directly threatened the durability and safety of bridges.

[0003] In order to restrain the further development of oblique cracks in the web and improve the shear resistance of the bridge, existing reinforcement methods include pasting steel plates or carbon fibers on the web of the box girder, tensioning the vertical prestress, and enlarging the cross-section of the web, etc. Among them, although the construction of pasting steel plates or carbon fibers is simple, the improvement of the shear bearing capacity is limited, and the aesthetics of the bridge is affected; the vertical tension prestress construction is difficult, and it faces problems such as prestress loss; The slab section will greatly increase the self-weight of the bridge, causing additional load effects on the bridge

Moreover, none of the above three methods can significantly improve the original shear force distribution state of the box girder web

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