A kind of prestressed steel wire rope shear reinforcement concrete box girder and reinforcement method thereof

Abstract

The invention discloses a prestressed steel wire rope anti-shearing reinforced concrete box girder. The prestressed steel wire rope anti-shearing reinforced concrete box girder comprises a reinforcing system arranged on the concrete box girder. The reinforcing system comprises a plurality of steel plate strips, and the steel plate strips are obliquely embedded and anchored to the two sides of a web of the box girder. The prestressed steel wire rope anti-shearing reinforced concrete box girder further comprises four steel angles, each of the four steel angles is fixedly installed on the bottom of a left flange, the bottom of a right flange and the bottom of an inner top plate of the box girder through its own edge, the other edge of each of the four steel angles is provided with a row of bolt holes in the length direction, and a plurality of adjustable bolts are correspondingly locked in the bolt holes of the steel angles in a one-to-one mode. On the outer side of the web of the concrete box girder, a steel wire rope tensionally winds around the girder bottom, the two ends of the steel wire rope penetrates through circular rings on the adjustable bolts to be anchored, and a steel wire rope hoop is formed. During reinforcing, prestress can be exerted on the steel wire rope through the adjustable bolts without a special tensioning instrument, construction is convenient, and the construction efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of reinforced concrete beam reinforcement, in particular to a prestressed steel wire rope shear-resistant reinforced concrete box girder and a method for strengthening the same. Background technique [0002] With the rapid development of my country's economy and society, large-span prestressed concrete box girder bridges are being built in Daxing. Because the box-shaped section has high torsional stiffness and good stability, it meets the requirements of modern construction methods. However, due to imperfect design theory, construction quality defects, The problem of repair and reinforcement of old bridges has become increasingly prominent due to load overloading and other reasons. Existing shear strengthening technologies for reinforced concrete beams mainly include enlarging section method, bonding steel reinforcement method, pasting fiber composite material reinforcement method, adding fulcrum reinforcemen...

AI Technical Summary

Problems solved by technology

The existing reinforcement methods have the following problems: (1) There is a stress hysteresis effect between the reinforcement material and the original component, and the joint work ability is poor, which greatly affects the reinforcement effect; (2) The anchorage length at the end of the reinforcement material is not enough, and it is easy to find the peeling of the anchor end damage, unable to give full play to the strength of the material; (3) increase the cross-sectional size of the original component, increase the self-weight, and affect the view and use

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