Shear-resistant reinforcing method for small-section hollow beam

Abstract

A shear-resistant reinforcing method for a small-section hollow beam Is characterized in that shear-resistant reinforcement of a hollow beam is achieved by forming a hole in the bottom of the hollow beam, burying a pipe, arranging a plugging object to plug the inner end of a cavity of a to-be-reinforced area, pouring a reinforcing body into the cavity of the to-be-reinforced area of the hollow beam, drilling the bottom of the hollow beam from bottom to top and implanting shear-resistant steel bars penetrating through the reinforcing body and the bottom plate and the top plate of the hollow beam. The method can be achieved on the premise that traffic is not interrupted, the appearance of the hollow beam is not changed, the connecting keys effectively connect the reinforcing body and the existing beam body into a whole, the shear-resistant steel bars and the reinforcing body act together, the shear-resistant bearing capacity of the hollow beam is improved, the reinforcing effect is greatly improved, the operation steps are simple, and the construction efficiency is high.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a bridge reinforcement method, in particular to a small-section hollow beam shear reinforcement method. Background technique [0002] Hollow girder bridges are widely used in medium and small span bridges due to their simple structure, convenient transportation and construction, light weight and high degree of prefabrication. In my country's small and medium-span bridges with a span of less than 20m, most of the cross-section forms are hollow slab girders; for medium-span bridges, small hollow box girders are another commonly used structural form. Hollow slab girders and hollow small box girders both have hollow characteristics, and can be collectively referred to as small-section hollow beams. Small-section hollow beams are one of the most common bridge structures in my country. [0003] With the development of transportation, the traffic volume is increasing, and the load value ...

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Problems solved by technology

[0003] With the development of transportation, the traffic volume is increasing, and the load value of the bridge structure is also greatly increased. The increase of the load causes its bending and shearing bearing capacity to be insufficient. If the bridge with insufficient bearing capacity is directly demolished Reconstruction is not only a waste of resources, but also requires interruption of traffic, high cost and long construction period, so reinforcement is usually used to increase its bearing capacity

For small-section hollow beams, if the bending capacity is insufficient, it is easy to implement reinforcement at the bottom of the beam; if the shear capacity is insufficient, commonly used reinforcement methods such as enlarging the section, external prestressing reinforcement, pasting The steel plate method and carbon fiber sheet reinforcement technology are difficult to implement, because the small cross-section hollow beams are usually closely connected in the horizontal direction, especially the horizontal hollow beams in the middle, which cannot provide the necessary operating space for shear reinforcement

[0004] In addition, if the concrete is simply poured into the small cross-section hollow beam, the post-cast concrete will not be effectively connected with the existing beam body, and it will be difficult to work together with the existing beam body, and the reinforcement effect will be poor

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