Prefabricated T-shaped beam and method of building continuous beam bridge by adopting prefabricated T-shaped beams

Abstract

The invention relates to a prefabricated T-shaped beam and a method of building a continuous beam bridge by adopting the prefabricated T-shaped beams, and belongs to the field of bridge engineering. The T-shaped beam is an improved form of the conventional prefabricated T-shaped beam, and bottom flanges are additionally arranged at the ends, so that the cross sections of the ends are I-shaped. Longitudinal prestressed ducts are formed in the bottom flanges, and the longitudinal prestressed ducts are also formed in top plates of the ends. The bridge is formed in a manner that the prefabricated T-shaped beams are spliced, simply supported and then connected. Longitudinal prestress is tensioned on the bottom flanges, and negative bending moment prestress is tensioned on the top plates. Certain prestress is exerted on compressed zones at the bottoms, so that cracks under the effects of temperature and the like can be avoided. The compression areas of the bottom flanges are increased, the compressive strain of the compressed zones is decreased under the effect of negative bending moment, correspondingly, the tensile strain at the tops is also decreased and thus the possibility of cracking of the bridge deck can be lowered. As the cross sections of the ends are changed to be I-shaped, transportation and installation are convenient, and the construction of the continuous beam bridge is also convenient. The method of building the continuous beam is convenient to construct, and cracks of the top plates at pier top areas are favorably decreased.

Description

Technical field [0001] The invention relates to a prefabricated T-beam and a method for constructing a continuous beam bridge with the prefabricated T-beam, belonging to the field of bridge engineering. Background technique [0002] With the rapid development of my country's high-grade highways, higher requirements have been placed on the quality of bridges. The current situation is: for small-span high-grade highway bridges, prefabricated reinforced concrete slab beams are mostly adopted, and for medium-span bridges, fabricated prestressed concrete T-shaped (box) beams are adopted. The current construction method mainly adopts balanced cantilever pouring method or assembling method. However, because the construction of cast-in-place continuous beams is complex and cumbersome, labor-consuming and time-consuming, people adopt the "simple support first and then continuous construction" method to combine the mass precast production of simply supported beams with the superior perfor...

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Problems solved by technology

In addition, although the bottom of the negative bending moment area is a compression area, due to the effect of temperature, etc., cracks often appear

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