Research On Crack Detection And Reinforcement Measures Of A2 Ramp Bridge In The Liujing West Hub Interchange

Prestressed concrete box girder bridge is widely used in city and highway Bridges, which has good mechanical performance, high bearing capacity, and high torsional stiffness. since it appearance, the prestressed concrete box girder has been widely used in bridge beam form, especially in long-span continuous girder bridge, almost all bridges adopted this kind of form. But due to factors such as design, construction, operation, prestressed concrete box girder are often working with cracks, which is contrary to design. At the same time,cracks reduce the bridge bearing capacity and durability, and the safety of the bridge, serious personal security and economic loss. Therefore it’s of great importance to carry out the study of prestressed concrete cracks.Paper on the basis of in-depth summary of the research status in China and abroad, summarized characteristics of web cracks, and has done depth research in the influence factors of web plate cracks, respectively from the prestressed, web plate thickness, temperature, shrinkage and creep, construction and maintenance, and many other factors affecting research the mechanism of cracks. Summed up the prestressed concrete continuous box girder structure fracture, can guide engineering significantly.After mastering the mechanism of cracks, and then discussed the web crack detection methods and reinforcement measures, focusing on strengthening measures, including grouting method, the method of pasting steel plate, external prestressing method, such as the various strengthening methods are introduced in detail the construction process and matters needing attention, and a variety of methods advantages and disadvantages and the reinforcement engineering effect after evaluation. Evaluate the reinforcement effect and combine with engineering example, has a guiding significance in bridge design and reinforcement of old bridges.