预应力连续箱梁底板开裂原因及解决对策研究  

Research on the Causes and Solutions of Bottom Plate Cracking of Prestressed Continuous Box Girder

作　　者：周婕 Zhou Jie(The Direct Branch of Nanchong Highway Administration Bureau,Chengdu,Sichuan 637000)

机构地区：[1]南充市公路管理局直属分局,四川成都637000

出　　处：《现代工程科技》2025年第4期17-20,共4页Modern Engineering Technology

摘　　要：预应力连续箱梁底板开裂问题对桥梁结构的安全性造成了严重威胁,其成因较为复杂,主要包括预应力不足、混凝土收缩过大、温差梯度作用等。针对以上问题,提出优化预应力布置、采用低收缩混凝土、设置温度筋、加强早期洒水养护及严控支架下沉量等一系列解决措施。研究表明,相关对策能有效增强底板的抗裂性能,为预应力连续箱梁结构的质量管控提供实践指导。The cracking problem of the bottom plate of prestressed continuous box girders poses a serious threat to the safety of bridge structures.Its causes are relatively complex,mainly including insufficient prestress,excessive concrete shrinkage,and temperature difference gradient effects.In response to the above problems,this article will propose a series of solutions,such as optimizing the prestress layout,using low-shrinkage concrete,setting temperature-resistant steel bars,strengthening early-stage sprinkler curing,and strictly controlling the settlement of the support.The research shows that the relevant countermeasures can effectively enhance the crack-resistance performance of the bottom plate and provide practical guidance for the quality control of prestressed continuous box girder structures.

关 键 词：预应力连续箱梁 底板开裂 原因及解决对策 

分 类 号：K928.78[历史地理—人文地理学]