Causes of Long-Term Deflection in Prestressed Concrete Continuous Beam Bridges and Engineering Control Measures
预应力混凝土连续梁桥长期下挠病害成因及工程控制对策

摘要

随着预应力混凝土连续梁桥的建设规模扩大，由于混凝土连续梁桥长期下挠导致的交通事故时有发生。导致预应 力混凝土连续梁桥长期下挠的关键因素包括方案设计的合理性、环境温湿度变化、人为施工作业等，以上因素都会直 接作用于预应力混凝土连续梁桥的运行过程，增加梁体下挠的潜在风险。本研究探讨预应力混凝土连续梁桥长期下挠 的病害成因，结合工程实例给出可行的控制对策。通过本次研究得出，防范与控制预应力混凝土连续梁桥的长期下挠 病害应遵循因地制宜的基本原则，增进工程设计单位、施工部门、运维机构之间的沟通协调。

Abstract

With the expansion of the construction scale of prestressed concrete continuous beam bridges, traffic accidents caused by long-term deflection of such bridges have occurred from time to time. The key factors leading to long-term deflection in prestressed concrete continuous beam bridges include the rationality of scheme design, changes in environmental temperature and humidity, and human construction operations. These factors directly affect the operation of prestressed concrete continuous beam bridges and increase the potential risk of beam deflection. This study explores the causes of long-term deflection diseases in prestressed concrete continuous beam bridges and proposes feasible control measures based on engineering cases. The study concludes that the prevention and control of long-term deflection diseases in prestressed concrete continuous beam bridges should follow the basic principle of adapting measures to local conditions and strengthen communication and coordination among engineering design units, construction departments, and operation and maintenance organizations.