摘要
大跨径预应力混凝土连续箱梁悬臂浇筑施工过程中,施工控制是个复杂的动态系统工程,是实现大桥成桥线形、内力满足设计要求的重要手段.结合南京长江第二大桥北汊桥主桥施工控制实践,阐述了悬臂浇筑施工过程中的施工控制原理、方法和分析计算理论,研究了双幅桥混凝土箱梁的温度分布特性以及高强混凝土水化热温度的控制,科学地指导了施工.使全桥10个合拢段的合拢轴线误差小于或等于4mm,标高误差小于或等于23mm,成桥线形均在设计允许误差范围内.克服了高强度混凝土水化热产生的龟裂和强度损失的现象.
During cantilever casting of long span prestressed concrete continuous box beams, the construction control, a complicated and dynamic system engineering, is an important measure for bridges to ensure their lineament and to meet the design requirement of the internal force. In combination with the practice of construction of the main section of the north branch of the Second Nanjing Yangtze River Bridge, a discussion is made on the principle and method for construction control and the theory of calculation for cantilever casting, and a study is made on the characteristics of temperature distribution along the concrete box beam of the double deck bridge and hydration heat temperature control of highstrength concrete. The research provides a scientific guidance to the construction, and makes the axial closure error of all the ten closure sections smaller than 4mm, the elevation error smaller than 23mm, and the lineament error of the bridge within its design range. The construction control technology effectively overcomes cracking and strength loss of high strength concrete induced by hydration heat.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第6期669-673,共5页
Journal of Hohai University(Natural Sciences)
