摘要
为探讨摩擦型高强度螺栓施工质量控制方法,以矮寨大桥为背景,针对螺栓预拉力主要受扭矩系数和施拧扭矩的影响,从施拧工艺制定、高强度螺栓与栓接面抗滑移系数工地检验、扳手标定、扭矩的制定与控制、扭矩系数变化的应对措施方面探讨高强度螺栓施工质量控制。该桥采用扭矩法分初拧、终拧两步施拧螺栓;工地扭矩系数试验、施拧屈服控制试验及抗滑移系数试验结果均满足规范要求;采用紧扣法进行终拧扭矩检查;根据扭矩系数变化情况及温度、湿度变化趋势,及时调整施拧扭矩,并对螺栓表面进行工艺处理,降低了环境条件对扭矩系数的影响。结果表明,该桥高强度螺栓施工控制较好、螺栓连接可靠。
To study the method for construction quality control of the frictional high-strength bolts, the Aizhai Bridge is cited as an example. In view of the fact that the pre-tensioning forces of the bolts are mainly affected by the torque coefficients and tightening torque, the construction quality control of the bolts is studied mainly from aspects of the following countermeasures of for- mulation of the tightening workmanship, field inspection of the slip resistance coefficients of the bolts and bolted surfaces, calibration of the tightening spanners, formulation and control of the tightening torque and changes of the torque coefficients. The bolts of the cited bridge were tight- ened by the torque method in two steps of the initial and final tightening. The results of the field torque coefficient test, tightening yield control test and slip resistance coefficient test could all satisfy the relevant requirements in the codes. The final tightening torque of the bolts of the bridge was checked by the fastening method and the tightening torque was timely adjusted in pace with the changes of the torque coefficients and changing tendency of temperature and humidity. The surfaces of the bolts were process treated and the effect of the ambient conditions on the torque coefficients was therefore reduced. As a consequence, the construction quality control of the bolts of the bridge was good and the bolted connection was reliable.
出处
《桥梁建设》
EI
CSCD
北大核心
2012年第6期103-109,共7页
Bridge Construction
关键词
悬索桥
加劲梁
高强度螺栓
扭矩系数
施工控制
桥梁施工
suspension bridge
stiffening girder
high-strength bolt
torque coefficient
con- struction control
bridge construction
