夜间横跨江面大气垂直折光变化趋势的研究及应用  

Study and Application of Night Atmospheric Vertical Refraction

作　　者：黄腾[1] 陈建华[1] 岳荣花[1] 彭更生[2] 章登精[2] 

机构地区：[1]河海大学土木工程学院,南京210098 [2]南京长江第三大桥建设指挥部,南京210038

出　　处：《工程勘察》2008年第2期39-42,共4页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金资助项目(50279005).

摘　　要：特大型桥梁关键部位的施工控制通常选择在夜间进行,为了减弱测控中大气折光对工程质量的影响,选择合适场地,采用精密三角高程法研究了夜间江边大气垂直折光的变化趋势。试验结果表明,夜间江边的大气垂直折光变化复杂,无明显的规律,但在午夜23:00～凌晨2:00较为稳定,选择该时间段进行南京三桥钢索塔拼装精密测控,并采用固定棱镜现场实测大气垂直折光系数,修正观测结果,有效减弱了大气折光对施工测量的影响。Usually, the construction control of oversized bridge＇s key parts is carried oat at night. Beside the Yangtse River, in order to reduce the atmospheric refraction impact to guarantee project quality, a suitable site was chosen, and precise triangle elevation method used to study the change trend of atmospheric vertical refraction at night. The test results indicated that atmospheric vertical refraction varied complex at night, even no obvious law but relatively steady from 23 ： 00. pm - 2 ： 00. am. This time period was taken for carl＇ying out precise survey and construction control of tight-wire tower for Nanjing No. 3 Yangtse River Bridge. The fixed prism was used to survey atmospheric vertical refraction coefficient, it Could correct measurement and reduce the impact of atmospheric refraction on construction works.

关 键 词：夜间 大气垂直折光 变化趋势 测控 钢索塔 

分 类 号：U452[建筑科学—桥梁与隧道工程]