虎门大桥墩、塔、锚GPS施工测量

GPS Construction Survey of the Piles, Towers and Anchorages of Humen Bridge

介绍在工程全长１５ ．６ ｋｍ 、主桥长４ ．５８ ｋｍ 的虎门大桥建设中，利用ＧＰＳ定位技术进行桥梁的施工放样。实践证明，ＧＰＳ定位技术确定的悬索桥索塔、锚锭、连续刚构桥主墩和西岸引桥高墩的平面和高程点位误差和相对点位误差均满足桥梁施工规范要求。同时也说明在沿海平坦地区。

Humen bridge has a total length of 15.6 km and a main bridge length 4.58 km. In this paper, the construction survey of Humen bridge conducted by GPS positioning technique is introduced. Practice proves that the layout precisions of the cable support towers and anchorages of the suspension bridge, the main piers of the continuous rigid frame bridge, and the piers of the west approach bridge are fulfilled to the bridge construction specifications. It also shows that GPS datum transformation by using 'construction ellipsoid' in coastal plains can obtain satisfactory applicable results for bridge construction survey.