沿海地区通航运河内特大桥深基坑钢板桩围堰干封施工研究

STUDY ON DRY SEALING CONSTRUCTION OF STEEL SHEET PILE COFFERDAM FOR DEEP FOUNDATION PIT OF SUPER LARGE BRIDGE IN NAVIGABLE CANAL IN COASTAL AREA

通吕运河特大桥位于南通市二甲镇,桥梁全长1 121.7 m,其中主墩17、18号墩位于通吕运河内,左右幅主墩承台共4个,尺寸为纵向12 m、横向12 m、高度3 m,承台顶面高程–3 m,通吕河常水位+2.12 m,百年一遇洪水位3.86 m,300年一遇洪水位4.32 m。通吕运河已完成三级航道整治,两侧为人工直立护岸,工程河段水面宽约121.14 m、河底高程约–2.98 m,设计最高通航水位为3.3 m,最低通航水位为1.22 m,现状达到Ⅲ级航道标准。

Tonglu canal super major bridge is located in Erjia Town, Nantong City, with a total length of 1 121.7 m. The main piers 17 and 18 are located in Tonglu Yunhe river. There are four main pier caps on the left and right sides, with dimensions of 12 m in longitudinal direction, 12 m in transverse direction and 3 m in height.The top elevation of the caps is –3 m, the normal water level of Tonglu river is + 2.12 m, the 100 year flood level is 3.86 m and the 300 year flood level is 4.32 m. Tonglu canal has completed three-level channel regulation, with artificial vertical revetments on both sides. The water surface width of the project reach is about 121.14 m, and the river bottom elevation is about –2.98 m. The designed maximum navigable water level is 3.3 m and the minimum navigable water level is 1.22 m. The current situation meets the standard of class Ⅲ channel.