摘要
管幕工程是港珠澳大桥珠海连接线拱北隧道口岸暗挖段难度最大的项目之一,其特点是距离长、直径大、管幕轨迹位于曲线上,同时顶管精度要求高,施工难度大。工程下穿拱北口岸限定区域,埋深4~5 m,管幕平均长度257.92 m,由36根φ1620 mm的钢管组成。线路位于缓和曲线和圆曲线组成的组合曲线上,圆曲线半径约890 m,管节轨迹精度要求±50 mm,地表沉降要求小于30 mm,管幕所处地层地质条件复杂,周边环境敏感。从顶管机选型、顶进阶段划分、顺序和工艺控制等方面做了详细介绍。
The pipe-roofing project was one of the most difficult projects of undermining-method section of Gongbei Tunnel Port of Zhuhai connecting line of Hong Kong-Zhuhai-Macao Bridge. This project was characterized by long distance, large diameter, curved pipe-roofing path, high accuracy requirement of pipe jacking, and numerous difficulties in construction. Moreover, this project passed beneath the defined area in Gongbei Tunnel Port, with a burial depth of 4 to 5 m and an average pipe-roofing length of 257. 92 m, and consisted of 36 steel pipes in the form of 1 620 mm diameter per pipe. The railway line was located on a hybrid curve which was made of a transition curve and a circular curve with about 890 m radius, where the requirement on the path accuracy of pipe segment was within ± 50 mm and the requirement on ground surface settlement was less than 30 mm. In addition, the geological condition of the soil strata where the pipe-roofing project passed through is very complex, and the surrounding environment is sensitive. This paper expounded relevant issues, including how to select the type of pipe jacking machine, how to divide the stages of jacking construction, how to control the operation sequence and technical process of jacking construction.
出处
《铁道标准设计》
北大核心
2014年第8期114-120,共7页
Railway Standard Design
关键词
海底隧道
曲线顶管
F型接头
测量控制
精准控制
subsea tunnel
curved pipe-jacking
F-shaped joint
measurement control
accuracy control
