三线长距离钢顶管并排顶进施工
2012-10-15苏俊赵宁
苏俊 赵宁
摘要:顶管沿线的华东路作为上海景观道,工程质量、安全、文明施工要求高;上海银行数据处理中心坐落于此,传输着通往各大银行的信息数据,因此在此施工社会责任重、影响大;顶管沿线多次穿越管线、河浜、公路、民房及古建筑上海财神庙,因此穿越过程中变形、沉降控制要求高;此段三线顶管并排顶进为全国首例,三线长距离钢顶管工艺不成熟、工序繁多、质量控制因素环环相扣。
关键词:三线长距离钢顶管、并排顶进、科技攻关
Abstract : The East Road along pipe as the Shanghai landscape road, its engineering quality, safety and civilized construction have the high requirements; the Shanghai Bank data processing center is located here, it transmits the information data to each big bank, so constructing here has the heavy social responsibility and big impact; the pipe line crosses pipeline, creeks, roads, houses and the ancient building Shanghai Wealth God Temple, so the requirements of the deformation and subsidence control are high in the process ; the three line pipe jacking side by side is the first in China, three lines long distance steel pipe technology is not mature, and it has many processes and quality control factors, and all these link closely.
Key words: three lines long distance steel pipe jacking; side by side; science and technology research
中图分类号:TU74文献标识码:A文章编号:2095-2104(2012)
1.工程概况
青草沙水源地原水工程是解决上海市市民用水的一项市重大工程,也是一项为民造福的民心工程。目前严桥、金海、凌橋支线已贯通并投入运营,供水范围覆盖上海大部分地区,收益人口超过1000万。为了使这项工程惠及上海更多地区,青草沙南汇支线应运而生。
本工程最长单线距离为987m,最短为91m;钢管采用Q235B镇静钢,为螺旋焊缝卷管,DN2000管道外径2020mm,壁厚20mm;DN1800管道外径1820mm,壁厚18mm。两根DN2000管道中心间距为5.00m,DN1800与DN2000管道中心为4.0m。
南汇支线在设计上推陈出新,在全国首次提出了三线顶管并排顶进的设计理念。
2.施工控制
2.1长距离顶进前设置模拟试验段
为确保长距离顶管顺利顶进,本工程将91m、137m两段短距离顶管作为三线并排顶进的模拟试验段,通过试顶进,来掌握穿越土层特性、摸索、优化顶进施工参数,并通过两段试验段不同的顶进顺序安排,结合地面沉降变形规律、进行模型受力分析,在确保周边环境安全的情况下以合理工序布置来提高顶进效率。……