顶管下穿河流施工安全风险控制技术
2018-08-29陈建东
陈建东
摘要: 随着城市建设的快速发展,地下空间开发规模越来越大,近年来为合理开发地下空间、解决马路拉链等问题,综合管廊建设迅速增多,因顶管技术较好的经济适用性,在综合管廊施工中得到广泛应用。随之而来的是各类安全事故不断涌现,怎样将事故伤害与损失降到最低,成为目前顶管施工亟需解决的问题。本文以具体项目为研究对象,对顶管下穿河流施工安全风险控制技术进行研究,对降低事故概率,做好地下空间施工项目的风险管理有着较好的参考意义。
Abstract: With the rapid development of urban construction, the scale of underground space development is getting larger and larger. In recent years, in order to rationally develop underground space and solve zippers on roads, the construction of integrated pipe galleries has rapidly increased. Due to the better economic applicability of pipe jacking technology, it has been widely used in the construction of integrated pipe galleries. Followed by the continuous emergence of various types of safety accidents, how to minimize the accident damage and losses, has become an urgent problem to solve the current pipe jacking construction. This paper takes the concrete project as the research object, carries on the research to the pipe jacking under the river construction safety risk control technology, has good reference significance for reducing the probability of accident and managing the risk of underground space construction project.
关键词: 下穿河流;顶管;风险;控制
Key words: underpass river;pipe jacking;risk;control
中图分类号:TV554 文献标识码:A 文章编号:1006-4311(2018)21-0091-03
1 工程概况
为了缓解电力供应问题,沈阳市开展相关电力工程建设,投资5.5亿元,建成220千伏的“五爱输变电工程”,该项目跨浑河段主要采用顶管工艺进行施工。
本工程中顶管施工所穿越的土层以富水砂卵石地层为主,其中地层超过70%的含砂卵石。顶管覆土的最小深度为9.358m,最大深度为18.724m。项目施工地质环境比较复杂,顶管直径较大,顶进的距离较长,因此在顶进的过程中面临着顶进困难、地表塌陷、顶管开裂以及漏水等一系列的施工安全风险。
2 水文地质情况
顶管穿越浑河段区间在浑河北岸设置3号工作井,经下穿浑河后,至浑河南岸滨堤南侧的4号工作井,区间全长836.504m。工程站位纵断面如图1所示。
在勘察期内,量测到地下的稳定水位:浑河的北岸(里程K0+0~K0+470)为10.9~18.7m,水位的标高为27.71~31.93m。根据历史经验数据,该地区地下水位年变幅为1.0~2.0m,跨浑河区间水位变幅按照2.0m考虑。……
