长距离顶管工程造价控制分析
2018-07-27刘霞胡犀
刘霞 胡犀
摘要: 顶管施工技术作为非开挖施工技术,具有施工过程中不影响地面交通、对施工区域的居民生活影响小、施工周期短、综合成本低等优点,在城市地下管网、穿越铁路公路和河流等地下工程中得到了广泛的应用[1]。本文在顶管法施工技术理论的基础上,结合珠海市供水管网工程中顶管法施工实例,对长距离顶管施工的技术措施及造价进行了分析,为类似工程造价控制提供借鉴。
Abstract: As a non-excavation construction technology, the pipe-jacking construction technology has the advantages of not affecting the ground traffic during the construction process, having a small impact on the residents' lives in the construction area, short construction period and low comprehensive cost, etc., so it has been widely used in the underground works, such as underground pipe network of the city, crossing the railway, highway and rivers[1]. On the basis of the construction technology theory of pipe-jacking method and the construction example of pipe-jacking method in Zhuhai water supply pipe network project, this article analyzes the technical measures and construction cost of long-distance pipe-jacking construction, to provide reference for cost control of similar projects.
关键词: 长距离顶管;沉井;造价控制
Key words: long-distance pipe-jacking;caisson;cost control
中图分类号:TU723.3 文献标识码:A 文章编号:1006-4311(2018)17-0059-03
1 工程概况
珠海市某供水工程穿越磨刀门水道段采用D2420×24钢管顶管,由斗门岸侧设置的工作井直接穿越磨刀门水道顶至广昌泵站处设置的接收井,顶管全长2330m,属超长距离过江顶管。磨刀门水道临近入海口,水面宽阔,通航等级较高。河床面最低处标高为-8.88m,水深约10m左右,河道两侧堤岸以外自然地面标高在2.7~3.2m左右。河东岸现为已建成的广昌泵站厂区,西岸现为蕉地,两处场地均较开阔,道路交通较顺畅。
2 顶管施工工艺
本工程单次顶进距离超过2000m,属于超长距离顶管。根据本工程管线穿越水域的地貌特征、工程地质条件及水文条件和平岗一期顶管施工经验,从施工技术、施工工期、施工安全、施工环境等方面综合考虑,拟采用泥水平衡式顶管法施工工艺, 单根管节长度为10m,工作井直径16.0m,井深为26m,接收井直径8.0m,井深为25m。
顶管井位置地层为淤泥质粘土层,地下水位高,井体埋深大,拟采用沉井法施工工艺,不排水下沉,水下封底施工工艺。……
