大口径长距离输水管线技术经济分析要点

Key Points of Technical and Economic Analysis for Large-Diameter Long-Distance Water Conveying Pipelines

摘要:

在城市开发完备地区，由于土地价值高昂、建筑物密集，管道敷设越来越多地采用非开挖施工方式，如拖拉管、顶管和盾构等。为避开房屋地基、地下管线、下穿通道及地铁等深埋隧道工程，管道埋深可达20～30 m，大型输水工程的工作井直径甚至可达30 m。面对这类长距离、大口径输水管线工程，由于其管道路由复杂、设计难度大、施工条件苛刻，因此需要对其造价指标和技术经济方案进行比选。以上海市某原水输水管线工程为例，针对大口径、长距离输水管道采用的非开挖敷设工艺，以及采用不同施工方法而形成的超深工作井，开展经济指标分析，以期为同类管线工程的设计与决策提供参考。

Abstract:

In well-developed urban areas, the trenchless construction methods such as pipe pulling, pipe jacking and shield tunneling are increasingly adopted for paving pipelines in many areas because of high land value and dense buildings. To avoid the house subgrade, underground pipelines, underpasses, subways and deep-buried tunnel projects, the pipelines can be laid at depths of 20~30 m, and the shaft diameter of large-sized water conveying projects can even reach 30 m. For this kind of long-distance large-diameter water conveying pipeline projects, it is necessary to compare and select its cost indexes and technical/economic schemes due to its complex routing, many design difficulties and severe construction conditions. Taking a raw water conveying pipeline project in Shanghai as an example, the analysis of economic indexes is conducted on the trenchless paving technologies for the large-diameter long-distance water conveying pipelines and the ultra-deep working shafts built using the different construction methods, which provides a reference for the design and decision-making of the similar pipeline projects.