固增水电站首部枢纽设计变更分析与评价

Analysis and Evaluation on Design Change of Headworks of Guzeng Hydropower Station

大型水电站工程从初步设计阶段到施工设计阶段往往要经历几年时间,此时工程施工的外部条件可能会发生较大的变化。鉴于技施阶段与初设阶段设计精细化程度存在差异,因此,有必要通过更深入的设计、在满足规范及合同要求的前提下对初步设计报告进行适当的变更调整,以达到方便施工、节约投资、有利于风险控制的目的。固增水电站在设计施工图阶段对首部枢纽的布置进行了变更,主要变更内容包括:防渗布置、上游左岸导墙布置、进水口、泄洪、冲沙闸、护坦及海漫结构等,其变更调整遵循并响应了初步设计阶段和有关审批文件的规定,满足现行国家有关规程规范和招标文件的要求,布置合理,不影响建筑物结构运行安全。阐述了对固增水电站首部枢纽设计变更进行的分析与评价。在方便施工、节约投资、风险控制方面具有重要意义。

It often takes several years from the preliminary design stage to the construction design stage of a large-scale hydropower project,at which time the external conditions of the project construction may change considerably.Since there is a difference in design refinement between the technical construction and the preliminary design stage,it is necessary to make appropriate changes and adjustments to the preliminary design through more in-depth design on the premise of meeting the requirements of the specifications and contracts to achieve convenient construction,to save investment and to control risks.During the design and construction stage,the layout of the headworks has been changed.The main changes include:anti-seepage layout,upstream left bank guide wall layout,water inlet,flood discharge,sand sluice,apron and apron extension structure,etc.These design changes and adjustments follow and respond to the requirements of the preliminary design stage and the relevant approval documents,and meet the requirements of the current national relevant regulations and tender documents.The adjusted layout is reasonable and will not affect the safety of building structure operation.This paper introduces the analysis and evaluation of the design changes of the headworks of the Guzeng Hydropower Station.It is of great significance in terms of facilitating construction,saving investment and controlling risks.