中国特高压输电线路杆塔基础关键技术研究ppt课件

China started the UHV transmission study since 1986. Some subject researches and achievement have been developed since then. 中国对特高压输电技术研究始于20世纪80年代，取得了一批重要科研成果。 At the end of 2004, the State Grid Corporation of China (SGCC) started researches on key technology of UHV, including power system analysis of UHV AC&DC transmission, engineering design, construction and test, and manufacture of main equipment, etc. 2004年底，国家电网公司启动了特高压输电工程关键技术研究，全面开展特高压交、直流输电的系统分析、工程设计、施工调试和主设备研究等方面研究。 The 1000kV Jindongnan-Nanyang-Jingmen UHV AC experimental pilot in China began to construct in 2006. 2006年8月，中国1000kV晋东南南阳荆门特高压交流试验示范工程开工建设，标志着我国特高压电网建设的序幕已经拉开。,Introduction引言,Basic Concerns During Designing设计和选型中主要考虑因素 Geological Condition 地质条件 Load Characteristic 基础荷载特性 Subsoil Properties 地基承载特性 Construction Method 基础施工方法 Transportation Condition 施工运输条件 Economy Consideration 经济性考虑 Environment Protection 环境保护因素,中国110500kV输电线路设计中考虑的故障顺序一般是直线塔直线塔基础悬垂绝缘子金具串转角塔转角塔基础终端塔终端塔基础导地线耐张绝缘子金具串，以上各组成部分之间的故障顺序通过相应的专业设计规范的安全系数或分项系数体现。 按我国规范设计计算得到的各类基础安全度是杆塔部分的1.2倍。,基础和上部结构的强度配合,In China, the usually accepted strength coordination sequence of major components for 110500kV transmission line is straight line tower structure, straight line tower foundation, suspension insulators and fittings, tension tower structure, tension tower foundation, dead-end tower structure, dead-end tower foundation, conductors and wires, tension insulators and fittings. The accident sequence of each part are externalize through safety coefficient and partial coefficients in technical code. Design principles for foundation and tower should be matched in the UHV transmission line engineering, which is implemented through the transfer of foundation loadings, So simple security reliability alternation for UHV transmission line foundation is not necessary.,Typical strength coordination of transmission line components,Uplift and lateral stabilities checked Equation基础上拔和倾覆荷载稳定性计算,基于可靠度理论的特高压基础设计,Reliability-based design ( RBD ) for transmission line structure foundations,Compression stress on foundation base基础下压承载,Foundation type selection基础选型原则与要求,Appropriate foundation type should be adopted to reduce lateral force and moment on foundation pillar, which can improve foundation bearing capacity and stress status. 选用合理的基础结构型式，改善基础受力状态 Properties of high bearing capacity and small deformation of undisturbed subsoil should be utilized sufficiently. Undisturbed soil foundations in accordance with local condition is recommended. 充分发挥地基自身承载特性，因地制宜采用原状土基础 In order to protect slope and reduce excavation area at tower location on slope of mountain ground, hills, scheme of combination of tower unequal legs with unequal foundations according to local condition is recommended. 注重环境保护和可持续发展战略，因地制宜选择全方位高低主柱基础和铁塔长短腿配合使用的杆塔基础技术方案。,Foundation optimization基础优化设计原则,It is similar to the ordinary EHV transmission line engineering that the major goal of UHV transmission line design optimization is to achieve a minimum cost for a given level of reliability and safety. Firstly, foundation type schematization should be made according to the loads and geological condition along the transmission line corridors. And then, design optimization of the same type foundation should be done to determine the size and structure of the foundation. Main contents include embedment depth, width or diameter of the foundation bottom, material and connection style with the tower structure, etc. during optimizing. 与一般超高压输电线路杆塔基础设计相同，特高压杆塔基础优化设计目标就是在保证工程安全和可靠性水平下使基础工程造价最低。首先需根据不同的地质条件和杆塔基础作用力规划出相对经济合理的基础类型。在同类基础中根据基础作用力和地质条件，以降低混凝土和钢材消耗指标为目标进行基础优化设计，设计基础尺寸和基础构造，从而确定基础工程量。基础设计优化的主要内容有基础埋深、底板宽（直径）、基础材料、基础与杆塔连接方式等。,Undisturbed soil foundation 掏挖类原状土基础,Foundation Style类 型,Calculation model 计算模式,Typical foundation types and schemes基础型式及其工程技术方案,Inclined man-digged base-enlarged foundation ( IMDBEF )斜掏挖基础,Typical foundation types and schemes基础型式及其工程技术方案,IMDBEF sufficiently utilize properties of high bearing capacity and small deformation of undisturbed soil, and has the merit of conventional column foundation. In addition, IMDBEF has the same pad and chimney foundation, which can reduce the lateral force on pad to a lower extend. Stress status of foundation column and pad is improved; 斜掏挖基础既具有直掏挖原状土基础的工程特性，又具有斜柱插入式基础主柱坡度与塔腿主材坡度一致的结构优点，可有效改善基础受力状态，提高基础稳定性。,Full-scale test of IMDBEF for UHV 斜掏挖基础,Typical foundation types and schemes基础型式及其工程技术方案,Rock anchor foundation 岩石基础,Rock anchor foundation type is the best choice in the light weathered rock subsoil in mountainous area. 在微风化和中等分化的岩石地基可因地制宜采用锚桩基础（直锚式和群锚式）和嵌固式基础,rock anchor foundation 岩石基础,泥沼、河网、塘地等地区和大跨越工程, Recommended Foundation Type: Pill foundation 、Micropile foundation,Foundations in Moor, river network, wetlands areas, large crossing transmission line, 推荐型式：常规灌注桩基础、微型桩基础,Typical foundation types and schemes基础型式及其工程技术方案,Pile foundation 桩基础,Common pile foundation 常规桩基础,Micropile foundation 微型桩基础,Typical foundation types and schemes基础型式及其工程技术方案,Technical scheme of unequal tower leg length with unequal foundation height 斜坡地形全方位铁塔长短腿和不等高基础设计,Foundation on sloping ground 斜坡地形杆塔基础,Design model and damage style 计算方法和破坏模式,Technical scheme 技术方案,Typical foundation types and schemes基础型式及其工程技术方案,According to geographical features of energy sources and loads in China, it is unavoidable that the UHV transmission lines will pass through the variously mining-affected areas, including types of to be mined, being mined and mined. Tower foundation scheme and designing countermeasures should be made to satisfy the requirements of the stability and deformation regulation. 特高压输电线路不可避免地需要经过煤矿规划区、开采及采空区等煤矿采动影响区。为减少煤矿采动影响区地表沉降、水平位移、倾斜等对线路基础的危害，可采用大板结构柔性基础以及联合式基础等方案。,Foundations in mining-affected areas 煤矿采动影响区杆塔基础,Raft foundation联合式基础,Flexible concrete foundation 技术方案,Environmental protection杆塔基础水土保持设计,应充分重视环境保护问题的重要性，从杆塔基础方案选择、特殊土地基处理等方面制定并采取相应的技术措施，提高我国特高压工程建设环境保护水平。,Significance of environmental protection in UHV transmission line engineer should be given sufficient consideration, technical steps of foundation type selection and special soil foundation treatment can be taken to improve environmental protection in UHV engineering.,Environmental protection杆塔基础水土保持设计,Style and layout of the drain system基面排水,Slope protection 护坡,Summary小结,Nowadays, according to geographical features of energy sources and power loads in China, UHV transmission has become the best choice because Chinese power demands increase rapidly with fast economic growth. Based on the tower foundation properties and its current status in China, the UHV transmission line foundation design methods, main principles for foundation type selection and optimization, calculation theory of typical foundation types and schemes, environmental protection countermeasures have all been introduced. All these research results are relevant to the optimal design of the UHV transmission line foundations in China, which is also useful to UHV transmission construction abroad. 特高压输电是国内外输电技术的重要发展方向，中国立足于国内杆塔基础工程现状所进行创新性研究成果为确保特高压输电线路工程建设安全可靠提供了技术支持。,谢 谢！,Thanks !,