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1、摘 要沙溪口水电站计划建在福建省南平市上游的西溪上，是闽江流域的一个梯级电站，属于河床式水电站。本电站主要组成建筑物有溢流坝、非溢流坝、厂房和船闸。坝体型式为混凝土重力坝，溢流坝段布置于河床中部，厂房布置在河床右岸，船闸布置在左岸。水库正常蓄水位为86.20m，设计洪水位为87.00m，校核洪水位为88.50m，死水位为83.00m。非溢流坝坝顶高程90.00m，上游面坡度为1:0.2，下游面坡度1:0.75，溢流坝堰顶高程76.79m。溢流坝段全长349m，设有16孔溢流孔，每孔净宽取为19.00 m，沿主河槽宣泄绝大部分洪水。电站设计水头为13.97 m，总装机容量为270MW，安装有4台
2、轴流式水轮发电机组，每台装机容量为67.5MW。水轮机型号均为ZZ560-LH-900，转轮直径为9.0m，水轮机安装高程66.69m，发电机层高程82.71m，取安装场高程与发电机层同高。下游校核洪水位82.40m，主厂房顶高程为104.00 m， 220kV及300kV开关站布置在尾水平台右侧。船闸闸室100m13m2.5m（长宽最小水深），位于溢流坝左侧。沙溪口水电站具备发电，航运，过木等的综合效益，是福建电网的骨干电厂。关键字沙溪口水电站 河床式厂房 重力坝 溢流坝 水轮机 发电机 抗滑稳定性 轴流式水轮机 扬压力 发电机层结构设计AbstractShaxikou Hydropower
3、 Station is prepared to built at Xixi stream, upstream the city of Nanping in Fujian Province. It is one of the cascade development in the Minjiang river basin. It is a riverbed hydropower station.The main structures of Shaxikou Hydropower Station is consist of overflow spillway dam, non-overflow sp
4、illway dam, powerhouse and lock. The dams are concrete gravity dams. The overflow spillway dam lies in the centre of the riverbed. The powerhouse lies on the right, and the lock is located on the left. The normal water lever of the reservoir is 86.20 meters,while the design flood water level of the
5、reservoir reaches at 87.00 meters. The checking flood water level is about 88.50 meters. And the dead water level is only 83.00 meters.The top of the non-spillway dam is at an elevation of 90.00 meters. The upstream of the dam is vertical, the lower slope degree is 1:0.2,and the upper slope degree i
6、s 1:0.75. the crest of the weir is at an elevation of 76.79 meters. The overflow spillway dam is about 349 meters long in total, with 16 openings each of 19meters wide, discharging most of the flood flow along the main river channel.The design cross-head is 13.97 meters. The project has a total inst
7、alled capacity of 300MW. It houses four axial-flow turbines coupled with generators 70MW each. The type of the turbine is ZZ560-LH-900. The diameter of the turbine is9.00 meters. The runner setting is at an elevation of 66.69 meters. The generator floor is at an elevation of 82.71meters. And it is t
8、he same with the service or erection bay. However, the checking tailwater lever is 82.40 meters. The top of the powerhouse is at an elevation of 104.00meters,220KV anf 300KV switchyard is located on the platform at the right side of downstream tailrace.The lock with the dimension of 100m13.5m2.5m (L
9、WMin.water depth) is located on the left side of the spillway.Shaxikou Hydropower Station has the comprehensive benefits of generating electricity,shipping transportation， navigation afloating woods and etc. It has a very important position in the electricity network of Fujian Province.Keywords:Shax
10、ikou Hydropowerstation power house in river channel concrete gravity dam over flow dam combinatory hydro-generator stability against slidingaxial flow type turbine uplift pressure structure design of generator floor 目 录前言1第一章 水文地质情况与枢纽布置11.1 流域概况11.2 水文气象条件11.3 水库地质41.4 坝址工程地质条件及坝轴线选定41.5 建筑材料81.6 综
11、合利用81.7 枢纽布置8第二章 重力坝挡水坝段设计102.1 剖面设计102.1.1 坝顶高程102.1.2 坝顶宽度112.1.3 廊道的布置112.1.4 剖面形态112.2 坝体稳定分析和应力校核122.2.1 设计蓄水位时（一台机组满发）122.2.1.1荷载计算122.2.1.2 挡水重力坝的稳定分析132.2.1.3 应力校核142.2.2 设计洪水位时152.2.2.1 荷载计算152.2.2.2 挡水重力坝的稳定分析162.2.2.3 应力校核162.2.3 校核洪水位时172.2.3.1 荷载计算182.2.3.2 挡水重力坝的稳定分析19第三章 重力坝溢流坝段设计213.
12、1 溢流坝段空口尺寸拟定213.2 溢流坝段剖面设计213.2.1 堰顶高程223.2.2 堰面曲线223.2.3 上游曲线233.2.4 反弧段半径的确定233.3 坝体稳定分析和应力校核233.3.1 设计蓄水位时（一台机组满发）233.3.1.1荷载计算233.3.1.2 溢流坝的稳定分析243.3.1.3 应力校核253.3.2 设计洪水位时253.3.2.1 荷载计算253.3.2.2 溢流坝的稳定分析273.3.2.3 应力校核273.3.3 校核洪水位时283.3.3.1 荷载计算283.3.3.2 溢流坝的稳定分析293.3.3.3 应力校核30第四章 专题：下游消能设计324
13、.1消能方式：324.1.1 采用底流消能324.2 消力护坦设计344.2.1 护坦长度确定344.2.2 护坦厚度确定及抗浮稳定校核344.3 护坦配筋364.4下游保护段36第五章 水电站建筑物设计375.1 特征水头的选择375.2 水电站水轮机组的选型405.3 涡壳和尾水管的计算465.4 发电机的选择与尺寸估算495.4.1 水轮机发电机主要尺寸估算495.4.2 发电机外形平面尺寸估算505.4.3发电机外形轴向尺寸计算515.4.4 发电机重量估算515.4.5 水轮机重量估算525.4.6 水轮机重量估算525.5 调速器与油压装置的选择525.5.1 调速功计算525.5
14、.2 接力器的选择525.5.3 调速器的选择535.5.4 油压装置545.6 厂房桥吊设备的选择555.7 主厂房各层高程及长宽尺寸的确定565.7.1 水轮机组安装高程565.7.2 尾水管地板高程和厂房基础开挖高程575.7.3 水轮机层地面高程575.7.4发电机楼板高程和安装场高程575.7.5 吊车梁轨顶高程575.7.6 屋顶面高程575.7.7 厂房总高575.7.8 主厂房平面尺寸的设计575.9 水电站厂房的稳定计算585.9.1 正常水位运行工况585.9.2 校核洪水运行工况595.9.3 机组大修工况61参考文献6457第一章 水文地质情况与枢纽布置1.1 流域概况
15、闽江西溪为福建省最大河流上游的西支，流经福建省十四个县市，与闽江北支建溪汇合于南平市。西溪全长349公里，邵武至顺昌段河道坡降0.9%，已建安沙水电站位于沙溪中游末端，控制集水面积5184平方公里。富屯溪干流全长285公里，邵武至顺昌段河道坡降1.3%。其最大支流为金溪，全长253公里，地形更为陡峻，河道坡降高达1.5%，已建池潭水电站位于金溪中游，控制集水面积为4766平方公里。沙溪口水电站位于沙溪和富屯溪汇合口下游6公里的西溪上，控制集水面积25562平方公里制，占闽江流域总面积的42%，流域内森林茂盛，覆盖良好，有较好的水土保持条件。1.2 水文气象条件1). 水文气象情况西溪的降水量观测，解放前从1935年开始，但站点少，资料断续不全，精度较差。1952年起陆续增设雨量站，到1978年已达162处，平
