A江水利枢纽—薄双曲拱坝设计说明书.doc
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1、摘 要A江水利枢纽同时兼有防洪,发电,灌溉,渔业等综合作用,水库正常蓄水位183.5m,设计洪水位184.76m,校核洪水位187.98m,汛前限制水位182m,死水位164m,尾水位103.5m。水库死库容9.3亿m3,总库容12亿m3。A江水利枢纽工程等别为一等,工程规模为大(1)型工程,主要建筑物级别为1级,次要建筑物级别为3级,临时性建筑物级别为4级。A江水利枢纽的主要组成建筑物有挡水建筑物,主副厂房,泄水建筑物,过木筏道等。挡水建筑物是一变圆心变外半径的双曲拱坝,坝顶弧长335m,最大坝高98m,坝底厚26m,坝顶宽8m。泄水建筑物由两个浅孔和两个中孔组成:浅孔位于两岸,孔口宽9.0
2、m,高8.5m,进口底高程为164m,出口底高程为154m;中孔位于水电站进水口两侧,孔口宽7.5m,高7.5m,进口底高程为135m,出口底高程为130m。在坝身泄水孔的上下游侧分别布置检修闸门和工作闸门,检修闸门采用平板门,工作闸门采用弧形闸门,在每一个工作闸门的上方有启闭机房,浅孔启闭机房高程为170m,中孔启闭机房高程为150m。泄槽支撑结构采用框架式结构。坎顶高程为118m,浅孔反弧半径为40m,中孔反弧半径为50m。泄槽直线段的坡度与孔身底部坡度一致,挑射角=14o,导墙厚度为1m, 浅孔导墙高度为7.5m,中孔导墙高度为9m。坝后式厂房装有4台5万kw的发电机组,主厂房长81m,
3、宽18m,副厂房长66m,宽10m,安装场长21m,宽18m。压力管道的直径为4.5m,进水口底高程为152.3m。发电机层高程为114.8m,尾水管底高程为90.8m,厂房进水口底高程为152.3m。为防止坝基渗漏,在坝基靠近上游侧进行帷幕灌浆,并且为了减少坝基的扬压力,在灌浆帷幕之后设置排水孔。为了防止混凝土产生裂缝,拱坝坝体设置横缝,横缝面上需设置键槽,以咬合加固,增强坝体的抗剪能力。当底宽在4050m以上的拱坝,才考虑设置纵横缝,而本设计中,拱坝坝底宽为26m,小于40m,故可不设置纵缝。关键词: A江 双曲拱坝 对冲消能 泄槽 坝后厂房Abstract Ajiang hydrocom
4、plex play parts in flood control,water power,irrigation,water conservancy related fisheries,and so on.The reservoir normal water level is 183.5m,design flood level is 184.76m,maximum flood level is 187.98m,flood control level is 182m,dead water level is 164m,and tailwater level of hydropower station
5、 is 103.5m.The dead reservoir capacity is 930,000,000m3,and the total reservoir capacity is 1,200,000,000 m3. The hydraulic engineering grade is Grade I. The hydroproject is consist of water retaining structure,power house,auxiliary room,sluice structure,raft sluice,and so on. The water retaining st
6、ructure is a double curvature arch dam.The length of the axis of crest dam is about 320m.Maximum height of the dam is 98m,the thickness of the bottom of the dam is 26m,and the width of the top of the dam is 8m. The release structure is comprised of 2 mid-level outlet and 2 short-level outlet.The wid
7、th of the mid-level outlet is 9.0m,and the height is 8.5m;the width of the short-level outlet is 7.5m,and the height is7.5m.The upstream and the downstream side of every outlet are a bulkhead gate and a operating gate which is a radial gate.There is a room where a gate hoist is put above every servi
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