概況
納(na)子(zi)峽(xia)(xia)水(shui)(shui)電(dian)站工(gong)程(cheng)是青(qing)海(hai)(hai)省(sheng)重(zhong)點工(gong)程(cheng),位于門源(yuan)回族自治縣(xian)蘇吉灘鄉與(yu)祁(qi)連縣(xian)默勒鎮的(de)交界處(chu)。2009年9月15日(ri),青(qing)海(hai)(hai)黃(huang)(huang)河中(zhong)型水(shui)(shui)電(dian)開發公司在(zai)(zai)納(na)子(zi)峽(xia)(xia)水(shui)(shui)電(dian)站工(gong)地現場舉行隆重(zhong)的(de)開工(gong)儀(yi)(yi)式。參加開工(gong)儀(yi)(yi)式的(de)有青(qing)海(hai)(hai)省(sheng)政府、省(sheng)發改委、省(sheng)水(shui)(shui)利廳、海(hai)(hai)北州政府、祁(qi)連縣(xian)政府、門源(yuan)縣(xian)政府等(deng)有關部門和黃(huang)(huang)河上游水(shui)(shui)電(dian)公司的(de)領導和專家(jia)。應業主(zhu)邀請,該院(yuan)副院(yuan)長(chang)馬明、副總(zong)工(gong)師梁宗仁出席了(le)開工(gong)儀(yi)(yi)式。該項目的(de)開工(gong)建設,標(biao)志者該院(yuan)在(zai)(zai)大(da)通河流域(yu)設計的(de)最高(gao)的(de)面(mian)板堆石(shi)壩工(gong)程(cheng)的(de)正式實(shi)施,體現了(le)該院(yuan)在(zai)(zai)面(mian)板堆石(shi)壩領域(yu)的(de)設計實(shi)力。
2011年9月(yue)6日,隨(sui)著納(na)子(zi)峽水電站基坑基礎(chu)面的清理完(wan)畢,中國水電四局第一(yi)分局納(na)子(zi)峽項目部開始對主壩進行填(tian)筑實(shi)驗。
工程
工(gong)程主(zhu)要(yao)建(jian)筑(zhu)物(wu)(wu)由混凝土面板堆(dui)石壩、右岸溢(yi)洪道、左(zuo)岸放(fang)空泄洪洞(dong)、左(zuo)岸引(yin)水(shui)(shui)(shui)發(fa)電(dian)洞(dong)、發(fa)電(dian)廠(chang)房、升壓站組成。工(gong)程規模為(wei)二等大(2)型,大壩為(wei)1級建(jian)筑(zhu)物(wu)(wu),泄水(shui)(shui)(shui)建(jian)筑(zhu)物(wu)(wu)、引(yin)水(shui)(shui)(shui)發(fa)電(dian)洞(dong)及廠(chang)房均為(wei)2級筑(zhu)物(wu)(wu)。大壩、泄水(shui)(shui)(shui)、發(fa)電(dian)引(yin)水(shui)(shui)(shui)建(jian)筑(zhu)物(wu)(wu)按(an)500年一(yi)遇(yu)洪水(shui)(shui)(shui)設計(ji),5000年一(yi)遇(yu)洪水(shui)(shui)(shui)校核(he),洪峰流量(liang)分(fen)別為(wei)1810立方(fang)米(mi)/秒和2340立方(fang)米(mi)/秒;廠(chang)房按(an)100年一(yi)遇(yu)洪水(shui)(shui)(shui)設計(ji),500年一(yi)遇(yu)洪水(shui)(shui)(shui)校核(he),洪峰流量(liang)分(fen)別為(wei)1440立方(fang)米(mi)/秒和1810立方(fang)米(mi)/秒;泄水(shui)(shui)(shui)建(jian)筑(zhu)物(wu)(wu)消能防(fang)沖(chong)按(an)50年一(yi)遇(yu)設計(ji),洪峰流量(liang)為(wei)1270立方(fang)米(mi)/秒。
納子(zi)峽水(shui)(shui)電站施(shi)工(gong)采用圍(wei)堰一(yi)次(ci)斷流,導(dao)流洞過(guo)(guo)水(shui)(shui)的導(dao)流方(fang)式(shi);汛(xun)期由壩體壩體擋水(shui)(shui)、左(zuo)岸導(dao)流洞過(guo)(guo)水(shui)(shui);水(shui)(shui)庫初期蓄水(shui)(shui)后(hou)至工(gong)程竣工(gong)前,選用壩體擋水(shui)(shui)、永(yong)久泄水(shui)(shui)建筑(zhu)物過(guo)(guo)水(shui)(shui)的導(dao)流方(fang)式(shi)。
根據規范(fan)確定導流(liu)設(she)計洪(hong)(hong)水(shui)標準(zhun)(zhun)為10年(nian)一遇(yu)(yu),相應(ying)洪(hong)(hong)峰(feng)流(liu)量(liang)為877立(li)方(fang)米/秒。施工期壩體攔(lan)洪(hong)(hong)渡汛標準(zhun)(zhun)為50年(nian)一遇(yu)(yu)設(she)計,相應(ying)最(zui)大(da)洪(hong)(hong)峰(feng)流(liu)量(liang)1300立(li)方(fang)米/秒。導流(liu)泄(xie)水(shui)建(jian)筑物(wu)封堵期間及(ji)竣工前,永久(jiu)泄(xie)洪(hong)(hong)建(jian)筑物(wu)尚(shang)未具備(bei)設(she)計泄(xie)洪(hong)(hong)能力,壩體攔(lan)洪(hong)(hong)標準(zhun)(zhun)為200年(nian)一遇(yu)(yu)洪(hong)(hong)水(shui)標準(zhun)(zhun),最(zui)大(da)洪(hong)(hong)峰(feng)流(liu)量(liang)1650立(li)方(fang)米/秒。
混凝(ning)土面(mian)板(ban)(ban)(ban)堆石(shi)壩(ba)(ba)壩(ba)(ba)軸線(xian)方位為(wei)(wei)(wei)SE145°,壩(ba)(ba)頂(ding)(ding)長度為(wei)(wei)(wei)408.3米(mi)(mi),壩(ba)(ba)頂(ding)(ding)寬(kuan)(kuan)度為(wei)(wei)(wei)10.0米(mi)(mi),最大壩(ba)(ba)高(gao)121.5米(mi)(mi),上游坡(po)(po)1:1.55,下游壩(ba)(ba)坡(po)(po)1:1.5,設(she)置三層(ceng)寬(kuan)(kuan)3米(mi)(mi)的馬道,綜(zong)合坡(po)(po)比(bi)為(wei)(wei)(wei)1:1.58。壩(ba)(ba)頂(ding)(ding)設(she)有高(gao)度為(wei)(wei)(wei)3.3米(mi)(mi)的放浪墻與面(mian)板(ban)(ban)(ban)相接,壩(ba)(ba)頂(ding)(ding)高(gao)程(cheng)3204.6米(mi)(mi),防浪墻頂(ding)(ding)高(gao)程(cheng)3205.8米(mi)(mi)。面(mian)板(ban)(ban)(ban)頂(ding)(ding)端(duan)厚(hou)度0.3米(mi)(mi),底部(bu)最大厚(hou)度0.65米(mi)(mi),為(wei)(wei)(wei)不(bu)等厚(hou)面(mian)板(ban)(ban)(ban),面(mian)板(ban)(ban)(ban)間設(she)垂直縫;面(mian)板(ban)(ban)(ban)與趾(zhi)板(ban)(ban)(ban)間設(she)周邊縫;壩(ba)(ba)頂(ding)(ding)防浪墻與面(mian)板(ban)(ban)(ban)間設(she)伸(shen)縮縫。壩(ba)(ba)體從(cong)上游到下游依次分區(qu)(qu)為(wei)(wei)(wei)蓋重區(qu)(qu)、混凝(ning)土面(mian)板(ban)(ban)(ban)、墊層(ceng)區(qu)(qu)、砂(sha)礫料(liao)3B1區(qu)(qu)、保(bao)護料(liao)區(qu)(qu)、排水區(qu)(qu)、砂(sha)礫料(liao)3B2區(qu)(qu)及下游堆石(shi)區(qu)(qu)、護坡(po)(po)。壩(ba)(ba)體填(tian)筑總量532.7957萬立(li)方米(mi)(mi)。
泄(xie)洪洞(dong)(導流洞(dong))布置于(yu)左岸(an),軸(zhou)線角度為SW249°,與壩軸(zhou)線的夾角為76°;左岸(an)上(shang)游(you)設電站直立(li)式(shi)岸(an)塔進水口,進水口右端與泄(xie)洪洞(dong)進口相鄰(lin)布置;溢洪道布置于(yu)右岸(an),軸(zhou)線為SW205°。
溢(yi)洪(hong)道(dao)布置(zhi)于(yu)右(you)岸,進口(kou)(kou)堰(yan)(yan)頂(ding)高(gao)(gao)(gao)程(cheng)3194.6米(mi)(mi)(mi)(mi),閘(zha)(zha)(zha)室設(she)計3孔弧形閘(zha)(zha)(zha)門(men),孔口(kou)(kou)尺寸為(wei)8×10米(mi)(mi)(mi)(mi),泄(xie)槽(cao)寬(kuan)度12.0米(mi)(mi)(mi)(mi)。出(chu)口(kou)(kou)高(gao)(gao)(gao)程(cheng)3119.09米(mi)(mi)(mi)(mi),挑流(liu)鼻(bi)坎(kan)高(gao)(gao)(gao)程(cheng)3118.80米(mi)(mi)(mi)(mi),落(luo)差72.51米(mi)(mi)(mi)(mi),水(shui)平(ping)(ping)軸線(xian)(xian)(xian)全長(chang)450.52米(mi)(mi)(mi)(mi)。溢(yi)洪(hong)道(dao)控制(zhi)閘(zha)(zha)(zha)室位(wei)于(yu)壩軸線(xian)(xian)(xian)處,上游設(she)置(zhi)了166.3米(mi)(mi)(mi)(mi)長(chang)的引水(shui)渠,渠底(di)高(gao)(gao)(gao)程(cheng)為(wei)3191.6米(mi)(mi)(mi)(mi),閘(zha)(zha)(zha)頂(ding)高(gao)(gao)(gao)程(cheng)3204.6米(mi)(mi)(mi)(mi),溢(yi)流(liu)堰(yan)(yan)頂(ding)高(gao)(gao)(gao)程(cheng)為(wei)3194.1米(mi)(mi)(mi)(mi),泄(xie)槽(cao)段(duan)水(shui)平(ping)(ping)長(chang)215.9米(mi)(mi)(mi)(mi),縱坡分(fen)段(duan)分(fen)別(bie)為(wei)1/20和1/2,出(chu)口(kou)(kou)高(gao)(gao)(gao)程(cheng)3119.09米(mi)(mi)(mi)(mi),挑流(liu)鼻(bi)坎(kan)高(gao)(gao)(gao)程(cheng)3118.80米(mi)(mi)(mi)(mi),落(luo)差72.51米(mi)(mi)(mi)(mi),水(shui)平(ping)(ping)軸線(xian)(xian)(xian)全長(chang)450.52米(mi)(mi)(mi)(mi)。溢(yi)洪(hong)道(dao)最(zui)大泄(xie)量1066立方米(mi)(mi)(mi)(mi)/秒,最(zui)大流(liu)速為(wei)35.73米(mi)(mi)(mi)(mi)/秒。3孔溢(yi)洪(hong)道(dao)各設(she)1扇表孔工作閘(zha)(zha)(zha)門(men),采用3臺后拉式液(ye)壓啟閉機(ji)控制(zhi)3孔閘(zha)(zha)(zha)門(men)。
引水(shui)(shui)(shui)(shui)發(fa)電(dian)洞(dong)進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)布(bu)置(zhi)在(zai)左壩肩上(shang)(shang)游(you),座(zuo)落在(zai)弱風(feng)化巖體上(shang)(shang),為(wei)岸(an)塔式(shi)進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)。進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)底(di)板(ban)(ban)高(gao)(gao)程3176.0米(mi)(mi),進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)順水(shui)(shui)(shui)(shui)流方(fang)向總長(chang)21米(mi)(mi),閘(zha)(zha)室頂部(bu)高(gao)(gao)程3204.6米(mi)(mi),布(bu)置(zhi)與(yu)大(da)開(kai)挖后的(de)(de)深槽中。進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)分為(wei)攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha)段和閘(zha)(zha)門(men)段,閘(zha)(zha)室兩(liang)側及(ji)后測與(yu)巖石開(kai)挖坡(po)面之間填筑混凝土,使閘(zha)(zha)室大(da)部(bu)分鑲嵌(qian)在(zai)巖石中。引水(shui)(shui)(shui)(shui)進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)建筑物后接壓力隧洞(dong),出口(kou)(kou)(kou)與(yu)水(shui)(shui)(shui)(shui)輪機(ji)組相接。進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)設(she)1扇事故(gu)檢(jian)(jian)修閘(zha)(zha)門(men),在(zai)事故(gu)檢(jian)(jian)修閘(zha)(zha)門(men)前設(she)一孔(kong)2道(dao)主(zhu)、副(fu)(fu)攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha)攔(lan)(lan)(lan)截河水(shui)(shui)(shui)(shui)中污(wu)(wu)物,防止污(wu)(wu)物進(jin)(jin)入發(fa)電(dian)洞(dong)損(sun)壞水(shui)(shui)(shui)(shui)輪機(ji),確保電(dian)站正常(chang)發(fa)電(dian)。主(zhu)、副(fu)(fu)攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha)上(shang)(shang)的(de)(de)污(wu)(wu)物采(cai)用(yong)人工清污(wu)(wu)。主(zhu)、副(fu)(fu)攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha)、事故(gu)檢(jian)(jian)修門(men)底(di)板(ban)(ban)高(gao)(gao)程均(jun)(jun)(jun)為(wei)3176.00米(mi)(mi),墩頂高(gao)(gao)程均(jun)(jun)(jun)為(wei)3204.60米(mi)(mi)。事故(gu)檢(jian)(jian)修閘(zha)(zha)門(men)為(wei)平板(ban)(ban)滑(hua)動鋼閘(zha)(zha)門(men),孔(kong)口(kou)(kou)(kou)尺(chi)寸(寬(kuan)×高(gao)(gao)) 6 米(mi)(mi)×6 米(mi)(mi),事故(gu)檢(jian)(jian)修閘(zha)(zha)門(men)啟(qi)(qi)閉(bi)機(ji)選(xuan)(xuan)用(yong)1臺1250KN -30m固定卷揚式(shi)啟(qi)(qi)閉(bi)機(ji)操作。進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)設(she)二(er)道(dao)二(er)孔(kong)主(zhu)、副(fu)(fu)攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha),攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha)均(jun)(jun)(jun)為(wei)潛孔(kong)式(shi)滑(hua)動支承(cheng)攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha),主(zhu)、副(fu)(fu)攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha)孔(kong)口(kou)(kou)(kou)尺(chi)寸均(jun)(jun)(jun)為(wei)(寬(kuan)×高(gao)(gao))8 米(mi)(mi)×14 米(mi)(mi) ,主(zhu)、副(fu)(fu)攔(lan)(lan)(lan)污(wu)(wu)柵(zha)(zha)(zha)(zha)(zha)啟(qi)(qi)閉(bi)機(ji)均(jun)(jun)(jun)設(she)在(zai)進(jin)(jin)水(shui)(shui)(shui)(shui)口(kou)(kou)(kou)高(gao)(gao)程為(wei)3224.60米(mi)(mi)的(de)(de)啟(qi)(qi)閉(bi)機(ji)平臺上(shang)(shang),主(zhu)柵(zha)(zha)(zha)(zha)(zha)選(xuan)(xuan)用(yong)2×800KN--30m固定卷揚式(shi)啟(qi)(qi)閉(bi)機(ji),副(fu)(fu)柵(zha)(zha)(zha)(zha)(zha)選(xuan)(xuan)用(yong)2×630KN--30m固定卷揚式(shi)啟(qi)(qi)閉(bi)機(ji),啟(qi)(qi)閉(bi)機(ji)房頂部(bu)設(she)2臺50KN的(de)(de)電(dian)動葫蘆以供啟(qi)(qi)閉(bi)機(ji)檢(jian)(jian)修時使用(yong)。
引水發電隧洞首端為(wei)(wei)(wei)(wei)12.0米(mi)(mi)(mi)(mi)(mi)長的(de)(de)漸變段(duan)(duan)(duan)(duan),由(you)6.0米(mi)(mi)(mi)(mi)(mi)×6.0米(mi)(mi)(mi)(mi)(mi)的(de)(de)矩形漸變為(wei)(wei)(wei)(wei)直徑6.0米(mi)(mi)(mi)(mi)(mi)的(de)(de)圓形,隧洞軸線方向為(wei)(wei)(wei)(wei)NE54°,樁號0+021.00~0+257.57段(duan)(duan)(duan)(duan)為(wei)(wei)(wei)(wei)上平段(duan)(duan)(duan)(duan),底板高(gao)程(cheng)(cheng)以i=4%坡(po)(po)(po)降由(you)3176.00米(mi)(mi)(mi)(mi)(mi)降至(zhi)3166.54米(mi)(mi)(mi)(mi)(mi),上平段(duan)(duan)(duan)(duan)長度(du)(du)為(wei)(wei)(wei)(wei)236.57米(mi)(mi)(mi)(mi)(mi)。上平段(duan)(duan)(duan)(duan)后(hou)由(you)轉(zhuan)彎(wan)(wan)半(ban)徑R=18.0米(mi)(mi)(mi)(mi)(mi)、轉(zhuan)彎(wan)(wan)角θ=87.71°的(de)(de)上彎(wan)(wan)段(duan)(duan)(duan)(duan)轉(zhuan)入(ru)豎(shu)井段(duan)(duan)(duan)(duan),豎(shu)井段(duan)(duan)(duan)(duan)總高(gao)度(du)(du)38.77米(mi)(mi)(mi)(mi)(mi)。豎(shu)井段(duan)(duan)(duan)(duan)后(hou)緊接(jie)著進入(ru)轉(zhuan)彎(wan)(wan)半(ban)徑R=18.0米(mi)(mi)(mi)(mi)(mi)、轉(zhuan)彎(wan)(wan)角θ=87.71°的(de)(de)下(xia)彎(wan)(wan)段(duan)(duan)(duan)(duan),最后(hou)為(wei)(wei)(wei)(wei)下(xia)平段(duan)(duan)(duan)(duan)。下(xia)平段(duan)(duan)(duan)(duan)樁號0+292.13~0+442.15,底板高(gao)程(cheng)(cheng)以i=4%坡(po)(po)(po)降由(you)3091.79米(mi)(mi)(mi)(mi)(mi)降至(zhi)3088.79米(mi)(mi)(mi)(mi)(mi),下(xia)平段(duan)(duan)(duan)(duan)長度(du)(du)為(wei)(wei)(wei)(wei)150.02米(mi)(mi)(mi)(mi)(mi)。0+442.15~0+454.15段(duan)(duan)(duan)(duan)為(wei)(wei)(wei)(wei)長度(du)(du)12米(mi)(mi)(mi)(mi)(mi)的(de)(de)漸變段(duan)(duan)(duan)(duan),底板高(gao)程(cheng)(cheng)以i=4%坡(po)(po)(po)降由(you)3088.79米(mi)(mi)(mi)(mi)(mi)降至(zhi)3188.31米(mi)(mi)(mi)(mi)(mi),其后(hou)為(wei)(wei)(wei)(wei)142.64米(mi)(mi)(mi)(mi)(mi)的(de)(de)壓力(li)鋼管埋管段(duan)(duan)(duan)(duan),樁號0+454.15~0+596.79,底板高(gao)程(cheng)(cheng)以i=4%坡(po)(po)(po)降由(you)3188.31米(mi)(mi)(mi)(mi)(mi)降至(zhi)3082.60米(mi)(mi)(mi)(mi)(mi)。0+596.79~0+621.79段(duan)(duan)(duan)(duan)為(wei)(wei)(wei)(wei)長度(du)(du)25米(mi)(mi)(mi)(mi)(mi)的(de)(de)明管段(duan)(duan)(duan)(duan)段(duan)(duan)(duan)(duan),0+621.79~0+670.04段(duan)(duan)(duan)(duan)為(wei)(wei)(wei)(wei)長度(du)(du)48.25米(mi)(mi)(mi)(mi)(mi)的(de)(de)叉管段(duan)(duan)(duan)(duan)。
引水(shui)發(fa)電洞(dong)圍巖(yan)分類及建筑物(wu)特性見表1.1.2-4。
電站
電(dian)(dian)站廠(chang)(chang)(chang)房(fang)(fang)(fang)布(bu)(bu)置(zhi)(zhi)(zhi)在(zai)壩址下游(you)約400米(mi)處左岸,廠(chang)(chang)(chang)房(fang)(fang)(fang)座落在(zai)巖石基礎上(shang)(shang),尾(wei)水(shui)渠座落在(zai)河灘(tan)砂卵礫石層(ceng)(ceng)(ceng)上(shang)(shang)。安(an)裝(zhuang)(zhuang)間緊鄰主廠(chang)(chang)(chang)房(fang)(fang)(fang)機(ji)(ji)組段左側(ce)布(bu)(bu)置(zhi)(zhi)(zhi),主廠(chang)(chang)(chang)房(fang)(fang)(fang)上(shang)(shang)游(you)側(ce)布(bu)(bu)置(zhi)(zhi)(zhi)副廠(chang)(chang)(chang)房(fang)(fang)(fang),副廠(chang)(chang)(chang)房(fang)(fang)(fang)上(shang)(shang)游(you)側(ce)布(bu)(bu)置(zhi)(zhi)(zhi)戶外式升壓站。主廠(chang)(chang)(chang)房(fang)(fang)(fang)總(zong)(zong)長37.75米(mi),安(an)裝(zhuang)(zhuang)間總(zong)(zong)長16.0米(mi)。廠(chang)(chang)(chang)房(fang)(fang)(fang)順水(shui)流向寬度19.0米(mi),總(zong)(zong)高33.9米(mi)。副廠(chang)(chang)(chang)房(fang)(fang)(fang)總(zong)(zong)長為53.8米(mi), 寬度為12.2米(mi),分為兩(liang)層(ceng)(ceng)(ceng),地面以(yi)上(shang)(shang)及以(yi)下各一(yi)層(ceng)(ceng)(ceng)。尾(wei)水(shui)平(ping)臺與發電(dian)(dian)機(ji)(ji)層(ceng)(ceng)(ceng)同高程(cheng),寬度5.7米(mi),主要布(bu)(bu)置(zhi)(zhi)(zhi)有(you)尾(wei)水(shui)門啟閉設(she)備。安(an)裝(zhuang)(zhuang)間布(bu)(bu)置(zhi)(zhi)(zhi)在(zai)主廠(chang)(chang)(chang)房(fang)(fang)(fang)左側(ce),與進場公(gong)路相接。主廠(chang)(chang)(chang)房(fang)(fang)(fang)內(nei)布(bu)(bu)置(zhi)(zhi)(zhi)有(you)3臺單機(ji)(ji)容量為29兆瓦(wa)的(de)水(shui)輪發電(dian)(dian)機(ji)(ji)組,總(zong)(zong)裝(zhuang)(zhuang)機(ji)(ji)容量為87兆瓦(wa)。布(bu)(bu)置(zhi)(zhi)(zhi)有(you)1臺125/32t -16.0m橋機(ji)(ji)。
引水發(fa)電工程由中(zhong)國水電十五局(ju)承建。