免费菠萝视频app下载

　　由(you)中國水電集(ji)團所屬水電十四局負責承建的四川省“再造一個(ge)都江堰灌(guan)區”水利建設重點工(gong)程——向家壩(ba)灌(guan)區引水隧(sui)洞工(gong)程開(kai)工(gong)儀式在向家壩(ba)水電站舉(ju)行(xing)。

　　向(xiang)家(jia)壩灌(guan)區(qu)(qu)(qu)工(gong)(gong)程(cheng)(cheng)(cheng)是(shi)四(si)川(chuan)省(sheng)規模僅次于都江堰灌(guan)區(qu)(qu)(qu)的大型骨干水(shui)(shui)利工(gong)(gong)程(cheng)(cheng)(cheng)，向(xiang)家(jia)壩灌(guan)區(qu)(qu)(qu)引水(shui)(shui)隧(sui)洞是(shi)整(zheng)個(ge)灌(guan)區(qu)(qu)(qu)工(gong)(gong)程(cheng)(cheng)(cheng)建(jian)設的咽喉工(gong)(gong)程(cheng)(cheng)(cheng)，由取(qu)輸水(shui)(shui)及(ji)(ji)灌(guan)溉渠系、囤蓄水(shui)(shui)庫、提水(shui)(shui)工(gong)(gong)程(cheng)(cheng)(cheng)及(ji)(ji)田間(jian)工(gong)(gong)程(cheng)(cheng)(cheng)四(si)大部分組成。灌(guan)區(qu)(qu)(qu)開發任務(wu)以灌(guan)溉為主，兼顧城(cheng)(cheng)鄉生活(huo)、工(gong)(gong)業供水(shui)(shui)。灌(guan)區(qu)(qu)(qu)工(gong)(gong)程(cheng)(cheng)(cheng)涉及(ji)(ji)四(si)川(chuan)省(sheng)宜(yi)賓、瀘州、自貢、內(nei)江4市21個(ge)縣（區(qu)(qu)(qu)）和云南省(sheng)昭(zhao)通市水(shui)(shui)富縣，規劃設計灌(guan)溉面(mian)積348.85萬畝，可補充解決灌(guan)區(qu)(qu)(qu)143個(ge)城(cheng)(cheng)鎮（其中8座(zuo)縣城(cheng)(cheng)）和50.94萬人農村人口用水(shui)(shui)問題，并向(xiang)自貢、內(nei)江市區(qu)(qu)(qu)和隆昌縣城(cheng)(cheng)供水(shui)(shui)。向(xiang)家(jia)壩灌(guan)區(qu)(qu)(qu)取(qu)水(shui)(shui)樞紐(niu)分南北兩(liang)(liang)(liang)條(tiao)總(zong)(zong)干渠，總(zong)(zong)干渠取(qu)水(shui)(shui)口和取(qu)水(shui)(shui)隧(sui)洞分別位于向(xiang)家(jia)壩水(shui)(shui)電站(zhan)樞紐(niu)兩(liang)(liang)(liang)岸，兩(liang)(liang)(liang)條(tiao)隧(sui)洞全長15公(gong)里。

　　向家壩水(shui)電站灌區北總干(gan)渠(qu)取(qu)水(shui)口(kou)及取(qu)水(shui)隧(sui)洞(dong)位(wei)于向家壩水(shui)電站樞紐左(zuo)(zuo)岸，其(qi)取(qu)水(shui)口(kou)與左(zuo)(zuo)14號非(fei)溢流壩段結(jie)合，取(qu)水(shui)口(kou)閘室底板高(gao)程(cheng)357.00米(mi)(mi)，孔口(kou)寬(kuan)8.2米(mi)(mi)，高(gao)8.2米(mi)(mi)，取(qu)水(shui)口(kou)后為(wei)圓形有壓隧(sui)洞(dong)，洞(dong)身開挖(wa)為(wei)馬蹄型(xing)斷(duan)面(mian)，采用鋼(gang)筋混凝土(tu)全斷(duan)面(mian)襯砌(qi)，直徑8.2米(mi)(mi)，長(chang)度為(wei)439米(mi)(mi)。其(qi)施(shi)工支洞(dong)開挖(wa)斷(duan)面(mian)為(wei)城門洞(dong)型(xing)，開挖(wa)斷(duan)面(mian)為(wei)7米(mi)(mi)×6.5米(mi)(mi)（寬(kuan)×高(gao)），長(chang)度為(wei)567米(mi)(mi)，工期為(wei)24個月。