文章(zhang)來源：中(zhong)國水利水電建設集(ji)團公司(si) 發布時間：2012-05-04
由中(zhong)國水(shui)電集團所屬(shu)水(shui)電十四局負責承建(jian)的(de)四川省“再(zai)造一個(ge)都江堰灌區”水(shui)利建(jian)設重點工(gong)程——向家(jia)壩灌區引水(shui)隧洞工(gong)程開工(gong)儀式在(zai)向家(jia)壩水(shui)電站舉(ju)行(xing)。
向(xiang)家(jia)壩(ba)灌(guan)(guan)(guan)(guan)區(qu)工(gong)(gong)程(cheng)(cheng)是四(si)川省(sheng)規模僅次于都江(jiang)堰灌(guan)(guan)(guan)(guan)區(qu)的(de)大型骨干水利工(gong)(gong)程(cheng)(cheng)，向(xiang)家(jia)壩(ba)灌(guan)(guan)(guan)(guan)區(qu)引(yin)水隧洞是整(zheng)個灌(guan)(guan)(guan)(guan)區(qu)工(gong)(gong)程(cheng)(cheng)建(jian)設(she)的(de)咽喉工(gong)(gong)程(cheng)(cheng)，由取輸水及(ji)(ji)灌(guan)(guan)(guan)(guan)溉渠(qu)系(xi)、囤(dun)蓄水庫、提(ti)水工(gong)(gong)程(cheng)(cheng)及(ji)(ji)田間(jian)工(gong)(gong)程(cheng)(cheng)四(si)大部(bu)分組(zu)成。灌(guan)(guan)(guan)(guan)區(qu)開發任(ren)務(wu)以(yi)灌(guan)(guan)(guan)(guan)溉為主(zhu)，兼顧城(cheng)(cheng)(cheng)鄉(xiang)生活、工(gong)(gong)業供(gong)水。灌(guan)(guan)(guan)(guan)區(qu)工(gong)(gong)程(cheng)(cheng)涉及(ji)(ji)四(si)川省(sheng)宜賓、瀘州、自貢、內江(jiang)4市21個縣（區(qu)）和(he)云南省(sheng)昭通市水富縣，規劃設(she)計(ji)灌(guan)(guan)(guan)(guan)溉面積(ji)348.85萬畝，可補充解決(jue)灌(guan)(guan)(guan)(guan)區(qu)143個城(cheng)(cheng)(cheng)鎮(zhen)（其(qi)中(zhong)8座縣城(cheng)(cheng)(cheng)）和(he)50.94萬人農村人口(kou)用水問題，并向(xiang)自貢、內江(jiang)市區(qu)和(he)隆昌(chang)縣城(cheng)(cheng)(cheng)供(gong)水。向(xiang)家(jia)壩(ba)灌(guan)(guan)(guan)(guan)區(qu)取水樞(shu)(shu)紐分南北兩條(tiao)(tiao)總干渠(qu)，總干渠(qu)取水口(kou)和(he)取水隧洞分別(bie)位(wei)于向(xiang)家(jia)壩(ba)水電站(zhan)樞(shu)(shu)紐兩岸，兩條(tiao)(tiao)隧洞全長15公里(li)。
向(xiang)家壩水(shui)(shui)(shui)電站灌區北總干渠取(qu)水(shui)(shui)(shui)口及取(qu)水(shui)(shui)(shui)隧(sui)洞位于(yu)向(xiang)家壩水(shui)(shui)(shui)電站樞紐(niu)左(zuo)(zuo)岸，其(qi)取(qu)水(shui)(shui)(shui)口與左(zuo)(zuo)14號非溢流壩段結合，取(qu)水(shui)(shui)(shui)口閘室底板高程357.00米(mi)(mi)，孔(kong)口寬8.2米(mi)(mi)，高8.2米(mi)(mi)，取(qu)水(shui)(shui)(shui)口后為(wei)圓形有(you)壓隧(sui)洞，洞身(shen)開挖為(wei)馬蹄型斷(duan)面，采用鋼筋混凝土(tu)全斷(duan)面襯(chen)砌(qi)，直徑8.2米(mi)(mi)，長度(du)為(wei)439米(mi)(mi)。其(qi)施工支(zhi)洞開挖斷(duan)面為(wei)城門(men)洞型，開挖斷(duan)面為(wei)7米(mi)(mi)×6.5米(mi)(mi)（寬×高），長度(du)為(wei)567米(mi)(mi)，工期為(wei)24個月。