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頂管機吊裝入始發工作井

始發井內頂管作業現場

8月26日(ri)，南方(fang)電網公(gong)司(si)重點工(gong)(gong)程(cheng)(cheng)——對澳(ao)輸電第三通道220kV煙墩至(zhi)北安(an)線路工(gong)(gong)程(cheng)(cheng)傳來捷(jie)報：該工(gong)(gong)程(cheng)(cheng)于(yu)8月5日(ri)完(wan)成2號(hao)工(gong)(gong)作井施(shi)工(gong)(gong)， 并于(yu)26日(ri)開始馬騮(liu)洲段(duan)隧道頂管施(shi)工(gong)(gong)，這比原計(ji)劃提前25天，標(biao)志著該工(gong)(gong)程(cheng)(cheng)完(wan)成又一個關鍵里程(cheng)(cheng)碑，為項目2019年6月份投產(chan)打下(xia)了堅實基礎。

據悉，該項(xiang)目(mu)建成(cheng)投產后(hou)將提升對澳(ao)輸電的可靠性和安全性，為澳(ao)門同胞分享清潔優質電力、促進粵港澳(ao)大灣區建設提供保障。

據南(nan)方電網(wang)國際公司相關(guan)負(fu)責人介紹，馬(ma)騮洲隧(sui)(sui)道(dao)頂管施(shi)工(gong)難度(du)大、周期長，按計劃頂進對(dui)于確保整個工(gong)期具有(you)重(zhong)要意(yi)義。該(gai)段(duan)隧(sui)(sui)道(dao)凈(jing)長達到1012米，施(shi)工(gong)周期約160個工(gong)日。

馬騮洲水道(dao)(dao)(dao)為(wei)國(guo)家一(yi)級航道(dao)(dao)(dao)，兩(liang)岸是高標準國(guo)防巡邏通道(dao)(dao)(dao)及濱(bin)海景觀海堤，正在建設的(de)(de)(de)對澳第四供水管道(dao)(dao)(dao)、十字門公路隧道(dao)(dao)(dao)、廣(guang)珠城際輕(qing)軌隧道(dao)(dao)(dao)等多條(tiao)穿越水道(dao)(dao)(dao)工(gong)程更(geng)進(jin)一(yi)步增加了(le)(le)本工(gong)程的(de)(de)(de)穿越實施難度。為(wei)此，項目(mu)經(jing)過多次(ci)研(yan)討論證后采(cai)用(yong)了(le)(le)地(di)(di)下連續(xu)墻工(gong)井(jing)加長距離大管徑頂管隧道(dao)(dao)(dao)的(de)(de)(de)方案。考慮到工(gong)井(jing)所處的(de)(de)(de)淤(yu)泥帶地(di)(di)質(zhi)承(cheng)載(zai)力較差、開挖深度大（達(da)到29米），設計采(cai)用(yong)了(le)(le)地(di)(di)下連續(xu)墻及8道(dao)(dao)(dao)支撐的(de)(de)(de)方案，保證工(gong)井(jing)整體結(jie)構的(de)(de)(de)穩定性。隧道(dao)(dao)(dao)頂進(jin)采(cai)用(yong)了(le)(le)內徑2.2米的(de)(de)(de)破巖(yan)泥水平(ping)衡式(shi)頂管機，確保能夠應對黏土、淤(yu)泥、巖(yan)石等多種地(di)(di)質(zhi)條(tiao)件。

目(mu)前，隧道始發工(gong)(gong)(gong)井施(shi)工(gong)(gong)(gong)完畢，隧道頂管作業開工(gong)(gong)(gong)標志著工(gong)(gong)(gong)程(cheng)建(jian)(jian)設進(jin)(jin)入(ru)(ru)新的(de)階(jie)段。記者了解(jie)到，項(xiang)目(mu)自今年2月28日開工(gong)(gong)(gong)以來(lai)，建(jian)(jian)設團(tuan)隊克服工(gong)(gong)(gong)程(cheng)地質(zhi)條件復雜、場地協調困(kun)難(nan)以及臺(tai)風汛期等(deng)困(kun)難(nan)，積極(ji)協調各參建(jian)(jian)單(dan)位確保資源投入(ru)(ru)，安全(quan)、優質(zhi)、高效推進(jin)(jin)工(gong)(gong)(gong)程(cheng)建(jian)(jian)設。截至8月中旬，項(xiang)目(mu)總體(ti)形象進(jin)(jin)度完成約40%，安全(quan)、質(zhi)量、進(jin)(jin)度均處(chu)于受控(kong)狀態。

【責任編輯：姚騰】