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    “科技之花”綻放玉磨鐵路第一長隧

    時間:2019-06-11 14:41:41 來源:人民鐵道網 作者:謝永彬 譚文峰
      人民鐵道網訊 (通訊員謝永彬 譚文峰) “中老鐵路看玉磨,玉磨鐵路看安定。”
     
      玉磨鐵路是中老國際鐵路大通道的國內段,沿線山高谷深,橋隧相連,橋隧長度占線路設計總長的87.1%,因施工難度極大,建設推進比中老鐵路國外段相對滯后,工期十分緊迫。
      
      全長17.476公里的安定隧道,下穿哀牢山,是玉磨鐵路第一隧,全線頭號重點控制性工程,I級高風險隧道,共穿越20條斷層,集軟弱圍巖、涌水、高地應力于一體,號稱地質博物館,施工難度極大,工期壓力緊,為全線關注的焦點。
      
      6月7日,筆者來到位于太陽城元江境內的安定隧道進口工地采訪。中鐵五局玉磨鐵路項目部黨工委書記劉魁介紹說:“花開玉磨風景美,“科技之花”結碩果。”
      
      中鐵五局承擔安定隧道進口8.8公里的施工任務,要渡過11條斷層和1個向斜。為實現長隧短打,分進口及平導、1號斜井、2號斜井三個工區進行施工。面對復雜的地質,2018年3月以來,項目部高舉“科技利劍”,積極開展軟弱圍巖快速施工科研課題研究,經過技術人員和參建工人不斷總結實踐,采用三臺階帶仰供一次開挖成形的先進工法,實現了由慢到快的大逆轉。
      
      針對前期施工中仰拱“拖后腿”跟不上,隧道變形大的問題,項目部經過反復實驗,采用兩(三)臺階法的施工工法,選對了臺階的長度、高度、循環進尺,確保了掌子面空間平行利用,仰供封閉同步跟進,上(中)下臺階工作量相匹配,符合人員適應性、設備匹配性,提高了圍巖穩定性。有了合理的臺階高度及長度,工人施工更方便,設備使用效率更高,多個工作面“并駕齊驅”同步推進,取得了“一舉多得”的成效。
      
      針對前期工序銜接不緊湊,前面干,后面停,干干停停,效率不高的問題,項目部經過方案研究和實踐,捋順了工序,采取上下臺階及仰拱一次開挖成型,下臺階出碴和上臺階立架同時作業,上臺階噴漿和下臺階及仰拱立架同時施工,實行了“零耽擱、負交接”,通過實現平行作業和做好工序銜接,實現了以空間換時間,掘進施工從原來一天最多一茬炮,到后來一天可以兩茬炮,工效提升“立竿見影”。
      
      與此同時,項目部配齊配強資源,保證施工人員充足、設備備份、混凝土保證連續供應;采取超前地質預報,為開挖“探好路”,監控量測全天候,仰拱成環緊跟進,確保安全無憂、質量可控;加強考核激勵,工序循環越快、獎勵越多、立馬兌現,誰誤事、誰負責,獎罰并舉,決不手軟;營造大干氛圍,開展勞動競賽,每月評比先進班組和個人,召開表彰大會,給先進個人佩戴大紅花,頒發獎金。
      
      一系列的“組合拳”下來,安定隧道施工進度大幅提升,斜井進度由原來50-80米提升到110-130米,最快月進度達到了150米以上,正洞的由原來不足50米提升到70-80米,實現了工期的基本可控。
      
      經過一年多的科技攻關,項目部在安定隧道軟弱圍巖快速施工中總結了出的“正工法、順工序、配資源、抓安全、強考核、重宣傳”六招秘笈得到了中國鐵路總公司領導的認可和充分肯定。
      
      5月10日,中國鐵路總公司組織了9家鐵路局、17家鐵路公司,以及玉磨、大臨等鐵路線施工單位150人到安定隧道進口,舉行軟弱圍巖隧道快速施工管理現場觀摩會。6月7日,中國鐵路總公司黨組書記、總經理陸東福到安定隧道進口調研。
      
      目前,中鐵五局負責的安定隧道進口管段正洞為IV圍巖,可以實現兩天三茬炮,每個循環開挖進尺2.4米,平均每天進尺3.6米。截至6月2日,完成正洞施工1.9公里,輔助坑道8.9公里,目前項目部全體參建者斗志昂揚,掀起了決戰決勝的大干高潮,力爭在1年之內完成余下近7公里的正洞施工任務,確保實現明年5月全隧貫通的工期目標。
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    2、凡本網注明 “來源:XXX(非人民鐵道網)” 的作品,均轉載自其它媒體,轉載目的在于傳遞更多信息,并不代表本網贊同其觀點和對其真實性負責。
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    標簽:
    編輯: 魯溟濤

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