免费菠萝视频app下载

11月7日下午，由中(zhong)國鐵建(jian)(jian)所屬中(zhong)鐵十一局承(cheng)建(jian)(jian)的國家重點(dian)鐵路項目，成(cheng)(都)昆(明(ming))鐵路擴能(neng)改造工程永(yong)(仁)廣(通)段龍川江三線大橋順利轉體(ti)。這不僅開(kai)創(chuang)了(le)世界(jie)橋梁(liang)建(jian)(jian)設史上(shang)橋梁(liang)墩中(zhong)轉體(ti)的先河，同時還(huan)填(tian)補(bu)了(le)國內外(wai)橋梁(liang)施(shi)工領(ling)域的多項技(ji)術(shu)空白，為今后同類橋梁(liang)施(shi)工積累了(le)寶貴(gui)經驗。

龍(long)川江三線(xian)大橋(qiao)(qiao)位于(yu)云(yun)南省楚雄州境(jing)內，全長460.8米，為三跨連續梁(liang)懸灌轉體橋(qiao)(qiao)，其主跨88米。該工(gong)程(cheng)是成(cheng)昆鐵路擴(kuo)(kuo)能改(gai)造工(gong)程(cheng)永(yong)廣(guang)段的(de)(de)一項控制性工(gong)程(cheng)。該項施工(gong)不僅創(chuang)下了世界鐵路橋(qiao)(qiao)梁(liang)墩中轉體高度41.4米、單體重量7350噸(dun)的(de)(de)施工(gong)紀錄，同時也創(chuang)造了世界高墩車站三線(xian)梁(liang)體的(de)(de)鐵路橋(qiao)(qiao)梁(liang)施工(gong)紀錄。它的(de)(de)順利轉體，為成(cheng)昆鐵路擴(kuo)(kuo)能改(gai)造工(gong)程(cheng)永(yong)廣(guang)段按期開通，創(chuang)造了有利條件。

成昆線上的客車從龍川江三線大橋下穿越而過

據悉，該(gai)(gai)橋原設計為懸灌施工(gong)(gong)工(gong)(gong)法(fa)(fa)，但鑒(jian)于該(gai)(gai)橋上跨既有成(cheng)昆鐵路，每天(tian)通(tong)行客貨列車幾十列，稍有差池就可能釀成(cheng)巨大安全(quan)(quan)行車事(shi)故。為確(que)保(bao)“安全(quan)(quan)零(ling)事(shi)故質量零(ling)缺陷”目標的(de)實現，中鐵十一(yi)局進行集體技(ji)術攻(gong)關(guan)，大膽提(ti)出了(le)懸灌工(gong)(gong)藝加(jia)轉(zhuan)體工(gong)(gong)法(fa)(fa)的(de)施工(gong)(gong)方案(an)(an)，后經設計院的(de)進一(yi)步優化設計后，該(gai)(gai)方案(an)(an)在轉(zhuan)體過程(cheng)中顯示出了(le)科學可行、安全(quan)(quan)可靠的(de)顯著特點。

龍川江三線大橋俯瞰效果圖

該(gai)項目指揮長、中(zhong)鐵(tie)十一局五公司副總(zong)經(jing)(jing)理(li)劉祖彬表示：“2015年3月‘龍(long)川江三線大(da)橋(qiao)(qiao)’開工(gong)(gong)(gong)之(zhi)初，我(wo)們(men)(men)(men)(men)就(jiu)一直思考如(ru)何安(an)(an)全、快速(su)、優質的(de)(de)(de)完成(cheng)該(gai)橋(qiao)(qiao)的(de)(de)(de)施(shi)工(gong)(gong)(gong)任務(wu)，如(ru)果當(dang)時僅(jin)按照原(yuan)設計(ji)懸灌施(shi)工(gong)(gong)(gong)工(gong)(gong)(gong)藝進行(xing)施(shi)工(gong)(gong)(gong)，我(wo)們(men)(men)(men)(men)將(jiang)不僅(jin)面臨著巨(ju)大(da)的(de)(de)(de)跨既有線安(an)(an)全施(shi)工(gong)(gong)(gong)風險，同(tong)時我(wo)們(men)(men)(men)(men)還(huan)面臨巨(ju)大(da)的(de)(de)(de)工(gong)(gong)(gong)期壓力(li)。另外，按照常(chang)規(gui)同(tong)類型橋(qiao)(qiao)梁的(de)(de)(de)方法，我(wo)們(men)(men)(men)(men)選擇墩(dun)(dun)底(di)或(huo)者(zhe)墩(dun)(dun)頂(ding)(ding)轉(zhuan)體(ti)(ti)施(shi)工(gong)(gong)(gong)，那么墩(dun)(dun)底(di)轉(zhuan)體(ti)(ti)又(you)面臨著因重量過(guo)大(da)、重心過(guo)高，極易造(zao)轉(zhuan)體(ti)(ti)傾覆(fu)的(de)(de)(de)安(an)(an)全風險，或(huo)者(zhe)徹底(di)顛(dian)覆(fu)該(gai)橋(qiao)(qiao)不適(shi)宜墩(dun)(dun)底(di)轉(zhuan)體(ti)(ti)的(de)(de)(de)橋(qiao)(qiao)梁原(yuan)始結構設計(ji)，付(fu)出巨(ju)大(da)經(jing)(jing)濟(ji)成(cheng)本(ben)。而如(ru)果我(wo)們(men)(men)(men)(men)采取(qu)墩(dun)(dun)頂(ding)(ding)轉(zhuan)體(ti)(ti)，我(wo)們(men)(men)(men)(men)又(you)面臨著墩(dun)(dun)頂(ding)(ding)轉(zhuan)體(ti)(ti)構件和墩(dun)(dun)頂(ding)(ding)支(zhi)座安(an)(an)裝(zhuang)施(shi)工(gong)(gong)(gong)相(xiang)互干(gan)擾(rao)大(da)，結構復(fu)雜，工(gong)(gong)(gong)藝控(kong)制難(nan)的(de)(de)(de)問(wen)題。經(jing)(jing)反復(fu)方案(an)比選，我(wo)們(men)(men)(men)(men)最(zui)(zui)終選擇了(le)最(zui)(zui)為安(an)(an)全、最(zui)(zui)為科學，也最(zui)(zui)為經(jing)(jing)濟(ji)合(he)理(li)的(de)(de)(de)墩(dun)(dun)中(zhong)轉(zhuan)體(ti)(ti)方案(an)。”

由中鐵十一局承建的國內首座墩中轉體橋永廣鐵路項目龍川江三線大橋完成華麗轉身

成昆鐵路(lu)(lu)擴能(neng)(neng)(neng)(neng)改造工程是(shi)《西(xi)(xi)部(bu)(bu)大開(kai)發十三(san)五規劃》中云(yun)南三(san)個鐵路(lu)(lu)建設(she)項目之(zhi)一，為我(wo)國西(xi)(xi)南與(yu)西(xi)(xi)北地(di)(di)區的重(zhong)要大能(neng)(neng)(neng)(neng)力通(tong)道，其永（仁）廣(guang)(guang)（通(tong)）鐵路(lu)(lu)是(shi)我(wo)國西(xi)(xi)南鐵路(lu)(lu)網和成昆鐵路(lu)(lu)擴能(neng)(neng)(neng)(neng)改造工程的重(zhong)要組成部(bu)(bu)分，北接四川省攀枝(zhi)花，南接廣(guang)(guang)昆復(fu)線，全(quan)長(chang)126.7公里，橋隧(sui)占線路(lu)(lu)總長(chang)83.0%，設(she)計為Ⅰ級雙線電(dian)氣化鐵路(lu)(lu)，開(kai)行旅客(ke)(ke)列車(che)速度目標值為每(mei)小(xiao)時(shi)(shi)160公里。待2019年成昆鐵路(lu)(lu)擴能(neng)(neng)(neng)(neng)改造工程全(quan)線貫通(tong)后，通(tong)過這條客(ke)(ke)貨(huo)共用的大能(neng)(neng)(neng)(neng)力通(tong)道，從昆明到(dao)成都(dou)僅需7小(xiao)時(shi)(shi)，攀枝(zhi)花2小(xiao)時(shi)(shi)即可到(dao)達(da)。大幅(fu)提升的客(ke)(ke)貨(huo)運輸(shu)能(neng)(neng)(neng)(neng)力，對促進(jin)我(wo)國西(xi)(xi)南地(di)(di)區與(yu)西(xi)(xi)北地(di)(di)區、西(xi)(xi)部(bu)(bu)地(di)(di)區與(yu)南亞東南亞各國的互(hu)聯(lian)互(hu)通(tong)具有重(zhong)要意義。