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            看 “超級工程”如何跨越天險

            • 2019年05月31日 07時45分
            • 來源: 四川日報
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            5月30日,習古高速赤水河大橋合龍,當地村民趕來看熱鬧。記者何海洋攝

            5月30日,兩大喜訊傳來:橫跨川黔兩省的古藺至習水段高速赤水河大橋合龍;成都天府國際機場T1航站樓主體結構全面封頂。兩大“超級工程”都邁出了關鍵一步。

            車行習古路,路沿山而建,山體陡峭,可以看到矗立在懸崖峭壁上的習古高速赤水河大橋,當然只是一截高塔、橋體,難顯全貌。川黔咽喉之惡、赤水天險之險,將因此橋建成而徹底改觀。5月30日,川黔大通道上的這座大橋合龍,向建成通車發起沖刺。這座有著諸多“世界第一”的峽谷大橋,如何成功橫跨赤水天險?

            跨越赤水河

            從中間向兩邊搭“積木”

            當天合龍的最后一塊鋼桁梁節段在貴州岸。早上7點,云霧繚繞,對岸四川岸僅能看見高高的塔尖。

            開始吊裝了。鋼桁梁節段前一天已組裝完成。重達202噸的龐然大物,以肉眼難發覺的速度緩慢提升。遠遠望去,艷紅色的鋼桁梁橋面橫跨在半空,僅末端還有個空缺;正在吊裝的節段如同一塊遺漏的積木,正待填充歸位。

            廖德川手持對講機下達指令。作為四川路橋集團赤水河大橋項目部常務副經理,他不僅掌握著橋梁吊裝的模擬數據,也要根據實際情況進行動態調整。

            習古高速赤水河大橋是世界第一高度、第二長跨的山區鋼桁梁懸索橋,大橋主塔高達243.5米,塔尖距水面503.5米,比東方明珠電視塔還高50米;橋面距水面近350米,相當于117層高樓,而鋼桁梁橋面的吊裝就要在這一高度完成。

            “我們采用了一種搭積木的方式。”廖德川說,在對橋型、標高進行精準模擬后,施工人員在高于橋梁的1米左右處,搭建了和橋型完全相同的貓道,架設主纜;再布設吊裝系統,將1200米主跨鋼桁梁橋面“切分”為81個節段,在大橋底部組裝后,用起吊系統吊至橋面標高處,用主纜垂下的纜繩固定。

            “積木”從中間向兩邊搭建。1月28日,1號節段吊裝至跨中位置固定后,其余節段左右各一塊分別拼接,平均2天完成一塊節段的吊裝。根據橋型,相鄰節段的纜繩長度不同,每完成一塊節段的吊裝,建設者都要走上橋去,精準測量下一個節段所需的參數。“節段之間用高強度螺栓連接,若誤差超過1毫米就無法對接,必須嚴絲合縫。”

            攻堅克難

            以隧道錨將橋“錨”住

            1200米主跨的懸索橋,放在平原地區或許不罕見,但在山區,卻極不尋常。比如,四川岸、貴州岸的項目部都位于陡峭的半山腰,山路狹窄,如何運輸建筑材料都是一個難題。為方便建設,四川岸挖出了一條近500米的隧道,作為施工便道。

            錨錠是懸索橋的重要部分。常見的錨錠是重力錨,即建一個巨大的“水泥塊”,把“主纜”拉住,可以承受橋面及運行車輛的重量。但是赤水河大橋四川岸山體近乎垂直,而且大橋建設體量大,若建重力錨可能要刨平半座山,工程量巨大,也不環保。怎么辦?

            工程師選擇了隧道錨的方式,在陡崖上45度角向下,開挖80米深的山體隧道錨洞,相當于將隧道錨做成一顆“釘子”,嵌入山體中,讓整座山成為一個錨錠。這個隧道錨洞室形狀為橢圓形,像一顆豎立的蛋,輪廓尺寸長17米、高27米,在同類工程施工中,直徑、輪廓線為世界第一。

            可視化施工,讓赤水河大橋的建設安全可控。在建設之初,大橋就進行了BIM建模,通過數字化方式,將建成后的大橋立體呈現。脫離了平面圖紙的模型,讓每一道工序、每一個關鍵部位清晰明了,是否有設計缺陷、是否相互干擾、是否存在交叉施工,管理人員心中有數。

            習古高速赤水河大橋合龍

            在二三百米高空施工,對施工人員的心理是極大考驗。為此,項目部建立了全橋視頻管理系統,共設置了30多個可360度轉動的高清攝像頭,緊盯每一步,可以看到數百米索塔上的建設情況,甚至對岸索塔上的工人都清晰可見。

            連通川南黔北

            老區交通條件將得大改善

            在習古高速赤水河大橋下游直線距離數百米處,也有一座赤水河大橋,長僅百余米,雙向車道,路陡且窄,是現在古藺、習水之間往來必經之地。

            赤水河兩岸,兩大醬香型名酒廠——郎酒廠和習酒廠遙遙相對。一進入二郎鎮或習酒鎮,就酒香撲鼻,不時有重型貨車從酒廠駛出,本就不寬的道路更加狹窄。

            江習古高速公路公司董事長鮮峻嶺告訴記者,赤水河大橋建成后,習古高速就將全線通車,兩地間的交通運輸條件將大為改善,居民出行更為便捷,以前因道路不便而運輸困難的酒廠原材料、小耳朵麻羊等特色農產品也將方便地運輸,推動沿線經濟發展。

            大橋合龍,不少村民趕來現場看熱鬧,在他們看來,高速公路的暢通,將帶來更多的人流,進一步帶動當地經濟。

            赤水河大橋本身也可能成為景點。記者了解到,已有旅游部門專家到大橋考察。設想,如果坐觀光電梯到200余米高的塔頂,俯瞰赤水河風景和喀斯特地貌,品味紅軍“四渡赤水”的紅色記憶,也未嘗不是一道新的風景。

            責任編輯: 劉怡
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