山羊峽谷棧橋

美国加州木造栈桥

山羊峽谷棧橋(英語:Goat Canyon Trestle)是一條位於加州聖迭戈縣的木造棧橋[1],長597—750英尺(182—229公尺),是世上最大的全木造棧橋[1][8][10][11]。橋梁在1933年建成,原為聖迭戈及亞利桑那東部鐵路的一部份,此前鐵路公司嘗試建造隧道以穿越卡里索峽谷[6][7],但隧道倒塌後便改為興建橋梁。這條鐵路在1919年完工前被稱為「不可能的鐵路」[12] ,從下加利福尼亞州出發,經過聖迭戈東部抵達帝王谷。由於卡里索峽谷的溫度波動,橋梁是由木造而非鋼鐵[6]。時至今日,大部份鐵路都停用了此棧橋[13]

山羊峽谷棧橋
Goat Canyon Trestle
2016年的橋梁
座標32°43′45″N 116°11′00″W / 32.72917°N 116.18333°W / 32.72917; -116.18333
跨越山羊峽谷[1]
地點安沙波利哥沙漠州立公園[1][2]
其他名稱山羊峽谷鐵路棧橋[3]
業主聖地牙哥都會運輸系統[2][4]
保護狀況聖地牙哥歷史土木工程地標[5]
設計參數
建築材料紅杉亞木[1]
全長597[6]—750[1][7]英尺(182—229米)
高度186[2][6]—200[1][8][9]英尺(57—61米)
歷史
開工日1932年[8]
完工日1933年[6]
取代15號隧道[6]
地圖
地圖

背景

編輯

聖迭戈及亞利桑那東部鐵路在時任總統西奧多·羅斯福催促及得到愛德華·亨利·哈里曼支持下[14][15],於1907年在約翰·D·施普雷克爾斯監督下開始修建[4]。工程師們稱這條鐵路為「不可能的鐵路」,因為需要穿越科羅拉多沙漠哈昆巴山[12]。鐵路最終在1919年完工,連接聖迭戈和帝王谷,途中進入墨西哥國境[2]。在興建鐵路前,聖迭戈唯一鐵路是北面經洛杉磯的鐵路,且在19世紀末在完成[16][17]。新鐵路能連接南太平洋鐵路而非北面的艾奇遜、托皮卡和聖塔菲鐵路[18]。在鐵路開通時及棧橋興建前,這鐵路最標誌性的橋梁是坎波溪高架橋(Campo Creek Viaduct),長600英尺(180公尺)及高200英尺(61公尺)[15][19]

 
已倒塌的15號隧道北面出口

聖迭戈及亞利桑那東部鐵路經歷了不少困難,包括岩石滑坡和隧道倒塌,使鐵路不時需要關閉[2]。1932年3月15日的地震使15號隧道倒塌[9][20],至今仍可見其遺跡[10]

歷史

編輯

聖迭戈及亞利桑那鐵路由首席工程師卡爾·艾肯鮑姆(Carl Eichenlaub)設計,根據CS-33標準普通圖則設計[21]。橋梁因應15號隧道倒塌而建造[22],原本設計長度為633英尺(193公尺),高186英尺(57公尺)[23],在1932年動工興建[8][24]。橋梁部份在峽谷底部完成組裝後,然後吊升至相應位置[6]。由於峽谷有顯著的溫度波動,因此採用紅杉亞木作為橋梁材料[25],與整條鐵路鐵軌屬同一木材,如採用鋼鐵則會導致金屬疲勞[6]。為抵禦峽谷的強風,橋梁以14°彎度建成[8][26]。此外橋梁沒有任何一顆釘子[8],反而使用螺栓。棧橋最終在1933年完成,而鐵路路線亦需要重新調整[6]。為方便滅火,在16號隧道附近部署一輛罐車[27]

 
山羊峽谷棧橋北面出口

第二次世界大戰結束後,聖迭戈及亞利桑那東部鐵路受到汽車旅遊上升影響而客量下降[28],最於在1951年終止了橫跨棧橋的定期客運服務[12][15][17][29],但貨運服務仍斷斷續續地持續[15]1976年颶風凱薩琳吹襲使大橋及鐵路其它部份受損,至1981年才能完全修復[13][30]。1983年,一條隧道倒塌又使鐵路服務再度中斷[31]。1999年,胡爾·侯賽造訪棧橋及替公共廣播的紀錄片加州的金(California's Gold)拍攝一集關於此橋梁[32]。修復工程拖到2003年才展開[31],在錫達山火期間,維修人員協助加州林業部滅火[33]

卡里索峽谷鐵路在2004年修復完成後恢復通車[15]太平洋西南鐵路博物館提供一條觀光路線,從坎波出發[15]。2008年,沙漠路線,包括墨西哥北部和卡里索峽谷無限期關閉以進行維護工程,使棧橋的使用再一次終止[34]。2017年初,橋梁附近的6號隧道倒塌,路線受阻[35]。2018年1月,下加利福尼亞州鐵路評估路線的維修,希望能把它重新投入使用[36],但在2021年放棄了計劃[37]。棧橋成為了遠足的熱門地點[2][6][9][38]

附近環境

編輯

山羊峽谷位於加州聖迭戈縣[39],峽谷其中一個特色是有一個乾瀑布[40]。峽谷是結晶基底[41],至少自1970年代起,瀕危物種大角羊在棧橋附近出沒[2][42],此外同屬瀕危的貝氏鶯雀亦在附近可見[43]。2017年的沙漠綻放期間,猴花在峽谷中開花[44]

複製品

編輯

聖迭戈模型鐵路博物館曾有一個HO軌棧橋複製品[45],模型比例為1:87[46],離地面6英尺(1.8公尺)及高10英尺(3.0公尺)[47]。此模型在1941年完成,比博物館更早完工[48]。此外博物館亦有另一個以1855年勘測的路線為基礎,1:160的N軌棧橋複製品[46][49]

參考資料

編輯
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外部連結

編輯