西沙黃河(he)大(da)橋(qiao)始(shi)建于1971年(nian),位于甘肅省蘭州市西固(gu)區鐘家河(he)(古浪路北(bei)端),并于2005年(nian)進(jin)行過一(yi)次改造(zao)加固(gu),現橋(qiao)長320米,寬(kuan)僅11米,雙向兩車道。
西(xi)沙(sha)黃(huang)河大(da)橋由蘭州(zhou)市(shi)市(shi)政工(gong)程(cheng)公(gong)司(si)投資興(xing)建,蘭州(zhou)市(shi)勘測(ce)設(she)計(ji)(ji)處設(she)計(ji)(ji),蘭州(zhou)市(shi)市(shi)政工(gong)程(cheng)公(gong)司(si)施工(gong)。設(she)計(ji)(ji)載等(deng)級汽(qi)-18、拖-80,地震基本烈度Ⅶ度,通航(hang)標(biao)準5級,設(she)計(ji)(ji)洪(hong)水(shui)頻率(lv)1/100,設(she)計(ji)(ji)洪(hong)水(shui)流量6500m3/s,設(she)計(ji)(ji)洪(hong)水(shui)位1539.5米。大(da)橋為(wei)魚腹式(shi)鋼桁(heng)梁和混凝(ning)土(tu)T型梁橋,橋面(mian)寬10米,其中車行(xing)道7米,人行(xing)道1.25x2m,孔跨置為(wei)5X22.16m+3x32.6m+5x22.16m。上部結構為(wei)主跨3跨魚腹式(shi)鋼桁(heng)梁,跨徑32.6m米,其余10跨為(wei)裝配式(shi)普通鋼筋混凝(ning)土(tu)T型梁,跨度為(wei)22.16米。
橋(qiao)(qiao)(qiao)(qiao)長320m,于(yu)1971年(nian)6月開(kai)工(gong)(gong)建設(she),1974年(nian)6月竣工(gong)(gong)通(tong)車(che)。大(da)橋(qiao)(qiao)(qiao)(qiao)由蘭(lan)州(zhou)市(shi)市(shi)政(zheng)(zheng)工(gong)(gong)程(cheng)公司投資興建,蘭(lan)州(zhou)市(shi)勘測設(she)計(ji)處設(she)計(ji),蘭(lan)州(zhou)市(shi)市(shi)政(zheng)(zheng)工(gong)(gong)程(cheng)公司施工(gong)(gong)。設(she)計(ji)載等級汽(qi)-18、拖-80,地震基本烈(lie)度(du)Ⅶ度(du),通(tong)航標準(zhun)5級,設(she)計(ji)洪(hong)水(shui)頻率1/100,設(she)計(ji)洪(hong)水(shui)流量6500Ⅱi3/s,設(she)計(ji)洪(hong)水(shui)位1539.5m。大(da)橋(qiao)(qiao)(qiao)(qiao)為(wei)(wei)魚(yu)腹式鋼(gang)桁梁(liang)和混凝土T型梁(liang)橋(qiao)(qiao)(qiao)(qiao),橋(qiao)(qiao)(qiao)(qiao)面寬lOm,其中車(che)行(xing)(xing)道(dao)7m,人行(xing)(xing)道(dao)1.25x2m,孔跨(kua)置為(wei)(wei)5X22.16m+3x32.6m+5x 22.16m。上(shang)部(bu)(bu)結(jie)構為(wei)(wei)主(zhu)(zhu)跨(kua)3跨(kua)魚(yu)腹式鋼(gang)桁梁(liang),跨(kua)徑32.6m,其余(yu)10跨(kua)為(wei)(wei)裝(zhuang)配式普通(tong)鋼(gang)筋混凝土T型梁(liang),跨(kua)度(du)為(wei)(wei)22.16m。下部(bu)(bu)結(jie)構為(wei)(wei)明(ming)挖(wa)基礎(chu)及沉井基礎(chu)。該大(da)橋(qiao)(qiao)(qiao)(qiao)經過30多(duo)年(nian)的(de)運營使用,橋(qiao)(qiao)(qiao)(qiao)面鋪裝(zhuang)層已本破壞,局(ju)部(bu)(bu)完全破壞,車(che)輛通(tong)過時橋(qiao)(qiao)(qiao)(qiao)面震感(gan)明(ming)顯。為(wei)(wei)此(ci),經過勘測論(lun)證(zheng)和設(she)計(ji),蘭(lan)州(zhou)市(shi)政(zheng)(zheng)府決定對其進行(xing)(xing)改造(zao)加固。大(da)橋(qiao)(qiao)(qiao)(qiao)改造(zao)加固工(gong)(gong)程(cheng)主(zhu)(zhu)要(yao)包(bao)括橋(qiao)(qiao)(qiao)(qiao)梁(liang)上(shang)部(bu)(bu)結(jie)構更換、下部(bu)(bu)結(jie)構維修(xiu)及附屬設(she)施維修(xiu)等,總(zong)投資2000多(duo)萬元。