文章來源：上海國資委(wei) 發布時間：2015-05-05
由上(shang)海建工一建集團承擔的昆山中環(huan)北線快速化(hua)改(gai)造項目金(jin)雞河輔道橋(qiao)左(zuo)側拱(gong)橋(qiao)鋼(gang)拱(gong)肋吊裝近全面(mian)完成，創(chuang)出了(le)拱(gong)橋(qiao)90米跨(kua)徑(jing)鋼(gang)拱(gong)肋吊裝的“上(shang)海記(ji)錄”。
昆山中(zhong)環北線快速化(hua)改造(zao)項目金(jin)雞河輔(fu)道橋(qiao)由左、右雙幅組(zu)成，主(zhu)(zhu)橋(qiao)結構(gou)采用(yong)鋼(gang)管(guan)混凝土系桿拱(gong)(gong)(gong)，其中(zhong)左右幅的(de)鋼(gang)管(guan)拱(gong)(gong)(gong)橋(qiao)主(zhu)(zhu)跨(kua)計算跨(kua)徑均為90米，橋(qiao)寬18.5米，主(zhu)(zhu)拱(gong)(gong)(gong)是(shi)由直徑Φ900米的(de)雙管(guan)焊接而成的(de)啞鈴(ling)拱(gong)(gong)(gong)，斷面(mian)高2.2米，矢高18米。根據鋼(gang)管(guan)拱(gong)(gong)(gong)肋(lei)二(er)次(ci)拋物線啞鈴(ling)式拱(gong)(gong)(gong)型的(de)結構(gou)設計特(te)點，結合運輸及(ji)吊(diao)裝(zhuang)(zhuang)架設的(de)條(tiao)件，將主(zhu)(zhu)拱(gong)(gong)(gong)肋(lei)每(mei)根拱(gong)(gong)(gong)肋(lei)分為7個(ge)節段，其中(zhong)2個(ge)節段為預埋節段，采用(yong)先單(dan)根單(dan)節拱(gong)(gong)(gong)肋(lei)組(zu)裝(zhuang)(zhuang)、焊接，然后5節拱(gong)(gong)(gong)肋(lei)連續匹(pi)配(pei)預拼裝(zhuang)(zhuang)。整個(ge)吊(diao)裝(zhuang)(zhuang)過程中(zhong)，工程技(ji)術人員采用(yong)兩臺全站儀控(kong)制拱(gong)(gong)(gong)軸線，控(kong)制就位的(de)精度(du)，并在下拱(gong)(gong)(gong)圈下部設置千斤頂，微調(diao)拱(gong)(gong)(gong)肋(lei)標(biao)高。