文章來源(yuan)：上海國資委 發布時間：2015-05-05
由上海(hai)建(jian)(jian)工(gong)一建(jian)(jian)集(ji)團承(cheng)擔(dan)的(de)昆山中環(huan)北線快速化改造項目金雞河輔道橋左側拱(gong)橋鋼拱(gong)肋(lei)吊裝近(jin)全(quan)面(mian)完成，創(chuang)出了拱(gong)橋90米跨(kua)徑鋼拱(gong)肋(lei)吊裝的(de)“上海(hai)記錄(lu)”。
昆山(shan)中(zhong)環北線(xian)快速化(hua)改造項目(mu)金雞河(he)輔道橋(qiao)由左、右雙(shuang)幅組成，主橋(qiao)結構(gou)采用鋼管(guan)混凝土(tu)系桿拱(gong)(gong)(gong)(gong)，其中(zhong)左右幅的(de)(de)鋼管(guan)拱(gong)(gong)(gong)(gong)橋(qiao)主跨計(ji)算跨徑(jing)均(jun)為90米(mi)(mi)，橋(qiao)寬18.5米(mi)(mi)，主拱(gong)(gong)(gong)(gong)是由直(zhi)徑(jing)Φ900米(mi)(mi)的(de)(de)雙(shuang)管(guan)焊接而(er)成的(de)(de)啞鈴拱(gong)(gong)(gong)(gong)，斷(duan)面(mian)高2.2米(mi)(mi)，矢高18米(mi)(mi)。根(gen)據鋼管(guan)拱(gong)(gong)(gong)(gong)肋(lei)二次拋物線(xian)啞鈴式拱(gong)(gong)(gong)(gong)型的(de)(de)結構(gou)設(she)計(ji)特點，結合運輸及吊(diao)裝(zhuang)架設(she)的(de)(de)條件，將主拱(gong)(gong)(gong)(gong)肋(lei)每根(gen)拱(gong)(gong)(gong)(gong)肋(lei)分為7個(ge)(ge)節段，其中(zhong)2個(ge)(ge)節段為預(yu)埋節段，采用先(xian)單根(gen)單節拱(gong)(gong)(gong)(gong)肋(lei)組裝(zhuang)、焊接，然后5節拱(gong)(gong)(gong)(gong)肋(lei)連續匹配預(yu)拼裝(zhuang)。整個(ge)(ge)吊(diao)裝(zhuang)過程中(zhong)，工(gong)程技(ji)術(shu)人員(yuan)采用兩臺全站儀控(kong)(kong)制拱(gong)(gong)(gong)(gong)軸線(xian)，控(kong)(kong)制就位的(de)(de)精度(du)，并在下(xia)(xia)拱(gong)(gong)(gong)(gong)圈下(xia)(xia)部設(she)置千斤頂，微調拱(gong)(gong)(gong)(gong)肋(lei)標高。