文章來源：上海國資(zi)委 發布時間：2015-05-05
由上海建(jian)工(gong)一建(jian)集團(tuan)承(cheng)擔的昆山中(zhong)環北線(xian)快速化(hua)改造項目金雞(ji)河輔道橋左側拱(gong)橋鋼(gang)拱(gong)肋吊裝(zhuang)近全面完成，創出了拱(gong)橋90米跨徑鋼(gang)拱(gong)肋吊裝(zhuang)的“上海記錄(lu)”。
昆山中(zhong)環北線快速化改造(zao)項目金雞(ji)河輔道(dao)橋(qiao)由左(zuo)、右雙幅組成，主橋(qiao)結(jie)構(gou)采(cai)(cai)用(yong)鋼管混(hun)凝(ning)土系桿拱(gong)(gong)，其中(zhong)左(zuo)右幅的(de)(de)(de)鋼管拱(gong)(gong)橋(qiao)主跨計算跨徑均為90米，橋(qiao)寬18.5米，主拱(gong)(gong)是由直徑Φ900米的(de)(de)(de)雙管焊(han)接而成的(de)(de)(de)啞鈴拱(gong)(gong)，斷面高(gao)2.2米，矢高(gao)18米。根據(ju)鋼管拱(gong)(gong)肋(lei)二次拋物線啞鈴式(shi)拱(gong)(gong)型(xing)的(de)(de)(de)結(jie)構(gou)設計特點，結(jie)合(he)運輸及(ji)吊(diao)(diao)裝架(jia)設的(de)(de)(de)條件，將主拱(gong)(gong)肋(lei)每根拱(gong)(gong)肋(lei)分(fen)為7個節段(duan)，其中(zhong)2個節段(duan)為預(yu)埋(mai)節段(duan)，采(cai)(cai)用(yong)先單根單節拱(gong)(gong)肋(lei)組裝、焊(han)接，然后(hou)5節拱(gong)(gong)肋(lei)連續匹配預(yu)拼裝。整個吊(diao)(diao)裝過(guo)程中(zhong)，工程技術人員采(cai)(cai)用(yong)兩臺全站儀控制拱(gong)(gong)軸線，控制就位的(de)(de)(de)精(jing)度，并(bing)在下拱(gong)(gong)圈下部設置千斤頂，微調(diao)拱(gong)(gong)肋(lei)標高(gao)。