世界桥梁
世界橋樑
세계교량
WORLD BRIDGE
2014年
3期
34-38
,共5页
斜拉桥%斜拉索%平行钢丝%牵引方式%入锚%提升门架%桥梁施工
斜拉橋%斜拉索%平行鋼絲%牽引方式%入錨%提升門架%橋樑施工
사랍교%사랍색%평행강사%견인방식%입묘%제승문가%교량시공
cable-stayed bridge%stay cable%parallel steel wire%way of dragging%dragging the cables into the anchorages%lifting portal%bridge construction
九江二桥主桥为主跨818 m 的六跨不对称双塔双索面混合梁斜拉桥，斜拉索采用平行钢丝斜拉索，钢丝直径7 mm ，抗拉强度标准值1670 MPa 。通过对卷扬机牵引、软牵引、硬牵引及软硬组合牵引等牵引施工工艺的对比分析，结合该桥的斜拉索超重超长、中边跨索力差别大等特点，确定该桥斜拉索综合运用上述牵引工艺进行牵引。根据实际施工特点，设计了塔顶提升门架、梁端入锚施工平台等斜拉索安装辅助设施，有效解决了吊装能力不足、牵引设备安装困难等难题。为提高斜拉索安装工效，短索采用钢绞线接长法施工技术，有效降低梁端压锚的牵引力，加快了短索梁端入锚速度；长索采用梁端软牵引或组合牵引入锚方式，解决了长索梁端入锚困难的难题。
九江二橋主橋為主跨818 m 的六跨不對稱雙塔雙索麵混閤樑斜拉橋，斜拉索採用平行鋼絲斜拉索，鋼絲直徑7 mm ，抗拉彊度標準值1670 MPa 。通過對捲颺機牽引、軟牽引、硬牽引及軟硬組閤牽引等牽引施工工藝的對比分析，結閤該橋的斜拉索超重超長、中邊跨索力差彆大等特點，確定該橋斜拉索綜閤運用上述牽引工藝進行牽引。根據實際施工特點，設計瞭塔頂提升門架、樑耑入錨施工平檯等斜拉索安裝輔助設施，有效解決瞭弔裝能力不足、牽引設備安裝睏難等難題。為提高斜拉索安裝工效，短索採用鋼絞線接長法施工技術，有效降低樑耑壓錨的牽引力，加快瞭短索樑耑入錨速度；長索採用樑耑軟牽引或組閤牽引入錨方式，解決瞭長索樑耑入錨睏難的難題。
구강이교주교위주과818 m 적륙과불대칭쌍탑쌍색면혼합량사랍교，사랍색채용평행강사사랍색，강사직경7 mm ，항랍강도표준치1670 MPa 。통과대권양궤견인、연견인、경견인급연경조합견인등견인시공공예적대비분석，결합해교적사랍색초중초장、중변과색력차별대등특점，학정해교사랍색종합운용상술견인공예진행견인。근거실제시공특점，설계료탑정제승문가、량단입묘시공평태등사랍색안장보조설시，유효해결료조장능력불족、견인설비안장곤난등난제。위제고사랍색안장공효，단색채용강교선접장법시공기술，유효강저량단압묘적견인력，가쾌료단색량단입묘속도；장색채용량단연견인혹조합견인입묘방식，해결료장색량단입묘곤난적난제。
The main bridge of the Second Jiujiang Changjiang River Bridge is a two-pylon six-span asymmetrical hybrid girder cable-stayed bridge with a main span of 818 m and with double ca-ble planes .The stay cables are composed of the φ7 mm parallel steel wires ,each having a nominal tensile strength of 1 670 MPa .By the comparative analysis of the dragging construction techniques of dragging carried out by hoisters ,soft dragging ,strong dragging and a combination of the two , it was determined to drag the stay cables via a combined application of the above dragging tech -niques ,taking into consideration of the facts that the stay cables are very heavy and long and the difference between the cable forces in the central span and the side spans are great .According to the actual characteristics of the construction ,the auxiliary facilities for the stay cables installation were prepared ,including lifting portal mounted on pylon tops and the platform used to drag the ca-bles into the anchorages on the girder ,by which the problems of the insufficient hoisting capacity and the difficult installation of the dragging devices were resolved .To improve the efficiency of stay cable installation ,the short cables were installed by the steel strand elongation method ,effec-tively reducing the dragging force in the pressing anchorages in the girder and accelerating the speed of the cable′s entering into the anchorages in the girder .The long cables were dragged into the anchorages by the soft dragging and combined application of the aforementioned methods ,re-solving the difficulty of dragging the long cables into the anchorages in the girder .
