世界桥梁
世界橋樑
세계교량
World Bridges
2015年
6期
16-19
,共4页
马鞍山长江公路大桥%悬索桥%先导索%飞艇%过江牵引%施工方案
馬鞍山長江公路大橋%懸索橋%先導索%飛艇%過江牽引%施工方案
마안산장강공로대교%현색교%선도색%비정%과강견인%시공방안
Maanshan Changjiang River Highway Bridge%suspension bridge%pilot rope%air-ship%river crossing,construction scheme
马鞍山长江公路大桥左汊主桥为主跨2×1080 m的三塔两跨悬索桥，主缆牵引系统采用先导索过江架设，先导索设计总长2600 m ，分2段，每段1300 m。针对桥址江面宽、悬索桥需两跨过江、跨越长江“黄金航道”、安全要求高、工期紧等因素，对先导索过江方案进行比选，确定该桥先导索采用飞艇过江牵引方案架设。采用T C08X‐2．4G型遥控氦气飞艇牵引先导索，选用φ2 mm迪尼玛绳作为一级导索，采用被动放索装置的力矩电机被动放出先导索。首先由北岸向中塔飞行过江，形成北跨初级牵引系统；然后由中塔向南岸飞行，形成南跨初级牵引系统；最后由人工和卷扬机配合完成1～5级先导索替换，完成先导索过江。飞艇牵引过程中，进行飞行控制、先导索垂度控制和安全控制，保证先导索飞艇过江顺利实施。实践表明，在长江江面不封航情况下，采用飞艇过江牵引方案可以实现先导索安全可靠过江。
馬鞍山長江公路大橋左汊主橋為主跨2×1080 m的三塔兩跨懸索橋，主纜牽引繫統採用先導索過江架設，先導索設計總長2600 m ，分2段，每段1300 m。針對橋阯江麵寬、懸索橋需兩跨過江、跨越長江“黃金航道”、安全要求高、工期緊等因素，對先導索過江方案進行比選，確定該橋先導索採用飛艇過江牽引方案架設。採用T C08X‐2．4G型遙控氦氣飛艇牽引先導索，選用φ2 mm迪尼瑪繩作為一級導索，採用被動放索裝置的力矩電機被動放齣先導索。首先由北岸嚮中塔飛行過江，形成北跨初級牽引繫統；然後由中塔嚮南岸飛行，形成南跨初級牽引繫統；最後由人工和捲颺機配閤完成1～5級先導索替換，完成先導索過江。飛艇牽引過程中，進行飛行控製、先導索垂度控製和安全控製，保證先導索飛艇過江順利實施。實踐錶明，在長江江麵不封航情況下，採用飛艇過江牽引方案可以實現先導索安全可靠過江。
마안산장강공로대교좌차주교위주과2×1080 m적삼탑량과현색교，주람견인계통채용선도색과강가설，선도색설계총장2600 m ，분2단，매단1300 m。침대교지강면관、현색교수량과과강、과월장강“황금항도”、안전요구고、공기긴등인소，대선도색과강방안진행비선，학정해교선도색채용비정과강견인방안가설。채용T C08X‐2．4G형요공양기비정견인선도색，선용φ2 mm적니마승작위일급도색，채용피동방색장치적력구전궤피동방출선도색。수선유북안향중탑비행과강，형성북과초급견인계통；연후유중탑향남안비행，형성남과초급견인계통；최후유인공화권양궤배합완성1～5급선도색체환，완성선도색과강。비정견인과정중，진행비행공제、선도색수도공제화안전공제，보증선도색비정과강순리실시。실천표명，재장강강면불봉항정황하，채용비정과강견인방안가이실현선도색안전가고과강。
The left main bridge of the Maanshan Changjiang River Highway Bridge is a three‐tower suspension bridge with two main spans each of 1 080 m. The traction system for the main cables was erected by using pilot ropes which needed threading across the river .The pilot rope had a total design length of 2 600 m ,which was divided into two sections ,each measuring 1 300 m . Given the fact that the river is wide at the bridge site ,the suspension bridge needs two main spans to cross the river ,more critically ,the suspension bridge crosses the golden navigation channel of Changjiang River ,its safety requirements are demanding and construction schedule is tight ,it is determined via scheme comparison and selection that the pilot ropes be erected by using airship to guide the ropes to cross the river .The TC08X‐2 .4G remote‐controlled helium airship was adopted to guide the pilot ropes .Theφ2 mm Dyneema rope was used as the first grade pilot rope and the pilot rope was uncoiled passively by torque motor ,a kind of passive rope uncoiling device .First , the airship flied from the north bank to cross the river and stopped at the top of the intermediate tower ,forming the preliminary traction system of the north span .Then the airship started flying from the intermediate tower top towards the south bank of the river ,forming the preliminary trac‐tion system of the south span .At last ,the operatives used winches to finish the replacement of the grade Ⅰ to grade Ⅴ pilot ropes ,completing the river‐crossing construction of the pilot ropes .Dur‐ing the airship guiding process ,the flying of the airship ,verticality of the pilot ropes and the safe‐ty of both the airship and pilot ropes were controlled ,ensuring that the river‐crossing construction of the pilot ropes be conducted smoothly .The engineering practice proves that when the river is not closed for navigation ,the scheme of using airship to guide the pilot ropes to cross the river can realize the safe and sound river‐crossing construction of the pilot ropes .
