交通科技
交通科技
교통과기
TRANSPORTATION SCIENCE & TECHNOLOGY
2015年
2期
48-50,51
,共4页
大跨度%连续刚构%合龙%顶推%施工技术
大跨度%連續剛構%閤龍%頂推%施工技術
대과도%련속강구%합룡%정추%시공기술
long span%continuous rigid frame%closure%jacking and pushing%construction technique
合龙为桥梁由静定转换为超静定的关键工序，其措施、参数的确定对施工过程及后期运营结构安全有着较大影响。文中以82．5 m＋90 m＋220 m＋82．5 m 的北盘江大桥合龙为对象，对超大跨径桥梁多次体系转换的合龙技术进行了研究，结合桥梁后期收缩、徐变引起的墩身水平位移计算成果，以各墩弯矩平衡为原则，确定了顶推力、顶推量、合龙温度等参数，制定了合龙段配重、顶推、锁定、浇筑等合龙工序，保证了施工过程及成桥状态下的结构安全。
閤龍為橋樑由靜定轉換為超靜定的關鍵工序，其措施、參數的確定對施工過程及後期運營結構安全有著較大影響。文中以82．5 m＋90 m＋220 m＋82．5 m 的北盤江大橋閤龍為對象，對超大跨徑橋樑多次體繫轉換的閤龍技術進行瞭研究，結閤橋樑後期收縮、徐變引起的墩身水平位移計算成果，以各墩彎矩平衡為原則，確定瞭頂推力、頂推量、閤龍溫度等參數，製定瞭閤龍段配重、頂推、鎖定、澆築等閤龍工序，保證瞭施工過程及成橋狀態下的結構安全。
합룡위교량유정정전환위초정정적관건공서，기조시、삼수적학정대시공과정급후기운영결구안전유착교대영향。문중이82．5 m＋90 m＋220 m＋82．5 m 적북반강대교합룡위대상，대초대과경교량다차체계전환적합룡기술진행료연구，결합교량후기수축、서변인기적돈신수평위이계산성과，이각돈만구평형위원칙，학정료정추력、정추량、합룡온도등삼수，제정료합룡단배중、정추、쇄정、요축등합룡공서，보증료시공과정급성교상태하적결구안전。
Closure is a key construction step by which a bridge transforms from a statically determinate structure to a statically indeterminate one.The measures and parameters adopted will exert considera-ble influence on the construction process as well as the structural safety in the late service period.For this study,the Beipanjiang River Bridge with span arrangement of 82.5 m+220 m+290 m+220 m+82.5 m was taken as the study background.The closure techniques led the long-span bridge to experi-ence multiple systematic transformations were studied in depth.Combined with the calculated values of pier shaft horizontal displacement induced by the late shrinkage and creep of the bridge,a series of parameters,such as the pushing force,pushing amount and closure temperature,were rationally de-termined in the context that the bending moments in piers were in balance.And the closure steps in-cluding the closure section counterweight,jacking and pushing,closure gap locking and concreting were formulated,aiming to assure the safety of the structure during the construction process and in the completed bridge state.
