世界桥梁
世界橋樑
세계교량
WORLD BRIDGE
2015年
1期
59-64
,共6页
多塔斜拉桥%钢箱梁%合龙工艺%合龙顺序%无应力状态法%顶推施工%施工技术
多塔斜拉橋%鋼箱樑%閤龍工藝%閤龍順序%無應力狀態法%頂推施工%施工技術
다탑사랍교%강상량%합룡공예%합룡순서%무응력상태법%정추시공%시공기술
multipylon cable-stayed bridge%steel box girder%closure technique%closure se-quence%unstressed state method%pushing construction%construction technique
嘉绍大桥主航道桥为(70+200+5×428+200+70) m六塔七跨分幅式钢箱梁斜拉桥。为确保其顺利合龙,结合该桥六塔独柱(桥塔为弱柱结构)并设置竖向双排支座体系和跨中刚性铰等结构特点,按照结构运营状态达到设计理想状态为施工控制目标,采用有限元软件建立实体模型,对关键控制工况分别进行仿真分析,对其合龙工艺、合龙顺序进行研究。研究确定该桥按照无应力状态几何控制法进行顶推合龙施工的方案,7个合龙口按照边跨→中跨→次边跨→次中跨的合龙顺序进行逐次合龙,并对合龙过程中的顶推施工工艺、关键施工参数确定、主要控制手段及实施控制要点进行了阐述。实践证明,该合龙方案和合龙顺序高效、高精度地完成了该桥的顶推合龙施工。
嘉紹大橋主航道橋為(70+200+5×428+200+70) m六塔七跨分幅式鋼箱樑斜拉橋。為確保其順利閤龍,結閤該橋六塔獨柱(橋塔為弱柱結構)併設置豎嚮雙排支座體繫和跨中剛性鉸等結構特點,按照結構運營狀態達到設計理想狀態為施工控製目標,採用有限元軟件建立實體模型,對關鍵控製工況分彆進行倣真分析,對其閤龍工藝、閤龍順序進行研究。研究確定該橋按照無應力狀態幾何控製法進行頂推閤龍施工的方案,7箇閤龍口按照邊跨→中跨→次邊跨→次中跨的閤龍順序進行逐次閤龍,併對閤龍過程中的頂推施工工藝、關鍵施工參數確定、主要控製手段及實施控製要點進行瞭闡述。實踐證明,該閤龍方案和閤龍順序高效、高精度地完成瞭該橋的頂推閤龍施工。
가소대교주항도교위(70+200+5×428+200+70) m륙탑칠과분폭식강상량사랍교。위학보기순리합룡,결합해교륙탑독주(교탑위약주결구)병설치수향쌍배지좌체계화과중강성교등결구특점,안조결구운영상태체도설계이상상태위시공공제목표,채용유한원연건건립실체모형,대관건공제공황분별진행방진분석,대기합룡공예、합룡순서진행연구。연구학정해교안조무응력상태궤하공제법진행정추합룡시공적방안,7개합룡구안조변과→중과→차변과→차중과적합룡순서진행축차합룡,병대합룡과정중적정추시공공예、관건시공삼수학정、주요공제수단급실시공제요점진행료천술。실천증명,해합룡방안화합룡순서고효、고정도지완성료해교적정추합룡시공。
The main navigational channel bridge of Jiashao Bridge ,with span arrangement of (70+200+ 5 × 428+200+70) m ,is a six‐pylon seven‐span steel box girder cable‐stayed bridge with left and right separated decks .The bridge pylons are single‐columned pylons ,belonging to flexible structure .The bridge has the salient features of using double‐row bearing system and in‐stalling rigid hinges in the midspans .The construction control aim is set ,assuming that the service condition of the structure reaches the ideal designed state .The finite element software was used to establish the solid model of the bridge to do simulation analysis of the key control load cases and study the closure techniques and procedures .According to the results of the study ,the pushing construction technique based on the unstressed state geometrical control method for the bridge was determined .The seven closure gaps were closed following the sequence of side span→intermediate span→subsidiary side span→subsidiary intermediate span .And the pushing technique ,determina‐tion of the key construction parameters ,main control measures and key control points in the imple‐mentation of the measures during the closing process were elaborated .The engineering practice proves that by applying the proposed closure scheme and sequence ,the pushing closure construc‐tion of the bridge were completed with high efficiency and precision .