反力法在蒙华铁路汉江特大桥超大吨位挂篮预压中应用研究
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摘要
蒙华铁路汉江特大桥采用(72+116+248+116+72)m五跨部分斜拉桥跨越汉江主航道,主梁为单箱双室变高度截面,节段采用液压自动走行菱形挂篮悬灌施工。本文结合挂篮受力特点选择三角架反力预压法,模拟挂篮在最大梁段混凝土浇筑过程中的受力状态,下压底模、上拉吊带,达到预压目的。该预压技术具有投入材料少、施工方便高效、安全性高、节约施工成本的优势,为类似大吨位挂篮预压提供了经验。
Hanjiang River Bridge on Inner Mongolia-Jiangxi Railway crosses over the main channel with the( 72 + 116 +248 + 116 + 72) m of the five-span partial cable-stayed bridge. The main beam is double room for single box with variable height of section. The section adopts hydraulic automatic running diamond hanging basket for grouting construction. In this paper,according to the characteristics of the hanging basket,the tripod reaction prestressing method is adopted to simulate the stress state of the hanging basket during the process of concrete pouring at the maximum beam section. The bottom mold is pulled down and the sling is pulled up to achieve the purpose of preloading. This preloading technology has the advantages of less input materials,convenient and efficient construction,high safety and construction cost saving,which could provide an experience for similar preloading of large-tonnage hanging basket.
Hanjiang River Bridge on Inner Mongolia-Jiangxi Railway crosses over the main channel with the( 72 + 116 +248 + 116 + 72) m of the five-span partial cable-stayed bridge. The main beam is double room for single box with variable height of section. The section adopts hydraulic automatic running diamond hanging basket for grouting construction. In this paper,according to the characteristics of the hanging basket,the tripod reaction prestressing method is adopted to simulate the stress state of the hanging basket during the process of concrete pouring at the maximum beam section. The bottom mold is pulled down and the sling is pulled up to achieve the purpose of preloading. This preloading technology has the advantages of less input materials,convenient and efficient construction,high safety and construction cost saving,which could provide an experience for similar preloading of large-tonnage hanging basket.
引文
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[12]周峰,王慧东.黄龙村大桥菱形挂篮应用与研究[J].石家庄铁道学院学报(自然科学版),2008(3):40-42.
[2]钟启凯.反力架在菱形挂篮预压中的应用[J].施工技术,2012,41(S2):178-180.
[3]方银明,周登燕,陈红霞.斜拉桥38.6 m宽混凝土主梁挂篮设计及悬浇技术[J].世界桥梁,2011(6):17-21.
[4]史赟涛.连续箱梁三角形挂篮液压反力预压施工技术[J].市政技术,2015(6):54-57.
[5]冯浩,钟启凯,刘中涛,等.千斤顶贝雷反力梁在牵索挂篮预压中的应用[J].桥梁建设,2012,42(S1):121-125.
[6]张杰.汉江特大桥主墩水下大体积混凝土封底设计与施工[J].铁道建筑技术,2017(5):53-56.
[7]董立功.大吨位施工挂篮加载试验方法的探讨[J].筑路机械与施工机械化,2009,26(6):69-71.
[8]姚磊,张同晓.成兰铁路车站2号双线大桥连续梁挂篮静载试验探讨[J].建筑工程技术与设计,2016(31):1-2.
[9]赵靓,王晓敏,马永强.反力预压技术在挂篮预压中的应用[J].铁道建筑技术,2015(1):43-45.
[10]赵立财.连续梁三角形挂篮液压反力加载预压计算与分析[J].建筑机械化,2015,36(11):48-51.
[11]霍洪媛,孙永鹏,陈记豪,等.预应力混凝土连续箱梁桥悬臂施工挂篮预压试验研究[J].华北水利水电大学学报,2014(6):42-46.
[12]周峰,王慧东.黄龙村大桥菱形挂篮应用与研究[J].石家庄铁道学院学报(自然科学版),2008(3):40-42.