观石河大桥设计与施工
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摘要
湖北省麻城至武汉高速公路控制性工程——观石河大桥地处大别山脉中低山区,主桥为(67+3×120+67)m 5跨预应力混凝土连续刚构,分左、右两幅,主梁为箱形结构,主桥桥墩采用双肢变截面矩形空心薄壁墩。考虑该类型桥梁在建设和运营过程中常出现的病害,设计中箱梁高度和底板厚度均采用二次抛物线变化,以改善结构受力情况,并且采用动态、全寿命设计理念,设置一定数量的顶、底板预应力束备用孔道,在施工或运营过程中必要时启动。主梁采用三角斜拉式后支点挂篮悬浇施工,0号块采用型钢托架施工。桥梁建成后的荷载试验结果显示,桥梁承载能力满足设计要求。
Located in the middle-low mountainous area of the Dabie Mountain Range,the Guanshi River Bridge is a control project of Macheng-Wuhan Expressway in Hubei Province.The main bridge of the Bridge is a five-span prestressed concrete continuous rigid-frame bridge arranged in separated left and right bridges with span arrangement(67+33×120+67) m,the main girder is of box structure,and the piers of the bridge are designed as two-leg rectangular thin-wall hollow piers with variable sections.In view of the common problems or deterioration that may appear in the construction and operation processes of such type of bridges,the depth of the box girder and the thickness of the bottom slabs were all determined based on the variation of quadratic parabola in the design to improve the mechanical behavior of the structures.And in accordance with the dynamic and life cycle design concept,a given amount of standby ducts for the prestressing strands in the top and bottom slabs were reserved,which would be used in either the construction or operation process if needed.The main girder was cantileveredly cast by triangular cable-stayed form travelers with rear supports and segments No.0 were cast with shaped steel brackets.The load test results of the completed bridge indicate that the bearing capacity of the bridge can meet the design requirements.
Located in the middle-low mountainous area of the Dabie Mountain Range,the Guanshi River Bridge is a control project of Macheng-Wuhan Expressway in Hubei Province.The main bridge of the Bridge is a five-span prestressed concrete continuous rigid-frame bridge arranged in separated left and right bridges with span arrangement(67+33×120+67) m,the main girder is of box structure,and the piers of the bridge are designed as two-leg rectangular thin-wall hollow piers with variable sections.In view of the common problems or deterioration that may appear in the construction and operation processes of such type of bridges,the depth of the box girder and the thickness of the bottom slabs were all determined based on the variation of quadratic parabola in the design to improve the mechanical behavior of the structures.And in accordance with the dynamic and life cycle design concept,a given amount of standby ducts for the prestressing strands in the top and bottom slabs were reserved,which would be used in either the construction or operation process if needed.The main girder was cantileveredly cast by triangular cable-stayed form travelers with rear supports and segments No.0 were cast with shaped steel brackets.The load test results of the completed bridge indicate that the bearing capacity of the bridge can meet the design requirements.
引文
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[2]邬晓光,邵新鹏,万振江.刚架桥[M].北京:人民交通出版社,2000.
[3]JTJ 041-2000,公路桥涵施工技术规范[S].
[4]李铮.挂篮悬臂浇筑连续箱梁施工工法的应用[J].世界桥梁,2010,(2):33-35.
[5]JTG D62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[6]JTG D60-2004,公路桥涵设计通用规范[S].
[7]李龙安,屈爱平,何友娣.公路桥梁抗震设计规范反应谱阻尼修正方法研究[J].桥梁建设,2006,(2):43-45,80.
[8]余玲玲,王解军.非一致激励下高墩大跨连续刚构桥地震反应分析[J].中外公路,2010,(2):122-127.
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