CN100357524C - 一种对大跨度坦拱桥进行加固的方法 - Google Patents

一种对大跨度坦拱桥进行加固的方法 Download PDF

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CN100357524C
CN100357524C CNB2005101050174A CN200510105017A CN100357524C CN 100357524 C CN100357524 C CN 100357524C CN B2005101050174 A CNB2005101050174 A CN B2005101050174A CN 200510105017 A CN200510105017 A CN 200510105017A CN 100357524 C CN100357524 C CN 100357524C
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CN1740446A (zh
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周建庭
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Chongqing Communications Construction Group Co ltd
Chongqing Jiaotong University
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CHONGQING JIAOTONG INSTITUTE
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Abstract

本发明公开了一种对大跨度坦拱桥进行加固的方法,其包括如下步骤:(1)增设支墩:通过桥梁内力计算分析,确定支撑点位置,在支撑点浇钢筋砼支墩,钢筋砼支墩的上端接近主拱圈;(2)进行刚化处理:把在两支墩分叉间的主拱圈进行钢化处理;(3)将支墩和主拱圈连接:在钢化后的主拱圈与支墩之间增设支座,使支墩和钢化后的主拱圈间形成铰接;(4)对支墩和主拱圈之间的空隙用膨胀混凝土进行浇注,形成支撑。本发明的这种加固方式,通过合理的增设多点支撑的方式加固拱桥,减少桥梁活载弯矩。经实践证明,这种加固桥梁的方式,可以使主拱圈减少活载引起的弯矩值的20%——50%,效果较好。

Description

一种对大跨度坦拱桥进行加固的方法
技术领域
本发明涉及一种对拱桥进行加固的方法,特别涉及一种对大跨度坦拱桥进行加固,减少活载引起的弯矩值的方法。
背景技术
拱桥中,对于矢跨比较小的大跨度坦拱桥,由于拱桥产生的水平推力较陡拱大,承载潜力相对要小一些,拱桥的力学性态带有梁式桥的倾向,造成这类拱桥加固难度的加大,如采用常规的加固技术,如锚喷增大截面技术、钢筋混凝土套箍加固技术等,由于桥梁的跨度大,将增加过多的恒载,桥梁加固效果不显著。
发明内容
针对上述现有技术存在的缺点,本发明的目的在于提供一种加固效果更好的对大跨度坦拱桥进行加固的方法,
本发明采用的技术方案是:一种对大跨度坦拱桥进行加固的方法,其包括如下步骤:
(1)增设支墩:通过桥梁内力计算分析,确定支撑点位置,在支撑点浇钢筋砼支墩,钢筋砼支墩的上端接近主拱圈;
(2)进行刚化处理:对支墩两分叉间的主拱圈进行刚化处理;
(3)将支墩和主拱圈连接:在刚化后的主拱圈与支墩之间增设支座,使支墩和刚化后的主拱圈间形成铰接。
(4)对支墩和主拱圈之间的空隙用膨胀混凝土进行浇注,形成支撑。
所述的对大跨度坦拱桥进行加固的方法,在步骤(1)中钢筋砼支墩的两个分叉的上表面与主拱圈下表面之间的距离可以为40-100厘米。
所述的对大跨度坦拱桥进行加固的方法,在步骤(2)中的刚化处理是通过增设钢筋砼套箍层来实现。
所述的对大跨度坦拱桥进行加固的方法,在步骤(3)中所增设的支座为橡胶支座。
由于坦拱桥矢跨比比较小,桥梁具有梁式桥的倾向,主拱圈截面将产生较大的弯矩,本发明通过在大跨度坦拱桥安装多点支撑,合理增设支撑后,主拱圈可减少活载引起的弯矩值,从而达到加固桥梁的目的。
下面结合附图及具体实施例对本发明作进一步的详细说明。
附图说明
图1为本发明的大跨度坦拱桥增设多点支撑的示意图;
图2为本发明的多点支撑加固大跨度拱桥结构示意图;
图3-a为加固前拱桥主拱圈弯矩包络图;
图3-b为加固后主拱桥主拱圈弯矩包络图。
具体实施方式
如图1-2所示,本发明的对大跨度坦拱桥进行加固的方法,其包括如下步骤:
(1)增设支墩:根据需要加固的桥梁的内力进行计算分析,从而确定出需要支墩的数量,每个支墩点的位置,以及支墩的横截面积,然后在确定的支撑点的位置浇铸钢筋砼支墩,钢筋砼支墩的上端要接近主拱圈的位置,钢筋砼支墩的上端为有两个分叉的结构,钢筋砼支墩的两个分叉的上表面与主拱圈下表面之间的距离可以为40-100厘米。
(2)进行刚化处理:对支墩1两分叉间的主拱圈2进行刚化处理,可以通过增设钢筋砼套箍,从而在主拱圈外增加钢筋砼套箍加固层3来对主拱圈2进行加固,也可以通过其它方式来对主拱圈进行刚化处理。
(3)将支墩和主拱圈连接:在刚化后的主拱圈2与支墩1之间增设橡胶支座4,使支墩1和刚化后的主拱圈间形成铰接,这里的橡胶支座4也可以是其它类型的支座。
(4)对支墩和主拱圈之间的空隙用混凝土进行浇注,形成支撑,为了使支撑具有预顶作用,在浇筑的混凝土中掺入适量的微膨胀剂,这样可以使活载上桥后,增设的支撑就会发挥作用,承受荷载。微膨胀剂的数量要根据具体桥梁所需要的膨胀率计算。
图3-a为加固前拱桥主拱圈弯矩包络图;图3-b为加固后主拱桥主拱圈弯矩包络图,从两张图的比较可以看出,本发明的这种加固方式,通过合理的增设多点支撑的方式加固拱桥,减少桥梁活载弯矩。经实践证明,这种加固桥梁的方式,可以使主拱圈减少活载引起的弯矩值的20%--50%,效果更好。

Claims (4)

1、一种对大跨度坦拱桥进行加固的方法,其特征在于:其包括如下步骤:
(1)增设支墩:通过桥梁内力计算分析,确定支撑点位置,在支撑点浇钢筋砼支墩,钢筋砼支墩的上端接近主拱圈;
(2)进行刚化处理:对在支墩两分叉间的主拱圈进行刚化处理;
(3)将支墩和主拱圈连接:在刚化的主拱圈与支墩之间增设支座,使支墩和刚化后的主拱圈间形成铰接;
(4)对支墩和主拱圈之间的空隙用膨胀混凝土进行浇注,形成支撑。
2、根据权利要求1所述的对大跨度坦拱桥进行加固的方法,其特征在于:在步骤(1)中钢筋砼支墩的两个分叉的上表面与主拱圈下表面之间的距离为40-100厘米。
3、根据权利要求1或2所述的对大跨度坦拱桥进行加固的方法,其特征在于:在步骤(2)中的刚化处理是通过增设钢筋砼套箍层来实现。
4、根据权利要求3所述的对大跨度坦拱桥进行加固的方法,其特征在于:在步骤(3)中所增设的支座为橡胶支座。
CNB2005101050174A 2005-09-26 2005-09-26 一种对大跨度坦拱桥进行加固的方法 Expired - Fee Related CN100357524C (zh)

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CN102251488A (zh) * 2011-04-20 2011-11-23 中铁二十三局集团第三工程有限公司 石砌旧拱桥加固结构
CN102995553B (zh) * 2012-11-27 2014-08-27 胜利油田胜利工程建设(集团)有限责任公司 一种钢筋混凝土拱桥拱肋的制作方法

Citations (4)

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Publication number Priority date Publication date Assignee Title
US4192120A (en) * 1976-12-17 1980-03-11 Entreprises de Travaux Publics et Prives J. Richard Societe Anonyme Method of constructing reinforced concrete bridges
JPH05239810A (ja) * 1992-02-27 1993-09-17 Fujita Corp 鉄筋コンクリートアーチ橋の施工法
GB2302896A (en) * 1995-07-01 1997-02-05 William George Edscer Arch reinforcement
CN1570278A (zh) * 2004-05-12 2005-01-26 兰州理工大学 拱桥预应力结构

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192120A (en) * 1976-12-17 1980-03-11 Entreprises de Travaux Publics et Prives J. Richard Societe Anonyme Method of constructing reinforced concrete bridges
JPH05239810A (ja) * 1992-02-27 1993-09-17 Fujita Corp 鉄筋コンクリートアーチ橋の施工法
GB2302896A (en) * 1995-07-01 1997-02-05 William George Edscer Arch reinforcement
CN1570278A (zh) * 2004-05-12 2005-01-26 兰州理工大学 拱桥预应力结构

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