高速铁路900吨箱梁双层贝雷梁膺架现浇施工技术(192).doc
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1、yuan, an increase of 17.5%; local government general budget revenue of 500 million Yuan, . Painting, model culture creates new Ma Church community, creating Lake scenic spot culture education base, received high evaluation from provincial and municipal discipline Inspection Commission, the peoples d
2、aily special report. Constantly promote independent Commission against corruption culture construction to rural extends, created established Dahlin rural industry Park independent Commission against corruption culture positions, formed has a support service low double excellent of members lead team,
3、 constantly perfect and established Park funds assets management, and village audit supervision, and villagers democratic financial, system, strengthening Park party, and Chief, and financial, full public, powerful to guarantees has new rural construction, by city rural style clean government inspec
4、tion unit led of height evaluation. Through the implementation of honest and clean government cultural construction, and effectively educate the broad masses of party members and cadres and consciously regulated behavior and discipline, honesty in politics and culture to create a good atmosphere and
5、 fresh development environment. Although we in implement implementation independent Commission against corruption guidelines aspects made has must effectiveness, but away from superior of requirements also exists must of distance, main performance for: a is system enough sound, education, and superv
6、ision, and prevention, and punishment, aspects long-term mechanism also enough perfect, especially in enrollment bid work regulatory aspects also needed strengthening; II is regulatory supervision exists lost of Yu wide, and lost of Yu soft, investigation illegal disciplinary case of efforts also ne
7、eded strengthening, individual sector and cadres also different degree exists treat gift, not to benefits not do, and mess do of phenomenon; Three for honest work is the new situations and new problems in finding timely enough, treatment measures are not strong enough. To solve these problems, we wi
8、ll proceed from the following five aspects of rectification, make sure to implement the provisions of the code. (A) deepening the learning, enhance the consciousness of honesty in politics. To create event as an opportunity to Excel and learning party, further increasing the governance capability an
9、d advanced construction, reinforced rules of the broad masses of party members and cadres awareness, sense of responsibility, sense of honor, improve working ability and level of scientific development. Should make full use of meetings, in particular central group learning opportunity, further stren
10、gthening the study and education of the code, the intensive warning education, education the majority of party members and cadres known fear, knew fear, honesty in politics of tension the strings, consciousness and enhancing the implementation of the initiative. Also, pay attention to apply what the
11、y have learned, consciously study results into planning work, new ideas,高速铁路900吨箱梁膺架现浇双层贝雷梁支架施工技术张书良中铁十二局集团第四工程有限公司 (西安)摘 要 针对地质条件较差地段高速铁路900吨箱梁膺架现浇施工基础处理难度大和费用高的情况,介绍钢管支架搭设在承台上的双层贝雷梁施工技术。本文从方案设计检算、现浇梁施工工艺和安全质量保证措施等方面进行了全面的探讨,可为同类工程提供参考借鉴。关键词 膺架现浇 双层贝雷梁 检算 施工900MT Bridge Box Girders Cast-in Double-l
12、ayer Bailey Beam Support Construction Technique of High-Speed RailwayZhang Shuliang(of China Railway 12TH Bureau Group Co. Ltd , Xian)Abstract As for the matter of the costly and difficult basic handling of high-speed railway 900MT bridge box girders cast-in construction in the poor geology conditio
13、n zone, the double-layer bailey beam support construction technique which the steel pipe is set up on the pile cap is introduced here. This article has made an all-round probe into the checking of the design plan, cast-in girder construction process and safety quality assurance measures etc. It can
14、be taken by the similar projects for reference.Key words cast-in Bridge, double-layer bailey beam, checking, and construction1、前言从2005年我国掀起高速铁路建设第一轮施工高潮以来,目前我国已经进入了第二轮高铁建设高潮,而高速铁路900吨现浇箱梁的施工技术也日臻完善。现浇梁的施工主要有移动模架制梁、碗扣支架现浇梁、满堂支架现浇梁、工字钢支架膺架现浇梁、贝雷梁支架膺架现浇梁等等很多的形式。在膺架制梁的施工技术中,基本上都需要对支架基础进行各种处理,而地质条件的好坏又关系
15、基础处理费用和成本。在实际施工中,具体施工方案确定是依据其施工成本综合来考虑的。在膺架制梁中采用双层贝雷梁施工技术,支架支立在承台上而不需地基处理的施工方法在实际施工中用得还不多。本文以厦深铁路32米现浇梁为依据对双层贝雷梁施工技术进行了探讨和研究,解决了结构的检算、结构加固和施工等难题,为膺架现浇梁的施工技术开辟了一条途径。2、支架搭设2.1 材料选择支架搭设钢管采用6308螺旋钢管;剪刀撑采用14槽钢;钢管顶上横梁采用2I63a工字钢;贝雷梁采用装配式公路贝雷梁;贝雷梁顶横梁采用I20a工字钢;箱梁模板采用拼装式整体钢模板;标高调节和落模采用16吨螺旋式千斤顶。2.2 支架搭设在承台支立一
16、排5根6308螺旋钢管,钢管间距2.4m。钢管安装之前测量放样,将钢管支立的位置在承台上标识出来。钢管安装要在一条直线上,垂直度不得大于0.5%,保证钢管顶在一条直线上,钢管轴心受压。钢管底用膨胀螺栓与承台锚固牢固,空隙部位要用钢板支垫牢固。桥墩施工时在墩顶以下4m和8m位置在钢管对应位置预埋钢板,用14槽钢将钢管固定在墩身上。钢管与钢管之间用14槽钢焊接剪刀撑,焊缝焊接饱满,不得有焊碴、焊瘤。在钢管顶安放2I63a工字钢,工字钢与工字钢之间用连接板焊接在一起。工字钢必须位于钢管桩的顶部中心位置,防止钢管桩偏心受压。工字钢长度不够时可以采用连接板进行对焊连接,接头位置必须位于钢管桩顶部位置。工
17、字钢与钢管顶之间的空隙用不同厚度的钢板支垫密实,在每个钢管顶位置工字钢两侧用I16a工字钢斜撑牢固,确保工字钢稳定性。工字钢横梁上布置双层贝雷梁,翼缘板下布置4排双层贝雷梁;腹板位置布置6排双层贝雷梁;上盖板和下底板位置布置3排双层贝雷梁(半幅布置数量)。两片贝雷梁采用45花窗连接,在双层贝雷梁的上下层位置每隔4米用14槽钢横向将所有贝雷梁连接为一整体。翼缘板下4排贝雷梁在支点位置采用两根20加强竖杆,靠支垫位置上下各增加一根加强弦杆。腹板和底板位置贝雷梁在支点位置采用两根20加强竖杆,在离支点1.5m位置竖杆采用I8工字钢加强;在3.0m范围斜杆采用I8斜杆一根加强于原斜杆旁。在4.5m范围
18、上下层贝雷梁采用加强弦杆加强。贝雷梁加强位置各加强杆件的焊接必须饱满,质量达到相关要求。贝雷梁上布置I20a工字钢横梁,横梁间距1.0m,其位置与钢模板背桁架一一对应。桁架与I20a工字钢之间布置16吨螺旋千斤顶,一排横向布置13个千斤顶。千斤顶也模板之间必须顶紧,保证其充分受力。3 支架计算3.1依据(1)通桥(2008)2221A、漳江双线特大桥设计图。(2)铁路桥梁钢结构设计规范16Mn钢=210Mpa,=120Mpa。(3)装配式公路钢桥多用途使用手册(4)公路施工手册3.2杆件截面验算与允许承载力验算(1)桁架弦杆容许轴力:弦杆截面积Am=25.48cm216Mn钢容许应力为=210
19、Mpa,弦杆上为了安装风勾在开有椭圆形孔,故其强度会降低,取有效断面系数为0.809。(2)桁架竖杆容许应力:竖杆截面积Am=9.52cm216Mn钢容许应力为=210Mpa,由x =52.5 则稳定系数=0.818(3)桁架斜杆容许应力:斜杆截面积Am=9.52cm216Mn钢容许应力为=210Mpa,由x =74.2 则稳定系数=0.66(4)桁架容许刚度:3.3荷载设计值(1)模板和装配式钢桥自重:模板(千斤顶和贝雷梁上横梁重计入):装配式钢桥:模板和装配式钢桥自重设计值:61.41.2+47.84121.52(2)箱梁自重C50混凝土方量310.6m3;混凝土容重25KN/ m3C50
20、混凝土重:310.625=7765 KN普通钢筋重:1.95+54.357=56.307t=563.57KN预应力钢筋重:117.25KN每孔梁重: 每孔梁重设计值:259.11.2=310.9KN/m(3)施工附加荷载:施工人员和施工设备:1.01.45.57.7 振捣混凝土产生的竖向荷载:1.01.45.5=7.7;倾倒混凝土时产生的冲击荷载:1.01.45.5=7.7施工附加荷载设计值:7.73=23.1荷载总值:3.4箱梁计算荷载模型划分(1)各部分面积计算:1/2箱梁截面划分为第部分;第部分;第部分各部分面积如下:A=2.16m2A=0.77 m2A=1.12 m2全截面总面积为:A
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