《预应力砼简支梁桥位灌注施工》.doc
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1、 高速铁路非标准简支梁施工工法中铁十八局集团有限公司桑松龄 栾兆增 曹海清1 前言随着近几年高速铁路的大发展,在京沪高速铁路建设中,桥梁占到正线长度的86.5%,而桥梁中多数为简支梁桥,绝大多数的标准简支梁在梁场利用定型钢模板在梁场预制,而非标准梁因跨度不一,若采用预制梁,将加大施工生产成本。沧德特大桥该段桥地震动峰加速度为0.1g,场地类别为类。我工区承担的后张法预应力混凝土简支箱梁为沧德特大桥B29B30号墩、B57B58及C68-C69号墩之间的非标梁。其中,B29B30号墩箱梁计算跨度为19.5m,B57B58号墩箱梁计算跨度为30.8m, C68-C69号墩箱梁计算跨度为29.8m。
2、该段简支箱梁均位于直线上,且地势较为平坦,梁体混凝土强度为C50。箱梁结构形式设计为单箱单室等高简支梁,梁端顶板、底板及腹板局部向内侧加厚,在结构外侧的腹板与顶底板相交处均采用圆弧倒角过渡 。梁高3.05m,底宽为5.5m,梁顶宽12.0m。在腹板上设100mm的通风孔,底板上设90mm的泄水孔。2工法特点2.1搭设满堂支架作箱梁底板支撑系统;2.2内模采用木模。内模采用10槽钢作支撑骨架分节拼装,骨架之间接头采用斜法兰连接,拆卸方便。模板采用3.5cm厚木板,在内模骨架的顶面与侧面安装木板与骨架通过螺栓固定后,再在木板表面上包裹地板革作为内模的面层。内模底部不安装模板,主要考虑底板混凝土入模
3、与振捣方便。2.3利用全站仪、电子水准仪等仪器对桥面六面坡及桥梁外缘进行精确定位,确保桥梁的整体线形。3适用范围适用于平原地区非标准简支桥梁施工。4工艺原理采用搭设满堂支架作箱梁底板支撑系统,原位现浇法施工工艺,底板、腹板与顶板一次性浇筑成型。5施工工艺流程及操作要点5.1 总体施工工艺流程地基加固、硬化处理场地平整搭设满堂支架做混凝土试件kuai件第二次预应力张拉、压浆,封锚第一次预应力张拉、压浆、养护安放石屑袋沉降观测混凝土拌和运输钢 筋 加 工拆底模和支架拆内模、拆侧模与端模养 护浇注混凝土安设各种预埋件、预留孔绑扎顶板钢筋安装内模与端模绑扎底、腹板钢筋,安波纹管卸载、安装底模侧模支架预
4、压图51现浇箱梁施工工艺流程图5.2 满堂支架施工5.2.1、基础处理碗扣式满堂支架搭设前须进行基底处理。具体做法为:将原地表土挖除1m深,然后分层回填,并用压路机压实,之后填筑40cm厚10灰土填筑压实;每层压实厚度不少于20cm,利用18振动压路机分层碾压。碾压稳定后,观测表面平整、无轮痕,再通过试验进行检测。处理后的地基高出原地面不小于20cm,并做成不小于2的单面或双面坡,以便于下雨时排水顺畅。满足支架地基设计承载力要求后,在支架基础四周挖好排水沟,作好排水系统。5.2.2、搭设支架现浇箱梁采用满堂碗扣支架搭设。(1)支架布置碗扣式满堂支架布置示意图详见满堂支架布设图。1、箱梁中部(底
5、板与腹板等截面部分):立杆按纵向步距60cm、横向步距60cm,水平横杆竖向间距120cm设置。2、箱梁端部(梁端底板与腹板加厚部分):立杆纵向步距60cm、横向步距60cm,水平横杆竖向间距120cm设置。3、箱梁翼缘板部:立杆纵向步距90cm、横向步距90cm,水平横杆竖向间距120cm设置。经检算上述布置原则满足承重支架横杆、立杆验算要求,将支架搭设具体方法,详细交底至施工队。5.2.3、支架预压试验考虑梁体自重、地面下沉及支架的弹性和非弹性变形等因素影响,需对支架进行预压。预压采用砂袋预压,在梁体底模方木上或临时木板上采用1.2倍梁体自重的砂袋进行支架预压。在预压范围内,四周用袋装沙子
6、围挡,中部用钢材。钢材的分布尽量与梁各部自重成比例。测点布设:每跨纵桥向设5个断面(约间隔5m设1个),每个断面设10个测点,上下各5个,上部5个测点分别设在两侧翼缘板各1个、两腹板处各1个,梁中心线底板处1个;下5个测点分别设在对应上5个的水平投影位置左右,并且在枕木上。对各测量点进行编号,以便预压时进行对比观测,控制模板立模标高。Opinions and suggestions on the partys mass line educational practiceAccording to the central and provincial, municipal unified depl
7、oyment, according to municipal Party committee about carrying out the partys mass line educational practice activity in the citys implementation opinions, the spirit of the partys mass line educational practice activities from 20* in January to 99 months, carried out at all levels of departments and
8、 directly affiliated institutions and grass-roots party organizations. According to my actual County, the county to carry out the education practice put forward the following implementation opinions.First, the overall requirementsCounty county education practice to the eighteen Party of eight, the s
9、pirit of the the third Plenary Session of the 18th CPC Central Committee as the guidance, conscientiously implement the spirit of general secretary Xi Jinping book series of important speech, earnestly implement the Central Committee really, opinions and advice , party implementing the guiding ideol
10、ogy of opinions to determine the objectives and requirements, step method, in accordance with the look in the mirror, dress up, wash bath, cure treatment, the general requirements of for the people pragmatic honest people as the theme, in carrying forward the spirit of Zhuanglang Zhuang, improve the
11、ir work style, service to the masses of the people, the foundation of consolidating grassroots, promote transformation across efforts, to further implement the central eight regulations and The opposition party and government austerity waste regulations , double section provincial regulations, munic
12、ipal provisions of the twelve plan and the implementation measures for on improving the work style of close ties with the masses law, highlight style building, carry out the whole wind spirit, resolutely oppose formalism, bureaucracy, hedonism and wasteful extravagance to solve the problems, Party m
13、embers and cadres of the style and the masses of people strong, the Ministry of Party members and cadres to further improve their thinking and understanding, to further change the style of the wind, the masses to close, honest and pragmatic people honest image to further establish the foundation to
14、further reinforce the basic level. Style of the building of the new results to promote the construction of a powerful force of the county and the ecological culture of the county and county construction.In educational practice activities of the unit is mainly: the county and below county departments
15、 under the organs, enterprises and institutions directly under the township, street, and community, village, non-public economic organizations, social organizations and other grass-roots organizations. Agencies and branches, each single unit, follow the rules on internal institutions. Educational pr
16、actice with step by step.To adhere to the county leadership, leadership and leading cadres to focus on outstanding catch to directly contact the service of the masses of law supervision departments and window units, service industry, educational practice, pay attention to grasp the heavy towns, stre
17、ets and villages, community education activities and the masses of grassroots groups in close contact to strengthen, and the majority of Party members, cadres and the mass line line Marx doctrine view of the masses and the partys education.Always speak seriously as a basic attitude, adhere to positi
18、ve education, to carry out criticism and self criticism group, adhere to the pragmatic, more emphasis on leadership, pay more attention to the layers of the demonstration, more focus on the four winds, solve the problem, pay more attention to open the door, the participation of the masses, pay more
19、attention to the classification guidance. Orderly, pay more attention to the cooperation and cohesion driven, more strict requirements on injection, really supervision practice, ensure education practice is not empty is not empty is not partial, not as a mere formality.Two, the key point of the task
20、The main task of the countys education practice is to seize against four wind this focus on centralized solve outstanding problems asked County, township leadership and leading cadres of the four winds, the disadvantages of the style, scale behavior to a large scale investigation, overhaul, cleaning
21、 greatly. At the same time, respond to the concerns of the masses, safeguard the interests of the masses, pay attention to solve practical problems, solve the people around the unwholesome tendencies especially on eat, take the card, Yong lazy luxury, extravagance and waste fees, privileges and othe
22、r issues, timely and effective, without any discount to solve, to improve the style of real implementation of the requirements of real to the grassroots, real let group Benefit the public.(a) focus on solving the four winds outstanding issuesThe central and provincial requirements, the county leader
23、ship and leading cadres of key performance concept is not correct, do not dare to play, to engage in image project, political project, a leadership guide, a set of ideas, orders and prohibitions, and a policy, there are countermeasures county. The units directly under the heavy focus on solving Yung
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