w墩顶现浇连续段施工方案.doc

【精品文档】如有侵权，请联系网站删除，仅供学习与交流w墩顶现浇连续段施工方案.精品文档.墩顶现浇连续段施工方案一、工程概况 我合同段K77+459皂市河特大桥引桥上部构造为先简支后结构连续箱梁，箱梁预制长度两侧引桥为30m，主、引桥的过渡处采用28米多长的箱梁配跨，使引桥同墩位处左右两侧同桩号。根据本桥设计分联情况，在3#、4#、6#、7#、9#、10#、11#、13#、14#、15#、22#、23#、24#、26#、27#、29#、30#、31#墩墩顶现浇连续段，其它简支墩墩顶安装伸缩缝，现浇墩顶连续段砼设计标号为C50，与梁体同标号，所用水泥为微膨胀水泥。 二、施工工艺  1、施工顺序 箱梁安装就位后，要及时进行墩顶现浇段施工。现浇墩顶连续段的施工顺序为：在永久支座上安装支座模板按设计要求连接纵向钢筋和绑扎构造钢筋安装墩顶连续段负弯矩预应力束波纹管立侧模进行箱梁的横隔板连接，浇注纵缝混凝土和横隔板砼-浇筑现浇段混凝土（掺高效减水剂和微膨胀剂）张拉墩顶预应力连续束-压浆拆除临时支座-浇注护栏、清洗桥面 铺设桥面钢筋网（钢筋网纵向钢筋连续通过现浇段）浇筑桥面混凝土- 安装伸缩缝。 对于本桥墩顶连续段每联采用跳浇法施工，首先施工28#墩32墩一联，具体的浇注顺序为：浇注29、31号墩顶连续段，张拉29、31号墩顶负弯矩束，孔道压浆；再浇注30号墩顶连续段，张拉30号墩顶负弯矩束，孔道压浆。其它每联以此类推。  2、施工方案 2.1安装永久支座模板 支座模板采用竹胶板，以便加工成相应的形状和尺寸的模板。安装模板时，要确保模板底部与支座顶面相平，用对向木楔打紧固定，以便拆除。永久支座与底模间的缝隙用海绵条夹紧，以防止漏浆。 2.2钢筋、钢束施工 现浇段预应力束管道与预制箱梁的对应束管道顺接，并确保连接可靠，不漏浆；现浇段处纵向连接钢筋的焊接宜左右、上下对称进行，以免焊接温度引起箱梁端部变位。两梁端部伸出的预留纵向钢筋按设计和规范要求彼此焊接。 2.3支立侧模 现场技术员对箱梁钢筋按照规范要求进行检查，并填写相应的施工资料，请内部监理工程师验收合格后，报请监理工程师抽检，验收合格后方可进行模板施工。 连续段外侧模采用竹胶板，做成同边梁外侧模板相同的形状、尺寸，靠支撑在盖梁上的斜撑固定；横隔梁侧模、底模采用竹胶板后面加10*10方木组成定形，对拉杆固定。横隔梁下侧对拉杆的位置即为底模方木底的位置。 2.4混凝土施工 2.4.1试验准备 水泥、砂、碎石应按有关规范做相关试验。配制混凝土所用的细骨料，除应符合公路桥涵施工技术规范11.2.2条的规定外，还应满足：宜使用级配良好的中砂，细度模数不小于2.6，含泥量应小于2%。配制混凝土所用的粗骨料，除应符合公路桥涵施工技术规范（以下简称桥规）11.2.3条的规定外，还应满足：应使用质地坚硬、级配良好的碎石，骨料的抗压强度应比所配制的混凝土强度高50%以上，含泥量应小于0.5%，针片状颗粒含量应小于5%，骨料的最大粒径宜小于20。拌和用水应符合桥规11.2.4条的规定。如骨料不符合规范要求，不得进入料场。墩顶现浇段砼采用C50，已经高驻办、中心试验室批准。 2.4.2浇注混凝土 混凝土采用拌和站集中拌和，罐车运输至现场，倒退溜放入模，人工控制入模位置和入模速度。混凝土分层浇注，分层振捣，每层30cm。砼的振捣采用插入式振捣棒振捣，尽量采用小的插入式振捣棒振捣，不得触及波纹管，所有振捣时间的控制均以砼面不再下沉且砼表面呈现平坦泛浆为原则。 现浇段混凝土石子粒径不大于2cm，混凝土按设计和规范规定掺高效减水剂和微膨胀剂，坍落度控制在1216cm。浇筑每段砼在抹面时，应注意控制砼顶面平整度。现浇段浇注完成定浆后，应及时收浆、抹面，并控制好砼顶面平整度，做好拉毛处理；混凝土顶面要撒水、覆盖养生。 2.5负弯矩预应力施工 2.5.1钢绞线的切割与编束 钢绞线下料长度必须控制准确，不能下短。下料长度应根据设计孔道长度和张拉千斤顶的工作长度确定。钢绞线采用砂轮切割机切割下料，严禁采用气割下料。先在地面上量出下料长度距离，将钢绞线接头拉至一端，在另一端处用切割机切断，用绑丝在钢绞线两端缠紧。根据图纸要求注明钢束编号，以免弄错，砂轮片应为增强型，以防锯片碎裂，飞出伤人。 钢绞线端部，在与工作锚、工具锚接触的部位，应清除浮锈，防止张拉时打滑。若钢绞线表面已经形成降低强度与延伸率的腐蚀坑，则不能使用，以防张拉锚固过程中产生脆断，飞出伤人。 2.5.2 穿束 穿束在砼浇筑前进行，穿束前墩顶波纹扁管应对应的连接，单根钢束用人工从一端向另一端顶进，穿束后应检查预应力钢绞线外露情况是符合规范要求，在墩顶波纹管连接处用透明胶带缠紧，并检查其密封性，确保无空隙。 2.5.3负弯矩预应力张拉 2.5.3.1技术准备 现浇段砼浇筑时，制作与现浇段同等条件下养生的砼试块，当砼强度达到设计强度的90%时，进行预应力张拉施工。张拉机具采用150t千斤顶两台和配套的油泵2套，千斤顶在使用前已进行标定，千斤顶与压力表配套校验。将标定和校验结果上报监理工程师，以确定张拉力、油表读数与伸长量之间的关系，经监理工程师签字认可后方可用于本工程。根据设计要求确定张拉吨位，墩顶负弯矩张拉采用伸长量与张拉力双控制，单根钢绞线张拉力为： F=1.00×K×S=1.00×0.75×1860×140=195.3KN 2.5.3.2张拉操作步骤： 穿上钢绞线，装好工作锚，打上工作夹片，注意夹片打齐；     装上限位板，随后装上千斤顶，注意调整好位置，使钢绞线顺直；     装上工具锚和工具夹片，打齐夹片；     接好油路，装上压力表，接好电路；     按先长束后短束的张拉先后顺序，两端同时对称张拉；     张拉至设计吨位的10%时，量取伸长值L1；张拉设计吨位的20%时，量取伸长值L2；张拉至设计吨位的100%时，量取伸长值L3；     张拉至设计吨位的100%后，锚固并持荷2min，计算伸长量L=（L2-L1）+(L3-L1)=L2+L3-2L1，检查L是否在理论伸长量误差范围之内（伸长率不超过±6%），若不在误差范围之内，查明原因后再张拉； 张拉过程：张拉分3级张拉，过程如下：                                O   10%K      20%K     100%K（锚固并持荷2min）；各钢束对称张拉的顺序为：N2的100%   高端N1的100%    低端N1的100%。 张拉完成后，拆掉千斤顶，工具锚、工具夹片。 2.5.4预应力施工注意事项： 张拉前，张拉设备应经工程师同意的独立试验室进行校准，且千斤顶一般使用超过6个月或200次或在使用过程中出现不正常现象时，应重新校准。 张拉前，必须检测与现浇段同条件下养生的砼试块强度，当砼强度达到设计值的85%以上时才能张拉。 安装工具锚、工具夹片时，必须检查锚孔是否生锈或有毛刺，如果有不能使用。 千斤顶就位时，其轴线必须与管道轴线顺直，防止钢绞线弯折。 钢束的张拉顺序必须符合规范要求，不得改变，千斤顶和油表应严格按照标定结果配套使用；  实际延伸量与理论延伸量容许误差为±6%，伸长量超规时，分析原因后再进行张拉；每束钢绞线断丝滑丝数不容许超过1根，每个断面不超过该断面的钢丝数的1%； 2.5.5张拉过程安全注意事项： a张拉时，千斤顶后禁止站人，油泵司机、量取伸长量站在梁的两侧进行操作； b.听到异常响动时，张拉必须停止，分析原因； c.张拉时，必须设置警示牌，提醒桥上行人； d.油泵移动时，油表必须拆下来，防止被震坏；  d、高压油泵与千斤顶之间的连接点，各接口必须完好无损。油泵操作人员要戴防护眼镜；油泵开动时，进、回油速度与压力表指针升降，应平稳、均匀一致。安全阀要经常保持灵敏可靠； 2.5.6 预应力管道压浆 张拉结束后应立即压浆，以减少预应力损失，压浆的水泥浆强度不低于50MPa，并符合如下规定： 水泥标号不低于42.5； 水灰比采用试验批准的配合比。 水泥浆中掺入膨胀剂，水泥浆掺入膨胀剂后的自由膨胀率应小于10%，水泥浆的泌水率最大不宜超过3%，拌和后3h泌水率宜控制在2%，24h后泌水应全部被浆吸回； 水泥浆稠度宜控制在1418S之间。 管道压浆前，先用清水对管道进行预压清洗、润湿。压浆使用活塞式压浆泵，压力控制在0.50.7Mpa之间。压浆采用一端压入另一端出浆的方式，压浆应达到孔道另一端饱满和出浆，并应达到排气孔排出与规定稠度相同的水泥浆为止。为保证管道中充满灰浆，关闭出浆口后，应保持不宜少于2min、压力不小于0.5Mpa稳压期。为避免水泥浆表面的泡沫用于压浆，压浆泵吸浆管需插到浆池底部，并且每次压浆时浆池上部含泡沫的浆液不得使用。 现场压浆操作人员必须戴防护眼镜，防止水泥浆喷出伤人。 3、湿接缝、横隔板施工 将湿接缝、横隔板连接筋调整顺直，焊接横向连接钢筋。焊接时，焊缝要饱满，焊缝厚度小于8。 沿箱梁翼板底湿接缝位置吊放带肋竹胶板作为湿接缝的底模，通过粗铁丝30cm的间距吊于板顶砼上，经检查牢固后方浇注混凝土。湿接缝混凝土设计为50号。混凝土采用拌和站集中拌和，罐车运输至桥上，倒退直接溜放入模，人工控制入模位置和入模速度，采用插入式振捣棒振捣。 横隔板也采用竹胶板，底模采用拉杆吊于梁顶砼面上，侧模通过纵向对穿上下两排拉杆贴合在箱梁横隔板上，注意密封，以防漏浆。 4、体系转换 墩顶现浇段的混凝土强度达到设计强度90%经监理同意后，张拉墩顶负弯矩区预应力束。张拉时应对称分级，分联从外侧向内侧张拉、从端跨向中跨张拉。张拉结束后及时压浆。 一联墩顶现浇段、湿接缝及横隔板混凝土全部浇注完成后，方可拆除临时支座，使箱梁由简支体系转换为连续体系。临时支座拆除时，逐孔对称、均匀、同步、平稳进行。一联内临时支座应从两端对称依次向联中心拆除。 三、质量保证措施 1、建立由项目经理、总工程师、内部监理工程师主抓质量，工区技术员、操作工人各自负责本职工作的工程质量的完善的质量保证体系。经常性的组织进行质量教育，提高全员质量意识，制定有自检、互检、工序交接检查的办法和质量否决权办法。 2、实行质量岗位责任制：从项目经理、副经理、总工程师和技术管理人员，总工程师、副经理、内部监理工程师和下属的工区主任、操作工人，均实行全员质量岗位责任制，工程质量的好坏分别与各人的工资、奖金挂钩，发生质量问题或质量事故根据三不放过原则（不查清楚原因不放过；不处理好不放过；不受到教育不放过）进行处理，并进行奖罚。 3、 组织技术人员、管理人员、操作工人进行施工前的技术交底，下达，使现场施工人员掌握质量控制点，以尽快投入到本项工程的施工生产中，确保工程质量。 4、工地试验室严格按照操作试验规范对各种材料、半成品、成品进行试验、检验，严把质量关。 1） 原材料的质量检测：对用于本工程的地材，必须经试验合格，报监理审批后方能进场。钢筋、水泥购进时，必须有出厂合格证，进场后需取样进行复检。 2） 砼工程质量控制：每次砼拌和前，现场试验人员必须核对所用水泥、砂、石、外加剂是否与配合比一致。测定砂石的含水量，换算成施工配合比后送交拌和站，每台班或每单项工程至少测坍落度一次。按规范要求制作砼试块，并按时编号，拆模、养护，按龄期试压，根据规范要求对砼进行综合性的质量评定。 3）张拉必须满足混凝土强度和龄期达到设计要求方可张拉，张拉按照技术交底和有关规范施工，发现问题及时分析解决。 质量保证体系框图如下： 质量保证体系框图 项目经理:刘法民 项目总工:刘尚志 项目内部监理工程师：黄启华 测量组：孟智超 试验室：吕 娜 技术质量部:窦国文 桥梁一工区上部构造现浇段施工：姚智勇   四、安全保证措施 箱梁现浇段施工属于高空作业，安全工作要引起高度重视： 1、特殊工种的操作工人要做到有安全操作证才能上岗工作。 2、在工程现场周围设置并维护必要标志牌，包括警告与危险标志、安全与控制标志、指路标志等。 4、起重作业的技术工人，上岗前要进行检查和技术考核，合格后方可操作。 5、进入施工现场的人员必须佩带好安全防护用品。 6、进行用电安全知识教育，定期检查、检修电器设备。对电器设备外壳要进行防护性接地，接零或绝缘，派专人负责电器安全工作。 7、用电线路架设应符合规定要求，配电箱和闸刀盒应上锁，所有配电箱必须安装漏电保护器，配电箱和闸刀盒应有良好的防护措施。 8、夜间施工时，现场必须有符合操作要求的照明设备。施工驻地要设置路灯。 9、当跨越行人较多的便道的现浇段施工时，梁的下部要采取有效的措施进行防护，以防止伤及过路的行人和车辆。 10、箱梁上的材料和工具要堆放整齐，木料、模板、半成品的堆放、废料堆集应做到统筹安排，合理布局。杂物应及时清除。 11、从事高处作业人员要定期或随时体检，发现有不宜登高的病症，不得从事高处作业。严禁洒后登高作业。 12、高处作业所用的梯子不得缺档和垫高，同一架梯子不得二人同时上下，在通道处（或平台）使用梯子应设置围栏。 13、用人工搬运、支立模板时，应有专人指挥，所用的绳索要有足够的强度，绑扎牢固。支立模板时，底部固定后再进行支立，防止滑动、倾覆、掉落。 14、高处作业应将所需工具装在工具袋内。传递工具不得抛掷或将工具放在平台和木料上，更不得插在腰带上。 15、在用斧锤作业时，应照顾四周和上下的安全，防止误伤他人。斧头刃口处应配刃口皮套。（安全保证体系框图附后） 16、吊车浇注混凝土时，要有专人负责指挥，灰斗与钓钩一定要连接牢固。（安全保证体系框图见后页图） 五、施工机械配备 机械设备一览表 序号 名称 规格 数量 备注 1 钢筋成型机 GW40D 1台  2 钢筋切断机 GW40D 1台  3 电焊机 BX1-500 4台  4 卷扬机 3t 2台  5 电锯  2台  6 振捣棒 4m长 4个  7 千斤顶 QYC150 2个 8 油泵  2台  9 压浆机  1台  10 罐车 8m3 2台  11 混凝土拌和站 HJS-75 1台  12 吊车 25T 1台 （英文版 ） Two regulations promulgated for implementation is in the party in power for a long time and the rule of law conditions, the implementation of comprehensive strictly strategic plan, implementation in accordance with the rules and discipline to manage the party, strengthen inner-party supervision of major initiatives. The two regulations supporting each other, the < code > adhere to a positive advocate, focusing on morality is of Party members and Party leading cadres can see, enough to get a high standard; < rule > around the party discipline, disciplinary ruler requirements, listed as "negative list, focusing on vertical gauge, draw the party organizations and Party members do not touch the" bottom line ". Here, the main from four square face two party rules of interpretation: the first part introduces two party Revised regulations the necessity and the revision process; the second part is the interpretation of the two fundamental principles of the revision of laws and regulations in the party; the third part introduces two party regulations modified the main changes and needs to grasp several key problems; the fourth part on how to grasp the implementation of the two regulations of the party. < code > and < Regulations > revised the necessity and revised history of the CPC Central Committee the amendment to the Chinese Communist Party members and leading cadres honest politics several guidelines > and < Chinese Communist Party discipline and Punishment Regulations > column 1 by 2015 to strengthen party laws and regulations focus. Two party regulations revision work lasted a Years, pooling the wisdom of the whole party, ideological consensus, draw historical experience, respect for the wisdom of our predecessors, which reflects the unity of inheritance and innovation; follow the correct direction, grasp the limited goals, adhere to the party's leadership, to solve the masses of the people reflect a focus on the problem. The new revision of the < code > and < rule >, reflects the party's 18 and the eighth session of the third, the spirit of the fourth plenary session, reflecting the experience of studying and implementing the General Secretary Xi Jinping series of important speech, reflects the party's eighteen years comprehensive strictly practice. (a) revised two regulations of the party need of < the ICAC guidelines > in < in 1997 Leaders as members of the Communist Party of China clean politics certain criteria (Trial) > based on revised, the promulgation and implementation of January 2010, to strengthen the construction of the contingent of leading cadres play an important role. But with the party to manage the party strictly administering the deepening, has not been able to fully meet the actual needs. Content is too complicated, "eight prohibition, 52 are not allowed to" hard to remember, and also difficult to put into practice; the second is concisely positive advocated by the lack of prohibited provisions excessive, no autonomy requirements; the third is banned terms and discipline law, both with the party discipline, disciplinary regulations repeat and Criminal law and other laws and regulations repeat; the fourth is to "clean" the theme is not prominent, not for the existing problems, and is narrow, only needle of county-level leading cadres above. < rule > is in 1997 < Chinese Communist Party disciplinary cases (Trial) > based on revision, in December 2003 the promulgation and implementation, to strengthen the construction of the party play very important role. Along with the development of the situation, which many provisions have been unable to fully meet the comprehensive strictly administering the practice needs. One is Ji law, more than half of the provisions and criminal law and other countries laws and regulations Repetition; two is the political discipline regulations is not prominent, not specific, for violation of the party constitution, damage the authority of Party Constitution of misconduct lack necessary and serious responsibility to pursue; third is the main discipline for the leading cadres, does not cover all Party members. Based on the above situation, need to < the criterion of a clean and honest administration > and < rule > the two is likely to be more relevant regulations first amendment. By revising, really put the authority of Party discipline, the seriousness in the party tree and call up the majority of Party members and cadres of the party constitution of party compasses party consciousness. (II) two party regulations revision process the Central Committee of the Communist Party of China attaches great importance to two regulations revision . Xi Jinping, general books recorded in the Fifth Plenary Session of the eighth session of the Central Commission for Discipline Inspection, on the revised regulations < > made clear instructions. According to the central deployment, the Central Commission for Discipline Inspection from 2014 under six months begin study two regulations revision. The Standing Committee of the Central Commission for Discipline Inspection 4 review revised. Comrade Wang Qishan 14 times held a special meeting to study two regulations revision, amendment clarifies the direction, major issues of principle, path and target, respectively held a forum will listen to part of the province (area) secretary of the Party committee, Secretary of the Discipline Inspection Commission, part of the central ministries and state organs Department The first party committee is mainly responsible for people, views of experts and scholars and grassroots party organizations and Party members. Approved by the Central Committee of the Communist Party of China, on 7 September 2015, the general office of the Central Committee of the Party issued a notice to solicit the provinces (autonomous regions, municipalities) Party, the central ministries and commissions, state ministries and commissions of the Party (party), the General Political Department of the military, every 3 people organization of Party of two regulations revision opinion. Central Commission for Discipline Inspection of extensive solicitation of opinions, careful study, attracting, formed a revised sent reviewers. In October 8 and October 12, Central Committee Political Bureau Standing Committee and the Political Bureau of the Central Committee After consideration of the two regulations revised draft. On October 18, the Central Committee of the Communist Party of China formally issued two regulations. Can say, two laws amendment concentrated the wisdom of the whole party, embodies the party. Second, < code > and < Regulations > revision of the basic principles of two party regulations revision work and implement the party's eighteen, ten eight plenary, the spirit of the Fourth Plenary Session of the Eleventh Central Committee and General Secretary Xi Jinping important instructions on the revised < low political criterion > and < Regulations >, highlighting the ruling party characteristics, serious discipline, the discipline quite in front of the law, based on the current, a long-term, advance as a whole, with Bu Xiuding independent < rule > and < rule >. Main principle is: first, adhere to the party constitution to follow. The constitution about discipline and self-discipline required specific, awaken the party constitution of party compasses party consciousness, maintaining the authority of the constitution. General Secretary Xi Jinping pointed out that "no rules, no side round. Party constitution is the fundamental law, the party must follow the general rules. In early 2015 held the eighth session of the Central Commission for Discipline Inspection Fifth Plenary Session of the 16th Central Committee, Xi Jinping again pointed out that constitution is the party must follow the general rules, but also the general rules." the revision of the < code > and < rule > is Method in adhere to the regulations established for the purpose of combining rule of virtue is to adhere to the party constitution as a fundamental to follow, the constitution authority set up, wake up the party constitution and party rules the sense of discipline, the party constitution about discipline and self-discipline specific requirements. 4 second is to adhere to in accordance with the regulations governing the party and the party. The Party of rule of virtue "de", mainly refers to the party's ideals and beliefs, excellent traditional style. The revised the < code > closely linked to the "self-discipline", insisting on the positive initiative, for all members, highlight the "vital few", emphasized self-discipline, focusing on the morality, and the majority of Party members and the ideological and moral standards. The revised < > Ji method separately, Ji, Ji Yan to Method, as a "negative list", emphasizing the heteronomy, focusing on vertical g