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1、互通区EK0+167.951第一联预应力混凝土连续箱梁现浇施工方案第一节 编制依据及范围一、编制依据1、互通区E匝道EK0+167.951大桥设计图纸。2、进场后现场调查所得的有关资料。3、交通部颁发的公路工程国内招标文件范本（2003年版），陕西高速公路投资有限公司下发的招标文件专用本。4、国家或交通部现行公路工程施工技术规范、验标等。5、我单位拥有的技术水平、机械设备能力和同类工程的施工经验。二、编制范围*高速公路第九合同段互通区E匝道EK0+167.951大桥预应力混凝土现浇梁工程，以及为完成本工程所需的临时工程，直至该工程达到交通部及招标文件中明确的有关公路工程验收评定标准为止的全过程
2、。第二节工程概况互通区E匝道EK0+167.951大桥第一联设计为18+24+18+18米预应力混凝土现浇箱梁；全幅梁底宽12米，梁顶宽15.5米，梁高1.2米；主要工程量有：C40混凝土717方，钢筋114.337吨，钢绞线23.448吨，波纹管1120.5m；该连续梁上跨高速公路主线，梁底距高速公路主线高度5.5米。第三节施工组织计划一、工期根据总体工期和目前桩基完成情况，计划现浇箱梁的施工日期为2006年5月15日2006年7月15日。二、施工准备1、人员设备上场2006年5月10日前所有施工人员和机械设备全部到位。施工人员配置计划见“施工人员配备计划表”。机械设备配置计划见“机械设备配
3、备计划表”。施工人员配备计划表工班组别班长班组人数到场时间钢筋工班452006.2.20模板工班302006.2.20架子工班302006.2.20混凝土工班82006.2.20张拉工班62006.2.20机械设备配备计划表机械设备名称数量规格型号到场时间电焊机422KW2005.9.1钢筋调直机14.5KW2005.9.1钢筋切割机14.5KW2005.9.1钢筋弯曲机14.5KW2005.9.1吊车116T2006.2.20混凝土输送泵2HB302006.4.30混凝土运输车56m32005.9.3搅拌站1JZS15002005.9.5搅拌站1JZS7502005.9.5插入式振动棒81.
4、5KW2005.9.1平板振动器21.5KW2006.4.30木工多用机床2MQ4332006.2.20砂轮切割机1SEG2-A2005.9.1液压式张拉机2YCQ150Q（1000KN）2006.7.1真空泵、压浆机、油表160Mpa准确度等级1.62006.7.1水泥搅拌机11.5KW2006.4.30手动卷扬机23T2006.4.30发电机组1150KW2006.4.302、技术准备2006年5月10日前完成混凝土配合比、钢筋、钢绞线、锚具、支座等原材料试验。2006年7月3日前完成张拉、压浆机具的校核试验。2006年6月15日前完成施工方案的编制和支架及模板的检算。相应立柱及盖梁施工完
5、毕后立即进行施工测量放样。3、物资准备根据工序，现场施工所需物资计划见“物资计划表”物资计划表材料名称规格型号单位数量到场时间钢管483mmT341.1320060520扣件个72090竹夹板12mmm22418方木m362.37编织袋个5000钢筋22Kg25785201210116486231226259波纹管内100mmm1121锚具OVM15-19套28钢绞线s15.20Kg23448支座GJZF4400650107块6GYZ90020794、施工总体思路现浇梁施工采用满堂钢管支架；底模侧模采用镜面竹夹板，内模采用普通竹夹板；混凝土集中拌和，砼罐车运至现场，砼输送泵泵入模内；先浇注底板
6、和腹板下梗肋，再浇注腹板、顶板；接缝按规范要求凿毛，并且在冲洗干净后方可进行后续施工，张拉采用双向对称一次性张拉。第四节钢筋混凝土连续箱梁现浇施工工艺现浇箱梁的施工程序为：支架基础处理支架搭设安装底模支架预压测量放样底板及部分腹板钢筋绑扎安装支座测量复核底板灌注砼腹板钢筋绑扎穿钢绞线预应力管道安装安装内模顶板钢筋绑扎测量复核灌注腹板和顶板砼养护拆除内外模及支座周围模板张拉、压浆、封端拆除支架和底模。现浇箱梁施工工艺见“现浇连续箱梁施工工艺流程图”，施工要点如下：（一）地基处理平整桥下场地，用压路机将基底碾压密实，使其密实度满足设计要求，支架基础采用22cm厚木枕基础，按支架立杆间距布置，同时注
7、意做好场地四周的排水系统，防止基底积水。（二）拼装满堂支架支架采用钢管式扣件脚手架，支架底板与梁端位置按照6070cm布置（在大、小分配梁和腹板位置加密成3070cm），翼缘板部位按照8070cm布置，并且斜向用钢管支撑。脚手架加长连接采用双向错接，接长部分保证有1.5m，用两排以上的扣件相连以保证搭接不发生滑移。在顶横杆下的立杆上设置双排扣件以防顶横杆承重下滑。水平横杆按照120cm竖向布置，纵向每4m在横断面设连续剪力撑，两侧面及端面分别设置剪力撑，与水平杆成450夹角。大分配梁采用2根483.0mm扣件式钢管，间距为30cm，小分配梁采用1根483.0mm扣件式钢管。详见图“满堂支架现浇
8、连续箱梁支架示意图”。计算过程详见附件2“连续箱梁现浇支架设计方案及力学检算”（三）支架预压为了检验地基的承载力及支架的稳定性，在支架搭设完成、铺完底模后，用与梁体等重的砂袋对支架进行预压，预压荷载达到箱梁自重的115%，以消除模板、支架、地基的非弹性变形，持荷时间不少于48小时，预压完成后再通过调整脚手架，使模板下横木（钢管）达到设计高度，并且考虑在跨中预留2cm的预拱度，再进行下步工序施工。预压时从第3跨开始，逐次向2、4、1跨进行。预压期间在支架上设置观测点，每断面设置9个观测点，分别设置在翼缘板、腹板和各箱室跨中处。用全站仪观测支架的沉降量、塑性变形、弹性变形。水平位移的控制采用从支架
9、顶吊铅丝垂球，监测支架的水平位移，发现位移过大时立即停止加载，检查支架，分析原因，加固处理，或卸载停工。加载后每天观测一次，直到72小时累计下沉量小于1.0mm。卸载后再次测量标高。根据加载前和卸载后的标高计算支架包括地基的弹性变形，并以此设置预拱度。（四）钢筋制作及安装钢筋严格按照图纸尺寸及施工规范进行下料、弯制，加工成型的钢筋要分类堆放，同时挂牌标明，防止用错，同时采用架空、覆盖等措施防止钢筋锈蚀。主筋采用双面搭接焊，若只能在梁上焊接的，采用单面焊，焊缝长度10d。钢筋严格按图纸设计的尺寸和位置进行安装。钢筋安装时，接头应尽量错开，同排钢筋接头数量符合规范要求，同时在跨中部位及墩顶尽可能不
10、布置接头。由于箱梁内钢筋数量大且较密，安装时应注意安装顺序。先安装横梁钢筋，再安装纵梁钢筋及底板钢筋网。在浇注底板之前一次性把全部底板和部分腹板钢筋，在浇注腹板和顶板混凝土之前完成所有剩余钢筋的绑扎。钢筋安装完毕经检查确认无误后，应进行必要的加固，防止在砼浇注过程中变形或出现露筋现象。钢筋施工中在施工前先进行在模板上打点定位的方式将每根钢筋的位置放设出来 ，在施工时进行挂线绑扎以保证钢筋顺直。（五）模板底模及边模采用优质镜面竹夹板，厚度12mm，长2.44m，宽1.22m；内模用普通竹夹板配以木模；端模用定型钢模板，封端模板用大块组合钢模或竹夹板。待预压完成，卸掉砂袋，将横垫木调至正确的标高后
11、。底模下横木间距不超过20cm，以保证底模不致因为受压和浇注混凝土时吸湿软化下挠变形，在每块模板的中部及两端各垫以100*50mm方木，以便将模板以铁钉固定连接，模板缝用（环氧树脂+乙二胺+水）拌和物填实抹平，确保不错台不漏浆。模板铺设按由外向里铺设，完成后重新调整底模标高。支座处的模板采用模板开孔的方式布设模板。内模及端模待底板及腹板钢筋绑扎完毕，预应力束孔道布置完成后进行，箱室内模端头事先用木板及方木加工成型，其它部分按设计尺寸用钢管脚手架现场组拼固定，达到设计要求后再在梁上拼装。组拼加固方案见下图。 翼缘板底模和外侧模加固方式采用用方木夹衬，外用斜向钢管支撑。内模加固采用钢管组成骨架，顶
12、住垫木，腹板内用25钢筋进行内撑。使整个现浇梁的内外模形成一个整体骨架，保证了模板不变形跑模。（六）波纹管及钢铰线加工、安装波纹管的长度一般加工成1020m一节，同时还应加工长30cm、直径比波纹管长5mm的套管，用于波纹管的连接，接头处用胶带把接头缠牢，防止水泥浆进入堵塞孔道。钢铰线进场后要采取防锈措施，下料时要考虑两端千斤顶的工作长度。切割时用扎丝绑住两侧，然后用切割机切割，任何时候严禁用电焊或气割切断钢铰线。由于箱梁较长，钢铰线弯点较多，穿束时比较困难，在没有穿束机的情况下采取先穿钢铰线后穿波纹管的方法：先将钢铰线穿入腹板箍筋内并编好束，用定位筋将其定在设计位置，再将波纹管分别从两端套入
13、钢绞线（接头管应事先套在波纹管头部一同套入）。钢铰线穿好后，要仔细检查波纹管，如发现有裂口或小洞，先用海绵堵住，再用胶带缠牢。（七）混凝土浇注为保证工程质量，箱梁采取两次浇注，即先浇筑底板，再浇注腹板和顶板，施工缝留在底板与腹板交接处。采用泵送砼，由4#墩向0#台方向浇注。由于一次性浇筑的砼量较大，且需要连续作业，因此准备工作相当重要，不可疏忽大意。准备工作主要从以下几个方面进行检查：1、原材料：用于本工程的原材料必须按技术规范的要求进行抽查，不合格的材料不能进场。原材料的数量要满足混凝土的要求，不能出现缺料现象。箱梁底板砼281m3，顶板及腹板砼436m3，按此方量根据配合比备足水泥、砂、碎
14、石及外加剂。2、设备：一是进场的设备数量是否满足要求（按设备表进行清点）；二是对砼拌和设备、砼输送泵、发电机等，在浇注前必须进行试运转，以防在浇筑过程中发生故障。此外还应对备用机械、振捣设备等进行全面的检查，确保满足需要。3、对支架进行检查：检查支架下垫板是否与地面充分接触，上、下托是否与垫板龙骨顶紧，发现问题及时处理，检查各杆件是否横平竖直，间距是否符合要求。4、模板的检查：检查模板是否具有足够的强度、刚度和稳定性；检查接缝是否漏浆，大面是否平整，有无错台现象；对于用于腹板的模板，要严格检查尺寸以及牢固状况，防止变形、跑模影响质量。5、钢筋的检查：除对钢筋的数量、位置进行再次检查外，着重检查
15、钢筋表面是否洁净，无油渍、漆皮和鳞锈，保护层的厚度是否满足要求，有无露筋的现象。6、预埋件再进行一次全面检查，有无错位、漏埋现象。7、混凝土浇注施工顺序：根据砼初凝时间将箱梁分若干单元浇筑，从4#墩向0#台逐次推进，每单元浇筑采用先底板后腹板的浇筑顺序。8、天窗位置留在每一个箱室的1/4位置处，并且将每垮的三个天窗错开分布。天窗的尺寸为0.80.7m。待腹板面板混凝土施工，内模拆除后，将面板的钢筋接齐，用掺入铝粉的微膨胀C50混凝土浇注补齐，并加强养护。Opinions and suggestions on the partys mass line educational practiceAc
16、cording to the central and provincial, municipal unified deployment, 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 Janua
17、ry to 99 months, carried out at all levels of departments and 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 co
18、unty education practice to the eighteen Party of eight, the spirit 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 reall
19、y, opinions and advice , party implementing the guiding ideology 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
20、carrying forward the spirit of Zhuanglang Zhuang, improve their 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 was
21、te regulations , double section provincial regulations, municipal 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, hedo
22、nism and wasteful extravagance to solve the problems, Party members 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 pragmati
23、c people honest image to further establish the foundation to 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 o
24、f the unit is mainly: the county and below county departments 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 un
25、it, follow the rules on internal institutions. Educational practice 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, educa
26、tional practice, pay attention to grasp the heavy towns, streets 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
27、.Always speak seriously as a basic attitude, adhere to positive 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
28、 to open the door, the participation of the masses, pay more 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 pa
29、rtial, not as a mere formality.Two, the key point of the taskThe 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, scal
30、e behavior to a large scale investigation, overhaul, cleaning 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
31、lazy luxury, extravagance and waste fees, privileges and other 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 iss
32、uesThe central and provincial requirements, the county leadership 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 cou
33、nty. The units directly under the heavy focus on solving Yung lazy drag, buck passing skin, work is not implemented, the service is not active. The dynamic problem of law enforcement and supervision departments and window units, service industry mainly solve the door hard, ugly face, something diffi
34、cult, and arbitrary charges, fines, levies, and breach of privilege, chinakayao, not the problem of law. The township, street The collar of leading bodies and leading cadres to solve key does nottheir own conditions to develop the correct road, the maximum to avoid investment risk, gain profit.(thre
35、e) vigorously promote the brand. To establish brand awareness, awareness of the use of brand, brand value, brand acquisition performance, enhance the competitive strength. Concentrated manpower, careful planning, packaging and publicity of a number of unique, market influence and coverage of the bra
36、nd, the implementation of key breakthroughs, to enhance the competitive strength, walking business road the competition of alienation and characteristics, the pursuit of stability and development of the market.(four) to promote the integration of resources. To further broaden their horizons, effecti
37、ve integration of resources within the group, the city resources, other industries and regional resources, mutual trust, mutual benefit, seeking win-win principle, in the framework of national policies and regulations, strict inspection and argumentation, legal consultation, examination and approval
38、 procedures, strict regulation of economic activities, attract injection the social investment to the industry group, to achieve leveraging the development, ensure that the value of state-owned assets.(five) to strengthen the construction management personnel. Strengthen the management of education
39、and training of cadres and workers of the existing business, firmly establish the concept of the market, enhance the sense of crisis to adapt to market competition, the sense of urgency, improve the ability to respond to market competition, improve management and operation of the market. At the same
40、 time, according to the need of industrial development, vigorously the introduction of high-quality management management personnel, and strive to build a high-quality professional management team, hard work, and promote the entire workforce knowledge structure, age structure, structure optimization
41、 and upgrading ability, enhance core competitiveness, adapt to the need of market competition.(six) seriously study the policy for policy. Serious research about social support the development of cultural undertakings in the country and the XX policy, especially the policy of industrial development,
42、 financial investment policy, financial policy and tax policy, and actively seek policy, projects and funds, enterprise and industry group mission to promote leapfrog development.浇 注 顺 序 图在浇筑过程中着重检查：(1)、混凝土的坍落度是否满足要求。(2)、混凝土的浇注顺序和方法是否满足要求，砼的振捣是否到位。(3)、对支架、模板、钢筋和预埋件的稳固性进行检查。(4)、对砼表面的标高、厚度、平整度进行控制检查。(
43、5)、及时留取强度试块。(6)、由于砼方量较大，又必须连续浇注，人员的组织尤为重要，初步拟定实行二班倒，每班30人，项目部主要负责人跟班作业，确保工程优质、顺利完成。由于砼浇筑时间较长（2天左右），天气的变化对工程的顺利进展影响较大，除积极做好防雨的各项措施外，应选择连续晴天，必须避开大风、大雨等恶劣天气。由于砼施工是正值高温天气，砼要派专人进行养护，砼顶面覆盖麻袋经常浇水保持湿润。底板的厚度通过在底板钢筋上每1.5m焊一根长与底板厚度相等的8钢筋来控制，以确保底板厚度符合设计要求。箱梁顶间标高及平整度的控制与砼桥面铺装的方法相同，沿桥纵向每1.52.0m以16钢筋布设一道标高带，借以控制标高
44、及平整度，砼浇筑完毕不再取出，为防止砼表面出现干缩裂缝，必须掌握好表面收光及拉毛的时间，除在砼振捣完成，提浆完后收光一次外，在砼接近初凝时再收光一次，而后进行拉毛，待砼终凝后即时覆盖养生。现浇箱梁混凝土质量标准项目规定值或允许偏差（mm）混凝土强度符合设计要求轴线偏位10顶面高程10高度+5，-10顶宽30顶底腹板厚+10，0长度+5，-10横坡0.15%平整度8（八）预应力钢绞线施工在施工开始前对所有施工油表进行实验标定，预应力钢绞线布设按设计图纸施工。当梁的砼强度达到设计强度的90%以后，张拉的顺序为N2、N3、N1钢束对称张拉，张拉采用张拉力和引伸量双控，以张拉力为准，伸长量作参考数据。
45、1、预应力钢绞线张拉钢绞线按设计长度下料、编束、绑扎，穿束采用人工进行。当同条件养护下的砼试件强度达到设计强度的90%后，预应力筋即可张拉。张拉前应先清理预应力孔道，并保证压浆孔畅通。2、安装张拉设备。依据张拉顺序，依次安装好工作锚具、工作夹片、限位板、千斤顶、工具锚、工作夹片。梁两端同时先对千斤顶主缸充油，使钢铰线略稍拉紧，同时调整锚环及千斤顶位置，使孔道、锚具和千斤顶三者之轴线互相吻合，注意使每根钢绞线受力均匀，当钢铰线初应力达0.1K时作伸长量标记，并借以观察有无滑丝情况发生。3、张拉采用两端同时逐级加压的方法进行，两端千斤顶的升压速度应接近，张拉力达到K时，持荷2分钟，然后两端缓缓回油
46、，千斤顶油缸回程，自锚式锚夹片自动跟进锚固。4、校核钢铰线张拉时采用双控措施，以引伸量为主。即在低松弛高强钢绞线张拉过程中，除保证设计张拉力要求外，还应实测钢束两端总的伸长量，控制其与理论伸长值之间的误差控制在理论伸长两的6%范围内，如超出误差范围，应放张且查明原因后重新张拉。5、低松驰钢铰线张拉程序0初应力10%K100%K（持荷2min锚固）6、孔道压浆。孔道压浆采用真空吸浆工艺，确保钢绞线被水泥浆包裹严密，防止其锈蚀。（1）真空吸浆原理 首先采用真空泵抽吸预应力孔道中的空气，使孔道达到负压0.1MPa左右的真空度，然后在孔道的另一端再用压浆机以不小于0.7MPa的正压力将水泥浆压入预应力
47、孔道，以提高孔道压浆的饱满度，减少气泡影响 。（2）真空吸浆工艺流程A张拉工序完成。B切断外露的钢绞线，注意保证钢绞线外露量不小于30mm。C清理清洁锚座、盖帽，装“”形橡胶密封圈，然后装盖帽。D装配盖帽，将螺栓加垫片对齐位置旋入螺孔内，旋紧。注意保证排气口要垂直朝正上方。排气口处用G34闷头加密封带旋紧。E在两端锚座上安装压浆管、球阀和快换接头。必须检查并确保所安装阀能安全开启及关闭。F定出抽吸真空端及压浆端。一般情况下，抽吸真空端为置于高处锚座上的压浆孔，压浆端为置于低处锚座上。G在安装完盖帽及设备后拧开排水口，利用高压风将管道可能存在的水分吹出。H将接驳在真空泵负压容器上的三向阀的上端出口用透明喉管连接到抽真空端的快换接头上。I开始真空辅助压浆。启动真空泵，开启出浆端接在驳管上的阀门。关闭入浆端的阀门。抽吸真空使真空度(负压)控制在-0.060.1Mpa之间。J启动压浆机并压出残存在压浆机及喉管的水分、气泡，并检查所排出的水泥浆的稠度。在满意的水泥浆从喉管排出后，暂停压浆机并将压浆喉管通过快换接头接到锚座的压浆快换接头上