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    《炎汝高速21标预制T梁施工方案)》.doc

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    《炎汝高速21标预制T梁施工方案)》.doc

    湖南省炎汝高速公路第21合同段胜利高架桥T梁预制及安装开工报告业主单位:湖南省炎汝高速公路建设开发有限公司监理单位:湖南省和天工程项目管理有限公司施工单位:湖南省邵阳公路桥梁建设有限责任公司二0一一年五月十日目 录1、分项工程开工申请批复单2、T梁预制及安装施工方案3、梁场平面布置图4、预应张拉力及伸长量计算表5、混凝土配合比审批单6、T梁施工技术及安全交底SJ02湖南省炎陵至汝城高速公路工程分项开工申请批复单承包单位:邵阳公路桥梁建设有限公司 合同号:21监理单位:湖南和天工程项目管理有限公司 编 号:致(监理工程师): 下列工程项目的准备工作已经完成,现申请开工,请批准。 上一步 下部构造 工程经检验合格,现申请下列后继工程项目开工,请批准。工程项目: 胜利高架桥上部构造预制及安装 桩号: K90+990 计划开工日期: 2011.5.20 计划完工日期: 2012.5.20 工期: 360 天此项工程负责人姓名: 龚晓辉 附件:试验资料 承包人(或承包人代表)签名: 年 月 日监理员意见:试验专监意见:签名: 年 月 日签名: 年 月 日安全专监意见:环保专监意见:签名: 年 月 日签名: 年 月 日 审定 转报 具备开工条件,以驻地监理工程师的批复为准。 具备开工条件,最终批准该项工程于 年 月 日开工。 不具备开工条件,暂时不能开工,意见如下: 专业监理工程师: 年 月 日 批准该项工程于 年 月 日开工。 不具备开工条件,意见如下:驻地监理工程师: 年 月 日胜利高架桥预制T梁施工方案一、编制施工方案的依据及原则1.1 编制依据(1)<<胜利高架桥建设工程施工招标文件>>(2)<<胜利高架桥建设工程两阶段施工图设计>>(3)交通部现行的<<公路桥涵施工技术规范>>和<<公路工程质量检验评定标准>>(4)本工程所在地地形、地貌、水文、地质、气候、材料供应、土地使用、供水、供电的初步调查。1.2 编制原则(1)在充分理解招标文件的基础上,根据本合同段工程特点,采用先进、合理、经济、可行的施工方案。(2)采用先进的施工设备和施工技术,确保质量和工期目标。(3)充分考虑不良气候等不可预见因素对工程的影响,施工进度安排合理、高效,施工区段划分协调、统一。(4)拟订的施工方案与施工规范及设计要求相符,有可靠的安全保证措施。(5)整个工程施工全过程对环境破坏最小、占用场地最少,并有较周密的环境保护措施。(6)综合考虑现况道路及周围居民生活环境,最大限度降低对周围居民生活的干扰,做到文明施工。Opinions and suggestions on the party's mass line educational practiceAccording to the central and provincial, municipal unified deployment, according to municipal Party committee "about carrying out the party's mass line educational practice activity in the city's implementation opinions, the spirit of the party's mass line educational practice activities from 20* in January 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 county 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 really, 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 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 waste 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, hedonism 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 pragmatic 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 of 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 unit, 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, educational 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 party's education.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 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 partial, not as a mere formality.Two, the key point of the taskThe main task of the county's 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 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 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 issuesThe 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 county. 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 difficult, 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.(three) 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 brand, 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, effective 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 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 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 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 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, financial investment policy, financial policy and tax policy, and actively seek policy, projects and funds, enterprise and industry group mission to promote leapfrog development.41二、施工方案、方法及其措施2.1、 预制场地布置及台座设置2.1.1预制场地布置T梁预制场包含以下设施:预制台座、存梁区、水电线路、提梁龙门行吊及轨道、排水沟管、模板机具存放区、钢筋预应力钢材加工区等。由于本合同受到地形限制,加之考虑到T梁运输线路设置的难度及运距对T梁安装工期的影响,拟在填方路基上,平行于桥位轴线设置预制场;在预制区后方设置T梁钢筋加工区;预制场四周设置排水沟。为了确保工程进度,预制场设置预制台座三排,共计台座12个。2.1.2 预制台座施工T梁台座基础采用扩大深埋基础。修建前根据预制场平面布置图的设计位置,进行挖槽,两端部相应放大以提高承载力,基底浇筑C25号砼,在台座砼中沿台座纵向铺设一定数量的钢筋网,以确保其整体结构强度,尤其是端头台座纵向增加4根25mm的螺纹钢筋。在台座砼浇筑时必须注意预设端头梁体吊装槽,并保证尺寸准确,使梁体吊装用的捆绑绳能顺利穿过。由于T梁在预应力张拉作用下会产生变形,最终会影响成桥标高、桥面系结构厚度和桥面铺装、防撞栏施工及最终成桥桥型,因此,在施工时应根据设计单位提供的反拱值并结合以往经验将台座制成反拱,反拱以抛物线形式设置。在整个施工过程中,应严格控制砼的质量,选择优质河砂、碎石及水泥等原材料,减小徐变;其次应严格按照设计张拉力和张拉工艺施加预应力。台座底模采用角钢骨架加钢面板制作,角钢钢骨架预埋在台座砼中,便用水准仪精确测量整平其顶标高;其顶面标高应与设计反拱值相符,台座砼强度满足施工要求后,将钢面板铺设在角钢骨架上、调整板面顺直度和反拱曲线后与角钢骨架进行焊接;板面接缝焊平磨光,最后在底模两侧粘贴上高弹橡胶条。底模加工应注意以下要点:a.T梁采用兜底捆绑吊装施工,T梁吊索孔处的底模应设为活动板,活动底模与两端底模接缝可采用粘帖胶带纸的方法止浆。b.兜底位置应按设计要求的距离梁端80cm布设,梁体两翼砼浇筑时,在与兜底位置同一竖直断面预留吊装孔,以便吊装钢绳垂直受力。c.台座两端底模须承受全部梁重,因此台座两端基础必须加强处理,基坑要加大面积和深度开挖,并在基础砼中布设23层钢筋网,使其有足够的承载力。d.台座高度设置:根据T梁模板底部支撑情况,为了便于模板安拆,要求台座比地面高出30cm,并在台座中根据模板的对拉孔设计位置相应预埋对拉杆预埋管道。在预制台座及存梁台座制作完成后,整个预制场应用10cm厚的C25号砼封面,四周布设排水沟,以利场内施工用水的排放。T梁预制场的布置及台座结构详见预制场平面布置图。2.2 T梁预制2.2.1 T梁模板a.模板加工T梁模板共备2套,可同时应用于中梁和边梁。为了提高T梁砼外观质量,T梁模板采用5mm厚的钢板辅以槽钢支架组成的大块分段整体定型钢模。模板具有足够的强度、刚度和稳定性,能可靠地承受模板周转、砼浇筑等过程中产生的各种荷载,以保证T梁各部分形状、尺寸准确;板面平整光洁,接缝严密不漏浆,拆装容易,施工操作方便、安全等特点。模板加工时应注意以下要点:>用材尽量选用新出厂或保存较好的钢材,尤其是板面应采用无浮锈和氧化膜脱落的新近出厂的钢板,钢板不应有硬伤和变形,型钢不得翘曲。>模板面板配料尽量减少拼缝,园弧尽量在大块钢板上卷压,如弧型板与平板焊接则必须保证相切。>与板面相贴的型钢,必须经过校验顺直后方可使用,尤其是设在模板接缝处槽钢,宜用3m压尺检验平整度、顺直度。>螺栓孔及模板接缝处尺寸平整度应当高于规范要求,横隔板及马蹄处板面不得有凸凹现象。>每块模板加工完后,要与其相临模板试拼,校验其接缝和加工精度情况,接缝的错台和整体平整度必须严格控制在规范误差范围之内。>模板加工好后,要进行编号,避免施工时出现模板不匹配而产生接缝较大的错位和错台现象。>模板使用前根据存放时间长短选择防锈方法,时间短可用涂油法,时间长应涂白乳胶。>模板使用前有少许浮锈,尽量采用手工砂纸打磨,用汽油清洗打磨只须达到无锈即可,切勿将钢板表面的氧化膜剥落,模板锈如非特别严重,尽量不用磨光机打磨,因为磨光机打磨除锈虽快,但在其磨擦过程中产生的高温下又会使钢板表面迅速氧化成Fe3O4,并会随时间增长进一步氧化为Fe2O3也就是我们常见的磨光机磨光后板面又黑又光,当时擦洗干净后,用白纸或白布擦抹也不会染色,但是等到浇筑完梁脱模后又会出现或黑或红的斑痕,一旦出现这种情况,宜先将锈蚀磨光并清洗干净,然后用水泥砂浆抹在板面上,待水泥砂浆硬化并有一定强度后将其敲掉,用砂浆将浮锈粘掉,随后再局部抹砂浆检验浮锈是否已清完,此办法虽工作量较大但较为可靠。模板脱模剂拟由当地市场购买,模板初次使用可在脱模剂中掺如适量滑石粉,其一可利于脱模,其二便于洗刷梁面的锈迹。b.模板安拆模板安装采用预制场龙门吊进行起吊,采用扁担梁起吊吊点设两个,吊点设计应确保起吊钢丝绳的合力与模板重心重合,起吊后侧板面与地面垂直,顶板保持水平以方便工人操作。模板底脚支撑的地面应当进行硬化处理,以确保施工时不沉降,模板的对口拉杆间距根据加劲桁片间距设置,常规下取拉杆间距为5080cm,下口取用22mm的拉杆,上口取用16mm的拉杆;拉杆设计安装时应上下口都采用双螺母,以免滑丝胀模。模板安装拼缝间夹垫橡胶泡沫,橡胶泡沫条应在模板安装前粘贴在模板上。接缝缝口在模板拼装好后,须仔细检查,尤其是边梁模板,在拼装好后在模板后和模板顶口,用眼观察接缝有无过宽或错台,发现问题及时校正。模板初安后,着重检查六个方面,一是梁长,二是板和肋板宽度,三是横隔板定位准确性,四是顶板水平和侧板垂直度,五是梁的纵轴线是否弯斜偏曲,六是模板预拱度是否与台座所设的预拱度吻合。在每个台座的四个角设置四根标志杆,标志杆用全站仪定位,水准仪抄平,模板检查在标志杆上拉线即可。在模板外侧投影处每隔7m设一个基准点检查模板高程。模板安装应在绑扎顶板钢筋前进行一次初调,顶板钢筋绑扎完成后再进行精调。模板拆除梁体砼强度宜在25 MPa左右(砼强度达到30 MPa以上,脱模难度较大> ,大块模板脱模前应将拉杆取掉,拆除横隔板的堵头板,大块模板拆除采用小龙门吊和手拉葫芦配合进行,将模板底支撑的螺旋支脚松开5cm左右,用24个葫芦同时外拉,拉时应两边对称用力,避免模板受力不均发生变形。2.2.2 钢筋绑扎在钢筋施工方面,根据经过审核、校对的正确施工图纸,编制配料单,并根据配料单进行钢筋下料、制作。在钢筋棚设置调直机一台,用于加工盘圆钢筋。T梁为预应力梁,按照设计图纸要求至少每1米需设定位钢筋对预埋波纹管进行精确定位,确保预埋管道位置的准确和顺直度。在每片T梁模板拼装前,检查已加工好的钢筋规格、形状、数量是否正确,有无错配或漏配的钢筋,发现问题及时更正。T梁钢筋采取在加工棚加工、现场安装的方式施工,钢筋骨架安装时用支撑钢筋焊在骨架上进行固定,并注意主筋位置的控制。另外每个定位网应与骨架牢牢焊接,以保证预埋波纹管道位置的准确和预应力管道的线型顺直。为保证横隔板位置准确,在底模处的横隔板中心线确定横隔板位置,横隔板钢筋应与T梁骨架筋牢固焊接,以免模板拼装时位置发生变化。由于T梁在两端张拉,所以梁端的加密筋和弹簧筋也应注意,待加密筋绑扎完毕后,应先将弹簧筋放入骨架内,待端模安装后,再将弹簧筋与锚垫板牢牢固定在一起。为了保证T梁钢筋保护层厚度,垫上购置的成型垫块,其中梁肋部分的垫块按侧面每1m2设一块,以保证保护层厚度。2.2.3 预应力管道安装及钢绞线下料、穿束a.将已加工好并且经过检查的波纹管分段依次穿过各定位筋,接头处用接头管道连接,并用胶布粘结,接头长度4050cm。待全部波纹管穿好以后,对已穿好的波纹管进行逐根检查,如发现波纹管有破损应及时补救,波纹管之间的接头管也要重点检查,然后在波纹管内穿入胶管芯棒,防止波纹管在砼浇筑时出现前变形。另外在混凝土浇筑时应注意振动棒不能碰到预应力管道,振捣后振动棒也应缓缓提出,避免造成对波纹管的损害。b.T梁砼浇筑成型后,将钢绞线按设计长度下料,并且用梳型板将钢绞线从一端向另一端梳理顺直,钢绞线穿束时应注意在孔道内保持顺直状态,不能扭转和交叉扭结。制好的钢绞线应先检查其绑扎是否牢固,有无绞丝现象,并核对钢绞线束长是否符合要求。如符合规定,则抽出波纹管内的胶管芯棒,然后进行穿束,钢绞线从一端向另一端穿入,穿好后钢绞线在孔道两头的伸出长度应按设计预留60cm(张拉工作长度)对称布设 。2.2.4 T梁混凝土浇筑a.砼的配制I) 砼的配制应满足设计需要的强度和耐久性,具有良好的施工和易性和适宜的坍落度。砼在拌和站拌出时,试验室要做重点检验。II) T梁构件虽然在腹板马蹄位置及端头部位钢筋布置较密,但在构件截面尺寸和配筋允许下,尽量采用合理粒径,强度高,级配良好的骨料,配合比设计中水泥不宜超过500kg/m3,水灰比不宜超过0.45,坍落度一般宜为79cm。III)T梁预应力砼所用的一切材料,必须在进场前进行全面检查,各项指标均应满足现行规范及设计要求,不合格的材料坚决不允许进场。b.砼运输考虑到拌和站位置距离预制场不远,根据施工要求,选用砼运输罐车运料。在砼的运输过程中,应保证砼的匀质性,不离析、不漏浆、不分层,而且运至浇筑地点后,应保证配合比设计规定的坍落度。c.砼浇筑砼浇筑采用起吊设备提升料斗入模的方法浇筑,根据我单位的施工经验,并结合实际现场情况,因地制宜的采用龙门提升料斗浇筑。I) 设备、人员要求T梁砼浇筑所需设备除运输设备外,砼浇筑时还需配备插入式振动器和附着式振动器。附着式振动器又分普通附着振动器和高频式附着式振动器,高频式振动器具有激振频率高、振幅小,安装拆除方便,易于更换,使用寿命长等优点,已被T(箱) 梁预制施工中广泛采用,本合同段T梁预制施工也采用高频式振动器振捣。人员要求:根据以往施工经验,浇筑一片T梁需要人员1015人(不包括砼拌和站工作人员)。II> 施工准备首次混凝土浇筑前必须对各级人员要进行技术、质量、安全工作交底。每次砼浇筑前,要对机具设备进行检查和试运转,保证拌和站、砼罐车、龙门吊、振动器等机具设备使用前的完好率、施工过程中的正常工作,保证水电及原材料的供应;考虑到机具如发生故障,需要时间修理,必须配备备用设备(如振动器、吊车、发电机等) ,同时应配备专职技工跟班作业,随时检修。III> 浇筑顺序预应力T梁砼的浇筑顺序(即投料顺序> 对砼成品的质量至关重要,如果投料顺序不正确,极易出现漏振、振捣不密实等现象。拟采用斜层法浇筑:浇筑的方向是从梁的一端循序进展至另一端,在浇筑到距离另一端端头56米时,为避免梁端砼产生蜂窝等不密实现象,应改从另一端向相反方向投料,浇筑合拢。采用该方法浇筑时,可以一气呵成,连续浇筑,保证砼密实、无漏振,拆模后外观较为美观。IV> 砼的振捣砼的振捣是控制预制T梁成品质量至关重要的一环,除投入熟练的砼振捣工人外,还必须制定得当的振捣方式,本合同段T梁预制拟采用高频式附着振动器和插入式振捣器联合振捣的方式,以确保砼振捣密实。> 插入式振捣器的操作 T梁砼浇筑时,插入式振捣器要做到“快插慢拔”,沿腹板振捣时一般以T梁纵向间隔3040cm一个插点。每一插点要掌握好振捣时间,如果时间过短,不易振捣密实,时间过长可能引起砼产生离析现象,一般每点振捣时间为1030秒,不能少于10秒,同时要使砼表面泛浆、不出气泡、不显著下沉为止。 使用插入式振动器时,不能紧贴模板振动,同时,振动棒插入的深度不得触击到波纹管,以免造成管道脱节、位移、弯曲或出现局部凹陷,造成孔道堵塞现象,同时,振动棒也尽量避免碰撞钢筋及预埋件等。> 附着式振动器的操作 附着式振动器的操作一般均应按厂家的出厂使用说明来操作。目前,广泛采用的变频式高频振动

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