《机械成孔灌注桩施工方案》.doc

上传人:本田雅阁 文档编号:2392732 上传时间:2019-03-25 格式:DOC 页数:28 大小:199.01KB
返回 下载 相关 举报
《机械成孔灌注桩施工方案》.doc_第1页
第1页 / 共28页
《机械成孔灌注桩施工方案》.doc_第2页
第2页 / 共28页
《机械成孔灌注桩施工方案》.doc_第3页
第3页 / 共28页
《机械成孔灌注桩施工方案》.doc_第4页
第4页 / 共28页
《机械成孔灌注桩施工方案》.doc_第5页
第5页 / 共28页
点击查看更多>>
资源描述

《《机械成孔灌注桩施工方案》.doc》由会员分享,可在线阅读,更多相关《《机械成孔灌注桩施工方案》.doc(28页珍藏版)》请在三一文库上搜索。

1、中国铝业股份有限公司贵州分公司氧化铝引风机房机械钻孔灌注桩(工程编号:施工方案(安全环保措施)中国建筑第四工程局第二建筑工程公司二OO八年二月二十五日目录、 编制依据第2页、 工程概况第2页、 施工临时用电第3页、 施工现场临时排水、安全卫生管理第3页、 钻孔灌注桩施工及质量技术措施第页、 钻孔灌注桩主要质量控制技术参数标准第2页、 文明施工、安全施工技术要求第3页、 主要施工机械选用及劳动力配备第4页、 保证民工工资发放措施第7页、 环境保护措施第18页、 工程质量保证措施第19页、 标准化管理措施第19页、 安全文明施工措施第1页、 施工平面布置图第25页、 施工进度计划横道图第26页、

2、人员、公司资质证书1.编制依据1.1工程合同1.2昆明有色地质勘察公司提供的地勘察报告1.3贵阳铝镁建筑设计研究院设计,并经过审批的施工图纸。1.4工程所涉及的主要的国家或行业规范、标准、规程、法规、地方标准、法规、图集及国有强制性规定(建筑部分)、图纸会审资料。1.5现场地形地貌、周围环境条件及障碍物情况、水电供应条件、水文、地质、气象等自然条件等。1.6当地建筑市场行情材料供应状况、预制品加工供应能力、劳动力及生产设施条件、交通运输及机械设备供应条件等。1.7我单位的体制、机构、管理模式、技术装备、技术素质、管理水平和施工能力等。2、工程慨况: 21中国铝业股份有限公司贵州分公司氧化铝氧化

3、铝引风机房基础钢筋混凝土钻孔灌注桩工程,位于贵阳市白云区中铝贵州分公司氧化铝厂区内,共设80根桩,中建四局二公司受贵厂项目部委托,接受钻孔灌注桩施工任务,拟投入6台钻孔机械设备进行施工。管理目标:(1)质量目标 达到国家现行质量验收规范。 (2)工期目标满足业主要求,工期控制在20天以内。 22现场场地复杂,A 、B轴高差较大(约4米),桩位处有混凝土路面、浆砌块石基础、乱石层,B轴18线16根桩均在乱石堆积斜的坡处,A轴线2处米处,电除尘车间同时在施工,由于工期短,故没有多的时间平整场地、等待电除尘车间施工完,决定同时采用人工挖孔桩的形式开孔、人工凿穿混凝土路面、块石基础、乱石层,然后由机械

4、钻孔的办法施工,A轴线避免在电除尘车间运土车时同时施工,尽量缩短工期并确保工程达到国家现行质量验收规范。3、现场场地及临时用电、用水31临时用电、用水本工程临时用电总容量约为280KW ,施工临时用电由建设单位提供的引接点到现场,临时施工用电主输电路与各分路需按规范要求架设。4、施工现场临时排水、安全卫生管理41 施工区域畅通的排水系统,满足施工区域的排水及环境保护、安全卫生防预要求。42钢筋笼制作周围进行围护,确保钢筋焊接时的防火防雨。5、钻孔灌注桩施工及质量技术措施51施工工艺流程泥浆沉淀外运安放隔水塞进灌注混凝土钻机移位第二次泥浆清孔砼试块制作安放导管商品砼进场安放钢筋笼钢筋笼制作第一次

5、泥浆清孔测定孔深沉淤淤泥浆循环钻进成孔钻机就位桩位复核埋设护筒 Opinions and suggestions on the partys mass line educational practiceAccording 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 implem

6、entation 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 directly affiliated institutions and grass-roots party organizations. According to my actual County, the county to carry out the educat

7、ion 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 genera

8、l 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 bat

9、h, 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, t

10、o 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, hi

11、ghlight 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 thinki

12、ng 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 count

13、y 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 organiz

14、ations, 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 con

15、tact 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

16、 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 positive education, to carry out criticism and self criticism group, adhere to the pragmatic, more emphasis on leadership, pay more attention

17、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 o

18、n 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 countys education practice is to seize against four wind this focus on centralized solve outstanding problems asked

19、 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 practic

20、al 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 t

21、o 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

22、 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 supervisio

23、n 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 notth

24、eir 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, ca

25、reful 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 o

26、f 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 poli

27、cies 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 ass

28、ets.(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 th

29、e 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,

30、 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 c

31、ultural 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.27质量保证体系组织机构图质量管理目

32、标的规定计算机分析质量信息并反馈质量保证体系控制体系思想体系组织体系TQC活动建立质量责任终身制质量体系培训和质量意识教育施工组织设计与方案控制施工准备的质量控制机具材料的质量控制施工产品的质量控制施工过程的质量控制计量标准的质量控制质检组施工组机修组材料部测量组52桩位处清障成孔前先根据设计图进行桩位放样,然后清除桩位处障碍物。53钻孔支架及施工平台设置成孔施工区域场地经平整后,根据钻机宽度及转移需要铺设300300的方木,形成工作平台。54护筒制作及埋设541护筒制作为确保护筒构造上的坚固耐用,便于安装及拆除且能重复使用,本工程采用钢质护筒、人工挖孔砼护筒,钢护筒由35毫米钢板卷制而成,为

33、增加强度防止变形,在护筒外壁的上下端及中部各焊有角钢制成的法兰,通过螺栓连接整体。在护筒上下端的角钢加强筋,也兼做逐节接长用的法兰接口。所有拼接处均垫35毫米厚的橡胶密封,以防漏水,周围用粘土分层回填夯实。护筒的内径比钻头直径大1520毫米,每节护筒的长度为1.0-1.5米,具体视需要而定。为了吊装方便在钢护筒每节护筒的外侧焊34个吊耳。5.4.2混凝土护筒(人工挖孔混凝土现浇护壁)混凝土现浇护壁(护筒)施工,要先探明桩位下是否有障碍物,机械钻孔是否可行,如遇不易钻的物体(老基础、钢筋砼、块石层等)应人工挖除,并用混凝土现浇护壁,每次护壁深度不能大于1米,护壁顶部标高宜高出地面顶20cm,中心

34、与桩心力求重合,偏差不得大于20mm,并保持垂直。本工程场地复杂,A 、B轴高差较大(约5米),桩位处有混凝土路面、浆砌块石基础、乱石层,B轴18线16根桩均在乱石堆积的斜坡处(堆积的乱石层厚2-5米),A轴线2处米处。因电除尘车间同时在施工,场地不够放机械钻孔设备,应先采用人工挖孔桩的形式开孔,用人工凿穿混凝土路面、块石基础、乱石层,同时做好混凝护壁,使机械钻孔时不从浆砌块石、乱石层处漏浆。人工挖穿以上层面后,再由机械钻孔的办法施工。人工挖浆砌块石、乱石层时采用人绞架提出,倒在距孔口1米外凹底的地方,以便机械钻孔时节省平地面时间。5.5机架安装采用钢结构机架,低座及立杆用槽钢拼接,立杆顶部安

35、装横梁及掉束滑轮,尾部用钢管作斜撑。钻机就位后,必须调整机架垂直,机台水平稳固从而保证钻孔的垂直度。5.6成孔5.7.1本工程采用冲击钻机,钻头直径选用:1000毫米。5.7.2立好钻架并调整和安装好起吊系统,将钻头吊起,徐徐放进人工挖好的孔壁内。5.7.3启动钻机液压系统将底盘钻机顶起,垫方木于底座下面,将钻机整平并对准钻孔。5.7.4装上转杆,使转杆中心同钻架上的起吊滑轮在同一铅锤线上,控制钻杆位置偏差小于2厘米。5.7.5在钻进过程中经常检查转杆,如有倾斜或位移及时纠正。5.7.6在钻杆上端安装提引水龙头,在水龙头上端连接输浆胶管,输浆胶管连接到泥浆泵,把提引水龙头吊挂在起吊系统的滑轮吊

36、钩上。5.7.7先启动泥浆泵和转盘,使之空转一段时间,待泥浆输入孔位中一段时间后,开始钻进。开始钻进时,适当控制进尺,低档慢速钻进,佐刃角处有坚固的泥皮护壁。钻至刃角1米后根据土质情况已正常速度钻进。若护壁土质较软发现漏浆时,提起钻锥,向孔内倒入粘土,再放入钻锥倒转,使胶泥挤入孔壁堵住漏浆空隙,稳定泥浆继续钻进。5.7.8接长钻杆时,先卸下方形套,提升钻杆达到钻头与钻杆连接处外露出钻盘为止。用钻杆卡住钻头,并支撑于转盘,卸去钻杆。然后吊起一节钻杆,连接于钻头,卸去夹持器,把钻杆连同钻头放入孔位内。接着卸钻杆动作迅速、安全,争取短时间内完成,以免停钻时间过长而增加孔低沉淀。5.7.9钻孔过程中,

37、每进尺58米,用圆钢筋笼吊入孔内检查钻孔直径和垂直度。5.7.10钻孔施工期间采用连续作业,每班7人/台,班长兼指挥、记录个1人,司机1人,卷扬机司机1人,泥浆泵机电工1人,装卸钻杆及其它3人。5.8泥浆处理施工现场设置泥浆池,将成孔溢出泥浆用泥浆泵打入泥浆池,待泥浆沉淀后排出清水,沉淀后的泥浆外运。5.9清孔5.9.1清孔使用换浆清孔法,当孔底达到设计标高后,停止进尺,此时稍提锥头离孔底1020厘米空转并保持泥浆正常循环,以中速压入密度为1.101.25的较纯的泥浆,把钻孔内悬浮钻渣较多的泥浆替换出来。5.9.2在下放钢筋笼、导管安装完毕后,再进行第二次清孔。第二次清孔采用抽浆清孔法,清孔时

38、必须注意保持孔内水头高度防止坍孔。5.10刚筋骨架的制作5.10.1.1本工程灌注桩钢筋笼长度长约9-17米,钢筋骨架长度受起吊高度及运输条件限制,拟分成两段分别制作,两段钢筋骨架之间的钢筋接头采用塔接双面焊接法,钢筋接头顺圆周方向排列。两接头范围内的箍筋,待两段钢骨架焊接后再绑扎。5.10.1.2钢筋骨架材料和制作应遵守有关规定外,还必须遵守以下操作规程:钢筋骨架的成型采用加箍筋成型法,每隔2m设置一道强箍。为不妨碍旋筋的邦扎,将加强箍筋设在主筋内侧,制作时,按设计位置布置加强箍筋,并标明主筋位置,将标有加强箍筋位置的主筋进行点焊,在加强箍筋和全部主筋焊接后,绑扎螺旋筋,并采用部分焊加强。刚

39、筋骨架的顶端焊四个挂环,以便将钢筋骨架临时吊挂在钻机大梁或护筒口上,挂环高度应使骨架在孔内的标高符合设计要求。骨架上端主筋部应焊加强筋一道,以方止上端主筋在骨架上放时插入孔壁或导管提升时挂导管。为了控制钢筋保护层,钢筋笼外侧设置混凝土保护层垫块,每米设置一块,一断面上设置5块。混凝土垫块的设置方法可以采用以下两种:a. 条形垫块垫块尺寸宜长为100200mm,其厚度依设计保护层而定。在垫块内侧埋设两根绑扎用的铁丝,以便于主筋绑扎。b. 穿心圆垫块垫块直径以能控制保护层厚度为准,穿心孔直径要略大于箍筋直径,以便垫块串在箍筋上能转动。5.10.2钢筋骨架吊装刚筋骨架利用钻机的脚架吊起放入桩孔内,当

40、前一段放入孔内后上端用钢管临时担在护筒口,再吊起另一段与其对正,做好焊接后放入孔内,直至设计标高。刚筋骨架无论用何种方法运输,都不得使骨架产生变形。5.11灌注水下混凝土5.11.1商品混凝土灌注桩用混凝土采用泵送商品混凝土,水泥采用42.5 级矿渣水泥,其品质除应符合国家的现行标准外,按标准方法车规定的初凝时间不宜小于2.5 小时,每立方米混凝土水泥用量不小于350kg。粗骨料选用540碎石,细骨料选用及配良好的中砂,砼坍落度为1822cm,含砂率为4050%,水灰比采用0.50.6。为延缓初凝时间,可在初期灌注的砼掺入塑化剂或缓凝剂等掺料,掺入量由试验决定,砼的实际配制强度比设计强度提高1

41、015%。5.11.2关注设备安装5.11.2.1导管导管采用直径为258毫米壁厚3cm钢板卷制管,丝扣联接。导管掉放时,采用两根钢丝绳分别系在最下一节导管两侧的吊耳上,并延导管外壁每隔11.5米左右用铅丝将导管与钢丝绳捆绑在一起。钢丝绳沿导管外壁引出桩孔外,经灌注架顶部的转向滑轮再引向卷扬机。 5.11.2.2灌注架 灌注架利用钻孔机架,储料斗和漏斗连为一体,悬吊于钻孔机架上。 5.11.2.3测深 灌注砼前用测深尺或测深锤测孔深与成孔时的孔深相比较,计算回淤沉淀厚度,如超出规定,应再次进行清孔,保证灌注桩的实际长度达到设计要求。 5.11.2.4 灌注水下砼砼灌注前对桩孔质量、回淤沉淀厚度

42、、泥浆指标、钢筋骨架质量、桩底标高等进行一次全面的最终检查,并认真填写记录,合格并经验收签证后方才开始灌注砼。水下砼灌注应连续进行,严禁中途停顿。导管提升应勤提、少提、保持位置居中,轴线垂直逐步提升。当导管法篮卡挂钢筋骨架时,可转动导管,使其脱开钢筋骨后移至钻孔中心,随着孔内砼的上升,导管应逐节拆除,拆下的管节应立即冲洗干净,堆放整齐。在灌注过程中,当导管内混凝土不满,含有空气时,后灌的混凝土宜采用溜槽徐徐通过漏斗入导管。灌注过程中不得将整斗混凝土倾入管内,以免在导管内形成高压气流,挤出管间的橡胶圈使导管漏水。当混凝土面升至钢筋骨架下端时,应保持埋管较深,并适当放慢灌注速度,以防止钢筋骨架被顶

43、托上升。当孔内混凝土面钢筋骨架12m后,应适当提升导管,但导管埋置深度不小于2米。混凝土实际灌注高度应比设计桩顶高出一定高度,其数量根据设计及验收规范等因素来合理确定。每根桩混凝土试块一组。桩顶2米以下灌注的混凝土,依靠自由坠落捣中,不再用人工捣实,在此线以上灌注的混凝土用振捣器捣实。在灌注水下混凝土时,每根桩应不小于二组的混凝土试件。5.12 质量通病的预防与处理5.12.1 坍孔5.12.2 原因分析:提升、下落冲锤、掏渣筒和放钢筋时碰撞孔壁;护筒周围未用粘土填土封紧密而漏水或埋置太浅。未及时向孔内回清水或泥浆,孔内泥浆面低于孔外水位,或泥浆比重偏低;遇流砂、软淤泥、破碎地层,在松软砂层钻

44、进时,进度太快。5.12.1.2 预防措施和处理方法 用冲孔机时,开孔阶段保持低锤密击,造成坚固孔壁后再恢复正常冲击。 清孔完立即灌浇混凝土,加大泥浆比重和提高水位,严重坍孔,用粘土,泥膏投入,待孔壁稳定后采用低速重新钻进。5.12.2 钻孔偏斜5.12.2.1原因分析: 桩架不稳,钻杆导架不垂直,钻机磨损,部件松动; 地层软硬不均; 冲孔机成孔时遇探头石或基岩倾斜未处理;5.12.2.2 预防措施及处理方法 将桩架重新安装牢固,并对导架进行水平和垂直校正,检修钻设备; 若有探头石,宜用钻机钻透,用冲孔机时,用低锤密击,把石打碎,基岩倾斜时,投入块石使表面略平,用锤密打; 偏斜过大时,填入石子

45、粘土,重新钻进,控制钻速,慢速提升下降往复纠正。5.12.3 导管进水5.12.3.1 原因分析: 首批混凝土储量不足,或导管底口距孔底的距离过大,混凝土下落后不能埋没管底口,以致泥水从底口进入; 导管接头不严,焊接破裂,水从接头或焊缝中流入; 导管提升过猛,或测深错误,导管底口超出原混凝土面,底口涌入泥水。5.12.3.2 预防措施与处理方法: 若是上述第一种原因引起的,应立即将导管提出;将散落在孔底的混凝土用空气吸泥机或抓斗清出,然后准备足够储量的首批混凝土,重新灌注。 若是上述第二、三种原因引起的,应视灌注情况,拔除原导管重下新管,或用原导管插入续灌。但灌注前均应将进入导管内的水和沉淀土

46、用吸泥和抽水后导管内翻水,导管插入混凝土内应有足够的深度,续灌的混凝土应增加水泥量,提高稠度,灌入导管内,随后的混凝土可恢复正常的配合比。5.12.4 卡管5.12.4.1 原因分析: 初灌时由于各种原因使混凝土离析,粗骨料集中,造成导管堵塞;由于机械发生故障或原因,混凝土在导管内停留时间过久;或灌注时间持续过长,最初灌注的混凝土已经初凝,增大了导管内混凝土下落的阻力,混凝土堵在管内。5.12.4.2 处理方法:对于第一种原因,除可针对性地采取有效预防措施外,可用长杆冲捣,用吊绳抖动导管,或在导管上端装附着式振捣等方法迫使隔水栓或混凝土下落。如仍不能落时,则须将导管连同管内混凝土提出进行清理,重新下导管灌注,并按导管进水第2种处理方法处理,提管时应注意导管上重下轻,避免翻倒伤人。 对于第二种原因,一方面采取措施,加快灌注混凝土的速度;必要时也可在首批混凝土中掺入缓凝剂,以延缓混凝土的初凝时间。当灌注时间已久,孔内首批混凝土已初凝,混凝土堵塞在导管内,应将导管拔出,用吸泥机将表层混凝土和泥浆、渣土等吸出,重下导管。 5.12.5 断桩、夹泥断桩、夹泥事故大都是以上各种事故引起的次生结果。此外,由于清孔不彻底,或灌注时间过长,首批混凝土已近初凝,流动性降低,而继续灌注的混凝顶破顶层而上升,在混凝土中夹有泥浆渣土;甚至整桩夹有泥浆渣土形成断桩。

展开阅读全文
相关资源
猜你喜欢
相关搜索

当前位置:首页 > 其他


经营许可证编号:宁ICP备18001539号-1