高架桥系梁施工技术交底

湖南省浏阳至醴陵高速公路第十三合同段毛连湾高架桥（K80+640）系梁施工技术交底浙江八咏公路工程有限公司二0一0年七月制墩号桩顶（系梁顶）标高系梁高（m）锁口标高设计桩底标高桩长（锁口到设计桩底）（m）0-078.2040-178.2040-278.4290-378.4291-01.668.1001-11.668.1001-268.1001-368.1002-01.663.1002-11.663.1002-284.6001.684.97263.10021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.32624.0262-384.6001.684.86363.10021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.32624.0263-085.6001.686.13566.10021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.32624.0263-185.6001.685.54166.10021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.32624.0263-284.9001.685.44166.10021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.32624.0263-384.9001.685.12566.10021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.32624.0264-086.3001.687.80866.30021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.32624.0264-186.3001.686.04166.30021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.32624.0264-285.8001.686.12066.30021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.80220.45526.3264-385.8001.685.83666.30021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.23622.8025-086.2001.687.86466.70021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.62720.2365-186.2001.686.00566.70021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.26422.6275-284.7001.685.84066.70021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.20119.2645-384.7001.685.88366.70021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.14019.18319.2016-089.7001.689.90170.70021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.30519.1406-189.7001.689.96470.70021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.16419.3056-285.7001.688.32765.70021.87221.76320.03519.44119.34119.02521.50819.74119.82019.53621.1646-385.7001.685.93665.70021.87221.76320.03519.44119.34119.02521.50819.74119.82019.5367-091.1001.692.90270.10021.87221.76320.03519.44119.34119.02521.50819.7417-191.1001.690.55570.10021.87221.76320.03519.44119.34119.02521.5087-288.1001.690.42664.10021.87221.76320.03519.44119.34119.0257-388.1001.688.12664.10021.87221.76320.03519.44119.341毛连湾高架桥底系梁施工技术交底毛连湾高架桥桩基已灌注24根。底系梁施工即将全面展开。为保证底系梁的施工质量。将对桥梁施工队进行如下交底。一、工程概况毛连湾高架桥整体线性处于R=2400m的圆曲线上，底系梁分左、右幅径向布置。设计底系梁共13处。与设计代表协商1-2～1-3的底系梁取消，改为桩柱一体。其中，1-2作接桩处理。按桥柱尺寸施工。由于毛连湾桥系梁高程变更，今将底系梁的顶、底面高程列出。详细见表一。二、施工工艺流程测量放线施工石线机械开挖基坑人工清底5cm石渣垫层10#砂浆铺底浇筑破桩头测量放样（桩中心点）放出中心线、模板安装边线安装钢筋安装定型模板检查验收钢筋、模板浇筑砼拆模养护验收三、主要工序施工要求1、基坑开挖本工序主要是机械施工，配合人工清底。基坑开挖一定要在底系梁边线外加宽一边最少1m，另一边最少宽1.8m，保证模板安装的工作面。在基坑周围开挖排水坑有集水井，保证基坑不积水。人工清底要低于设计高程0.1m，15#素砼封底找平。用墨斗弹出中心线、模板内边线。2、破桩头本工序主要用风镐机将设计高程以上超高部分的砼凿除。桩头周边凿到设计高程，中间部份高出2-3cm。用水将桩基上面冲洗干净。测量放出中心点，使整个系梁的几何空间位置满足设计要求。3、钢筋制作及安装立柱钢筋笼与桩基钢筋笼对接长度为1.6m，焊前绑直，按长、中、下三段单面焊，每段焊长100mm。钢筋成形呈微锥形，钢筋重叠，补强变径区的受力能力。要保证桩基中心与立柱中心在同一个点的铅垂线上。立柱必须用风缆固定。系梁钢筋按设计图纸、按数量、规格、尺寸、位置安放并焊接牢固。4、模板安装定型系梁模板用吊车员装到位。上下用对拉螺杆拉紧，处围用斜支撑固定。5、浇筑砼模板安装验收后，进行下道工序，浇筑砼，砼坍落度控制在90mm，砼进仓采用斜形分层，先两侧立柱孔，然后系梁中心，分层厚度≤50cm，振动棒插入快，拔出慢，振动范围为0.5m，严禁振动棒触振模板，施工时振捣器绝对不能触碰模板及钢筋，否则会影响砼的表面质量，最后工序为表面收光。6、预埋件的安装为便于今后对桩基进行沉降观测，在桩基内侧25cm处预埋Φ20*60cm钢筋两根，高出系梁表面1-1.5m。7、拆模浇筑24小时后拆模，吊车、人工配合。模板拆卸过程中不准碰撞系梁。以免伤及系梁，影响表面美观。8、砼养护用水浇进行常规养护，表面覆盖草袋或麻袋，养护时间以7天为宜。四、检验及验收开挖基坑、钢筋绑扎安装、立柱钢筋笼、模板安装每道工序完成后都要请监理工程师进行验收，合格后才能进行下道工序的施工。浇筑砼7天后，回弹仪检测合格后方可回填。五、质量标准基底的平面位置高程允许偏差规定如下：1.平面周线位置不小于设计要求。2.基底高程：土质±50mm石质+50mm，-200mm3.轴线偏位25mm4.检查基底处理和排水情况是否符合要求5.检查施工和有关实验资料钢筋砼系梁质量标准：项目规定允许偏差砼强度在合格标准内轴线偏位（mm）30外形尺寸（mm）0，+30倾斜度0．5%顶面高程（mm）±10六、安全措施1、基坑深度超过1.5m应按规定设置上下坡道或爬梯汛期开挖时要放缓边坡作为排水措施。2、加强现场施工管理，施工现场工作人员必须戴好安全帽及其他安全防护用品。3、基坑周围必须设置围栏，一般加高0.8m的围护栏，挖出的土方运离基坑。机动车通行不得危及坑壁的安全，以防坍塌。4、施工现场电工须持证上岗。5、施工地段设置各种警告标志，夜间应有良好的照明设施，车辆应限速行驶。6、严禁非驾驶员开车或试车，严禁驾驶员酒后驾车，施工机械由专人操作。7、专职安全员除正常在工地检查外，应重点对新工序提出安全注意事项，并配合现场技术员做好安全技术交底。七、环保措施8、施工现场应制定洒水防尘措施，指定专人负责及时清除废渣。对弃土污水不得向河流和施工线外直接倾倒。9、施工机械的废油废水，应采取有效措施处理，不得超标排放污染河流和水源。10、车辆载重要适中，不得超限。车身及轮胎应用水冲洗干净，不得污染道路。对洒落道路的废渣要及时清除。沉淀厚度符合设计要求11、施工设备要经质检部门检验，车辆尾气不得超标。12、夜间施工应采取措施控制噪音，防止扰民。交底人签字/日期：接受交底人签字/日期：监理工程师签字/日期：