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[其他] 质量控制点初探(2) [复制链接]

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桩基(予应力管桩)Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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放线(轴线、标高位)Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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停止点,按规划部门控制点校核Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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复查、测量Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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管桩成品质量Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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停止点,生产厂家资质、产品合格证;质量保证资料;成品观感质量检查;实测实量;控制允许偏差范围Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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尺量,检查Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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控制点,吊点位置应符合设计要求;运输过程中必须采取可靠的防损、防滚、防滑措施; 管桩、管节应按规格材质分开堆放,堆放层次不宜太高.Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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起吊、运输、堆放安全可靠Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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旁站监理Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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打桩顺序Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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控制点,Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß
打桩宜按中间向四周;中间向两端;先长后短;先高后低原则确定打桩顺序。Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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打桩顺序合理Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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桩机就位Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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控制点,桩架龙口必须挺直,应确保桩锤、桩帽、桩身在同一轴线上,桩架要坚固、稳定,并有足够的刚度,锤击时不产生颤动位移。桩垫应有一定的弹性和韧性,有足够的厚度并经常检查,及时更换或补充。Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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桩机安装符合要求Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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桩位偏差Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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控制点,桩位偏差在允许范围内Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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桩垂直度Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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见证点,起吊就位插入地面时的垂直度用长条水准尺或两台经纬仪随时校正垂直度偏差不得大于桩长的0.5;施打过程中,桩锤、桩帽、桩身的中心线应重合.Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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施打过程中桩垂直度符合要求Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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管桩接头Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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控制点,管桩入土部分桩头高出地面0.51.0时接桩,接桩时,上节桩应对直,轴向错位不得大于2mm。采用焊接接桩时,上下节桩之间的空隙应用铁片全部填实焊牢,结合面的间隙不得大于2mm。焊接坡口表面用铁刷子刷干净,露出金属光泽。焊接时宜先在坡口圆周上对称点焊6点,待上下桩节固定后拆除导向箍再分层施焊。施焊宜由23名焊工对称进行,焊缝应连续饱满,焊接层数不少于三层,内层焊渣必须清理干净以后方能施焊外一层,焊好后的桩必须自然冷却8分钟方可施打,严禁用水冷却或焊后即打Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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焊接接桩符合规定。Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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送桩Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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控制点,送桩深度不宜大于2.0m,当桩顶打至接近地面需要送桩时,应测出桩垂直度并检查桩顶质量,合格后立即送桩,收锤贯入度可按不送桩的小5mm来控制Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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送桩应满足强度和刚度 等要求Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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贯入度控制Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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控制点,每根桩的总锤击数不宜超过2500击,最后1沉桩锤击数不宜超过300击,最后贯入度以试验桩打完后设计院提出的数值为准但不宜小于20/10击,并且最后贯入度应在以下条件下测量:桩头完好无损、柴油锤跳动正常、桩锤、桩帽、送桩器及桩身的中心线重合、桩帽衬垫厚度等正常、打桩结束前立即测定。Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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控制贯入度Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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见证点,桩头截除应采用锯桩器截割,严禁用大锤横向敲击或强行扳拉截桩,截桩后桩顶标高偏差不得大于10cm.Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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截桩头应符合规定Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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停止点,成桩质量可靠性低的灌注桩,应采用静载荷试验的方法进行检验,检验桩 数不应少于总桩数的1%,且不应少于3根,当总桩数少于50根时,应不少于2根。Æ ÿFÞsQå"bbs.3c3t.comâ¸,}Œcã*ß

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