机械旋挖灌注桩专项施工方案

*******生态停车场项目机械旋挖灌注孔桩专项施工方案

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目录

一、编制依据： ------------------------------------------------------------------------------------------ - 3 -

二、工程概况 --------------------------------------------------------------------------------------------- - 3 -

2.1建设概况----------------------------------------------------------------------------------------- - 3 -

2.2设计概况----------------------------------------------------------------------------------------- - 4 -

2.3地质及水文概况-------------------------------------------------------------------------------- - 8 -

2.3.1地形、地貌 ----------------------------------------------------------------------------- - 8 -

2.3.2地质构造 -------------------------------------------------------------------------------- - 8 -

2.3.3岩土构成及其均匀性评价 ----------------------------------------------------------- - 8 -

2.3.4不良地质及特殊岩土 ----------------------------------------------------------------- - 8 -

2.3.5水文地质特征 -------------------------------------------------------------------------- - 8 -

2.3.6持力层选择 ----------------------------------------------------------------------------- - 9 -

三、施工要求 --------------------------------------------------------------------------------------------- - 9 -

3.1、机械成孔灌注桩的施工要求 -------------------------------------------------------------- - 9 -

3.2、旋挖桩应进行单桩承载力和桩身完整性检测 --------------------------------------- - 10 -

四、施工部署： ---------------------------------------------------------------------------------------- - 10 -

4.1总体部署--------------------------------------------------------------------------------------- - 10 -

4.2施工准备----------------------------------------------------------------------------------------- 11 -

4.3施工组织与管理-------------------------------------------------------------------------------- 11 -

4.4 施工计划 -------------------------------------------------------------------------------------- - 12 -

4.5现场排水方法------------------------------------------------------------------------------------- 13

4.6材料、机械设备、劳动力计划 --------------------------------------------------------------- 13

五、主要施工方法 ----------------------------------------------------------------------------------------- 14

5.1施工流程------------------------------------------------------------------------------------------- 14

5.2施工测量------------------------------------------------------------------------------------------- 16

5.3桩孔施工------------------------------------------------------------------------------------------- 16

5.3.1场地布置 ---------------------------------------------------------------------------------- 16

5.3.2软土地基处理 ---------------------------------------------------------------------------- 16

5.3.3 钢护筒制作及埋设---------------------------------------------------------------------- 17

5.3.4钻机就位 ---------------------------------------------------------------------------------- 17

5.3.5钻孔施工 ---------------------------------------------------------------------------------- 17

5.3.6 地质情况记录---------------------------------------------------------------------------- 19

5.3.7成孔检查 ---------------------------------------------------------------------------------- 19

六、桩身钢筋混凝土------------------------------------------------------------------------------------- 19

6.1钢筋工程------------------------------------------------------------------------------------------- 19

6.1.1 施工流程---------------------------------------------------------------------------------- 19

6.1.2 钢筋笼制作------------------------------------------------------------------------------- 19

6.1.3 钢筋笼吊装------------------------------------------------------------------------------- 20

6.1.4钢筋笼上浮的处理 ---------------------------------------------------------------------- 20

6.1.5 钢筋笼隐蔽检查------------------------------------------------------------------------- 20

6.2声测管埋设---------------------------------------------------------------------------------------- 20

6.3桩身砼施工---------------------------------------------------------------------------------------- 21

6.3.1 套管下方---------------------------------------------------------------------------------- 21