围护结构缺陷处理方案XX市轨道交通2号线工程（玉洞~西津）白沙大道站围护结构缺陷处理方案目录第一章编制说明....................................................................................................-2-1.1、编制依据..................................................................................................-2-1.2、编制原则..................................................................................................-2-第二章设计概况....................................................................................................-3-2.1、工程概况..................................................................................................-3-第三章质量通病及处理........................................................................................-3-3.1钻孔灌注桩施工......................................................................................-3-3.1.1缩颈...............................................................................................-3-3.1.2孔底沉淤........................................................................................-4-3.1.3坍孔.....................................................第1页共28页...........................................-4-3.1.4钢筋笼上浮....................................................................................-5-3.1.5断桩与夹泥层................................................................................-6-3.1.6桩顶局部冒水、桩身孔洞............................................................-7-3.1.7桩身上段混凝土强度低................................................................-8-3.2冠梁、砼支撑、砼腰梁施工..................................................................-8-3.2.1常见桩头缺陷.................................................................................-8-3.2.2钢筋焊接及绑扎.........................................................................-10-3.2.3模板安装.....................................................................................-14-3.2.4混凝土浇筑.................................................................................-19-3.4基坑开挖..................................................................................................-23-3.4.1边坡超挖预防措施.....................................................................-23-3.4.2坑底地基土泡水预防措施及处理方法.....................................-23-3.4.3坑底地基土扰动预防措施及处理方法.....................................-23-3.4.4坑底出现流砂预防措施及处理方法.........................................-24-3.4.5坑底土体超第2页共28页挖.............................................................................-24-3.5围檩及支撑架设......................................................................................-24-3.5.1水平位移预防措施及处理方法..................................................-24-3.5.2支撑安装不及时预防措施..........................................................-24-3.5.3支撑与围檩或结构面不垂直预防措施及处理方法...................-25-3.5.4支撑不水平预防措施及处理方法...............................................-25-3.5.5支撑直线度差预防措施...............................................................-25-3.5.6支撑端头板与支撑面不密贴预防措施及处理方法...................-25-3.5.7支护结构与围檩不密贴预防措施及处理方法...........................-26--1-XX市轨道交通2...
