项目规划两个地下车库（地下车库一、地下车库二） , 本工程为地下车库一, 设两层地下室, 地下建筑面积20647.82平方米, 地下室周长约447.0m。本工程± 0.000m相当于广州城建高程7.80m, 现基坑周边场地广州城建高程6.40 ～6.90m；地下室底板面广州城建高程-0.35m, 地下室周边剪力墙承台高1.5m,即基坑开挖深度考虑至广州城建高程-1.85m, 则基坑开挖深度为8.25 ～8.75m。电梯井坑中坑深度为2.0m。
地下车库一因历史原因已放坡开挖3.0 ～3.5m, 并且于基坑内换填了1.0m厚砖渣打设管桩, 现状坑底广州城建高程3.40m, 根据上述基坑开挖深度, 现还需开挖约5.25m方能满足结构施工。从场区地质条件来看, 广州城建高程3.4m以下为淤泥、淤泥质土层, 不再适宜放坡开挖, 应进行垂直支护开挖。
第一节工程概述........................................................................................................................................................ 1
第二节施工总平面布置 .............................................................................................................................................. 5
一、施工总平面布置 ............................................................................................................................................. 5
二、施工准备 ......................................................................................................................................................... 6
第三节主要施工方案.................................................................................................................................................. 7
1、边坡修整, 挂网, 抹水泥砂浆 ............................................................................................................................ 7
2、搅拌桩的施工安排 ........................................................................................................................................... 7
3、锚索的施工安排 ............................................................................................................................................... 7
4、钢管锚杆桩的施工安排 ................................................................................................................................... 7
5、钢管桩施工 ....................................................................................................................................................... 8
6、土方开挖 ........................................................................................................................................................... 8
7、土方外运 ......................................................................................................................................................... 13
8、基坑排水 ......................................................................................................................................................... 13
第四节主要施工工艺................................................................................................................................................ 14
一、搅拌桩施工 ................................................................................................................................................... 14
三、钢管桩施工 ................................................................................................................................................... 18
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