某超大深基坑工程,上部采用土钉墙,下部采用桩锚支护;考虑时空效应,对基坑壁中部范围进行加强.采用顺作法,深基坑及基础工程分区流水施工,采用天然土坡道将基坑深部土方外运出坑外.根据土质情况,支护桩、工程桩分别采用长螺旋钻机、旋挖钻机成孔.工程桩在上层土方开挖后进行坑底施工.结合施工现场具体条件确定施工方案,取得了良好的效果.%In the large deep foundation pit engineering,the soil nailing wall in the upper and the pile anchor supporting in the lower were used;considering effect of time and space,we strengthened foundation pit wall in the central range.Adopting suitable methods,we used partition running water construction in the deep foundation pit and foundation construction,took the earthwork out of deep foundation pit out the pit use by the natural slope.According to soil conditions,we made the hole of supporting pile and engineering pile respectively by long spiral drill stem and rotating drill.After the upper earth excavation,engineering pile were constructed in the pit.Combined with the specific conditions of the construction site,the construction plan was determined,which achieved good effect.
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