论文部分内容阅读
1 概述干作业长螺旋钻成孔灌注桩具有振动小、噪声低、不扰民、钻进速度快、施工方便等优点 ,但主要缺点是桩端或多或少留有虚土 ,只适用于地下水位以上的土层中成孔。近 2 0多年来 ,国内外推出将通常长螺旋钻机只能进行干作业拓展到进行湿作业 (即在地下水位以下成孔成桩作业
1 Overview Drilling long helical bored piles with vibration, low noise, non-nuisance, drilling speed, construction convenience, etc., but the main drawback is more or less pile left virtual soil, only for groundwater Bit into the soil above the hole. In the recent 20 years or so, domestic and international launches have generally extended long-auger rigs to dry operations (ie, piling into holes below the groundwater table)