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目前长螺旋钻机主要应用于垂直成孔混凝土灌注桩施工。该型钻机的钻具主要由钻齿、螺旋叶片、中心管等组成。钻齿用于挖掘钻进,螺旋叶片用于将挖掘出的土壤输送至地面。成孔后,通过中心管将一定压力混凝土输送至钻头前部,随着钻杆的提升,即可将混凝土灌注到整个桩孔内。由于该类钻具零部件结构简单、加工成本低,总成质量轻,施工效率高,操作方便,因而得到广泛应用。1.存在问题为了保证长螺旋钻机在施工过程中的作业效率,通常要根据施工特点选择钻具:一是根据土质的硬度选择锥形螺旋钻头或齿形钻头;二是根据土质的输送性能选择长螺旋或短螺旋钻杆,三是根据
At present, long auger rigs are mainly used in vertical perforated concrete bored pile construction. The drilling rig drilling mainly by drilling teeth, spiral blades, the center tube and other components. Drilling teeth are used for digging and drilling. Helical blades are used to transport the excavated soil to the ground. After the hole is formed, a certain pressure of concrete is delivered to the front of the drill bit through the central pipe. As the drill pipe is lifted, the concrete can be poured into the whole pile hole. Due to the simple structure, low processing cost, light assembly weight, high construction efficiency and convenient operation, the components of such drilling tools are widely used. 1. Existing problems In order to ensure the long auger operation efficiency in the construction process, usually according to the construction characteristics of the selection of drilling tools: First, according to the hardness of the soil selection taper screw bits or tooth-shaped drill bit; Second, according to the transport properties of soil selection Long spiral or short spiral drill pipe, the third is based on