When the drilling rig is in place, it must be smooth, stable, not inclined and not displaced, and certain fixing measures should be taken to prevent displacement and shaking during drilling. In order to control the drilling depth, the ground elevation of each pile position is set for construction control and record. When the drilling rig is in place, measures should be taken to ensure that the drilling tool center coincides with the casing center, and the deviation is not more than 2cm. Casing has the functions of guiding drilling tools, controlling pile position, preventing orifice collapse, static pressure head in high hole of platform and fixing reinforcing cage. It should be buried carefully. The inner diameter of the casing should be larger than the pile diameter 10 ~ 15 cm, depending on the ground conditions. The casing wall thickness is 4 ~ 10 mm thick steel plate, and the opening at the bottom of the casing should exceed the depth of miscellaneous fill. The spout should be 20cm above the ground, the connection between the linings should be straight and welded, with good sealing performance, and the spout should be welded with rings. When burying, the center axis of the pile casing should be aligned with the center of the pile position, and the deviation should not be greater than 20cm. Around the casing, backfill and tamp in layers with clay.
A drilling rig is a support for drilling holes and pouring concrete. The installation should be stable, safe and rigid, and it is not easy to produce displacement and shaking during drilling or other operations. According to the engineering geological data and design data, the appropriate drilling rig type and model should be selected and the appropriate drill bit should be matched. In the process of drilling, the hole-forming center must be aligned with the center of the pile position, and the rig frame must be stable, without displacement, inclination and sinking. After installation in place, after detailed measurement, the base should be firmly plugged with sleepers, and the top should be firmly fixed with cable wind rope. During drilling, it should be checked frequently to ensure that the rotary table is horizontal and the drilling frame is vertical, so as to ensure the verticality of the pile body and the uniform aperture.
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