Construction process of directional drilling Equipment in place Determine the crossing route Measuring payoff Preparation before construction Reaming Traction pipe crossing Pipe welding Guided drilling Mud wall Backfilling Pipe welding Pressure flushing Foundation pit excavation of directional drilling process Two pipe pits, главная яму вспомогательной ямы, размер 5 метров в длину × 8 meters wide × 3.5 …