对于竖直方向操作坑深度较大，如果操作坑深度超过单斗的作业高度，则采用阶

For the vertical operation pit depth is large, if the operation pit depth exceeds the working height of the single bucket, the stepped excavation method is adopted. During the excavation process, the flatness and firmness of the excavator or other equipment on the ground must be ensured to prevent the excavator or other equipment from overturning into the operation pit; the operation direction of the mechanical excavation single bucket is only allowed along the center of the pipeline The line is operated on one side, and the distance between the single bucket and the outer wall of the pipeline meets the safe distance of the pipeline in service. In order to prevent the collapse of the operation pit caused by the pile of soil, the excavated soil must not be stacked above the operation pits on both sides of the parallel pipeline centerline. More than 5m. Equipment such as sand blasting vehicles and air compressors are not less than 3m away from the trench wall.

For the vertical direction operation pit depth is large, if the operating pit depth exceeds the operating height of the single bucket, the step-by-step excavation method is used. Excavator excavation process, must ensure that excavators or other equipment docked on the ground flatness and firmness, to prevent excavators or other equipment to reverse into the operating pit; In order to prevent the collapse of the operating pit caused by the pile of soil, the excavated soil is prohibited to be stacked above the operating pit on both sides of the parallel pipeline center line, and can only be stacked in the direction of the vertical pipe center line at both ends before and after the operation pit, and the stacking distance is more than 5m from the trench wall. Swordsblaster, air compressor and other equipment distance from the ditch wall is not less than 3m.

If the depth of the operation pit in the vertical direction is larger than the operation height of a single bucket, the ladder excavation method shall be adopted. During the excavation process of excavator, it is necessary to ensure the flatness and firmness of the ground where the excavator or other equipment stops, so as to prevent the excavator or other equipment from overturning into the operation pit; the operation direction of single bucket of mechanical excavation is only allowed to operate along one side of the pipeline centerline, and the distance between the single bucket and the outer wall of the pipeline meets the safety distance of the pipeline in service. In order to prevent the collapse of the operation pit caused by soil stacking, the excavated soil shall not be stacked above the operation pit on both sides of the parallel pipeline center line, and can only be stacked at the front and rear ends of the operation pit perpendicular to the pipeline center line direction, and the stacking distance shall be more than 5m from the trench wall. The distance from equipment such as sand blasting car and air compressor to trench wall shall not be less than 3m.