Bored pile drilling-what is impact drilling?
1. When drilling, the mud should be poured into the hole first. If there is water in the hole, you can directly put in clay and use an impact cone to repeatedly make pulp with a small stroke.
2. During the hole opening and the whole drilling process, the water level in the hole should always be kept 1.5 ~ 2.0m above the groundwater level, and 0.3m below the top surface of the protective cylinder, and water should be replenished in time after slagging.
3. When the silt layer and clay layer are impacted, the drill should be impacted with a medium stroke (1.0 ～ 2.0m). When the sand layer is impacted, a small piece of stone and clay should be added with a small stroke (0.5 ～ 1.0m) to repeatedly impact to strengthen the retaining wall. In the drifting stone and hard rock formation, the impact of the small stroke of the heavy hammer (1.0 ~ 2.0m) should be replaced. When impacting in stone formations, if the diameter of the stone drill collar floating from the hole is between 5 and 8 mm, the mud concentration is suitable. If the diameter of the floating drill collar is small and small, it indicates that the mud concentration is not sufficient. The pulping pond draws qualified mud into the circulation.
4. During impact drilling, the operator must place the main wire rope in time according to the speed of the tape, so that the wire rope is always in a tensioned state during each impact. It can neither be put less or more, and the drill bit cannot fall. At the bottom of the hole, emptying the hammer not only fails to obtain the footage but may cause the wire rope to be interrupted and the hammer dropped. If you put it too much, the drill will tilt toward the hole wall after falling to the bottom of the hole, and hit the hole wall to cause reaming.
5. In any case, the maximum stroke should not exceed 6.0m. In order to correctly increase the stroke of the drill cone, a length mark should be made on the wire rope.
6. The adjacent pile holes in deep water or poor geological conditions shall not be drilled at the same time.
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