When using a small pile driver, many problems may arise, including the issue of hole collapse, which has been reported by many users during operation. How can this be addressed? Shandong Hengwang Group will guide you through solutions and handling methods for hole collapse. During the pouring process with a small pile driver, if you notice the mud level in the well casing suddenly rising and spilling over, then suddenly dropping and bubbling, consider the possibility of hole collapse. This can be checked with a depth hammer; if the hammer hangs on the concrete surface without being pulled out, or cannot reach its original depth when probing, this indicates a significant discrepancy. The collapse may be caused by water leakage at the bottom of the casing or a decrease in the water level inside the hole or tidal rivers. When the tide rises, the difference in water level inside the hole decreases, and the original hydrostatic pressure can no longer be maintained, or the collapse could be caused by heavy objects piling up around the casing or vibrations from the pile driver.

After identifying the cause of the collapse, take corresponding measures such as maintaining or increasing the water head, removing heavy objects, eliminating vibrations, etc., to prevent further collapse; then use a mud suction machine to remove the collapsed soil and proceed with normal grouting if there are no further collapses.

Pile Driver

If the collapse is not severe, backfill above the collapse site and continue drilling with improved mud performance, increased water head, and deeper casing placement. If the collapse is severe, immediately backfill with sand or small stones mixed with clay and temporarily stop the operation of the small pile driver. After some time, identify the cause of the collapse and take corresponding measures to drill again.