When using rotary drilling rigs, due to varying terrain, geology, and working conditions, the drilled pile diameter may be smaller than the design diameter, causing construction difficulties. In such cases, Shandong Liqiang Machinery suggests carefully checking the following aspects to resolve the issue of small rotary drilling rigs producing piles with a smaller than designed diameter:#drill h#
First, Northern Foundation Rental, a rotary drilling rig manufacturer, teaches you how to prevent and resolve this issue:
1. When the designed pile spacing is small, skip 1-2 piles during construction. New piles should ideally be drilled 36 hours after the completion of adjacent piles.
2. If the drill bit is excessively worn, supplement its diameter. Check for wear on the drill bit during construction.
3. Use high-quality drilling mud, controlling its specific gravity and viscosity to reduce water loss.
4. When the pile diameter becomes smaller, use a drill bit of appropriate size with suitable drilling mud to clear the hole. After clearing the hole, pour concrete as soon as possible.#drill h#
Based on the above method, I believe everyone has mastered it. Generally, there are three reasons why the diameter of a rotary drilling rig's pile may be smaller than the design diameter:
1. Poor mud properties, resulting in high water loss, causing the plastic soil layer to absorb water and expand, or forming a loose, honeycomb-like thick mud cake.
2. Excessive wear on the drill bit diameter.
3. Improper spacing between adjacent piles, resulting in unresolved stress in the soil layer and loss of soft soil from the new borehole wall.#drill h#
