บทความ
Not be placed in the pile toe sand layer or clay with sand mixed in the volume close to each other because if drilling into the soil. Groundwater often flows into the borehole at all times. Due to the difference of pressure Sak groundwater. Due to the difference of pressure Sak groundwater to soil swelling and full up. Cause the soil pile at the end of losing the stability condition. Reduce the bearing capacity at the lower end of the needle.
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