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【正文】 mmer and drill rod, a drill diameter engineering should be consistent, the heavy hammer is consistent。 ⑥ drilling holes to be filled with sand after. 3, foundation reinforcement I, foundation reinforcement principle Foundation reinforcement principle is: the soil by the pine real change, soil moisture changes from high to low, can achieve the purpose of foundation reinforcement. Engineering practice of strengthening methods, such as mechanical pressing method, tamping method, paction pile method, chemical grouting, preloading consolidation method, deep mixing method are from the reinforcement principle. II, foundation reinforcement method ① Dug: digging to soft soil, the foundation embedded in large bearing capacity of rock and hard soil layer. This method when the soft soil layer is thick, the hard soil layer natural foundation, economy. ② Fill: when the soft soil is very thick, and large area on foundation reinforcement treatment, may be in the soft soil layer of certain thickness directly Backfilling on good soil, in order to improve the low bearing capacity of soft soil, reduce the bearing pressure. ③ Change: change is to dig and fill the bination, namely soil replacement cushion method. ④ Ram: is the use of ramming tools or equipment ( such as wooden statues, stone me, iron I, frog rammer, fire, electricity, hammer tamping rammer, strong paction paction soil ), exclusion of moisture in the soil, accelerating soil consolidation, to improve soil pactness and bearing capacity. ⑤ Pressure: is the use of road roller, sheep foot machine, tire roller machine rolled foundation soil, the foundation paction consolidation. The sand dra
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