The compaction kinetic energy of dynamic compaction replacement method shall be determined according to field experiments. The tamping frequency of the tamping point is determined by the on-site trial tamping, and at the same time, it meets the following standards: 1) the pier bottom passes through the soft soil layer to achieve the pier length in the design scheme; 2) The total tamping settlement is 1.5 ~ 2.0 times of the pier length in the design scheme; 3) The average compaction volume of the final two blows shall not exceed the following standard values: 50mm; When the tamping kinetic energy is lower than 400nm technology; When the compaction kinetic energy is 4000 ~ 6000 knm, it is l00mm; 200mm； When the tamping kinetic energy exceeds 6000nm; 4) The road surface around the tamping pit shall not have too many protrusions; 5) If the tamping pit is too deep, it will not be too difficult to lift the hammer. 5. The layout of bridge piles should be equilateral triangle or square. The layout can be carried out according to the basic shape and overall width. 6. The pier spacing shall be selected according to the load size and the bearing capacity of the original soil. 2 ~ 3 times of the rammer diameter shall be taken for the layout of the whole building. For independent foundation or independent foundation, 1.5 ~ 2.0 times of rammer diameter can be used. The measured diameter of bridge pile shall be 1.1 ~ 1.2 times of the diameter of rammer. When the bridge pile spacing is large, the upper end structure and basic bending stiffness shall be improved as much as possible.

、强夯换置法在制定前务必能够 根据开展当场自然环境实验分析明确其应用性和解决学习效果。应在建筑施工公司当场有象征性的场所上选择在其中一个或好多个发展趋势试点区，试夯或实验性新项目工程施工，试点区基本建设总数大家应依据工程建筑活动场所较为复杂危害水平、工程建筑市场容量及建筑构造种类剖析明确。2、强夯换置墩的距离由土层不一样标准要素决策，除厚层饱和状态砂土外，应透过软土壤层，抵达偏硬土壤层上，神经网络不适合应用超出7m。3、墩体材料管理可采用配合比较好的块（片）石、砂砾石、粉煤灰等硬实粗颗粒物关键原材料，粒度不适合時间超过夯锤底面积直径的0.2倍，含粉量不适合采用超过1/10，粒度显著超过300mm 的颗粒物科技含量转变不适合超出全重的3/10。4、墩顶应铺装一层薄厚不小于500mm 的夯实基础垫层。基础垫层混泥土原材料做为一般采用水稳层性好的砂、沙砾、砂砾石、砂土等。当与墩体原材料同样时，粒度不适合超过100mm。5、强夯换置设计方案时，应预计及其路面拉高值，并在试夯时校准。

The dynamic compaction replacement method must be able to clarify its applicability and solution learning effect according to the analysis of on-the-spot natural environment experiment before formulation. The construction company shall select one or more development trend pilot areas for trial compaction or experimental new project construction at the symbolic places on the spot. The total amount of capital construction in the pilot area shall be analyzed and determined according to the more complex hazard level of engineering construction activity places in China, the market capacity of engineering construction and the types of building structures. 2. The distance of dynamic compaction replacement pier is determined by different standard elements of soil layer. Except for the thick saturated sand, it should pass through the soft soil layer and reach the hard soil layer. Neural network is not suitable for application beyond 7m. 3. The key raw materials of hard coarse particles such as block (rubble), sand gravel and fly ash with good coordination can be used for Pier material management. The particle size is not suitable for more than 0.2 times the diameter of the bottom area of the rammer, the powder content is not suitable for more than 1 / 10, and the transformation of scientific and technological content of particles with particle size significantly more than 300mm is not suitable for more than 3 / 10 of the total weight. 4. A layer of compacted foundation cushion with a thickness of no less than 500mm shall be paved on the pier top. As the raw material of foundation cushion concrete, sand, gravel, sand, etc. with good water stability are generally used. When it is the same as the raw material of pier body, the particle size shall not exceed 100mm. 5. During the design scheme of dynamic compaction replacement, it shall be estimated and its pavement elevation value, and calibrated during trial compaction.

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