In the construction project, due to the need to compact the loose soil, dynamic rammer is often used. There are many types of dynamic compaction machines, such as frog type, vibration type, jump type, ramming type and lifting hammer type. According to the needs of the project, different types of dynamic compaction machines are used.

强夯机出租_设计

Dynamic compaction machine rental_ Design

1、强夯置换法在设计前必须通过现场试验确定其运用性和处理效果。应在施工现场有代表性的场地上选取一个或几个试验区，进行试夯或试验性施工，试验区数量应根据建筑场地复杂程度、建筑规模及建筑类型确定。

1. The applicability and treatment effect of dynamic compaction replacement method must be determined through field test before design. One or several test areas should be selected on the representative site of the construction site for trial compaction or experimental construction. The number of test areas should be determined according to the complexity of construction site, building scale and building type.

2、强夯置换墩的深度由土质条件决定，除厚层饱和粉土外，应穿透软土层，到达较硬土层上，深度不宜超过7m。

2. The depth of dynamic compaction replacement pier is determined by the soil conditions. In addition to the thick saturated silt, it should penetrate the soft soil layer and reach the hard soil layer. The depth should not exceed 7m.

3、墩体材料可采用级配良好的块（片）石、碎石、矿渣等坚硬粗颗粒材料，粒径不宜大于夯锤底面积直径的0.2倍，含泥量不宜大于10%，粒径大于300mm的颗粒含量不宜超过全重的30%。

3. The materials of pier body can be hard coarse-grained materials such as block stone, crushed stone and slag with good grading. The particle size should not be greater than 0.2 times of the diameter of the rammer bottom, the mud content should not be greater than 10%, and the content of particles with particle size greater than 300 mm should not exceed 30% of the total weight.

4、强夯置换法的单击夯击能应根据现场试验确定。夯点的夯击次数应通过现场试夯确定，且应同时满足下列条件：

4. The impact energy of dynamic replacement method should be determined according to the field test. The tamping times of tamping point shall be determined by site trial compaction, and the following conditions shall be met at the same time:

1)墩底穿透软弱土层，且达到设计墩长；

1) The pier bottom penetrates the soft soil layer and reaches the designed pier length;

2)累计夯沉量为设计墩长的1.5～2.0倍；

2) The cumulative settlement is 1.5 ~ 2.0 times of the designed pier length;

3)两击的平均夯沉量不大于下列规定值:

3) The average tamping settlement of the last two blows shall not be greater than the following specified values:

当单击夯击能小于400kN·m时为50mm；当单击夯击能为4000～6000kN·m时为l00mm；当单击夯击能大于6000kN·m时为200mm；

When the single click energy is less than 400 kn · m, it is 50 mm; when the single click energy is 4000 ～ 6000 kn · m, it is 100 mm; when the single click energy is more than 6000 kn · m, it is 200 mm;

4)夯坑周围地面不应发生过大的隆起；

4) The ground around the tamping pit should not have excessive uplift;

5)不因夯坑过深而发生提锤困难。

5) It is not difficult to lift the hammer due to the deep tamping pit.

5、墩位布置宜采用等边三角形或正方形。对独立基础或条形基础可根据基础形状与宽度相应布置。

5. Equilateral triangle or square should be used for Pier location layout. The independent foundation or strip foundation can be arranged according to the foundation shape and width.

6、墩间距应根据荷载大小和原土的承载力选定，当满堂布置时可取夯锤直径的2～3倍。对独立基础或条形基础可取夯锤直径的1.5～2.0倍。墩的计算直径可取夯锤直径的1.1～1.2倍。当墩间净距较大时，应适当提高上部结构和基础的刚度。

6. The pier spacing should be selected according to the load and the bearing capacity of the original soil. When the whole hall is arranged, it can be taken as 2-3 times of the rammer diameter. For the independent foundation or strip foundation, 1.5 ~ 2.0 times of the rammer diameter can be taken. The calculated diameter of the pier can be 1.1-1.2 times of the rammer diameter. When the clear distance between piers is large, the rigidity of superstructure and foundation should be increased properly.

7、墩顶应铺设一层厚度不小于500mm的压实垫层。垫层材料一般采用水稳性好的砂、砂砾、石屑、碎石土等。当与墩体材料相同时，粒径不宜大于100mm。

7. A layer of compacted cushion with thickness not less than 500mm shall be laid on the top of pier. Cushion materials generally use sand, gravel, stone chips and gravel soil with good water stability. When the material is the same as the pier body, the particle size should not be greater than 100 mm.

8、强夯置换设计时，应预估地面抬高值，并在试夯时校正。

8. In the design of dynamic compaction replacement, the ground elevation should be estimated and corrected during the trial compaction.