Due to the need of compaction of loose soil in construction engineering, when the depth of foundation is greater than the depth of groundwater level, drainage must be carried out for foundation trench excavation and foundation construction. Small and medium-sized projects have a small amount of water, so drainage ditches and water collecting wells can be used for drainage. Light well point, tube well point or deep well point should be selected according to the specific situation. Therefore, the following aspects should be paid attention to when using dynamic compaction machine

1.点夯施工测量

1. Construction survey of point compaction

强夯机在被运用时需要测量每一个夯点的起夯面高程，每一击夯沉量，以及每遍终夯沉量。测量应使用经校正好的水准仪，同也夯点每击夯沉量的测量仪器应假设在相同位置高程。

When the dynamic rammer is used, it is necessary to measure the elevation of each tamping point, the settlement of each tamping point and the final compaction settlement of each pass. The calibrated level gauge shall be used in the survey, and the measuring instrument for each tamping settlement of the same tamping point shall be assumed to be at the same elevation.

2.推平夯坑

2. Push and level the tamping pit

强夯机在一遍点夯完成后，推平夯坑，再进行下一遍夯击，不应将在进行遍夯点与在进行第二遍夯击的夯点混在一起，交替施工，及时推平夯坑有利于减少对下一遍夯击造成影响。

After the completion of one-time point compaction, the dynamic rammer shall level the tamping pit, and then carry out the next compaction. It is not allowed to mix the tamping point of the first time with that of the second time. Alternate construction shall be carried out, and the tamping pit shall be pushed and leveled in time to reduce the impact on the next compaction.

3.确定落距

3. Determine the falling distance

按设计要求，单点行及能量设点落距，脱钩器于起重机的吊钩和脱钩拉索连接好之后，在脱钩器的吊钩上，系上钢尺或测绳，提升脱钩器，到了一定高度，即脱钩器吊钩与地面的高度为落距于夯锤高度只和，此时可将脱钩器拉索的下端于起重机前部的稳定部位加以牢固的连接。

According to the design requirements, the drop distance of single point line and energy is set. After the coupler is connected with the hook of the crane and the unhooking cable, steel ruler or measuring rope is tied on the hook of the decoupler to lift the decoupler to a certain height, that is, the height between the hook of the decoupler and the ground is only the drop distance and the height of the hammer. At this time, the lower end of the cable of the decoupler can be fixed at the stable position in front of the crane Strong connection.