The mechanical equipment used in dynamic compaction and dynamic compaction replacement construction is very common, and the utilization skills are simple. After compaction, the foundation bearing capacity is significantly strengthened by about two to five times, which can effectively avoid settlement or deformation. The important thing is that the construction period may be shortened by half, and the cost can be saved by a large part. Dynamic compaction support method is to use strong compaction to focus on changing the soil quality of deep foundation pit, so as to make the nature of soil meet the needs of foundation pit support.
The construction method of dynamic compaction replacement is simply to make strong tamping to make the gravel or block stone continuously squeeze into the foundation soil layer, and then repeat tamping and filling the soil layer repeatedly until the required bearing layer can be reached. At this time, a solid pier column can be formed. The nominal load energy of the foundation soil layer will be transmitted to the bearing layer through the pier column, so it has reached the soil layer characteristic standard of dynamic compaction support.
For deep foundation pit support works, before dynamic compaction or dynamic compaction replacement, first carry out the construction operation of water stop curtain, and then wait for the completion of the process to prepare for dewatering to the deep foundation pit, so that the groundwater position of the deep foundation pit is lower than the nominal height of the dynamic compaction foundation by one meter and five meters, At the same time, in the three directions of the East, West and North, the natural slope shall be excavated to half a meter of the elevation parameter value according to the ratio of 1:1.2, and then the backfill dynamic compaction construction shall be performed. It is requested to deal with the soil nailing support project according to the effectiveness of individual dynamic compaction.