At present, the foundation of construction projects requires compaction of loose soil, which is inseparable from tamping. Tamping the foundation of small construction projects can be completed with a small electric tamping machine. Larger construction projects usually have hard indicators for the foundation, and they need to be tamped to a certain extent before they are qualified. In this way, there are certain indicators for the tamping machine, so the dynamic tamping machine is required.
Dynamic compaction method is also called dynamic consolidation method. A large crawler type dynamic compactor is used to free fall 8-30 tons of heavy hammer from a height of 6-30 meters to strongly compact the soil, rapidly improve the bearing capacity and compression modulus of the foundation, form a relatively uniform and dense foundation, and change the pore distribution of the foundation soil within a certain depth of the foundation. The dynamic compaction method has been widely used in the foundation reinforcement projects of expressways, railways, airports, nuclear power plants, large industrial areas, port reclamation and so on. The utility model has the advantages of short construction period, good effect and low cost.
The dynamic compaction machine rental manufacturer believes that the dynamic compaction method is applicable to the treatment of gravel soil, sandy soil, silt and clay with low saturation, collapsible loess, plain fill and miscellaneous fill and other foundations. Before dynamic compaction construction, one or several test areas shall be selected on the representative site of the construction site for trial compaction or experimental construction. The number of test areas shall be determined according to the complexity of the construction site, construction scale and building type.
What are the advantages of dynamic compaction machine construction? Simple construction process and operation; It is applicable to a wide range of soil, with remarkable reinforcement effect. It can obtain high bearing capacity, and the general foundation strength can be increased by 2 ~ 5 times; The compressibility can be reduced by 2 ~ 10 times, and the influence depth of reinforcement can reach 6 ~ 10m; High work efficiency and fast construction speed (general equipment can reinforce 5000 ~ 10000m foundation per month), which can shorten the construction period by half compared with backfilling and pile foundation; Save reinforcement raw materials; The construction cost is low and the investment is saved, which is 50% less than that of soil replacement and backfilling, and 50% ~ 70% less than that of precast pile foundation reinforcement.
In addition, correct construction matters should be understood, such as careful investigation to ensure that there are no underground structures within the dynamic compaction site. The surface soil shall be removed within 2 ~ 3M outside the subgrade slope toe. After leveling, mark the position of one tamping point on the site, control the point position deviation within ± 20cm, and measure the site elevation. The crane shall be in place to align the rammer with the tamping point and measure the hammer top elevation before tamping.
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