What is the function of rapid impact compactor? How does the rapid impact compaction work?

Construction technical characteristics of rapid impact compaction

①Rapid impact compactor can be directly installed on forklifts or excavators flexibly and maneuverably, and the edge position does not need to be independently selected by small and medium-sized compaction tools; ②The depth of effect is large, and it can backfill 1-4m at a time, further improving the high efficiency of engineering construction; ③ Reduce the capital investment of small and medium-sized compaction machinery and equipment and human resources, reduce the utilization rate of the reciprocation of compaction machinery and equipment, and greatly reduce the construction cost; ④ It has mild efficacy, strong and well-proportioned working ability, and is not easy to produce surface in the bottom solution. Hard block, can get a more uniform degree of compaction in a large depth range.

Application field of rapid impact compaction machine

The construction technology of rapid impact compaction is suitable for backfilling of cover slab culvert, basic solution for small areas and backfilling of deep pipe trenches.

The basic principle of rapid impact compaction machine processing technology

①The rapid impact compactor is assembled on a forklift or excavator, which is flexible and flexible; ②The rapid impact compactor does not need to use small and medium-sized compaction tools to solve the edge; 4. The single-machine version of the rapid impact compaction machine can be used for tamping work, reducing the expenditure of machinery and equipment and the cyclic backfilling work of tamping machinery and equipment; 5. The rammer raised to a certain height-to-width ratio accelerates the fall under the action of the force. , and moves repeatedly under the effect of the hydraulic transmission system, quickly hitting the tamper plate with shock absorption pads and negative pressure on the road surface, and then ramming the road surface according to the tamper plate.

Construction effect of backfilling on the back of rapid impact compactor

(1) The rapid impact compactor is used for ribbing of the subgrade at the back of the platform, which can improve the compactness of the subgrade and reduce the settlement of the subgrade. The construction technology clearly proposed in the experiment is more effective, and the selected filler is effective.

(2) The large dynamic stress on the roadbed caused by the rapid impact compactor during operation is affected by the compaction potential, the relative height of the compacted subgrade and the elastic modulus of the subgrade, and the compaction potential is the key influencing factor. The dynamic stress caused by the rapid impact compaction equipment increases with the increase of the tamping frequency, slightly increases with the increase of the relative height of the tamped roadbed, and increases with the increase of the tamping potential. The dynamic stress caused by the first, second and third gears The trend analysis is basically the same.

(3) The longitudinal dynamic stress caused by the rapid impact compactor decreases rapidly with the increase of the depth, and the critical damage depth of stress is in the middle of 20~25m. The total hazard width of the tamper at a depth of 25m is approximately 15m.

(4) The dynamic stress caused by the vibratory roller at the same depth of the roadbed is about 16.0%~20.0% of the tamper, and the dynamic stress caused by the small and medium-sized rammer is about 31%~3.9% of the tamper.

(5) After the subgrade is compacted, the key to increase the bearing capacity is within the depth of 25m, and the average bearing capacity of the second and third gear areas within the range of 25m basically increases by about 20kPa and 30kPa respectively. The higher the tamped subgrade, the smaller the increase in bearing capacity basically.

(6) Subgrade settlement increases with the increase of compaction frequency, and its annual growth rate decreases with the increase of compaction frequency. The subsidence of the foundation gradually decreases with the depth, and the deformation amount mainly appears in the depth range of 15m.

(7) The density of the subgrade surface increases with the increase of the frequency of compaction. The subgrade in the three intervals has 16 times and 12 times of energy respectively in the second and third grades, and the density increases by 2.4%, 19%, 21% and 35% respectively. , 27%, 25%. The change of compactness along the depth mainly occurs in the upper and lower range of 2m.

(8) When the rapid impact compaction machine is tamping, the concrete on the back of the platform mainly produces elastic deformation, and the larger strain force increases slightly with the increase of the tamping frequency, but it does not exceed 10.