Application of Rapid Impact Compaction in road subgrade

Abutment back culvert side reinforcement operation

With the rapid construction of highways in China, drainage projects, especially tunnel structures, have been greatly improved, in China's current construction technology, the cover plate culvert back, the culvert side retaining wall wall back of the filling is completed after this structure, in the filling, both to ensure that the structure is not destroyed, but also need to have sufficient compaction, because here is relatively narrow, large and medium-sized compaction machinery operation is not convenient, small and medium-sized compaction machinery and equipment is also difficult to achieve the required compactness, so the project construction difficulties are relatively large. Because of its maneuverability and controllable ramming kinetic energy, Rapid Impact Compactions are especially suitable for such narrow and large areas of compaction operation regulations.

Fill in the high fill in the roadbed reinforcement operation

The stone filling subgrade should ensure the density, symmetry and stability, and the difficulty coefficient is very large, such as the lack of excellent mix ratio of sand and gravel materials is not easy to roll the compactness, and in the steep slope valley area with more complex terrain, the relative height difference between the filling of the stone subgrade on the same section is relatively large, the substrate work surface is not easy to produce and the filling layer is too thick, the middle of the block stone is not easy to lock closely, so that the point surface between the material and stone is more touching and very easy to loosen. In this kind of high-filled roadbed, filling and digging junction engineering construction surface, Rapid Impact Compaction is selected to carry out tamping operations, which can achieve better practical results of compaction. Especially in some mountainous areas, the construction sidewalks are difficult, and the construction conditions with narrow working surfaces can better reflect the advantages of Rapid Impact Compactions.

Soil layer filling and excavation road operations

Rapid Impact Compaction is used in soil subgrade with remarkable results. The maximum dry density of the backfill soil was 1.86g/cm, the best moisture content was 12.6%, and the apparent density of the original soil on the surface of the excavation section was 1.53g/cm. 6 hammers, 12 hammers and 18 hammers are operated in strong gears, and settlement observations and compactness tests are carried out at the same time.