Application of rapid impact compaction in roadbed, construction technology of rapid impact compactor to reinforce roadbed

In the implementation of the expressway reconstruction and expansion project, there are three design schemes: new section, fully utilized section and wide section spliced on both sides. The construction quality of the splicing width of the subgrade bridge has become the primary task of the success or failure of the entire project.

Faced with the difference in the design value of widening bridges spliced with wide subgrades during construction, the types of high-rise fillers such as new and old subgrades are different. Abutments, culverts, retaining walls and other abutments are filled with narrow working surfaces at the construction site, and it is difficult for general road construction machinery to roll in place. If the compaction quality of these special parts cannot be guaranteed, it will inevitably lead to the difference in the settlement amount of the roadbed after construction, and the quality problems of the back of the abutment or the local settlement deformation. In addition, from the investigation of the reconstruction and expansion road project, it is known that the common diseases of the reconstruction and expansion road are mainly cracks in the horizontal and vertical joints of the road, especially the junction of the old and new roadbeds, which seriously reduces the overall strength and stability of the road, affecting the The use of road design functions. Selecting an economical and feasible pressing technology has become the key to solving the above problems.

After many comparisons, the rapid impact compactor reinforcement method is used as a new type of strong compaction reinforcement method, which can make up for the deficiencies of the existing traditional compaction equipment, and can effectively three backs, fill and excavate joints, new and old road joints, and non-existing road joints. It is convenient or impossible to use road rollers, impact compactors, and strong compaction components, such as multi-distance short-high fill roadbeds, narrow V-ditch and other special terrain roadbeds.

HC series HC36 rapid impact compaction machine is a new generation of electromechanical-hydraulic integrated multi-functional hammering equipment, which can meet the technical performance of most highway production.

The equipment can be used directly with excavators and loaders. The main technical performance and parameters are as follows: HC36 rapid impact compactor has an impact energy of 36 kJ, a hammer weight of 3 tons, a diameter of a ram plate of 1 meter, and a tamping frequency of 30- 80 times, hammer stroke 200-1200mm.

The rapid impact compaction equipment is statically pressed on the soil, and the pituitary body is raised to a certain height and then lowered. After the hammer body descends, the soil is compacted through the buffer force transmission parts and the ramming plate. It is a compaction machine that uses machine gravity and variable force to compress soil. The compaction method of soil by rapid impact compactor can be called dynamic compaction method, which is a compaction process between compaction (deceleration motion) and static (gravity, constant force) compaction. Based on the new technology formed.

It can be seen that the advantages of rapid impact compactors are mainly based on the actual situation of adjacent objects in construction, which can flexibly adjust working parameters, adjust compaction energy, reduce or avoid the impact of construction machinery and equipment on existing structures and old roadbeds, and eliminate combined settlement. The quality risk of deformation, and the design that meets the quality requirements of the overall compaction of the roadbed.