What is high energy impact compaction?

High energy impact compaction is a widely used method of subgrade treatment in the world, which has the advantages of simplicity, economy, fast construction speed and good quality. Flood control road engineering has the characteristics of flood control emergency, tight construction time and heavy tasks.

High energy impact compaction and rapid impact compaction are new pavement construction technologies.

Rapid impact compaction is a new construction technology that uses hydraulic tamping machine for high-speed tamping. This technology can adjust the tamping energy according to the actual needs, and has good mobility. It is especially suitable for tamping in the case of narrow working face. At present, many expressways and railways in China have applied this technology in the compaction construction of subgrade joints such as three back backfill, which fills the gap between the original surface compaction technology and dynamic compaction technology.

Its basic working process is to tamp the working surface through the falling of the rammer under the action of gravity and hydraulic pressure. At the same time, the rammer quickly repeats its rising and falling actions under the action of the hydraulic device. The tamping machine realizes the purpose of quickly changing the tamping position through the traction of the supporting device of the loader or excavator, and compacts the subgrade joint such as three back backfill flexibly to improve the overall construction quality of the subgrade, Effectively reduce the post construction settlement of the joint, and make up for the quality defects that large-scale compaction machinery cannot compact in place.

Rapid impact compactor is mainly composed of tamping hammer, tamping plate, tamping frame, electronic control device and hydraulic device. During tamping operation, the tamping hammer is lifted to a certain height by hydraulic device and accelerated to fall under the combined action of hydraulic pressure and gravity. The tamping hammer finally hits the static pressure on the tamping plate with cushion on the working face, and the tamping force of the tamping hammer is transmitted to the soil mass of the working face through the tamping plate to achieve the tamping effect. 

In this process, because all the force of the tamping hammer is to tamp the tamping surface through the tamping plate with buffer pad, and the real-time hydraulic pressure of the tamping still continues to act on the tamping hammer, this tamping technology has the characteristics of long tamping time and small peak force compared with the traditional construction processes such as traditional dynamic compaction and heavy hammer compaction, and will not easily produce shear damage to different filling layers, which can more effectively ensure the compaction effect, At the same time, it can prevent dust and filler splash, and the safety and environmental protection is more prominent. Compared with traditional surface rolling technologies such as roller compaction, rapid impact compaction has strong and uniform penetration ability, which can effectively reduce the surface hardening formed during compaction, make the compaction degree of the subgrade evenly distributed in a greater depth, and achieve better compaction effect.