update time：2022-11-02 15:06:53
Rapid Impact Compaction is a kind of compaction machine that uses the combined force of machine grav...
Rapid Impact Compaction is a kind of compaction machine that uses the combined force of machine gravity and hammer body to compress soil. According to the structural characteristics of the Rapid Impact Compactor, it can be classified as a tamping machine. According to its action on the ground, the Rapid Impact Compactor belongs to a dynamic compaction machine.
Technical Principle of Rapid Impact Compactor
The technical principle (compaction mechanism) of the Rapid Impact Compaction is the dynamic compaction method, referred to as "dynamic compaction method".
Dynamic compaction is to apply greater dynamic force to improve the compaction effect on the basis of static (also known as gravity) compaction; Rapid Impact Compaction is a typical characteristic of large impact and fast attenuation when the hammer directly strikes the ground at the maximum speed.
Dynamic compaction uses the combined force of variable force and machine gravity to compress the soil. Both dynamic compaction and compaction have impact, but dynamic compaction accelerates from static state, the peak value of impact force is much smaller and lasts for a long time. Impact compaction impacts the ground at the maximum speed, and the peak value of impact force is much larger and decays quickly. If the compaction method is used to reinforce and roll the abutment back or formed subgrade up to the standard, the strong shear of the hammer on the soil will destroy the soil structure; When the front face of the hammer compresses the soil at a high speed, it also compresses the soil at a high speed to the surrounding area, generating strong shear waves and large destructive force.
Technical advantages of Rapid Impact Compactor
The resistance (bearing capacity) of subgrade soil mass increases continuously during compaction, and three conditions must be met for continuous compaction of soil mass:
Sufficient force Considering the rapid attenuation of force in non rigid objects, the force per unit area (pressure, pressure) must be significantly greater than the soil deformation resistance.
Sufficient energy, displacement of soil particles and extrusion deformation need to consume energy. The compaction equipment must release enough energy (effective work) to the compressed soil within the required time, rather than how much energy the compaction equipment has.
Sufficient action time The movement of soil particles after being stressed, the transfer of force to the deep layer, and the release of energy all require an appropriate action time cycle, and it also requires time to resist the elastic recovery of soil particles after compression.
The reason why the roller can only be used for thin layer and surface layer compaction is that it does not have enough time and energy to affect the deep layer during its walking operation. Why is the dynamic compactor with huge impact force and energy inferior to HC36 Rapid Impact Compactor in the comparative test? This is because when facing the hard ground, the heavy hammer of the dynamic compactor hits the ground at the maximum end speed at high speed, and the heavy hammer bounces when it lands. The peak force is large, the attenuation is fast, and the action time is short. The huge energy is not fully released on the soil.
The fundamental difference between Rapid Impact Compaction and dynamic compactor is that a lower hammer body and a tamping plate assembly with greater inertia are set between the heavy hammer and the soil mass to convert the impact energy into pressure energy, and the grounded tamping plate accelerates from zero to the highest point and then gradually decays. The peak value of the force is small, the action time is long, and the energy is fully released. It is not easy to produce shear wave (horizontal wave, shear wave) when compacting the soil foundation, which is a non rigid body with low hardness. Therefore, the Rapid Impact Compaction can be close to most highway structures (such as abutments) to compress thicker soil. The high frequency continuous action of the Rapid Impact Compaction on the soil makes the compressed soil tend to be stable.
The structural form and technical characteristics of the Rapid Impact Compactor determine that the product has the function of compressing the subgrade soil with high strength, and the ability to adjust the working parameters in a large range determines that the product can adapt to the treatment requirements of different parts of the subgrade and different filling stages. The Rapid Impact Compactor meets the above three essential conditions, and has significant advantages in expressway subgrade reinforcement and treatment of special parts.
In a word, Rapid Impact Compaction plays a very important role in highway construction. Its technical principle and advantages can better meet the conditions and requirements of highway compaction, and it is also a new type of construction machinery with promotion value and significance.