The action time is about 20s, and one road section is impacted many times, which has the characteristics of new construction dynamic load.
The construction of impact roller is based on the construction site data monitoring of environmental vibration and earth dynamic pressure formed during the operation of impact rolling construction.
The soil pores are compressed and the soil particles are arranged more closely.
The subgrade vibration intensity is obviously related to the vibration source energy and vibration source distance, and the subgrade vibration parameters are obviously affected by geology Terrain and other factors.
From the perspective of spectrum characteristics, the seismic frequency is between a few hertz, the energy is huge, and the power generated has the greatest direct impact.
In engineering construction, the working efficiency and rolling speed of the impact roller’s impact wheel are several times that of the vibratory roller, which is unmatched by the ordinary vibratory roller.
Therefore, the impact wheel of the impact roller plays a very important role in various construction projects of pavement compaction!..
The subgrade vibration caused by impact rolling of impact roller is similar to blasting, dynamic compaction, pile driving vibration and seismic load.
It is mainly used for small-area foundation tamping.
The tamping method includes many tamping machines, including frog type, vibrating type, jumping type, tamping type and hanging heavy hammer type.
All this load is suddenly released energy and propagates outward from the wave source through the subgrade in the form of wave, resulting in the vibration of subgrade and buildings.
It can be found that the dynamic load caused by impact rolling construction has the characteristics of transient impact.
Therefore, the subgrade vibration caused by impact rolling causes structural resonance and causes much less damage than dynamic compaction and earthquake.
Compared with dynamic compaction, blasting and earthquake, hydraulic compactor construction impact roller has the smallest impact rolling energy and rapid attenuation.
The primary damage area is much smaller than dynamic compaction and blasting (3000kj for dynamic compaction and 30kj for impact rolling), which is smaller than earthquake.
Dynamic compaction construction impact roller impact rolling construction has the characteristics of long duration, with 60m as a direct impact area.
Different types of tamping machines are selected according to the needs of the project, while the tamping machines used in the strong tamping method are mainly high-speed hydraulic tamping machine and heavy hammer dynamic tamping machine.
However, from a similar point of view, the dynamic research methods of dynamic compaction and earthquake can be used for reference.
There are many equipment often used in road construction, including impact roller, dynamic compaction, hydraulic compactor, etc.
The impact and compaction effect on the ground can not be replaced by the general roller.
How does the dynamic load characteristics of impact roller impact rolling construction compare with dynamic compaction and hydraulic compactor? Today, let’s analyze it in detail.
The law of strong tamping is to tamp the soil layer by using the impact force of the free fall of the rammer.
The main frequency of subgrade vibration formed by dynamic compaction is about 2-40hz, The main frequency of subgrade vibration formed by impact rolling is mostly 10-45hz.
When the impact roller is rolling, the impact wheel of the impact roller keeps doing low-frequency jumping movement.
