At present, rapid impact compactors are mainly used in my country to carry out layered rolling of subgrades that meet the standards, and some of them are used to replace subgrades and weak subgrades. Take the widely used rapid impact compaction machine as an example. When the 3rd gear 6~12 strikes the 96 area to reinforce, the application in various places proves that the effective compaction depth is more than 2m, and the impact depth is more than 6m. According to the verification of most provinces and cities in China, especially the owners, supervisors, and construction parties believe that the test section (compactness degree above 96%) that is reliable and meets the standard shall carry out the reinforcement test, and use the reinforcement test to reinforce the HC36 rapid impact compaction machine. Afterwards, generally the part of settlement 100mm is larger than 2000mm, and a small amount is 50-100mm.

According to the comparison test of the enhancement effect of 11~16t dynamic compactor and rapid impact compaction equipment in some provinces and cities, the enhancement effect (settlement) and productivity of high-speed hydraulic compactor are shown. ) is significantly better than the comparative dynamic compactor.

Based on the application conditions of various places, the rapid impact compaction equipment is flexible and compact, and the compaction strength can be adjusted in a wide range. too low part. The chief engineer of a certain owner in Guangdong is even more precise: China's roads are unqualified, and this equipment is used to solve the problem of unqualified.

At this stage, rapid impact compactors are mainly used for the back of bridges and culverts, the junction of old and new roads, high fill, the junction of fill and excavation, poor soil fill, reinforcement of chicken claw ditch, etc., to replace dynamic compaction, to remedy man-made defects or other defects ( such as flooding in the rainy season, etc.).

The construction parameters shall be determined through the test section. It is generally believed that, in order to properly control the cost, the enhanced settlement of the rapid impact compactor is significantly larger than the post-construction settlement after conventional treatment, or it is expected that no serious illness will occur before the road overhaul.

Take the standard configuration of rapid impact compactor as an example, generally use 3rd gear (1.2m), single point 6 ~ when the back of the bridge and culvert is reinforced, the compaction points are 12 strokes apart, .5m (the edge of the compaction plate is ~0.5m apart), the old and new The ramming points at the road joints are 1~1.5m apart. The linear arrangement of the tamping points can improve the productivity (the so-called plum blossom pile arrangement has no substantial significance to the machine), the parts with excessive settlement should be properly compensated, and the parts with excessive settlement should be excavated and refilled according to the situation or a rapid impact compaction machine should be used to make up. pressure measures. Each filling is about 2 m for reinforcement; the low filling subgrade with better conditions is reinforced at one time after completion. The edge of the rammed plate is mostly 0.1~0.2m away from the front of the bridge and culvert (or use the 2nd gear), and ~0.5m from the eight-character wall, etc., and the 2nd gear is used. After the roadbed surface is reinforced, it is leveled and pressurized. Single-layer or thin-layer stone walls are weak, and rapid impact compaction machine should not be used on the back of high walls.

rapid impact compaction machine is a new type of road machinery, its main function is to improve, compact soil, compact road and foundation. At present, there are three main types of compaction technologies, with different usage scenarios and functions. Below is the difference between the three compaction techniques and how rapid impact compactors work.

In order to achieve adequate compaction and uniform bearing capacity and settlement conditions, there are generally three compaction methods:

1. Dynamic rolling; 2. Deep vibration compaction technology; 3. Deep dynamic compaction (Dynamic compaction).

Soil compaction near the surface usually consists of static or dynamic rollers consisting of different types of exciters and drums. The maximum compaction depth is about 0.2 to 1.0m depending on soil type and roller parameters such as drum dead weight, static line load, drum amplitude excitation frequency, roller speed, etc. Therefore, the depth of soil improvement is limited to relatively low values. By measuring dynamic parameters, the interaction of the drum with the ground during compaction can be controlled. This so-called "continuous compaction control" has proven to be a good compaction technique. Deep compaction is a soil improvement method that has demonstrated the success of dynamic compaction and hydraulic compaction techniques through vibratory shock, typically reaching depths of about 10 to 20 meters, also depending on ground characteristics, compaction equipment and the amount of compaction energy. enter. Since the late 1960s, various natural soils and artificial fillers have been successfully applied throughout the project. The machine is used for heavy-duty compaction (drop weight up to 200 tons, faster falling speed) up to 40 meters, the ground can be improved to 40 meters deep, and the maximum vibration impact depth is 600 tons m. Utilize deep compaction techniques to improve natural soils and man-made fills such as land reclamation. Heavy compaction is primarily useful for intensive, deep compaction of old (municipal) landfills.