What are the methods of backfill construction? How does rapid impact compactor work?

With the rapid development of the construction industry in my country, the number of high-rise residential buildings, large-span structures and high-rise buildings is increasing, which provides better regulations for the construction technology and related specifications of engineering buildings. Earthwork construction is a new project with complicated construction technology and high construction difficulty, and the construction time of the new project is long and the project investment is expensive, so it has been concerned by the construction industry. Before the gradual earthwork backfill and backfill construction, all kinds of dirt in the pit and the tank body must be eliminated first, and then the subgrade construction will be gradually filled. If the construction site is a stable hillside, all kinds of dirt on the surface of the soil layer must be properly disposed of, and the construction operation regulations and countermeasures must be improved. When carrying out backfill construction, manual compaction or mechanical equipment compaction is generally selected.

Manual compaction method

If the land area for the construction of the new project is small and the construction industrial equipment is large, so that the backfill cannot be compacted, the manual compaction method must be selected, and the manual assistance method should be adopted to prevent insufficient construction of industrial equipment. If large and medium-sized industrial equipment cannot be constructed, machine equipment can also be selected, such as compactor for backfill compaction. The machinery and equipment can work within the scope of a small total area, which reasonably solves the shortcomings of the construction of the machinery and equipment. Before the construction of the compactor, the backfill must be basically rectified and distributed together. When ramming human resources, it is necessary to strengthen the overall planning. It is best to choose to gradually ram from the surrounding parts of the backfill, and gradually move towards the middle of the backfill. When backfilling the trench excavation, the backfill around the pipeline must be compacted manually first. If the pipeline is intact, the method of backfilling by mechanical equipment can be selected.

Mechanical equipment compaction method

In order to better ensure the uniformity and compactness of backfill compaction, the high efficiency of rolling must be improved. Before the mechanical equipment is rolled, the backfill must first be leveled by a light excavator, and then the sand and gravel in the backfill must be compacted by a vibrating flat roller. solve. When using rolling mechanical equipment to carry out the compaction solution to the backfill, it is necessary to control the traveling speed of the system and control the rolling frequency of the mechanical equipment to prevent adverse effects on the foundation and pipelines, resulting in irreversible damage. When using the flat roller road roller to carry out the compaction solution for the backfill, the standard of "slow filling, slow driving and multi-frequency" must be adopted. Adjust it in the middle of 15-25cm to prevent leakage of pressure. There are areas that cannot be compacted at the backfill edge and the boundary of the slope protection, which must be solved manually or by selecting small and medium-sized compaction machinery. After a layer of rolling compaction, manual methods or small and medium-sized excavators must be used to solve the surface layer of the soil layer.

How rapid impact compactor backfill compaction works

The construction safety distance of rapid impact compactor refers to the distance from the center of the compaction work to the back of the table. The results of back compaction experiments have shown that the spacing is 60cm. The rapid impact compaction machine half diameter is 50cm, that is, the minimum distance between the rammer and the table back is 10cm. The setting method of the rapid impact compaction equipment adopts the plum blossom pile type, the distance between the hammer center and the hammer center is 150cm, and the row height of the two working faces is 50cm.

(1) Before filling the subgrade project, remove the surface soil, tree poles, etc. within the scope of the substrate, and level and compact the substrate with a density of not less than 90%. At the same time, the basic bearing capacity of the substrate is tested, and the places with the basic bearing capacity less than 150kPa must be strengthened;

(2) The filling on the spot is the same as the filling used in the experiment;

(3) The length of the backfill soil at the back of the abutment should not be less than 3 to 4 times the height of the platform;

(4) Use vibratory rollers above 18t to fill in layers beyond 1m around the abutment. The thickness of each layer should not exceed 25cm. Vibration rolling (not less than 8 times) can be used. Carry out negative pressure within 1m (no less than 8 times);

(5) After filling to the relative height of different roadbed projects, use a tamping machine to carry out rib reinforcement, and do corresponding inspections during the whole process of tamping.

In general, in the basic construction process of construction projects, the quality of backfill and rolling work will cause non-negligible harm to the overall quality of the project's capital construction. Construction enterprises should treat the efficacy of backfill and rolling work scientifically and reasonably. In this paper, based on the actual construction of new projects, the selection of earthwork backfill filling materials and backfill construction methods are introduced in detail, and the basis for selection of construction plans and common problems in construction are obtained. Engineering construction enterprises must pay close attention to the backfill and compaction construction, select the appropriate construction plan for the details of the new construction project, and at the same time strengthen the actual construction effect inspection, effectively select the compaction construction technology, and then improve the engineering project. Construction quality.