In spring, when the flowers are in full bloom, there are many people in various parks. I wonder if you noticed that there are square pavement tiles in each park. So, do you know the construction technology of square pavement?
Subgrade excavation: According to the requirements of the plan, the roadbed is excavated, the earthwork is cleared, and the planned elevation is reached; check whether the longitudinal slope, cross slope and sidelines meet the planning requirements; trim the subgrade, level the compaction, and compact the compaction coefficient to 95 % And pay attention to buried pipelines.
Cushioning: 120mm thick 3: 7 lime soil layer, large and medium-sized vehicle lanes, 200mm thick 3: 7 lime soil layer, and leveling compaction, compactness, more than 95%.
Bottom laying: 120mm thick 3: 7 lime soil or 100mm thick gravel on sidewalks and garden roads, and leveled and compacted, with a density of more than 95%. 150mm thick inorganic bonding material to stabilize the granular cushion layer (or 150mm thick graded sand and gravel, the maximum particle size must not exceed 60mm, and the minimum particle size must not exceed 0.5mm), and large and medium-sized vehicle lanes should be 300mm thick. The inorganic bonding material stabilizes the granular cushion layer and smoothes the layered compaction, and the compactness is above 95%.
Laying of the screed layer: The screed layer is made of medium sand, 30mm thick. The medium sand requires a certain gradation, that is, the gradation sand with a particle size of 0.3-5mm is leveled.
Surface layer laying: The surface layer is pavement tiles. When laying, the pavement tiles should be laid according to the plan drawing. When laying, it should be laid flat and beaten with a rubber hammer, but the corners of the brick must not be damaged. The quality requirements meet the interlocking. CJJ79-98 rules for pavement construction and acceptance of type pavement bricks. The minimum thickness of sidewalk and square pavement bricks is 60mm, and the minimum thickness of small car road surface bricks is 60mm-80mm.