Grade 2 and below and the laying of low-grade road in the steep hillside section of the construction of particularly difficult or a large number of blasting to move digging for filling, can be used to fill the way to fill, but the road bed is not less than 1.0m range Should be layered filling compaction. Gravel embankment of expressways, first-class highways and other grade roads with high-grade pavement shall be filled with layers, and shall be stratified and compaction. The thickness of layers shall be determined according to the type of rocks. Thickness of loose pavement can be selected according to Table 2. As can be seen from the table, the hardest rock crushed stone embankment of the largest loose thickness of about 60cm in general, the maximum particle size does not exceed the layer thickness of 2/3, that is not more than 40cm. Soft rock uniaxial saturated compressive strength should not be less than 15MPa. Otherwise, the CBR test should be carried out, CBR not less than 15%, should avoid the use of expansive mineral composition of shale, soluble rock, rock and rock. At the construction site, should be full-time staff on the loose thickness and the maximum size of the inspection, found that ultra-grain gravel should be timely solution and removal of small.
Small Road Roller - Shanghai Doan Machinery Technology Co.,LtdFor different types of rocks or lithological differences in the larger stone, should be different rock types, different lithological stone layering, sub-filling, the filling layer thickness and compaction control standards are also different. Compaction quality standards should adopt the difference of compaction settlement or porosity as the control index.
The use of bulldozers or loaders paving and leveling, should try to use "into the type" paving method, the first section of the road from the filling material, with bulldozers opened leveling, control the thickness of its loose pavement construction requirements; As the basis for the material poured into the loose layer with a bulldozer on the material gradually move forward, so that the filler can continue to roll fall, aniseed in the next, filled with small and medium material in the aniseed to form a more balanced and stable material layer structure , At the same time to avoid the paving process, the separation of coarse and fine materials, all the fine material to the paved layer of the phenomenon of precipitation. Ensure that the largest stones should be at the bottom of each layer, that the finer particles are at the top and fill the voids during the filling period to ensure optimum crowding and pressure transmission while providing a roller that will not be damaged when the roller is running Of the compacted surface. Artificial laying of stones larger than 33cm in diameter, should be paved with large stone, large face down, small face up, put stability, and then a small stone leveling, stone debris seams, the final compaction. Bulldozers paving is completed, the paving surface of the prominent rock, bumpy parts, should be manually cleared and smooth. When the laying of geosynthetics, the face should be prohibited to vehicular traffic, backward paving leveling. Avoid the construction machinery rolling geotextile.
When the packing gradation is poor, when the gap between stones is large, a small amount of fine material can be filled on each surface to fill the gap between stones. When paving, the heavy construction machinery has coarse compacting and crushing Role, is conducive to further compaction compact compaction machinery.
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Topic: Paving and leveling technology of crushed rock fill (Read 765 times)
