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小解公路路面施工問題

'小解公路路面施工問題'
?小解公路路面施工問題1. treatment measures of segregation in asphalt pavement constructionIn the construction of high grade highway pavement, the segregation phenomenon of asphaIt concrete during paving is very serious? Segregation of asphalt surface layer is not unifomi mixture of coarse and fine aggregate and asphalt content, coarse aggregate position gap focus rate is too large, the asphalt content is low, in the use stage prone to water damage, the formation of pits and loose phenomenon; and the fine aggregate content of asphalt is more concentrated area, porosity is too small, it will cause the problem of pavement upheaval, rutting and bleeding etc??1. 1 if the asphalt mixer or local vibration sieve rupture, will make the mixture mixed with some more specifications of large diameter aggregate, must always check replacement?1. 2, in mixing site selection, try to make mixing site and paving site distance is not too far? At the same time, should be appropriate to reduce speed, smooth transportation, the transportation process, to minimize turbulence; to stockpile insulation measures should be taken, such as to cover tarpaulin etc??1. 3 in the assembly process of Paver Screed, first pay attention to the bottom surface of the joint is smooth, whether front flush, bottom plate, tamping hammer head and blade wear deformation; secondly, to pay attention to the material distribution helix near the middle part and the connecting part is reverse leaves, because the majority of segr-省略部分-rolled, so as to reduce the fluctuation of the coefficient of compaction. Check whether the vibration system and leveling system are normal and preheat the screed?2. 1 paving, using the ^reference wire method" in leveling, paving the sidelines about 20cm into the solid support rod, the support rod according to the pile spacing of 10m, located in middle and lower layer top design level with a constant elevation of stee1.The length of the laying of 2. 2 benchmark steel wire is about 300m? When the length of steel wire is 200 to 250m, the tension should be 100、130KN. When the length of steel wire is between 250 and 300m, the tension should be 150 ~ 200KN;The maximum deflection of the datum steel wire within 10m shall not exceed 2mm, and the supporting rod shall be supported if necessary.2. 3 support struts shall be used before and after the curve radius is small or near or near the side of the slope?2. 4, support rod and benchmark steel wire erection elevation, after checking correct, can begin paving, in the course of laying, site should be checked back and forth, to prevent vehicles, construction workers and mechanical collision support rod or wire?3. treatment measures of joints in asphalt pavement constructionThe road construction joints are divided into longitudinal and transverse joints? Longitudinal seam is mainly for the entire road surface can not be paved at the same time, while the transverse joint is because the paver is lifted and re homing will occur.
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路面 施工 問題 公路 小解
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