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垫层是路面结构的最底层,起着隔水、防水、传递路面荷载的作用。垫层按使用的材料不同分为砂砾垫层和碎石垫层等,碎石垫层按级配不同可分为级配碎石和未筛分碎石垫层。根据不同公路等级要求选用不同材料及结构类型。级配碎石可用于高等级公路路面基层和垫层,天然砂砾和未筛分碎石垫层一般用于二级和二级以下公路基层和垫层。在垫层施工过程中如果不注意对质量的控制,很容易出现一些常见的病害,如坑槽、翻浆、弯沉达不到设计要求等,不仅给施工企业带来很大的经济损失,也给整个工程带来不利影响。垫层最容易出现的问题就是弯沉达不到设计要求、平整度差等。
Cushion is the bottom of the pavement structure, plays a water, water, the role of road load transmission. Cushion according to the different materials used are divided into gravel cushion and gravel cushion, gravel cushion according to grading can be divided into graded gravel and unscreened gravel cushion. According to the requirements of different road grades choose different materials and structure types. Graded gravel can be used for high-grade road pavement base and cushion, natural gravel and unscreened gravel cushion is generally used for two and below the road base and cushion. If you do not pay attention to the quality control in the process of cushion construction, some common diseases are prone to occur. For example, the design of pits, spatulas and bendings will not reach the design requirements, which will not only bring great economic losses to the construction enterprises, To the entire project adverse effects. Cushion is the most prone to the problem is less than bend design requirements, poor flatness and so on.