交底内容：
1、在铺筑级配碎石底基层（垫层）前，应从填筑好的路基上将所有浮土、杂物清除干净，并严格整形和压实使其符合设计图纸要求。
2、路床表面上的车辙或松软部分和压实不足的地方以及任何不符合规定要求的表面都应翻松、清除或掺填同类材料重新进行整修碾压，使其达到本标段技术规范的相关技术要求。
3、 施工前对路基进行复验，同时保证路基排水设施的完好。
4、 恢复中线测量：直线段每20～25m设一桩，平曲线每10～15m设一桩。
5、碾压：采用12T以上压路机碾压，碾压方向均应与中心平行，其碾压顺序一般是:直线段由边到中，超高段由内侧向外侧，依次连续均匀进行碾压。碾压时，后轮重叠1/2轮宽，使每个摊铺碾压层整个厚度和宽度完全均匀地压实到规定的压实度为止。压实后表面平整、无轮迹或隆起，并有正确的断面和适当的路拱。压实机碾压速度的控制，头两遍以采用1.5～1.7Km/h为宜，以后用2.0～2.5Km/h。压路机压不到的地方，用机夯实直到达到规定的密实度为止。
7、碾压后垫层表面应平整、坚实、无粗细料局部集中现象，碾压轮迹深度不得大于5mm。否则已施工的碎石垫层需再次碾压到设计要求为止。
Cards on the table contents:
1 graded gravel in the pavement sub-base (cushion) before, we should start filling all surface dust will be a good foundation, debris cleared away, and shaping and compaction to meet stringent design requirements of the drawings.
2, road bed surface rutting or soft parts and compaction deficiencies and does not meet the requirements of any surface should be turned loose, clear or mixed with similar material to re-fill the renovation rolling, to achieve the technical specification of the tenders the relevant technical requirements.
3, before the construction of the roadbed for retesting, while ensuring good subgrade drainage.
4, restoration of midline measurement: 20 ~ 25m straight line set up one of each, every 10 ~ 15m horizontal curve set 1.
5, RCC: RCC with 12T or more rollers, rolling direction should be parallel with the center, the RCC is generally the order: straight line from the edge to their middle and high section from the medial to lateral, followed by a continuous and even to grind Pressure. RCC, the rear overlap 1 / 2 wide, so that the whole thickness of each layer of paving and compaction and compaction width completely evenly up to the required degree of compaction. After compaction the surface smooth, no wheel track or uplift, and the correct and proper camber section. Compactor rolling speed control, head twice to use 1.5 ~ 1.7Km / h is appropriate, after using 2.0 ~ 2.5Km / h. Roller pressure less than the local, with machines up to achieve the required compaction density far.
7, after the cushion surface should be smooth rolling, solid, non-weight material of local concentration, the depth of compacted wheel tracks no larger than 5mm. Otherwise have been required to re-construction of the gravel bedding layer compacted to the design requirement.