旧路改造项目上冷再生机之前，有一个参数建议先确定：再生深度。 这个数字直接决定选什么型号的设备、配多少稳定剂、后续加铺什么结构层。定错了，要么设备干不动，要么再生层强度不够，返工的成本比租金高得多。

Before revitalizing the old road renovation project, one parameter must be determined: the depth of regeneration. This number directly determines what type of equipment to choose, how many stabilizers to use, and what structural layers to add later. Wrong order, either the equipment cannot work or the strength of the regeneration layer is insufficient, and the cost of rework is much higher than the rent.

再生深度由旧路结构决定，不是想定多深就定多深。

The depth of regeneration is determined by the structure of the old road, not by the desired depth.

冷再生的原理是对旧路面进行铣刨、破碎，同时加入稳定剂就地拌合，形成新的基层。再生深度通常覆盖旧路的沥青面层和部分基层。如果旧路是“沥青面层+水稳基层”的结构，再生深度一般控制在15-25cm之间，把沥青面层和上部水稳层一起再生。如果旧路结构层较厚、病害较深，再生深度可能需要延伸到30cm以上。但再生深度不是越深越好——太深了，冷再生机的功率和拌合能力跟不上，拌合不均匀，再生层的强度反而没保证。

The principle of cold recycling is to mill and crush the old road surface, while adding stabilizers and mixing them on site to form a new base layer. The depth of regeneration usually covers the asphalt surface layer and part of the base layer of the old road. If the old road is a structure of "asphalt surface layer+water stable base layer", the regeneration depth is generally controlled between 15-25cm, and the asphalt surface layer and the upper water stable layer are regenerated together. If the old road structure layer is thick and the disease is deep, the regeneration depth may need to be extended to more than 30cm. But the deeper the regeneration depth, the better - too deep, the power and mixing capacity of the cold regeneration machine cannot keep up, the mixing is uneven, and the strength of the regeneration layer is not guaranteed.

设备选型看再生深度和宽度。

Equipment selection depends on the depth and width of regeneration.

国产600、700冷再生机适合县道、乡道等中小型项目，再生深度通常在20cm以内，拌合宽度约2米。进口维特根2500、250S冷再生机功率更大，再生深度可以做到30cm以上，拌合宽度也更宽，适合高速公路、国道改造等大型项目。租赁前把旧路的结构层厚度和需要再生的深度报给租赁方，让对方推荐匹配的机型，比自己拍脑袋选靠谱。

Domestic 600 and 700 cold recycling machines are suitable for small and medium-sized projects such as county roads and township roads. The recycling depth is usually within 20cm, and the mixing width is about 2 meters. The imported Wittgen 2500 and 250S cold recycling machines have higher power, can achieve a recycling depth of over 30cm, and wider mixing width, making them suitable for large-scale projects such as highway and national highway renovations. Before leasing, report the thickness of the structural layer of the old road and the depth that needs to be regenerated to the lessee, and ask them to recommend matching models, which is more reliable than choosing based on one's own judgment.

稳定剂用量跟再生深度直接挂钩。

The dosage of stabilizer is directly linked to the depth of regeneration.

水泥、石灰、泡沫沥青这些稳定剂的掺量，通常是按再生层干重量的百分比来算的。再生深度越深，单位面积需要拌入的旧料越多，稳定剂的总用量也越大。水泥撒布车的撒布量需要根据再生深度、旧料密度和目标强度来调整。撒布不均匀，再生层强度忽高忽低，后期容易局部开裂或沉陷。

The amount of cement, lime, foam asphalt and other stabilizers is usually calculated as a percentage of the dry weight of the recycled layer. The deeper the regeneration depth, the more old materials need to be mixed per unit area, and the total amount of stabilizer used is also greater. The spreading amount of cement spreader needs to be adjusted according to the regeneration depth, old material density, and target strength. Uneven spreading results in fluctuating strength of the regeneration layer, which can easily lead to local cracking or subsidence in the later stage.

再生深度还影响加铺结构。

The depth of regeneration also affects the overlay structure.

冷再生层成型后，上面通常还要加铺新的沥青面层。再生层的强度和厚度，决定了上面能减薄多少。再生层做得好，上面层的沥青厚度可以适当减薄，节省造价。但前提是再生层的压实度和强度达标。压实度不够，上面铺再好的沥青也白搭。

After the cold recycling layer is formed, a new asphalt surface layer is usually added on top. The strength and thickness of the regeneration layer determine how much thinning can be achieved on top. The regeneration layer is well done, and the thickness of the asphalt on the upper layer can be appropriately reduced to save costs. But the prerequisite is that the compaction degree and strength of the regeneration layer meet the standards. The compaction degree is not enough, and even the best asphalt laid on top is useless.

租赁合同里要写清楚的事。

Things that need to be clearly stated in the lease agreement.

除了租金和进出场费，冷再生机出租合同要明确：配套设备谁提供（粉料撒布车、洒水车、压路机）；故障停机怎么算（按台班还是按日历天）；机手经验（有没有同类项目经验）。冷再生施工对含水率控制和拌合均匀度要求高，机手的经验比设备新旧更重要。

In addition to rent and entry and exit fees, the rental contract for the cold recycling machine should specify who will provide the supporting equipment (powder spreader, sprinkler, roller); How to calculate downtime due to malfunction (by shift or by calendar day); Operator experience (do you have similar project experience). Cold recycling construction requires high moisture content control and mixing uniformity, and the experience of the operator is more important than the age of the equipment.

冷再生机出租的选型逻辑很清晰：先确定旧路结构层厚度和再生深度，再选匹配的机型；稳定剂用量按再生深度和旧料密度计算；加铺结构根据再生层强度来定；合同把配套设备、故障停机、机手经验写清楚。再生深度定对了，这笔账才算得清。

The selection logic for renting a cold regeneration machine is very clear: first determine the thickness of the old road structure layer and the regeneration depth, and then select the matching model; The dosage of stabilizer is calculated based on the depth of regeneration and the density of the old material; The overlay structure is determined based on the strength of the regeneration layer; The contract clearly states the supporting equipment, downtime due to malfunctions, and operator experience. Only when the regeneration depth is set correctly can this account be considered clear.

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