旧路改造这件事，传统做法是把破损的沥青面层和基层全部挖掉，运走废料，再拉新料回填，一层一层重新铺。这套流程走下来，工期长、成本高，废弃料堆放和运输还涉及环保问题。这几年就地冷再生技术用得多起来，核心逻辑是在现场直接对旧路面进行铣刨、破碎、拌合、摊铺、压实，一次性完成基层改造，旧料就地利用，省掉了挖运和新料采购的环节。但冷再生机是专用设备，大多数施工队不会自己买，租赁就成了主流选择。

The traditional approach to renovating old roads is to dig up all the damaged asphalt surface and base layers, remove the waste materials, and then backfill with new materials, layer by layer. This process has long construction period, high cost, and involves environmental protection issues in the stacking and transportation of waste materials. In recent years, on-site cold recycling technology has been widely used. The core logic is to directly mill, crush, mix, pave, and compact the old road surface on site, completing the grassroots transformation in one go, and utilizing the old materials on site, saving the links of excavation, transportation, and new material procurement. But cold recycling machines are specialized equipment, and most construction teams do not buy them themselves, so leasing has become the mainstream choice.

先搞清楚冷再生机型号和施工需求的匹配关系。 市面上常见的冷再生机有国产600、700型，也有进口的维特根2500、250S等型号。不同型号的铣刨宽度、工作深度、拌合能力不一样，适配的路面结构也不同。比如县乡道路改造，路面窄、基层薄，中小型冷再生机就够用；高速公路或者市政主干道的大修，路面宽、结构层厚，需要大型冷再生机来保证效率和深度。租赁时要把旧路的结构层厚度、宽度、工程量算清楚，再确定选什么型号，不能到了现场才发现设备能力不够或者大材小用。

First, clarify the matching relationship between the model of the cold recycling machine and the construction requirements. The common cold recycling machines on the market include domestically produced 600 and 700 models, as well as imported models such as the Wittgen 2500 and 250S. The milling width, working depth, and mixing capacity of different models are different, and the suitable pavement structure is also different. For example, in the renovation of county and township roads, with narrow road surfaces and thin base layers, small and medium-sized cold recycling machines are sufficient; The major repairs of highways or municipal main roads require large cold recycling machines to ensure efficiency and depth due to the wide road surface and thick structural layers. When renting, it is necessary to calculate the thickness, width, and engineering quantity of the structural layer of the old road clearly, and then determine which model to choose. It is not advisable to discover insufficient equipment capacity or underutilization only when arriving at the site.

冷再生施工不是租台机器就完事，配套设备要跟上。 冷再生机在现场完成铣刨和拌合，但前面需要粉料撒布车来撒水泥或者石灰，后面需要压路机来突出，中间还要洒水车控制含水量。这些设备如果不同步，冷再生机的效率发挥不出来。比如水泥撒布不均匀，拌合出来的混合料强度忽高忽低；突出不及时，水分蒸发后压实度上不去。租赁冷再生机的时候，非常好把配套设备一起考虑，找能提供整套设备租赁和施工支持的供应商，比单租一台机器省心。

Cold recycling construction is not just about renting a machine, supporting equipment needs to keep up. The cold recycling machine completes milling and mixing on site, but requires a powder spreader to sprinkle cement or lime in the front, a roller to compact it later, and a sprinkler to control the moisture content in the middle. If these devices are not synchronized, the efficiency of the cold regeneration machine cannot be fully utilized. For example, uneven distribution of cement and fluctuating strength of the mixed material; If not rolled in time, the compaction degree will not improve after the water evaporates. When renting a cold recycling machine, it is best to consider the supporting equipment together and find a supplier who can provide complete equipment rental and construction support, which is more convenient than renting a single machine.

含水量控制，是冷再生施工质量的关键变量。 旧路面铣刨后的再生料，含水量受天气和原路面湿度影响很大。含水量太低，水泥水化不充分，强度上不去；含水量太高，突出时容易弹软，成型后收缩开裂。冷再生机上一般配有洒水系统，但操作手要根据现场情况随时调整。济南这边施工旺季在春秋两季，气温合适但风力大的时候水分蒸发快，施工节奏要跟着调整。另外，再生料的级配也要关注，旧路面如果原来就有严重病害或者材料不均匀，再生后的混合料性能也会受影响，必要时需要补充新集料。

Moisture content control is a key variable for the quality of cold recycling construction. The moisture content of recycled materials after milling and planing old road surfaces is greatly affected by weather and humidity of the original road surface. The water content is too low, the cement hydration is insufficient, and the strength cannot be improved; If the moisture content is too high, it is easy to become elastic and soft during rolling, and it will shrink and crack after forming. Cold recycling machines are usually equipped with a sprinkler system, but the operator needs to adjust it according to the on-site situation at any time. The peak season for construction in Jinan is in spring and autumn, when the temperature is suitable but the wind is strong, the water evaporates quickly, and the construction pace needs to be adjusted accordingly. In addition, attention should also be paid to the grading of recycled materials. If the old pavement already has serious diseases or uneven materials, the performance of the recycled mixture will also be affected, and new aggregates need to be added if necessary.

租赁还是包施工，看自己的队伍能力。 有些施工队自己有压路机、平地机这些配套设备，只需要租一台冷再生机，按天或者按工程量结算。有些项目业主或者施工方对冷再生工艺不熟悉，更倾向于把整段旧路改造包给有经验的队伍，材料、设备、施工一起做，省去协调的麻烦。两种模式各有利弊，租设备灵活但需要自己调度，包施工省心但单价可能高一些。选之前评估一下自己队伍的技术水平和设备情况，再决定哪种方式合适。

Whether to rent or contract construction depends on the ability of one's own team. Some construction teams have their own supporting equipment such as rollers and graders, and only need to rent a cold recycling machine, which can be settled on a daily or quantity basis. Some project owners or construction parties are not familiar with the cold recycling process and tend to outsource the entire section of the old road renovation to an experienced team, working together on materials, equipment, and construction to save coordination trouble. Both modes have their own advantages and disadvantages. Renting equipment is flexible but requires self scheduling, while outsourcing construction is worry free but the unit price may be higher. Evaluate the technical level and equipment situation of your team before making a decision on which method is suitable.

冷再生是旧路改造里性价比很高的工艺，但设备选型、配套调度、含水量控制这几件事哪一样没做好，效果都打折扣。租冷再生机之前把工程量和施工条件摸清楚，比到了现场再调整省事得多。

Cold regeneration is a cost-effective process in the renovation of old roads, but if any of the aspects such as equipment selection, matching scheduling, and moisture content control are not done well, the effect will be compromised. Having a clear understanding of the engineering quantity and construction conditions before renting a cold recycling machine is much more convenient than adjusting it on site.

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