旧沥青路面冷再生机租赁机械如何进行施工呢？在现在道路建设的基础上， 我们有很多公路方面的技术问题需要。现在面临公路运输已呈现出大流量、重荷载的局面。提高公路的使用价值是非常迫切的问题。

How to carry out comprehensive construction of old asphalt pavement cold recycling machine rental machinery? On the basis of comprehensive road construction, we have many technical problems in the field of highways that need to be solved. Now China is facing a situation of high traffic and heavy loads in road transportation. Improving the value of highways is a very urgent issue.

在旧沥青路面改造方面， 河北省邯郸市、廊坊市和石家庄市均先后引进了沥青路面就地冷再生设备， 并进行了大面积的施工尝试， 都获得了很好的经济效益和社会效益。 实践证明， 针对我省的公路现状， 采用就地冷再生施工技术对旧沥青路面进行技术改造是科学可行的。

In terms of the renovation of old asphalt pavement, Handan City, Langfang City, and Shijiazhuang City in Hebei Province have successively introduced on-site cold recycling equipment for asphalt pavement and conducted large-scale construction attempts, all of which have achieved good economic and social benefits. Practice has proven that it is scientifically feasible to use on-site cold recycling construction technology to renovate old asphalt pavement in response to the current situation of highways in our province.

1、就地冷再生的施工原理沥青路面就地冷再生并不是人们通常所理解的将已破损的沥青路面重新恢复到完好的原始状态， 而是将旧面层和部分基层一并打碎混合之后就地改建成新的基层（ 或底基层） 。 严格地讲， 此工艺应该称之为旧沥青路面材料的就地再利用。路面就地冷再生的工作原理， 是在原有旧路铺层的基础上， 按照新的设计要求， 选择性地掺入适量的骨料、水泥、石灰、粉煤灰、乳化沥青、泡沫沥青和水等外加材料， 利用就地冷再生设备，实际上就是一台大型的稳定土路拌机） , 在自然常温下， 就地连续完成对旧铺层（ 路面和部分基层） 的铣刨、破碎、添加料、拌和、摊铺等工序， 随后进行找平和碾压， 终修建出一种特殊级配的道路基层（ 或底基层） 。

1. The construction principle of on-site cold regeneration of asphalt pavement is not commonly understood as restoring damaged asphalt pavement to its original state, but rather breaking and mixing the old surface layer and some of the base layer, and then rebuilding it on site into a new base layer (or sub base layer). Strictly speaking, this process should be referred to as the in-situ reuse of old asphalt pavement materials. The working principle of cold in place recycling of pavement is to selectively add appropriate aggregate, cement, lime, fly ash, emulsified asphalt, foam asphalt, water and other external materials on the basis of the original old pavement layer according to the new design requirements. Using the cold in place recycling equipment, it is actually a large stabilized soil road mixer, Continuously complete the milling, crushing, adding materials, mixing, paving and other processes of the old pavement layer (road surface and some base layers) on site, followed by leveling and rolling, and finally build a special graded road base (or sub base).

2、就地冷再生的适用范围和优点由于就地冷再生施工是将原道路的面层和基层变成了新的道路基层（ 或底基层） , 致使新道路的面层少要在此标高的基础上开始铺筑， 况且在高标准的道路改造中， 有时是将再生层作为底基层， 在此基础上还要加铺二灰碎石等基层材料， 这就使得改造之后的路面标高远远大于原来路面的标高，沿路构造物处路面的设计结构将随之发生变化。如果在城市道路中采用此法施工，原有的排水系统也将随之受到一些影响。 因此， 对于路面标高有较严格限制的道路，不宜采用此法施工。

2. The scope and advantages of on-site cold recycling are due to the fact that on-site cold recycling construction transforms the original road surface layer and base layer into a new road base layer (or sub base layer), which requires the new road surface layer to be laid at least on this elevation. Moreover, in high standard road renovations, sometimes the recycled layer is used as the sub base layer, and on this basis, base materials such as fly ash and crushed stone are also added, This makes the elevation of the renovated road surface much higher than the original elevation, and the design structure of the road surface along the road structure will change accordingly. If this method is used for construction on urban roads, the existing drainage system will also be affected. Therefore, for roads with strict restrictions on road surface elevation, this method should not be used for construction.

虽然就地冷再生的适用范围受到路面标高的限制，但在多数的一般道路改造中，与传统的施工方法相比，依然具有诸多的优点。

Although the applicability of on-site cold regeneration is limited by road surface elevation, it still has many advantages compared to traditional construction methods in the vast majority of general road renovations.

（1）工序简单 由于原有旧路面的材料全部被就地利用， 省略了挖掘6 外运6 厂内加工及回填等一系列工作，使得施工工序大大简化。

(1) The process is simple. Due to the fact that all the materials from the original old road surface are used on site, a series of tasks such as excavation, external transportation, and internal processing and backfilling are omitted, greatly simplifying the construction process.

（2）成本较低 国外的一些施工资料显示，与传统的施工方法相比，由于旧的道路材料得以全部利用，随着再生层厚度的不同，大致可以降低成本 20%~46%。厚度越深，降低成本越多，我国目前在这方面总结的资料还不多，但就从我省对该施工法进行的定额测定结果来看，此工艺能够降低工程成本是肯定的。

(2) According to some construction materials from foreign countries with lower costs, compared with traditional construction methods, due to the full utilization of old road materials, the cost can be reduced by approximately 20% to 46% with different thicknesses of recycled layers. The deeper the thickness, the greater the cost reduction. Currently, there is not much information summarized in this regard in China. However, based on the quota measurement results of this construction method in our province, it is certain that this technology can reduce engineering costs.

（3）提高道路等级 由于该施工法强化了基础的承载能力# 如果新的设计  因为旧料得以全部就地利用，减少了新材料的开采，。也不存在旧料运输和废料随意弃放的问题，施工过程没有粉尘和废气的污染，节约了资源，保护了环境。与传统的施工方法相比，由于旧的道路材料得以全部利用，降低材料采购成本。—施工效率高，工期短，减小交通封闭时间，社会效益明显。由于原有旧路面的材料全部被就地利用，不需要挖掘、外运、厂内加工及回填等一系列工作，使得施工工序简化。

(3) Improving the road grade is due to the construction method strengthening the bearing capacity of the foundation. If the new design utilizes all the old materials on site, it reduces the mining of new materials and saves energy and environmental protection. There is also no problem with the transportation of old materials and the arbitrary disposal of waste materials. The construction process is free from dust and exhaust gas pollution, saving resources and protecting the environment. Compared with traditional construction methods, the use of old road materials reduces material procurement costs High construction efficiency, short construction period, reduced traffic closure time, and significant social benefits. Due to the fact that all materials from the original old road surface are utilized on-site, there is no need for excavation, transportation, factory processing, and backfilling, which simplifies the construction process.

二、沥青路面就地冷再生施工的要求

2、 Requirements for on-site cold recycling construction of asphalt pavement

水泥稳定就地冷再生混合料用做基层或底基层时，水泥剂量可采用4%～5%，一般不宜超过5.5%。水泥稳定就地冷再生结构层宜在春末和气温较高季节组织施工。施工期的日气温应在5℃以上，在雨季施工时，应特别注意气候变化，勿使水泥和混合料遭雨淋。降雨时应停止施工，已经摊铺的水泥混合料应尽快碾压密实。添加的碎石等外掺料和水泥应撒布均匀。当使用大吨位压路机时，压实度宜提高1%～2%。水泥稳定就地冷再生结构层宜采用18t以上的振动压路机碾压。压实厚度15～500px，采用18～20t振动压路机碾压；超过500px以上压实厚度应采用25t以上振动压路机；冷再生结构层碾压工序应在水泥初凝前完成。

When using cement stabilized cold recycled mixtures as base or sub base layers, the cement dosage can be 4% to 5%, and generally should not exceed 5.5%. The cold regeneration structure layer of cement stabilization should be organized for construction in late spring and high temperature seasons. The daily minimum temperature during the construction period should be above 5 ℃. During the rainy season, special attention should be paid to climate change to prevent cement and mixtures from being exposed to rain. Construction should be stopped during rainfall, and the already laid cement mixture should be compacted as soon as possible. The added crushed stones and other additives, as well as cement, should be evenly distributed. When using a large tonnage roller, the compactness should be increased by 1% to 2%. The cement stabilized on-site cold regeneration structure layer should be rolled by a vibrating roller with a capacity of 18 tons or more. The compaction thickness is 15-500px, and 18-20t vibrating rollers are used for compaction; If the compaction thickness exceeds 500px, a vibrating roller of 25t or more should be used; The rolling process of the cold recycled structural layer should be completed before the initial setting of the cement.

三、沥青路面就地冷再生施工施工工艺

3、 On site cold regeneration construction technology for asphalt pavement

1、配合比设计

1. Mix proportion design

在现场再生机按6m/min～8m/min匀速缓慢拌和进行取样，试验室对所取混合料进行筛分，分析混合料级配满足规范级配要求，按5%水泥剂量进行试配强度满足设计需要

Slowly mix at a constant speed of 6m/min to 8m/min in the on-site regeneration machine for sampling. The laboratory screens the selected mixture and analyzes that its gradation meets the specified gradation requirements. The strength of the trial mix is determined to meet the design requirements at a 5% cement dosage

2、施工放样

2. Construction layout

在再生施工之前，应在道路的两侧放置一系列的标桩作为基线，用来恢复道路的中心线。标桩的间距，曲线距离不应超过20米，直线距离不应超过40米。

Before the regeneration construction, a series of stakes should be placed on both sides of the road as baselines to restore the centerline of the road. The spacing between stakes should not exceed 20 meters on curves and 40 meters on straight lines.

3、整理原路面

3. Organize the original road surface

原道路表面的石块、垃圾、杂草等杂物和积水，并清理边线。对原路的翻浆、车辙、沉陷、波浪、坑槽等病害进行处理，使原路基本平整。

Remove debris such as stones, garbage, weeds, and standing water from the original road surface, and clean the edges. Treat the diseases such as mud turning, rutting, sinking, waves, and potholes on the original road to make it basically level.

4、准备新加料

4. Prepare new materials

据原道路再生深度内的平均密度，计算每平米新料的添加量。根据每车料的质量或体积，计算每车料的堆放距离。

Calculate the amount of new material added per square meter based on the average density within the original road regeneration depth. Calculate the stacking distance for each vehicle based on its mass or volume.

5、摆放和撒布水泥

5. Placing and spreading cement

根据计划当日完成工程量及每袋水泥（50Kg）的摊铺面积，计算所需水泥用量，将水泥送撒铺路段，按每延米用量均匀摆放。在工作面用石灰方格网进行标注撒铺，人工将水泥均匀摊开，注意使每袋水泥的撒布面积相等。水泥撒布完后，检查水泥撒布是否均匀。

According to the planned completion quantity on the same day and the paving area of each bag of cement (50kg), calculate the required amount of cement, and send the cement to the paving section, evenly placing it according to the amount per linear meter. Mark and spread with lime grid on the working face, manually spread the cement evenly, and ensure that the spreading area of each bag of cement is equal. After the cement is spread, check if the cement is evenly distributed.

6、冷再生机铣刨与拌和

6. Cold regeneration machine milling and mixing

冷再生机推动稀浆车或水车在原路面上行进。施工中再生深度的检查以相邻已经再生或原路面为标准，用钢纤刺入土中，测量其刺入深度，看其深度是否合格。再生机后宜安排4～5人处理边线和清理混合料中的杂质以及每刀起始位置的余料，以防止影响纵向接缝、横向接缝、平整度和再生材料的密实性。带有熨平板的再生机，应经常检查熨平板后混合料的厚度。

The cold regeneration machine drives the slurry truck or water truck to move on the original road surface. The inspection of the depth of regeneration during construction shall be based on the adjacent regenerated or original road surface. Steel fibers shall be inserted into the soil, and the penetration depth shall be measured to see if it is qualified. After the regeneration machine, it is advisable to arrange 4-5 people to handle the edges and clean the impurities in the mixture, as well as the remaining materials at the starting position of each blade, to prevent affecting the longitudinal and transverse joints, flatness, and compactness of the recycled material. A regeneration machine with an iron plate should regularly check the thickness of the mixture after the iron plate is pressed.

7、整平碾压

7. Leveling and Rolling

冷再生机拌和完成后，用J20振动压路机进行初压，施工人员根据测量结果指挥平地机进行整平。碾压过程中始终保持表面湿润，禁止在已碾压的路段上调头或急刹车。从加水拌和到碾压终止的时间不得超过使用水泥的初凝时间。

After the cold regeneration machine is mixed, the J20 vibrating roller is used for initial compaction, and the construction personnel command the leveling machine to level based on the measurement results. During the rolling process, always keep the surface moist and do not turn around or brake sharply on the road section that has already been rolled. The time from mixing with water to the end of compaction shall not exceed the initial setting time of the cement used.

8、养生及交通管制

8. Health and traffic control

碾压成型并检测合格后进行不少于7天养生，水泥稳定就地冷再生层宜养生7天后铺筑上层混合料。除洒水车外，应封闭交通。不能封闭交通时，应限制重车通行。

After rolling and passing the inspection, the concrete should be cured for no less than 7 days. The cement stabilized cold recycled layer should be cured for 7 days before laying the upper layer mixture. Except for sprinkler trucks, traffic should be closed off. When traffic cannot be closed, heavy vehicles should be restricted from passing.

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