Cold regenerator operation:

冷再生机一次破碎拌合宽度为2.4米，工作时需有一辆水罐车紧跟作业保证拌合用水，拌合过程中按照试验单所规定的高于佳含水量1-2%控制用水（前提是需要知道再生机能打开几个水喷嘴来换算含水量），另有一辆水罐车需满水随时处于待命状态，一旦跟再生机作业的水罐没水了，需即刻补上。以保证冷再生机的持续作业能力。冷再生机行进速度应根据路面损坏状况和再生深度进行调整，一般为6m/min～12m/min，使得铣刨后料的级配波动范围不大。网裂严重地段应降低再生机组行进速度，提高铣刨转子转速。如旧路面层结构层厚度大于8cm，冷再生机行走困难，则需先由冷再生机对旧路面层进行铣刨后，在破碎料上再铺水泥，进行冷再生拌合施工。冷再生工作过程中需要人员跟随随时检查拌合深度和湿度，一般以20米一点为准。如有不合格要及时跟司机反映以便解决。每冷再生施工作业时，振动压路机跟在冷再生机后侧20m处，对拌合完的混合料及时采用高幅低频振动碾压一遍，速度等同于冷再生机的行车速度。目的趁佳含水量时把水封在混合料里。

The cold regenerator has a crushing and mixing width of 2.4 meters. During the operation, a water tank truck should follow closely to ensure the mixing water. During the mixing process, the water content should be controlled by 1-2% higher than the optimal water content as specified in the test sheet (provided that it is known that the regenerator opens several water nozzles to convert the water content). Another water tank truck should be full of water and on standby at any time. Once the water tank working with the regenerator runs out of water, it should be immediately replenished. To ensure the continuous operation capability of cold regeneration. The traveling speed of the cold recycling machine shall be adjusted according to the pavement damage and recycling depth, which is generally 6m/min~12m/min, so that the grading fluctuation range of milled materials is small. The traveling speed of the regeneration unit shall be reduced and the speed of the milling rotor shall be increased in the section with serious mesh cracks. If the thickness of the structural layer of the old pavement layer is greater than 8cm, and it is difficult for the cold recycling machine to walk, the cold recycling machine shall first mill the old pavement layer, and then pave cement on the crushed materials for cold recycling mixing construction. In the process of cold regeneration, personnel shall follow to check the mixing depth and humidity at any time, generally subject to 20 meters. In case of any nonconformity, report it to the driver in time for solution. During each cold recycling construction, the vibratory roller shall follow 20m behind the cold recycling machine, and the mixed mixture shall be rolled with high amplitude and low frequency vibration in a timely manner at a speed equal to the driving speed of the cold recycling machine. Aim To seal the water in the mixture when the water content is good.

再生施工时应考虑两种接缝：与道路中心线平行的纵向接缝和与道路中心线垂直的横向接缝。

Two types of joints shall be considered during regeneration construction: longitudinal joints parallel to the road centerline and transverse joints perpendicular to the road centerline.

纵向接缝：再生机的工作宽度一般小于道路或行车道的宽度，因此，全幅路的冷再生需多次作业，从而导致和相邻作业面间的纵向接缝。需要沿整条纵缝有一定的重叠量以保证相邻作业面间纵缝的连续性。相邻作业面间的重叠量不小于10cm。路面越厚，重叠量越大；材料粒径越粗，重叠量越大；相邻两次作业间隔12h以上时，重叠量应增加。在纵向接缝上，根据已建再生层的完成时间，改变水的喷入量。纵向接缝的位置应尽量避开缓慢行驶的重型车辆的轮迹。施工时应通过在现有路面上醒目标志或测量基准线的方法建立导向提示，帮助驾驶员正确操纵再生机，避免相邻作业面间存在未拌合的的夹生带。

Longitudinal joint: the working width of the recycling machine is generally less than the width of the road or carriageway, so the cold recycling of the full width road requires multiple operations, resulting in the longitudinal joint between the adjacent working surfaces. A certain amount of overlap is required along the whole longitudinal joint to ensure the continuity of longitudinal joints between adjacent working faces. The overlap between adjacent working surfaces shall not be less than 10cm. The thicker the pavement, the greater the overlap; The coarser the particle size is, the greater the overlap is; When the interval between two adjacent operations is more than 12h, the overlap shall be increased. On the longitudinal joint, change the water injection amount according to the completion time of the built regeneration layer. The location of longitudinal joints shall avoid the wheel tracks of slow moving heavy vehicles as much as possible. During construction, guidance prompt shall be established by striking signs on the existing road surface or measuring the reference line to help the driver operate the recycling machine correctly and avoid the existence of unmixed sandwiches between adjacent working surfaces.

横向接缝：因每次施工开始或终止而形成的横向接缝是不连续的。每次停机，即使是仅需几分钟用于更换罐车、刀头，也将形成一个严重影响再生材料均匀性的横缝。因此施工中尽量减少停机现象，在不可避免的情况下，应对所形成的横缝进行重叠认真处理。处理横向接缝时需要注意含水量，一般起刀落刀时含水量按正常减半。再生施工开始时，所有开始步骤严格依次进行，特别是水管的排气程序。所有气体在水到达喷洒杆前排除，如果排气不当，有可能在再生施工开始的初几米内，混合料内无水，从而导致路面内出现非稳定路段。在临时停机后重新开始时，整个再生机组应该后退至少一个转子直径的距离既1.5-2米到达再生过的材料上。这将保证开始施工后所有材料均得到处理。停机超过水泥初凝时间，再生机再次施工时，将整个再生机后退至再生过的路段1.5m的距离，并重新撒布水泥。横缝问题只有当施工停止时才会出现。因此，再生机组好只能在罐车用空后或类似情况下才能停机。施工中尽量减少停机现象，好在每打完一段整幅路后再更换刀头，以不影响后续工序的展开。

Transverse joint: the transverse joint formed due to the start or termination of each construction is discontinuous. Every shutdown, even if it only takes a few minutes to replace the tanker and cutter head, will also form a cross seam that seriously affects the uniformity of recycled materials. Therefore, the shutdown phenomenon shall be reduced as much as possible during the construction. If it is unavoidable, the transverse joints formed shall be overlapped carefully. Attention shall be paid to the water content when handling the transverse joints. Generally, the water content shall be halved as normal when the knife is lifted and dropped. At the beginning of regeneration construction, all the starting steps shall be carried out in strict sequence, especially the exhaust procedure of water pipes. All gases shall be discharged before the water reaches the spray bar. If the exhaust is improper, there may be no water in the mixture within the first few meters of the start of regeneration construction, which will lead to unstable sections in the pavement. When restarting after a temporary shutdown, the whole regeneration unit shall back off at least one rotor diameter distance of 1.5-2 meters to reach the regenerated material. This will ensure that all materials are disposed of after the start of construction. When the machine is shut down for more than the initial setting time of cement, the whole machine shall be backed up to 1.5m away from the regenerated road section and the cement shall be spread again. The problem of transverse joint will occur only when the construction stops. Therefore, the regeneration unit can only be shut down after the tank car is empty or under similar circumstances. The shutdown shall be minimized during construction, and the cutter head shall be replaced after each section of the road is completed, so as not to affect the subsequent process.

再生拌和均匀后应色泽一致，没有灰条、灰团和花面，即无明显粗细料离析现象，且水分合适、均匀。每天冷再生施工结束时清洗刀头一定要远离当日施工段的路面进行，以防止洗刀水流入刚打完的路面结构中造成人为软基。

After the regeneration mixing is uniform, the color shall be consistent, there shall be no ash strips, ash lumps and flower surfaces, that is, there shall be no obvious segregation of coarse and fine materials, and the moisture shall be appropriate and uniform. At the end of the cold recycling construction every day, the knife head must be cleaned away from the road surface of the construction section on that day to prevent the knife washing water from flowing into the newly drilled pavement structure to create a soft foundation.