通过对老路开展取芯和挖探调查并记录取芯及挖探情况，取芯试件试验检测发现，道路整体结构强度不足，路面基层发生较大面积破坏，此路段灾毁恢复重建采用结构性修复以提高路面结构强度，提高道路运行能力。

　　By conducting core and excavation investigations on the old road and recording the results of the core and excavation tests, it was found that the overall structural strength of the road was insufficient, and a large area of damage occurred to the pavement base. The disaster recovery and reconstruction of this section adopted structural repair to improve the strength of the pavement structure and enhance the road's operational capacity.

　　1?技术标准路基横断面形式采用二级公路技术标准。路基宽度16.5?m：断面布置为1.5?m（土路肩）+3.0?m（硬路肩）+3.75?m（行车道）+3.75?m（行车道）+3.0?m（硬路肩）+1.5?m（土路肩）。S26台辉高速立交以南：自上而下采用4?cm细粒式SBS改性沥青混凝土（AC–13C）+改性乳化沥青粘层油+5?cm中粒式SBS改性沥青混凝土（AC–16C）+橡胶沥青纤维碎石封层+乳化沥青透层油+18cm水泥稳定级配碎石+18?cm全深式冷再生（中间7.5?m），总厚度45?cm。

　　1? Technical standard The cross section of subgrade adopts the technical standard of second-class highway. Roadbed width 16.5? m: Is the cross-sectional layout 1.5? M (earth shoulder)+3.0? M (hard shoulder)+3.75? M (lane)+3.75? M (lane)+3.0? M (hard shoulder)+1.5? M (earth shoulder). South of the S26 Taihui Expressway Interchange: adopting a top-down approach of 4? CM fine-grained SBS modified asphalt concrete (AC-13C)+modified emulsified asphalt binder oil+5? Cm medium grained SBS modified asphalt concrete (AC-16C)+rubber asphalt fiber crushed stone seal layer+emulsified asphalt prime coat oil+18cm cement stabilized graded crushed stone+18? Cm deep cold regeneration (7.5 μ m in the middle), with a total thickness of 45 μ m? cm。

　　2?总体思路及技术路线围绕G230通武线内浚界寨外村段灾毁恢复重建工程全深式冷再生下基层的施工，从冷再生设备工作参数匹配控制、再生材料配合比、再生拌和料含水量智能控制、再生混合料的碾压、养护等方面详细论述其施工技术要点。技术路线如图1所示。图1?技术路线

　　2. The overall idea and technical route revolve around the construction of the fully deep cold recycling base layer for the disaster recovery and reconstruction project of the G230 Tongwu Line from the dredging boundary to the village outside the village. The construction technical points are discussed in detail from the aspects of cold recycling equipment working parameter matching control, recycled material mix ratio, intelligent control of recycled mixing material moisture content, rolling and maintenance of recycled mixing material. The technical roadmap is shown in Figure 1. Figure 1? technical route

　　3?关键技术的特点或创新点以往的重建或修复水稳面层都会带来大量建筑垃圾，对环境影响较大，而开发新材料则会减少对资源和环境的损害，因此水稳层采用冷再生施工方法。冷再生使用原有路面的铺层材料，大幅减少了在路面修复或更新时原有铺层材料的施工、使用、废置及新材料采购，不仅可以节约资源，还可以降本增效，所以又被称为绿色施工方法。

　　3. Characteristics or innovation points of key technologies: Previous reconstructions or repairs of water stable surface layers have resulted in a large amount of construction waste, which has a significant impact on the environment. However, the development of new materials can reduce damage to resources and the environment. Therefore, cold recycling construction methods are used for water stable layers. Cold recycling uses the original pavement layer materials, significantly reducing the construction, use, disposal, and procurement of new materials during pavement repair or renewal. It not only saves resources but also reduces costs and increases efficiency, hence it is also known as a green construction method.

　　4?实施方法公路基层全深式就地冷再生施工技术施工工艺流程图如2所示。图2?施工工艺流程

　　4. Implementation method: The construction process flow chart of the fully deep on-site cold recycling construction technology for highway grassroots is shown in Figure 2. Figure 2? Construction process flow

　　4.1?冷再生设备工作参数匹配控制技术目前，国内外冷再生设备的再生鼓一般采用联组三角带定速的皮带传动形式，且刀具切削线速度均为定值。针对不同再生深度，行走速率有所差异，导致再生鼓中水稳层的切削量发生改变，进而导致再生混合材料粒径与层配比例不断波动。冷再生设备的行走速度应根据现场施工试验段、道路结构层施工深度以及再生鼓的运行速度来确定，三项参数应互相匹配；再生混合料筛分应符合图纸的级配要求。通过试验来调整设备行走速度及再生鼓工作转数。在级配范围内，选择中值确定三者工作匹配，以达到就地冷再生工艺下的再生混料所能获得的粒度及拌和均匀度，为再生工艺的级配调节提供较精确信息。

　　4.1? At present, the matching control technology of working parameters for cold regeneration equipment generally adopts a belt transmission form of linked triangular belt with fixed speed for the regeneration drum of cold regeneration equipment at home and abroad, and the cutting line speed of the cutting tool is always a constant value. Due to differences in walking speed for different regeneration depths, the cutting amount of the water stable layer in the regeneration drum changes, resulting in continuous fluctuations in the particle size and layer ratio of the regenerated mixed material. The walking speed of the cold recycling equipment should be determined based on the on-site construction test section, the construction depth of the road structure layer, and the operating speed of the recycling drum, and the three parameters should be matched with each other; The screening of recycled mixtures should comply with the grading requirements of the drawings. Adjust the walking speed of the equipment and the working speed of the regeneration drum through experiments. Within the grading range, the median is selected to determine the best match between the three works, in order to achieve the maximum particle size and mixing uniformity that can be obtained from the recycled mixture under the in-situ cold recycling process, providing more accurate information for the grading adjustment of the recycling process.

　　4.2?再生材料配合比设计施工技术再生层施工前，对原路面材质开展配合比研究，采用冷再生机取样，严格依据标准执行，分析实际结构道路材质、结构种类、塑性指数、击实试验及含水量，从而为实验室配合比研究储备研究样品。水泥稳定再生层中单个粒径尺寸不大于37.5?mm，冷再生混凝土料级配范围也要符合表1。表1?冷再生混合料级配范围对于级配质量不好的原路面结构老料，可掺入新料改良其级配。先依据满足原结构面质量和厚度条件的实验数据来确定掺碎石数量，对所加入的碎石进行筛分，分3个不同粒径等级进行配制。

　　4.2? Design and construction technology for mix proportion of recycled materials Before the construction of the recycled layer, a mix proportion study is conducted on the original pavement material. Cold recycling machines are used for sampling, and the standards are strictly followed to analyze the actual structural road material, structural type, plasticity index, compaction test, and moisture content, in order to reserve research samples for laboratory mix proportion research. Is the maximum size of a single particle in the cement stabilized recycled layer not greater than 37.5? mm， The grading range of cold recycled concrete materials should also comply with Table 1. Table 1? The grading range of cold recycled mixture can be improved by adding new materials to the old pavement structure with poor grading quality. Firstly, based on experimental data that meets the quality and thickness conditions of the original structural surface, determine the amount of crushed stone to be added, screen the added crushed stone, and prepare it in three different particle size grades.

　　按照JTJ?057—94《公路工程无机结合料稳定试验规程》T?0804—94方法确定各种混合料干密度和含水量，根据含水量和计算干密度制备试件进行强度试验。根据设计图纸要求的强度标准，选定合适水泥剂量。通过配合比测量数据测算出每水泥用量，水泥作为再生结合料时，应当使用一般硅酸盐材料，不适宜采用快硬水泥、早强水泥，在冷再生摊铺面上按每袋用量划格，人工摊铺均匀水泥。冷再生机沿摊铺中线拌和，每10~20?m进行挖验，检查是否到底，禁止存在夹层，如不到底及时调整。

　　According to JTJ? 057-94 "Specification for Stability Test of Inorganic Bonding Materials in Highway Engineering" T-0804-94 method determines the maximum dry density and optimal moisture content of various mixtures, and prepares specimens for strength testing based on the optimal moisture content and calculated dry density. Select the appropriate cement dosage according to the strength standards required by the design drawings. The cement dosage per square meter is calculated based on the measurement data of the mix proportion. When using cement as a recycled binder, general silicate materials should be used, and fast hardening cement and early strength cement are not suitable. On the cold recycled paving surface, grid the dosage per bag and manually spread the cement evenly. The cold recycling machine mixes along the centerline of the paving, every 10-20? Conduct excavation inspection to check if it is completely at the bottom, and prohibit the existence of interlayer. If it is not completely at the bottom, adjust it in a timely manner.

　　4.3?再生拌和料含水量智能控制传统冷再生含水量控制，多为在冷再生机进行铣刨、破碎和与集料的拌和时适量加水，在第二次铣刨、拌和时现场检测集料含水量，根据设计图纸要求含水量略大于正确含水量的1?%~2?%，如果含水量缺乏，则水车采用雾状喷头少量喷洒补水。采用单片机控制技术的自动加水装置，通过内置感应器实时监测再生混合料含水率，与同步分比测试资料并实现数据匹配，计算出混合料水分分布比、冷再生机加水量，现场随时补水，实现智能化控制。相比传统施工工艺可减少现场试验时间，进而减少工期。

　　4.3? Intelligent control of moisture content in recycled mixing materials. Traditional cold recycling moisture content control often involves adding an appropriate amount of water during the first milling, crushing, and mixing of the cold recycling machine with the aggregate. During the second milling and mixing, the moisture content of the aggregate is detected on site. According to the design drawings, the moisture content is slightly higher than the correct moisture content by 1? %~2? %If the water content is insufficient, the water truck will use a mist nozzle to spray a small amount of water. The automatic water adding device using microcontroller control technology monitors the moisture content of the recycled mixture in real time through a built-in sensor, matches the data with the synchronous ratio test data, calculates the optimal moisture distribution ratio of the mixture and the amount of water added by the cold regeneration machine, and replenishes water on site at any time to achieve intelligent control. Compared to traditional construction techniques, it can reduce on-site testing time and thus shorten the construction period.

　　4.4?再生混合料的碾压施工技术（1）依据道路的现实路宽、压路机轮宽和轮距差异，汇总出适合于现场的碾压方法，保证冷再生施工面的碾压遍数相同。（2）在完成作业面的初压工序后，采用平地机整平，若表面水分消散较为严重，可在表面适当洒水整平，严禁超载车辆通过，并确保粗细骨料无明确离析现象，采用钢轮震动压路机弱震复压。（3）采用胶轮压路机终压，必要时也可洒水碾压。

　　4.4? The compaction construction technology of recycled mixtures (1) summarizes the most suitable compaction method for the site based on the actual road width, roller wheel width, and wheelbase differences of the road, ensuring that the number of compaction passes on the cold recycling construction surface is the same. (2) After completing the initial compaction process of the work surface, a grader is used for leveling. If the surface moisture dissipates significantly, appropriate watering can be applied to level the surface. Overloaded vehicles are strictly prohibited from passing through, and it is ensured that there is no clear segregation of coarse and fine aggregates. A steel wheel vibratory roller is used for weak vibration re compaction. (3) Finally, a rubber roller is used for final compaction, and if necessary, water can also be sprayed for rolling.

　　4.5?再生混合料的养生施工技术全深式水泥就地冷加工在浇筑完毕后的养护方法和技术如下。水泥冷再生层需经过7??d养护，用土工织物覆盖养护的方法洒水养护。对每次碾压完毕并经过压实度检测合格后的基层，必须采用切断道路交通的方法养护。基层养护时间不得低于7?d。

　　4.5? The curing construction technology for recycled mixtures is as follows: the curing method and technology for on-site cold processing of fully deep cement after pouring are as follows. The cement cold recycling layer needs to go through 7?? D maintenance, using geotextile covering for maintenance and watering for maintenance. After each compaction and passing the compaction degree test, the base layer must be maintained by cutting off road traffic. The grassroots maintenance time shall not be less than 7 days? d。

　　5?结束语与常规的路面养护翻新技术相比，道路就地冷却再生机技术具有众多优势。冷却再生施工采用一次性施工，对道路的破坏较小。全深式冷再生减少了材料运输施工程序，缩短工期，在维修重建养护工程方面具有推广应用价值。

　　Conclusion: Compared with conventional road maintenance and renovation techniques, on-site cooling and regeneration machine technology for roads has many advantages. The cooling and regeneration construction adopts a one-time construction method, which causes less damage to the road. Full depth cold recycling reduces material transportation and construction procedures, shortens the construction period, and has promotion and application value in maintenance, reconstruction, and upkeep projects.

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