合松通项目四工区水泥稳定土施工经验，针对粉料撒布车和冷再生拌和机在水泥稳定土施工中的配套应用，具体阐述了粉料撒布车和冷再生拌和机配套使用的施工原理、特点及适用范围。并将其与人工撒布水泥加传统拌和机的组合在施工参数、施工质量、经济效益和社会效益等4个方面进行比较，计算实际节省成本，选择最优化施工方式，对今后同类工程具有参考作用。关键词水泥稳定土?|?粉料撒布车?|?人工撒布?|?冷再生拌和机?|?施工工艺?|?施工成本松通项目四工区在水泥稳定土施工过程中，传统人工撒布水泥加路拌机拌和方式已经不能满足实际施工需求，参考境内的一些先进施工方式，并结合自身需求，引进了一台国产20t粉料撒布车及一台德产维特根WR250冷再生拌和机。通过实际施工数据总结，将机械撒布水泥、冷再生拌和机组合与人工撒布水泥、传统拌和机组合进行对比，发现机械撒布水泥、冷再生拌和机在施工效率、节约成本、保护环境等方面都比传统拌和更有优势。将这一施工方式应用在松通项目四工区31.6km高速公路建设工程中，取得了良好的使用效果。

　　Based on the construction experience of cement stabilized soil in the fourth work area of the Hesongtong project, this article elaborates on the construction principles, characteristics, and scope of application of the combination of powder spreading vehicles and cold recycling mixers in the construction of cement stabilized soil. And compare it with the combination of manual spreading cement and traditional mixer in four aspects: construction parameters, construction quality, economic benefits, and social benefits. Calculate the actual cost savings, select the optimal construction method, and provide reference for similar projects in the future. Keywords cement stabilized soil? |Powder spreading truck? |Manual spreading? |Cold recycling mixer? |Construction technology? |In the construction process of cement stabilized soil in the fourth work area of the Songtong project, the traditional manual spreading of cement and road mixing machine mixing method can no longer meet the actual construction needs. Referring to some advanced construction methods in China and combining with our own needs, we have introduced a domestically produced 20t powder spreading vehicle and a German made Wirtgen WR250 cold recycling mixer. By summarizing actual construction data, a comparison was made between the combination of mechanical spreading cement and cold recycling mixer and the combination of manual spreading cement and traditional mixer. It was found that mechanical spreading cement and cold recycling mixer have advantages over traditional mixing in terms of construction efficiency, cost savings, and environmental protection. The application of this construction method in the construction of the 31.6km expressway in the fourth work area of the Songtong project has achieved good results.

　　实际研究表明，将粉料撒布车与冷再生拌和机搭配应用到水泥稳定土施工中，是一项切实可行、有广阔发展前景的施工方式。概况介绍松通项目四工区起讫桩号为K99+000~K130+603.691，全长31.604km，连接线长度为12.610km；合同总造价为14.6亿元人民币，包含路基、路面、桥涵(大桥1031m/3座，中桥67m/1座，分离式立交1235m/3座，通道231m/11座，天桥1109m/10座，箱涵49道)、交叉工程(互通式立体交叉3处)、服务区(1处)、环保绿化等分项工程。

　　Practical research has shown that the combination of powder spreading vehicles and cold recycling mixers in the construction of cement stabilized soil is a feasible and promising construction method. Overview: The starting and ending pile numbers of the fourth work area of the Songtong project are K99+000~K130+603.691, with a total length of 31.604km and a connecting line length of 12.610km. The total contract cost is 1.46 billion yuan, including roadbed, pavement, bridges and culverts (3 large bridges of 1031m, 1 medium bridge of 67m, 3 separated overpasses of 1235m, 11 passages of 231m, 10 overpasses of 1109m, and 49 box culverts), intersection engineering (3 interchanges), service area (1), environmental protection and greening, and other sub projects.

　　以水泥搅拌桩段落30cm厚水泥稳定土为例，普通路拌机最大虚铺拌和深度不大于25cm，则水泥搅拌桩桩顶水泥土褥垫层需分两层施工，每层水泥稳定土压实厚度为15cm，压路机施工对已成型的水泥搅拌桩桩头质量破坏较大。为保证施工质量，加快施工进度，松通项目四工区引进了20t粉料撒布车与维特根WR250冷再生拌和机进行水泥稳定土配套施工，并取得了良好效果。水泥稳定土施工工艺施工工艺流程水泥稳定土施工工艺流程见图1。施工操作要点(1)测量放样。测设中桩，直线段每20m设一桩，平曲线段每10m设一桩，并在两侧路肩边缘外设指示桩，见图2。在指示桩上用明显标记标出水泥土边缘的虚铺高度。(2)土方摊铺。原地面、水泥搅拌桩、砂砾换填验收合格后，恢复中桩和两侧边桩，检测基底高程，在基底上用石灰线画出中线、边线和布土方格(图3)。根据实测虚铺系数计算虚铺厚度，压实厚度按照20cm控制。根据运土车大小，计算布土方格尺寸。(3)整平。推土机粗平后做出标高控制点，然后用平地机精平，整理出路拱和横坡，见图4。整平后要及时检测素土的含水量，按比最佳含水量高出2%控制。随后检测土的含水量是否均匀并符合要求，合格后进入下道工序。当含水量过低时，采用水车补水调整。当含水量大时，需翻开晾晒。(4)撒布水泥。采用粉料撒布车进行水泥撒布，见图5。撒布前需要根据水泥剂量计算出每平方米的水泥撒布量，然后只需驾驶员在车辆控制器中输入每平方米的水泥撒布量和撒布宽度即可。输入后，车辆控制系统自动计算出相关参数并开始均匀撒布。(5)拌和。水泥撒布完成后采用冷再生拌和机拌和，见图6。从两侧向中间方向进行拌和，拌和速度为1~3.3km/h，拌和次数不少于1次，直到翻拌均匀为止。翻拌过程中，应安排人随时检查翻拌深度是否满足要求。翻拌完成后检查含水量，如果含水量满足要求，混合料色泽均匀一致，没有灰条、灰团和花面，没有粗细颗粒“窝或带”就算拌和合格。同时采用EDTA滴定法快速测定水泥剂量。若水泥量不足，应补撒水泥，重新滴定直至水泥剂量满足大于等于4%的要求，然后重新拌和至符合要求。拌和过程中，及时检查混合料的含水量。含水量宜略大于最佳含水量1~2个百分点。如果混合料的含水量不足，利用洒水车洒水润湿。

　　Taking the 30cm thick cement stabilized soil section of the cement mixing pile as an example, if the maximum virtual mixing depth of the ordinary road mixer is not greater than 25cm, the cement soil cushion layer on the top of the cement mixing pile needs to be constructed in two layers, with each layer of cement stabilized soil compacted to a thickness of 15cm. The construction of the roller will cause significant damage to the quality of the already formed cement mixing pile head. To ensure construction quality and accelerate construction progress, the fourth work area of the Songtong project has introduced a 20t powder spreading truck and a Wirtgen WR250 cold recycling mixer for cement stabilized soil matching construction, and achieved good results. The construction process of cement stabilized soil is shown in Figure 1. Key points of construction operation (1) measurement and layout. Set up center stakes, with one stake every 20m for straight sections and every 10m for flat curved sections, and set up indicator stakes on both sides of the shoulder edges, as shown in Figure 2. Clearly mark the virtual paving height of the cement soil edge on the indicator post. (2) Earthwork paving. After the acceptance of the original ground, cement mixing piles, and gravel replacement, restore the center piles and side piles, check the elevation of the foundation, and draw the center line, edge line, and soil grid on the foundation with lime lines (Figure 3). Calculate the virtual paving thickness based on the measured virtual paving coefficient, and control the compacted thickness at 20cm. Calculate the size of the soil grid based on the size of the earthmoving truck. (3) Leveling. After rough leveling with a bulldozer, establish elevation control points, and then use a grader for precise leveling to organize the road arch and cross slope, as shown in Figure 4. After leveling, the moisture content of the plain soil should be detected in a timely manner, and controlled to be 2% higher than the optimal moisture content. Subsequently, check whether the moisture content of the soil is uniform and meets the requirements. After passing the inspection, proceed to the next process. When the moisture content is too low, use a water truck to replenish water for adjustment. When the moisture content is high, it needs to be opened and dried. (4) Spread cement. Cement spreading is carried out using a powder spreading vehicle, as shown in Figure 5. Before spreading, the cement spreading amount per square meter needs to be calculated based on the cement dosage, and then the driver only needs to input the cement spreading amount and width per square meter in the vehicle controller. After input, the vehicle control system automatically calculates the relevant parameters and begins to evenly distribute. (5) Mixing. After the cement spreading is completed, it is mixed using a cold recycling mixer, as shown in Figure 6. Mix from both sides towards the middle, with a mixing speed of 1-3.3km/h, and mix at least once until the mixture is evenly turned over. During the mixing process, personnel should be arranged to check at all times whether the mixing depth meets the requirements. After the mixing is completed, check the moisture content. If the moisture content meets the requirements, the color of the mixture is uniform and consistent, there are no gray bars, gray clumps, or flower surfaces, and there are no coarse or fine particle "pits or bands", the mixing is considered qualified. Simultaneously, EDTA titration method was used to rapidly determine the dosage of cement. If the cement content is insufficient, additional cement should be sprinkled and titrated until the cement content meets the requirement of 4% or more, and then re mixed until it meets the requirements. During the mixing process, check the moisture content of the mixture in a timely manner. The moisture content should be slightly higher than the optimal moisture content by 1-2 percentage points. If the moisture content of the mixture is insufficient, use a sprinkler truck to wet it with water.

　　(6)压实。水泥土拌和均匀后，用压路机立即在基面上快速碾压一遍，以暴露潜在的不平整，见图7。然后再用平地机精平一次。每次整平都按照精平要求进行。需特别注意接缝处的整平，使接缝顺适平整。整型后，用压路机(22t)在填筑全宽内相邻交错排列，由两侧向中线纵向进退式碾压。碾压时，重叠1/2轮宽，后轮超过边线。在头两遍时压路机的碾压速度采用1.5~1.7km/h，以后采用2.0~2.5km/h。

　　(6) Compaction. After the cement soil is mixed evenly, a roller is immediately used to quickly roll it on the base surface to expose potential unevenness, as shown in Figure 7. Then use a grader to level it again. Each leveling is carried out according to the requirements of precision leveling. Special attention should be paid to the leveling of the joints to ensure smooth and even seams. After shaping, use a 22t roller to arrange adjacent and staggered rows within the full width of the filling, and roll longitudinally from both sides to the centerline. When rolling, overlap by half the width of the wheel and the rear wheel exceeds the edge line. The rolling speed of the road roller is 1.5~1.7km/h in the first two passes, and 2.0~2.5km/h thereafter.

　　碾压原则为先两侧后中间，先慢后快、第一遍静压、第二遍弱振、第三遍强振并检测高程和压实度、第四遍强振并检测高程和压实度，直到压实度符合设计要求，最终静压消除表面轮迹印。

　　The compaction principle is to start from both sides and then the middle, slow down first and then fast. The first layer is static pressure, the second layer is weak vibration, the third layer is strong vibration and elevation and compaction degree are tested, and the fourth layer is strong vibration and elevation and compaction degree are tested until the compaction degree meets the design requirements. Finally, static pressure eliminates surface wheel marks.

　　(7)试验检测。水泥稳定土碾压完成后，先进行自检，见图8。自检合格后，报总监办及中心实验室检测。经检测合格后方可进行下一步工序施工。(8)养生。每一段水泥稳定土碾压完成并经压实度检查合格后，应立即开始养生且养生期不少于7d。整个养生期间应保持稳定土层表面润湿，见图9。粉料撒布车及冷再生拌和机工作原理、特点及适用范围粉料撒布车工作原理粉料撒布车主要由粉料箱、主控计量系统、撒布系统等3大部分组成，见图10。它拥有独特的称重计量系统，智能化程度高，撒布精确。此车也可作为收料计重系统，在上料时可显示即时料位，料满自动报警。水泥土施工时，操作人员只需要通过驾驶仓中的液晶显示屏输入撒布的材料重量与宽度，系统会自动计算相关参数进行撒布工作。粉料撒布车特点(1)动力方面。撒布车配有自动和手动双动力操控平台，在施工过程中更加节能。

　　(7) Experimental testing. After the cement stabilized soil compaction is completed, self inspection should be carried out first, as shown in Figure 8. After passing the self inspection, report to the Director's Office and the central laboratory for testing. Only after passing the inspection can the next step of construction be carried out. (8) Health preservation. After each section of cement stabilized soil is compacted and passes the compaction degree inspection, it should be cured immediately and the curing period should not be less than 7 days. The surface of the stabilized soil layer should be kept moist throughout the curing period, as shown in Figure 9. The working principle, characteristics, and scope of application of the powder spreading vehicle and cold recycling mixer. The working principle of the powder spreading vehicle is mainly composed of three parts: the powder box, the main control metering system, and the spreading system, as shown in Figure 10. It has a unique weighing and measuring system, high level of intelligence, and precise spreading. This vehicle can also be used as a material weighing system, which can display the real-time material level during loading and automatically sound an alarm when the material is full. During cement soil construction, operators only need to input the weight and width of the material to be spread through the LCD screen in the driver's cab, and the system will automatically calculate the relevant parameters for spreading work. Characteristics of powder spreading vehicle (1) in terms of power. The spreader is equipped with an automatic and manual dual power control platform, which is more energy-efficient during the construction process.

　　(2)智能化方面。出料口配有均整器，使粉料的撒布更均匀平整。施工过程中可全自动化操作，施工参数均可随时显示，且可记录保存。

　　(2) In terms of intelligence. The discharge port is equipped with a homogenizer to ensure a more uniform and smooth distribution of powder. The construction process can be fully automated, and the construction parameters can be displayed at any time and recorded and saved.

　　(3)环境保护方面。车辆配有脉冲式除尘系统，有效地控制了扬尘，可降低整个施工过程的空气污染。粉料撒布车适用范围粉料撒布车适用于撒布水泥、石灰粉、粉煤灰等粉状物料。冷再生拌和机工作原理冷再生拌和机工作原理是配备一个装有若干个硬质合金刀具的切削转子，转子旋转时，向上切削泥土，在拌和罩内被切削下的泥土与撒布的缓凝水泥进行充分均匀地混合，见图11。当工作深度一旦确定时，转子的切削深度将由传感器感应并传达至控制系统，从而保证拌和深度，达到最佳拌和要求。在冷再生拌和机工作时，其行进速度为5~8m/min，同时配有专人跟机每隔15~20m检查拌和深度，并配合再生机操作人员及时调整拌和深度，严禁出现拌和不到位的夹层现象。冷再生拌和机特点(1)拌和高效性。WR250冷再生拌和机最大功率可达571kW，切削性能可达24kW/cm，在水泥土施工中，理想工作量可达4000~6000m2/d(按日工作时长8h计)，单位时间内拌和水泥土方量是普通拌和机的1.7倍。

　　(3) In terms of environmental protection. The vehicle is equipped with a pulse type dust removal system, which effectively controls dust and reduces air pollution throughout the construction process. The scope of application of the powder spreading vehicle is that it is suitable for spreading powdered materials such as cement, lime powder, and fly ash. The working principle of a cold recycling mixer is to equip it with a cutting rotor equipped with several hard alloy cutting tools. When the rotor rotates, it cuts the soil upwards, and the soil cut in the mixing hood is thoroughly and evenly mixed with the dispersed retarding cement, as shown in Figure 11. Once the working depth is determined, the cutting depth of the rotor will be sensed by sensors and transmitted to the control system to ensure the mixing depth and achieve the optimal mixing requirements. When the cold recycling mixer is working, its traveling speed is 5-8m/min, and a dedicated person is assigned to follow the machine to check the mixing depth every 15-20 meters, and cooperate with the regeneration machine operator to adjust the mixing depth in a timely manner. It is strictly prohibited to have interlayer phenomena where the mixing is not in place. Characteristics of Cold Recycling Mixer (1) Mixing Efficiency. The maximum power of WR250 cold recycling mixer can reach 571kW, and the cutting performance can reach 24kW/cm. In cement soil construction, the ideal workload can reach 4000-6000m2/d (calculated based on a daily working time of 8h), and the amount of cement soil mixed per unit time is 1.7 times that of ordinary mixer.

　　(2)拌和均匀性。冷再生拌和机采用强有力的拌和转子且转子升降可自动调节，能够将现有土壤与预撒布的水泥拌和，形成均匀的混合料。同时可调节拌和仓随工作深度而变化，因此保证了即使在最大深度下，也能达到最高产量和良好的拌和效果。

　　(2) Uniformity of mixing. The cold recycling mixer adopts a powerful mixing rotor and the rotor lifting can be automatically adjusted, which can mix the existing soil with pre spread cement to form a uniform mixture. At the same time, the adjustable mixing chamber varies with the working depth, ensuring that even at the maximum depth, the highest output and good mixing effect can be achieved.

　　(3)杰出的越野机动性。轮胎体积超大、胎纹深，能够将发动机的高功率有效地传输给土壤，轻松适应崎岖不平、狭窄空间调头、恶劣土壤等施工条件，同时将施工产量提升到一个新高度。

　　(3) Outstanding off-road maneuverability. The tire has a large volume and deep tread, which can effectively transmit the high power of the engine to the soil, making it easy to adapt to construction conditions such as roughness, narrow space turning, and harsh soil, while also increasing construction output to a new height.

　　(4)拌和环保性。与普通拌和机相比，冷再生拌和机拌和罩封闭更严密，更贴近于地面，这就有效避免了拌和过程扬尘的产生。冷再生拌和机适用范围其主要用于沥青混凝土路面的铣刨以及添加沥青、水等材料后的旧沥青路面回收料的再生；也用于高速公路、城乡道路、机场、码头、停车场等工程的基层、底层稳定土现场就地拌和作业。应用效果比对以水泥搅拌桩段落褥垫层厚度30cm、长度100m、宽度45m施工现场为例，对人工撒布水泥加传统拌和机拌和方式与粉料撒布车加冷再生拌和机配套使用方式进行比较。人工撒布水泥与粉料撒布车撒布水泥的各项比较(1)撒布方法比较。人工撒布需满布满撒全幅撒布；机械撒布为电脑智能控制，且撒布宽度可在0.5m~4m范围内任意调节。

　　(4) Mixing environmental friendliness. Compared with ordinary mixers, the mixing hood of the cold recycling mixer is more tightly sealed and closer to the ground, which effectively avoids the generation of dust during the mixing process. The application scope of the cold recycling mixer is mainly used for milling and planing asphalt concrete pavement, as well as the recycling of old asphalt pavement materials after adding asphalt, water and other materials; It is also used for on-site mixing of stabilized soil at the grassroots and bottom layers of highways, urban and rural roads, airports, docks, parking lots, and other projects. Comparison of application effects: Taking the construction site of a cement mixing pile section with a cushion layer thickness of 30cm, length of 100m, and width of 45m as an example, a comparison is made between the manual spreading of cement and the traditional mixing method with a powder spreading truck and a cold recycling mixing machine. Comparison of various methods between manually spreading cement and powder spreading truck spreading cement (1) Comparison of spreading methods. Manual spreading requires full coverage and full width spreading; Mechanical spreading is controlled by computer intelligence, and the spreading width can be adjusted freely within the range of 0.5m~4m.

　　(2)撒布均匀程度比较。人工撒布为人工铁锹撒布，撒布不均匀的情况时有发生；机械撒布为电脑精确控制，其撒布量不会因为车速快慢而改变，撒布车输料螺旋与拨料辊均可控制转速，输料与计量准确性高，且拨料辊在撒布水泥落地前再进行“散打”，可保证撒布效果更均匀。

　　(2) The uniformity of spreading is relatively high. Manual distribution refers to manual shovel distribution, and uneven distribution occurs occasionally; Mechanical spreading is precisely controlled by a computer, and its spreading amount will not change due to the speed of the vehicle. The feeding screw and feeding roller of the spreading vehicle can both control the speed, and the feeding and measuring accuracy is high. In addition, the feeding roller performs a "sanda" before spreading the cement to the ground, ensuring a more uniform spreading effect.

　　(3)撒布材料损耗情况比较。人工撒布时水泥实际控制剂量要较理论掺加量增加1%，而用设备撒布时掺量增加0.5%即可。

　　(3) Comparison of material loss during spreading. When manually spreading, the actual controlled dosage of cement should be increased by 1% compared to the theoretical dosage, while when using equipment for spreading, the dosage can be increased by 0.5%.

　　(4)撒布时间比较。人工撒布水泥需人工提前打方格网且水泥需要人工装卸、摆放、拆包及撒布，费时费力；机械撒布为机械化作业，整个工作过程可由驾驶司机一人操作，机械化程度高，省时省力。

　　(4) The spreading time is relatively long. Manual spreading of cement requires pre grid laying and manual loading, unloading, placement, unpacking, and spreading, which is time-consuming and labor-intensive; Mechanical spreading is a mechanized operation, and the entire process can be operated by the driver alone, with a high degree of mechanization and saving time and effort.

　　(5)环境保护比较。人工撒布受天气及人力影响大，易出现扬尘，污染环境；机械撒布配备有抑尘罩，且配有脉冲式除尘系统，在撒布过程中可避免扬尘，环境污染小。传统拌和机与冷再生拌和机拌和的各项比较(1)拌和宽度比较。普通拌和机拌和宽度为2m；冷再生拌和机拌和宽度为2.4m。

　　(5) Comparison of environmental protection. Artificial spreading is greatly affected by weather and manpower, and is prone to dust and environmental pollution; Mechanical spreading is equipped with a dust suppression hood and a pulse type dust removal system, which can avoid dust during the spreading process and minimize environmental pollution. Comparison of mixing width between traditional mixer and cold recycling mixer (1). The mixing width of a regular mixer is 2m; the mixing width of a cold recycling mixer is 2.4m.

　　(2)行进速度比较。普通拌和机有效行进速度为6.7m/min；冷再生拌和机有效行进速度为8m/min。

　　(2) Comparison of travel speed. The effective travel speed of a regular mixer is 6.7m/min; The effective travel speed of the cold recycling mixer is 8m/min.

　　(3)拌和深度比较。普通拌和机最大拌和深度为25cm；冷再生拌和机最大拌和深度可达56cm。

　　(3) Comparison of mixing depth. The maximum mixing depth of a regular mixer is 25cm; the maximum mixing depth of a cold recycling mixer can reach 56cm.

　　(4)拌和均匀性比较。普通拌和机拌和不均匀，存在漏拌土块现象；冷再生拌和机的特制转子使得拌和更均匀，水泥土碾压后黏合更密实。施工质量比较传统人工及机械配套使用时水泥撒布均匀性、拌和机拌和均匀性均难以控制，影响施工质量。而粉料撒布车与冷再生拌和机配套使用时水泥撒布更均匀，撒布效果更好，拌和机拌和均匀且彻底，大大提升了施工质量，见图12。施工成本比较(1)施工一层(长100m)配套机械费用(含油)。

　　(4) Comparison of mixing uniformity. Ordinary mixer mixing is uneven and there is a phenomenon of missing soil blocks; The specially designed rotor of the cold recycling mixer makes the mixing more uniform, and the cement and soil bond more tightly after compaction. Compared to traditional manual and mechanical methods, the uniformity of cement spreading and mixing with a mixer is difficult to control, which affects the construction quality. When the powder spreading vehicle is used in conjunction with the cold recycling mixer, the cement spreading is more uniform, the spreading effect is better, and the mixer mixes evenly and thoroughly, greatly improving the construction quality, as shown in Figure 12. Comparison of construction costs: (1) Cost of supporting machinery (including oil) for constructing a first floor (100m long).

　　22t压路机工作时间为4h(220元/h)，山推16t推土机工作时间为8h(240元/h)，临工180平地机工作时间为4h(240元/h)。普通拌和机为400元/h，冷再生拌和机为800元/h，粉料撒布车为450元/h，人工价格为180元/人。

　　The working time of a 22t road roller is 4 hours (220 yuan/h), a 16t bulldozer for mountain pushing is 8 hours (240 yuan/h), and a temporary 180 level grader is 4 hours (240 yuan/h). A regular mixer costs 400 yuan/h, a cold recycling mixer costs 800 yuan/h, a powder spreader costs 450 yuan/h, and the labor price is 180 yuan/person.

　　(2)人工撒布拌和机拌和。撒布一层水泥需要人工12人，普通拌和机拌和1层需要3h，分2层施工，施工费用为：

　　(2) Manual spreading mixer for mixing. Spreading a layer of cement requires 12 manual workers, and mixing one layer with a regular mixer takes 3 hours. The construction is divided into two layers, and the construction cost is:

　　180元/人x12人+400元/hx3h+220元/hx4h+240元/hx8h+240元/hx4h)x2层=14240元

　　180 yuan/person x 12 people+400 yuan/hx3h+220 yuan/hx4h+240 yuan/hx8h+240 yuan/hx4h) x2 floors=14240 yuan

　　(3)粉料撒布车与冷再生拌和机配套使用。撒布水泥1层需要3h，拌和1层需要4h，分1层施工，施工费用为：

　　(3) The powder spreading vehicle is used in conjunction with the cold recycling mixer. Spreading one layer of cement takes 3 hours, mixing one layer takes 4 hours, and construction is divided into one layer. The construction cost is:

　　450元/hx3h+800元/hx4h+220元/hx4h+240元/hx8h+240元/hx4h=8310元

　　450 yuan/hx3h+800 yuan/hx4h+220 yuan/hx4h+240 yuan/hx8h+240 yuan/hx4h=8310 yuan

　　(4)每完成100m，节省：14240元-8310元=5930元。

　　(4) For every 100m completed, the savings are 14240-8310 yuan=5930 yuan.

　　(5)全线水泥稳定土长度为7137m，共节约成本7137m÷100mx5930元=423224元。社会效益(1)可有效避免施工扬尘产生，满足新形势下的环保要求且改善了筑路工人劳动条件。

　　(5) The length of cement stabilized soil along the entire line is 7137m, saving a total cost of 7137m ÷ 100mx5930 yuan=423224 yuan. Social benefits (1) can effectively avoid the generation of construction dust, meet the environmental protection requirements under the new situation, and improve the working conditions of road construction workers.

　　(2)降低了原材料消耗，减少了人工费用，实现了施工机械化，缩短了建设工期。结语实际研究表明，将冷再生拌和机应用到水泥稳定土施工中，既节省了成本，又对以后同类项目施工打下了良好的基础，在取得良好的社会效益、经济效益的同时，对生态环境保护、资源节约等都有良好的示范作用，是一项切实可行、有广阔发展前景的施工方式。

　　(2) Reduced raw material consumption, reduced labor costs, achieved construction mechanization, and shortened the construction period. Conclusion: Practical research has shown that applying cold recycling mixers to cement stabilized soil construction not only saves costs, but also lays a good foundation for future similar project construction. While achieving good social and economic benefits, it also has a good demonstration effect on ecological environment protection, resource conservation, etc. It is a practical and feasible construction method with broad development prospects.