1.1 工艺工法概况水泥稳定碎石基层是具有一定强度和刚度的路面结构层，是公路路面结构重要的组成部分，既保证铺设路面有一定厚度，满足承载负荷，又能减少建设成本。它可将路面承受的车辆荷载均衡的扩散到路基，具有一定的韧性。水泥稳定碎石基层施工分为平地机铺筑和摊铺机铺筑，为了保证路面结构层的质量，高等级公路采用摊铺机铺筑。

　　1.1 Overview of Technological Methods: Cement stabilized crushed stone base is a pavement structure layer with certain strength and stiffness, and is an important component of highway pavement structure. It not only ensures that the pavement has a certain thickness to meet the bearing load, but also reduces construction costs. It can evenly distribute the vehicle load borne by the road surface to the roadbed, and has a certain degree of toughness. The construction of cement stabilized crushed stone base is divided into flat machine paving and paver paving. In order to ensure the quality of the pavement structure layer, high-grade highways use paver paving.

　　1.2 工艺原理水泥稳定碎石是以级配碎石为骨料，采用一定数量的水泥作为胶结材料，通过拌和、摊铺、碾压，利用碎石间的嵌挤锁结形成具有一定强度的结构层。

　　1.2 Process principle: Cement stabilized crushed stone is composed of graded crushed stone as aggregate and a certain amount of cement as bonding material. Through mixing, paving, and rolling, a structural layer with certain strength is formed by interlocking the crushed stones.

　　2 工艺工法特点2.1作为路基与路面的过渡层，既能保证路面结构的厚度，又具有很好的刚度和强度。2.2 铺筑水泥稳定碎石基层能很好的控制基层集料的均与性，避免了平地机铺筑有可能造成的粗集料局部堆积，保证了基层的施工质量。

　　2.1 As a transition layer between the roadbed and the pavement, it can ensure the thickness of the pavement structure while also having good rigidity and strength. 2.2 The laying of cement stabilized crushed stone base can effectively control the uniformity of the base aggregate, avoiding the possible local accumulation of coarse aggregate caused by the use of leveling machines, and ensuring the construction quality of the base.

　　2.3 铺筑水泥稳定碎石基层能够充分保证基层的平整度和施工速度。3 适用范围适用于高等级公路路面水泥稳定碎石基层摊铺机摊铺法施工。

　　2.3 Laying cement stabilized crushed stone base can fully ensure the flatness and construction speed of the base. The scope of application is applicable to the construction of cement stabilized crushed stone base paving machine for high-grade highway pavement.

　　4 主要引用标准《公路路面基层施工技术规范》JTJ 034；《公路工程质量检验评定标准》JTG F80；《公路土工试验规程》JTJ 051；《公路工程无机结合料稳定材料试验规程》JTJ 057；《公路路基路面现场测试规程》JTJ 059。5施工方法水泥稳定碎石基层是将水泥、碎石、水按照配合比试验确定的比例经拌和，摊铺、组合压路机碾压达到设计压实度，经养护后构成的路面基层。应通过修筑试验路段，取得各种施工参数制定标准施工方法后，进行大面积推广施工。

　　4. Main reference standards: "Technical Specification for Construction of Highway Pavement Base" JTJ 034; Quality Inspection and Evaluation Standards for Highway Engineering JTG F80; Code for Soil Testing of Highways JTJ 051; Test code for inorganic binder stabilized materials in highway engineering JTJ 057; Code for On site Testing of Highway Roadbeds and Pavements JTJ 059. The construction method of cement stabilized crushed stone base is to mix cement, crushed stone, and water according to the proportion determined by the mix proportion test, spread them, and combine them with a roller to achieve the design compaction degree. After curing, it forms the pavement base. After obtaining various construction parameters and establishing standard construction methods through the construction of test sections, large-scale promotion of construction should be carried out.

　　施工准备（1）混合料拌和站的设置需要根据工程规模及地理位置综合考虑场址、水、电、道路、材料供应、环境保护等各项要求选择布置。建设完经过标定后方可投入使用。（2）在水泥稳定碎石层施工前应做好下承层验收工作。下承层表面应平整、坚实、具有规定的路拱，没有任何松散的材料和软弱点。对于底基层，根据压实度检查（或碾压检验）和弯沉测定结果，凡不符合设计要求的路段，必须根据具体情况，分别采用补充碾压、加厚底基层、换填好的材料、挖开晾晒等措施，使达到标准。同时验收时应逐一断面检查下承层标高是否符合设计要求，下承层标高的误差应符合规范要求。新完成的底基层或土基，必须按规范规定项目及标准进行验收。

　　Construction preparation (1) The setting of the mixed material mixing station needs to be selected and arranged based on the project scale and geographical location, taking into account various requirements such as site, water, electricity, roads, material supply, and environmental protection. After construction and calibration, it can be put into use. (2) Before the construction of cement stabilized crushed stone layer, the acceptance work of the underlying layer should be done well. The surface of the lower layer should be flat, solid, and have the prescribed road arch, without any loose materials or soft spots. For the subgrade layer, according to the compaction degree inspection (or rolling test) and deflection measurement results, for any road section that does not meet the design requirements, measures such as supplementary rolling, thickening of the subgrade layer, replacement of filled materials, excavation and drying must be taken according to the specific situation to meet the standards. At the same time, during the acceptance inspection, each section should be checked to see if the elevation of the lower bearing layer meets the design requirements, and the error of the lower bearing layer elevation should comply with the specifications. The newly completed subgrade or soil foundation must be inspected and accepted according to the specified projects and standards.

　　（3）现场技术人员必须对拌合站、压路机、摊铺机、运输车辆、水车的操作人员进行培训、技术安全交底，做到熟练掌握混合料的拌和、运输、摊铺、碾压、协调等各个环节的技术要求。

　　(3) On site technicians must provide training and technical safety briefing to operators of mixing stations, rollers, pavers, transport vehicles, and water trucks, in order to proficiently master the technical requirements for mixing, transportation, paving, rolling, coordination, and other aspects of the mixture.

　　（4）在下承层上准确恢复中线。直线段每15—20m设一桩，曲线段每10—15m设一桩，测钎在两侧路面边缘外30—50cm处采用钢钎设置挂上钢线(摊铺基准线)，测钎位置正确，支座牢固，测量准确、采用悬线法根据摊铺厚度及松铺系数每10m测量出钢线标高，钢钎应牢固顺直以利于传感器正常行走，钢丝线的张力必须达800～1000N。6.2.2路肩培土按要求培肩，路肩压实厚度应与摊铺层压实厚度相同，每隔30m左右两侧交错开挖宽度为20-30cm的临时泄水沟，确保路基排水通畅。

　　(4) Accurately restore the centerline on the underlying layer. A pile is set every 15-20 meters for straight sections and every 10-15 meters for curved sections. Steel stakes are used to hang steel wires (paving reference lines) 30-50cm outside the edges of the road surface on both sides. The position of the stakes is correct, the support is firm, and the measurement is accurate. The suspended line method is used to measure the elevation of the steel wires every 10 meters based on the paving thickness and loose paving coefficient. The steel stakes should be firm and straight to facilitate the normal movement of sensors, and the tension of the steel wires must reach 800-1000N. 6.2.2 Shoulder soil should be leveled according to requirements, and the compacted thickness of the shoulder should be the same as the compacted thickness of the paving layer. Temporary drainage ditches with a width of 20-30cm should be excavated alternately on both sides every 30 meters to ensure smooth drainage of the roadbed.

　　（1）培路肩(包括中央分隔带)：采用含水量适宜的粘土培肩；挂出路肩边缘高度线，挂线高度应为基层厚度乘以土方松方系数，一般较设计的路肩(内侧)宽度宽出20—30cm，人工摊铺整平，培肩后用推土机稳压两遍，用振动式压路机压实，平地机刮平表面。培肩时应挂出培肩的外缘线和内侧边缘线，并用水准仪准确放出路肩松方厚度。

　　(1) Shoulder training (including median strip): Use clay shoulder training with suitable moisture content; Hang the height line of the shoulder edge, which should be the thickness of the base layer multiplied by the soil loosening coefficient. Generally, it should be 20-30 cm wider than the designed shoulder (inner side) width. It should be manually spread and leveled, and after shoulder training, a bulldozer should be used to stabilize the pressure twice. A vibratory roller should be used for compaction, and a grader should be used to scrape the surface flat. When performing shoulder training, the outer and inner edge lines of the shoulder should be hung, and the loose thickness of the shoulder should be accurately measured with a level.

　　（2）培肩质量要求：外边缘和内边缘顺直且相互平行，表面平整，顺适，纵向不能有起伏凹凸处，宽度、厚度满足要求。

　　(2) Quality requirements for shoulder training: The outer and inner edges should be straight and parallel to each other, the surface should be flat and smooth, there should be no undulations or bumps in the longitudinal direction, and the width and thickness should meet the requirements.

　　（3）切槽：切槽前，先由履带式拖拉机或装载机初步稳压，再由振动式压路机碾压密实，然后用平路机刮平表面，测量人员根据中线重新恢复路肩的边缘线，挂线后人工切槽，切口竖直、切面平整顺直、无波浪，不得有缺棱掉角的现象。切槽土保证清理干净，没有浮土，并将所有切除土运走。

　　(3) Cutting groove: Before cutting groove, the crawler tractor or loader is first used to stabilize the pressure, and then the vibratory roller is used to compact it. Then, the surface is scraped flat with a leveling machine, and the measuring personnel restore the edge line of the shoulder according to the centerline. After hanging the line, the groove is manually cut, and the cut is vertical, the cut surface is flat and straight, without waves, and there should be no missing edges or corners. Ensure that the cut soil is clean and free of floating soil, and transport all the cut soil away.

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