交叉口作为道路网络的关键节点，其路面质量直接影响交通流畅度与行车。冷再生技术作为绿色的养护工艺，在交叉口维修中广泛应用，而接缝处理是决定冷再生层整体性的核心环节。水泥洒布车作为冷再生施工的关键设备，其操作精度与工艺控制直接关系到接缝质量。

　　As a key node in the road network, the road surface quality of intersections directly affects traffic flow and driving safety. Cold recycling technology, as a green and efficient maintenance process, is widely used in intersection maintenance, and joint treatment is the core link that determines the integrity of the cold recycling layer. As a key equipment for cold recycling construction, the operation accuracy and process control of cement distribution trucks are directly related to the quality of joints.

　　施工前需进行精细化准备。对交叉口原路面进行评估，利用落锤式弯沉仪检测承载能力，确定冷再生深度通常为15-20厘米。采用铣刨机对旧沥青层进行预处理，控制铣刨速度在6-8米/分钟，确保再生料级配符合设计要求。水泥洒布车需提前进行计量系统校准，通过静态标定与动态撒布试验，将撒布量误差控制在±0.5千克/以内，特别对接缝区域设置0.5-1.0米的重叠撒布带，防止出现素土夹层。

　　Fine preparation is required before construction. Firstly, a comprehensive evaluation of the original road surface at the intersection is conducted, using a drop hammer deflectometer to detect the bearing capacity and determine that the cold regeneration depth is usually 15-20 centimeters. Pre treat the old asphalt layer using a milling machine, controlling the milling speed at 6-8 meters per minute to ensure that the gradation of recycled materials meets the design requirements. The cement spraying truck needs to undergo calibration of the measuring system in advance. Through static calibration and dynamic spraying tests, the spraying amount error should be controlled within ± 0.5 kg/square meter. In particular, overlapping spraying belts of 0.5-1.0 meters should be set up in the joint area to prevent the occurrence of soil interlayers.

　　接缝处理工艺需分阶段控制。在横向接缝处，采用端部切割法形成垂直断面，使用高压空气压缩机松散颗粒，露出新鲜骨料。水泥洒布车在此区域采用双层撒布工艺，首层按设计量撒布，第二层增加10%-15%的撒布量，形成梯度结合面。纵向接缝则采用搭接法，搭接宽度控制在20-30厘米，通过车载GPS定位系统确保重叠精度，避免出现漏撒或过量。

　　The seam treatment process needs to be controlled in stages. At the transverse joint, the end cutting method is used to form a vertical section, and a high-pressure air compressor is used to remove loose particles and expose fresh aggregates. The cement spreader adopts a double-layer spreading process in this area. The first layer spreads according to the design amount, and the second layer increases the spreading amount by 10% -15% to form a gradient bonding surface. The longitudinal seam adopts the overlapping method, with the overlapping width controlled at 20-30 centimeters. The overlapping accuracy is ensured through the vehicle GPS positioning system to avoid leakage or excess.

　　施工过程中需关注环境因素。当气温低于10℃或高于35℃时，需在水泥中添加早强剂或缓凝剂，调整初凝时间4-6小时。雨季施工时，在接缝处增设防水土工布，防止雨水渗透影响水泥水化反应。对于重载交通交叉口，在接缝位置下方铺设玻璃纤维格栅，层间粘结强度可提升30%以上，有效延缓反射裂缝产生。

　　During the construction process, special attention should be paid to environmental factors. When the temperature is below 10 ℃ or above 35 ℃, early strength agent or retarder should be added to the cement, and the initial setting time should be adjusted to 4-6 hours. During rainy season construction, waterproof geotextile should be added at the joints to prevent rainwater infiltration from affecting the cement hydration reaction. For heavy-duty traffic intersections, laying fiberglass grids below the joint position can increase interlayer bonding strength by more than 30%, effectively delaying the occurrence of reflective cracks.

　　质量控制贯穿施工全周期。采用核子密度仪对接缝处进行实时检测，压实度需达到设计值的98%以上。利用激光平整度仪进行横向断面扫描，接缝处高差控制在3毫米以内。养护期间，在接缝位置覆盖无纺布，每日洒水3-4次，保持表面湿润状态持续7天，促进水泥充分水化。

　　Quality control runs through the entire construction cycle. Real time detection of the joint using a nuclear density meter, with a compaction degree of over 98% of the design value. Use a laser flatness meter to scan the transverse section, and control the height difference at the joint within 3 millimeters. During the maintenance period, cover the joint position with non-woven fabric and sprinkle water 3-4 times a day to keep the surface moist for 7 days, promoting sufficient hydration of cement.

　　特殊工况需采取专项措施。对于曲线半径小于50米的交叉口，采用分段撒布法，每段长度控制在8-10米，通过车载角度传感器自动调整喷嘴方向，确保水泥分布均匀。在桥梁引道与路面接缝处，设置30厘米宽的聚酯纤维增强带，抗拉强度可达800牛/5厘米，有效应对不均匀沉降。

　　Special measures need to be taken for special working conditions. For intersections with a curve radius less than 50 meters, the segmented spreading method is used, with each segment length controlled between 8-10 meters. The nozzle direction is automatically adjusted by a vehicle mounted angle sensor to ensure even distribution of cement. At the joint between the bridge approach and the road surface, a 30 centimeter wide polyester fiber reinforced tape is installed, with a tensile strength of up to 800 N/5 cm, effectively dealing with uneven settlement.

　　后期评估显示，采用精细化接缝处理技术的交叉口冷再生层，其使用寿命较传统工艺延长40%-50%，接缝处车辙深度降低60%以上。建议建立数字化施工档案，通过车载终端记录撒布量、施工位置、环境参数等数据，为后期养护提供决策支持。随着智能施工装备发展，配备3D摊铺系统的水泥洒布车可实现接缝位置的毫米级控制，推动冷再生技术向更高精度方向发展。

　　Post evaluation shows that the use of refined joint treatment technology in the cold regeneration layer of intersections extends its service life by 40% -50% compared to traditional processes, and reduces the rut depth at the joint by more than 60%. It is recommended to establish a digital construction archive, which records data such as spreading amount, construction location, and environmental parameters through vehicle mounted terminals, to provide decision support for later maintenance. With the development of intelligent construction equipment, cement sprinklers equipped with 3D paving systems can achieve millimeter level control of joint positions, promoting the development of cold recycling technology towards higher precision.

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