交叉口作為道路網(wǎng)絡(luò)的關(guān)鍵節(jié)點(diǎn)，其路面質(zhì)量直接影響交通流暢度與行車安全。冷再生技術(shù)作為綠色出色的養(yǎng)護(hù)工藝，在交叉口維修中廣泛應(yīng)用，而接縫處理是決定冷再生層整體性的核心環(huán)節(jié)。水泥灑布車作為冷再生施工的關(guān)鍵設(shè)備，其操作精度與工藝控制直接關(guān)系到接縫質(zhì)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.

　　施工前需進(jìn)行精細(xì)化準(zhǔn)備。首先對(duì)交叉口原路面進(jìn)行多維度評(píng)估，利用落錘式彎沉儀檢測(cè)承載能力，確定冷再生深度通常為15-20厘米。采用銑刨機(jī)對(duì)舊瀝青層進(jìn)行預(yù)處理，控制銑刨速度在6-8米/分鐘，確保再生料級(jí)配符合設(shè)計(jì)要求。水泥灑布車需提前進(jìn)行計(jì)量系統(tǒng)校準(zhǔn)，通過(guò)靜態(tài)標(biāo)定與動(dòng)態(tài)撒布試驗(yàn)，將撒布量誤差控制在±0.5千克/平方米以內(nèi)，非常對(duì)接縫區(qū)域設(shè)置0.5-1.0米的重疊撒布帶，防止出現(xiàn)素土夾層。

　　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.

　　接縫處理工藝需分階段控制。在橫向接縫處，采用端部切割法形成垂直斷面，使用高壓空氣壓縮機(jī)清除松散顆粒，露出新鮮骨料。水泥灑布車在此區(qū)域采用雙層撒布工藝，首層按設(shè)計(jì)量撒布，第二層增加10%-15%的撒布量，形成梯度結(jié)合面?？v向接縫則采用搭接法，搭接寬度控制在20-30厘米，通過(guò)車載GPS定位系統(tǒng)確保重疊精度，避免出現(xiàn)漏撒或過(guò)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.

　　施工過(guò)程中需核心關(guān)注環(huán)境因素。當(dāng)氣溫低于10℃或高于35℃時(shí)，需在水泥中添加早強(qiáng)劑或緩凝劑，調(diào)整初凝時(shí)間至4-6小時(shí)。雨季施工時(shí)，在接縫處增設(shè)防水土工布，防止雨水滲透影響水泥水化反應(yīng)。對(duì)于重載交通交叉口，在接縫位置下方鋪設(shè)玻璃纖維格柵，層間粘結(jié)強(qiáng)度可提升30%以上，有效延緩反射裂縫產(chǎn)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.

　　質(zhì)量控制貫穿施工全周期。采用核子密度儀對(duì)接縫處進(jìn)行實(shí)時(shí)檢測(cè)，壓實(shí)度需達(dá)到設(shè)計(jì)值的98%以上。利用激光平整度儀進(jìn)行橫向斷面掃描，接縫處高差控制在3毫米以內(nèi)。養(yǎng)護(hù)期間，在接縫位置覆蓋無(wú)紡布，每日灑水3-4次，保持表面濕潤(rùn)狀態(tài)持續(xù)7天，促進(jìn)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.

　　特殊工況需采取專項(xiàng)措施。對(duì)于曲線半徑小于50米的交叉口，采用分段撒布法，每段長(zhǎng)度控制在8-10米，通過(guò)車載角度傳感器自動(dòng)調(diào)整噴嘴方向，確保水泥分布均勻。在橋梁引道與路面接縫處，設(shè)置30厘米寬的聚酯纖維增強(qiáng)帶，抗拉強(qiáng)度可達(dá)800牛/5厘米，有效應(yīng)對(duì)不均勻沉降。

　　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.

　　后期評(píng)估顯示，采用精細(xì)化接縫處理技術(shù)的交叉口冷再生層，其使用壽命較傳統(tǒng)工藝延長(zhǎng)40%-50%，接縫處車轍深度降低60%以上。建議建立數(shù)字化施工檔案，通過(guò)車載終端記錄撒布量、施工位置、環(huán)境參數(shù)等數(shù)據(jù)，為后期養(yǎng)護(hù)提供決策支持。隨著智能施工裝備發(fā)展，配備3D攤鋪系統(tǒng)的水泥灑布車可實(shí)現(xiàn)接縫位置的毫米級(jí)控制，推動(dòng)冷再生技術(shù)向更高精度方向發(fā)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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