橋梁與道路銜接段作為交通基礎設施的關鍵節(jié)點，其平整度與結構穩(wěn)定性直接影響行車與使用壽命。冷再生機租賃服務為該區(qū)域的特殊處理提供了經濟的解決方案，通過材料再生與工藝優(yōu)化實現新舊結構的有效融合。本文將系統(tǒng)闡述冷再生機在橋梁銜接段施工中的核心技術要點。

　　As a key node of transportation infrastructure, the smoothness and structural stability of the bridge and road connection section directly affect driving safety and service life. The leasing service of cold recycling machines provides an economical and efficient solution for the special treatment of this area, achieving effective integration of old and new structures through material regeneration and process optimization. This article will systematically explain the core technical points of cold recycling machines in the construction of bridge connection sections.

　　一、工程難點與技術需求

　　1、 Engineering difficulties and technical requirements

　　橋梁銜接段存在三大核心難題：

　　There are three core challenges in the bridge connection section:

　　剛柔過渡問題：橋梁結構剛性與路基柔性形成模量差異，易導致差異沉降。

　　Transition problem between rigidity and flexibility: The difference in modulus between the rigidity of bridge structures and the flexibility of roadbeds can easily lead to differential settlement.

　　材料兼容性：橋頭混凝土結構與路基瀝青/水泥材料需實現力學性能匹配。

　　Material compatibility: The mechanical properties of the concrete structure at the bridgehead and the asphalt/cement materials used in the roadbed need to be matched.

　　施工空間限制：狹窄作業(yè)面要求設備具備高精度操控能力。

　　Construction space limitations: Narrow working surfaces require equipment with high-precision control capabilities.

　　冷再生機通過就地再生技術，可將舊路材料轉化為高性能基層，同時實現精確的縱斷面控制，有效化解上述矛盾。

　　The cold recycling machine can convert old road materials into high-performance substrates through on-site regeneration technology, while achieving precise longitudinal section control, effectively resolving the above contradictions.

　　二、核心處理工藝解析

　　2、 Analysis of core processing technology

　　精準銑刨與材料配比

　　Precise milling and material proportioning

　　采用激光控制銑刨深度，確保銜接段坡度誤差控制在±5mm以內。對橋臺背墻5米范圍內實施梯度銑刨，深度從0逐步過渡20cm，形成柔性緩沖層。再生材料需添加6%-8%水泥穩(wěn)定劑，通過冷再生機內置計量系統(tǒng)實現精準摻配。

　　Laser controlled milling depth is used to ensure that the slope error of the connecting section is controlled within ± 5mm. Implement gradient milling within 5 meters of the back wall of the bridge abutment, gradually transitioning from 0 to 20cm in depth to form a flexible buffer layer. Recycled materials require the addition of 6% -8% cement stabilizer, which can be accurately mixed through the built-in metering system of the cold recycling machine.

　　特殊添加劑應用

　　Application of special additives

　　針對橋頭高填方區(qū)域，在再生料中摻入0.3%-0.5%聚酯纖維，提升抗裂性能。對于潮濕環(huán)境，添加2%-3%生石灰進行改性處理，降低含水率對壓實度的影響。添加劑需通過冷再生機專用噴灑系統(tǒng)均勻混合。

　　For the high fill area at the bridgehead, 0.3% -0.5% polyester fiber is added to the recycled material to improve its crack resistance. For humid environments, add 2% -3% quicklime for modification treatment to reduce the impact of moisture content on compaction degree. Additives need to be evenly mixed through a specialized spray system for cold regeneration machines.

　　過渡段結構設計

　　Transition section structure design

　　在橋臺與路基交界處設置30米漸變段，前10米采用冷再生混合料，中間10米摻入30%級配碎石，后10米過渡常規(guī)路基結構。該設計使模量從150MPa（橋臺）逐步降80MPa（路基），實現應力平穩(wěn)傳遞。

　　Set up a 30 meter transition section at the junction of the bridge pier and the roadbed, using cold recycled mixture for the first 10 meters, adding 30% graded crushed stone for the middle 10 meters, and transitioning to the conventional roadbed structure for the last 10 meters. This design gradually reduces the modulus from 150MPa (bridge abutment) to 80MPa (roadbed), achieving smooth stress transmission.

　　智能壓實控制

　　Intelligent compaction control

　　采用振動壓路機與輪胎壓路機組合工藝，前3遍使用高頻低幅模式（頻率50Hz，振幅0.3mm），后2遍切換為低頻高幅模式（頻率30Hz，振幅0.8mm）。通過壓實度連續(xù)檢測儀實時監(jiān)控，確保96%以上區(qū)域達到馬氏壓實度98%標準。

　　The combination process of vibratory roller and tire roller is adopted. The first three passes use high-frequency low amplitude mode (frequency 50Hz, amplitude 0.3mm), and the last two passes switch to low-frequency high amplitude mode (frequency 30Hz, amplitude 0.8mm). Real time monitoring is carried out through a continuous compaction degree detector to ensure that over 96% of the area meets the standard of 98% Mahalanobis compaction degree.

　　特殊養(yǎng)生措施

　　Special health measures

　　銜接段表面覆蓋聚酯長絲土工布，搭接寬度不小于20cm。采用智能養(yǎng)生系統(tǒng)，通過埋設溫濕度傳感器自動調節(jié)噴淋頻率，保持表面濕潤狀態(tài)不少于7天。對于低溫環(huán)境，增設電熱布進行輔助保溫。

　　The surface of the connecting section is covered with polyester filament geotextile, with a lap width of not less than 20cm. An intelligent health system is adopted, and the spraying frequency is automatically adjusted by embedding temperature and humidity sensors to maintain the surface in a moist state for not less than 7 days. For low-temperature environments, add electric heating cloth for auxiliary insulation.

　　三、施工質量控制要點

　　3、 Key points of construction quality control

　　界面處理：徹底橋臺背墻浮漿，鑿毛深度達2-3mm，露出粗骨料。在混凝土表面涂刷乳化瀝青粘層油，用量控制在0.6-0.8kg/m2。

　　Interface treatment: Thoroughly remove the floating slurry on the back wall of the bridge pier, chisel to a depth of 2-3mm, and expose the coarse aggregate. Apply emulsified asphalt adhesive layer oil on the surface of concrete, with a dosage controlled at 0.6-0.8kg/m2.

　　含水率控制：再生料含水率需保持在含水率±2%范圍內，采用紅外快速檢測儀每50米檢測一次。

　　Moisture content control: The moisture content of the recycled material should be maintained within the optimal moisture content range of ± 2%, and an infrared rapid detector should be used to detect it every 50 meters.

　　平整度驗收：使用8米直尺檢測，間隙不超過3mm，連續(xù)10米范圍內極差控制在5mm以內。

　　Flatness acceptance: Use an 8-meter ruler for testing, with a maximum gap of no more than 3mm, and control the range within 5mm within a continuous 10 meter range.

　　模量檢測：采用便攜式落錘彎沉儀（PFWD）檢測動態(tài)模量，確保不低于120MPa。

　　Modulus testing: A portable drop hammer deflectometer (PFWD) is used to measure the dynamic modulus, ensuring that it is not less than 120MPa.

　　四、環(huán)境與經濟效益

　　4、 Environmental and Economic Benefits

　　材料循環(huán)利用：每千米銜接段可消化舊路材料800-1000噸，減少石料開采量60%以上。

　　Material recycling: 800-1000 tons of old road materials can be digested per kilometer of connecting sections, reducing stone mining by more than 60%.

　　工期優(yōu)化：冷再生工藝較傳統(tǒng)挖除重建縮短工期40%，降低交通管制成本。

　　Construction period optimization: The cold recycling process shortens the construction period by 40% compared to traditional excavation and reconstruction, and reduces traffic control costs.

　　全生命周期成本：通過提升銜接段耐久性，減少后期維修頻次，綜合成本降低25%-35%。

　　Whole life cycle cost: By improving the durability of the connection section and reducing the frequency of later maintenance, the overall cost is reduced by 25% -35%.

　　冷再生機在橋梁銜接段特殊處理中展現出顯著的技術優(yōu)勢，通過材料再生、結構過渡、智能施工等創(chuàng)新工藝，有效解決了傳統(tǒng)施工中的質量通病。隨著設備智能化水平的提升，如5G遠程操控、AI壓實控制等技術的應用，冷再生工藝將向更精準、更的方向發(fā)展，為交通基礎設施建設提供可持續(xù)的解決方案。

　　The cold recycling machine has demonstrated significant technical advantages in the special treatment of bridge connection sections, effectively solving common quality problems in traditional construction through innovative processes such as material recycling, structural transition, and intelligent construction. With the improvement of device intelligence level, such as the application of 5G remote control, AI compaction control and other technologies, the cold recycling process will develop towards a more accurate and efficient direction, providing sustainable solutions for transportation infrastructure construction.

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