Abstract:In response to the problem of large asphalt transport vehicles being unable to reach the paving site directly due to the 3-meter height limit in the Shanghai Beiheng Passage Tunnel Project, the “long-distance transportation outside the site + short-haul transfer at the tunnel entrance” mode is innovatively adopted. By establishing a vertical management system of “short-haul special teams”, the responsibilities of each position are clarified, and 15 dedicated short-haul trucks (with a net height of less than 2.8 m) and 6 full-time staff members are allocated to achieve the full process closed-loop control of mixing station scheduling, tunnel transfer and paving reception. Focusing on the three major difficulties of temperature loss, segregation risk and safety efficiency balance, the comprehensive technical measures are implemented, such as optimizing the discharge temperature of the mixing station SMA-13 up to 180~190 ℃, AC-20C up to 170~180 ℃, strictly limiting the single short haul time to ≤ 30 min and the full vehicle speed to ≤ 20 km/h, adopting the insulation tarpaulin to cover the hopper, isolating the low-temperature ground operations, and constructing a segmented fixed-point temperature measurement + data ledger linkage scheme to strengthen the dynamic monitoring of material temperature, and conducting the rapid grading sampling before paving to improve segregation control. The implementation effect shows that the temperature control in the short haul section is significant. The temperature drop in the short haul section of SMA-13 and AC-20C mixtures is only 8 ℃ and 7 ℃ respectively, while the paving temperature reaches 168 ℃ and 160 ℃. The average compaction degree of the pavement is 97.5% for SMA-13, 97.2% for AC-20C, 1.2 mm for smoothness σ value, and 65 mL/min for permeability coefficient. All indicators are better than the standards, and there are no safety accidents throughout the entire construction process, which provides a reusable practical paradigm for efficient short-haul transportation of asphalt mixtures in urban confined spaces.