High-precision jacking + high-performance asphalt

Boosting Shanghai's northeast

Adding another "north-south traffic artery"

Tunnel Engineering Co., Ltd. participates in construction

Main-line elevated section of Jungong Road Expressway opens to traffic

Section 2 of the newly built Jungong Road Expressway project, constructed by Tunnel Engineering Co., Ltd. Municipal Group, is one of the most difficult and complex sections of the entire line. In the Minxing Road to Xiangyin Road section, a total of 10 spans of superstructure need to be jacked using the existing superstructure of the Middle Ring Road Minxing Road ramp, with a maximum jacking height of 7.654 meters, setting a record for the highest bridge jacking height in Shanghai. After jacking is completed, the structure must match the posture of the existing bridge, requiring extremely high jacking precision.

During construction, Tunnel Engineering Co., Ltd. Municipal Group adopted hydraulic jacks with dual safety of automatic system locking and mechanical locking for jacking, with mechanical jacks featuring automatic follow-up functions providing real-time "escort," totaling 162 jacks performing proportional synchronous jacking. At the same time, a PLC control system was used with displacement and jacking force dual-control technology, achieving synchronous control precision of ±1.0mm and pressure sensor precision of ±0.2Mpa, ensuring the entire jacking process was safe and precise. These technological breakthroughs enabled the project to reduce solid waste by approximately 97% compared with traditional solutions, lower resource consumption by at least 60%, and save about 50% of the construction period, demonstrating the exemplary effect of green construction.

High-quality pavement surfacing construction is key to enhancing the public's driving experience. In the asphalt paving construction of the Jungong Road main-line elevated section, Tunnel Engineering Co., Ltd. Shanghai Road & Bridge adopted an asphalt paving system of GA-10 (cast asphalt mixture) + SMA-13 (asphalt mastic stone mixture).

Unlike conventional asphalt mixtures, the cast asphalt used this time has an internal void ratio close to zero and excellent impermeability, effectively preventing "water damage" to the asphalt mixture. In addition, the higher asphalt content gives the paving layer good flexibility under the effects of climate and traffic conditions, allowing it to adapt to the repeated bending deformation characteristics of the Jungong Road steel plate composite girders and avoid damage such as cracking of the asphalt layer.

Compared with ordinary asphalt pavement, this asphalt paving system has significant deformation resistance and rutting resistance, effectively improving pavement durability and ensuring long-term high-quality use of the main-line elevated section.

In addition to construction, Tunnel Engineering Co., Ltd. also undertook the important task of material supply for the Jungong Road main-line elevated section. During construction, Tunnel Engineering Co., Ltd. Urban Construction Materials cumulatively supplied over 68,000 cubic meters of various types of concrete, including more than 6,700 cubic meters of C60-grade special concrete, injecting strong momentum into the expressway construction.

During the supply process, due to the narrow construction site and busy surrounding traffic, tanker dispatch and unloading efficiency were limited. Tunnel Engineering Co., Ltd. Urban Construction Materials innovatively created the "Concrete Core" intelligent dispatch system, which connects in real time with construction progress and traffic conditions, optimizes transport routes, and achieves "dispatch on demand, unload upon arrival," ensuring continuity of project construction. In the wet joint pouring of crash barriers, the minimum spacing of internal reinforcement in the joints was only 3cm and the construction opening only 8cm, placing extremely high demands on self-compacting concrete. Tunnel Engineering Co., Ltd. Urban Construction Materials strictly selected high-quality aggregates, continuously optimized mix proportions through testing, adapted mix proportions that met construction requirements, and arranged dedicated personnel for on-site coordination, ensuring the smooth completion of pouring.