The Yangzhou Dilong EPB3200 earth pressure balance pipe jacking machine has been successfully deployed for the water environment improvement project of Jinzhai Road Interception and Regulation Pipeline Network in Hefei. It participated in the full-length 3.29 km trenchless tunnelling construction of municipal pipelines and successfully completed tunnelling tasks involving complex crossings across multiple sections, providing core equipment support for the orderly advancement of the urban water environment treatment project.

As a key municipal water environment improvement project in Hefei, the project features complicated and variable construction conditions. The tunnelling route passes beneath urban arterial roads twice and crosses the Shiwuli River six times. The urban area sees uneven stratum distribution and diverse geological conditions. Frequent crossing construction beneath roads and rivers imposes high standards on equipment in terms of stratum adaptability, long-distance tunnelling stability, alignment control precision and on-site construction safety. Conventional construction equipment cannot meet the requirements for efficient and safe construction under such complex working conditions.

To tackle the challenges brought by the complicated urban construction environment, variable geological conditions and repeated crossings, Yangzhou Dilong Machinery adopted the EPB3200 earth pressure balance pipe jacking machine tailored to the project’s route parameters and core demands of water environment treatment. Fitted with an optimised earth chamber pressure balance control system, the machine is highly suitable for tunnelling in urban soft soil strata and effectively improves muck transportation and treatment capacity during long-distance construction. The overall machine structure adopts refined optimisation design, perfectly adapting to the layout of working shafts on site. It delivers outstanding attitude adjustment and deviation correction performance, fully satisfying the complex construction requirements of repeated undercrossing of rivers and roads.

During the full 3.29 km long-distance tunnelling construction, the EPB3200 earth pressure balance pipe jacking machine maintained stable operation and steady tunnelling performance. It successfully overcame difficulties arising from multiple intersecting crossings and realised continuous, safe and efficient tunnelling along complex routes. Meanwhile, equipped with a complete intelligent tunnelling parameter monitoring system, the machine collects and monitors core construction data including tunnelling pressure, advance speed and equipment attitude in real time, enabling dynamic control throughout construction. This significantly enhances on-site construction safety and refined management efficiency, and fully demonstrates the process advantages of trenchless pipe jacking construction including low disturbance, high precision and high reliability.

The successful and stable application of the EPB3200 pipe jacking machine in the Jinzhai Road pipeline project in Hefei effectively guarantees the construction schedule and engineering quality, and consolidates the equipment foundation for urban sewage treatment, waterlogging prevention and improvement of aquatic ecological environment. Going forward, Yangzhou Dilong Machinery will continue to provide professional on-site technical guidance and all-round construction support services. With mature trenchless equipment portfolio and systematic technical services, the company will facilitate the safe and efficient delivery of urban municipal pipeline upgrading and water environment improvement projects.