Sunward Rectangular Shield Tunneling Breakthrough at Hong Kong Yuen Long South Project
Advancing Urban Underground Construction in Hong Kong
Sunward Machine has supported a major milestone in the Hong Kong Yuen Long South project, where a rectangular shield tunnel was successfully completed. The breakthrough demonstrates Sunward’s ability to provide project-oriented rectangular shield tunneling solutions for dense urban construction environments.
Yuen Long South is one of Hong Kong’s important development areas, requiring infrastructure works to be delivered with strict control over traffic disruption, ground settlement, and construction footprint. Compared with conventional open-cut excavation, a rectangular tunnel boring machine can form a box-section tunnel with high space utilization, making it well suited for underpass, utility, drainage, and underground passage works in built-up districts.
Why Rectangular Shield Technology Matters
In constrained city corridors, engineering teams often need to pass beneath existing roads, utilities, and surrounding structures while maintaining normal surface activity. Rectangular shield tunneling provides a practical trenchless construction method for these conditions by combining mechanized excavation, active face support, synchronous grouting, and controlled jacking or thrust operation.
- Efficient section utilization: the rectangular cross-section reduces unused space and is ideal for pedestrian passages, utility corridors, and shallow buried structures.
- Lower surface impact: mechanized tunneling helps reduce large-scale road opening, traffic diversion, and noise impact.
- Controlled ground response: cutterhead excavation, thrust balance, and grouting management help limit settlement in sensitive urban areas.
For Hong Kong’s compact urban setting, these advantages make rectangular shield machines a high-value solution for modern underground infrastructure.
Breakthrough ceremony for the rectangular shield tunnel section of the Hong Kong Yuen Long South project.
Professional Equipment for Complex Shallow-Buried Conditions
Rectangular shield tunneling places different demands on equipment than circular TBM construction. The machine must maintain accurate attitude control, stable excavation at the corners of the cross-section, reliable muck discharge, and precise correction capability throughout the drive. These factors are especially important when tunneling below live traffic routes or near existing underground utilities.
As a professional China shield machine manufacturer, Sunward integrates structural design, cutterhead configuration, hydraulic thrust, sealing, guidance, and on-site service into a complete underground engineering solution. This enables the equipment to adapt to local geological conditions and project constraints rather than simply delivering a standard machine.
Key Engineering Capabilities Behind the Breakthrough
Cross-Section Accuracy
The rectangular machine layout helps deliver a stable box-section tunnel while maintaining profile quality and construction precision.
Settlement Control
Face pressure, synchronized backfilling, and continuous monitoring support low-disturbance excavation beneath sensitive urban surfaces.
Site-Oriented Service
Sunward’s technical support team works with project stakeholders to align tunneling parameters, maintenance planning, and construction milestones.
Strengthening Sunward’s Global Underground Engineering Portfolio
The successful breakthrough in Hong Kong adds another practical case to Sunward’s portfolio of specialized tunnel boring machine and shield construction equipment. From rail transit and municipal corridors to utility tunnels and shallow-buried passages, Sunward continues to expand its capability in customized underground space development.
For international contractors and project owners, the Yuen Long South case shows how a purpose-built rectangular tunnel boring machine can help manage compact job sites, strict settlement requirements, and high public-interface demands while improving construction efficiency.
Rectangular Shield Machines for Urban Underground Projects
Sunward TBM provides customized shield machines, pipe jacking machines, and underground engineering solutions for rail transit, municipal infrastructure, utility corridors, and urban space development worldwide.
