Xuzhou Metro Line 2 Shield Tunnel Glass Fiber Rebar
Project Background
Xuzhou Metro Line 2 is a north-south backbone corridor of the city, with multiple segments constructed using tunnel boring machines (TBMs). The TBM launch and reception shafts utilize diaphragm walls for support, and temporary glass fiber-reinforced polymer (GFRP) bars are installed in certain areas to facilitate wall breaking. Traditional steel reinforcement bars are difficult to cut during TBM passage, significantly hindering construction progress.
Technical Challenges
- 1The material in the shield tunneling breakthrough zone must be easily machinable to prevent damage to the shield cutter.
- 2The retaining structure must meet temporary support strength requirements while ensuring smooth shield tunneling.
- 3Underground environments are damp; materials must have excellent durability.
- 4High construction precision required; rebar positioning must be accurate.
Solution
The project utilizes our company's shield tunneling-specific glass fiber-reinforced polymer (GFRP) bars, specifically designed for shield launch and reception shafts. These bars offer high strength and easy cuttability. With a tensile strength exceeding 800MPa, they meet the temporary load-bearing requirements of the retaining structure. When contacted by the shield cutterhead, the bars can be directly cut without damaging the cutting tools. Prefabricated to design specifications in the factory, these bars are simply tied and installed on-site, ensuring efficient construction.
Technical Specifications
- Fiberglass Rebar Specifications: φ22mm / φ25mm
- Tensile Strength: ≥800 MPa
- Shear strength: ≥120 MPa
- Modulus of Elasticity: ≥50 GPa
- Density: approximately 1/4 that of steel, making it easy to transport and install.
- Machinability: Tunnel boring machine (TBM) cutterheads can be machined directly without damage.
Project Outcomes
120 tons
Total Usage
6
Service Interval
100%
TBM tunneling success rate
Approximately 40%
Boost Construction Efficiency
Customer Reviews
"Sunde New Material's GFRP bars for shield tunneling deliver superior performance, fully meeting wall-breaking construction requirements. Factory-prepared with consistent quality, they are easy to install on-site. During tunneling through the shield, cutting was smooth with no damage to cutting tools, effectively safeguarding project progress. We continued using their products for subsequent contract sections."
Chief Engineer Li
TBM Construction Technical Lead
Why Choose Anhui Sende New Material Technology Development Co., Ltd.
Over a decade of industry expertise
Established in 2017, we specialize in the R&D and production of fiber composite materials. We hold National High-Tech Enterprise certification and have passed annual reviews for six consecutive years.
Fully certified
Holds 7 invention patents, 19 utility model patents, and 14 Mine Product Safety Mark certificates; certified under the ISO9001 quality management system.
Custom Manufacturing
Own production facility of 17000 square meters, capable of customizing products in various specifications and shapes to meet diverse engineering requirements.
Professional technical team
Backed by an experienced R&D team, we provide end-to-end technical support—from solution design to construction guidance.
Stable delivery capability
Annual capacity of over 10000 tons with ample inventory ensures rapid order fulfillment and uninterrupted project timelines.
1000+ Engineering Validation
Widely used in subway, tunnel, mining, and water conservancy projects. Trusted by major state-owned enterprises including China Railway, China Construction, and China Communications, with a proven track record.
