Rail Transit Polyurethane Damping Solution
Turnkey equipment and process engineering for high-speed railway CRTS III track slabs and metro track beds. Delivering 60 kg/min dynamic shear grouting for void-free, long-life vibration mitigation.
Engineered Polyurethane Damping for High-Speed and Urban Rail
Modern high-speed railway corridors and urban rail networks generate severe dynamic wheel-rail impact forces. Ballastless track slabs require continuous, elastic cushion layers that decouple track structures from viaduct concrete, absorbing acoustic vibration and preventing track bed degradation. Traditional cementitious asphalt mortars suffer from brittle cracking, water erosion, and complex field curing. Haifeng’s Rail Transit Polyurethane Damping Solution delivers in-situ microcellular polyurethane grouting equipment that creates resilient, long-lasting ballastless track beds with verified zero-void filling.
High-Flow Laminar Void Elimination
The system delivers up to 60 kg/min of homogeneous polyurethane slurry, filling a 5.6-meter-long track slab within 3.5 minutes to prevent gelling fronts and air voids.
All-Weather Field Stability
Jacketed chemical tanks and heated delivery hoses maintain precise fluid temperatures up to 60°C, ensuring consistent reaction kinetics across freezing trackside environments.
Designed for both new high-speed railway projects and urban metro damping retrofits, our mobile equipment packages ensure precise stoichiometric dosing, dynamic bubble-free homogenization, and rapid cycle times under challenging trackside environmental conditions.
Complete Track Slab Cushion Grouting Workflow
A rigorous, rail-certified engineering procedure ensuring structural coupling, complete fill density, and verified acoustic damping.
Substrate Cleaning & Perimeter Sealing
The concrete track bed and underside of the precast slab are cleared of debris with compressed air, and perimeter foam gaskets are installed to seal the 30–50 mm cushion cavity.
Mobile Chemical Conditioning & Thermal Tracing
Polyol and isocyanate raw materials are heated to 35°C in onboard jacketed tanks and circulated continuously through 25-meter heated delivery lines to ensure balanced fluid viscosities.
Closed-Loop Mass-Flow Proportional Dosing
Servo-driven rotary gear pumps meter components into the delivery lines, where Coriolis mass flow meters measure mass displacement and continuously adjust pump speeds within ±0.5%.
Reference Solution Engineering Envelope
Typical performance matrix for Haifeng rail transit polyurethane grouting and damping systems.
| Parameter | Value / Unit | Applicable Configuration / Conditions |
|---|---|---|
| Continuous Discharge Rate | 10.0 to 60.0 kg/min | Variable servo-controlled gear pump displacement |
| Metering Ratio Precision | Tolerance within ±0.5% | Closed-loop Coriolis feedback across laminar flow conditions |
| Dynamic Mixing Rotor Speed | 1,500 to 4,500 RPM | Multi-stage dynamic rotor with frequency-inverter control |
| Thermal Conditioning Range | Ambient up to 60°C | Multi-zone electric and thermal fluid jacket tracing (±1.0°C) |
| Delivery Line Working Radius | 25 meters standard (Extendable) | Jacketed, electrically heated, and wear-resistant trackside hose |
| In-Situ Polyurethane Density | 0.85 to 1.10 g/cm³ | Controlled microcellular expansion without unreacted gas voids |
Core Equipment for This Solution
The Haifeng package includes the mobile high-output grouting skid, heated transfer hoses, dynamic mixing head, backpressure monitoring and agreed operator training. Road-rail carriers and diesel generators are optional. The PU grout is supplied by the selected material supplier; site lifting and compressed air are customer interfaces.
Engineering Advantages of Haifeng Rail Damping Solutions
Purpose-built features designed to conquer high cavity backpressures, cold climates, and strict railway quality audits.
Certified Void-Free Fill
High-volume dynamic mixing prevents premature gelling fronts and weld-line voids, ensuring over 99.5% ultrasonic inspection pass rates.
Rapid Slab Turnover
3.5-minute rapid injection cycles per slab allow contracting teams to complete up to 80 slabs per shift, accelerating corridor completion.
Zero Solvent Environmental Safety
Automated mechanical cut-off pistons and high-pressure air flushes eliminate solvent pollution on track beds and waterways.
Autonomous Mobile Mobility
Compact skid layouts easily integrate onto track flatcars, hy-rail vehicles, or road trailers with self-contained power generation.
Related Project Draft
Review the project configuration described in the supplied brief. Project records and reported results require verification before public use.
Frequently Asked Questions
Find answers about Rail Transit Polyurethane Damping Solution, including material selection, equipment configuration and the information needed to plan a production line.
How does high-volume grouting prevent air bubbles in track slab cavities?
Can this grouting system operate in near-freezing winter environments?
What prevents the grouting head from clogging during multi-slab shifts?
How does the equipment ensure exact 1:1 or asymmetrical mix ratios?
Request a Rail Transit Polyurethane Proposal
Submit your track project specifications, slab dimensions, and daily construction targets for a custom equipment plan.
