GRP5000 Tunnel Scanning System (2.5D)
The GRP 5000 integrates a hand-pushed track inspection trolley and high-speed laser scanning measurement technology. As the trolley moves along the track, the high-speed rotating laser scanner emits laser beams to perform full-section scanning of the tunnel surface in a spiral pattern. By analyzing the transmitted and received laser signals (intensity and phase difference), it can generate internal surface images of the tunnel lining as well as the distances from various points on the tunnel lining surface to the track centerline. It is applicable for surface defect detection, clearance inspection, tunnel deformation measurement, as well as analysis of ovality, transverse diameter convergence value and step displacement.
Surface Defect Detection
After the scanning data is processed and expanded along the tunnel vault, a digital grayscale image can be generated. This grayscale image features high clarity, which can distinguish equipment such as catenary wires and defects like cracks with a width of 0.3 mm or more. It can also be imported into the TunnelMap Tunnel Digital Management System as a basis for defect detection and management.
Clearance Measurement
It can extract the tunnel section at a specific mileage, then compare it with the pre-input vehicle clearance or equipment clearance, and automatically generate a clearance analysis diagram relative to the current position of the track. If a digital grayscale image has already been generated, it can also automatically mark the clearance-infringing areas on the grayscale image.
Shield Tunnel Deformation and Ovality Analysis
Tunnel sections are extracted at specified intervals. After data filtering (to remove noise points), ovality analysis and calculation of transverse diameter convergence values are performed. This provides a decision-making basis for maintenance management departments and lays a data foundation for the full life cycle management of tunnels.
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