Laser Tunnel Inspection Vehicle in Large-Scale Use

iRoad's fully automatic laser tunnel inspection equipment is now used in tunnel maintenance projects in many provinces and cities.

The challenge

Traditional tunnel inspection relies on manual work: it is labor-intensive, slow, subjective and often requires closing the tunnel, which disrupts traffic and adds cost.

How the system works

The equipment combines three technologies:- High-precision laser scanning for millimeter-level cross-section measurement of the tunnel lining- High-definition cameras that record the lining surface for crack, leakage and spalling identification- AI recognition software, trained on large numbers of tunnel defect samples, that automatically identifies, classifies and counts defects

It works at normal traffic speed, with no road closure and no close-range manual inspection. A single pass collects lining cracks, water leakage, spalling, cross-section deformation, flatness and structural thickness at the same time.

Reports and data

The system automatically generates standardized inspection reports showing the location, size and risk level of each defect, and compares results with previous inspections to track how defects develop.

Results

The equipment has been used in mountain expressway tunnels, urban tunnels and underpasses. It increases inspection efficiency per tunnel several times over, with higher defect recognition accuracy than manual inspection and lower labor cost and safety risk.

Related product: Comprehensive Intelligent Tunnel Inspection Vehicle