Abstract
Accurate guide rail alignment is critical for ensuring ride quality, reliability and safety in high-rise and high-speed lifts. Misalignments can occur not only post-installation but also over the system's lifespan, posing significant challenges for measurement and rectification using conventional methods, which are often time-consuming and complex.
This paper introduces a high-speed hoistway scanning system that captures precise data on essential shaft elements, including guide rails, guide rail fixations, and landing doors. By enabling rapid, detailed analysis even in the tallest buildings, the system accelerates engineering workflows. This is particularly valuable when used as an integral part of rectification work on the shaft system.
To achieve high-speed scanning, the system employs specialised multi-channel data tracking and advanced signal processing. We provide a brief overview of its structure and performance, along with case studies and measurements from landmark buildings: one that was formerly Asia's tallest building and another with a hoistway exceeding 300 meters. These examples identify and quantify common patterns of rail misalignment observed in practice, demonstrating the system's usage.