GB/T 43746.2-2024 in English

Analysis of Standard Background and Technology Evolution

With the continuous improvement of the mechanization of construction, the safety of drilling and foundation construction equipment has become a focus of industry attention. The GB/T 43746 series of standards "Safety Requirements for Drilling and Foundation Construction Equipment" is a safety specification for different types of drilling rigs, of which Part 2 is specifically for mobile drilling rigs for construction (torque less than \(35 \mathrm{kN} \cdot \mathrm{m}\)). Based on the general requirements of GB/T 43746.1, this standard adds specific clauses applicable to mobile drilling rigs to ensure the safety and reliability of the equipment in complex and changing construction site environments.

Protective device (FOPS): a structure used to prevent falling objects from causing harm to people on the platform. For example, in rock drilling operations, FOPS of level II that meets the acceptance criteria specified in GB/T 17771 is selected to ensure safety in high-risk areas.

Additional trigger device: Sensors installed on both sides of the drill pipe are used to detect accidental contact and immediately stop the rotating power head. Case: When a single-direction tilting drill rig is used on a construction site, at least one additional trigger device is installed on each side to cover the maximum drill pipe diameter to effectively prevent entanglement hazards.

Special protection mode: When the drill rig is at a specific initial speed, the additional device is released or triggered by the hold-and-run control to ensure that the rotating part stops in less than one turn. For example, when using an advance reinforcement drill rig in a narrow tunnel, this mode is enabled to deal with emergencies.