ISO 19426-2:2018

Overview

ISO 19426-2:2018 - "Structures for mine shafts - Part 2: Headframe structures" specifies the design loads and design procedures for structural design of mine shaft headframes and their components for both permanent and sinking operations. The standard covers all structures and foundations at the head of vertical and decline shafts required to support and install winding and sinking ropes, conveyance and rope guides, rubbing ropes, loading/unloading equipment, safety devices and ancillary sinking/maintenance equipment, including bank and sub-bank levels. It adopts a limit states design philosophy and does not address operational safety or headframe layout.

Key topics and technical requirements

• Design loads and categories
  • Permanent loads (structural self-weight, equipment loads)
  • Imposed loads (floor/platform, bins/chutes, conveyor and winder loads, kibble and bank door loads, abnormal and seismic loads)
  • Rope and conveyance installation loads (winding rope installation, doubling-down, tail rope, rope guides, conveyance change-over)
  • Rope operating loads (winding ropes, stage ropes, lateral loads on sheaves, rope guides and rubbing ropes)
  • Emergency loads (rope emergency loads, dropback, crash beam/catch plate, emergency arrestor anchors, energy release after rope break, dogging systems)
• Design procedures
  • Adoption of limit states design and guidance on design load combinations, partial factors and load effects
  • Requirements for overall stability and serviceability (including deflection limits)
  • Special provisions for headframe‑mounted winders
• Materials
  • Permitted structural materials include structural steel, concrete, and timber, referenced to relevant ISO material standards
• Documentation
  • Specifies reference to normative documents and symbols, and assumes local structural design standards are applied where appropriate

Applications and users

ISO 19426-2 is intended for:

• Structural engineers and geotechnical engineers designing mine shaft headframes
• Mining companies and project owners commissioning new shafts or refurbishing headframes
• Winder and shaft-equipment manufacturers integrating structural load requirements
• Consultants preparing tender documents, risk assessments and compliance reports for permanent and sinking operations Practical uses include designing foundations and headframe members, specifying load combinations for fabrication checks, and harmonizing international design practices for global mining projects.

Related standards

Relevant documents referenced by or alongside ISO 19426-2:

• ISO 19426-1 (Vocabulary), ISO 19426-3 (Sinking stage), ISO 19426-4 (Conveyances)
• ISO 22111 (Bases for design - General requirements)
• ISO 2394 (General principles on reliability for structures)
• ISO 3010 (Seismic actions)
• ISO 10721-1 (Steel structures), ISO 19338 (Structural concrete), ISO 12122-1 (Timber)

Keywords: ISO 19426-2, headframe structures, mine shaft design, design loads, rope installation loads, emergency loads, limit states design.