GB Standard Drawing 15J401 Ladder Cage

Updated: 2026-08-07

Overview

The GB Standard Atlas 15J401 Climbing Ladder with Safety Cage is a government-standardized industrial ladder system widely adopted in China for vertical access in high-risk environments. It integrates a rigid ladder with a cylindrical safety cage to prevent falls, complying with GB 15J401 technical specifications and international safety standards like EN ISO 14122-4. Designed for durability, it is commonly fabricated from galvanized steel or stainless steel to resist corrosion in outdoor or humid conditions. Typical applications include access to water towers, industrial silos, and maintenance platforms in power plants or chemical facilities.

Structure and Working Principle

The system consists of three core components: the vertical ladder (rung spacing 300 mm ±5 mm), the surrounding safety cage (diameter ≥700 mm), and anchor brackets for structural attachment. The cage’s hooped design ensures a climber remains within a protected zone even if balance is lost. The ladder’s load-bearing capacity exceeds 300 kg, with rungs featuring anti-slip grooves or coatings. Anchoring follows GB 50017 steel structure standards, requiring bolt-on or weld-on installation to beams or walls. Modular designs allow customization for heights up to 20 meters.

Key Features

Standardization under GB 15J401 ensures uniformity in dimensions, materials, and safety margins, simplifying procurement and compliance audits. The galvanized steel variant offers a cost-effective solution with a zinc layer of ≥80 μm for rust resistance. Safety enhancements include mandatory cage height (≥2.2 meters above platform), 4–6 mm thick steel rungs, and smooth interior surfaces to prevent snagging. Optional accessories include rest platforms (every 6–9 meters) and lightning protection for tall installations.

Application Areas

This ladder system is indispensable in industries requiring frequent elevated access, such as petrochemical plants (for tank inspection), grain storage silos, and telecommunications towers. It is also specified in public infrastructure like bridge pylons and hydropower stations. In B2B contexts, buyers often procure these ladders as part of larger safety retrofits or new construction projects, with demand driven by stricter enforcement of occupational safety regulations in China and export markets.

Maintenance and Precautions

Routine inspections should check for rust (especially at welds), loose bolts, or cage deformation. Annual load testing is recommended for high-traffic installations. Avoid abrasive cleaners that damage galvanization. Installation requires certified professionals to ensure proper anchoring and alignment. Non-compliant modifications (e.g., removing cage sections) void safety certifications and increase liability risks.

B2B Procurement Guide

Buyers should verify suppliers’ GB 15J401 compliance through factory audits or third-party certifications like CE/ISO. Bulk orders (10+ units) often qualify for 10–15% discounts, with lead times of 4–8 weeks for custom heights. Key negotiation points include material thickness tolerances (±0.5 mm), packaging for corrosion protection during shipping, and after-sales support for installation guidance. Compare FOB prices from Jiangsu/Shandong manufacturers, where industrial clustering reduces costs.