Home / Standards / GB/T 47056-2026 GB/T 47056-2026 Upcoming Bamboo winding utility tunnel 竹缠绕管廊 Standard Type GBT ICS 79.060.99 CCS B70 Status 即将实施 Issue Date 2026-01-28 Implementation 2026-08-01 Responsible Dept 国家林草局 Drafting Unit N/A