Home / Standards / GB/T 37439-2019 GB/T 37439-2019 Active Precast post-tensioned prestressed concrete simply-supported beam of high-speed railway 高速铁路预制后张法预应力混凝土简支梁 Standard Type GBT ICS 45.040 CCS S05 Status 现行 Issue Date 2019-05-10 Implementation 2019-12-01 Responsible Dept 国家铁路局 Drafting Unit N/A