A total sample of Beijing, Tianjin, Hebei, Shanxi, Inner Mongolia, Liaoning, Jilin, Heilongjiang, Shanghai, Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Shandong, Henan, Hubei, Hunan, Guangdong, Guangxi, Hainan, Chongqing, Sichuan in 2018 , Guizhou, Yunnan, Shaanxi, Gansu, Ningxia, Xinjiang and other 29 provinces, autonomous regions and municipalities, 1128 batches of water pipe products produced by 1,28 enterprises in the municipality, including self-stressing concrete pipes, prestressed concrete pipes, prestressed steel concrete pipes, steel bars Concrete drainage pipe, glass fiber reinforced plastic sandwich sand pipe and other 5 varieties.
This random inspection is based on GB/T 4084-1999 "Self-stress Concrete Water Pipe", GB/T 5696-2006 "Prestressed Concrete Pipe", GB/T 19685-2005 "Prestressed Steel Tube Concrete Pipe", GB/T 11836 -2009 "Concrete and reinforced concrete drainage pipe", GB/T 21238-2016 "Glass fiber reinforced plastic sand pipe", GB/T 15345-2003 "Test method for concrete water pipe", GB/T 16752-2006 "Concrete and Test method for reinforced concrete drainage pipe, GB/T 5352-2005 "Test method for load-carrying properties of parallel plates of fiber-reinforced thermosetting plastic tubes", GB/T 2576-2005 "Test methods for insoluble content of fiber-reinforced plastic resins", GB/T T 2577-2005 "Test methods for content of glass-reinforced plastics resin" and other standards, hydrostatic test for water delivery pipe products, thickness of protective layer, impermeability, crack resistance internal pressure, cracks, internal pressure crack resistance or outside Pressure Crack Resistance, Pipe Body Cracks, External Pressure Loads, External Surface Cracks, Bars, Inner Liner Thickness, Resin Insolubles, Straight Pipe Section Components, Initial Ring Stiffness, Initial Circular Tension Strength, Initial axial tensile strength and tensile strain at break, initial scratch , Initial ring flexural strength was tested 18 projects.
Spot checks found that 82 batches of products did not meet the requirements of the standard, involving the thickness of the protective layer, external pressure load, external surface cracks, exposed ribs, the thickness of the inner lining layer, the composition of the pipe wall of the straight pipe section, and the initial circumferential tensile strength. Initial axial tensile strength and tensile strain at break, initial deflection, initial hoop bending strength.
In addition, Luzhou Suxian District Shibao Pipe Plant and Luzhou City Development Zone Wantong Cement Products Factory refused inspection in this national supervision and inspection.