钢筋抽检标准Standard for steel bar sampling.doc

钢筋抽检标准(Standard for steel bar sampling)(a) hot rolled bar1, the group rulesWith the same brand, the same stove number, the same specifications, the same delivery status, no more than 60 tons for a number of.2, sampling methodThe tensile test: choose two steel cut・ Two samples, sample length 500mm.Cold test: choose two steel cut from two samples, test length calculated:L=l.55* (a+d) +140mmType: L sample lengthA 一 nominal diameter steelD 一 bending test bending center diameter; press table accessReinforced grades (grade IIPB235) (grade I) IIRB335 IIRB400 IIRB500Nominal diameter (mm) of 8、206、2528 ~ 506 〜2528、506 ~ 2528 、 50D 1A 3A 4A bend diameter 4A 5A 6A 7aIn the sample cut, should be reinforced at the end of the 500mm removed after re cut・(two) low carbon steel wire rods1, the group rulesWith the same brand, the same stove number, the same species, the same size, same condition of delivery, no more than 60 tons for a number of.2, sampling method:Tensile test: choose a dish, cut a specimen from either end of the disc, the sample length of 500mm・Bending test: choose two disc, take a sample from either end of each cut per plate, sample length 200mm・In the sample cut, should be the end of 500mm removed after re cut・(three) cold drawn low carbon steel wire1, the group rulesA steel wire by plate test・ With a diameter of 5 tons of steel grade for a number of optional three disc test・ 2, sampling method From the end of each office amputated not less than 500mm, and two samples of a stretch, a repeated bending, tensile specimen length 500mm, repeated bending specimen length 200mm・(four) cold rolled ribbed barThe mechanical properties and processing properties of 1 cold-rolled ribbed bars by plate test, since each disk at either end of two truncated 500mm samples, tensile specimens of long 500mm, long 200mm cold bending specimen.2, to supply 550 bundles of cold rolled ribbed bar by bundle test・ With a steel on interception of two specimens, from which each bundle, tensile specimen of long 500mm, long 250mm cold bending specimen. If a test results reach the standard・ We should take the bundles of steel double samples for re inspection.(five) sampling steel welded jointsAccording to the provisions of A, sampling ["Specification for welding and acceptance" (JGJ18-2003)]1, reinforced flash butt welding joint sampling requirementsA in the same stage, completed by the same welder 300 grades, with the same diameter of welded steel joints should be as a group・ When the same number of welding quantity is less, can be accumulated within a week; the total still less than 300 joints, should according to the number of calculation.B mechanical performance test, from each batch of joint random cut of 6 specimens, of which 3 tensile test, 3 bending test・C welding length of prestressed reinforcement (including steel rod and screw end), according to the same conditions when making production simulation specimens.D screw rod joint can only end tensile test・E sealing ring stirrups of butt weld,In 600 the same grade, with the specifications of the joint is a group, only do the tensile test・When the f simulation test results do not meet the requirements, should be rechecked・ The reinspection should live in the welding joint is cut, the number and the same initial requirements and test・2, reinforced joint sampling rulesA in cast-in-situ concrete structure, should be 300 of the same grade, the same type of joint as a group; in the housing structure, should not exceed two floors in 300 of the same grade, the same type of joint as a group・ Each group randomly cut 3 joints, tensile test・B in the assembly type structure, according to the production conditions of making the simulated specimen, each batch of 3, tensile test・C steel and steel plate arc lap welding head can only carry out visual inspection.D simulation specimens and the number of requirements should be cut from the finished product with the same・ When the simulation test results do not meet the requirements, reinspection should be cut from the finished product, the same number and initial test・Note: in the same batch if there are several different diameter steel welded joints, should be in the maximum diameter of joints excised in 3 specimens・The first sampling provisions 3 steel bar electroslag pressure weldingIn the cast-in-pla.ce concrete structure, should be the same 300 grades of steel joint as a group; in the housing structure, should not exceed two floors in the same 300 grades of steel joint as a group; when less than 300 joints, should still be regarded as a group・ Random cut for each batch of joint in 3 specimens tensile test・Note: in the same batch if there are several different diameter steel welded joints, should be in the maximum diameter of joints excised in 3 specimens・4, reinforced air pressure welding head sampling requirementsA in cast-in-situ concrete structure, sho。