Inspection items and sampling methods of steel structure
| Material name | Test content | According to the standard | Sampling method | Batch or inspection quantity |
| All kinds of steel | tensile strength
Bending test |
Steel standard GB / t1591-1994
GB/T700—2006GB/T699-1999 |
Take 300 * 30 test pieces, two for each specification | 60t |
| Weldment | tensile strength test | JGJ81-2002 | 3 pieces for each specification | —— |
| High strength bolt | Torque coefficient
Minimum tensile load |
GB50205-2002 GB/T3098.1-2000 | 8 pieces for each specification | 5000 pieces below M36
2000 pieces above M36 |
| High strength bolt connection surface | Anti slip coefficient | GB50205-2001 | Three groups for each specification | Each batch of 2000t |
| Weld quality | NDT for internal defects | GB50205-2001
JG/T203-2007 |
On site inspection | 100% flaw detection for grade I weld
20% flaw detection for secondary welds |
| Safety and function inspection of steel structure engineering | Weld appearance
defect detection |
GB 50205-2001 and appendix a0.1 | On site inspection | 10% no less than 10 places |
| Weld size inspection | GB 50205-2001 and appendix a0.2 | |||
| Construction quality of high strength bolt: final tightening torque | GB50205-2001 | On site inspection | 3% and no less than 3 nodes are randomly selected | |
| Anchor bolt fastening test (pull-out test) | GB50205-2001 | On site inspection | According to the number of column bases, 10% and no less than 3 | |
| Verticality of steel column
Direction finding bending of steel beam |
GB50205-2001 | On site inspection | 10% of the similar components shall be sampled for no less than 3 pieces | |
| Overall verticality
Overall plane bending |
GB50205-2001 | On site inspection | —— | |
| Fireproof coating
Thickness inspection |
GB50205-2001 | On site inspection | —— |
| Material name | Test content | According to the standard | Sampling method | Batch or inspection quantity |
| Various steels | tensile strength
Bending test |
Steel standard GB / t1591-1994
GB/T700—2006GB/T699-1999 |
Take 300 * 30 test pieces, two for each specification | 60t |
| Various steel pipes | tensile strength test | Low pressure fluid pipe: GB / t3091-2001
And various steel pipe standards |
Take 300 * 30 test pieces, two for each specification | According to the standard requirements |
| Weldment | tensile strength test | JGJ81-2002 GB50205-2001 | 3 pieces for each specification | —— |
| Welded ball joint | Bearing capacity test | JGJ78-1991/ JG11-1999 | According to the maximum bolt hole thread of ball; take 3 pieces of each specification | 600 pieces of each specification |
| Weld quality | NDT for internal defects | GB50205-2001
JG/T203-2007 |
On site inspection | 100% flaw detection for grade I weld
20% flaw detection for secondary welds |
| Weld ball weld | Flaw detection | GB50205-2001 | No less than 3 for 5% of each specification | |
| Safety and function inspection of steel structure engineering | Weld appearance defect detection | GB 50205-2001 and appendix a0.1 | On site inspection | 10% no less than 10 places |
| Weld size inspection | GB 50205-2001 and appendix a0.2 | |||
| Inspection of anchor bolt and fastening of grid support | GB50205-2001 | On site inspection | 10% and no less than 3 bearings shall be sampled | |
| Inspection of base plate and cushion block | ||||
| Thickness inspection of fireproof coating | GB50205-2001 | On site inspection | No less than 3 pieces with 10% spot check | |
| Deflection measurement of grid structure | GB50205-2001 | On site inspection | If the span is less than 24m, measure one point of the central lower chord, and if the span is greater than 24m, measure the quarter point of the span of the bottom chord in each direction |
| Material name | Test content | According to the standard | Sampling method | Batch or inspection quantity |
| Various steels | tensile strength
Bending test |
Steel standard GB / t1591-1994
GB/T700—2006GB/T699-1999 |
Take 300 * 30 test pieces, two for each specification | 60t |
| Various steel pipes | tensile strength test | Low pressure fluid pipe: GB / t3091-2001
And various steel pipe standards |
Take 300 * 30 test pieces, two for each specification | According to the standard requirements |
| Weldment (cone head
Sealing plate) |
tensile strength test | JG10-1999 | 3 pieces for each specification | —— |
| Bolt ball joint | Bearing capacity test | JGJ78-1991/ JG10-1999 | According to the maximum bolt hole thread of ball; take 3 pieces of each specification | 600 pieces of each specification |
| Weld quality | NDT for internal defects | GB50205-2001
JG/T203-2007 |
On site inspection | 100% flaw detection for grade I weld
20% flaw detection for secondary welds |
| Safety and function inspection of steel structure engineering | Construction quality inspection of bolt ball joint | GB50205-2001 | On site inspection | Spot check 3% according to the number of nodes, and no less than 3 |
| Weld appearance defect detection | GB 50205-2001 and appendix a0.1 | On site inspection | 10% no less than 10 places | |
| Weld size inspection | GB 50205-2001 and appendix a0.2 | |||
| Inspection of anchor bolt and fastening of grid support | GB50205-2001 | On site inspection | 10% and no less than 3 bearings shall be sampled | |
| Inspection of base plate and cushion block | ||||
| Thickness inspection of fireproof coating | GB50205-2001 | On site inspection | No less than 3 pieces with 10% spot check | |
| Deflection measurement of grid structure | GB50205-2001 | On site inspection | If the span is less than 24m, measure one point of the central lower chord, and if the span is greater than 24m, measure the quarter point of the span of the bottom chord in each direction |
Inspection items and important equipment of steel structure engineering
| Serial number | Project name / parameters | test method | Main instruments and equipment | |
|
1 |
Nondestructive testing of welding quality of steel structure | Radiographic inspection | X-ray flaw detector | |
| ultrasonic examination | Ultrasonic flaw detector | |||
| Magnetic particle inspection | Magnetic particle flaw detector | |||
| Penetrant inspection | Permeameter | |||
| 2 | Anti corrosion and fireproof coating test of steel structure | Coating thickness gauge | ||
| 3 | Steel structure joint | Bearing capacity | We-1000 universal testing machine | |
| Standard fasteners and high strength bolts for mechanical connection
Mechanical property test |
Pretension | Axial force tester, torque tester | ||
| Wedge load | We-1000 universal testing machine | |||
| Torque coefficient | Torque tester | |||
| Anti slip coefficient | We-1000 universal testing machine | |||
| Bearing capacity | We-1000 universal testing machine | |||
| 4 | Deformation detection of steel grid structure | Precision level, theodolite
(total station) |
||
| 5 | Mechanical properties of steel and steel castings | We-1000 universal testing machine | ||
Post time: Jul-10-2020