The safety of the maintenance walkway of a photovoltaic power station is directly related to the work efficiency of equipment maintenance and operation and maintenance personnel. As the main load-bearing structure, the load-bearing capacity test standard of the maintenance walkway steel grating is particularly critical. This article will comprehensively analyze the load-bearing capacity test requirements of the steel grating of a photovoltaic power station from three aspects: load-bearing capacity standard, test method and precautions.
Design load-bearing capacity
According to the requirements of the "Code for Loads on Building Structures" (GB 50009-2012), the steel grating of the maintenance walkway must be able to withstand 1.5 times the design load to ensure safety under extreme loads.
Generally, the steel grating of photovoltaic power stations must have a uniform load-bearing capacity of 250kg/m² or more, and specific high-load scenarios may require higher load-bearing standards.
Local load test
For the local pressure of the maintenance personnel's standing point or the equipment passage point, the grating plate must withstand a concentrated load of more than 200kg at a single point without obvious deformation or fracture.
Dynamic load adaptability
In high-frequency use environments, the grating plate must undergo dynamic load testing to ensure that it will not be fatigued and damaged under multiple cycles of pressure.、
Static load test
Steps: Fix the grating plate on the support beam, evenly apply a static load of 1.5 times the design load, hold for more than 5 minutes, and observe whether permanent deformation or structural damage occurs.
Goal: Ensure that the grating plate can still maintain stability under high loads.
Concentrated load test
Steps: Apply a concentrated load of more than 200kg at a specific point on the plate (such as the center or the middle between the support points) to test the local load-bearing capacity of the grating plate.
Goal: Evaluate the grating plate's ability to resist local deformation and fracture, especially its performance in single-person operation or equipment transportation scenarios.
Fatigue test
Steps: Simulate repeated use conditions, apply multiple cycles of pressure loading to the grating plate, and observe whether cracks or performance degradation occur at the fatigue point.
Goal: Ensure that the grating plate can withstand long-term use and extend product life.
Material strength
The steel gratings are mostly made of low-carbon steel or stainless steel, and the material selection directly affects the load-bearing capacity. Hot-dip galvanizing can also improve the anti-corrosion performance, thereby indirectly extending the stability of the load-bearing performance.
Mesh size
The mesh size or pitch size of the grating plate needs to be reasonably designed. Too large may reduce the overall load-bearing capacity, while too small will increase the material usage, resulting in increased costs.
Welding quality
High-quality welding technology can ensure that the crossbar and the flat steel are firmly connected, improving the overall structural strength.
Installation method
Whether the grating plate is firmly installed on the support beam will directly affect its load-bearing performance. Improper installation may cause local force imbalance.
Test environment
The test site needs to be kept level to ensure the accuracy of the test data.
When testing in a humid or low-temperature environment, the corrosion resistance and low-temperature performance of the material should be considered.
Test tool calibration
Use certified pressure equipment to avoid test data errors.
Safety assurance
During the test process, ensure that there are no non-related personnel on the site to avoid injuries caused by accidental damage to the equipment.
The load-bearing capacity test standard of the steel grating of the maintenance walkway of the photovoltaic power station is the basis for ensuring personnel safety and stable operation of equipment. Only by strictly testing in accordance with national standards and selecting high-quality grating plates that meet the load-bearing requirements can we minimize safety hazards and improve the operation and maintenance efficiency of the power station.
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#Photovoltaic power station #Maintenance walkway #Steel grating for roof solar
