Photovoltaic power station how to forecast the roof load before installation?

In the height of distributed photovoltaic development, distributed photovoltaic project roof load problem, especially easy to form a larger scale of project of steel structure caigang WaWu surface load problem, a project developing a sore point for important. In open load

in the height of distributed photovoltaic development, load problem of distributed photovoltaic roof project, especially on the surface of the steel structure caigang WaWu load problem, easy to form a larger scale of project, has become a very important part in project development difficulty. Before loading certificate, how to determine in advance of the bearing capacity of the photovoltaic roof, with a rough whether it meet the requirements of the photovoltaic project? 1, photovoltaic roof load classification according to the time classification: permanent load ( Constant load) And variable load ( Live load) , accidental load ( Special load or unexpected effect) 。 Photovoltaic power station system belongs to the new type of constant load. Effect of the size classification: uniform load and concentrated load and linear load. Direction classification: the vertical load and horizontal load. 2. Distributed photovoltaic roof weight of the load on roof structure of the project: weight of reinforced concrete floor and roof insulation color steel purlin steel weight, roofing waterproof self-respect self-respect, the original roof components and equipment ( Belong to the dead load) 。 Photovoltaic (pv) power system load: photovoltaic modules, scaffolds and foundation, cable, junction box, etc. ( New constant load) 。 Wind, rain, snow load: photovoltaic power station construction caused by wind, rain, snow load increase. The construction load ( The late operation and maintenance load) : in the construction stage, hoisting transportation, equipment, materials, construction personnel, construction equipment and so on. Belong to the live load. The earthquake does not belong to the load. Earthquake is a kind of behavior. The provisions of the seismic action and checking to see GB50012010 'code for seismic design of buildings. 3. Load forecasting drawing simulation, through the structure of the structure, software ( Such as MTStool, the structure of the calibration kit, etc. ) 。 ) Preliminary calculation for main stress components ( Such as purlin, floor, etc. ) 。 Field: compare the actual architecture and design drawings, found that the load increase to the design drawings or changed by later reconstruction. Outdoor: on the roof of additional equipment, elevator, air is used to adjust between the machine or antenna, fire fighting equipment foundation or ventilation pipes, etc. Indoor: presence of large leakage, beam, plate column with and without crack, corrosion and damage, with or without new ceiling component, roof hanging equipment, opening, new indoor track crane, etc. To obtain reliable load data, should be after the field investigation, combined with the actual load condition, structure modeling system, such as accounting. 4 reinforced concrete roof, concrete roof load forecast: new photovoltaic system bearing capacity checking the percent of pass is 80%. This structure is more suitable for installation of photovoltaic power generation system. Focus on the following problem: illegal construction, with a long history of the old buildings, jerry-built jerry-built projects, such as illegal construction and affects the safety of the stress of the original building structure, and communication with the owners if there is a roof structure reconstruction plan in the future. Photovoltaic power station system also can be installed by selecting the appropriate forms for installation, such as reduced installation Angle, avoid the sensitive area, array installation guide plate, reduce the height and weight of the counterweight block, etc. Concrete roof photovoltaic system should be based on the preferred Angle of the single component for installation. Considering the concrete weight, which is about 0. 45000 Newton / ㎡.