Comparing Foundation Construction Standards for Distributed Photovoltaic Engineering
To address the issues of low technical thresholds,the lack of widely recognized construction process standards,and the problems of poor design capabilities,low technical levels,and unstable quality in some distributed photovoltaic projects,a systematic set of engineering quality standards was summarized.Technical specifications for buildings and structures,load report format,and load requirements for steel workshop building and cement roofs were determined.For accessible cement roofs,the load-bearing capacity was set at approximately 200 kg/m2,four times that of non-accessible cement roofs.The original roof load was increased with the addition of photovoltaic modules and pedestals.Basic process standards for color steel tile and cement roof construction were clearly defined.The construction of counterweight bases on flat cement roofs was carried out in accordance with requirements for cross-sectional size deviation within±10 mm,surface flatness within±5 mm,horizontal deviation of embedded parts within＜3 mm,and waterproof materials extending 10 cm beyond the edge of the base.Norms for the handling,stacking,pressing,and fixing of components were specified.M8 bolts were to be used for module clamps,with a torque range of 12-16 N·m.An overlap of 8-11 mm with the module frame was maintained by the clamps,and the compression length of a single clamp was set at ≥60 mm.Detailed quality improvement measures were summarized,including the requirement that the width of maintenance walkways be set at ≥ 500 mm for main channels and ≥400 mm for branch channels.The resistance of the lightning protection grounding was required to be less than 4 Ω,and MC4 connectors were to use original connectors from the module manufacturer,with a connection force of ≥310 N and a torque of 2.0-3.0 N·m.By standardizing these aspects of engineering construction,improvements in the construction quality of distributed photovoltaic stations were achieved,safety risks and equipment failure rates during operation were reduced,and the overall lifecycle performance of distributed photovoltaic stations was enhanced.
distributed photovoltaicloads and reinforcementbuilding integrated photovoltaic(BIPV)process standardsconstruction management
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