Safety Inspection Requirements for LED Sky Screen Project Engineering

In recent years, with socio-economic development and technological advancement, LED sky screens have become widely known. They perfectly integrate LED display technology with architectural aesthetics, and have gradually evolved into iconic landmarks reflecting regional economic development levels.During service and operation, regular structural safety inspection and appraisal are mandatory for LED sky screen projects. Relevant analysis shall be conducted on structural safety and durability, covering visual appearance inspection, parameter testing and damage assessment of concrete-filled steel tubular columns and pipe trusses. Safety evaluation shall be formulated based on test data together with reasonable suggestions, providing valuable references for quality inspection of similar projects.

Most LED sky screens are built in bustling commercial hubs and densely populated areas. Any hidden engineering quality hazards will pose severe threats to surrounding buildings and personal safety, hence structural inspection and appraisal are essential. This paper conducts safety appraisal and structural analysis on an actual LED sky screen project, and the adopted testing methods and procedures can serve as effective references for similar structural inspections.

Check cracks at the joints between steel columns and the ground of the LED sky screen project. Verify whether there are settlement cracks, deformation and displacement at the connection parts of concrete-filled steel tubular columns and the ground. Confirm the upper structure operates normally without obvious inclination, displacement or settlement-induced cracks.

Investigate the layout of all project components. Select 8 concrete-filled steel tubular columns and 8 pipe truss members for section dimension measurement using steel tapes, vernier calipers, ultrasonic thickness gauges and other tools. All measured dimensions comply with design specifications.

Adopt prism-free total station to test camber and verticality of 8 selected steel columns. The measured camber deviation ranges from 1mm to 5mm, and verticality deviation is between 0.9mm and 20.6mm, all below the limit values specified in Code for Acceptance of Construction Quality of Steel Structures (GB50205-2001).

Use TT260 coating thickness gauge to test anti-corrosion dry film thickness on 30 selected pipe truss members. In accordance with GB50205-2001, the standard thickness is 150μm for outdoor use and 125μm for indoor use, with a permissible deviation of -25μm. All tested samples meet the requirements.

Digital ultrasonic flaw detectors are used to inspect 48 butt welds and fillet welds. All tested welds reach Grade II weld quality standard.

Carry out overall inspection including connector rusting, steel member wrinkling, sagging, peeling, re-rusting, cracks and structural deformation, as well as water seepage conditions.

To sum up, construction quality, welding technology, corrosion, deformation and uneven foundation settlement are major safety risks affecting LED sky screen structures. Scientific and systematic structural appraisal and analysis are highly required. To ensure stable and safe operation, routine maintenance together with professional regular inspections shall be implemented, and timely troubleshooting shall be carried out to achieve optimal maintenance throughout the whole service life.

The exquisitely designed transparent LED sky screens beautify urban landscapes and create innovative advertising forms. The transparent LED screens are nearly invisible when powered off, blending seamlessly with buildings, blue sky and white clouds. While shopping, dining or strolling around, visitors can enjoy bright sunshine in the daytime and magnificent colorful sky screen visuals at night, adding romantic and fantastic vibes to leisure trips and gatherings.

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