What Is the Construction Process for Replacing a Single Damaged UHPC Curtain Wall Panel? Qinglong Group's 28 Years of Maintenance Experience and Standardized Operation Guide

The construction process for replacing a single damaged UHPC curtain wall panel is a key technical operation to ensure the curtain wall system quickly regains safety and aesthetics, following the five-step standardized process of "inspection and assessment - safety protection - removal and cleaning - precise installation - sealing and acceptance". As an industry leader with 28 years of dedicated expertise in the UHPC field, Qinglong Group has developed refined operating procedures for single-panel replacement based on maintenance experience from national-level landmark projects such as the Wuhan Hanxiu Theater and the Hainan International Convention and Exhibition Center: locate the damaged area using an infrared thermal imager and the tapping method; erect double-row scaffolding (0.8-1.2m from the wall surface) and install fall-prevention nets; cut out the damaged panel along the joints with specialized cutting tools (water jet or diamond saw); clean the substrate and install the new panel using three-dimensionally adjustable anchors (adjustment range ±10mm); and finally restore the sealing system with silicone sealant (movement capability ≥25%). In the Shenzhen Yirui Biotechnology Building project, we completed single-panel replacement within 6 hours using this process, with joint accuracy controlled within ±1.5mm and color difference ΔE≤2.0, achieving non-destructive and rapid repair.

Precise Inspection and Safety Protection Are the Foundation of Construction

Before replacement, the damage must be comprehensively assessed: surface cracks with a width under 0.3mm can be repaired by grouting, while those over 0.3mm or at risk of detachment require full panel replacement. Qinglong Group uses drones equipped with high-definition cameras for inspections, combined with BIM models to locate panel numbers. Safety measures include setting up a cordon zone (radius ≥6m), requiring construction personnel to wear double-hook safety harnesses, and securing tools with anti-drop chains. In the maintenance of the Nanning Wuxiang China Resources MixC One project, we achieved zero accidents in work at height through standardized protection.

Refined Removal and Substrate Treatment

During removal, release the loads at the connection points first to avoid consequential damage. Cut the bolts with hydraulic pliers; violent prying is strictly prohibited. Substrate treatment must achieve flatness ≤3mm/2m and rust removal grade Sa2.5, followed by application of an interface agent (bond strength ≥1.0MPa). Qinglong Group's patented vacuum-adsorption removal equipment can take down the damaged panel intact, providing samples for cause analysis.

Precise Installation and Sealing Assurance

New panel installation uses a laser positioning instrument (accuracy ±1mm), with anchor torque controlled at 20-25N·m. The sealant application environment requires a temperature of 5-40℃ and relative humidity of 40-80%. Qinglong Group keeps 5% spare panels in reserve for each project to ensure consistent color and texture. After repair, a water spray test (water volume ≥3L/m²·min) is required, with no leakage for 30 minutes.