What is the construction process for replacing a single damaged UHPC curtain wall panel?

Replacing a single damaged UHPC curtain wall panel follows a six-step standardized process: "preliminary preparation → safety protection → old panel removal → substrate cleaning → new panel installation → sealing and acceptance". Relying on BIM positioning technology and specialized construction tools, Qinglong achieves precise and efficient replacement of damaged panels. The replacement of a single panel is completed within 8-12 hours, with installation accuracy of ≤±2mm, and multiple projects show no leakage or loosening issues after replacement.

I. Preliminary Preparation: Precise Adaptation and Plan Formulation

Preparation is the foundation of a successful replacement. Damage detection: locate the position and dimensions of damaged panels through 3D laser scanning, assess the extent of damage (cracks, spalling, etc.), and determine whether only a single panel needs replacement—Qinglong's scanning accuracy reaches ±0.1mm, precisely identifying damaged areas. New panel customization: based on the original project drawings and scanning data, UHPC panels of the same specifications are custom-made (matching material, thickness, and surface texture); Qinglong's new panel production cycle is ≤7 days, with a 99% match to the original panels. Plan formulation: develop a specialized construction plan specifying lifting paths, safety measures, and tool lists; Qinglong simulates the replacement process through BIM to avoid collisions and construction conflicts.

II. Safety Protection and Old Panel Removal: Safe Detachment Without Damage

Safety protection and standardized removal prevent secondary damage. Safety arrangements: safety nets and warning lines are set up below the damaged panel, and workers at height are equipped with double-safety devices—Qinglong's safety protection complies with the GB 6095-2021 standard. Old panel removal: first cut away the sealant around the damaged panel, loosen the fixing bolts/hangers with a specialized wrench, and lift the panel away smoothly using a small lifting device (load capacity ≥1.5 times the panel weight)—Qinglong avoids prying adjacent intact panels during removal, achieving a damage rate of 0. Substrate cleaning: remove dust, rust, and old sealant residue from the substrate steel frame and embedded parts, and check substrate flatness (≤1mm/m)—Qinglong applies anti-rust primer after substrate cleaning to ensure a clean installation surface.

III. New Panel Installation and Sealing Acceptance: Precise Fixing for Quality

Installation and acceptance ensure the replacement meets standards. New panel hoisting: lift the new panel to the installation position with a specialized lifting device, and calibrate horizontal and vertical deviations with a laser positioning instrument—Qinglong's installation accuracy is ≤±2mm. Fixing and tightening: install bolts/hangers in their original positions with tightening torque ≥40N·m and ≥4 fixing points per panel—Qinglong conducts pull testing after bolt tightening (pull-out resistance ≥5kN). Sealing treatment: fill joints with foam rods (diameter 20% larger than the joint width) and apply weather-resistant silicone sealant, with the sealant joint in an arc shape (radius ≥5mm)—Qinglong's sealant is fully compatible with UHPC with no corrosion. Acceptance testing: perform a water spray test (no leakage over 30 minutes) and check surface flatness and joint alignment—Qinglong's acceptance pass rate reaches 100%. Project case: replacement of damaged panels on the UHPC curtain wall of the Shenzhen Yirui Biotechnology Building followed the above process; after replacement, the panels are visually consistent with the original curtain wall, with no anomalies over years of use.