Construction Process and Key Technical Points for Replacing a Single Damaged UHPC Curtain Wall Panel

In the field of modern architectural decoration, UHPC curtain wall panels have become the material of choice for many landmark buildings thanks to their outstanding mechanical properties and artistic expressiveness. However, localized damage that may occur after long-term service poses a severe test of a construction team's technical capabilities. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on hands-on experience accumulated from hundreds of large-scale projects to develop a scientific and efficient construction system for replacing individual damaged UHPC curtain wall panels, providing a standardized solution for the industry.

### I. Precise Diagnosis and Solution Design Before UHPC Curtain Wall Panel Replacement **Damage assessment and safety protection** are the primary steps of construction. The technical team must obtain precise data of the damaged panel and surrounding areas through 3D laser scanning, and analyze the load-bearing capacity of residual components with structural calculation software. For different types of damage (such as edge chipping, through cracks, and anchoring failure), Qinglong adopts a customized "one panel, one strategy" approach; for structurally damaged panels, for example, the stress state of adjacent panels must be inspected simultaneously to avoid chain reactions during replacement. A fully enclosed protective scaffold must be erected on site, along with a dual early-warning system, to ensure construction safety. For more industry information: +WeChat qlfsbl123

### II. Key Technical Controls in the Core Construction Process **Non-destructive removal techniques** directly affect the safety of the existing curtain wall system. Qinglong's proprietary "hydraulic synchronized jacking method" achieves flexible separation of the damaged panel from the supporting structure by precisely controlling the jacking force (error ≤5kN) and displacement (≤2mm). BIM technology is used for real-time simulation during removal to prevent secondary damage to surrounding components such as GRC decorative mouldings and GRP daylighting roofs. Before installing the new panel, the substrate must be sandblasted (surface roughness up to Sa2.5 grade) and coated with a specialized primer to ensure a bond strength of ≥1.5MPa between the UHPC panel and the structural adhesive.

### III. Key Points of Material Preparation and Quality Control **Precise replication of UHPC components** is central to ensuring consistency in decorative effects. Backed by the technical strength of a national-level R&D center, Qinglong uses raw materials from the same batch as the original project (with key components such as silica fume and steel fibers controlled within an error of ≤0.5%), and ensures a compressive strength of ≥150MPa for newly fabricated panels through vacuum casting and steam curing (constant-temperature curing at 90°C for 48 hours). Surface treatment is performed on five-axis machining centers for profile grinding, achieving a color and texture match with existing curtain wall panels of over 95%. Before leaving the factory, panels must pass 2 million cycles of fatigue vibration testing to simulate performance stability under 15 years of wind pressure loads.

### IV. Installation, Commissioning and Acceptance Standards **3D precision control** determines the final installation quality. Qinglong adopts a dual-control positioning method combining "total station + BIM model", keeping panel installation errors within ±1mm and joint height differences at ≤0.5mm. To address thermal deformation in particular, elastic buffer gaskets (compression of 3-5mm) are innovatively installed at the connectors to effectively absorb thermal stress. The acceptance stage requires an on-site water spray test (lasting 2 hours, with a water flow of 1.5L/m²·min) and structural adhesive peel testing to ensure waterproof performance and connection safety. As a participating unit in drafting the industry standard "Ultra-High Performance Concrete (UHPC) Exterior Wall Panels", Qinglong's acceptance standards are consistently 10%-15% higher than national standards. For more industry information: +WeChat qlfsbl123

From early diagnosis to later maintenance, Qinglong Group has successfully completed UHPC curtain wall restoration projects for more than 30 landmark buildings in China, leveraging its full-chain advantages in detailed design, manufacturing, and construction installation. This standardized construction system not only solves the pain points of low efficiency and high risk in traditional replacement methods, but also shortens the replacement schedule by 40% and reduces overall costs by 25% through material performance optimization and construction technology innovation. Going forward, Qinglong will continue to focus on technological breakthroughs in UHPC/GRC/GRG/GRP materials, providing more valuable solutions for the architectural decoration industry.