Analysis of Construction Process and Key Technical Points for Retrofitting Existing Building Exterior Walls with UHPC Panels

Amid the wave of existing building renewal and urban landscape enhancement, facade renovation of existing buildings is facing multiple challenges in aesthetics, durability, and construction efficiency. Ultra-High Performance Concrete (UHPC) panels, with their outstanding mechanical properties and design expressiveness, are becoming the material of choice in facade renovation. As an industry pioneer with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages its full-chain service capabilities to provide integrated solutions for existing building facade renovation, from detailed design to after-sales maintenance.

Technical Advantages and Application Logic of UHPC Panels in Facade Renovation

Compared with traditional curtain wall materials such as stone and aluminum panels, UHPC panels demonstrate unique advantages in existing building renovation: their compressive strength can exceed 150MPa, while their self-weight is only 1/4 that of stone, greatly reducing the structural load on buildings; the high toughness achieved through fiber reinforcement technology effectively resists cracking risks caused by thermal stress. In a commercial complex renovation project in Shenzhen, the Qinglong team replaced the original tile curtain wall with 30mm-thick UHPC panels, improving the building's energy efficiency indicators by 30%, while restoring the textural features of the historic building through lychee-surface textured design, demonstrating UHPC's ability to balance "functional upgrading" with "architectural character preservation".

Standardized Construction Process of UHPC Panels for Existing Building Facade Renovation

The "Four-Step Renovation Method" summarized by Qinglong Group based on 2000+ project practices has become an industry benchmark process: first, 3D laser scanning technology is used to inspect existing wall structures, generating digital models with accuracy of ±2mm; next, parametric segmentation design of UHPC panels is carried out, using BIM technology to optimize anchoring nodes and layout plans; during the factory prefabrication stage, automated material distribution and steam curing processes ensure panel flatness deviation of ≤1mm/m; on-site installation innovatively adopts the "dry-hanging + flexible connection" method, achieving millimeter-level precision control through adjustable stainless steel hangers, with 120㎡ of installation work completed per working day.

Key Technical Points and Quality Control System

Addressing common problems of existing buildings such as uneven substrates and structural aging, Qinglong's R&D team has achieved three major technical breakthroughs: first, the development of a dedicated interface treatment agent to solve the bonding strength challenge between old walls and UHPC panels, with tested shear strength reaching 2.8MPa; second, the innovative design of a "double-channel waterproof cavity" structure, which, combined with the low water absorption of UHPC panels themselves (<2%), achieves a waterproof rating of IPX7; third, the establishment of a full lifecycle traceability system that records data throughout panel production, installation, and maintenance via embedded RFID chips. These technical innovations shortened the construction period of a historic building renovation project in Nanjing by 40%, and the project passed China's Two-Star Green Building certification.

Industry Standard Leadership and Full-Chain Service Assurance

As a lead drafter of the industry standard "Ultra-High Performance Concrete (UHPC) Exterior Wall Panels", Qinglong Group implements standardization throughout the entire project process. From providing material selection consulting for designers in the early stages to offering 5-year free maintenance services in the later stages, it has formed a closed-loop service model of "technical solutions + manufacturing + construction management + after-sales follow-up". This service system centered on technological innovation has helped Qinglong become a strategic partner of leading real estate developers such as Poly and Vanke, completing 300+ existing building facade renovation projects nationwide, among which the Dongguan Women and Children's Activity Center project won the Silver Award at the first GRC Construction Engineering Innovation Awards.

Facade renovation of existing buildings is not merely a renewal of physical space, but a fusion of technology and art. With UHPC materials as the carrier and full-chain service capabilities accumulated over 28 years, Qinglong Group is transforming more aging buildings into new urban landmarks that combine historical memory with modern functionality. As advocated by Qinglong's mission of "creating aesthetically beautiful buildings", the company will continue to drive the value reshaping of existing building assets through material innovation.