Construction Process Analysis and Key Technical Points for Retrofitting Existing Building Facades with UHPC Panels

Renovating the exterior walls of existing buildings is an important undertaking for enhancing urban appearance and building performance. With their ultra-high strength, excellent durability, and design flexibility, UHPC panels are becoming the material of choice in this field. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group provides professional solutions for designers and owners from two dimensions: construction process analysis and key technical control.

I. Complete Construction Process Analysis of UHPC Panel Exterior Wall Renovation

Using UHPC panels for exterior wall renovation of existing buildings requires a scientific and rigorous construction logic to ensure project quality and efficiency. First, in the preliminary assessment phase, the original building structure must be comprehensively inspected, including wall substrate strength, flatness, and load-bearing capacity, which forms the foundation for the safe installation of UHPC panels. Subsequently, based on the architectural style and functional requirements, detailed design of the UHPC panels is carried out, using BIM technology to achieve parametric modeling of components and ensure precise matching with the overall architectural form.

In the manufacturing stage, Qinglong relies on its modern production base with an annual capacity of 600,000 square meters, using automated production lines to achieve precise prefabrication of UHPC panels, with a strict quality control system guaranteeing product strength (flexural strength can reach over 20MPa) and durability. During on-site construction, substrate treatment and embedded parts installation are performed first, followed by modular hoisting technology for rapid assembly of UHPC panels, and finally sealing treatment and surface protection are applied to form a complete exterior wall system.

II. Key Technical Control Points in UHPC Panel Construction

1. Substrate Treatment Technology: Walls of old buildings are prone to weathering, hollowing, and other issues, so high-pressure water jets are used to clean surface stains and loose substrates must be reinforced. For areas with flatness deviations exceeding 5mm, special leveling mortar is used for repair to ensure the precision of UHPC panel installation surfaces.

2. Connection Joint Design: A flexible connection system is adopted, using stainless steel connectors to achieve elastic fixing of UHPC panels to the substrate, effectively releasing thermal stress and preventing panel cracking. In projects such as the Century Plaza renovation on Nanjing East Road, Qinglong successfully solved the installation challenges of large-span irregular components using this technology.

3. Waterproofing and Sealing Process: Weather-resistant silicone sealant is applied at panel joints, combined with backer foam rods to form multiple waterproof barriers. Meanwhile, drainage channels are set on the inner side of UHPC panels to ensure rapid rainwater drainage. This process has withstood the severe test of tropical climates in overseas projects in Malaysia.

III. Qinglong's Full-Chain Services Empowering Exterior Wall Renovation Projects

As a national high-tech enterprise and a standard-setting unit for the UHPC/GRC industry, Qinglong provides full-chain services from detailed design and manufacturing to construction installation and after-sales maintenance. In the detailed design phase, parametric design tools such as Rhino and Grasshopper are used to meet complex modeling requirements; the manufacturing process adopts automated material distribution and steam curing technology to ensure product quality stability; and the construction team holds a Grade II professional contracting qualification for building curtain wall engineering, enabling "zero-error" installation.

From commercial complexes to historical building renovations, UHPC panels are reshaping building envelopes with their unique advantages. Qinglong Group will continue to uphold its mission of "Creating Beautiful Architecture" and, leveraging 28 years of industry experience and technical expertise, provide safe, durable, and aesthetically pleasing UHPC solutions for exterior wall renovation of existing buildings, contributing to urban renewal and sustainable building development.