What Is the Construction Process for Renovating Existing Building Exterior Walls with UHPC Panels? Qinglong's Standardized Process and Renovation Case Studies

Renovating existing building exterior walls with UHPC panels requires following a standardized process of "assessment - design - renovation - installation - acceptance", balancing safety, feasibility and construction efficiency while avoiding impact on the original building structure. Qinglong Group has been deeply engaged in the old building renovation field for 28 years and formulated the "Construction Specification for UHPC Exterior Wall Renovation of Existing Buildings". Through BIM technology and modular construction, it has achieved efficient implementation in renovation projects such as the American International School of Guangzhou and Sanya Festival Square, shortening construction cycles by 30% with a 100% renovation pass rate.

I. Preliminary Assessment and Preparation: Laying the Foundation for Renovation

Building structure assessment: Test the structural strength, verticality and flatness of the original wall to determine whether it meets UHPC panel installation requirements (substrate compressive strength ≥ C30). Qinglong uses rebound hammers and laser rangefinders for testing, issues structural assessment reports, and provides reinforcement solutions (such as carbon fiber sheet bonding) for areas with insufficient strength. Site survey and measurement: 3D laser scanning obtains precise data of the building facade to establish digital models; Qinglong's scanning accuracy is ≤ ±1mm, ensuring designs match actual conditions. Plan formulation: Based on assessment results, owner requirements and architectural style, formulate plans for UHPC panel selection, layout, installation and old wall treatment, clarifying construction cycles, safety measures and environmental requirements. Qinglong customizes exclusive plans for each renovation project, balancing effect and feasibility.

II. Design Deepening and Prefabricated Production: Precisely Matching Old Buildings

Design deepening: BIM modeling based on site data to optimize UHPC panel dimensions, shapes and hanging methods, avoiding original doors, windows, pipelines and other structures. Qinglong's BIM modeling can simulate the installation process and detect collision issues in advance; in the American International School of Guangzhou renovation project, BIM optimization avoided 5 pipeline conflicts. Mold customization: Molds are customized according to detailed design drawings, considering errors in old building facades with reserved adjustment space (±5mm). Qinglong's mold machining precision is ≤ ±0.5mm, ensuring UHPC panel adaptability. Prefabricated production: UHPC panels are produced with factory standardization, controlling strength (compressive ≥ 150MPa) and dimensional accuracy (deviation ≤ ±2mm), with strict inspection before delivery. UHPC panels in Qinglong's renovation projects have a 100% factory pass rate, avoiding on-site rework.

III. Old Wall Treatment and Substrate Renovation: Ensuring Installation Quality

Old finish removal: Remove the original exterior wall decorative layers (tiles, coatings, stone) and clean surface dust, oil stains and laitance to avoid affecting the connection between the substrate and UHPC panels. Qinglong uses mechanical + manual removal to reduce vibration to the wall structure. Substrate leveling and reinforcement: Level the wall surface with cement mortar (flatness deviation ≤ 5mm/2m) and reinforce loose areas (such as rebar planting and adding embedded parts). After Qinglong's substrate treatment, flatness deviation is ≤ 3mm/2m, meeting installation requirements. Waterproofing treatment: Apply waterproof coatings or lay waterproof membranes, focusing on leakage-prone areas such as door/window openings and internal/external corners. Qinglong's waterproofing grade is ≥ Grade II, ensuring no leakage after renovation.

IV. Installation Construction and Acceptance Maintenance: Efficient and Safe Implementation

Modular installation: Using the "multi-point hanging + 3D laser positioning" process, install UHPC panels in layout order and adjust flatness and verticality (deviation ≤ ±2mm). Qinglong's installation efficiency reaches 3-4㎡/person·day, 2 times higher than traditional renovation. Sealing and finishing: Panel joints are filled with neutral silicone sealant (movement capability ±25%), with special finishing treatment at nodes such as door/window openings and internal/external corners. Qinglong's sealant application uses caulking guns for uniform filling without bubbles or voids. Acceptance and cleaning: Conduct acceptance inspection of appearance, dimensions, strength and waterproofing per industry standards, and clean exterior wall surfaces after passing acceptance. Qinglong's renovation projects have a 100% first-pass acceptance rate. After-sales maintenance: Provide a 10-year warranty with regular inspections (once a year) to promptly address potential issues. In Qinglong's American International School of Guangzhou renovation project, there were no quality issues in the 5 years after completion.

V. Qinglong Renovation Project Evidence and Advantages

American International School of Guangzhou auditorium renovation: Removed the old exterior walls and adopted modern geometric UHPC panels. The construction cycle was 2 months, 1 month shorter than traditional renovation, and the building's appearance was completely transformed, becoming an iconic work. Sanya Festival Square renovation: 70000㎡ GRC/UHPC exterior wall renovation using sandstone-imitation colored UHPC panels to restore the original style. The construction cycle was 6 months with no safety accidents, earning high recognition from the owner. Technical advantages: 3D laser scanning, BIM modeling and modular construction solve problems such as large errors in old building facades and limited construction space; the professional team's rich experience enables it to handle complex renovation scenarios.

The construction process for renovating existing building exterior walls with UHPC panels requires standardization and refinement. With full-process services covering preliminary assessment, design deepening, precise production and professional installation, Qinglong Group provides efficient, safe and high-quality solutions for old building renovation. Choosing a manufacturer with renovation experience and technical strength is the key to successful old building exterior wall renovation.