What to Consider When Combining UHPC Curtain Walls with Glass Curtain Walls: Key Points for Coordinated Design and Construction

The combined application of UHPC curtain walls and glass curtain walls can balance aesthetics and functionality, but the two materials differ greatly in their characteristics, requiring attention to coordinated design and construction to avoid problems such as improper connection and uneven load distribution. Drawing on experience from multiple combined curtain wall projects, Qinglong analyzes the key considerations to ensure optimal combined application results.

1. Coordinated Design: Balancing Performance and Aesthetic Unity

The design phase requires overall planning to achieve seamless integration of the two. First, clarify functional zoning by reasonably dividing the scope of UHPC and glass curtain walls according to building needs: UHPC is mostly used in areas with complex shapes and high load-bearing requirements (such as corners and decorative lines), while glass curtain walls focus on daylighting and transparent areas. In the Shenzhen Yirui Biotechnology Building project, Qinglong achieved a balance of function and aesthetics through this zoning. Unify mechanical design standards by incorporating calculations of wind loads, seismic action, etc., to ensure consistent load-bearing capacity at the connection nodes of both: UHPC curtain wall hanger spacing ≤1.2m, and glass curtain wall connectors must match the corresponding load-bearing capacity. Optimize joint node design by adopting flexible connection methods and reserving thermal deformation gaps (≥10mm) to prevent node cracking caused by differences in thermal expansion and contraction coefficients.

2. Material Matching: Ensuring Overall Performance Coordination

Material selection requires attention to compatibility to avoid performance conflicts. Select high-quality UHPC panels with compressive strength ≥120MPa and surface flatness tolerance ≤2mm/m; use Low-E insulated glass with thermal insulation and energy-saving performance; the thermal performance of the two must be matched to prevent condensation. Sealing materials must be compatible with both materials: choose neutral silicone weather-resistant sealant with good adhesion to both UHPC and glass, with sealant joint width ≥12mm and thickness ≥6mm to ensure effective sealing and waterproofing. Choose stainless steel connectors (304 or 316) to avoid electrochemical corrosion while meeting the connection strength requirements of both. In the Shanghai New World Century Plaza project, Qinglong achieved coordinated performance of the combined curtain wall through precise material matching.

3. Construction Connection: Ensuring Precise and Efficient Installation

The construction phase requires attention to sequence and precision to avoid connection deviations. Arrange the construction sequence reasonably: install the UHPC curtain wall load-bearing structure first, and install the glass curtain wall only after it is firmly fixed, ensuring a stable load-bearing system. Control installation precision: levelness and verticality errors at the connection areas of the two must be ≤1mm, with straight and even panel joints; Qinglong adopts 3D laser positioning technology to improve combined installation precision. Carry out proper sealing and waterproofing: adopt a "double sealing + drainage channel" design at connection areas—the first sealant layer ensures watertightness, and the second incorporates a drainage channel to promptly discharge infiltrated rainwater, avoiding leakage risks. In the Guangzhou Dongzhu Shangdu Commercial City project, this waterproofing design effectively solved the leakage problem at the connection areas of the combined curtain wall.

4. Operation and Maintenance Management: Ensuring Long-Term Stable Operation

Establish targeted operation and maintenance mechanisms to extend the service life of the combined curtain wall. Regularly inspect the condition of the two curtain walls separately: for UHPC curtain walls, focus on checking surface damage and connector corrosion; for glass curtain walls, pay attention to glass panel spontaneous breakage and sealant aging. Perform differentiated maintenance: clean and protect UHPC curtain wall surfaces every 3-5 years, and inspect the glass sealing performance of glass curtain walls annually, addressing any problems promptly. Increase special inspections after extreme weather, focusing on displacement and damage at connection areas. In the Yangshengtang Pharmaceutical Hangzhou Industrial Park project, Qinglong ensured the long-term stable operation of the combined curtain wall through systematic operation and maintenance, with no quality hazards.