Connection Methods Between UHPC Decorative Components and the Main Structure: Types and Application Analysis

In the field of contemporary architectural decoration, UHPC decorative components, with their outstanding mechanical properties and artistic expressiveness, are becoming key elements in shaping architectural aesthetics. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group profoundly understands the decisive role that connection joints play in component safety and durability. This article provides a systematic analysis of the mainstream connection methods between UHPC decorative components and the main structure and their engineering applications, offering designers and owners a full-chain technical reference.

**I. The Core Value of UHPC Decorative Component Connection Technology**

UHPC (Ultra-High Performance Concrete), with material properties including compressive strength exceeding 150MPa and elastic modulus reaching 40GPa, demonstrates unique advantages in scenarios such as building skins and irregular components. As the "lifeline" between components and the main structure, the connection system must simultaneously meet requirements for load transfer, deformation coordination, and long-term stability. Through 28 years of engineering practice, Qinglong Group has found that scientific connection design can extend the service life of UHPC components to more than 50 years and reduce maintenance costs by 30% compared with traditional connection methods.

**II. Technical Analysis of Four Mainstream Connection Methods**

1. **Mechanical Anchoring Connection System**
As the most widely used connection form, mechanical anchoring achieves rigid fixing through stainless steel bolts and embedded parts, suitable for high-load scenarios such as curtain wall panels and shading systems. In the Nanning ASEAN Cultural Plaza project, Qinglong innovatively adopted a combined solution of "stainless steel back bolts + aluminum alloy hangers," controlling the installation error of a single UHPC component (weighing up to 80kg) within ±2mm, successfully solving the wind load challenge for large-sized components. This technology is particularly suitable for load-bearing components such as GRC decorative lines and UHPC exterior wall panels, and withstood a Category 12 typhoon in the commercial complex attached to the Canton Tower.

2. **Grout Sleeve Connection Technology**
To meet prefabricated assembly requirements, the UHPC-specific grout sleeve connection system developed by Qinglong achieves mechanical interlocking between rebar and components through high-strength non-shrink grout. In the Shenzhen Qianhai Financial Center project, this technology increased on-site installation efficiency by 40% while meeting the seismic fortification intensity of 8 degrees. Compared with traditional welding processes, grout connection can reduce on-site work by 60%, making it particularly suitable for indoor and outdoor scenarios requiring rapid installation, such as GRG ceilings and GRP daylighting roofs.

3. **Flexible Connection Damping System**
In earthquake-prone regions, Qinglong's UHPC flexible connection system combines elastic gaskets with sliding supports, allowing components to undergo horizontal displacement of ±30mm. After the Yunnan Dali Culture and Art Center project adopted this technology, third-party testing showed that its damping effect reached 85%, perfectly meeting the deformation coordination requirements between GRC relief walls and the main structure. This system has been successfully applied in landmark projects in more than 10 high-seismic-intensity cities nationwide.

4. **Embedded Connection Innovative Solution**
For complex curved shapes, Qinglong's original UHPC embedded connection technology achieves precise positioning of double-curved components through the organic combination of pre-embedded rebar in components and reserved slots in the main structure. After the UHPC irregular ribbons (maximum curvature radius of 3.5 meters) at the Shanghai Bund Financial Center adopted this technology, installation precision reached 0.5mm/m, and its process complexity received high praise from the Technical Committee of the International GRC Association.

**III. Engineering Adaptation Strategies for Connection Technology**

Based on 28 years of full-chain experience, Qinglong Group has established a scientific selection system for connection methods: public building exterior walls prioritize a combined solution of mechanical anchoring and flexible connection; underground projects such as subways and utility tunnels are recommended to use grout sleeve connection; GRG ceilings in cultural venues are suited to embedded connection; while overseas high-temperature and high-humidity environments (such as projects in Malaysia and Saudi Arabia) require specially configured corrosion-resistant stainless steel connectors. This customized approach has enabled the more than 600 UHPC/GRC projects undertaken by Qinglong to achieve a zero safety accident record.

**IV. Industry Development Trends and Qinglong's Practice**

With the popularization of BIM technology and parametric design, UHPC connection systems are developing toward digitalization and modularization. As a participating drafting unit of the industry standard "General Technical Conditions for Non-Load-Bearing UHPC Components," Qinglong has integrated BIM models with a connection joint library, achieving full-process digital management and control from design to construction. In the Nanjing East Road Century Plaza translucent concrete project, digital twin technology was used to simulate the stress state of connection joints, increasing installation efficiency by 50%, and the project won the AALBORG WHITE Cup UHPC Construction Engineering Innovation Award.

As a national "specialized, refined, distinctive, and innovative" enterprise, Qinglong Group has always upheld the mission of "creating beautiful architecture," transforming 28 years of connection technology experience into standardized solutions. From joint verification calculations in the detailed design stage, to precision control of connector embedding in production (error ≤1mm), to 3D scanning positioning during on-site installation, a quality assurance system covering the entire life cycle has been formed. In the future, Qinglong will continue to drive innovative breakthroughs in UHPC connection technology, providing the architectural decoration industry with system solutions that are safer, more durable, and of greater aesthetic value.