How to Achieve Demountable Connections in GRC Curtain Walls: Key Design Points and Technical Path Analysis

As the “outer garment” of modern architecture, a building curtain wall's connection system, in terms of its reliability and maintainability, directly affects the building's safety, service life, and aesthetic value. In the field of GRC (Glass Fiber Reinforced Concrete) curtain walls, detachable connection technology is becoming a key innovation direction for solving traditional curtain wall maintenance challenges. As an industry participant with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will systematically analyze the implementation solutions for detachable connections in GRC curtain walls from three dimensions: design logic, technical pathways, and engineering practice.

Core Design Logic of Detachable Connections in GRC Curtain Walls: The Balancing Art of Safety and Flexibility

Detachable connections are not a simple “bolt + nut” combination, but a design system built upon the deep coupling of material properties and structural mechanics. The lightweight, high-strength nature of GRC material (with flexural strength reaching over 20MPa) provides the foundation for lightweight design of connection systems, yet also places higher demands on the fatigue resistance of joints. During the detailed design phase, Qinglong typically employs “3D parametric modeling + finite element stress simulation” technology, focusing on solving three core problems: first, optimizing the load transfer path of connection joints to ensure force flow continuity under wind loads and seismic action; second, compensating for relative displacement between components and the main structure, achieving a displacement adjustment of ±30mm through slotted connectors; third, the ergonomic design of detachable operations, with all connection components designed for single-person operation with tools to avoid risks of working at heights.

Practice of Four Technical Pathways: From Material Selection to Construction Method Innovation

At the specific technical implementation level, Qinglong has built a detachable connection system through multi-dimensional technological innovation. In the material dimension, a combined solution of “GRC components + stainless steel hardware system” is adopted, with hardware fittings made of 316 stainless steel and treated with fluorocarbon coating to ensure durability in extreme environments such as marine climates. In the structural dimension, the innovatively developed “modular unitized connection” technology transforms the scattered connections of traditional curtain walls into standardized unitized docking; through a quick-locking mechanism between embedded connectors and the main structure, the removal time of a single GRC curtain wall panel is shortened to within 30 minutes.

The detail treatment of joint construction directly determines the reliability of detachable connections. In the Dongguan Women and Children's Activity Center project, Qinglong pioneered the “sandwich-type connection joint”: a load-bearing steel frame is set on the inner side, the middle layer is a GRC decorative layer, and the outer side is equipped with removable cover panels, which not only meets structural safety requirements but also provides operational space for later maintenance. This technology won the Silver Award of the AALBORG WHITE Cup GRC Construction Engineering Innovation Award and has become a model case of detachable connections.

Value Reconstruction of Detachable Connections from a Full Life-Cycle Perspective

The value of detachable connection technology is reflected not only in the construction phase but extends throughout the building's full life cycle. From an economic perspective, GRC curtain walls with detachable connections reduce later maintenance costs by more than 40% compared to traditional curtain walls, making them especially suitable for building types that require frequent facade updates, such as commercial complexes and airports. In terms of sustainability, detachable design raises the recycling rate of GRC components to 85%, in line with the “circular economy” development concept. In the “Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC)” (JGJ/T423-2018), which Qinglong participated in formulating, detachable connections are specifically regulated as a key technical direction, driving industry technological upgrades.

As a National High-Tech Enterprise and a participant in formulating GRC industry standards, Qinglong has always believed that detachable connection technology is a key lever in the transformation of GRC curtain walls from “construction” to “intelligent manufacturing”. In the future, with the deep integration of BIM technology and intelligent operation and maintenance systems, GRC curtain wall detachable connection systems will achieve a leap from “detachable” to “intelligently detachable”, providing more imaginative solutions for the dynamic renewal of building skins. This represents not only technological progress, but also a vivid practice of the concept of harmonious coexistence among architecture, people, and the environment.