How to Determine the Anchorage Depth of Exterior GRC Components?

The anchoring depth of exterior wall GRC components is a critical factor in ensuring the safety and durability of building facades, directly affecting the stability of components under long-term loads, temperature changes, and natural environmental conditions. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide designers, owners, and contractors with scientific solutions for determining anchoring depth from three dimensions—technical specifications, material properties, and construction practices—helping projects achieve a dual guarantee of safety and aesthetics.

### I. Based on Technical Specifications: Establishing the Baseline for Anchoring Depth

The primary basis for determining the anchoring depth of exterior wall GRC components is current industry standards. According to the Technical Standard for Building Applications of Glass Fibre Reinforced Cement (GRC) (JGJ/T423-2018), the anchoring depth must satisfy the combined effects of component dead weight, wind loads, and seismic action, while also considering the load-bearing capacity of the substrate (such as concrete walls or steel structures). For example, when the GRC component thickness is 80-120mm and expansion bolt anchoring is used, the anchoring depth in a concrete substrate should be no less than 80mm, while for steel structure substrates it must be determined through pull-out tests to ensure that each bolt's tensile capacity is no less than 5kN. As a participating developer of this standard, Qinglong Group always follows the specifications as its guiding principle, optimizing anchoring solutions with practical data from over 2,000 projects to provide customers with compliant and cost-effective technical support.

### II. Considering Material Properties: Dynamically Adjusting Anchoring Parameters

The dead weight, strength, and installation method of GRC components are the core factors affecting anchoring depth. Qinglong GRC products are made from high-purity alkali-resistant glass fibres combined with low-alkali cement, achieving a flexural strength of over 20MPa and a density only 1/4 that of traditional stone, which allows the anchoring system to optimize depth while ensuring safety. Taking common exterior wall decorative lines as an example, when the component length is ≤1.5m and the weight is ≤50kg, M12 expansion bolts with a spacing of 500-800mm can be used at an anchoring depth of 60-80mm; for shaped double-curved panels (such as opera house facades), BIM technology is required to simulate force distribution, using chemical anchors combined with steel structure adapters, with the anchoring depth increased by 20%-30% based on calculation results. In addition, Qinglong's exclusive "fibre mesh reinforcement process" enhances the crack resistance of components, indirectly reducing the load on the anchoring system and achieving a balance between depth and performance.

### III. Emphasizing Construction Practice: Full-Process Control of Anchoring Quality

Determining the anchoring depth must be implemented at the construction stage. Qinglong Group ensures precision through its full-chain service of "detailed design - prefabrication - on-site inspection." During the detailed design stage, the technical team uses Rhino parametric software for modeling to analyze wind load coefficients at different heights (e.g., below 10m, 10-50m, and above 50m) and adjust anchoring solutions accordingly; the production stage uses CNC-engraved moulds to ensure an embedded part position deviation of ≤2mm; before on-site construction, a drilling detector is used to measure substrate strength. If porous bricks or lightweight walls are encountered, the composite anchoring process of "rebar planting + concrete reinforcement" is immediately activated to extend the depth to the main load-bearing structural layer. Taking a commercial complex project as an example, Qinglong used 3D laser scanning positioning to control the anchoring depth error of GRC curtain wall panels within ±3mm, achieving the quality goal of "zero leakage, zero detachment." For more industry information: +WeChat qlfsbl123

### IV. Long-Term Maintenance Perspective: Reserving Safety Redundancy

The full life-cycle safety of buildings requires anchoring depth to take durability factors into account. Qinglong Group recommends reserving a 15%-20% safety redundancy at the design stage. For example, in northern regions with large temperature differences, additional stress may be generated by the thermal expansion and contraction of GRC components, so the anchoring depth should be increased by more than 10mm over the calculated value; in high-humidity coastal environments, stainless steel anchors should be selected, combined with chemical anchoring at a depth of ≥100mm to resist chloride ion corrosion. In addition, Qinglong's after-sales maintenance service includes regular anchor tension testing (every 5 years), tracing anchor point status through RFID chips to ensure structural safety for more than 20 years.

Determining the anchoring depth of exterior wall GRC components is a comprehensive embodiment of technology, materials, and experience. With the technical resources of its national-level R&D center, a manufacturing capacity of 600,000㎡ per year, and a service network covering the whole country, Qinglong Group can provide integrated solutions for various projects, from parameter calculation to on-site implementation. Whether for European classical lines or modern shaped curtain walls, we always maintain a "meticulous and excellence-pursuing" attitude, integrating safety details into every anchoring design and helping customers fulfill the mission of "creating beautiful architecture." For more industry information: +WeChat qlfsbl123