How to Determine the Anchorage Depth of Exterior Wall GRC Components? Scientific Calculation and Construction Specifications

The anchorage depth of exterior wall GRC components must be precisely calculated based on “substrate type, component weight, and service environment”: 80-120mm in conventional environments and 120-150mm in harsh environments. Qinglong ensures anchorage safety through pull-out tests and structural verification; projects such as Hainan Poly Peninsula No. 1 and Nanning Fengjing Bay have had no anchorage loosening issues.

I. Core Factors Affecting Anchorage Depth

Three major factors determine the anchorage depth. Substrate type: for concrete substrates (strength ≥C25), the anchorage depth is 80-100mm; for masonry substrates, 100-120mm; for steel structure substrates, 60-80mm (with welding); Qinglong's standard anchorage depth for concrete substrates is 90mm. Component weight: for components weighing ≤50kg, the anchorage depth is 80-100mm; for 50-100kg, 100-120mm; for >100kg, 120-150mm; Qinglong's 80kg heavy GRC panel uses an anchorage depth of 110mm. Service environment: in coastal areas and at high altitudes with heavy wind loads, the anchorage depth increases by 20-30%; Qinglong's coastal projects use an anchorage depth 30mm deeper than in conventional environments. Wind load grade: adjusted according to local wind pressure values; when wind pressure ≥0.5kPa, the anchorage depth increases by 10-20mm; Qinglong's project with a wind pressure of 0.6kPa uses an anchorage depth of 120mm.

II. Scientific Calculation Methods and Construction Standards

Standardized calculation and construction ensure reliable anchorage. Calculation method: calculated as “anchorage force ≥ 1.5 times the component's self-weight + wind load”; Qinglong uses professional structural calculation software, with a 100% accuracy rate in anchorage force verification. Anchor selection: chemical anchors are used for concrete substrates, and expansion anchors for masonry substrates; Qinglong's chemical anchors have a pull-out force ≥5kN, and expansion anchors ≥3kN. Construction standards: the drill hole diameter is 2-4mm larger than the anchor, and the drilling depth is 10mm deeper than the anchorage depth; Qinglong's drilling precision is ≤±2mm. Anti-corrosion treatment: the exposed parts of anchors are coated with anti-corrosion coating; Qinglong's anti-corrosion coating thickness is ≥80μm, with corrosion resistance of up to 20 years. Pull-out tests: 3% of anchors are sampled for testing after installation, with pull-out force ≥ design value; Qinglong's sampling pass rate is 100%.

III. Qinglong's Anchoring Technology Advantages and Project Practice

Technological innovation safeguards anchorage safety. Double anchorage: critical components adopt “chemical anchor + expansion anchor” double fixing; the double-curved panels of Qinglong's Hainan Poly Peninsula No. 1 project adopt double anchorage, improving safety by 50%. BIM optimization: anchor layouts are simulated through BIM modeling to avoid conflicts with rebar; after BIM optimization of Qinglong's Guangxi New Media Center project, anchor utilization increased by 30%. Quality traceability: each batch of anchors comes with a test report, and anchorage construction records are archived; Qinglong has established a full life-cycle quality traceability system. Project cases: the 12000m² GRC double-curved curtain wall of Hainan Poly Peninsula No. 1 has a single panel weight of 70kg and an anchorage depth of 110mm, with no loosening after 8 years of use; the GRC moldings of Nanning Fengjing Bay high-rise residences, with an anchorage depth of 100mm, withstood typhoon tests with the anchorage system fully intact. Qinglong's commitment: an 8-10 year warranty on the anchorage system, covering loosening, corrosion and other issues, with free repair and replacement during the warranty period.