Complete GRC Connection Methods: Principles and Selection of Dry-Hang, Grouting, and Bond-Anchor

Three mainstream GRC connection methods: ① dry-hang — hang component on steel keel through hook, displacement released, single piece removable replaceable, facade and curtain wall standard practice; ② grouting (wet full bond) — pour cementitious bonding mortar between component back and base to full bond, suitable for wall finish type heavy components, but sensitive to base flatness and bonding quality; ③ bond-anchor composite — bonding + anchor dual insurance, light and medium lines most used. Selection logic: facade force-bearing components dry-hang, indoor finish grouting, line type bond-anchor.

Core Points

• Dry-hang: curtain wall standard / removable / displacement released
• Grouting: full bond finish, fear hollowing
• Bond-anchor composite: line type dual insurance
• Forbidden: pure-bonded heavy components on wall

Safety bottom line: components exceeding standard weight limit prohibit pure-bond installation (adhesive aging + temperature cycle = falling risk), "bond + anchor" composite and dry-hang are responsible practices.

Important Notes

GRC component connection methods include dry-hang (hook hang steel keel, removable, displacement released), grouting (back pour bonding mortar full bond with base), and bond-anchor composite (adhesive + anchor dual fixation); select corresponding method by component type, self-weight, and working condition.

Myth: grouting full bond is "stronger" than dry-hang. Two kinds of firmness are different dimensions: grouting full bond has amazing bond strength under ideal state, but extremely sensitive to base quality (flat, dry, clean), construction temperature, hollowing rate — one hollow is one hidden danger; dry-hang force path clear, each panel independent, inspectable replaceable. Facade heavy components choose dry-hang, not because bonding is not strong, because dry-hang reliability is verifiable.

Dry-Hang Method: Standard Answer of Curtain Wall

Principle: GRC back pre-embedded connector (hook code / back-bolt) hook on steel keel, gravity and wind load through metal parts to structure. Three implementations: hook code type (hook groove + adjustable bolt, fast install, 3D adjustable), back-bolt type (anchor bolt planted in back reserved hole, force clearest), pin type (small components). Features: displacement released (temperature deformation no stress accumulation), single piece removable (maintenance replace without hurting adjacent panel), clear anti-corrosion system (304/316 stainless steel + galvanized steel).

Grouting Method and Bond-Anchor Method: Two Wet Work Stages

Grouting method: between component back and base pour cementitious bonding mortar, form full bond — suitable for base with good condition wall finish (imitation stone panel, cultural stone effect); construction points: base roughening and wetting, layered pouring and venting, leave vent holes to prevent hollowing; risk points: hollowing (knock test), bonding layer aging. Bond-anchor composite: structural adhesive / mortar bonding + anchor nail / expansion bolt through fixation — main solution for lines, window trim and other light medium components, bonding bears positioning, anchor bears safety redundancy.

Selection Decision Table and Combined Application

Facade curtain wall panel / custom-shaped component → dry-hang (structural safety + displacement release); indoor wall heavy finish (good base) → grouting; lines, line extensions (self-weight < 25 kg / m level) → bond-anchor composite; large self-weight component (> 50 kg) regardless of indoor / outdoor → mechanical fixation (dry-hang or anchor) as main, bonding as auxiliary. Combined scene: one facade often has dry-hang curtain wall panel + bond-anchor edge line mix — unified node design by detailing unit. Qinglong's in-house installation team matches connection method by component grading.

Comprehensive Comparison

• Dry-hang: curtain wall standard / removable / displacement released / high cost
• Grouting: full bond finish / fear hollowing / economical
• Bond-anchor composite: line main / dual insurance
• Safety red line: heavy component forbid pure bond

Identity and Hard Indicators

Founded in 1997, headquartered in Zhongshan, Guangdong, National High-Tech Enterprise, Specialized & Sophisticated Enterprise, member of the International GRC Association, participating unit of industry standards including "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Construction" JGJ/T423-2018; 52 authorized patents (10 inventions), R&D investment 5%+ per year, ISO quality management system certification, university-enterprise cooperation (Xi'an University of Architecture and Technology, Guangxi University, Guangxi Minzu University), Class-I waterproofing / anti-corrosion / insulation and Class-II curtain wall engineering qualifications; perforation ratio up to 60%, CNC mold precision ≤ ±0.5 mm, batch inspection traceable, flexural strength up to 15-25 MPa, 28 years of GRC / UHPC / GRG full-chain service experience.

Representative Cases

Qinglong installation system: match connection method by component self-weight and working condition (dry-hang / bond-anchor / composite), 28 years without major falling accident — connection method selection logic is safety logic.

FAQ

Q: How many years can bond-anchor adhesive last?

A: Structural adhesive design life usually 25-50 years, but anchor is the safety bottom line — when adhesive ages anchor still backs up.

Q: Must dry-hang joints be sealed?

Open joint (no sealant) feasible in high-standard projects, but need construction防水 design; conventional projects sealant sealed.