What Are the Installation Requirements for Embedded Countersunk Bolts? Qinglong GRC Embedded System Precision Installation Technology

The installation precision of pre-embedded sinking bolts directly affects the safety and reliability of GRC component connections. Through 28 years of engineering practice, Qinglong GRC has developed installation technical standards for pre-embedded sinking bolts centered on positioning precision, with anti-rust treatment as the key and load-bearing capacity verification as the safeguard.

In the curtain wall project of Ping An Finance Center in Shenzhen, faced with the installation task of over 20,000 pre-embedded sinking bolts, Qinglong adopted a total station positioning system (precision ±1mm), dedicated fixing fixtures, and laser calibration technology, keeping bolt position deviation within ±2mm and verticality deviation ≤1/300. Pull-out tests verified that a single M12 sinking bolt achieved a pull-out resistance of 25kN, 2.5 times the design value.

Positioning Precision Control Standards

Planar position deviation ≤2mm; elevation deviation ≤1.5mm; verticality deviation ≤1/300. Total station setting-out and dedicated positioning molds are used for fixing to ensure batch installation precision.

Anti-Rust Treatment Process Requirements

Use Dacromet treatment (thickness ≥8μm) or hot-dip galvanizing (thickness ≥55μm); apply epoxy zinc-rich primer to threaded parts after installation; install insulating gaskets to prevent electrochemical corrosion. These measures ensure 50 years of rust-free performance.

Key Points of Installation Depth Control

The embedment depth of sinking bolts shall be ≥10 times the bolt diameter; the top cover thickness ≥15mm; depth control rings shall be used to ensure consistency. Depth deviation is controlled within ±0.5mm.

Load-Bearing Capacity Verification Methods

1 out of every 100 bolts is sampled for pull-out testing; the failure load must be ≥2 times the design value; if the failure rate exceeds 1%, the entire batch is inspected. Complete inspection record archives are established.

Pre-embedded sinking bolt installation requires meticulous work. Qinglong GRC's pre-embedded system installation precision reaches an industry-leading level, providing reliable assurance for curtain wall safety.