What Are the Installation Requirements for Embedded Countersunk Bolts? Connection Technology and Qinglong Group Precision Standards

The installation requirements for embedded countersunk bolts cover three key aspects: positioning accuracy, anchoring depth, and anti-rust treatment, with error control directly affecting connection safety. In the roof project of the Hainan International Convention and Exhibition Center, Qinglong Group adopted total station setting out (error ≤±2mm), fixing with special fixtures, and torque wrench tightening (torque 20-25N·m), achieving a 100% installation pass rate for 12,000 countersunk bolts. The pull-out resistance of embedded countersunk bolts must be ≥5kN, ensuring the safety of curtain wall systems in typhoon-prone areas.

Positioning Accuracy Control

Coordinates are exported from the BIM model and set out by laser. Verticality deviation of countersunk bolts ≤1°, position error ≤3mm.

Anchoring Depth Assurance

Anchoring depth ≥15d (d is the bolt diameter), with thorough hole cleaning. Qinglong Group uses patented anchor bolts, increasing load capacity by 20%.

Anti-Rust Treatment and Acceptance

Countersunk bolts are galvanized (≥50μm) and sealed with injected sealant after installation. Pull-out tests are spot-checked at a rate of 5% to ensure safety.

High-standard installation is the cornerstone of reliable connections.