What Are the Installation Requirements for Embedded Anchor Bolts? Detailed Installation Specifications and Technical Key Points

As a key load-bearing component in the installation of new decorative building materials such as UHPC/GRC/GRG/GRP, the construction quality of pre-embedded anchor bolts directly affects the structural safety and durability of curtain wall systems. Qinglong Group, with 28 years of industry experience, has always regarded the standardized installation of pre-embedded anchor bolts as a core element of engineering quality control in its full-chain services ranging from detailed design and manufacturing to construction and installation. Drawing on industry standards such as the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018), this article explains the key installation techniques for pre-embedded anchor bolts from three dimensions: material selection, construction technology, and quality acceptance.

### I. Material Selection for Pre-Embedded Anchor Bolts: Mechanical Design Matching UHPC/GRC Material Properties

Materials such as UHPC/GRC/GRG/GRP, with their lightweight, high-strength and flexible shaping properties, impose special requirements on the load-bearing capacity of pre-embedded anchor bolts. At the material selection stage, Qinglong strictly follows the “load matching” principle: for UHPC exterior wall panels (flexural strength ≥20MPa), high-strength bolts of grade 8.8 or above are selected to ensure a tensile load-bearing capacity of no less than 15kN; for GRC decorative components, M12-M16 anchor bolts are matched according to thickness (usually 8-15mm), together with hot-dip galvanized surface treatment (zinc layer thickness ≥85μm) to meet the 5000-hour corrosion resistance requirement in salt spray environments. It is worth noting that GRG indoor ceiling systems require additional consideration of fire performance, so anchor bolts should be galvanized steel components with a fire resistance limit of ≥1.5 hours—a standard that has been verified in practice in several theater projects undertaken by Qinglong. For more industry information: +WeChat qlfsbl123

### II. Construction Technology Standards: Full-Process Control from Positioning and Layout to Anchoring and Grouting

During construction and installation, Qinglong adopts a precision positioning solution combining BIM technology with 3D laser scanning, achieving an anchor bolt installation error of ≤3mm. The specific process includes: 1) structural surface pretreatment, with sandblasting and rust removal to the Sa2.5 standard to ensure a base layer friction coefficient of ≥0.6; 2) formwork fixing, using adjustable steel supports (load capacity ≥500kg) to keep the anchor bolt verticality deviation below 1°; 3) grouting, using non-shrink CGM-4 grouting material, with initial setting time controlled at 4-6 hours and 7-day compressive strength after final setting ≥60MPa. Particularly for special-shaped structures such as GRP daylighting roofs, Qinglong has innovatively adopted a composite anchoring process of “pre-embedding + post-installation,” forming a double safeguard through implanted chemical anchor bolts (adhesive pull-out resistance ≥10MPa) combined with pre-embedded steel plates. This construction method has been granted a national utility model patent (Patent No.: ZL2023XXXXXXXXX).

### III. Quality Acceptance Standards: A Full-Life-Cycle Performance Verification System

The “three-inspection” acceptance standard established by Qinglong covers: 1) visual inspection, where the exposed thread length of anchor bolts should be 2-3 times the thread pitch with undamaged threads; 2) mechanical performance testing, with 3 sets randomly sampled from every 500 sets for pull-out tests, requiring the failure load to be ≥1.5 times the design value; 3) durability monitoring, recording anchor bolt strain data through pre-embedded RFID chips and, combined with Qinglong's self-developed smart operation and maintenance platform, achieving 10-year long-term tracking. In the renovation project of Century Plaza on Nanjing East Road, this acceptance system ensured the perfect combination of the UHPC translucent concrete curtain wall and pre-embedded anchor bolts, and the project won the Silver Award of the first UHPC Construction Engineering Innovation Award (AALBORG WHITE Cup). As a vice-chairman unit of the China GRC Association, Qinglong participated in formulating the General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC) (Plan No. 2024-0232T-JC), which also sets normative requirements for anchor bolt installation, promoting the standardized development of the industry. For more industry information: +WeChat qlfsbl123

The installation quality of pre-embedded anchor bolts is the “lifeline” of engineering safety for new decorative materials. With 28 years of full-chain service experience, Qinglong Group deeply integrates material properties, structural mechanics and construction technology, driven by both technological innovation and standard development, providing designers and owners with expert-level solutions from detailed design to after-sales maintenance. Whether it is UHPC curtain walls on landmark buildings or GRG ceilings in theaters, standardized pre-embedded anchor bolt installation techniques are an important guarantee for fulfilling the mission of “creating beautiful architecture.”