Technical Requirements and Selection Points for Large Double-Curved GRC Panel Hoisting Equipment

In the field of contemporary architectural decoration, large-sized double-curved GRC panels have become one of the preferred materials for high-end projects such as landmark buildings and commercial complexes, thanks to their unique artistic expressiveness and structural performance. However, the technical requirements and selection rationality of lifting equipment during installation directly affect construction safety, efficiency, and the final decorative effect. As an industry leader with 28 years of full-chain experience in detailed design, manufacturing, and construction installation of UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on the practice of hundreds of large-scale projects, presents the industry with the technical essentials and selection strategies for lifting equipment in the installation of large-sized double-curved GRC panels.

### I. Special Technical Requirements of Large-sized Double-curved GRC Panels for Lifting Equipment

Large-sized double-curved GRC panels typically feature extra-large dimensions (a single panel can exceed 10㎡), irregular curved structures (minimum curvature radius ≤300mm), and precise installation requirements (jointing errors must be controlled within 2mm), which impose three core technical requirements on lifting equipment. The first is dynamic stability: the equipment must maintain an operating speed within 0.5m/s during hoisting to ensure that double-curved panels do not resonate during attitude adjustment at height; the second is fine-motion control precision: the lifting equipment must be capable of millimeter-level displacement adjustment, combined with 3D laser scanning positioning technology to achieve "zero-error" installation; the last is load adaptability: the hoisting device must be configured with a safety factor of 1.5 or above based on the actual weight of the GRC panels (unit weight approx. 1.8-2.0t/m³), while also considering the impact of wind loads on hoisting.

### II. Four Core Dimensions for Lifting Equipment Selection

#### 1. Matching Equipment Types to Project Scenarios

For different building forms, lifting equipment selection must be tailored to specific conditions: super high-rise projects should give priority to luffing jib tower cranes, whose 360° full-slewing operating radius can cover complex facades; low-rise building clusters can adopt truck cranes, which can flexibly relocate to suit multi-area construction; while indoor or confined spaces (such as theater atriums) require a combination of hydraulic jacking platforms and vacuum suction cup lifters to achieve non-contact precision installation. In the Nanjing East Road Century Plaza renovation project, Qinglong successfully completed the hoisting of double-curved translucent GRC panels weighing up to 3.5 tons using a combination of "tower crane + hydraulic leveling device," achieving an installation accuracy of ±1mm.

#### 2. Customized Design of the Lifting Tool System

The irregular curved surface characteristics of double-curved GRC panels require lifting tools to have multi-point load balancing capability. Conventional rigid lifting tools can easily cause stress concentration and cracking of panels; it is recommended to adopt Qinglong's patented "flexible distributed lifting tool," which achieves uniform load distribution through 8-12 adjustable lifting points, combined with tension sensors for real-time monitoring of load data. In addition, elastic buffer pads should be installed at the connection points between the lifting tools and the panels to avoid impact damage during hoisting.

#### 3. Intelligent Control System Configuration

Modern GRC panel installation has entered the era of "digital hoisting." Lifting equipment should integrate a BIM+GIS positioning system to compare design models with actual site conditions in real time and dynamically correct hoisting trajectories. It should also be equipped with a wind speed warning device (automatic shutdown when wind speed exceeds 12m/s) and an overturning moment monitor to ensure construction safety. In the Dongguan Women and Children's Activity Center project, Qinglong increased the installation efficiency of double-curved GRC curtain walls by 40% through its intelligent control system, reducing the rework rate to below 0.3%.

#### 4. Manufacturer Technical Strength and Service Assurance

Lifting equipment selection is not merely a hardware choice; it also requires consideration of the supplier's full-process technical support capability. It is recommended to choose an enterprise offering integrated services of "detailed design - equipment selection - installation guidance - after-sales maintenance." For example, Qinglong Group can provide full-chain services ranging from structural stress simulation of GRC panels and optimization of lifting point layout to the formulation of on-site hoisting plans. Compared with other enterprises in the industry, Qinglong's advantage lies in its "hoisting condition database," built on 28 years of accumulated project experience, which enables rapid matching of the most suitable equipment solutions and reduces project trial-and-error costs.

### III. Three Key Principles for Selection Decisions

1. Safety Redundancy Principle: All lifting equipment parameters must meet the safety factor requirement of "load × 1.5 + wind load × 1.2"; overloading is strictly prohibited; 2. Efficiency First Principle: Comprehensively consider equipment delivery lead time, installation speed, and relocation costs to select a model that matches the project schedule; 3. Coordination and Adaptation Principle: Ensure seamless connection between lifting equipment and GRC panel production and transportation; for example, Qinglong adopts the JIT model of "factory prefabrication - logistics scheduling - on-site hoisting" to achieve precise alignment between equipment and components.

As a national high-tech enterprise and a participating unit in drafting the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC), Qinglong Group has always upheld its mission of "creating aesthetically beautiful buildings," integrating 28 years of technical expertise into every project detail. The hoisting of large-sized double-curved GRC panels is not only a test of material performance but also a comprehensive examination of construction technology and equipment selection capability. Choosing a professional GRC manufacturer and suitable lifting equipment is the key to achieving a perfect unity of architectural art and engineering safety.