What Are the Key Technologies for Achieving High Hollow-Out Rates in UHPC Shapes? Hollow-Out Techniques and Qinglong Group's Structural Innovation

Achieving a high hollow-out rate (≥40%) in UHPC shaping requires breaking through three technical bottlenecks: structural strength, mold making, and production processes. The core lies in balancing the relationship between hollowing and load-bearing through topology optimization design, directional fiber reinforcement, and precision mold technology. In the translucent hollow-out panel project at Shanghai Century Plaza, Qinglong Group determined the optimal hole distribution through finite element analysis (maximum stress ≤5MPa), adopted composite reinforcement with steel fibers (3% volume fraction) and PVA fibers (1%), and used five-axis CNC machined molds (precision ±0.1mm), successfully producing UHPC panels with a 60% hollow-out rate and a thickness of only 15mm, with flexural strength maintained above 12MPa. High hollow-out rate technology has expanded the artistic expressiveness of UHPC.

Structural Optimization and Mechanical Performance Assurance

Topology optimization algorithms are used to remove excess material while ensuring stiffness. Reinforcement ribs (width ≥20mm) are added at the edges of hollowed areas, keeping the stress concentration factor within 2.0. In the Nanning Wuxiang China Resources MixC One project, optimization reduced the weight of hollow-out panels by 40% while maintaining 85% load-bearing capacity.

Mold Making and Precision Forming

Hollow-out molds require high-strength tooling board (density ≥1.0g/cm³), with reinforced structures added at thin rib sections. We developed modular molds to improve demolding success rates. In the Shenzhen Art Center project, molds with a minimum hollow-out width of 3mm achieved a service life of over 200 uses.

Production Process and Quality Control

Vacuum-assisted molding is used to ensure uniform fiber distribution in hollowed areas. The curing regime requires slow heating and cooling (rate ≤10℃/h) to avoid thermal cracking. Qinglong Group uses X-ray inspection for internal defects, achieving a pass rate of ≥99%.

Application Expansion and Performance Enhancement

Highly hollowed panels combine decoration with functions such as light transmission, ventilation, and shading. We are developing ultra-light panels with a 70% hollow-out rate (surface density ≤25kg/m²) for future buildings. Technological innovation never ends.