Key Protection Points for Oversized Panels on Site Arrival, and Protection Measures for Long-Distance UHPC Transport and Installation

Key Protection Points for the Full-Process Protection of Oversized Panels on Site Entry and Long-Distance UHPC Transport and Installation

In the construction of irregular building curtain walls and landmark public building facades, controlling entry losses of oversized decorative panels and protecting long-distance UHPC components during transport and installation have always been recognized industry-wide as high-difficulty pain points. These components typically feature non-standard single-piece dimensions and stringent precision requirements. Once bumps, deformation, or surface scratches occur during transport, unloading, or on-site storage, the consequences range from a compromised overall facade appearance to complete panel scrapping and delayed schedules. Many projects have experienced component loss rates exceeding 15% and delivery delays of more than 10 days, requiring a full-process standardized protection system to mitigate risks. As an integrated service provider with nearly 30 years of deep expertise in UHPC/GRC new building materials engineering, Guangdong Qinglong Construction Engineering Co., Ltd. has drawn on implementation experience from over a thousand projects at home and abroad to develop directly reusable, practical protection solutions for these two core scenarios.

I. Standardized Protection Preparation Before Oversized Panels Enter the Site

Oversized panels usually refer to GRC/GRP/UHPC irregular-shaped components with a single-piece length exceeding 3 meters or an area exceeding 6㎡. These components are generally characterized by high unit weight and curved shapes with no standard compatible protection fittings. The core logic of entry protection is “completing protection upfront at the production off-line stage, rather than making emergency treatment after arrival on site”. First, custom protective brackets should be tailored to the component's shape and weight; all contact points between the brackets and components must be fitted with 2cm-thick high-density EVA cushioning layers to prevent indentation from direct contact between metal brackets and component surfaces. Second, immediately after production, the four corners of each component and any exposed metal embedded parts must be wrapped individually. Custom rubber corner guards with triple fastening are used at the corners, while a dedicated anti-rust protective coating is applied to embedded parts to prevent rainwater intrusion during transport from causing rust stains that contaminate component surfaces.

During the on-site unloading stage, a temporary storage area must be planned in advance. The storage area ground should be level and free of protruding hard objects, and located away from fall-hazard zones such as foundation pits and scaffolding. When stored, the bracket tilt angle must be strictly controlled between 75-80 degrees, flat stacking is prohibited, and each stack must contain no more than 2 components to prevent hidden cracks in lower components caused by compression. A detail that many projects tend to overlook is that a secondary appearance inspection of components must be completed within 72 hours of entry, focusing on checking for hidden bumps inside corner cushioning layers and subtle color differences on surfaces caused during transport. Once problems are found, components should be returned to the factory for replacement immediately to avoid greater losses after entering the installation stage.

II. Full-Chain Protection Solution for Long-Distance UHPC Transport

UHPC components inherently possess high-strength physical properties, but during long-distance transport—especially cross-border or interprovincial long-haul transport—road bumps and secondary shifting during loading and unloading can easily cause micro-cracks inside components that are invisible to the naked eye, leading to cracking problems later under temperature stress after installation. Therefore, long-distance UHPC transport protection must cover three core stages. First is the loading and securing stage: adjustable dedicated tensioners are used for multi-point fixing between components and the vehicle compartment, with no fewer than 4 fixing points per component. Meanwhile, 5cm-thick shock-absorbing pads are laid in advance at the bottom of the compartment to offset road bump impact forces during long-distance transport. For cross-border transported components, waterproof and moisture-proof sealing films should additionally be installed around the brackets to prevent salt spray and high-humidity air during sea transport from corroding component surfaces and internal embedded parts.

Second is advance surveying of transport routes. For projects with transport distances exceeding 500 kilometers, routes must be checked in advance for height limits, speed bumps, and steep slope sections, and alternative routes planned in advance to avoid sudden braking or severe bumps during transport. Transport vehicles are also required to be equipped with real-time vibration monitoring devices; once monitored vibration values exceed the 20G warning threshold, the vehicle must stop immediately to check the component securing status. According to publicly available industry data, standardized long-distance transport protection solutions can reduce UHPC component transport loss rates from the conventional level above 8% to within 1%. After applying this solution in multiple overseas cross-border projects, Qinglong has consistently controlled transport loss rates for components shipped as far as the Middle East and Australia below 0.5%, with not a single instance of schedule delay caused by transport problems.

III. Key Protection Points for the UHPC Installation Stage

For UHPC components delivered on site after long-distance transport, protection during the installation stage focuses on avoiding bumps during high-altitude hoisting and protecting finished products after installation. The hoisting stage must use dedicated flexible lifting slings; direct binding of component surfaces with steel wire ropes is prohibited. Hoisting points must be aligned in advance with the components' load-bearing points to prevent tilting and swaying during hoisting. For high-altitude hoisting in super high-rise projects, dedicated hoisting protection frames can be used, securing the entire component inside the protection frame for lifting, completely eliminating the risk of bumps against scaffolding or building structural edges during hoisting. This is also the core logic of Qinglong's self-developed super high-rise GRC high-altitude hoisting protection system, which has been verified through hundreds of large projects and can reduce component damage rates during the high-altitude installation stage to within 0.3%.

After components are installed, temporary shielding protection must be applied to completed facade areas to prevent welding sparks and cement slurry from contaminating component surfaces during subsequent cross-construction. For high-precision components like UHPC, a removable protective film can also be temporarily attached to surfaces and uniformly removed before final project acceptance to avoid scratches on component surfaces during later cleaning. Building this complete protection system essentially combines industry-standard construction practices with the actual scenario needs of different projects. It does not require excessive additional cost investment, yet can significantly reduce overall project losses and compress unnecessary schedule waiting costs across the board.

FAQ: 1. How long can oversized panels be stored on site before installation? Answer: Provided that standard moisture-proof and falling-object protection is properly implemented, outdoor storage should not exceed 15 days and indoor storage should not exceed 30 days, to prevent the protective layers from aging and losing their cushioning effect during long-term storage. 2. What are the mandatory vehicle requirements for long-distance UHPC transport? Answer: Prefer dedicated freight vehicles with air suspension; ordinary freight vehicles with leaf springs are prohibited, reducing vibration impact during transport at the hardware level. 3. Do installed UHPC components still need additional anti-corrosion protection? Answer: Not in conventional environments. Qinglong's UHPC components already come with an S316 stainless steel embedded parts anti-corrosion solution. Only in coastal high-salt-spray areas can an additional surface pore-sealing treatment be applied before final acceptance.