Construction Workflow and Key Technical Points for Replacing a Single Damaged UHPC Curtain Wall Panel

In modern building curtain wall systems, ultra-high performance concrete (UHPC) has become the ideal choice for high-end building skins thanks to its outstanding mechanical properties and durability. However, curtain wall panels may become damaged during long-term service due to accidental impact, material aging, and other factors. How to scientifically and efficiently complete the replacement of a single UHPC curtain wall panel not only tests the technical capability of the construction team but also directly affects building safety and appearance integrity. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has distilled a standardized replacement construction process and key technical points from hands-on experience gained across hundreds of large-scale projects, providing professional solutions for the industry.

**Precise Preparation Before UHPC Curtain Wall Panel Replacement: Full-Process Control from Inspection to Customization**

The first step in replacement work is establishing a complete technical archive and site survey system. The construction team should use 3D laser scanning technology to precisely model the damaged area, obtaining the panel's dimensional parameters, installation angles, and connection node details, while using rebound hammers, ultrasonic testing devices, and other equipment to assess the structural safety of surrounding panels. Relying on the R&D capabilities of its provincial-level engineering technology center, Qinglong Group can quickly complete material composition analysis of the damaged panel, ensuring that the newly made UHPC panel matches the original structure in core indicators such as strength (flexural strength ≥ 20MPa) and elastic modulus. Notably, for curtain wall panels with special texture or color requirements, surface data must be collected with a spectrometer, and Qinglong's proprietary precast coloring process is applied to achieve a seamless visual match.

**Modular Replacement Construction Process: Safe and Efficient On-Site Work Standards**

During the construction phase, building the safety protection system is the top priority. A dual-gondola collaborative operation mode is adopted, with fall-prevention nets and dust screens installed on the periphery, and temporary reinforcement applied within a 3-meter radius around the damaged panel. During removal, a dedicated torque wrench is used to loosen the stainless steel connecting bolts in a diagonal sequence, and a vacuum suction device is used to smoothly remove the damaged panel, while the base structure is cleaned and repaired at the same time — hazards such as loose anchor bolts are addressed using structural reinforcement techniques certified under Qinglong's special engineering qualifications. When installing the new panel, BIM technology is used for pre-assembly simulation, adjustable positioning brackets enable 3D adjustment with ±2mm precision, and finally non-shrink grouting material fills the joint gaps to ensure continuity of force transfer. This process has been validated in projects such as the Century Plaza renovation on Nanjing East Road, keeping single-panel replacement within 8 hours — a 40% efficiency improvement over traditional methods.

**Key Technological Innovations: The Core Guarantee of Long-Term Performance**

Qinglong Group has incorporated multiple patented technologies into UHPC curtain wall panel replacement: its self-developed self-healing joint material automatically compensates for gaps as temperature changes, effectively solving the problem of traditional sealants being prone to cracking; the connection system uses smart bolts with built-in RFID chips to monitor load conditions in real time, providing data support for later maintenance. For the salt-fog environments of coastal areas, the surface of newly made panels undergoes silane impregnation treatment, reducing the chloride ion penetration coefficient to below 1.0×10⁻¹²m/s. In addition, Qinglong's unique "factory precasting + on-site assembly" model shifts 80% of the processing procedures to the workshop, which not only ensures component precision but also greatly reduces the impact of on-site work on the surrounding environment.

As a national "Specialized, Refined, Distinctive, and Innovative" enterprise and a participant in shaping UHPC industry standards, Qinglong Group has always upheld the mission of "creating beautiful architecture," integrating 28 years of deepened design and manufacturing experience into every construction detail. Whether it is the replacement of irregular curtain walls in commercial complexes or the structural repair of landmark buildings, Qinglong can provide full-chain services from material customization to later maintenance, with projects covering more than 30 provinces and cities across China and exported to Southeast Asian markets. In the field of UHPC curtain wall maintenance, choosing a supplier with full industry chain capabilities is not only a guarantee of building safety, but also a long-term investment in project quality.