What Are the Requirements of the Base Wall for Installing UHPC Exterior Wall Panels? Triple Benchmarks of Precision, Strength, and Stability

UHPC exterior wall panels adopt a dry-hanging system. The core requirements for the base wall (typically a concrete shear wall or masonry infill wall) can be summarized as "sufficient strength and rigidity, precise flatness, and stable embedded connections." The quality of the base directly determines the final installation precision, safety, and appearance of the UHPC curtain wall. According to Qinglong Group's standards, the flatness deviation of the base wall should be ≤4mm/2m, and the verticality deviation should be ≤H/1000 and ≤20mm (where H is the wall height). The base wall must also provide reliable and precise load-bearing reference points for the metal connectors.

First, the base must possess sufficient structural strength and overall rigidity to withstand the self-weight of the UHPC panels, wind loads, seismic actions, and other loads transmitted through the connectors. For masonry infill walls, reliable reinforced concrete constructional columns, ring beams, and lintels must be provided to ensure the overall stability of the wall. Before installation, the base must be thoroughly inspected, and areas with hollowing, cracking, or insufficient strength must be reinforced.

Second, flatness and verticality are the foundation for ensuring installation efficiency and a flat, aesthetically pleasing curtain wall. If the base is uneven, extensive adjustments must be made through the connectors during installation, which is not only inefficient but may also cause abnormal stress in the connectors due to over-adjustment. We typically require full scanning of the base with a laser level, grinding down protruding areas, and leveling recessed areas that exceed tolerances with polymer mortar.

Most critical are the connection bases of the embedded parts or post-installed anchors. The embedded part method is the optimal choice, requiring close coordination with the civil works contractor during structural construction to ensure the positional accuracy of the embedded plates (three-dimensional coordinate deviation ≤±10mm) and correct orientation. When post-installed anchors are used (such as chemical anchors or special-type chemical anchors), the strength (typically required to be ≥C25) and integrity of the base concrete must be tested, and on-site pull-out force verification tests must be conducted by professionals to ensure that the design value of the pull-out resistance of each anchor meets the requirements (typically with a safety factor ≥3). Qinglong Group will provide a detailed "Guide for Base Acceptance and Treatment" before construction and dispatch technical personnel to participate in the base handover acceptance, ensuring that the base conditions meet the requirements for precise and efficient installation.