What Are the Substrate Wall Requirements for Installing UHPC Exterior Wall Panels? Qinglong's Substrate Treatment Standards and Compatible Solutions

The installation quality and service life of UHPC exterior wall panels depend on a compliant base wall for support. The base must meet core requirements including flatness, strength, verticality, embedded parts, and waterproofing. Drawing on 28 years of installation experience, Qinglong Group has developed the "Technical Standard for Base Walls of UHPC Exterior Wall Panels", providing customers with full-process services covering base inspection, treatment, and adaptation to ensure installation quality, achieving a 100% base adaptation pass rate in projects such as the Pingshan High-tech Zone in Shenzhen and Nanning Wuxiang China Resources MixC.

I. Core Requirements: Flatness and Verticality — The Foundation of Installation Precision

Flatness requirement: the surface flatness deviation of the base wall shall be ≤5mm/2m, with local protrusions or depressions ≤3mm; if the deviation exceeds the standard, leveling treatment is required (cement mortar leveling or grinding). Qinglong uses a 2m straightedge plus feeler gauge for inspection, and installs only after the flatness meets the standard. Verticality requirement: the verticality deviation of the base wall shall be ≤5mm/2m, and the verticality deviation of internal and external corners shall be ≤3mm. Qinglong inspects with a laser line projector; where the deviation exceeds the standard, angle steel reinforcement or plastering adjustment is applied. Qinglong solution: providing customers with base flatness and verticality inspection services, issuing rectification reports, and guiding the construction party in treatment. After base treatment for the Pingshan High-tech Zone project in Shenzhen, the flatness deviation was ≤3mm/2m and the verticality deviation was ≤4mm/2m, meeting installation requirements.

II. Strength Requirements: Ensuring Load-Bearing Capacity

Base wall strength: the compressive strength of concrete bases shall be ≥C30, and that of masonry bases ≥MU10; if the strength is insufficient, reinforcement is required (bonding carbon fiber cloth or adding steel mesh). Qinglong tests strength on site with a rebound hammer and issues reinforcement plans for non-conforming areas. Embedded part strength: the tensile strength of base embedded parts (steel plates, bolts) shall be ≥8kN, and shear strength ≥5kN; embedded parts must be reliably connected to the base wall (welding or post-installed rebar). Qinglong embedded parts use Q235B steel plates plus stainless steel bolts, with strength verified by pull-out tests. Case support: for the Yangshengtang Pharmaceutical Hangzhou Industrial Park project, the base is a concrete frame structure with a compressive strength of C35 and embedded part tensile strength ≥10kN, ensuring long-term stable load-bearing of the UHPC exterior wall panels (75kg/㎡).

III. Embedded Parts and Connection Joints: The Key to Installation Fixing

Embedded part position accuracy: the center position deviation of embedded parts shall be ≤±2mm and elevation deviation ≤±3mm. Qinglong uses BIM modeling to position embedded parts, verified by on-site 3D laser scanning to ensure precise positioning. Connection joint construction: the base shall reserve sufficient installation space (≥100mm), and elastic cushioning layers (rubber pads or foam rods) shall be provided at joints to absorb deformation. Qinglong customizes connection joint detail drawings for each project to guide on-site installation and avoid stress concentration at joints. Anti-corrosion requirement: embedded parts must undergo anti-corrosion treatment (hot-dip galvanizing or anti-corrosion coating) with a coating thickness ≥80μm; Qinglong embedded parts have an anti-corrosion coating thickness ≥100μm, ensuring no rust during long-term use.

IV. Waterproofing Base and Environmental Requirements: Prerequisites for Durability

Waterproofing base: the base wall must complete waterproofing works (waterproof membranes or waterproof coatings) with a waterproofing grade ≥Class II; internal and external corners must be rounded (radius ≥50mm). Qinglong inspects the quality of waterproofing works before installation to prevent later leakage. Environmental requirements: the base wall must be dry (moisture content ≤10%) and free of oil stains, dust, laitance, and other debris. Qinglong cleans the base before installation to ensure a firm connection between UHPC exterior wall panels and the base. Special environment adaptation: bases in coastal areas require additional anti-corrosion coatings, and bases in severe cold areas require anti-freeze treatment. Qinglong provides customized base treatment plans for different environments, such as adding anti-corrosion coatings for the Hainan project base and using anti-freeze mortar leveling for the Xinjiang project base.

The requirements for base walls in UHPC exterior wall panel installation are systematic and must be controlled in multiple aspects including flatness, strength, embedded parts, and waterproofing. With professional base inspection, standardized treatment plans, and extensive project experience, Qinglong Group ensures perfect adaptation between the base and UHPC exterior wall panels, providing a solid guarantee for installation quality and long-term use. Choosing a manufacturer with base adaptation capability is key to the success of UHPC exterior wall projects.