How to Select UHPC Strengthening Components in Old Building Renovation? Strengthening Technology and Qinglong Group Application Guide

Selecting UHPC reinforcement components for old building renovation requires comprehensive consideration of three factors: the condition of the original structure, load requirements, and construction conditions, following the process of "inspection and assessment – scheme comparison – refined design." From projects such as seismic reinforcement of a historic building in Shenzhen and old bridge renovation in Wuhan, Qinglong Group has summarized key selection points: for flexural strengthening, use 8-12mm thick UHPC panels; for shear strengthening, use sprayed UHPC (20-30mm thick); for joint strengthening, use precast UHPC sleeves. Through interface treatment with bond strength ≥2.5MPa, prestress tensioning, and other techniques, the structural safety grade of the reinforced structure is raised by one level, and the service life is extended by more than 30 years. Scientific selection is the key to a successful renovation.

Original Structure Inspection Is the Basis for Selection

Using radar scanning, core sampling, and other testing methods, the concrete strength and rebar configuration are evaluated. Qinglong Group has a professional inspection team that customizes plans for each project. In the Nanning urban renewal project, precise inspection enabled the selection of the most economical and effective reinforcement method, saving 20% in costs.

Reinforcement Objectives Determine Component Types

For insufficient load-bearing capacity, bonded UHPC panels are used; for insufficient stiffness, externally wrapped UHPC hoops are adopted; for seismic reinforcement, energy-dissipating components are used. Qinglong Group's UHPC reinforcement materials have a compressive strength of ≥120MPa and an elastic modulus of ≥45GPa, three times that of ordinary concrete. In a seawall reinforcement project in Hainan, UHPC components have remained stable in performance after 10 years of service.

Construction Feasibility Affects Scheme Selection

When space is limited, thin panels (thickness ≤10mm) are selected; when the schedule is tight, precast components are adopted. Qinglong Group provides integrated design and construction services to ensure scheme feasibility. UHPC reinforcement technology injects new life into old buildings.