Prefabricated non-dismantling multifunctional formwork technology for ultra-high arch dams in severe cold regions

Abstract

A multifunctional non-dismantling insulation formwork technology for ultra-high arch dams in severe cold regions is proposed to address critical challenges such as the shortage of construction periods, significant cross-interference during construction, and the detachment of permanent insulation layers during operation. By combining structural optimization design, numerical analysis, and model testing, this article proposed the structural design and bearing capacity verification of the formwork under harsh service conditions. The result demonstrate that the final composite multifunctional formwork structure meets the performance requirements under complex external loads, including water load, wind load, temperature load, ice pulling, and ice pressure. The design effectively integrate the functions of insulation, construction formwork, anti-ice-pulling, and anti-seepage. Furthermore, the non-dismantling formwork eliminates the need for removal after built, thereby simplifying the construction process, reducing cross interference during construction, and resolving issues related to both permanent and temporary insulation. This approach provides a comprehensive solution to the durability problems of high arch dam insulation systems during operation under complex cold conditions, meeting the requirements of temperature control and crack prevention.

Keywords

severe cold regions / ultra-high arch dam / non-dismantling multifunctional formwork