HIGH-PRECISION CONSTRUCTION TECHNIQUES AND APPLICATIONS FOR WOOD-GRAIN TEXTURED EXPOSED CONCRETE COLUMN-FREE SPIRAL STAIRCASES

Abstract

This paper takes the wood-grain textured fair-faced concrete column-free spiral staircase project at the China Grand Canal Museum as an example, summarizing and presenting its one-time molding construction method. This method utilizes BIM high-precision modeling technology to accurately extract the spatial curve data of the spiral staircase, optimizing the formwork system layout and template splicing scheme to achieve digital construction and ensure high-precision results in a single pour. Furthermore, a steel-wood composite formwork system is employed, using high-strength steel keel support and finely crafted wooden templates for curved surface shaping, guaranteeing the accuracy of the spiral staircase's curves, improving construction efficiency, and ensuring structural stability. Finally, a one-time pouring process is used, employing a layered composite formwork combining pine wood grain panels and fair-faced wood template liners to accurately replicate the texture of natural wood, ensuring a delicate finish after demolding and avoiding the impact of subsequent repairs on the visual quality.