A Structural Survey of the Roof of Mahakan Fortress

Abstract

Mahakan Fortress is one of Bangkok’s only two surviving forts from the early Rattanakosin period and holds significant historical value. The fortress’ wooden roof form and structure are worth recording and studying. This study aims to systematically survey, analyze, and document the roof structure of Mahakan Fortress through an integrated methodology that combines traditional hand-drawn surveying with 3D scanning technology to produce an accurate 3D structural model. The findings reveal that the roof structure of the fort comprises both lower and upper tiers, utilizing a system of curved rafters. The base consists of interlocked timber beams arranged in a cross-shaped configuration, systematically supporting doll columns and other structural components. Data collected from fieldwork and digital scanning were synthesized to construct a 3D model that illustrates the hierarchical configuration of the roof structure, from its foundation to the apex. This study integrates traditional field surveying with 3D scanning to convey structural data. The outcome serves as a basis for further research and conservation.