小野田徳利窯の明治期における改修について

概要

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The construction of Onoda Bottle Kilns for cement manufacture had started in 1881 at Taiheiyo Cement Corporation. The only kiln in existence completed in 1883 was specified for the cultural asset in 2004. For certifying the process of refurbishment in Meiji era and Taisho one, the excavation research of the circumference, the documentary one including drawings and old photographs, and the measurement survey with the kiln were carried out. The following items were obtained; 1) At the beginning, the kiln configuration was bottle, and changed through oval and bottle with several stories to rotational cylinder. 2) The kiln was consisted of the two parts, namely the cubic burning part (the lower) and the conic chimney one (the upper) which were refurbished-for repairing cracks caused by high temperature heating, thermal shock, and frost damage etc. 3) The three-storied workshop was attached to the kiln at the completion time. 4) The wall of chimney was consisted of three layers, and the bricks of external one and the inner one for lining were laid with header bond, and the middle one with stretcher bond. 5) Thirteen reinforcing steel bands surrounding the chimney with three kinds of connecting pattern were guessed to be replaced some times. 6) The bricks at the completion time were produced by cast molding, and those at the improvement one were done by extrusion molding.
2006-05-30