排水立て管システムの排水能力予測手法を用いた通気弁の性能評価に関する研究: 通気弁の通気特性と排水能力への影響

摘要

This study discusses the evaluation of influences on the drainage capacity of a drainage stack system with an air admittance valve by means of the drainage capacity prediction method, which was previously proposed by the author, while looking into the effectiveness of the method. The study also aims to propose a method to reduce labour and cost incurred by drainage capacity experiments. To be more specific, through this study, the following two points have been clarified: (1) Vent characteristics of five commonly available air admittance valves were identified using a simple experimental apparatus and the relationship between the airflow rate and the air flow resistance coefficient was acquired; (2) The results acquired from (1) were applied to the previously proposed drainage capacity prediction method and subsequently, it was found that the discrepancy between the estimated value and the actual value remained within ±10%, demonstrating that the method is effective in practical application.%旧建築基準法では、排水システムの通気管の端部は、「直接外気に 衛生上有効に開放すること。」のみが規定されていた。そのため、外 気に開放することなく屋内処理が可能な通気弁は、それに抵触する ことから1987年に欧州より移入された製品が、始めて旧建築基準法 第38条の適用を受け使用が許可された。