Creation of regional safer in-fill areas through consideration of durability and fire retardation of wood constructions

对东京本戈区的城市安全填筑进行了财政调查，该地区在二战前就存在着大量的老旧腐朽木屋，其中一些被改造成一居室式的公寓，这意味着这次调查的实际目的是为了重塑城市火灾发展过程的验证方法。通过调查实践发现，防护建筑的耐火性和位置是相当重要的因素。此外，如果采用生命路网宽度元素，将进一步突破区域填充区降低燃烧蔓延能力评价方法的质量，并利用锥形量热计阐明强风条件下多个燃烧建筑物之间的共燃形成行为和纯木或火处理木材的放热率。此外，为了减少区域填充区的火灾风险，还对桥墩、桥柱和桥下电力电缆的高强混凝土的耐火性能进行了研究。其中一个系列研究项目于2001年12月在澳大利亚举行的第五届国际火灾科学与工程研讨会上获得一等奖。通过TINS研究项目，作者认为，区域木质填充区的耐火评价方法将比以往任何时候都更先进。

A fiscal investigation on urban safe in-fill was carried out in Hongo district in Tokyo, where there have been existing a great number of old and decayed wood houses before World War II, although some of them were re-constructed into one-room type of flats, which means the actual purpose of this investigation in order to remodel the verification method on urban fire developing process. Through the practice of this investigation, it becomes clear that the fire resistance and location of protective buildings are quite important factors. In addition, if the element of the width of life-road networks be adopted, a break-through to elevate the quality of evaluation method of reducing the ability of flaming and spreading in regional in-fill areas would be promoted further, together with clarifying behaviors of co-flaming formation between several burning buildings under strong windy conditions and heat release rate of pure wood or fire treated wood by using cone calorimeter. Moreover, in order to reduce a fire risk to regional in-fill areas, some other research are carried out concerning fire resistance of high strength concrete for bridge pier or columns and power cables underneath the bridge. One of these series research projects succeeded to get the first prize award at the 5th International Symposium on Fire Science and Engineering held in Australia in Dec., 2001. Through tins research project, the authors believe that an evaluation method on fire resistance in regional woody in-fill areas would be more advanced than ever before.