解説
ガス導管敷設工事の環境影響評価
キーワード:
City gas,
excavated soil,
life cycle assessment（LCA）,
life cycle impact assessment method based on endpoint modeling（LIME2）
2011 年 7 巻 4 号 p. 351-359
詳細
2011 年 7 巻 4 号 p. 351-359
Objective. When we excavate a road for burying gas pipes, excavated soil is generated. City gas companies make efforts 3Rs（Reduce, Reuse and Recycle）for excavated soil aimed to establishment of a sound material-cycle society. In this paper, I introduce the case study of life cycle environment impact assessment of gas pipe burying works based on LIME2.
Results and Discussion. The following results were obtained
1） Environmental load of trenchless method is the smallest in all 3Rs construction methods which were evaluated in this study.
2） Although use of recycled materials（recycled base course materials, recycled asphalt and improved soil）have a large impact in terms of CO2 emissions compared with virgin materials（pit sand etc）, damage cost（integration result）of use of recycled materials are smaller than that of use of virgin materials.
3） A combined 3Rs methods for gas pipeline works is effective to reduce environment impact. Damage cost of combined methods is as low as that of trenchless method.
Conclusions. These results showed that promotion of 3Rs in gas pipe burying works contributes to the prevention of global warming and the conservation of biodiversity. Furthermore, improvement in the assessment of biodiversity, for example, impacts of excavated soil dumping on the ecosystem is expected.
