The purpose is to propose measures to protect the living environment around flagpole-shaped sites. Therefore, the location conditions and rebuilding situation are grasped for flagpole-shaped sites in Setagaya. In addition, a spatial analysis will be conducted on the impact of the living environment on the large-scale rebuilt building and its surrounding buildings.
First, using the i-Map published by Setagaya and Zenrin's Digitown, etc., we extracted 563 condominiums on flagpole-shaped sites under the conditions of the flagpole site and housing complex in Setagaya. Regarding the status of flagpole-shaped sites in Setagaya, there was a tendency for a large flagpole-shaped sites in the western part of Setagaya and a small flagpole-shaped sites in the eastern part.
Chapter 3 examined the possible land conditions for flagpole-shaped sites in the future. As a result, it was found that the site scale is larger in areas where vacant houses are concentrated or where the agricultural land rate is higher. In addition, the relationship between the production green space and flagpole-shaped sites has revealed that the production green space has been converted into residential land and the flagpole site has not yet been born.
In Chapter 4, we examined only 167 locations with a large site size of 100 square meters or more, especially if the impact on the buildings around flagpole-shaped sites is large. It was confirmed that 42 locations were rebuilt in 10 years, and more than 60% were rebuilt from detached houses to apartment houses. In particular, as a condition for building a housing complex on the former site, (1) two detached houses lined up, land that was destroyed at the same time, (2) a detached housing area with a garden, and (3) land where the housing complex was built (4) large parking lots. In addition, it was confirmed that more than half of the buildings with a scale of 300 square meters or more were rebuilt to double the building volume.
In Chapter 5, we analyzed the impact on the dwellings around flagpole-shaped sites site where there were buildings that had been rebuilt to be larger than before. As a result, it was found that, under the following conditions, not only the sunlight in the building was reduced, but also the adjacent buildings were deprived of sunlight. When a large-scale land is divided and multiple buildings are built, or a building is built on the land surrounded by all sides. However, it can be said that the deterioration of sunshine in a three-floor building can be reduced by changing the shape of the building from the north side to the second-floor level or by providing a space between the building adjacent to the south side.
Based on the research, the following are measures for protecting the living environment around flagpole-shaped sites. The building on flagpole-shaped sites must have a certain amount of space and surrounding housing for sunshine. Buildings built on land that is not in contact with roads or buildings that are far from roads should be regulated regardless of site size.
