In central area of Hamamatsu City, lots of planned alleys called ‘Sewari Tsuro’, which are opened backside of each site in small blocks, are remained today. These kinds of planned alleys are very strange and rare in Japan, whilst we have only the other case in ‘Rikai-sen’ of Iida City. Of course, the existence of ‘Sewari Tsuro’ in Hamamatsu City has been unknown sufficiently so far. Therefore, this study clarifies actual situation of and land use long ‘Sewari Tsuro’ empirically by interviews to municipality officer, planning documents research including past maps, field survey, and so on.
It is difficult to find out the origin of ‘Sewari Tsuro’ before WWII because there are only boundary lines between sites or narrow waterway partially. Thus, we can consider that ‘Sewari Tsuro’ was completely and newly implemented by ‘Post-War Reconstruction Land Readjustment’ as the purpose for service road approaching each site from backside. Today from the result of counting ’sections included in same small block’ as one, there are 53 ‘Sewari Tsuro’s. 81.1% of all are ‘1.8～2.7m’ wide, 67.9% are ‘50～100’m long, and 88.7% are either ‘I’ shape or ‘L’ shape. On the other, most of ‘Sewari Tsuro’ are legitimated as Article 42 Section1 road of Building Standard Law, whilst they are narrow alleys.
Characteristics of ‘Sewari Tsuro’ including roadside land use and building condition are classified into eight types as follows, which are the result of multi variable analysis (principal component～cluster analysis), using 10 items on attributes of physical, roadside buildings and sites, land use and approaches to each site.
1. ‘Sewari Tsuro’ approached type of mixed uses of residential and commercial,
2. Backside approached type of commercial and business uses,
3. Front approached type of commercial and business uses,
4. ‘Sewari Tsuro’ approached type with many roadside buildings,
5. ‘Sewari Tsuro’ approached type of residential uses,
6. Long ‘Sewari Tsuro’ type,
7. Specialized type for low-risedresidential uses,
8. ‘Sewari Tsuro’ few approached type with few roadside buildings.
Distribution of each type to large blocks shows actual land use in central area accurately. Additionally, not only ‘Sewari Tsuro’ is functioned by connecting to usual roads but also generates complex and unique pedestrian environment by connecting to another ‘Sewari Tsuro’ mutually and forms exclusive pedestrian network.
This study is for describing over all pictures and holistic characteristics of ‘Sewari Tsuro’ and there are to clarify historical origin in detail as historic study, to clarify the transition from original planning to today as urbanization process study, or to clarify utilizing situation or estimation by residents as improvement issues study as future research agenda.