既存戸建住宅の基礎の沈下・傾斜及びひび割れ等に関する実態調査

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Floor incline, differential settlement and cracking of foundation in existing detached houses were investigated. The inspection was carried out, prior to neighboring constructions, to confirm the service life of basement. A total 864 houses in 113 areas on the soft ground in Tokyo metropolitan area was covered. The major findings are as follows. 1. Extent of differential settlement was generally improved in houses built with the current specification of the housing loan corporation but a 10 percent cases on the soft ground area exceeded the permissible limit of 25 mm. This implies that the differential settlement cannot be eliminated solely by a basement construction specification. 2. Extent of floor incline depends on the measured section and showed 20 percent larger value than the measurements at each end of the floor. This maximum angle of gradient was controlled by the differential settlement rather than the foundation construction specification and may become less than 6/1000 when the differential settlement less than 25 mm. 3. Extent of column incline was approx. 2/1000 even without any floor incline. A floor incline less than 4/1000 may be necessary to give a column incline less than 6/1000. 4. No significant relation was found between basement cracking and differential settlement or angle of gradient. A foundation crack width exceeding the control value of 0.5 mm was found in a 20 percent of houses built with the revised specification.
2004-12-30

既存戸建住宅の基礎の沈下・傾斜及びひび割れ等に関する実態調査

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