COMPOSITE FOUNDATION OF PILES AND CONTINUOUS UNDERGROUND WALL

摘要

PROBLEM TO BE SOLVED: To provide a composite foundation of piles and a continuous underground wall, which efficiently and sufficiently bears axial-force load of a building built on soft ground, according to the ground structure, damps responsive displacement at the time of an earthquake to improve the habitability of the building, brings about upper skeleton reduction and change in structural type by virtue of reduction of input to a superstructure, achieves reduction of a pile cross sectional area and countermeasures against liquefaction, and contributes to total cost reduction and shortening of a construction period even if the continuous underground wall is employed.;SOLUTION: The soft ground 12 includes an intermediate layer 32 which is lower in rigidity than bearing ground 22 but higher than an upper layer 30. The continuous underground wall 18 is constructed so as to reach the depth of the intermediate layer 32, and the plurality of piles 16 reach the depth of the bearing ground 22. Then piles 16a at outermost locations out of all the piles 16 are arranged so as to correspond to the location of the continuous underground wall 18, united with the continuous underground wall 18, and each have a diameter larger than the thickness of the continuous underground wall 18. Therefore the piles 16 bear the axial-force load of the building 10, and the continuous underground wall 18 mainly bears only horizontal load at the time of an earthquake.;COPYRIGHT: (C)2006,JPO&NCIPI