At the Bijyogi Interchange of the Expressway Itabashi-Toda Line, the “Makurabari” is installed atop diaphragm walls foundation that are combined with side walls of underpress and used to support a reinforced concrete pier. Static loading tests were performed with regard to the structures for the dual purpose of checking the items stated below and gathering data for planning. 1) Capacity regarding seismic horizontal force. 2) Effectiveness of the “Makurabari” for stress distribution. 3) Reinforcement methods used for the joints of the pier, the “Makurabari” and the walls. The results of the tests clarified the following points. 1) The strength and the ductility are adequate. 2) Based on elastic analysis, the effective width used in the design is safe. 3) One part of the reinforcement of the pier is anchored in the “Makurabari” and the walls. 4) The methods of bar arrangement (longitudinal bar and stirrup) with regard to the torsion of the “Makurabari”.
