Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

Construction of Piled Raft Foundation for High Rise Building Using Precast Concrete Piles
K. Nishio; Kozo Keikaku Engineering Inc., Japan K. Maehara; Asahi Chemical Construction Materials Co. Ltd, Japan

The piled raft foundation is adopted in Japan, as the foundation of high rise building, 35 stories and 130 m in height. The building is a hotel, located in Kobe, an international port city in the western part of Japan. In Japan, the foundations of such high buildings are usually designed as raft foundations, which are embedded in the firm diluvial stratum. The construction site is reclaimed ground and the geological survey of the site showed that the soil profile is very complicated and a firm stratum suitable for raft foundation could not be found over 50 m below the ground level. Thus, a "piled" raft foundation was designed for this project. The piles are prestressed precast high strength concrete piles, 60 mm in diameter, 17 m in length, and they are driven by hydraulic hammers into the diluvial sand, penetrating through soft sand and clay strata. Some piles are equipped with load cells and distribution of the live load along the pile shaft is continuously measured. This paper describes the design concept of the foundation, results of field loading tests, and the case history of the piles during and after driving.

 article #481; publication #37 (IC-1991-IT)