A Case Study by the Gyropress Method in Consideration of Neighboring Residential Areas

抄録

The objective of this project is to install steel tubular piles used as a temporary earth retaining wall as well as the main wall for an open cut structure by the Gyropress Method, because the ground was stiff, and there were some areas where the ground surface was uneven, and the piling work had to be conducted adjacent to residential houses. Among the technical challenges, the construction adjacent to residential houses was severe, only 1.5 m away at the closest location. One countermeasure was taken so as to prevent objects from being scattered over the residential houses, and the piling operation was carefully conducted within the allowable noise and vibration level. In spite of another countermeasure taken, slurry overflowed from the steel tubular pile, due to the stiff ground of shale layer that was prone to plugging. It was likely that the construction would be delayed, and dust would be scattered. As a measure, pre-cutting piles and a specially fabricated jig were used, and it was fortunately possible to solve the problem. In addition, vibration and noise never went over the maximum required value, and the construction was completed without any complaint. This paper introduces this construction case.