Case Study on Estimation of Ground Information with the Use of Construction Data in Press-in Method

抄録

The Press-in Method is a pile construction method in which a pile is statically pressed-in by holding the reaction piles. With the method, it is possible to reduce noise and vibration that usually emanate in conventional pile installations, and to shorten the construction period of temporary works. This construction method is widely adopted especially in urban areas for this advantage. In addition, piles can be installed into hard ground by the Press-in Method assisted with augering, or by the Press-in Method assisted with rotary cutting. The application range of the Press-in Method is spreading more and more. In the Press-in Method, construction data such as time, depth, press-in force and torque can be automatically and continuously recorded, and are used e.g., in construction management.

Using the construction data collected from the three methods (the standard Press-in Method, the Press-in Method assisted with augering and the Press-in Method assisted with rotary cutting), IPA(2017) has compiled methods of estimating ground information at the location of the pile toe. In this paper, validity of the estimation methods was examined, estimating ground information by the three methods with the construction data obtained in the field, and comparing it with the already given ground information. In addition, demonstrated was possibility of extending construction conditions that constitute premise for the application of the estimation methods.