DESIGN OF THE MIX PROPORTION AND APPLICATION OF THE NEW PRELINING SUPPORT METHOD TO A TUNNELLING WORK

Abstract

The New PLS (New Pre-lining Support) Method is one of pre-lining methods in which the perimeter of a tunnel face is excavated with a chain cutter and immediately reinforced with a concrete shell. Firstly, this method was applied to widening Hodogaya Tunnel of New Yokohama Highway. Secondly, it was applied to Yoshii Tunnel of the Yokohama-Yokosuka Highway.
In this paper, test method and test results to select the slit concrete mix using quick hardening additive, accelerator, and setting modifier are described. This method was experimentally adopted in Yoshii Tunnel and the good results were obtained.