Patents Assigned to Fairclough Construction Group Limited
  • Tunnel lining
    Patent number: 4104885
    Abstract: A concrete segment for a tunnel lining, having an end connectable to an end of another identical segment abutting thereagainst by means of connecting dowels insertable from an end of the segment remote from the abutting end thereof or from one side of the segment into two channels within the segments, each channel extending through an end of the segment and into the end of said abutting segment, the channels being disposed at an angle to one another whereby the segments are held together when the dowels are in position.
    Type: Grant
    Filed: June 15, 1977
    Date of Patent: August 8, 1978
    Assignee: Fairclough Construction Group Limited
    Inventor: Norman S. Thomas