Tunnel lining
AssigneeFairclough Construction Group Limited
InventorNorman S. Thomas
Life of this patent
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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.
Claims18
A concrete segment for an annulus of a tunnel lining, having an end connectable to an end of another, identical, segment of the annulus abutting thereagainst by means of connecting dowels insertable from an edge of the segment other than the abutting end thereof into at least two channels within the segments, each channel extending through an edge of the segment and in alignment with the end of and partially into 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.
An annulus according to 9, including an invert segment provided at both ends with blind internal channel portions to register with channel portions in segments adjacent thereto to receive dowels connecting the insert segment to the segments adjacent thereto.
Dependencies are inferred from the claim text.