THROUGH FOUR-INCH HOLES

Wanganui Chronicle, Volume LXXXII, Issue 19477, 21 December 1925, Page 14

THROUGH FOUR-INCH HOLES

MATERIAL FOR A TUNNEL. The old mystery of how a full-rigged ship got inside a narrow-necked bottle is as ntohing to the trick that the New South Wales Commissioners arc providing in building, the Sydney city railway. In effect, they are building a huge underground tunnel to take two sets of rails through 4in holes in the surface of Macquarric Street. Many people wonder what is being done when they see a small boring jfiant putting down holes in that thoroughfare—holes which arc subsequently fenced off from public gaze. Few of them realise that through these small apertures wet concrete is poured right into position rn the wall of the city ra ; lway tunnel. "Working from Hyde Park men are tunnelling under Macquarie Street. As they go they take the spoil out of the open end of the tunnel and then erect timber forms in the tunnel to take the concrete. But to avoid the costly process of mixing the concrete in Hyde Park and trucking it underground right down as far as Parliament Buildings, they simply bore a hole from the street above until it meets the tunnel and then pour the mixture down.