Portal Structure Moves Forward
Under 4th Street, between Harrison and Bryant streets, work continues at the launch box site. This site is where tunnel boring machines, Mom Chung and Big Alma, were launched last year. The launch box is now being transformed into a portal (gateway structure).
This rendering shows what the portal may look like upon completion.
The portal will bring the light rail vehicles to the surface and vice-versa, thereby connecting the north and south quadrants of the city. The construction of the portal includes building walls, a floor/ramp and back filling the area. The walls and floor are being strengthened by inserting metal re-bar into the structure.
The floor of the portal is gradually being built into a ramp.
The portal walls are being reinforced with re-bar.
Metal bracing is being installed to support the walls.
Visible surface construction activity for the portal will be seen in December. The portal is estimated to be completed by the 2nd quarter of 2015.
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