No. 3

I’s in place under Surface Ry.  Tracks.  Elevated Ry. carried on Temporary Shoring Girders, and Girders C in place. 24” Water Main carried on Timber Cradle and sewage carried through Pipe R.  Foot Walk carried on Girders C in place on West Side of Avenue.

No. 4

Elevated Railway carried on Bents under Columns.  Temporary Shoring Girders removed and Permanent Bents resting on Girders C in place.  Bents in place on Girders C carrying Surface Railway.  East and West sides of Avenue excavated down to Sub-Grade and Five rows of Permanent Steel in place on each side.  Bents erected on Permanent Steel to catch ends of Girders C while 2 outside Concrete Piers are removed and 6th row of Permanent Steel on each side is put in place.

No. 5

Two outside Concrete Piers removed and 6th row of Permanent Steel in place.  Girders C carrying all structures now resting on Bents on Permanent Steel. 48” C.l.  Sewer carried on Brackets on Girders C.

No. 6

Excavation Completed. ]

Temporary raker braces were placed against the structure to prevent lateral movement.  Four sets of these temporary shoring girders were used in this manner, two sets starting at the north end and two sets at about the middle of the work, and these sets were moved south as they were released.

The columns being thus supported on temporary shoring girders, the old foundations were removed and the excavation was taken down to a level about 16 ft. below the surface.

Two sets of three of the girders “C” were then put in place under the avenue at each column, each set being placed on four concrete piers 6 ft. square with spaces of 4 ft. between them, so that the outside of the outside pier would be 18 ft. from the center of the avenue and 32 ft. from the house line.  This is shown on Fig. 5 and on Fig. 3, Plate XLVII.  Four small piers were used, as they could be more easily removed than one continuous pier.  The girders “C” were set to line and grade, and the piers were built under them, great care being taken to get the concrete well under the girders so as to give a firm bearing.

After these girders “C” were in place it was necessary to remove the temporary shoring girders before the bents could be erected on girders “C” to support girders “B,” being in the same plane; and provision had to be made to support the structure while this was being done.  Therefore, double bents were erected directly beneath the columns, as shown by Figs. 2, 4, and 5, and by Fig. 3, Plate XLVII.  These were built with their sills resting on the girders “C,” and blocking was put in between the sills and the rock to carry the full weight of the structure.  Later, when the weight of the structure was carried on the permanent bents, this blocking was knocked out, but the bents were left in to carry the weight of the column itself,