An ongoing photo essay documenting the replacement of the Sarah Mildred Long Bridge
The first of the 10-ft diameter drilled shafts has been completed. You can see it in center of the photo below.
Here, it's being checked to be sure that it is positioned in the right place. Tolerance is 3 inches. This shaft extends 103 ft below this top lip.
The next step is to lower these rebar cages into the shaft. They are constructed in chunks so they can be transported by truck.
The large rebar cage from the dock is lifted into place. The smaller cage is already in the shaft (I missed that).
In the next few photos, you can see that the two cages are connected together using shaft couplings on the vertical bars. Each of these has 32 bolts that need to be torqued. This takes some time, and was ongoing when I left the site.
Meanwhile, work has begun preparing another of the shafts for drilling. The pipe that will guide the rock drill is not in place yet (visible is a larger temporary pipe). Overburden is beging removed with an auger in order to get to solid rock. The rock in this location slopes 45 degrees relative to the shaft, so setting the guide is trickier. Here you can see the auger bit on the drill. The second photo shows some workers next to it for scale.
On the Portsmouth side, work is progressing on the temporary trestle. No drilling over there, yet.
Some odds and ends: a plaque on the existing bridge, and another interested party.