|
Special thanks to
Michael
J. Robison
Resident Construction Manager
Nancy Creek Tunnel
for hosting our visit.
|
Mike, Nancy and Walda putting on required boots, hard
hats and vests
|
Walda
Lavroff (NPU-B Chair, NBCA Zoning Chair),
Nancy Jones (NBCA Environment Chair),
and
Gordon Certain (NBCA President)
are members of the
City's "Citizens Advisory Committee"
for the Nancy Creek Sewer Tunnel Project |
|
Note: A related story will appear in the October 2003
North Buckhead Newsletter |
Entering the Site.
The crane (center) will lower us in basket (center right)
|
|
|
Nancy and Walda in front of basket
|
Click
any of these pictures to enlarge them. |
Gordon in front of basket
|
|
|
View of tunnel shaft floor 150' down through floor of
basket |
|
|
Looking up 150' at crane boom and sky
|
Notice water seeping on tunnel shaft walls. The joints
in the concrete (horizontal lines) are about 10' feet apart.
|
Most of the water seeps in through the joints near
where the soil meets the solid rock starting at about 40' below the
surface
|
|
|
Standing 150' under the Blue Heron Nature Preserve
|
|
|
Photo from east end starter tunnel (near Rickenbacker
Drive, looking west)
|
The tunnel was quite loud -- great volumes of outside
air are blown in through yellow fabric ducts.
|
We were extremely pleased with the relative dryness in
the tunnel. We had heard horror stories about creeks drying up
because they ran down into tunnels -- that was not the case here.
|
|
Notice the narrow gauge railroad tracks on the concrete
floor.
|
|
Small locomotive used to help assemble the Tunnel
Boring Machine (TBM)
|
|
|
Photo looking west from 150' under Roswell Road.
The people are under the Chastain Post driveway.
|
|
|
The water that seeps into the tunnel is pumped out and
treated in a series of sedimentation ponds before it is
"returned" to Nancy Creek.
|
The 60,000 pound main beam of the TBM was being lowered
into the tunnel as we got ready to go home.
|
Close up of the beam. The TBM when complete will
be about 300' long (!) and will bore an 18' tunnel through solid rock at
the rate of about 70' per day.
|
