Eduardo
Donoso writes:
The
most difficult part of an antenna foundation construction is the installation
of the steel inserts. Each antenna sits on the foundation supported at three
precisely positioned semicylindrical structures.
The tolerances are within tenths of millimeters. To locate these properly
on the foundation, the Antenna IPT has designed an installation jig, which
was used
yesterday (27 July) for the first time.
I
want to congratulate the Antenna IPT for the design, which worked smoothly and
the required tolerance requirements were achieved. I also want to congratulate
Martin Mundnich for his dedication and effort in the jig construction and
direction during its installation.
1) Photo 005 Bottom section of jig
installed and bolted to concrete foundation
2)
Photo 014 Top section of jig with inserts (yellow)
3)
Photo 008 Both parts of the jig installed, calibration process. Shaded from the
sun.
4)
Photo 035 Insert hanging from jig, calibration still under way.
5)
Photo 011 Grouting first stage. We poured a layer of grout up to bottom of
insert, let it settle and rechecked tolerances. Readjustment was necessary.
Then the rest of the grout was poured.
6)
Photo 051 Grout finished
7)
Photo 054 Coverage to keep temperature during curing process. Nights are cold
at the OSF.