Construction—EMEA—Bosnia and Herzegovina—Hydro & Marine Structures
Ready for the Future: DYWIDAG Strand Anchors with DYNA Force ®
Sensors secure Grancarevo
Dam
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The Grančarevo Dam is located on the Trebišnjica River in the southeast of Bosnia and Herzegovina near its border with
Montenegro. With a height of 123m, this arch dam, near the town of Gornje Grančarevo in the municipality of Trebinije, is
the country’s highest dam. The adjacent Bileča Reservoir is the largest reservoir in Bosnia and Herzegovina in terms of
active storage.
The Grančarevo Dam went into operation
in 1967, and the two hydroelectric power
plants, Trebinije-1 and -2, with a total output
of 188MW were completed in 1968 and 1979. El-Iso Strand Anchors in lengths of up to
61.5m. This system has been approved for
permanent use (applications with a 100+ year
design life).
Recently, the monitoring systems for the
safety of the dam were rehabilitated and
modernized. In order to ensure the long-term
stability of the dam, permanent Type 12-0.62"
DYWIDAG Double Corrosion Protected (DCP)
Strand Anchors were installed in the right flank
of the slope directly underneath the arch dam.
The anchors used were electrically testable By electrically uncoupling the anchor head and
the tendon from the anchor plate, a resistance
test between the anchor and the soil can be
carried out – the integrity of the corrosion
protection sheathing can be tested at any point
of time in the future by the use of standardized
resistance tests. Furthermore, the El-Iso
System complies with SIA requirements.
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In order to allow the owner to continuously
monitor the prestressing forces in the strand
anchors, 46 DYNA Force ® Sensors were
installed in the bond length of 23 anchors.
The DYNA Force ® Sensors also provided
an additional mechanism for monitoring the
forces during tensioning. Additionally, DSI
supplied 4 multiplexers with a stainless steel
casing for permanent outdoor use that were
connected to the DYNA Force ® Sensors in
the anchors. Furthermore, DSI engineers
installed a readout unit and a controller
to automatically read the data.