Volume II - Kildare.ie
Volume II - Kildare.ie
Volume II - Kildare.ie
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N7 Naas Road Widening & Interchanges Scheme<br />
Environmental Impact Statement 172<br />
June 2001<br />
<strong>Volume</strong> 2<br />
INTERCHANGE OVERBRIDGES<br />
Bridge Class of Road C/way Median Footway Parapet Total Width<br />
Johnstown<br />
Interchange<br />
Bridge<br />
Kill<br />
Interchange<br />
Bridge<br />
Castlewarden<br />
Interchange<br />
Bridge<br />
Dual c/way<br />
Link Road<br />
Single c/way<br />
Link Road<br />
Single c/way<br />
Link Road<br />
9.17.1.1 Options Considered<br />
15m (incl.<br />
median)<br />
2.0m 2 x 2.0m 2 x 0.5m 20.0m<br />
7.5m - 2 x 2.0m 2 x 0.5m 12.5m<br />
7.5m - 2 x 2.0m 2 x 0.5m 12.5m<br />
TABLE 9.17.1<br />
Three structural options were considered for each bridge:<br />
Option A 2 span continuous plate girder with composite concrete deck, supported<br />
by reinforced concrete abutment and p<strong>ie</strong>r walls. The abutment walls are<br />
located in the upper half region of the embankment side slopes, ensuring<br />
an open appearance of the bridge on approach.<br />
Option B 4 span continuous steel beams with composite concrete deck supported<br />
by reinforced concrete abutments located at the top of the embankment,<br />
and by p<strong>ie</strong>r walls in the central median and the carriageway verges.<br />
Abutments are in the form of bank seats founded on granular fill<br />
material.<br />
Option C 4 span continuous precast concrete Y beam deck with a composite insitu<br />
concrete slab, supported by reinforced concrete abutments located at the<br />
top of the embankment, and by p<strong>ie</strong>rs in the central median and at the<br />
carriageway verges. Abutments are in the form of bank seats founded on<br />
granular fill material.
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