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General
Description
The project consists of constructing a New Grade Sparation
at Tayounneh Roundabout (650 m long) to improve and ensure better
circulation and mobility in accordance with the Traffic analysis and
International Standards requirements.
The
Works
The
Works consist of upgrading the Tayounneh roundabout that connects the
main four corridors: Chatila, Sami
El Solh Avenue, Omar Beyhum Street, and Old Saida Road.
It covers a total length of 650 meters approximately.
The
Works include the execution of :
· A tunnel of 130m
length, at the Old Saida Road, with two one-way lanes, for vehicles
heading to Omar Beyhum street, and the access ramp that leads to the
tunnel.
· Two underpasses
at the location of the roundabout, each of 20m length, and 2 x 2 lanes
separated by walls, for the traffic heading from Omar Beyhum Street
towards the Old Saida road and vice-versa.
· An open
circulation trench with 2x2 lanes separated by a median lane, that
connects the two underpasses, and another open trench 110m long
approximately that connects the tunnel with the underpass 2.
· The access ramps
that joins the underpasses with the upper roads on Omar Beyhum Street and Old Saida Road.
The
presence of a water table at a depth of 3 to 6m below the existing
sloping pavement has imposed to foresee all the tunnel and underpasses
bottom slabs in raft foundation, and the walls in reinforced concrete,
forming a closed frame having a width of 8m in each direction (2x2
lanes). The retaining walls have a height varying between 2m and 8m
approximately, their foundation was foreseen in raft for those who rest
on water.
Water
infiltration is prohibited in the closed reinforced concrete frames of
the underpasses and tunnel and in the U-sections of the open trenches
by the execution of a tanking-waterproofing system formed by a
waterproofing membrane and protection as described in division 5 of
these specifications. On the vertical parts, the waterproofing membrane
shall extend to 1.5m above the watertable and a damp proofing coating
shall be used in the remaining vertical parts above the watertable. A
previous gravel bed of 50 cm encompasses the structures and the tanking
system.
Cash
Flow Chart
 Graph
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