Acquista:
Il presente articolo tratta di un caso particolare di applicazione di un sistema di ventilazione trasversale per galleria e di come la scelta finale della soluzione progettuale proposta abbia influito sulle geometrie finali e sugli aspetti realizzativi della galleria stessa, abbattendone i costi (preventivati) di realizzazione e determinando così l’aggiudicazione ed il commissioning dell’opera. Stiamo parlando del progetto della nuova superstrada S2, Tangenziale Sud di Varsavia, ed in particolare del Lotto A di 4,6 km da Pulawska a Przyczółkowa che comprende una galleria a doppio fornice di circa 2.4 km. La gara, indetta dal committente GDDKiA (Direzione Generale per le Strade Nazionali ed Autostrade) si è svolta in forma di procedura ristretta ed ha visto l’aggiudicazione finale del contratto da parte di Astaldi S.p.A.. In sede di gara, ai vari Competitor veniva richiesta la formulazione di un’offerta economica che comprendesse la realizzazione dell’opera secondo una propria proposta progettuale rispondente in toto ai requisiti del capitolato prestazionale.
Practical case for the transversal ventilation applied to
unidirectional roadway tunnels - the case of S2 tunnel in
Warsaw
This paper concerns a practical case of
transversal ventilation system applied in a
road tunnel and how the approved final design
has an impact on the final geometry of
the tunnel, reducing the estimated implementation
costs and thereby promoting the
award of the Contract with the subsequent
realization of the works.
The ventilation system described is related to the twin-tube tunnel (2.4 km long) located
on the new roadway S2 -Southern
Bypass in Warsaw – Task A. The entire road
is 4.6 Km long.
The Tender procedure, issued by GDDKiA
(General Directorate for National Roads
and Motorways) was held as “restricted
procedure” with a formulation of an economic
offer in order to ensure the full compliance
of the performances described in
the tender specifications.
It is then described the starting assumption
about the performance of the ventilation
system, the draft presented by the Contracting
Authority during the tender phase and
the optimization proposals, these last ones
as results of the analysis of the required
performances, the current local legislation,
the technical regulations and the specific
characteristics of the works to be realized.
Furthermore, It has been demonstrated the
applicability and effectiveness of the Computational
Fluid Dynamics (CFD) and the
Fire Safety Engineering for the validation of
the transversal ventilation system in a road
tunnel with unidirectional traffic.
Inside the tunnel the ventilation system is
therefore able to make a correct control
of events in case of fire (by far the most
dangerous condition) as well as operating
and managing a proper dilution of the pollutants
for sanitary ventilation.
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