Details
Beam Bridge
Executive plan
Location
SS 199 “Monti” – from 61+600 km to 68+600 km
Olbia – SS
Principal
ANAS S.p.A
Contracting company
Oberosler cav. Pietro S.p.a.
Team
Matildi+Partners srl
Activities
Executive plan (scaffolding)
Time Period
2014 – 2016
Extent and spans
210 m
42.10 + 42.70 + 42.70 + 42.70 + 42.10
The new deck and slab
The new deck and slab
These works are part of the overall plan for the upgrading of the Sassari Olbia Route Lot 7, located at 68+017 km.
The new deck is a continuous composite steel-concrete system truss with a 5-span twin-beam layout of spans 42.1 + 42.7 + 42.7 + 42.7 + 41.2 m and a rectilinear layout.
The concrete slab accommodates the road platform with a total width of 16.07 m and 16.77 m, for the north and south carriageways respectively; it is frame worked on the main beams, placed at a centre distance of 11.60 m, and on the intermediate pin beam. The slab is cast on self-supporting concrete predalles with a thickness of 6 cm, until a total thickness of 30 cm is reached after additional casting.
Deck structure and assembly
Deck structure and assembly
The beams vary in height from a minimum of 2.20 m at the span to a maximum of 5.10 m at the pier and are connected by cross beams with a double-T section placed at a maximum centre distance of 6.5 m, as well as by an upper bracing with a St. Andrew’s cross pattern.
The diaphragms on the abutments work together with the slab by means of dowelling; this works together to stiffen the slab at the structural break with the gravel guard, greatly limiting differential vertical deformations between the guard and the slab due to the transit of vehicles over the junction.
Assembly of the deck is carried out by lifting the individual beams from below with the aid of a crane truck, after assembly of the segments on the ground.
Photo gallery
A visual narrative depicting our rigorous work on the design, construction and testing of the infrastructure as a new roadway serving the entire community.
