Realization of a new footbridge on the river Entella in the village “Graveglia”, in the municipality of Carasco.

The walkway, through-bridge, consists of two lattice girders, made of tubular sections. The static scheme is that of a continuous beam on 2 spans of 40 m each.

The access ramps to the bridge have a steel structure. In the feasibility study phase, a single span solution of 80 m with a single arch was also evaluated.

The works are part of the project to build a five kilometer (5k) elevated walkway around London’s Greenwich Peninsula. The elevated path is made up of several “islands” (1, 1A, 2, 3, 4, 5 and 5A), connected to each other by pedestrian walkways.

Most of the structures are steel and painted structures. They present an aesthetic with extremely innovative forms and their design required a particular study with regard to the fittings, which are not in view.
The core, the foundation slabs and the pier caps are made of reinforced concrete (RC).

The project involves the construction of a single-support metal footbridge with a span of 31.2m. The deck of this through-bridge consists of two vaulted main beams with a symmetrical welded I-section are 1.5 m high and equipped with transverse stiffeners with a T section in correspondence with the sleepers. The double T crosspieces are connected to the main beam by endplate joints. Since there is no concrete slab, an adequate bracing system had to be provided.
The walking surface consists of wooden elements resting on metal beams with omega-sections connected to the crosspieces.
The abutments are of the traditional type with cast-in-place reinforced concrete elements, consisting of a front wall, side walls statically independent of the abutment itself and mat foundation.

This through-bridge walkway has a static scheme of a continuous beam with 6 spans plus an isostatic edge span, connected to the previous ones by means of a link by axis in order to avoid tension on supports.
The walkway has a total length of approximately 198.5 [m] and a width of 6.9 m with the last span having a widening of approximately 10 m. The implantation axis is partly curved (circular, radius 64.7 [m]) and partly clothoid.
The beams are welded and have a height of 1.5 m.

The gantries are positioned on the beams using rectangular tubular sections, placed at the same center distance as the diaphragms. The side walls of the gates are covered with perforated sheet metal, while the bottom of the box is covered with an envelope of metal panels for aesthetic reasons.

The deck is made with a pair of lateral beams, supported by hangers attached to the arch and converging towards the centre. The main beams of the deck, with a C-section recomposed by welding, are connected to each other by metal crosspieces with an I-section of variable height at a distance of 2m.

The hangers are made by cables 20 mm diameter) connected to the deck by fixed clevises at the bow and adjustable clevises at the apron. The deck is completed by pouring concrete on ribbed sheet metal 12cm high with longitudinal garbage.
The main geometric characteristics are as follows
• Range: approximately 72 m
• Height of the arch: approximately 15 m
• Useful width: 3.5 m