Mario Paolo Petrangeli - ..: AIPSS - Associazione Italiana ... · Mario P. Petrangeli Mario Paolo Petrangeli 2 ... The central part of the arch supports directly the road ... Mario

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Mario Paolo Petrangeli

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The Roman Bridges

Mario P. Petrangeli


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The importance of the bridges at roman time: (i) to facilitate the troop movements

The right abutment still in place

The bridge (21 wooden arches spanning 51 m each) built by Traiano (53-117 AC) to cross the Danube and conquer the Dacia ( the Balcan area)

Credits: several images come from "Vittorio Galliazzo “I Ponti Romani”http://www.traianvs.net/pdfs/2004_01_galliazzo.pdf

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The importance of the bridges at roman time: (ii) to cross deep valleys with aqueducts

Tarragona (11+25 arches) Segovia (119 arches )


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Bridge of ships

Marco Varrone ( 116-27 BC) planned to cross the Adriatic sea from Otranto to Apollonia (Albania) (about 50 km)

Caligola ( 1° century AC ) built a bridge of ships about 5000 m long crossing the sea from Baia to Pozzuoli (Naples).


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Wooden bridges


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A modern italian railway bridge


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Wooden trestle bridge, 400m long,

crossing the Rhine river

built by Caesar (55 BC) in 10 days

Pontes tumultuarii (Temporary bridges)


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Pontes longi ( Long Bridges )

To cross marshes or very soft soils


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1 The main arch

2 Secondary arch

3 Lateral retaining wall

4 Pier

5 Foundation


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Pile-drivers


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Foundations


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Water-scooping machines


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Ponte Cestio

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Scheme of the original single arch CESTIO bdg foundations

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Ponte Emilio


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Piers shape

Upstream face: mainly with cutwater, sometime circular Downstream face: circular or plane


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Type of walls: grande apparecchio (large dimension blocks )

Arcaic polygonal work

“Third generation” polygonal work

Square units work



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A Roman bridge widened and still in service for a national road (Tiburtina)


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Opus reticolatum Opus incertum

Type of walls: piccolo apparecchio (small dimension blocks )


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Opus vittatum Opus mixtum

Type of walls: piccolo apparecchio (small dimension blocks )


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Different types of arch


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One of the oldest example of Etrurian Bridge (Ponte Camillario ) near Viterbo


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Alcàntara Spain- 103-104 A.C.


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Salamanca


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Alconétar


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A modern version of an ancient shape

The central part of the arch supports directly the road


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Details to handle and to connect stone blocks


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Types of centreing


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Ponti Fabricio e Cestio on the back; the ruins of

ponte Emilio on the left

Ponte Fabricio


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Ponte S. Angelo


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Ponte S. Angelo


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THANK YOU FOR YOUR KIND ATTENTION

A fascinating history lasting more than two thousands years

Ponte Fabricio

Ponte sul PO


Mario Paolo Petrangeli - ..: AIPSS - Associazione Italiana ... · Mario P. Petrangeli Mario Paolo Petrangeli 2 ... The central part of the arch supports directly the road ... Mario

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