Roman bridges

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Roman Roads
* Our presentation is on the Roman Roads.
* We will explain the methods use to build the roads and for what purpose.

Agenda
* Identify the need for roads
* Explainthe methods that were adopted by the Romans in constructing roads
* Identify the materials used in the construction of the major Roman highways
* Comparison of Roman road system versus our ownroad system

Problem
* The problem for the Romans was as moving equipment such as catapults faster from point A to point B.
* The need for better defense, along with a desire for expansion.
* These roads allowed a faster and easier movement of goods and traders, as well as the rapid transfer of troops.

Design
* In Rocky stable areas only one layer
of cobble stone was used* In soft unstable areas a fosa was made
and filled with gravel, cobble stone and
rubble held together by sandy soil or lime mortar
* Pavement thickness ranged from 25cm to 150 cmdepending on the area
* Grade of pavement: 1-2 % on flat ground 16-18% on mountain
* The pavement had a convex dropped from 5% to 10% for drainage purposes
* Large rocks were placed to preventlateral spreading
* Large rocks placed in the middle to separate opposing traffic
* A road in Ribchester, England this road branches of the “Course of Roman Road”
* Is a road from pastRoman origin that has been updated to be used effectively used by motor vehicles
* Has a smooth surface to facilitate ease of access

Materials
* Cobble stone
* Gravel
* Rubble
*Large local stones
* Sandy clay
* Flint stones
* Chalk

Method of construction
* A hole was dug in order to fill it in with 4 to 5 more layers, depending on the soil, to strengthenthe structure
* The roads were slanted up to 10% to facilitate water draining; therefore, avoiding damage to the roads
* Use of a drainage system
called a fossa
* Built a meter or more...
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