Kafr Shukr Eco-Bridge Design

摘要

The paper discusses a countryside eco-bridge designed to serve pedestrians and cattle in Kafr Shukr,rnwhich is a small village situated 80 kilometers away from Cairo. The daily rural activities of thisrnvillage are split by a highway and an irrigation canal. As many other local villages, such situationrnforced the local farmers to risk crossing the road walking, after crossing the canal by ferries.rnThe bridge is composed of the following main elements:rna) Two reinforced concrete ramps.rnb) Three concrete staircases for pedestrians use.rnc) Steel girder bridge.rnThis bridge is accessed by 2 concrete staircases and 2 ramps. At the side of the canal, the ramp isrnonly 35m long, while the ramp at the opposite side is 95m long. The concrete ramps are sloped inrnthe longitudinal direction by 1:15 or 6.65°, which can be considered acceptable, and hence suitablernfor the hardly predictable motion of cows whether single or grouped. A horizontal landing of fewrnmeters long is provided every 20 to 30m to enable the cattle to rest during their ascending orrndescending. The semi circular cross section of the ramps consists of 2 beams of 65cm width eachrnand a height of 40cm, 15cm slab thick in between and an overlay fills of 25cm thick made of a softrnwalking surface suitable for animals. Two curved uprights of 120cm and 10cm thick are used asrnparapets.