Civil Engineering Case Studies

 

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In June major work began on an ambitious project to transform boating through Limerick. A new weir from Sarsfield Lock across to Curragour Point, as well as other improvements, will mean that for the first time, boats will be able to moor in central Limerick and to negotiate the stretch to Killaloe via the Abbey River with considerable ease.

"The Millennium Dome, the largest single covered space in Britain, has a diameter of 320m, a floor area of 90,000msq, and a height at its The Millennium Dome centre of 50m.

The dome is a shell and core structure able to accommodate event and exhibition structures, up to 40m high. In reality, the 'Dome' is an enormous stressed cable net structure, with a clear span of some 200m.

The primary structure is a series of 72 radial stringer cables each made up of pairs of 32mm diameter steel spiral strand. The stringers are supported, at a radial spacing of between 25 and 30m, by a network of upper hanger and lower tie-down cables arranged around twelve 100m primary lattice steelwork masts. Circumferential cables keep the stringers on their radial lines and the network rigging supports the roof membrane."

In 1940, the Tacoma Narrows Bridge began undulating wildly and eventually self destructed in a 40 mph wind, just 1 yr after its completion.

This led to changes in bridge construction ever after.

The Channel Tunnel linking the UK with mainland Europe was a great geotechnical engineering achievement. The tunnel consists of 3 interconnected tubes: 1 rail track each way plus 1 service tunnel. It is 50 kilometres long with an average depth of 45 metres below the seabed. The channel crossing time is only 20 minutes.