{"id":19687,"date":"2015-05-05T14:20:14","date_gmt":"2015-05-05T14:20:14","guid":{"rendered":"http:\/\/www.newsteelconstruction.com\/wp\/?p=19687"},"modified":"2015-05-05T14:20:14","modified_gmt":"2015-05-05T14:20:14","slug":"steelwork-takes-a-bow-at-irish-venue","status":"publish","type":"post","link":"https:\/\/www.newsteelconstruction.com\/wp\/steelwork-takes-a-bow-at-irish-venue\/","title":{"rendered":"Steelwork takes a bow at Irish venue"},"content":{"rendered":"
\"How<\/a>

How the completed venue will look<\/p><\/div>\n

A steel-framed extension to the Belfast Waterfront conference and entertainment venue is the biggest single project in the city\u2019s \u00a3150M investment programme. Martin Cooper reports.<\/h4>\n

FACT FILE<\/strong>
\nBelfast Waterfront extension<\/strong>
\nMain client:<\/strong> Belfast City Council
\nArchitect:<\/strong> Todd Architects
\nMain contractor:<\/strong> McLaughlin & Harvey
\nStructural engineer:<\/strong> Doran Consulting
\nSteelwork contractor:<\/strong> Walter Watson
\nSteel tonnage:<\/strong> 1,200t<\/span>The \u00a329.5M extension to the Belfast Waterfront, Northern Ireland\u2019s only purpose-built conference centre, will double its existing conference, exhibition and entertainment space, which in turn will help to attract more international events and act as a catalyst for further economic growth.<\/p>\n

The steel-framed<\/a> extension links into the original concrete-framed Waterfront but the new build is a fully independent structure gaining stability<\/a> from its own braced cores<\/a>.<\/p>\n

The extension is constructed over the existing service yard between the Waterfront Hall and the adjacent Hilton Hotel, and also extends outwards along the River Lagan embankment.<\/p>\n

Inside the extension there will be 4,000m\u00b2 of conference, exhibition and banqueting space. This will consist of two exhibition and conference spaces, hall 1 incorporating halls A, B, C and D, that can be used as one large 1,850m\u00b2 area, or sub-divided via retractable walls into four smaller spaces. Likewise the smaller hall 2 can also be divided into two separate halls, A and B, or used as one 702m\u00b2 exhibition and conference area.<\/p>\n

Elsewhere there are a number of flexible breakout meeting rooms, many of which can also be divided into numerous smaller configurations. The extension also includes a fully fitted-out commercial kitchen to cater for up to a 750 person banquet, plant and back-of-house zones, circulation routes and a new feature riverside entrance and foyer.<\/p>\n

\"Z-shaped<\/a>

Z-shaped bracing is lifted into place<\/p><\/div>\n

\"A<\/a>

A temporary column supports a feature 9m cantilever and will be removed later in the programme<\/p><\/div>\n

Main contractor McLaughlin & Harvey started work onsite last September and in 86 weeks the project will be complete with the first events pencilled in for May 2016.<\/p>\n

\u201cThis is a very fast-track programme mainly due to our funding obligations,\u201d explains Belfast City Council Project Manager Kieran Mooney.<\/p>\n

\u201cNearly half of the project\u2019s funding is coming from the European Regional Development Fund (ERDF) and it stipulates that the money must be spent during 2015 and so the project will be complete by 31 December.\u201d<\/p>\n

No pressure then on the construction team! To their credit the scheme is on schedule despite a whole host of challenges that have had to be overcome.<\/p>\n

Enabling works and piling was predominantly completed last year, but not without a major service diversion scheme having to be undertaken first (see box).<\/p>\n

Walter Watson started its steel erection<\/a> programme in January and it is scheduled to complete this in June.<\/p>\n

\u201cThe main challenge for us is the coordination of the programme between ourselves and groundwork and envelope <\/a>works. Due to the restricted nature of the site the steelwork erection had to commence at one end of the site while groundworks continued on the remainder of the site,\u201d says Walter Watson Project Manager Trevor Irvine.<\/p>\n

This requires a high degree of co-ordination between the subcontractors to allow passage of plant and materials through the areas where excavations are ongoing and foundations are still under construction<\/a>.<\/p>\n

Further site restrictions arise due to the close proximity of both the Waterfront and the Hilton Hotel, with noise and vibration being kept to a minimum and continuously monitored.<\/p>\n

The initial steelwork erection was carried out over the existing Waterfront service yard that is situated adjacent to the Hilton and is not being used during the duration of the construction work.<\/p>\n

This area has the longest spans of the project, as the grid<\/a> is 23.5m \u00d7 6m in order to accommodate turning trucks once the service yard is back in operation.<\/p>\n

Spanning this ground floor area and supporting hall 1 A and B above is a series of plate girders<\/a> varying in depth from 1,500mm up to 1,800mm.<\/p>\n

The heaviest girder on the entire scheme is located here and it weighs 21.7t. This 19m-long section has connection plates that have a combined weight of 3t and required 70 bolts.<\/p>\n

\u201cThe long spans required over the service yard, and the need to absorb big floor loadings<\/a> and high frequency vibration<\/a> from the hall above, meant stiff steel plate girders were the only option,\u201d explains Doran Consulting Project Engineer Andrew Gardiner.<\/p>\n

Forming the roof of the expo halls is a series of 23.5m-long tapered Westok rafters and secondary beams erected on a 3m \u00d7 3m grid.<\/p>\n

The stiffness of the steel frame is very important, not just here but also in the extension\u2019s other halls. The floors have to be able to absorb 10kN per m\u00b2, while the roof steelwork will have to support rigging and exhibits weighing up to one tonne apiece.<\/p>\n

Due to the project\u2019s phased programme Walter Watson has also started erecting the eastern corner of the extension, overlooking the river.<\/p>\n

On this part of the steel frame there are a number of large cantilever trusses<\/a>, 1,250m deep and cantilevering out to a maximum length of 9m to form a feature element of the structure.<\/p>\n

\u201cWith steel erection<\/a> gangs working simultaneously, they will eventually meet up in the middle of the site. In this way we can keep the site accessible for our many other ongoing works,\u201d sums Mr Donnelly.<\/p>\n

<\/div>\n