Model Bridges for the Garden Railway

Photo 3 Grockle Creek Pony Truss copy
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Plate Girder  ELM TREE RED3

Inverted 'Deck' Bowstring Girder Bridge (IBS)

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IBS100 Inverted Bowstring 1000 mm without parapets

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This is another highly attractive design to include in your railway. Simply an inverted version of the upright bowstring it can be used with an open deck but it will be greatly enhanced with the addition of a parapet rail at an additional cost. It is certain to add interest to your line and will be a feature that all visiting engines will use for a photo stop. Examples of this and its counterpart, the upright bowstring bridge, can still be seen along the line of the Penrith, Keswick and Cockermouth Railway. (see below). Although a standard gauge branchline, the track crossed the River Greta eight times using both upright and inverted examples of bowstring bridges. Originally built as straightforward bowstrings they were later strengthened by the addition of plate girders under the deck between the bowstring structures. Our design is purely a bowstring structure however we employ the truss arrangement of vertical and diagonal members rather than crossed diagonal bracing. The side structures consist of an arched beam, maximum height 100mm (BS100) at the centre sloping downwards section by section to each end. Vertical and diagonal members support the beam. All sections are of 12mm x 12mm aluminium square section connected by 1.5mm plates rivetted with 2.4 mm blind rivets. The main deck and side structures are supported on sturdy 25mm x 25mm 'T' section beams. Strong 3mm plate feet are provided to give the bridge a firm foundation.. INVERTED BOWSTRING GIRDER BRIDGES (IBS)    Without parapet rails With parapet rails IBS75: 750mm span £132.00     £172.00 IBS100: 1000mm span £170.00     £210.00 IBS125: 1250mm span £209.00    £249.00 IBS150: 1500mm span £253.00    £293.00 plus p&p

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IBS100 Inverted Bowstring 1000 mm with parapets

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greta deck bowstring

Copyright Ian Capper and licensed for reuse under this Creative Commons Licence

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