N15class Posted March 30, 2012 Share Posted March 30, 2012 This is going to be some impressive structure. Is it all from plastic card? Link to post Share on other sites More sharing options...
Ron Heggs Posted March 30, 2012 Author Share Posted March 30, 2012 This is going to be some impressive structure. Is it all from plastic card? Hi, Peter As with all my other structures it will be a completely plastic card/strip build Cheers Ron Link to post Share on other sites More sharing options...
scanman Posted March 30, 2012 Share Posted March 30, 2012 Ron, I cannot recall another example of a modeller designing & building his own test equipment from plastikard! I hope you enjoyed the cider afterward! Regs Ian Link to post Share on other sites More sharing options...
Ron Heggs Posted March 31, 2012 Author Share Posted March 31, 2012 Ron, I cannot recall another example of a modeller designing & building his own test equipment from plastikard! I hope you enjoyed the cider afterward! Regs Ian Hi, Ian Thanks for your comments - I enjoy cider at any time (pity I can't get Scrumpy here in Spain) As the structure is an all-styrene build the test apparatus and test sample had to be styrene - although the test load was inevitably going to be cans of an alcoholic beverage (known mass, easy to fix or stack, and enjoyable refreshment) Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted March 31, 2012 Author Share Posted March 31, 2012 Construction of the lower arch has started - The outer members being 3.2mm Channel facing inward joined internally by a 20thou x 9mm wide strip - making up the 10mm overall width. The end outer plating is 20thou plasticard The board is 6mm ply and the pins are 25mm galvanised (that is the reason for the pin hammer) The pins are there only to keep the assembly in place whilst the plasticweld joints set. The plastic strips are pre-curved by finger & thumb and left for a few minutes to ensure any stresses settle out, and won't cause any future warping of the structure - more later tonight Link to post Share on other sites More sharing options...
Katier Posted March 31, 2012 Share Posted March 31, 2012 Something tells me you've knocked the odd bottle of solvent over in your time Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted March 31, 2012 Author Share Posted March 31, 2012 Something tells me you've knocked the odd bottle of solvent over in your time Ron So far just three bottles out of 32 Link to post Share on other sites More sharing options...
Ron Heggs Posted March 31, 2012 Author Share Posted March 31, 2012 Tie braces between top and bottom arch members fitted to one side only - Small cross-braces being fitted to top of lower part of arch - Link to post Share on other sites More sharing options...
Ron Heggs Posted March 31, 2012 Author Share Posted March 31, 2012 Photo of the bridge showing the scope of the structure and bracings, etc. - Link to post Share on other sites More sharing options...
ColinW Posted April 1, 2012 Share Posted April 1, 2012 Hi Ron, Was wondering why nothing had been put onto your Manchester Central & Castlefields Viaducts thread recently, then I see you doing this one. Looks like you have made a good start (no surprise there) and will keep an eye on it as it progresses. Colin Link to post Share on other sites More sharing options...
Ron Heggs Posted April 1, 2012 Author Share Posted April 1, 2012 Hi Ron, Was wondering why nothing had been put onto your Manchester Central & Castlefields Viaducts thread recently, then I see you doing this one. Looks like you have made a good start (no surprise there) and will keep an eye on it as it progresses. Colin Hi, Colin I see you found my latest project Still making the 119 transverse beams for the Train Shed roof - No point in posting pictures of these until the last 7 bays are being put together with the completed spans Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted April 3, 2012 Author Share Posted April 3, 2012 Pictures to show progress - just half the arch completed - Fixing the bracings inside the channels was a challenge - until I started using a scrap of 40thou plastic strip to support the brace whilst placing and fixing it Link to post Share on other sites More sharing options...
Ron Heggs Posted April 8, 2012 Author Share Posted April 8, 2012 - latest photos of progress - The lower arch cross-bracings completed - (with a few transverse beams for Manchester Central Train Shed roof being constructed simultaneously) The upper arch plating being fitted - - the opposing side braces are next Link to post Share on other sites More sharing options...
Ron Heggs Posted April 9, 2012 Author Share Posted April 9, 2012 Hi, Peter Thanks for your continuing interest, and hope you continue to like this build Cheers Ron Link to post Share on other sites More sharing options...
N15class Posted April 10, 2012 Share Posted April 10, 2012 It is very interesting. You are doing things that I had not thought about doing in plasticard. But it gives me ideas for when I do my layout. Link to post Share on other sites More sharing options...
Ragtag Posted April 10, 2012 Share Posted April 10, 2012 Cracking job so far. Watching with interest as I know the prototype well. Link to post Share on other sites More sharing options...
RMweb Gold Stubby47 Posted April 10, 2012 RMweb Gold Share Posted April 10, 2012 Photo of the bridge showing the scope of the structure and bracings, etc. - What's quite surprising about this bridge is although the arches are quite substantial, the vertical pieces on which the bridge deck hangs appear to be quite flimsey. Is there any structure under the deck to aid the support ? Link to post Share on other sites More sharing options...
Fat Controller Posted April 10, 2012 Share Posted April 10, 2012 What's quite surprising about this bridge is although the arches are quite substantial, the vertical pieces on which the bridge deck hangs appear to be quite flimsey. Is there any structure under the deck to aid the support ? There is only a simple deck, IIRC .The arched structure needs to be pretty substantial, as it carries the load from all the vertical supports. Each vertical support, however, carries only a small part of the total weight of the deck. Link to post Share on other sites More sharing options...
Ron Heggs Posted April 10, 2012 Author Share Posted April 10, 2012 Thanks Brian for answering Stubby for me You are quite right - the bridge has 48 deck support hangers. Three (one from each of the three arches) for each of 16 deck support beams. There are also 4 deck beams, two at each end which are supported directly by the arch If we assume that the train loadings are 500 tons on both tracks simultaneously i.e. 1000 tons, then each of the support beams must carry 50 tons plus a portion of the deck weight, and hence each hanger must carry 16.7+ tons. Each hanger is approx. 150mm x 25mm cross-section which would have a maximum aged load limit in excess of 150 tons. That is quite an important safety factor Cheers Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted April 10, 2012 Author Share Posted April 10, 2012 Last night's progress - - now it's the diagonal cross bracings with integral bracings - a few pencil markings for the bracings attachment points Link to post Share on other sites More sharing options...
Ron Heggs Posted April 10, 2012 Author Share Posted April 10, 2012 The first set of Cross-bracings fixed in place, at the crown of the arch - The four bracings, two T section and two Flat section - The two external braces have only two cross-braces, and the two internal braces have four cross-braces at the higher levels of the arch and five at the lower levels - - now for the remaining 35 pairs Link to post Share on other sites More sharing options...
RMweb Gold Oldddudders Posted April 10, 2012 RMweb Gold Share Posted April 10, 2012 As others have suggested, this is surreal. Use of a common modelling material as an engineering medium. Progress is prodigious, too - but then as Ron's own link suggests this is in the 2010 Scratchbuilding Challenge, rather than 2012, he may be trying to make up for lost time! Link to post Share on other sites More sharing options...
Ron Heggs Posted April 10, 2012 Author Share Posted April 10, 2012 As others have suggested, this is surreal. Use of a common modelling material as an engineering medium. Progress is prodigious, too - but then as Ron's own link suggests this is in the 2010 Scratchbuilding Challenge, rather than 2012, he may be trying to make up for lost time! Thanks for the 'correction' to my signature Definitely, always trying to make up for lost modelling time Cheers Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted April 10, 2012 Author Share Posted April 10, 2012 Little more progress - Link to post Share on other sites More sharing options...
Ron Heggs Posted April 14, 2012 Author Share Posted April 14, 2012 Couple of pictures - Note: The cross-braces are constructed using the jig - two rectangular cut-outs - to ensure they are all identical and fit exactly between the the main braces View with another six external braces fitted - - matching internal braces next Link to post Share on other sites More sharing options...
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