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Invitation to tender: New "Millau - Meouw" bridge (Sir Norman Foster welcome)...

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Invitation to tender: New "Millau - Meouw" bridge (Sir Norman Foster welcome)...

Old 26th May 2014, 16:51
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Uneasy Pleistocene Leftover
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Invitation to tender: New "Millau - Meouw" bridge (Sir Norman Foster welcome)...

Please submit your official tenders and/or advice concerning replacement of existing bridge with more modern and light-weight version:

Existing bridge specifications:

Dimensions: Overall length (single span, unsuspended) = 4,240mm; width = 60mm; single-lane for pudicats approx. weight 4-7kg.

Construction: Hard wood, using 60x40mm timbers with single over-lapping junction of approx. 40cm at mid-length. All secured by stainless steel 316 wood screws. Additional "non-slip" surfacing to "traffic" surface using woodsaw in "X" pattern every 25mm approx. "Stabilisers" approx. 25cm width using 60x40mm timber fitted at each extremity.

Comments: This rudimentary bridge has provided extremely satisfactory service for regular use by pudicats between 1991 and approx. 2010. However, more recent pudicats do not like using it because of A) Limited width of 60mm only. B) Important flexing and creaking noises.

---XXX---

NEW bridge specifications:

Dimensions: Overall length (single span, unsuspended) = 4,240mm; width = 100-120mm minimum; single-lane for pudicats approx. weight 4-7kg.

Construction: Hard wood, aluminium, composites etc. all acceptable (I can supply the "non-skid" surface covering).

Site limitations etc.: 1) Max. length for transport of materials onto site 2,500mm. 2) Assembly on site: no welding facilities, assembly should consist of either adhesives and/or bolts, nuts and washers.

Max. cost (excluding assembly): EUR 50-75.

PS. What is it with pudicats ca. 2014 that they can't / won't use a 60mm wide creaking bridge to come and eat or just "have a wander"...?!

PPS. This is especially for "Mummy cat".
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Old 26th May 2014, 19:33
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Oh FFS, it's a simple bridge, to connect my 1st floor balcony across to the high wall approx. 420cm away, across which pudicats might traverse safely...?!

Someone...?!
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Old 26th May 2014, 19:36
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To assist the tendering process, a photo of the existing structure would be an aid to some I think
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Old 26th May 2014, 19:53
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If it doesn't involve welding or at least Wrought iron and hot rivets, It's a plank not a bridge!

At least according to the I K boys book of engineering anyway!
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Old 26th May 2014, 19:58
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Construction: Hard wood, using 60x40mm timbers with single over-lapping junction of approx. 40cm at mid-length.
west lakes, try to imagine that. Admittedly, I don't have any photo available because that would oblige me to have an account with one of the usual "hosts" who store such photos without any recompense. And why I cannot.

I'm just wondering if say, 2 sections of 150mm width x 20mm thick hard-wood, each approx. 2.5m long, joined by a simple aluminium "T" profile at the mid-section (for 50cm or even longer) would suffice...?!

Bleedin 'eck. It's all I came here for, before I was drawn by the other threads...?!
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Old 26th May 2014, 20:05
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Cat-apult???

Thank-you, thank-you, you're very kind....
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Old 26th May 2014, 20:08
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Airship

":Admittedly, I don't have any photo available because that would oblige me to have an account with one of the usual "hosts" who store such photos without any recompense. And why I cannot."


Try using www tinypic com (add a . in the spaces !)


You don't need to sign up to it to use it and it is very quick and easy.
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Old 26th May 2014, 20:18
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Airship

First idea

Make a T Bar out of wood.
Get 2 x 2,500mm lengths of wood and use these vertically.
Get 2 x 2,500mm lengths of wood and use these nailed to the two above.
I think it should span 4 metres.


2nd idea
Get two 2,500mm square metal pipe and bolt them together to span the 4.2 metre gap. Then bolt some wood to them for the putty cat to walk on.
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Old 26th May 2014, 20:30
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I'm just wondering if say, 2 sections of 150mm width x 20mm thick hard-wood, each approx. 2.5m long, joined by a simple aluminium "T" profile at the mid-section (for 50cm or even longer) would suffice...?!
The two pieces of 150 x 20 sound fine, then get some 50 x 50 timber, overlap on the joint by a fair amount either side say at least 1m top and an overlapped piece of 150 x 20 on the bottom as you have now.
You could actually run the 50 x 50 the full length as a sort of edge rail it would also serve to remove a lot of the bounce from the structure. If you did this get 2.5 m lengths similar to the 150x50 which would increase the overlap (think brick wall)
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Old 26th May 2014, 20:40
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Buy a length of plastic sewer pipe of diameter greater than fully preggers Mummy cat.

Pipe is probably sold in 5m length.
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Old 26th May 2014, 20:54
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A 'composite' - several lengths of whatever material you choose 2.5 metres long, but instead of butt-jointing in the middle of the span, stagger the joints (with at least one 2.5 metre length in the middle of the span with overlapping joints at either end of the 2.5 metre central section).
Join with adhesive or bolts to suit your material.

You could even extend the structure beyond the ends of the 'gap' (over the wall as a cantilever).
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Old 26th May 2014, 22:34
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Thinking about it and remembering what one of the guys at Old Sarum said about the Hanger that the Boscome Down collection is in How about a Belfast Truss? Apparently first world war hangers were made using this technique as it meant they didn't have to use long lengths of timber.

I couldn't find a decent picture of the Old Sarum trusses but here's a link to Barton aerodrome with a drawing of the truss.
BARTON AIRPORT
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Old 27th May 2014, 00:57
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each approx. 2.5m long, joined by a simple aluminium "T" profile at the mid-section (for 50cm or even longer) would suffice...?!
I was thinking of aluminium angle running the length of both sides...?



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Old 27th May 2014, 01:07
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Put your cats on a diet and they won't need their bridge doubled in width. Obesity is a global problem. We already have way too many fat-cats.
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Old 27th May 2014, 03:20
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Old 27th May 2014, 07:02
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Think outside the box.

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Old 27th May 2014, 07:09
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I believe the procurement team at the MOD could have this sorted within about six years with an initial cost of 400,000 rising to just under 12,000,000 though you would have to factor in the obvious fact that it would never actually be delivered due to cancellation by the government just prior to delivery.Perhaps better to go to B&Q and get those three planks of wood.
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Old 27th May 2014, 07:23
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Think laterally. A different way to solve ploblem.
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Old 27th May 2014, 08:26
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Mmmmmm!! Cat!! .... the other white meat! ...
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Old 27th May 2014, 09:11
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I don't eat pussy.





...unless it smells of fish.
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