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Floating geodesic domes of concrete?

Home Forums Research Engineering Floating geodesic domes of concrete?


This topic contains 33 replies, has 15 voices, and was last updated by Profile photo of spark spark 2 years, 8 months ago.

Viewing 4 posts - 31 through 34 (of 34 total)
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  • #21443
    Profile photo of Anenome

    I think I’ve figured out a way to build large concrete half-spheres manufactured on the ocean itself. Eliminates the need for a dry-dock, but probably would require at least a water-based crane.

    Profile photo of Michael Hayes
    Michael Hayes

    Hi Folks,


    I’m new here and so I’ll briefly explain that I’m far more of a mechanic than an engineer. With that, I’ve believe the use of a Tensegrity sphere would be a better solution than going for a fully enclosed geodesic dome. Here is a Youtube vid on the structure: http://www.youtube.com/watch?feature=player_embedded&v=a7agYb_rZ6U#!


    This can be prototyped with PVC pipe and or HDPE dual wall culverts along with Spectra line. The main advantages this type of structure are:


    1) Wave energy conversion potential

    2) Ease of fabrication

    3) Scalable

    4) Versatile in use


    Let me know your thoughts


    Profile photo of Michael Hayes
    Michael Hayes

    Hi Folks,


    Sorry for the typos on that first post. Also, I probably need to explain, in greater detail, why I believe tensegrity structures are worth consideration.


    As a side note: I have a background as a commercial fisherman (winters on the Bering Sea long-lining) and thus I’ve lived on the ocean for extended periods of time…in extreme conditions. I, personally, would have no problem living aboard a tensegrity structure if it were properly designed, built and outfitted.

    Design Considerations that Favor Tensegrity Structures:

    1) Avoiding the need for large scale specially constructed jigs/forms/machining/yards/etc reduces the overall start-up and long-term cost.


    2) The standardization of the principal structural components further reduces cost.


    3) Breaking the design down to the smallest structural component allows for mass production/shipping/erection efficiencies.


    4) If each basic structural component is given an ability to adjust it’s buoyancy, a high degree of buoyancy redundancy and adjustment can be achieved. Potentially, this type of buoyancy control can be used as a form of propulsion as the controlled shift in buoyancy/weight would cause a structure to rotate.


    5) Designing the principal structural elements out of ‘off the shelf’ gear, to the greatest extent as possible, further reduces cost (no material/component R&D). I would recommend the use of 60″ dual walled HDPE culverts, as the main structural element, (which cost around $100 per linear ft.) and Spectra line as the tension element. A number of OTS gear can be engineered into this design.


    6) Tensegritic structures can be deployed for a number of oceanic uses. Here is an example of a tensegrity tube: http://www.youtube.com/watch?v=x_pZ-m6Ppyg which could be used as a transport tube between spheres/cubes/etc. or as a large scale fish pen.


    7) Customized internal structures/enclosures can be attached to the tensergrity structure to fit individual needs/desires.


    Final thoughts:


    The flexibility and simplicity of the tensergrity concept does seem to provide a means to erect and deploy large scale oceanic structures for the lowest cost per foot/meter. If a community were to adopt this type of construction as it’s ‘standard’ means of construction, it would create a way to ‘valuate’ the basic cost of construction for large/small scale expansion, as well as build in a deep degree of structural resource redundancy.


    I would like to find colaborators to help work up a design ‘package’ which would give an investor a clear view of the cost and potential profits. I have no experiance with developing a business plan or working up detailed engineering specs.











    Profile photo of spark

    How about ferrocement like that: http://www.youtube.com/watch?feature=player_detailpage&v=Vb1pdvvoVoQ


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