Static structures (e.g. – buildings) – Conical or radially ribbed cover
Patent
1981-09-10
1984-06-12
Raduazo, Henry E.
Static structures (e.g., buildings)
Conical or radially ribbed cover
52192, 52245, E04H 700
Patent
active
044533519
DESCRIPTION:
BRIEF SUMMARY
Field of the Invention
This invention relates to an enclosed structure and has been devised particularly, though not solely, as a grain silo.
Background Art
Most silos and containers or storage bins for large amounts of particulate solids, are made from reinforced concrete or heavy steel plate. Such constructions require skilled engineering and manpower to erect. They are also very costly to build.
Summary of the Invention
It is desirable to provide an enclosed structure which may be used as a grain silo and which is simple and cheap to construct to enable grain to be simply and cheaply stored at a desired location.
It is therefore an object of the present invention to provide an enclosed structure which will go at least part of the way towards meeting the foregoing desiderata in a simple yet effective manner, or which will at least provide the public with a useful choice.
Accordingly, in one aspect the invention may broadly be said to consist in an enclosed structure suitable for containing particulate solids characterized by a plurality of posts set on foundations so as to define the line of a cornerless wall, a plurality of rafters extending upwardly and inwardly from each said post to a central point or ridge, a plurality of circumferential girts extending substantially horizontally between said posts along the line of said wall, sheet wall cladding extending the height of said wall fastened to said girts, the vertical edges of the adjoining sheets of cladding being secured together in a structural manner, and roof cladding placed over said rafters form a roof.
Preferably, the cladding is of corrugated or ribbed cross-section sheet metal, although many non-metallic materials would also be suitable.
This mode of construction utilises girts to carry the majority of the stresses imposed by the particulate solids contained therein. The internal cladding does not carry high loadings over large spans as the girts are placed sufficiently close together to spread the load. Thus the thickness of the sheet cladding used is very much reduced from that used in conventional silos.
The girts are preferably angle or T-section steel members spaced at suitable distances generally from 100 mm to 900 mm. The girts are attached to the posts and the internal cladding attached to the girts. The joins of adjacent sheets of cladding are preferably sealed with a flexible sealing compound.
The sheets of cladding are preferably oriented with their ribs or corrugations disposed in the vertical direction.
The technique of building a silo in accordance with the invention enables silos capable of holding up to 35,000 kg to be readily constructed. As the silo is filled there is slight expansion of the walls. This expansion creates a significant problem if the bottom edge of the cladding is merely directly secured to the foundations as it will be sheered open or will crack after a number of loadings.
To overcome this problem the invention provides a lower circumferential wall of heavier gauge sheet steel secured at its lower end to the foundations and at its upper end to the sheet metal cladding. There is no need, in general, to have girts around this lower wall if it is made of sufficiently thick metal. Thus when the silo is loaded the upper end of the lower wall can expand with the sheet metal cladding, whilst the lower end remains fixed. The lower wall is preferably about two meters high although obviously it could range from 1 meter to, say, 4 meters depending on the size of the silo being constructed.
The lower wall is preferably formed from a series of plates which are joined along their vertical intersection.
In order to construct silos in accordance with this invention a very simple procedure is followed.
The floor and foundations of the silo are prepared. The floor will generally include one or more conveyor or screw type solids removal units therein. The posts are erected by a crane and secured to the foundations, by say four bolts. The posts will generally define a circular area. The girts are attached to the inside
REFERENCES:
patent: 1073871 (1913-09-01), Stillman
patent: 2323297 (1943-07-01), Collins
patent: 2955686 (1960-10-01), Blomeley
patent: 2983340 (1961-05-01), Zittle
patent: 4227353 (1980-10-01), Lewis
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