GREENHOUSE TYPE BASED ON CONSTRUCTION

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The type of construction is predominantly influenced by the structural material, though the covering material also influences the type. Span of the house inurn dictates the selection of structural members and their construction. Higher the span, stronger should be the material and more structural members are used to make sturdy truss type frames. For smaller spans, simpler designs like hoops can be followed.  Therefore based on construction, greenhouses can be broadly classified as wooden framed, pipe framed and truss framed structures.

Wooden framed structures

In general, for the greenhouses with span less than 6 m, only wooden framed structures are used.  Side posts and columns are constructed of wood without the use of a truss. Pine wood is commonly used as it is inexpensive and possesses the required strength.  Timber locally available, with good strength, durability and machinability also can be used for the construction.



Figure: Wooden framed structure
Pipe framed structures

Pipes are used for construction of greenhouses, when the clear span is around 12m (Fig. 4). In general, the side posts, columns, cross ties and purlins are constructed using pipes. In this type, the trusses are not used.


Figure: Pipe framed structure

Truss framed structures

If the greenhouse span is greater than or equal to 15m, truss frames are used. Flat steel, tubular steel or angular iron is welded together to form a truss encompassing rafters, chords and struts.  Struts are support members under compression and chords are support members under tension. Angle iron purlins running throughout the length of greenhouse are bolted to each truss. Columns are used only in very wide truss frame houses of 21.3 m or more. Most of the glass houses are of truss frame type, as these frames are best suited for pre-fabrication.


Figure: Truss framed structure

Comments

  1. Elisha17 May 2022 at 22:16

    need to contact our online construction supplier

    ReplyDelete
  2. Greater Toronto Truss16 March 2023 at 05:59

    I am grateful that I was able to learn something useful from this article. After reading it, I believe you possess excellent expertise. Thank you for sharing that. Keep up the good work.
    Roof Trusses Ontario Canada

    ReplyDelete

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