8 pole reciprocal frame bamboo shelter

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We demonstrated this roof at the Nepal bamboo workshop.

Eight poles were chosen as they are easy to evenly lay out on the ground and overlap reciprocally.

This arrangement produced a slightly inclined roof with a large central opening.

In order to close this opening and increase the incline of the roof it is necessary to use a central "prop" ( or charlie stick ) during construction . This pole is removed on completion of the frame which supports itself.

This roof frame can either be constructed on the ground or on top of 8 pre-sunk posts,

Transitional shelter 8

8 poles are first laid on the ground and overlapped reciprocally

Transitional shelter 9

ridge poles are added and the roof is lashed together

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Transitional shelter 9
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In order to increase the incline of the roof a central "prop" pole is used to support the reciprocal frame during construction

The central support pole enables the poles to be inclined so that the central opening is very small

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Alternatively a large prop pole can be used if the roof is constructed on top of posts

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trans 11

Additional small bamboo rafters are laid.

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A tarpaulin can then be overlaid if required.

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Walls are completed using mud bricks or a bamboo lattice and mud frame.

Advantages of this reciprocal frame roof:

  • A simple but strong construction method easy to build with.

    •  
      • No complex joints are needed. Only traditional cross lashing of joints is required.

          • The reciprocal frame roof supports more weight than a conventional apex roof,

            •   allowing more cladding and therefore a cooler interior.  
              • The weight of the roof itself is supported equally by eight posts without the spreading forces of conventional roof designs. This means that less internal "tying

                •   in" of walls is required.
                  • No central support pole is needed for large roof spans.  

                      • Sectional walls are not load bearing so mud bricks can be used.

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