practical shelter innovation for disaster relief

Improving shelter security

Both the steel frame and bamboo shelter kits provide better security than a tent.

The reason for this is :

1. Part or full height solid walls can be built form earthbags, mud bricks,
stone or bamboo lattice panels.

2. The roof can be reinforced by adding solid construction materials.

In the following examples security is improved by building earthbag walls and then reinforcing the roof.

The bamboo or steel reciprocal frame has several advantages over traditional roofs for earthbag wall shelters.

1 Simple assembly.
The reciprocal frame can be assembled on the ground and then simply lifted into position.

2. Minimal "spreading" forces are exerted at its points of support.
Traditional roofs require carefully located trusses to prevent these forces, whereas a horizontal plane reciprocal frame roof exerts forces vertically down on the walls.

3. The reciprocal roof frame is a self - supporting structure.
The weight of covering materials is equally shared between all the poles.

4. It is the most efficient type of roof span.
The reciprocal frame can make use of shorter length poles to span a given roof space. Salvaged poles that are not long enough to span the roof space can therefore be used.

5. Easily reinforced or repaired.
After the basic roof has been built it can easily be worked on from the inside.
In a typhoon the roof can be rapidly modified and lowered to provide a survival capsule for the family.

In this example the roof span starts with just a 4 pole reciprocal frame

Sandbag RSK

Inclined roof

Two units share a central wall

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