Having started with the ICU joint in a previous blog to try to create a nail-less join for timber or steel beams and posts for simple construction, i thought about the implications for spending a vast amount of money on developing the joints for use in East Timor. It seemed a little excessive to spend the money on such a joint when money could be saved on a simpler system which would allow the funds to be aligned to other areas of construction.
Besides this, there was a fundamental flaw in the ICU joint. It didn't lock down completely as one plane could still come apart if forces pushed that way.
initially i said for the joint to be placed with the first part down to enable gravity to act as the bind, but if in the case of an earthquake or similar force from a strike and the joint was to shift against gravity, the joint would lift off and possibly come apart.
so...
where next?
i then experimented with the idea of joining bamboo...

this joint would seem to work, but would be limited to light weight construction and only to two planes.
so, i then thought about creating a rigid steel connection that could be used for timber and bamboo (although drilling a hole in bamboo is likely to weaken it and make it perceptible to splitting under lateral forces.
here is the sketch...
this looks effective for the type of easy construction needed for the Dili site. it would also be versatile in its dis-assembly also.
Here is a CAD version...
these could be made with any/all combinations for ease of construction.
The wall system of sliding panels (from previous blog) into timber beans could be implemented with this allowing for a simple curtain walling system to be used.
these connections have been designed with a 90mm x 90mm aperture in each connector. if smaller sized timbers were available only, either a chock could be used to wedge in the beam of another set of smaller collars could be developed to slide into the aperture to minimise the hole.
Here is an image of how the panels could be used within the curtain wall...
