Wednesday, March 24, 2010
Tuesday, March 16, 2010
Two otherwise excellent sections were marred by a broken joint: it was time to experiment with some repair techniques. This successful repair was done by pounding earth into the hole with the end of the wooden block, and finished with the side of the block to level it with the surrounding surfaces.
Our third functional formwork, Form3.1. The same basic design as Form3 but with a few improvements: stronger side panels made from Cyprus instead of pine, and evenly spaced clamping frames to allow for easier shuffling of the frame along the walls.
Monday, March 15, 2010
Sunday, March 14, 2010
Thursday, March 11, 2010
Monday, March 8, 2010
After the failed first test a number of lessons were learned: that the form needed to be stiffened dramatically to stop flexing, the areas around the bolts needed reinforcing and the form needed to be narrowed by a couple of centimeters to protect the edge of the foundation cap.
The materials of Formwork 1 were recycled to form the basis of formwork2. A new set of braces and brackets were fitted to the outside of the forms, and the clamps were replaced with pairs of through-bolts.
The formwork was constructed by local carpenters using a locally available pine. The design was based on a rolling formwork design by Middleton. After some delays finishing the form and the mallets the testing began. Because it was late in the day, low section of wall under a window was selected to be the test wall.
It was immediately obvious that the timber was too green and soft for the number of braces used, as it started to flex in between the clamps on only the first course. As the ramming continued the foundation cap began to chip-off in a couple of places. A second course was added to one end section that wasn’t flexing and, before it was rammed firm, one of the end bolts pulled through.
The rather paltry wall sample was left in place to see how it would fair in the elements and if it would firm up with time.