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Earthbag-Building-The-Tools-Tricks-and-Techniques

Earthbag-Building-The-Tools-Tricks-and-Techniques

Push the two-by-four

Push the two-by-four solid wood part of the anchor flush against the form. Velcro the plywood strip part of the anchor by hammering three-inch (7.5 cm) long nails through it into the tamped bag below. Make sure to pre-trim the strip anchors to conform to the shape of a curved wall (Fig. 6.50). The barbed wire can now be laid on top of the strip anchor and the bag work can continue as usual. When installing a bag against forms directly on top of a strip anchor, it is usually unnecessary to hard-ass the bag as the strip anchor will take up too much space. STEP-BY-STEP FLEXIBLE-FORM RAMMED EARTH TECHNIQUE 89 Teamwork Follow all the steps previously outlined. As the walls get taller, the assistance of willing friends (or paid help) speeds the progress by sharing the work. For less down time, have several wheelbarrows loaded in a row where you are working, or have a third person recycling the wheelbarrows (Fig. 6.51). Have enough people on hand when laying barbed wire high up. Someone guiding the reel of wire on the ground keeps it from tangling around the person up on the wall. Always use caution when working with barbed wire, doubly so when high up (Fig. 6.52). 6.50 6.52 6.51

90 EARTHBAG BUILDING 6.53 6.54 Arch Forms We are now high enough to install our arch forms! Place the arch form directly on top of the box form, without the wedges. Continue the next row of bags as an aid in locking the arch forms in position. Gently half tamp the bags with equal force on both sides of the arch form (Fig. 6.53). When the arch form is secure, insert the wedges on the front and back of the form and tap them in until the forms are level and plumb. Tap wedges in deep enough to create a good inch-wide (2.5 cm) space between box and arch forms, to give ample room for the arch form to be removed later. When using just an arch without the box form, set the arch form on a one-inch (2.5 cm) thick board or piece of plywood the same width as the arch form and the same depth as the bag wall. Drive some nails into the board to Velcro it to the wall holding it in place (Fig. 6.54). The wedges will go in between the board and arch form. The board will keep the wedges from digging into the bags. You can now finish off by tamping the bags on both sides of the form along with the rest of the wall. This will secure the position of the arch (Fig. 6.55). Fan Bags These are the bags that begin the springline that creates the arc of an arch. Fan bags are first tamped from the inside, similar to a hard-assed bag. The main difference is that a fan bag is tamped into a wedge shape and is filled only 12 inches (30 cm) high. This height fan bag 6.55 6.56 produces a strong, attractive framework around the arch openings and ties in well with the barbed wire mortar and surrounding bag work.