The Wedge Box Fig 319

The wedge box is a special form for pre-tamping the fan bags that surround the arch form. The wedge box is designed to pre-shape a proper wedge shape to accommodate any size Roman arch by simply adding or reducing the number of fan bags used. The wedge box holds a bag that is filled and tamped 12 inches (30 cm) high. If you fill a fan bag in the wedge box on top of the wall, the wedge box then can be opened to slide the pre-tamped fan bag into place around the arch form. You can use the wedge box on the ground, as well, and then the pre-tamped fan bag can be handed up to a worker on the wall (Fig. 3.20, 3.21 & 3.22). (The directions for making your own wedge box can be found in Appendix A).

3.19: The wedge box is a form for creating uniform fan bags.

Two Man Handsaw Cartoon

The ends of the wedge box are removed and the sides drop down for easy removal of the pre-tamped fan bag.

3.22: The fan bags only weigh about 40 pounds (18 kg), the approximate weight of an average American-made adobe brick.

The ends of the wedge box are removed and the sides drop down for easy removal of the pre-tamped fan bag.

3.22: The fan bags only weigh about 40 pounds (18 kg), the approximate weight of an average American-made adobe brick.

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