watariago　渡腮

KEY WORD :　architecture / joints

Also called *agokaki 腮欠, agokake 腮掛. A cogged right-angled joint. Two timbers cross each other at right angles: shallow notches are cut on each side of the lower beam running parallel to the beam length, leaving an uncut section in the center of the beam. The upper beam, which is laid across the under one at a 45゜ angle, has only one dadoed cut at right angles to its length. The cut is of sufficient depth to allow a snug fit into the notches on the lower beam. For further strengthening, large mortises can be cut into the centers of each part of the joint and connected with a heavy pin. When the beams are joined the pin cannot be seen. This joint is used for cantilevers. Variants of this joint include: when only the upper beam has a dadoed cut at right angles to its length and is made to fit over an unnotched under beam. This joint is called watarikaki 渡欠; when the top and bottom beams are cut with a dovetail *ari 蟻, joint on one side and the usual cogged, rectangular joint on the opposite side. This joint is called watariago arikake 渡腮蟻掛. These joints are common in roof framing of folk dwellings in the transverse beam *koyabari 小屋梁, and in the eave purlin *gagyou 丸桁. These joints are also used in the corner logs azegi 校木, of the style storehouses *azekura 校倉; and in the joining of transverse beams and purlins in temple construction.

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