dokkohozo　独鈷ほぞ

KEY WORD :　architecture / joints

Also called hikidokko 引独鈷; hikidokko ari 引独鈷蟻. One type of *yatoihozo 雇ほぞ, a right angle joint with an imbedded spline tenon. Dokkohozo has a long tenon cut into a shape resembling the dokko 独鈷, an instrument used in Esoteric Buddhist mikkyou 密教 ritual. Its purpose is to join two members meeting at right angle, for example, a single transverse beam and a purlin, a beam inserted into a post, or a footing ashigatamebari 足固梁 into a post etc. This is done by making a dokkohozo i.e, a spline tenon. The shapes of each end of the spline are cut from the member already secured in the over all structure and from the member to be joined. The spline tenon is then inserted into the stationary member, for example, a column. Next, the part to be attached, for example, a footing, is joined to the extended end of the dokkohozo and secured by keys *shachi 車知. Because the tenon is long, pins *sen 込栓, are inserted through the pillar or post and through the tenon to secure it. This is not a true tenon and mortise joint *mechigaitsugi 目違継.

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