ariotoshi 蟻落
KEY WORD : architecture / joints
Also called *arikake 蟻掛.

1 A simple angle joint *shiguchi 仕口, composed of a dovetail mortise arihozoana 蟻ほぞ穴, and tenon *arihozo 蟻ほぞ, joining two members. This joint with an added bench *koshikake 腰掛, can also be used at the connection of two lengthwise beams *tsugite 継手, beyond the top of a pillar.

2 A variation is a dadoed, half-lapped, half-blind dovetail ooire mechigaitsuki ariotoshi 大入目違付蟻落, mortise and tenon. A recessed dovetail mortise is cut slightly less than half the distance from the center of the top face and about half the depth of the beam. In front of the dovetail mortise a shallow rectangular pocket is made the height of the beam. A dovetail tenon cut from the upper half of the end of another beam is inserted into the dovetail mortise, and the beam end enters to the depth of the pocket. This joint is stronger than the simple dadoed dovetail. Used in veranda-floor construction to join the outermost joist *enkazura 縁葛, to the outermost strut *enzuka 縁束. It effrectively resists the tendency to pull apart due to stress from the horizontal movement on the veranda-floor boards above. The joint also is used for ground sills *dodai 土台.

*ari 蟻, *aridome 蟻留 

(C)2001 Japanese Architecture and Art Net Users System. No reproduction or republication without written permission.