nejigumi　捻組

KEY WORD :　architecture / joints

Lit. twisted construction. A bevelled, wooden, angled joint, sogi mokuzou shiguchi 殺木造仕口, commonly used to connect eave purlins *gagyou 丸桁, with hip rafters *sumigi 隅木 at the corner of a wooden building. The tenoned part of the joint ogi 男木, is cut into the top purlin *uwagi 上木 and the indented part of the joint *megi 女木 is cut into the bottom purlin *shitagi 下木. The bevelled surfaces of the tenoned and indented parts of the joint are such that their surfaces are equally divided along the line of the pitch of the hip rafter. The down-bearing load of the hip rafter is equally carried by both the top and the bottom parts of the joints on each beam. The stacked tenon *juuhozo 重ほぞ is cut from the top of the pillar. It is inserted into the coinciding holes made on each part of the bevelled, wooden, angled joints. In order to fit properly, hips *koshi 腰 of the tenon have been given a slant. This method of construction is used for pyramidal roofs *hougyou-zukuri 宝形造, and hip roof *yosemune-zukuri 寄棟造 timbers.

REFERENCES:

*shiguchi 仕口

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