Shellfish Passage - Kai no Kuchitsugi

… Traditional kiri-gumi joints used in Japanese wooden architecture are classified according to their function: (1) those that simply increase length, (2) those that withstand twisting forces, (3) those that withstand tensile forces, and (4) those that withstand tensile and twisting forces. (1) includes tsukitsuke (a joint that adds length), dantsugi (a joint that resists twisting), and sogitsugi (a joint that resists tension). (2) includes mechigai-tsugi (a joint that resists twisting), kai-no-kuchi-tsugi (a joint that resists twisting), (3) includes ari-tsugi (a joint that resists twisting), sickle-tsugi (a joint that resists twisting), pole-tsugi (a joint that resists twisting), and (4) includes otsukake-daisen-tsugi (a joint that resists twisting), kanawa-tsugi (a joint that resists twisting), and isukatsugi (a joint that resists twisting). Dantsugi and sogitsugi are used for joists and rafters, and kai-no-kuchi-tsugi for the central pillars of towers. …

*Some of the terminology that refers to "Kai no Kuchitsugi" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　日本の木造建築で用いられる伝統的な切組み継ぎはその効用によって，(1)単に長さを増すだけのもの，(2)捩れ（ねじれ）の力に耐えるもの，(3)引張りの力に耐えるもの，(4)引張りと捩れの力に耐えるものに分類される。(1)には突付（つきつけ），段継（だんつぎ），殺継（そぎつぎ），(2)には目違継（めちがいつぎ），貝の口継，(3)には蟻継，鎌継，竿継(竿車知継（さおしやちつぎ）)，千切継（ちぎりつぎ），(4)には追掛大栓継（おつかけだいせんつぎ），金輪継（かなわつぎ），鶍継（いすかつぎ）などがある(図)。段継や殺継は根太（ねだ）や垂木など，貝の口継は塔の心柱に用いられる。…

※「貝の口継」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報