nijuukouryou kaerumata 二重虹梁蟇股
KEY WORD : architecture / general terms
 
A framework used especially in temples and shrines to sustain the roof. It is composed of double rainbow beams *kouryou 虹梁 separated by frog-leg struts *kaerumata 蟇股. The upper rainbow beam is about half the length of the lower one. Frog-leg struts carrying bearing blocks are placed about one fourth of the way in from each end of the lower rainbow beam to support the upper one. A bearing block with a 3-on-1 bracket arm is placed on each end of the upper rainbow beam to carry purlins. Another frog-leg strut is placed at the center of the upper rainbow beam to carry the 3-on-1 bracket complexes that support the ridge *mune 棟. The lower rainbow beam is the larger of the two and is normally a big, heavy beam. To distinguish between the upper and lower rainbow beams, the lower one is called daikouryou 大虹梁, or more rarely ookouryou. Occasionally, daikouryou simply refers to a very large rainbow beam, but the upper smaller beam is never called shoukouryou 小虹梁.
 
Houryuuji Denpoudou 法隆寺伝法堂 (Nara)
Houryuuji Denpoudou 法隆寺伝法堂 (Nara)

 
REFERENCES:
*kouryou kaerumata 虹梁蟇股, *wayou 和様
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NOTES
 

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