gagyoubane　丸桁桔

KEY WORD :　architecture / general terms

Also read gangyoubane. A single heavy beam attached at right angles to the eave purlins *gagyou 丸桁, in order to relieve the bracket complexes of much of the severe downward pressure of the roof structure. From the late 16c onward, bracket complexes appeared to support enormous weight but in reality they were structurally weak and often merely decorative. They could not carry the eave purlin without the addition of the weight bearing beam. Gagyoubane are found especially in belfries *shourou 鐘楼, where a thick beam, called kanetsuribari 鐘釣梁 (bell hanging beam), extends across the building parallel to the ridge. The kanetsuribari acts like a fulcrum for the gagyoubane. The outer ends of the gagyoubane are raised above the bracket complexes by beams running parallel to the kanetsuribari. These beams are called kumimono osae 組物押 (bracket complex control). They are supported by purlins carried by the third step of 3-stepped bracket complexes *mitesaki tokyou 三手先斗きょう. The kumimono osae beams stabilize the bracket complexes and bear the downward pressure of the gagyoubane. The ends of the gagyoubane are attached to the eave purlins by tenons inserted into a mortise cut into the eave purlins.

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*dashibari 出梁

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