应县木塔修缮用木材的防裂措施

Measures to control seasoning checks of wood used for the repair of the ancient wooden tower in Yingxian County,Shanxi Province

作者根据国家标准《古建筑木结构维护与加固技术规范》GB5016592的规定,建议选用兴安落叶松为应县木塔修缮用材.针对这种木材易于开裂的特性和修缮后再传承千年的要求,该文根据落叶松木材气干过程中开裂程度的试验及落叶松和冷杉胶合梁胶合质量对比试验的结果,提出了采用侧边破心方木钉连接组合梁和层板胶合木两项防裂措施,能将木塔修缮中需置换的木构件干缩裂缝深度控制在GB5016592规定的限值内.

The Larix gmelini is suggested by the authors to be used to repair the ancient wooden tower in Yingxian County of Shanxi Province in accordance with the provision of Technical Code for Maintenance and Strengthening of Ancient Timber Buildings, i.e. GB 50165-92. Since the checks during seasoning are more deeper than that of the other species and Yingxian County wooden tower is demanded to be handed down for thousand years after the repair, based on the testing results of an investigation for finding out the regularity of the seasoning checks and the contrast test of glued-laminated timber beams made of larch and fir, two measures to control seasoning checks are suggested： nail-connected beam of a pair of sawn timbers, the wide side of which is cut along diameter of the round timber; and glued-laminated timber. The checks of the timber members used to the repair of wooden tower in Yingxian County will be controlled within the limit stipulated in GB 50165-92.