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古建筑的屋顶规模与形状因建筑的平面、规模、构造方法等的不同而差异很大,但是随榑(或桁)的上、下、左、右位置确定建筑高度的方法是大木作做法采用的基础方法。通过分析各时期具有代表性的建筑中叉手与托脚的使用情况,发现随着明代的梁变大,斗栱变小而榑的位置越来越跟梁相接,在结合部位的榫卯部分形成防止樽(或桁)推出去的鼻子部分之后,榑(或桁)已经不需要托脚这个构件支撑了。因而,梁和榑(或桁)结合点的位置随时代而变化,明代以后梁架的鼻子部分准确地固定桁,这些说明鼻子的形成是引起托脚消失的一个主要原因。
The size and shape of the roof of an ancient building vary greatly depending on the level of the building, its size and the method of construction. However, the method of determining the height of the building with the upper, lower, left and right positions of the 榑 (or girder) The basic method. By analyzing the use of the fork and foot in the representative buildings in each period, it was found that as the beam of the Ming dynasty became larger and the bucket became smaller and the position of the plover became more and more connected with the beam, the mortise and tenon of the joint After forming the part of the nose that prevents the bottle (or stringer) from being pushed out, the strut (or stringer) is no longer supported by the support foot. As a result, the location of the junction of the beam and stirrup (or girder) changes with time, and the nose of the beam fixes the stringers exactly after the Ming Dynasty, indicating that the formation of the nose is a major cause of the disappearance of the support foot.