世界上对拱结构的起源众说不一。或认为导源于自然界溶洞天然拱;或认为起自崩落的堆石拱;或认为由于砌墙开洞,逐渐由“假拱”演变而成。在中国,从墓葬结构及仅存实物,显示出拱是由梁与侧柱逐渐演变为三、五、七等折边拱,然后演变为圆 The world is different about the origins of the arch structure. Or think that the natural source from the natural cave arches; or think of the collapse from the rockfill arches; or because of the wall openings, gradually by the “false arch” evolved. In China, from the burial structure and the mere existence of objects, it shows that the arch gradually evolves from the beams and jambs to three, five, seven and other folded edges and then turns into a circle