They made joints in stone, keepingthe lintels in place horizontally using atongue and groove joint, and subsequentlyfixing the upright and lintel with a ball andsocket joint or mortice and tenon.

• 石匠们用楔口连接法将楣石水平放置，将石块连接起来，然后将这些直立的石块和楣石用球窝接头或楔口接头来固定。