Skew blocks shall tightly abut to arch-springing beam. Arch or vault shall be built after completion of bricking-up(s) (if any) behind skew blocks.
英
美
释义
拱脚砖应紧靠拱脚梁砌筑。当拱脚砖后面有砌体时,应在该砌体砌完后,才可砌筑拱或拱顶。
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