拱上結(jié)構(gòu)的灌筑順序,應(yīng)使拱梁所受荷載在拱頂兩側(cè)對(duì)稱分布;并應(yīng)使拱梁在灌筑上部結(jié)構(gòu)時(shí)不致產(chǎn)生超載。(5分)