当门窗洞口宽度≤1200毫米时,洞口过梁一般采用钢筋砖过梁。《砖石工程施工及验收规范》规定:砌筑钢筋砖过梁,如设计无具体要求,底面应铺设1:3水泥砂浆层,其厚度宜为3厘米;钢筋应埋入砂浆层中,两端伸入支座砌体内不应小于24厘米,并有90°弯 When the width of doors and windows is less than or equal to 1200 mm, the lintels in the openings are generally made of reinforced concrete beams. “Masonry and Stone Project Construction and Acceptance Criteria” stipulates: masonry reinforced concrete lintels, if there is no specific design requirements, the bottom should be laid 1:3 cement mortar layer, its thickness should be 3 cm; reinforced steel should be buried in the mortar layer, two The end extension into the bearing block body should not be less than 24 cm, and there is a 90 ° bend