钢筋植筋锚固长度怎么确定?哪个质量比较好

2025-03-31 21:59:42
推荐回答(1个)
回答(1):

1、弹线定位依照变更设计图纸的钢筋数量及位置,标注出植筋位置。经我质检部门验收,位置符合设计要求后才可以钻孔。2、钻孔用冲击钻钻孔,钻头直径应比钢筋直径大4~8mm上下,钢筋直径为Φ25,钻头选用φ32的合金钻头。钻孔深度不小于20d(d为钢筋直径),实际钻孔深度应取600mm,钻头始终与承台保持垂直。备注:按照《混凝土结构加固设计规范》GB50367-2006中提供的植筋基本锚固长度公式计算:锚固深度ls=434mm,小于实际钻孔深度,故实际钻孔深度符合要求。3、洗孔洗孔是植筋中最重要的一个环节,由于孔钻完后内部会有很多灰粉、灰渣,直接影响植筋的质量,一定要把孔内杂物清理干净。方法是:用不掉毛的毛刷,套上加长棒,伸至孔底,来回反复抽动,把灰尘和碎渣带出,再用空压机吹出浮沉。吹完后再用脱脂棉沾酒精或丙酮擦洗孔壁。但不能用水擦洗,由于用酒精或丙酮容易挥发,水不易挥发。再者用水后孔内不会很快干燥。洗孔完成后需要经我质检部门验收,自检合格后报监理验收,验收合格后方可注胶。4、钢筋处理钢筋锚固部分要清除表面锈迹及其他污物,通常采用角向磨光机配钢丝刷除锈,打磨至露出金属光泽为止,若钢筋锈蚀严重,要用稀盐酸浸泡除锈10-15分钟,后用石灰水中和,再用清水冲洗后擦干方可使用。5、注胶锚固胶要选用合格的植筋专用胶水,产品要有合格证明,要能够满足我项目承台植筋施工要求。注胶要从孔底开始,这样可以排出孔内的空气,为了使钢筋植入后孔内胶液饱满,又不能使胶液外流,孔内注胶达到孔深的1/3或计算孔内的用胶量,应扣除钢筋体积,孔内注完胶后应立即植筋。6、植筋首先将配置好的结构胶注入孔内(宜孔深的1/3或计算孔内的用胶量,应扣除钢筋体积),并将结构胶涂于钢筋锚固端(宜2-3㎜),然后缓慢将钢筋插入孔内,同时要求钢筋旋转,使结构胶从孔口溢出,排出孔内空气,钢筋外露部分长度保证工程需要。7、养护植筋施工完毕后关注保护,24小时之内严禁有任何扰动,以保证结构胶的正常固化。8、检测试验在植筋前,要对所用钢筋及植筋胶进行现场拉拔试验,以确定钢筋及植筋胶是否符合设计要求。方法是:制作与要植筋部位混凝土结构相同强调等级的混凝土试件,按植筋步骤,植入3组钢筋,待植筋胶完全固化后,进行拉拔试验。试验用专用的钢筋测力计,当加力达到Ⅱ级钢筋屈服强度时,钢筋出现颈缩现象,继而拉断,这表明钢筋和植筋胶都是合格的。植筋后进行非破损性拉拔试验,用来检测工作状态的植筋质量,检测的数量是植筋总数的10%。检测中,测力计施加的力要小于钢筋的屈服强度,大于设计部门提供的植筋设计锚固力值。公式为:FMmm2;FYK:钢筋的屈服强度,N/mm2;FM:植筋设计锚固力,N/mm2)。8、绑钢筋浇筑混凝土检测试验合格后就可进行下道工序施工。

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