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某施工单位承接了长67.8km的的答案

某施工单位承接了长67.8km的二级公路旧路面"白改黑"改建施工,旧路面为水泥混凝土面层,使用9年后面板破损严重,主要的病害有:裂缝、断板、板底脱空。设计院现场勘察后认为必须重建,设计院进行了旧路改建设计,设计要求将旧路面做碎石化处理,加铺SMA面层。在右侧岩层破碎的挖方路段增设了护面墙和1m宽的A平台。路面结构如下图所示。
事件1:施工单位针对旧路面碎石化施工做了详细的技术交底,现将部分技术要点摘录如下:(1)在路面碎石化施工正式开始前,选择有代表性的路段作为试验段,获取破碎参数。(2)在正常碎石化施工过程中,应根据路面实际状况对破碎参数不断作出微小的调整。(3)路面破碎时,先破碎中部的行车道,然后路面侧边的车道。两幅破碎一般要保证10cm左右的搭接破碎宽度。(4)机械施工过程中要灵活调整行进速度、落锤高度、频率等,尽量达到破碎均匀。(5)路面碎石化后,应清除路面中所有松散的填缝料、胀缝料、切割移除暴露的加强钢筋或其他类似物。(6)路面碎石化后进行压实,表面低凹处在压实前采用黏土回填、找平,以保证加铺沥青面层的平整度。
事件2:SMA的碾压遵循一定的原则:碾压温度越高越好.摊铺后应立即压实,不得等候。SMA路面碾压宜采用振动钢轮压路机初压1~2遍、复压2~4遍、终压1遍的组合方式。SMA面层施工切忌使用胶轮压路机或组合式压路机。采用振动压路机时,宜用高频率、低振幅。
事件3:护面墙基坑开挖后,按照《高处作业分级》,根据护面墙砌筑作业区的高处作业高度,将护面墙砌筑按高处作业进行施工,严格按高处作业的相关技术要求执行。

问答题
2021-08-31 02:36
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正确答案

1.(3)改正:路面破碎时,先破碎路面侧边的车道,然后破碎中部的行车道。(6)改正:表面凹处在10cm×10cm以内,在压实前可以用密级配碎石回填,10cm×10cm以上的应利用沥青混合料找平,以保证加铺沥青面层的平整度。
2.“紧跟、慢压、高频、低幅”原则。
3.最大过水面积:(0.5+0.5+0.5×0.5)×0.5/2=0.31(m2)。

 


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