含水量对渠道保温板保温耐久性的影响及保温板厚度设计
发布时间：2018-08-09 11:44
【摘要】：北方渠道大多使用保温板防止混凝土衬砌受冻胀破坏。在计算保温板厚度时为了降低成本,容易忽略保温板使用过程中受各种因素的影响导致保温效果变差的情况,使混凝土衬砌达不到设计使用年限便提前被破坏。内蒙古河套灌区试验结果表明,由于受酸雨、冻融作用、含水量等因素的影响,保温板保温效果平均每年降低0.9℃,其中受含水量变化的影响最大。经试验测得:聚苯乙烯保温板(EPS)含水量每增加1%,会导致导热系数增大5%。基于多层材料串联热阻叠加原理和热阻等效原理,对保温板厚度计算公式进行完善,并提出相应的铺设方法和施工技术要求。该设计对保温板在季节性冻土区的推广应用具有一定参考价值。
[Abstract]:The northern canal mostly uses insulation board to prevent concrete lining from being damaged by frost heaving. In order to reduce the cost in calculating the thickness of the insulation board, it is easy to ignore the situation that the insulation effect becomes worse due to the influence of various factors in the process of using the insulation board, so that the concrete lining can not reach the design service life and is destroyed in advance. The experimental results of Hetao irrigation area in Inner Mongolia showed that the insulation effect of insulation board was reduced by 0.9 鈩，
本文编号：2173971
[Abstract]:The northern canal mostly uses insulation board to prevent concrete lining from being damaged by frost heaving. In order to reduce the cost in calculating the thickness of the insulation board, it is easy to ignore the situation that the insulation effect becomes worse due to the influence of various factors in the process of using the insulation board, so that the concrete lining can not reach the design service life and is destroyed in advance. The experimental results of Hetao irrigation area in Inner Mongolia showed that the insulation effect of insulation board was reduced by 0.9 鈩，
本文编号：2173971
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