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.pdf

水利水电技术第48卷2017年第2期
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
银英姿,贾琦,赵强,张栋,周娟
(内蒙古科技大学建筑与土木工程学院,内蒙古包头014000)
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;聚苯乙媂保
温板(EPS)含水量每增加1%,会导致导热系数増大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。
关键词:混凝土衬砌;聚苯乙媂保温板(EPS);保温性能;含水量;果道施工;季节性冻土区;内蒙
古河套灌区
doi:10.13928/j.cnki, wrahe.2017.02.029
中图分类号:TV315(226)
文献标识码:A
文章编号:1000-0860(2017)02-0170-05
Impact from water content on durability of thermal insulation board and design of
thermal insulation board thickness
YIN Yingzi, JIA Qi, ZHAO Qiang, ZHANG Dong, ZHOU Juan
(School of Architecture& Civil Engineering, Inner Mongolia University of Science&Technology, Baotou 014000, Inner Mongolia, China)
Abstract: Thermal insulation board is widely used to prevent concrete lining from frost-heaving damage for most of the irrigation
channels in the north of China. In order to reduce the cost, it is prone to ignore the worsening of the thermal effect of the thermal
insulation board caused by all kinds of the relevant factors during the utilization of it, which can make the concrete lining not
reach the design working life and damage in advance. The experiment made in Hetao Irrigation District of Inner Mongolia shows
that under the impacts from the factors of acid rain, effect of freeze-thaw, water content, etc. the thermal insulation effect of
the board therein averagely decreases by 0.9C every year, in which the impact from water content is the largest. It is obtained
from the relevant test that each increase of 1% of the water content can lead the thermal conductivity to be increased by 5% for the
polystyrene insulation board (EPS ). Based on both the superposition principle of thermal resistance in series and the equivalent
thermal resistance principle of multilayer material, the formula for calculating the thermal insulation board thickness is improved
and then the corresponding placing method and construction technique are put forward as well. The design has a certain reference
value for the popularization and application of the thermal insulation board within the seasonal frozen soil region.
Keywords: concrete lining; polystyrene thermal insulation board(EPS ); thermal insulating property; water content; channel
construction; seasonal frozen soil region; Inner Mongolia Hetao irrigation District
收稿日期:2016-11-16
基金项目:内蒙古自治区自然科学基金项目(2013MS0717);水利部公益性行业科研专项经费项目(201301094)
作者简介:银英姿(1968-),女,教授级高级工程师,主要从事水工建筑物冻害研究。E-mail:81489571@q.com
通信作者:贾琦(1991-),男,硕士研究生,主要从事岩土工程研究。E-mai:544467516@qq.com
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Water Resources and Hydropower Engineering Vol 48 No. 2
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