聚苯板和聚氨酯板渠道保温防冻胀效果及经济性分析

针对用于衬砌渠道中不同保温材料防冻胀的性能,在黑龙江省蛤蟆通灌区采用现场试验方法,对聚苯板和聚氨酯板渠道保温防冻胀不同方案的渠道基土温度、冻胀量以及经济性进行了对比分析。结果表明:混凝土衬砌渠道铺设保温板后具有明显的保温防冻胀作用,可以有效地防止或减弱渠基土体冻胀的发生;在蛤蟆通灌区及其相似地区,选用不小于4cm厚的聚氨脂板或不小于8cm厚的聚苯板,可以获得理想的防冻胀效果;聚氨脂板保温性能更佳,但同等条件下造价高于聚苯板30%左右。聚苯板经济性更好,更适宜在实际工程中推广应用。

Analysis of the heat preservation and anti-frost effects and the economic effect of polystyrene board and polyurethane board channels

In order to investigate the anti-frost effect of different heat preservation materials used in the concrete lining channels. The paper conducts a comparative analysis of the temperature of canal foundation, frost heave and economical efficiency of polystyrene board and polyurethane board, through the test at Hamatong Irrigation Area in Heilongjiang Province. The findings are as follows: First, the laying of thermal insulation board under the lining layer of the irrigation ditch can effectively reduce or prevent the frost heaving failures of the foundation soil. Second, polystyrene board thicker than 8 cm or polyurethane board thicker than 4 cm is the ideal choice for Hamatong Irrigation Area and similar areas in terms of the insulation and anti-frost effect. Polyurethane board is much better than polystyrene board in terms of the insulation and anti-frost effect. It is also found that a 4 cm-thick polyurethane board performs similarly as an 8 cm-thick polystyrene board. The polyurethane board is better in terms of heat preservation, but the cost is 30% higher than the polystyrene. Given the lower cost of polystyrene board, it is suggested that polystyrene board is more suitable to be popularized and applied in practical engineering.