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本文通过对薄壁聚氯乙烯(PVC)管的多项性能测试,以塑料作为粘弹性材料的特点为依据,对薄壁PVC管的允许工作压力及使用安全性进行了论证。还以大量模拟土压试验结果为依据,论证了薄壁PVC管承受外压的能力是管材本身刚度和回填土壤反作用模量的组合;依靠管材——土壤系统的组合强度,如φ110×1.7mm及φ160×2.0mm这样的薄壁管材仍有足够的承受外压能力,在一般埋设条件下,其长期变形率可保持在允许的5%以内。由于薄壁管每米原料消耗可较国标管降低43%以上,单价降低30%左右,因此,在低压管道输水灌溉中用薄壁管代替现用硬塑管有明显的社会经济效益。
Based on a number of performance tests of thin-walled polyvinyl chloride (PVC) pipes and based on the characteristics of plastic as a viscoelastic material, this paper demonstrates the allowable working pressure and safety of thin-walled PVC pipes. Based on a large number of simulated soil pressure test results, it is demonstrated that the ability of the thin-walled PVC pipe to withstand external pressure is a combination of the stiffness of the pipe itself and the reaction modulus of the backfill soil. Depending on the combined strength of the pipe-soil system such as φ110 × 1.7 mm And φ160 × 2.0mm thin-walled pipe is still sufficient to withstand the external pressure capacity, under the conditions of the general buried, the long-term deformation rate can be maintained within the allowable 5%. As thin-walled tube consumption of raw materials per meter than the national standard pipe can be reduced by more than 43%, the unit price decreased by about 30%, therefore, in the low-pressure pipe water diversion irrigation with thin-walled tube to replace the existing hard plastic pipe has obvious social and economic benefits.