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塑料暗管在农田使用中易于淤塞失效。为了延长其使用寿命和提高经济效益,合理设滤与有效的冲淤是非常重要的。经研究,塑料暗管的淤积与土壤、管子、滤层等因素有关。其中主要是回填土不密实或土壤质地轻,稳定性差,土粒易随水渗流入管造成淤积。试验说明塑料暗管的孔宽<1.1mm亦能较好防淤;稻谷壳比稻草防淤效果高83.3％。因此,稻谷壳可作为水稻产区的主要滤料。我们将塑料暗管从灌渠旁引出地面,用泵引渠水冲淤,15分钟可冲出管中淤泥的一半(约4.8—11.3kg),相当于开塞自流放水冲淤效果的十倍。
Plastic tube in the farmland easy to block failure. In order to prolong its service life and improve economic efficiency, it is very important to set filter and effective scouring and silting reasonably. After research, the plastic tube deposition and soil, pipe, filter and other factors. The main reason is that the backfill soil is not dense or the soil texture is light and the stability is poor. The soil particles can easily cause siltation with the seepage into the pipe. Test shows that the plastic tube of the hole width <1.1mm also better anti-silt; rice hull than silt anti-silting effect of high 83.3%. Therefore, rice hulls can be used as the main filter media in rice producing areas. We will plastic tube out of the irrigation canal next to the ground, with the pump drainage water scouring, 15 minutes out of the tube half of the sludge (about 4.8-11.3kg), equivalent to plug Cypriots self-effluent scouring and sedimentation ten times.