Design method for concealed conduit with externally coated filter material
A design method and technology of hidden pipes, applied in construction, application, soil drainage, etc., can solve the problems of insignificant engineering effect and cumbersome procedures, and achieve the effect of improving drainage effect, ensuring uniformity, and improving water seepage capacity.
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[0017] Analysis of the principle of reverse filter layer:
[0018] Such as figure 1 As shown, the results of this design method include a drainage pipe 1, a straw rope wrapping material 2, a geotextile strip 3, a nylon thread 4, and a conveying device 5 combined. Among them, the straw rope wrapping material 2 and the geotextile 3 constitute a drainage filter layer structure. It is known from the test and previous experience that the water permeability coefficient of the straw rope wrapping material layer 2 is greater than 1cm / s, and the water permeability coefficient of the geotextile 3 is 10 -2 cm / s to 10 -1 cm / s, and the protected soil takes loam as an example, the permeability coefficient of loam is 10 -5 cm / s to 10 -3 cm / s, it can be seen that the water permeability of the straw-wrapped material 2 is far greater than that of the geotextile 3, and the water permeability of the geotextile 3 is far greater than that of the protected soil. 2 and geotextile 3, the drai...
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