WATER CONDUIT IN FILTER SOIL STRUCTURE Russian patent published in 2009 - IPC E02B7/06 

FIELD: hydraulic engineering construction.

SUBSTANCE: invention refers to hydraulic engineering and can be implemented at arranging water conduit in body of filter soil structure. The conduit consists of a pipe and a diaphragm made within limits of a filter part of the soil structure around the pipe and is attached to it, while external edge of the diaphragm is situated at specified distance from the pipe. The diaphragm is made out of a flexible sheet with open porous surface which possesses a damping property. At least near the external edge the sheet can be made water proof, wherein calculated diametre of water conducting holes is determined out of the following condition: first, a transitive layer is formed directly before the water proof sheet; within the boundaries of the transitive layer porous space in filter soil is mudded with loose soil by principle of a back filter; further, a counter filter layer is formed before the transitive layer; within boundaries of the counter filter layer porous space in filter soil is mudded with cohesive soil. Permeability of this counter filter layer grows as this layer approaches the external edge of the water proof sheet. The estimated diametre of water conducting holes in the water proof sheet meets the requirement: ≤ d^max, where d^max is maximal diametre of soil particles, transfer of which with a filter flow along contact of soil with the pipe in the direction of the diaphragm is possible and allowed.

EFFECT: preventing dynamic effect onto soil from side of diaphragm, forming pores of enlarged dimensions at contact of soil with diaphragm, forming local softened zones in soil near diaphragm, creating "focus of washout" in soil near external edge of diaphragm, and decreasing material costs at construction of diaphragm.

5 cl, 5 dwg