Construction method for matching backwash in water purification building filter layer

Abstract

The present invention discloses a construction method adapting backwash devices in water purification floor filtrated layer, it includes water purification floor which is equipped with backwash pipeline, macrostoma sunk wells which are installed along clear-water reservoir and rectangular seep ditches which are installed separately, the macrostoma sunk wells and the rectangular seep ditches are equipped with rectangular belling intake channel separately and are laid and extended towards upstream and downstream of rivers, its upper half pipe wall is also equipped with washing holes and eyelets. It also includes the following steps: (1) digging the filtrated layer in the outer washing zone of water purification floor or back-filling to the design depth;(2) laying the backwash pipes on the bottom of the filtrated layer; (3) filling sand cobble of washing holes and eyelets which size is bigger than upper half pipe wall on the outside of upper half pipe wall to forming surface filtrated layer; (4) casting concrete antiscour pillar on the backwash pipelines on site;(5) covering or filling original filtrated layer flat with river bed. The construction method in the invention can recover or renew the water purification floor filtrated layer in a short time, reduce project investment and water control cost significantly, and can stabilize the water yield of water purification floor in a long term and improve water supply quality.

Description

technical field [0001] The invention relates to water purification construction, in particular to a construction method for backwashing in the filter layer of a water purification building. Background technique [0002] The applicant's prior patent CN1067132C announced "A Method for Constructing a Caisson with Stable Water Volume" is provided with a rectangular trumpet-mouthed water inlet groove at the foot of the caisson blade to prevent the sand and pebbles from outside the well from pouring into the well. Will not be blocked, and the caisson itself will not sink, the water yield of the caisson is increased by more than 50% compared with the original method, and the water volume is stable; Using the Construction Method of Rectangular Seepage Canals, replace the original circular seepage canals with seepage canals in any direction around the caisson with large cross-sectional areas and flat seepage canal bottoms, especially the bottoms on both sides of the rectangular seepa...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to make further improvements to the prior patent of the applicant, and propose a construction method of backwashing in the filter layer of the water purification building, so as to avoid the sand and pebble surface filter layer of the water purification building from being blocked

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