Sewage purification mechanism for engineering construction

The utility model relates to a sewage purification mechanism for engineering construction, which comprises a telescopic sleeve and a collecting tube, the collecting tube is arranged on the telescopic sleeve, the telescopic sleeve is provided with a backwashing mechanism and a two-way mechanism, and the backwashing mechanism comprises a one-way pipe, a guide sleeve, a guide rod, a sealing ring, a sealing sleeve, a spring, a central mechanism, an ejector rod and an external connection pipe. The one-way pipe is communicated with the collecting pipe, the guide sleeve is mounted in the one-way pipe, and the backwashing mechanism is designed, so that during backwashing, the first valve is closed, then the external connecting pipe is in threaded connection with the one-way pipe, then the collecting pipe is filled with cleaning water, and then the collecting pipe is cleaned, so that the service life of the filter element can be effectively prolonged. 本实用新型涉及一种工程施工用污水净化机构，包括伸缩套和集合管，集合管安装在伸缩套上，所述伸缩套上设置有反冲洗机构和双路机构，所述反冲洗