Cirewa ruwa shine muhimmin aikin injiniyari na geotechnical wanda ke cire ruwan ƙasa daga gidajen gine-gine, tono, da yankunan ayyukan gini don kirkirar yanayi mara ruwa da tabkashi don shigar da gindin gida, ayyukan piling, da ayyukan tabbatar da ƙasa. A cikin ayyukan gine-ginen ƙasa, musamman waɗanda ke da alaƙa da gindin gida, pile driving, da ayyukan inganta ƙasa, sarrafa matakan ruwa ƙasa shine muhimmin don riƙe tabkashi na ƙasa, hana tashin ƙasa, rage matsanancin matsi, da tabbatar da muhalli mai aminci ga ma'aikata da na'ura. Cirewa ruwa ya zama muhimmin musamman a cikin ƙasashen da ke da ruwa, yankunan da ke da teburin ruwa mai tsayi, da gidajen gine-gine inda ruwan sama ko kusa da ruwan saman jiki zai iya cutar da ingancin gini da ƙarfin gini.
Dewatering na wellpoint shi ne hanyar kawar da ruwa ta muhimmi wacce ake amfani da ita a cikin gina ƙasa mai zurfi da ayyukan injiniyan geotechnical inda ake buƙatar rage teburin ruwa na wucin gadi. Hanyar ta amfani da jerin rami na ƙaramin diamita, yawanci 50-100mm, an shigar da su a zurfin zurfi don kawar da ruwan ƙasa daga yankin aikin gina. Tsarin wellpoint ya ƙunshi ramuka na ɗaya-ɗaya da aka haɗa ta hanyar pipes na header zuwa na'urar pumping ta tsakiya, wanda ke haifar da hanyar daidaita kawar da ruwa. Hanyar ta musamman amfani a cikin ayyukan piling, gini caisson, tono basement, da ayyukan underpinning inda zurfin tono ya wuce teburin ruwa na asali ko inda canjin ruwan ƙasa na lokaci na bazara ke barazana ga amincin gidan da amincin ma'aikata.
Tsarin eductor da ejector well sun wakilci dewatering na musamman wanda ke da mahimmanci ga gina ƙasa mai zurfi da ayyukan tabbatar da ƙasa inda hanyoyin kawar da ruwa na al'ada suka bayyana maras fa'ida ko maras tattalin arziƙi. Waɗannan tsarin sun amfani da jet na ruwa mai matsin lamba ko iska mai matsin lamba don kawar da ƙasa ƙarƙashin ruwa da kawar da ruwa daga cikin ramu. Ka'idojin eductor sun amsa ta hanyar tura ruwa mai matsin lamba ta hanyar nozzles na musamman wanda ke haifar da yankuna na matsin lamba ƙasa, wanda ke jawo ruwan ƙasa da ƙasa mai ɗaukar ƙasa zuwa sama da fita daga ramu. Wannan aikin biyu ya sa tsarin eductor well ya zama muhimmi ga ayyukan da ke buƙatar kawar da ƙasa da kawar da ruwa a lokaci guda a cikin yanayin geotechnical mara tabbas.
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