Izitolo zesihlongwane (helical piles), ezikhokhwa nangezitolo zesiphakamiso ezihlongwane noma izakhi zesizinda ezihlongwane, ziyigata yesikhali enesikhwizela sesisodwa noma ngaphezulu esiguqula umhlaba uma ichotshazwa elomhlabeni. Lezi ziyingxenye yesizinda ezihlanganisa izimiso zesistimu yezitolo nenqubo yokubekwa elakhe olulula. Isakhiwo sesichakachazo sichothshaza umhlaba onqumayo njengoba igata ichotshazwa, ilungisela ezungu futhi yenza amandla okuzimu ngephutha lomhlanganiso-unco (end-bearing) ne-skin friction. Ivamile iyenziwe ngamatubu esikhali eliphezulu enesikhwizela esingenziwe noma esilungiswe, izitolo zesihlongwane zinendlela enziwe, amandla okugoba amancane (low corrosion susceptibility) uma isilaywe (galvanized), nalokho okushintshayo okusisikali, okuwenza zifanele kakhulu emiphakathini enezinkinga lapho izitolo eziqalwe noma ezibhalwe zethulula izikhalo noma umsindo.
Izitolo zesihlongwane (helical piles), ezikhokhwa nangezitolo zesiphakamiso ezihlongwane noma izakhi zesizinda ezihlongwane, ziyigata yesikhali enesikhwizela sesisodwa noma ngaphezulu esiguqula umhlaba uma ichotshazwa elomhlabeni. Lezi ziyingxenye yesizinda ezihlanganisa izimiso zesistimu yezitolo nenqubo yokubekwa elakhe olulula. Isakhiwo sesichakachazo sichothshaza umhlaba onqumayo njengoba igata ichotshazwa, ilungisela ezungu futhi yenza amandla okuzimu ngephutha lomhlanganiso-unco (end-bearing) ne-skin friction. Ivamile iyenziwe ngamatubu esikhali eliphezulu enesikhwizela esingenziwe noma esilungiswe, izitolo zesihlongwane zinendlela enziwe, amandla okugoba amancane (low corrosion susceptibility) uma isilaywe (galvanized), nalokho okushintshayo okusisikali, okuwenza zifanele kakhulu emiphakathini enezinkinga lapho izitolo eziqalwe noma ezibhalwe zethulula izikhalo noma umsindo.
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