Screw ya chini, inayojulikana kama nanga za helical, piers, nanga za screw au screw pilessy, ni mfumo wa kisasa wa msingi, unaotumia mashine ya kuchimba visima kusakinisha ambayo inafanya kuwa suluhisho bora zaidi na la kuokoa gharama.
Wao huzalishwa kwa matumizi ya ukubwa tofauti wa sehemu za mashimo ya tubular kwa shimoni ya nanga.Sehemu hizo zinaweza kuwa na shimoni thabiti la baa ya mraba au shimoni yenye mashimo ya tubula na sahani za helical zilizounganishwa kwake.Mirundo ya helical tubular, hata hivyo, imekuwa mirundo ya kawaida ya helical.
Kutokana na vipimo vya kubuni na urahisi wa ufungaji wa nanga za helical, hutumiwa zaidi wakati hali ya udongo haifai ufumbuzi wa msingi wa kawaida.Shaft ya nanga hufanya kazi ya mzigo wa muundo kuhamisha kwenye piles.Sahani za chuma za rundo la helical zina svetsade kwenye shimoni la nanga ili kuendana na hali ya udongo.
Ni aina ya rundo la kuchimba visima na nguvu ya juu ya kukamata bila kujali ardhi, kama vile udongo wa mchanga, kinamasi na ardhi huru.Kulingana na uimara wake bora na uthabiti, skrubu ya ardhini inaweza kutumika kwa aina nyingi za matumizi, kama vile mfumo wa jua;ujenzi wa timer-fram;mifumo ya matangazo na trafiki;bustani ya mijini na ujenzi wa mazingira;nguzo za bendera na kadhalika.
Ground Parafujo F mfululizo | Dimension | Bamba | ||
| A | B | C | Unene |
mm | mm | mm | mm | |
70 | 76 | 1200 | 3 | |
70 | 76 | 1600 | 3 | |
70 | 76 | 1800 | 3 | |
68.5 | 76 | 2000 | 3.75 | |
68.5 | 76 | 2500 | 3.75 | |
68.5 | 76 | 3000 | 3.75 | |
81.7 | 88.9 | 1200 | 3.6 | |
81.7 | 88.9 | 1600 | 3.6 | |
81.4 | 88.9 | 2000 | 3.75 | |
81.4 | 88.9 | 2500 | 3.75 | |
81.4 | 88.9 | 3000 | 3.75 | |
108 | 114 | 1200 | 3 | |
108 | 114 | 1600 | 3 | |
108 | 114 | 1800 | 3 | |
108 | 114 | 2000 | 3 | |
106.5 | 114 | 2500 | 3.75 | |
106.5 | 114 | 3000 | 3.75 | |
157.1 | 168.3 | 2608 | 5.6 | |
206 | 219 | 2700 | 6.5 | |
206 | 219 | 2700 | 6.5 | |
206 | 219 | 3500 | 6.5 | |
206 | 219 | 3500 | 6.5 |
Ground Parafujo N mfululizo | Dimension | Bamba | ||
A | B | L | Unene | |
mm | mm | mm | mm | |
57 | 60 | 550 | 1.5 | |
60 | 65 | 800 | 2.5 | |
60 | 65 | 1000 | 2.5 | |
60 | 65 | 1200 | 2.5 | |
59 | 65 | 1600 | 3 | |
59 | 65 | 1800 | 3 | |
64.5 | 67.5 | 560 | 1.5 | |
64.5 | 67.5 | 580 | 1.5 | |
64.3 | 67.5 | 700 | 1.7 | |
64.3 | 67.5 | 800 | 1.7 | |
71 | 76 | 800 | 2.5 | |
71 | 76 | 1000 | 2.5 | |
71 | 76 | 1200 | 2.5 | |
70 | 76 | 1600 | 3 | |
70 | 76 | 1800 | 3 | |
69 | 76 | 2000 | 3.5 | |
82.9 | 88.9 | 800 | 3 | |
82.9 | 88.9 | 1000 | 3 | |
81.4 | 88.9 | 2000 | 3.75 | |
81.4 | 88.9 | 2500 | 3.75 | |
81.4 | 88.9 | 3000 | 3.75 |
Mfululizo wa Ground Parafujo U | Dimension | Bamba | |||
| A | B | C | L | Unene |
mm | mm | mm | mm | mm | |
71 | 67 | 130 | 565 | 1.7 | |
71 | 67 | 130 | 735 | 1.7 | |
91 | 68 | 130 | 550 | 1.7 | |
91 | 68 | 130 | 555 | 1.7 | |
91 | 67 | 130 | 735 | 1.7 | |
91 | 67 | 130 | 870 | 2 | |
101 | 67 | 130 | 735 | 1.7 | |
101 | 67 | 130 | 870 | 2 |