I-Portal scaffold yenye yezona scaffolds ezisetyenziswa kakhulu kulwakhiwo. Ngenxa yokuba isakhelo esiphambili sikwimo "yomnyango", ibizwa ngokuba yi-portal okanye i-scaffold portal, eyaziwa ngokuba yi-Eagle frame okanye i-gantry. Olu hlobo lwe-scaffold luqulunqwe ikakhulu ngesakhelo esiphambili, isakhelo esinqamlezayo, ibrace ye-diagonal enqamlezayo, ibhodi yesikafula, isiseko esilungelelanisiweyo, njl.

I-Portal scaffold yenye yezona scaffolds ezisetyenziswa kakhulu kulwakhiwo. Ngenxa yokuba isakhelo esiphambili sikwimo "yomnyango", ibizwa ngokuba yi-portal okanye i-scaffold portal, eyaziwa ngokuba yi-Eagle frame okanye i-gantry. Olu hlobo lwe-scaffold luqulunqwe ikakhulu ngesakhelo esiphambili, isakhelo esinqamlezileyo, isikhonkwane se-diagonal esinqamlezayo, ibhodi yesikafula, isiseko esihlengahlengiswayo, njl. njl. Isikafula sePortal sisixhobo sokwakha esaphuhliswa okokuqala yi-United States ngasekupheleni kweminyaka yoo-1950. Ngenxa yokuba ineenzuzo zokuhlanganisana okulula kunye nokuchithwa, ukunyakaza okufanelekileyo, amandla okuthwala kakuhle, ukusetyenziswa okukhuselekileyo nokuthembekileyo kunye neenzuzo ezilungileyo zezoqoqosho, ziye zaphuhliswa ngokukhawuleza. Ngeminyaka yoo-1960, iYurophu, iJapan kunye namanye amazwe baye bazisa ngokulandelelana kwaye baphuhlisa olu hlobo lwesikafula. EYurophu, eJapan nakwamanye amazwe, ukusetyenziswa kwe-scaffold ye-portal yeyona inkulu, ibalwa malunga ne-50% yazo zonke iintlobo ze-scaffolds, kwaye iinkampani ezininzi zeengcali ezivelisa i-portal scaffolds zeenkqubo ezahlukeneyo ziye zasekwa kumazwe ahlukeneyo.

Ukusukela ngeminyaka yee-1970s, iChina iye yazisa ngokulandelelana inkqubo ye-portal scaffold evela eJapan, eUnited States, eBritani nakwamanye amazwe, esetyenziswe ekwakhiweni kwezinye izakhiwo eziphakamileyo kwaye yafumana iziphumo ezilungileyo. Ayinakusetyenziswa kuphela njenge-scaffolds yangaphakathi nangaphandle yokwakhiwa kwesakhiwo, kodwa kunye ne-floor slab, inkxaso ye-beam formwork kunye ne-scaffold ehambayo. Inemisebenzi emininzi, ngoko ikwabizwa ngokuba sisikafula esinemisebenzi emininzi.

Ekuqaleni kweminyaka yee-1980, abanye basekhaya kunye nabavelisi baqala ukuxelisa i-scaffold portal. Ukuza kuthi ga ngo-1985, abavelisi be-portal scaffold abali-10 baye basekwa ngokulandelelanayo. I-scaffold ye-portal iye yaziwa ngokubanzi kwaye yasetyenziswa kwiiprojekthi zokwakha kwezinye iindawo, kwaye yamkelwe ngamacandelo okwakha e-Guangda. Nangona kunjalo, ngenxa yeenkcazo ezahlukeneyo zemveliso kunye nemigangatho yomgangatho wefektri nganye, kuzisa ubunzima bokusebenzisa kunye nolawulo lweyunithi yokwakha. Oku kuchaphazele kakhulu ukukhuthazwa kobu buchwepheshe butsha.

Ngeminyaka yee-1990, olu hlobo lwesikafula lwalungekaphuhliswa kwaye lwaluncipha ngokusetyenziswa ekwakheni. Iifektri ezininzi ze-gantry scaffold zavalwa okanye zatshintshelwa kwimveliso, kwaye zimbalwa kuphela iiyunithi ezinomgangatho olungileyo wokuqhubekeka ziqhubekile nokuvelisa. Ngoko ke, kuyimfuneko ukuphuhlisa uhlobo olutsha lwe-portal tripod ngokudibanisa neempawu zakhiwo zelizwe lethu.