Chigadziko chePortal ndechimwe chezvigadziko zvinoshandiswa zvakanyanya mukuvaka. Nekuti furemu huru ine chimiro che "gonhi", inonzi portal kana portal scaffold, inozivikanwawo seEagle frame kana gantry. Rudzi urwu rwechigadziko runonyanya kuumbwa nefuremu huru, furemu yakachinjika, cross diagonal brace, scaffold board, adjustable base, nezvimwewo.

Chivharo chePortal ndechimwe chezvivharo zvinoshandiswa zvakanyanya mukuvaka. Nekuti furemu huru iri muchimiro che "gonhi", inonzi portal kana portal scaffold, inozivikanwawo seEagle frame kana gantry. Rudzi urwu rwechivharo runonyanya kuumbwa nefuremu huru, furemu yakachinjika, cross diagonal brace, scaffold board, adjustable base, nezvimwewo. Chivharo chePortal chishandiso chekuvaka chakatanga kugadzirwa neUnited States mukupera kwema1950. Nekuti chine mabhenefiti ekubatanidza nekuputsa zviri nyore, kufamba kuri nyore, kugona kubata zvakanaka, kushandiswa kwakachengeteka uye kwakavimbika uye mabhenefiti akanaka ehupfumi, chakakura nekukurumidza. Pakazosvika kuma1960, Europe, Japan nedzimwe nyika dzakatanga nekugadzira rudzi urwu rwechivharo zvakatevedzana. MuEurope, Japan nedzimwe nyika, kushandiswa kwechivharo cheportal ndicho chikuru, chichiita 50% yemarudzi ese echivharo, uye makambani mazhinji ehunyanzvi anogadzira zvivharo zveportal zvemasisitimu akasiyana-siyana akatangwa munyika dzakasiyana-siyana.

Kubva kuma1970, China yakaunza nzira yekuisa ma "portal scaffold" kubva kuJapan, United States, Britain nedzimwe nyika, iyo yakashandiswa mukuvaka dzimwe dzimba refu uye yakawana mhedzisiro yakanaka. Inogona kushandiswa kwete chete se "scaffolds" dzemukati nedzekunze dzekuvaka zvivakwa, asiwo se "floor slab", "beam formwork support" uye "mobile scaffold". Ine mabasa akawanda, saka inonziwo "multi-functional scaffold".

Pakutanga kwema1980, vamwe vevashandi vemumba nevagadziri vakatanga kutevedzera scaffold yeportal. Kusvika muna 1985, vagadziri gumi veportal scaffold vakatangwa vachitevedzana. Portal scaffold yave ichifarirwa zvikuru uye ichishandiswa mumapurojekiti ekuvaka mune dzimwe nzvimbo, uye yakagamuchirwa nemayuniti ekuvaka eGuangda. Zvisinei, nekuda kwezvakasiyana zvezvigadzirwa uye mwero wemhando yefekitori yega yega, zvinounza mamwe matambudziko pakushandiswa nekutarisira unit yekuvaka. Izvi zvakakanganisa zvakanyanya kusimudzirwa kwetekinoroji iyi itsva.

Pakazosvika makore ekuma1990, rudzi urwu rwema "scaffold" rwakanga rusati rwagadzirwa uye rwakanga rusingachashandiswi zvakanyanya pakuvaka. Mafekitori mazhinji ema "gantry scaffold" akavharwa kana kuti akachinjwa kuita zvekugadzira, uye mayuniti mashoma chete ane mhando yakanaka yekugadzirisa akaramba achigadzira. Nokudaro, zvakakosha kugadzira rudzi rutsva rwe "portal tripod" pamwe chete nehunhu hwekuvaka hwenyika yedu.