I-portal scaffold ingenye yezikafula ezisetshenziswa kakhulu ekwakheni.Ngenxa yokuthi ifreyimu eyinhloko isesimweni "somnyango", ibizwa ngokuthi i-portal noma i-portal scaffold, eyaziwa nangokuthi ifremu yokhozi noma i-gantry.Lolu hlobo lwesikafula lwakhiwe ikakhulukazi uhlaka oluyinhloko, ifreyimu eyisiphambano, i-cross diagonal brace, ibhodi lesikafula, isisekelo esilungisekayo, njll.

I-portal scaffold ingenye yezikafula ezisetshenziswa kakhulu ekwakheni.Ngenxa yokuthi ifreyimu eyinhloko isesimweni "somnyango", ibizwa ngokuthi i-portal noma i-portal scaffold, eyaziwa nangokuthi ifremu yokhozi noma i-gantry.Lolu hlobo lwesikafula lwakhiwe ngokuyinhloko ifreyimu eyinhloko, ifremu eyisiphambano, ibrace evundlile ene-diagonal, ibhodi lesikafula, isisekelo esilungisekayo, njll. Isikafula sephothali iyithuluzi lokwakha elasungulwa yi-United States ngasekupheleni kweminyaka yawo-1950.Ngenxa yokuthi inezinzuzo zokuhlanganisa nokuhlakazeka okulula, ukunyakaza okulula, umthamo omuhle wokuthwala, ukusetshenziswa okuphephile nokuthembekile kanye nezinzuzo ezinhle zezomnotho, ithuthuke ngokushesha.Ngawo-1960, iYurophu, iJapane namanye amazwe ayesethule futhi athuthukisa lolu hlobo lwe-scaffold.EYurophu, eJapane nakwamanye amazwe, ukusetshenziswa kwe-portal scaffold kukhulu kakhulu, kubala cishe amaphesenti angu-50 azo zonke izinhlobo ze-scaffolds, futhi izinkampani eziningi eziqeqeshiwe ezikhiqiza izikafula ze-portal zezinhlelo ezihlukahlukene ziye zasungulwa emazweni ahlukahlukene.

Kusukela ngawo-1970, i-China iye yathula ngokulandelana uhlelo lwe-portal scaffold oluvela eJapane, e-United States, eBrithani nakwamanye amazwe, oluye lwasetshenziswa ekwakhiweni kwezinye izakhiwo eziphakeme futhi bathola imiphumela emihle.Ingasetshenziswa hhayi kuphela njengama-scaffolds angaphakathi nangaphandle ekwakhiweni kwesakhiwo, kodwa futhi njenge-floor slab, ukusekelwa kwe-beam formwork kanye ne-scaffold yeselula.Inemisebenzi eminingi, ngakho-ke ibizwa nangokuthi i-scaffold enemisebenzi eminingi.

Ngasekuqaleni kwawo-1980, abanye basekhaya nabakhiqizi baqala ukulingisa isikafula se-portal.Kuze kube ngu-1985, abakhiqizi be-scaffold portal abayi-10 basungulwe ngokulandelana.I-portal scaffold iye yathandwa kakhulu futhi yasetshenziswa kumaphrojekthi wokwakha kwezinye izindawo, futhi yamukelwe amayunithi okwakha aseGuangda.Nokho, ngenxa yokucaciswa kwemikhiqizo ehlukene kanye namazinga ekhwalithi emboni ngayinye, kuletha ubunzima obuthile ekusetshenzisweni nasekuphathweni kweyunithi yokwakha.Lokhu kube nomthelela omkhulu ekuthuthukisweni kwalobu buchwepheshe obusha.

Ngawo-1990, lolu hlobo lwesikafula lwalungakathuthukisiwe futhi lwaluncipha ngokusetshenziswa ekwakheni.Amafekthri amaningi e-gantry scaffold avalwa noma ashintshelwa ekukhiqizeni, futhi amayunithi ambalwa kuphela anekhwalithi enhle yokucubungula aqhubeka nokukhiqiza.Ngakho-ke, kuyadingeka ukuthuthukisa uhlobo olusha lwe-portal tripod ngokuhlanganiswa nezici zezakhiwo zezwe lethu.