Portal scaffold yog ib qho ntawm cov scaffolds siv dav tshaj plaws hauv kev tsim kho. Vim tias lub thav duab tseem ceeb yog nyob rau hauv daim ntawv ntawm "qhov rooj", nws yog hu ua portal lossis portal scaffold, tseem hu ua Eagle frame lossis gantry. Hom scaffold no feem ntau yog tsim los ntawm lub thav duab tseem ceeb, cross frame, cross diagonal brace, scaffold board, adjustable base, thiab lwm yam.

Portal scaffold yog ib qho ntawm cov scaffolds siv dav tshaj plaws hauv kev tsim kho. Vim tias lub thav duab tseem ceeb yog nyob rau hauv daim ntawv ntawm "qhov rooj", nws hu ua portal lossis portal scaffold, tseem hu ua Eagle thav duab lossis gantry. Hom scaffold no feem ntau yog tsim los ntawm lub thav duab tseem ceeb, cross frame, cross diagonal brace, scaffold board, adjustable base, thiab lwm yam. Portal scaffold yog ib qho cuab yeej tsim kho thawj zaug tsim los ntawm Tebchaws Meskas thaum xyoo 1950s. Vim tias nws muaj qhov zoo ntawm kev sib dhos yooj yim thiab disassembly, kev txav mus los yooj yim, muaj peev xwm nqa tau zoo, kev siv nyab xeeb thiab txhim khu kev qha thiab cov txiaj ntsig zoo rau kev lag luam, nws tau tsim kho sai. Los ntawm xyoo 1960s, Tebchaws Europe, Nyiv Pooj thiab lwm lub tebchaws tau ua tiav kev qhia thiab tsim hom scaffold no. Hauv Tebchaws Europe, Nyiv Pooj thiab lwm lub tebchaws, kev siv portal scaffold yog qhov loj tshaj plaws, suav txog li 50% ntawm txhua hom scaffolds, thiab ntau lub tuam txhab kev tshaj lij tsim portal scaffolds ntawm ntau yam systems tau tsim nyob rau hauv ntau lub tebchaws.

Txij li xyoo 1970, Tuam Tshoj tau tsim cov portal scaffolding system los ntawm Nyiv Pooj, Tebchaws Meskas, Tebchaws Askiv thiab lwm lub tebchaws, uas tau siv rau hauv kev tsim kho qee lub tsev siab thiab tau txais txiaj ntsig zoo. Nws tsis yog tsuas yog siv tau ua cov scaffolds sab hauv thiab sab nraud rau kev tsim kho xwb, tab sis kuj siv ua cov floor slab, beam formwork support thiab mobile scaffold. Nws muaj ntau yam haujlwm, yog li nws tseem hu ua multi-functional scaffold.

Los ntawm thaum ntxov xyoo 1980, qee lub tuam txhab hauv tsev thiab cov chaw tsim khoom tau pib ua raws li lub portal scaffold. Txog xyoo 1985, 10 lub tuam txhab tsim khoom portal scaffold tau tsim tsa ua ntu zus. Lub portal scaffold tau nrov npe thiab siv rau hauv cov haujlwm tsim kho hauv qee thaj chaw, thiab tau txais tos los ntawm cov chaw tsim kho ntawm Guangda. Txawm li cas los xij, vim yog cov khoom sib txawv thiab cov qauv zoo ntawm txhua lub Hoobkas, nws coj qee qhov teeb meem rau kev siv thiab kev tswj hwm ntawm chav tsev tsim kho. Qhov no tau cuam tshuam loj heev rau kev txhawb nqa cov thev naus laus zis tshiab no.

Los ntawm xyoo 1990, hom scaffold no tsis tau tsim thiab siv tsawg dua hauv kev tsim kho. Ntau lub Hoobkas scaffold gantry tau kaw lossis hloov mus rau kev tsim khoom, thiab tsuas yog ob peb chav nrog kev ua haujlwm zoo txuas ntxiv tsim khoom. Yog li ntawd, nws yog qhov tsim nyog los tsim ib hom tshiab ntawm lub rooj vag tripod ua ke nrog cov yam ntxwv ntawm peb lub tebchaws.