Siffar siffa ɗaya ce daga cikin ɓangarorin da aka fi amfani da su wajen aikin ginin.
Sauƙaƙan taro da rarrabawa, kyakkyawan aiki mai ɗaukar nauyi.
Kamar yadda babban firam ɗin ya kasance na nau'in "ƙofa", ana kiransa portal ko portal scaffolding, wanda kuma ake kira scaffold ko gantry.
Wannan al'adar ta ƙunshi babban firam, firam ɗin kwance, katakon katako na giciye, katako, tushe mai daidaitacce, da makamantansu.
Kasar Amurka ce ta fara samar da tarkacen kofar.
Yana da halaye na haɗuwa mai sauƙi da rarrabuwa, kyakkyawan aiki mai ɗaukar nauyi, aminci da ingantaccen amfani, da dai sauransu.
Gudun ci gaba yana da sauri sosai.
Ƙofar ƙofa wani tsari ne na asali wanda ya haɗa da firam ɗin kofa, goyon bayan giciye, sandar haɗi, katako mai rataye nau'in katako na katako ko firam ɗin kwance, hannun kulle, da dai sauransu, sannan kuma an ba da shi tare da sanda mai ƙarfi a kwance, goyan bayan almakashi, sandar share fage, sandar rufewa, sandar katako da tushe.
Ana ɗaukar madaidaicin ƙirar bututun ƙarfe da aka haɗa tare da babban tsarin ginin.
Za a iya amfani da sikelin karfe na Portal ba kawai a matsayin ƙwanƙwasa na waje ba, amma har ma a matsayin ƙwanƙwasa na ciki ko cikakken zane.
1. Ana amfani dashi don tallafawa babban firam a cikin hanyar gini, zauren, gada, viaduct, rami, da sauransu.
2. A matsayin babban gini a ciki da wajen grid scaffolding.
3. Matakan aiki masu aiki don shigarwa na lantarki, gyaran gyare-gyare da sauran ayyukan gyare-gyare.
4. Ta hanyar yin amfani da ɓangarorin portal da truss mai sauƙi, za a iya gina wuraren zama na wucin gadi, ɗakunan ajiya ko rumbuna.
5. Ana amfani da shi don saita tsayawar agogon wucin gadi da tsayawa.
A halin yanzu, akwai mutane da yawa masu fasaha da ke kula da wurin ginin, kuma babu cikakken bayani game da fasahar aminci ga masu aiki.
Baya ga rashin ingancin wasu ma'aikata, matsalolin aikace-aikacen ba za a iya kaucewa ba.
Idan rushewar tsarin aiki ya haifar da ma'aikaci ba ya saita tazara na takalmin gyaran kafa ko a kwance da kuma kwancen igiya bisa ga buƙatun ƙira, kwanciyar hankali na aikin bai isa ba; wasu hadurran na faruwa ne sakamakon ma'aikacin ya tarwatsa sandar da ke hade tsakanin tarkacen waje da ginin.
Sakamakon rugujewar ginin gaba daya ya haifar da hadurruka inda tarin kayan gini, na'urorin da aka kera ko na'urorin gini suka taru a kan tarkace da na'urorin gini, lamarin da ya haifar da rashin kwanciyar hankali da kuma haddasa rugujewar gaba daya.
Sabili da haka, gudanar da aikin ginin yana da rudani kuma masu aiki ba su shigar da kuma rushe tallafin ba daidai da ka'idodin ƙira, wanda kuma shine dalili mai mahimmanci na rushewar hadarin.
