Menene Prestressed Concrete

(Mene ne Prestressed Concrete)

Menene Concrete Prestressed?

Prestressed Concrete wani nau'in siminti ne wanda aka fi amfani dashi a aikin injiniyan gini da injiniyan gada.

Don kauce wa fashewar da ba a kai ba a cikin sifofin simintin da aka ƙarfafa, yi cikakken amfani da sandunan ƙarfe masu ƙarfi da ƙarfe mai ƙarfi, da kuma ƙoƙarin rage ƙarancin ƙarfi da abubuwan haɗin ke haifarwa ta hanyar amfani da sojojin waje kafin simintin simintin ko abubuwan haɗin gwiwa suna ƙarƙashin nauyin sabis, har ma a cikin yanayin damuwa. Kankare abubuwa suna ƙasa.

Yadda Prestressed Concrete Aiki

Ana amfani da danniya na pre-compression don ragewa ko rage yawan damuwa na Concrete da ke haifar da kaya, don sarrafa damuwa na gyare-gyaren tsarin zuwa karamin yanki, har ma a cikin yanayin da aka matsa, don jinkirta bayyanar da ci gaba da fashewar simintin, don haka inganta juriya na sassan. Crack yi da taurin kai.

Amfanin Kankare Prestressed

1. Kyakkyawan juriya mai tsayi da tsayi mai tsayi. Saboda prestressing na sassan, bayyanar fashe yana da jinkiri sosai. Ƙarƙashin aikin nauyin, abubuwan da aka gyara bazai bayyana ba, ko kuma raguwa na iya jinkirta, don haka an inganta ƙullun kayan aiki, kuma ƙarfin tsarin yana ƙaruwa.

2. Ajiye kayan kuma rage nauyin kai. Saboda tsarinsa dole ne ya yi amfani da kayan aiki masu ƙarfi, zai iya rage adadin sandunan ƙarfe da girman ɓangaren sassan, adana ƙarfe da Kankare, da rage girman kai na tsarin, wanda ke da fa'ida a bayyane ga manyan kayan aiki masu nauyi.

3. Zai iya rage ƙarfin juzu'i na tsaye da damuwa na farko na katako na kankare. Ƙarfafawa mai lanƙwasa (daurin) na katakon simintin da aka riga aka ɗora na iya rage ƙarfin juzu'i na tsaye kusa da goyan baya a cikin katako. Saboda kasancewar prestress akan sashin siminti, babban damuwa mai ƙarfi a ƙarƙashin kaya shima yana raguwa. Wannan yana da fa'ida don rage kaurin gidan yanar gizo na katako ta yadda za a iya ƙara rage nauyin kai na katako mai mahimmanci.

4. Inganta kwanciyar hankali na abubuwan haɗin gwiwa. Lokacin da memba na matsawa yana da ɗan tsayi kuma siriri, yana da sauƙi a lanƙwasa bayan samun wani matsa lamba, yana haifar da asarar kwanciyar hankali da lalacewa. Idan prestressing aka shafi ƙarfafa kankare shafi sabõda haka, longitudinally jaddada karfe sanduna suna tensioned sosai tam, ba kawai da prestressed karfe sanduna da kansu ba sauki tanƙwara, amma kuma za su iya taimaka kewaye Kankare don inganta ikon tsayayya lankwasawa.

5. Inganta juriyar gajiya na abubuwan da aka gyara. Saboda rebar tare da mai ƙarfi prestress yana da ƙananan canje-canje a cikin damuwa da ke haifar da lodawa ko saukewa yayin matakin amfani. Zai iya inganta ƙarfin gajiya, wanda ke da amfani sosai ga tsarin da ke ɗaukar nauyin nauyi.

6. Ana iya amfani da Prestress azaman hanyar haɗa abubuwan haɗin ginin don haɓaka haɓaka sabbin tsarin da hanyoyin gini don manyan-tsari mai tsayi.

Wasu buƙatun don sandunan ƙarfe da aka riga aka sanyawa:

(1) Ƙarfin ya zama babba. Matsakaicin jujjuyawar sandunan ƙarfe da aka riga aka matsa za su haifar da asarar damuwa daban-daban yayin ƙirƙira da amfani da abubuwan haɗin gwiwa. Jimlar waɗannan asarar na iya kaiwa fiye da 200N/mm² wani lokaci idan ƙarfin karfen da aka yi amfani da shi bai yi girma ba, damuwa da aka kafa yayin tashin hankali zai ma rasa.

(2) Dole ne ya kasance yana da kyau adhesion tare da Kanka. Musamman a cikin hanyar pretensioning, dole ne a sami babban haɗin kai mai ƙarfi tsakanin sandar ƙarfe da aka riga aka ɗora da Kankare. Don wasu waya mai santsi mai ƙarfi mai ƙarfi, dole ne a bi ta hanyar "maki," "matsa lamba," ko "kink" ta yadda zai iya samar da waya na karfe da aka zana, da igiyar karfe, da waya mai kinked don ƙara ƙarfin haɗin gwiwa.

(3) Dole ne a sami isasshen filastik da kyawawan kaddarorin sarrafawa. Mafi girman ƙarfin karfe, ƙananan filastik. Lokacin da filastik na sandar karfe ya yi ƙasa sosai, musamman a ƙarƙashin ƙarancin zafin jiki da yanayin ɗaukar nauyi, karaya mai rauni na iya faruwa. Kyakkyawan aiki yana nufin cewa aikin walda yana da kyau. Lokacin da aka yi amfani da farantin anka mai tayar da hankali, tayar da kan sandar karfe ba ya shafar ainihin kayan aikin injiniya, da sauransu.

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(Mene ne Prestressed Concrete)