Pre-stressed steel hlau thiab rebar (txhim kho bar) yog ob qho tib si siv nyob rau hauv kev tsim kho kev lag luam los txhawb cov pob zeb, tab sis lawv ua hauj lwm sib txawv thiab siv nyob rau hauv ntau txoj kev:
Pre-stressed Hlau Hlau:
Pre-stressed steel hlau yog siv nyob rau hauv prestressed pob zeb, qhov twg cov hlau yog tensioned ua ntej lub pob zeb yog poured. Cov txheej txheem no ua rau muaj txiaj ntsig zoo hauv lub zog tsim los txo qhov tsis muaj zog ntawm cov pob zeb hauv nro 563 566.
Nws feem ntau yog siv rau hauv cov ntawv thov uas xav tau lub zog tensile siab, xws li hauv cov txuas hniav, kab teeb loj, thiab lwm cov qauv uas xav tau ntev dua yam tsis muaj kev txhawb nqa hauv nruab nrab.
Rebar (Kev txhawb nqa Bar):
Rebar yog siv rau hauv cov pob zeb uas muaj zog thiab muab tso rau hauv cov pob zeb tom qab nws tau nchuav lawm. Nws muab lub zog tensile rau cov pob zeb, uas yog qhov tseem ceeb vim cov pob zeb tsis muaj zog tensile ntawm nws tus kheej 564 565.
Rebar feem ntau yog siv nyob rau hauv ntau yam kev tsim kho, nrog rau cov tsev, txuas hniav, thiab lwm yam kev txhawb nqa uas xav tau los tiv thaiv qhov nro thiab compression rog.
Qhov sib txawv tseem ceeb ntawm pre-stressed steel hlau thiab rebar yog:
Lub Sijhawm Tensioning: Pre-stressed steel hlau yog tensioned ua ntej lub pob zeb yog cam khwb cia (pre-tensioning) los yog tom qab nws tau teem tab sis ua ntej tus qauv yog loaded (post-tensioning), thaum rebar yog muab tso rau thiab tensioned tom qab lub pob zeb yog poured.
Lub hom phiaj: Pre-stressed steel hlau yog siv los tsim compression nyob rau hauv lub pob zeb los tiv thaiv lub zog tensile, txo lub sij hawm ntawm cracking thiab ua kom cov txheej txheem kev ncaj ncees. Rebar, ntawm qhov tod tes, yog siv los txhawb cov pob zeb thiab muab lub zog tensile ntxiv thaum tus qauv thauj khoom.
Daim ntawv thov: Pre-stressed steel hlau feem ntau yog siv nyob rau hauv cov qauv uas yuav tsum tau ntev spans, thaum rebar yog feem ntau siv nyob rau hauv kev tsim kho rau ntau yam kev siv.
Ob qho khoom siv yog qhov tseem ceeb hauv kev tsim kho kev lag luam, muab lub zog thiab hloov tau yooj yim rau cov vaj tse pob zeb, tab sis lawv raug xaiv raws li cov kev cai tshwj xeeb ntawm qhov project ntawm tes.
