In pretensioning, cov hlau yog ncab ua ntej lub pob zeb muab tso. High-strength steel tendons yog muab tso rau ntawm ob abutments thiab stretched mus rau 70 mus rau 80 feem pua ntawm lawv qhov kawg lub zog. Qhob yog nchuav rau hauv pwm nyob ib ncig ntawm cov leeg thiab tso cai rau kho.
Yuav ua li cas cov kab hluav taws xob ua tau zoo?
Pretensioning muab lwm txoj hauv kev los prestress lub pob zeb. Nyob rau hauv pretensioning, lub pob zeb yog poured nyob ib ncig ntawm lub twb-tensioned cables thiab tso cai rau harden thiab tuav cov cables nyob rau hauv qhov chawThaum cov pob zeb yog khov thiab kho, qhov kawg ntawm tensioned cables raug txiav thiab qhov nro yog tso rau hauv kab los yog slab.
Yuav ua li cas yog 2 txoj kev tsim cov pob zeb ua ntej kev nyuaj siab?
Muaj ob txoj hauv kev ntawm prestressing:
Pre-tensioning: Thov prestress rau steel strands ua ntej casting qhob; Post-tensioning: Siv prestress rau steel leeg tom qab casting pob zeb.
Dab tsi yog cov khoom siv hauv kev tsim cov pob zeb prestressed?
Steel thiab qhob yog cov khoom siv hauv kev tsim cov pob zeb prestressed.
- Siv cov pob zeb muaj zog ua tau zoo hauv cov ntu me.
- High lub zog pob zeb muaj kev ua haujlwm siab hauv kev nro, shear, daim ntawv cog lus thiab cov kabmob.
- Tsawg poob ntawm prestress tshwm sim nrog cov pob zeb muaj zog.
Yuav ua li cas thiaj ua tiav?
Prestressing yog qhov kev taw qhia ntawm lub zog compressive rau pob zeb los tiv thaiv cov kev ntxhov siab uas yuav tshwm sim los ntawm kev siv lub nra. Qhov no yog ua los ntawm tso siab tensile steel tendons nyob rau hauv ib tug xav profile nyob rau hauv uas lub pob zeb yuav tsum tau cam khwb cia. …
