ASTM-A252 yog qhov yooj yim tswj hwm kev seamless thiab welded steel kav rau piling lub hom phiaj. Lawv tuaj yeem raug siv los ua cov ris nra lossis cov pob zeb ua vaj tse.
A252 cov kav dej muaj nyob rau hauv peb qib:
Qeb 1 (yam tsawg kawg los lub zog ntawm 30 ksi lossis 207 MPA);
Qeb 2 (yam tsawg kawg vim cov txiaj ntsig zoo ntawm 35 ksi lossis 241 MPA);
Qib 3 (yam tsawg kawg vim muaj zog ntawm 45 ksi lossis 310 mpa).
Qib qib 3 feem ntau yog qib rau cov haujlwm piling.
Cov ntsiab lus piav qhia ntawm Astm A252 Hlau Ciaj Yeeb Nkab Yeeb Nkab Txheem Pawg
Txheej txheem cej luam ntawm tus qauv
The ASTM A252 standard is a standard specification for welded and seamless carbon steel pipe piles developed by the American Society for Testing and Materials (ASTM International). Tus qauv qhia meej hauv kev nthuav dav tus qauv tsim, thiab kev siv cov yeeb nkab steel piles, ua kom muaj kev nyab xeeb, thiab kev nyab xeeb ntawm cov hlau yeeb nkab. Nws yog tsuas yog siv nyob rau hauv Foundation Promips xws li cov tuam tsev thiab cov choj los muab kev txhawb nqa ruaj khov rau cov qauv no.
Cov tau txais daim ntawv thov
ASTM A252 cov qauv siv rau cylindrical nominal (nruab nrab phab ntsa yeeb nkab lossis raws li shooter-hauv-qhov chaw qhob pawg. Lawv feem ntau yog siv hauv cov phiaj xwm hauv paus xws li cov tuam tsev thiab cov choj los muab kev txhawb nqa tsis ruaj khov rau cov qauv no.
Qib Kawm Qib Tus Hlau
Cov yeeb nkab steel piles ntawm cov qauv no tau muab faib ua peb qib kawm raws li qhov muaj zog:
Qib 1: Muaj qee yam muaj zog thiab kev nruj me me, haum rau feem ntau lub hauv paus tsim kev lag luam engineering.
Qeb 2: Lub zog yog siab me dua qib 1, thiab nws tseem tuaj yeem ua tau raws li qhov xav tau ntawm cov hauv paus kev lag luam engineering. Nws yog dav siv nyob rau hauv qee cov haujlwm dog dig nrog cov peev txheej muaj peev xwm ntau.
Qib 3: Nws yog lub siab-muaj zog qib me me cov yeeb nkab pawg, uas tuaj yeem siv rau cov haujlwm muaj zog lossis lub hauv paus tseem ceeb xws li cov dav hlau loj thiab cov choj.
Tshuaj Muaj Tshuaj
Kev tsom xam ntawm cov tshuaj muaj pes tsawg leeg yog qhov tseem ceeb heev rau cov astm A252 steel yeeb nkab piles, thiab kev tsom xam tshuaj yeeb yaj kiab, kev ua haujlwm thiab cov ntsiab lus ntawm Astm A751. Cov ntsiab lus phosphorus hauv cov hlau yuav tsum tsis pub dhau 0.050% los xyuas kom zoo thiab ua tau zoo ntawm cov hlau. Cov neeg yuav khoom tuaj yeem siv 2 qhov qauv los ntawm txhua pob ntawm cov khoom ntsuas tshuaj xyuas kom ntseeg tau tias cov tshuaj lom neeg muaj pes tsawg leeg ua tau raws li qhov yuav tsum tau ua.
Lub ntsiab
Lub ASTM A252 tus qauv kom meej meej stipulates cov ntsuas kev ua haujlwm, kev sib txawv, kev sib txawv ntawm welded steel roj piles hauv Formation Engineering. Txawm hais tias nyob rau hauv cov lus xaiv, kev tsim khoom txheej txheem lossis cov qauv tsim nyog, cov ASTM A252 tus qauv muab cov qauv siv muaj zog thiab kev siv cov hlau yeeb nkab.
