ASTM A252 Qib 1 steel yeeb nkab muaj feem xyuam rau cov yeeb nkab pawg nrog lub npe (nruab nrab) phab ntsa steel lub tog raj kheej ua haujlwm ua haujlwm ruaj khov- nqa khoom lossis ua lub plhaub los tsim cov ntaub ntawv- hauv - qhov chaw pob zeb. American Standard ASTM A252 yog cov yeeb nkab piling khoom tus qauv uas feem ntau siv hauv kev tsim kho thiab cov qauv tsim.
Deg flaws uas ntau tshaj 25% ntawm qhov tob ntawm nominal phab ntsa yog hu ua defects. Vuam tuaj yeem siv los kho qhov tsis xws luag uas tsawg dua 22.5 feem pua ntawm nominal phab ntsa qhov tob. Qhov tsis xws luag yuav tsum tau tshem tawm tag nrho ua ntej vuam.
Specification ntawm ASTM A252 Qib 1
| Txuj | A252 |
| Specification | Welded Steel Yeeb Nkab Piles |
| Hom | Hluav taws xob Resistance Welded (ERW) |
| Loj | NPS 1 TO NPS 24 [DN25 rau DN 600], nrog nominal nruab nrab phab ntsa tuab raws li muab hauv ASME B 36.10M lossis raws li tus neeg siv khoom xav tau. |
| Sab nraud | 1-24 nti (33.4-609.6mm) |
| Thickness | 3-12 hli |
| Ntev | Min 3 M, Max18 M, los yog raws li tus neeg yuav tsum tau muaj. |
| Xaus | Qhov loj me me yog dawb, qhov loj me yog beveled, los yog raws li tus neeg yuav tsum tau muaj |
| Kev kho saum npoo | Feem ntau liab qab los yog dub kua roj vanish |
| Ntim | Qhov loj me me hauv qab 219.1mm hauv pob khoom, qhov loj me hauv ntau |
| Kev sim | Tshuaj muaj pes tsawg leeg, ntsuas kub, ntsuas khoom, Tensile Requirements, thiab lwm yam raws li tus neeg yuav tsum tau muaj. |
Tshuaj muaj pes tsawg leeg ntawm ASTM A252 Qib 1 Steel Piling Pipe
Kev tshuaj xyuas tshuaj yog ib feem tseem ceeb ntawm cov txheej txheem thaum xaj ASTM A252 Qib 1 steel kav. Kev tshuaj xyuas tshuaj yuav tsum tau ua raws li cov qauv kev sim, kev coj ua, thiab cov lus qhia hauv ASTM A751. Txhawm rau kom ntseeg tau qhov tseeb, tus neeg yuav khoom muaj cai ua cov khoom lag luam tshuaj xyuas siv ob qho qauv los ntawm txhua qhov cua sov ntau ntawm cov yeeb nkab. Txoj kev no, txhua qhov teeb meem muaj peev xwm tuaj yeem txheeb xyuas thiab kho ua ntej cov kav dej yuav raug siv. Los ntawm kev ua kom ntseeg tau tias cov txheej txheem raug ua raws, nws muaj peev xwm xaj ASTM A252 Qib 1 cov kav hlau nrog kev ntseeg siab, paub tias lawv yuav ua tau raws li cov qauv xav tau.
Mechanical Properties ntawm ASTM A252 Qib 1 Piling yeeb nkab
ASTM A252 Qib 1 cov kav dej yuav tsum muaj zog txaus los tiv thaiv cov rog uas tau teev tseg hauv cov lus hauv qab no. Qhov taw tes tawm los yog qhov taw tes uas cov khoom pib deform mus tas li hauv kev thauj khoom. Nws feem ntau yog ntsuas los ntawm kev poob ntawm lub nqaj, los ntawm kev nres hauv qhov ntsuas ntawm lub tshuab ntsuas, lossis los ntawm lwm txoj kev pom zoo. Yog hais tias qhov tseeb cov ntsiab lus tsis tau nthuav tawm, lub zog tawm los sib haum rau 0.2% offset ntawm qhov ntev ntawm cov qauv, lossis 0.5% tag nrho txuas ntxiv ntawm qhov ntev ntawm qhov load, yuav tsum txiav txim siab hloov. Cov kev cai no xyuas kom meej tias cov khoom yuav muaj peev xwm ua tau raws li nws qhov kev xav tau yam tsis muaj deforming ntau dhau los ntawm kev ntxhov siab.
- Tensile Requirements
| NorE 1–Qhov twg ib qho ellipsis (…) tshwm hauv cov lus no, tsis tas yuav tsum muaj. | ||||
|---|---|---|---|---|
| Tensile zog, min, psi [MPa] | Qib 1 | Qib 2 | Qib 3 | |
| Tawm taw tes lossis tawm lub zog, min, psi [MPa] | 50 000[345] | 60 000[415] | 60 000[455] | |
| Basic yam tsawg kawg nkaus elongation rau nominal phab ntsa thicknesses % nyob rau hauv. [7.9 mm] los yog ntau tshaj: | 30 000[205] | 35 000[240] | 45 000[310] | |
| Elongation hauv 8 hauv [2032 mm] min, % | 18 | 14 | – | |
| Elongation hauv 2 hauv.[50.8 mm] min.% | 30 | 25 | 20 | |
| Rau nominal phab ntsa thicknesses tsawg tshaj li 5/16 nyob rau hauv.[7.9 mm], txiav tawm los ntawm qhov yooj yim yam tsawg kawg nkaus elongation nyob rau hauv 2 in. [50.8 mm] rau txhua 1/32 – nyob rau hauv.[0.8 mm] txo nyob rau hauv nominal phab ntsa thickness hauv qab nominal thickness hauv qab 5/16 nyob rau hauv. [7.9 mm], nyob rau hauv feem pua cov ntsiab lus | 1.5A | 1.25A | 1.0A | |
| A Table 2 muab cov txiaj ntsig yam tsawg kawg nkaus suav nrog: | ||||
- Tsawg kawg elongations
| Nominal Phab Ntsa Thickness | Elongation hauv 2 hauv [50.8mm], min,% | |||
|---|---|---|---|---|
| hauv. | mm | Qib 1 | Qib 2 | Qib 3 |
| 5/16 los yog 0.312 | 7.9 | 30.00 | 25.00 | 20.00 |
| 9/32 los yog 0.281 | 7.1 | 28.50 | 23.75 | 19.00 |
| 1/4 0r 0.250 | 6.4 | 27.00 | 22.50 | 18.00 |
| 7/32 los yog 0.219 | 5.6 | 25.50 | 21.25 | 17.00 |
| 3/16 los yog 0.188 | 4.8 | 24.00 | 20.00 | 16.00 |
| 11/64 los yog 0.172 | 4.4 | 23.25 | 19.50 | 15.50 |
| 5/32 los yog 0.156 | 4.0 | 22.50 | 18.75 | 15.00 |
| 9/64 los yog 0.141 | 3.6 | 21.75 | 18.25 | 14.50 |
| 1/8 los yog 0.125 | 3.2 | 21.00 | 17.50 | 14.00 |
| 7/64 los yog 0.109 | 2.8 | 20.25 | 16.75 | 13.50 |
| A Cov lus saum toj no aives xam qhov tsawg kawg nkaus elongaton qhov tseem ceeb rau varous nominal phab ntsa thicknesses. Qhov twg qhov tshwj xeeb nomina phab ntsa thickness yog nruab nrab rau cov uas qhia saum toj no, qhov tsawg kawg nkaus elongation tus nqi yuav tsum tau txiav txim raws li hauv qab no: | ||||
| Qib | ||||
| 1 | E = 48t + 15.00[E = 1.90t +15.00] | |||
| 2 | E = 40t + 12.50[E = 1.56t +12.50] | |||
| 3 | E = 32t + 10.00[E = 1.25t +10.00] | |||
| qhov twg: | ||||
| E=elongation hauv 2 hauv..% thiab | ||||
| t=specofoed nominal phab ntsa thickness. hauv [mm]. | ||||
Daim ntawv thov ntawm ASTM A252 Qib 1 Piling Piping
ASTM A252 Qib 1 piling kav feem ntau siv rau txoj kab uas hla loj thiab cov qauv siv, xws li kev tsim vaj tsev thiab choj. Txoj kab uas hla loj pab faib qhov hnyav ntawm cov qauv sib npaug, thaum lub siab - cov ntaub ntawv zoo siv hauv cov kav dej kom ntseeg tau tias lawv tuaj yeem tiv taus cov ntsiab lus.
Tsis tas li ntawd, kev tsim kho cov kav dej khov kho no ua rau lawv zoo tagnrho rau kev siv hauv thaj chaw uas muaj av qeeg lossis lwm yam kev puas tsuaj ntuj tsim. Raws li qhov tshwm sim, ASTM A252 Qib 1 piling kav yog ib qho tseem ceeb ntawm ntau qhov kev tsim kho loj.
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