1. Suav GB 60kg / m rail qhov nruab nrab qhov kub thiab txias yog dab tsi, thiab nws hloov kho li cas rau thaj chaw kub thiab txias?
GB 60kg / m (Tuam Tshoj tus qauv siab- kev tsheb ciav hlau ceev) muaj qhov nruab nrab kub ntawm 28-35 degree, kho los ntawm huab cua: 1.Cov cheeb tsam kub (South China, 35-40℃lub caij ntuj sov): Muab tso rau ntawm 32-35℃kom txo tau kev ntxhov siab los ntawm thermal expansion- tiv thaiv buckling . 2.Cov cheeb tsam txias (Northeast Tuam Tshoj, -20--10℃lub caij ntuj no): Muab tso rau ntawm 28-30℃kom txo qis tensile kev nyuaj siab los ntawm contraction - zam kev tawg . 3.Temperate regions (East China): Teem rau 30-32 degree, ntsuas qhov kub ntawm lub caij hloov pauv. Cov neeg ua haujlwm siv cov ntsuas kub infrared kom paub meej tias kev tsheb ciav hlau kub thaum lub sijhawm teeb tsa, ua kom muaj kev sib haum xeeb nrog lub cheeb tsam nruab nrab kub. Piv txwv li, ntawm Beijing-Shanghai High-Speed Railway (kub), GB 60kg / m yog pw ntawm 30 degree, thaum nyob rau ntawm Guangzhou-Shenzhen kab (kub), nws tau teem rau 33℃.
2. "Rail magnetic particle testing" yog dab tsi, thiab yog vim li cas nws yog ib qho tseem ceeb rau hnyav -haul rails zoo li AREMA 132RE?
Kev ntsuam xyuas cov khoom sib nqus (MPT) siv cov khoom sib nqus thiab cov hlau oxide los kuaj xyuas qhov chaw thiab ze rau - qhov chaw tsis xws luag (sib cais, suav nrog) hauv cov ntsia hlau. Rau hnyav- tsheb ciav hlau zoo li AREMA 132RE (35t axles), nws yog qhov tseem ceeb vim tias: 1.Kev kuaj pom tsis raug: Txheeb xyuas cov kab nrib pleb me me (0.1 hli tob) pom tsis pom ntawm qhov muag liab qab- axles hnyav ua kom cov kab nrib pleb ua tsis tiav . 2.Tsis yog -kev puas tsuaj: Kev ntsuam xyuas cov tsheb ciav hlau yam tsis muaj kev puas tsuaj rau lawv, tsis zoo li cov qauv kev puas tsuaj . 3.Ceev: Scans rails ntawm 5km / h, npog 10km ntawm kev taug qab ib hnub. MPT ua tiav txhua 6 lub hlis ntawm AREMA 132RE rails; Yog tias pom muaj qhov tsis xws luag, ntu yog hauv av lossis hloov. Yog tsis muaj MPT, cov kab nrib pleb zais cia tuaj yeem ua rau txoj kev tsheb ciav hlau tawg thiab derailment -tshwj xeeb yog txaus ntshai rau cov tsheb thauj khoom hnyav.
3. European UIC 54 txoj kev tsheb ciav hlau lub neej kev pab cuam nyob rau hauv cov kab nyob deb nroog yog dab tsi, thiab nws txuas ntxiv mus li cas?
UIC 54 muaj 20-25 xyoo kev pab cuam nyob rau hauv cov kab nyob deb nroog (tsawg tsheb thauj mus los: 5-10 tsheb ciav hlau / hnub). Qhov no txuas ntxiv los ntawm: 1.Kev tshuaj xyuas tsis tu ncua: Tshawb xyuas qhov hnav / tawg txhua 12 lub hlis- kuaj pom thaum ntxov ntxiv 5 xyoos. 2.Lub teeb sib tsoo: Tshem tawm 0.5mm ntawm qhov chaw hnav txhua txhua 3-5 xyoos, rov kho qhov profile. 3.Kev saib xyuas ballast: Tamping ballast kom ruaj ruaj, txo kev ntxhov siab ntawm UIC 54. 4.Axle load tswj: Kev txwv kev khiav tsheb tsawg dua lossis sib npaug li 18t axles (vs. 20t) kom qeeb qaug zog. Piv txwv li, txoj kab UIC 54 nyob deb nroog hauv Fab Kis (10 lub tsheb ciav hlau / hnub) tau siv sijhawm 28 xyoo nrog kev saib xyuas kom raug- ob npaug lub neej ntawm txoj kab tsis zoo.
4. Qhov txawv ntawm "rail web cracking" thiab "rail head cracking," thiab lawv kho li cas?
Rail web cracking tshwm sim nyob rau hauv txoj kev tsheb ciav hlau txoj kab ntsug (10-15mm los ntawm lub taub hau), tshwm sim los ntawm ntau tensile kev nyuaj siab (xws li, txias contraction). Rail taub hau tawg yog nyob rau hauv lub taub hau (nto los yog subsurface), los ntawm hnav, qaug zog, los yog cuam tshuam. Kev kho qhov txawv: 1.Web cracking: Cov kab nrib pleb me me (<5mm) are sealed with epoxy; larger cracks require cutting out the affected rail section and welding a new segment-web cracks can't be ground. 2. Lub taub hau tawg: Nto tawg (<2mm) are removed by grinding; deeper cracks (>2mm) xav tau kev hloov tsheb ciav hlau. Lub taub hau tawg yog ntau dua (kho los ntawm kev sib tsoo 80% ntawm lub sijhawm), thaum lub vev xaib tawg tsis tshua muaj tab sis hnyav dua - tsis quav ntsej lub vev xaib tawg ua rau kev tsheb ciav hlau tawg.
5. Dab tsi yog American AREMA 132RE rail daim ntawv thov nyob rau hauv cov thee thauj kab, thiab dab tsi ua rau nws haum?
AREMA 132RE yog thawj txoj kev tsheb ciav hlau rau North American coal thauj kab (piv txwv li, Union Pacific txoj kev thee) vim nws: 1.Siab zog: 862MPa tensile lub zog tuav 35t thee tsheb ciav hlau qag, txo kev ntxhov siab kom tsawg dua lossis sib npaug li 650MPa. 2.Lub taub hau tawv: 340-400HB lub taub hau tiv thaiv abrasive thee hmoov av, txiav hnav los ntawm 50%. 3.Lub cev tawv: 280HB core absorbs cuam tshuam los ntawm cov tsheb thauj khoom, tiv thaiv kev tawg . 4.Thermal stability: Ua kom muaj kev ncaj ncees nyob rau hauv qhov kub thiab txias (-30℃txog 40 degree), tseem ceeb heev rau kev hla - lub teb chaws coal txoj kev. AREMA 132RE kav ntev li 25-30 xyoo hauv cov kab hluav taws xob, txawm tias muaj 50+ tsheb ciav hlau/hnub-ob zaug ntev npaum li cov qauv tsheb ciav hlau.