1. Suav GB 50kg / m rail qhov corrosion kuj yog dab tsi, thiab yuav ua li cas txhim kho rau hauv av metro kab?
The base Chinese GB 50kg/m rail (used in metro systems) has moderate corrosion resistance, with a plain carbon steel surface that's prone to rust in damp underground environments (humidity >80%, condensation ntawm phab ntsa qhov). Txhawm rau txhim kho nws cov kav ntev, ob qho kev ntsuas tseem ceeb yog siv:
Epoxy txheej: Tag nrho cov tsheb ciav hlau (lub taub hau, lub vev xaib, hauv paus) yog coated nrog 0.2-0.3mm tuab epoxy txheej, uas ua raws li kev tiv thaiv kev ya raws thiab chloride ions (los ntawm deicing ntsev nqa mus rau hauv qhov av los ntawm tsheb ciav hlau). Qhov no txo qis tus nqi corrosion los ntawm 90% piv rau uncoated rails -txuas GB 50kg / m lub neej kev pabcuam hauv metros los ntawm 15 txog 25 xyoo.
Cathodic tiv thaiv: Nyob rau hauv ntug dej hiav txwv metro kab (piv txwv li, Shenzhen Metro, qhov twg seawater vapor infiltrates tunnels), ib tug cathodic tiv thaiv system yog ntxiv: titanium anodes raug ntsia raws tus khiav, thiab ib tug low-voltage tam sim no yog siv rau txoj kev tsheb ciav hlau, tiv thaiv hlau oxidation (xeb).
Piv txwv li, Beijing Metro's Line 10 siv epoxy-coated GB 50kg/m rails; Tom qab 12 xyoo ntawm kev ua haujlwm, qhov tob corrosion yog<0.1mm-far below the 0.5mm threshold for replacement. These enhancements are critical, as underground corrosion can weaken the rail web and base, risking structural failure.
2. Qhov txawv ntawm "rail fatigue life" thiab "rail service life", thiab lawv sib tshooj li cas rau UIC 60?
Rail qaug zog lub neej yog hais txog tus naj npawb ntawm lub tsheb ciav hlau hla txoj kev tsheb ciav hlau tuaj yeem tiv taus ua ntej tsim cov kab nrib pleb tseem ceeb (Ntau dua lossis sib npaug li 5 hli), thaum lub caij tsheb ciav hlau lub neej yog tag nrho lub sijhawm cov tsheb ciav hlau tseem nyob hauv txoj kev ua ntej hloov (vim hnav, qaug zog, lossis corrosion). Rau UIC 60 rails, ob qhov kev ntsuas no sib tshooj tab sis tsis zoo ib yam:
Nthuav lub neej: UIC 60 muaj lub neej qaug zog ntawm ~ 100–150 lab tag nrho cov tons (MGT) ntawm kev khiav tsheb (sib npaug rau 50,000–75,000 kis ntawm 20t qag tsheb ciav hlau). Qhov no yog txiav txim siab los ntawm kev kuaj sim (cyclic dabtsi yog khoov kev nyuaj siab) thiab cov ntaub ntawv teb - ib zaug kev tsheb khiav dhau qhov pib, qhov qaug zog tawg ua ntau.
Kev pab lub neej: UIC 60 lub neej kev pab cuam yog 15-25 xyoo, nyob ntawm qhov ceev ceev. Nyob rau hauv siab - cov kab tsheb khiav (xws li, 100 tsheb ciav hlau / hnub, 20t qag), lub neej qaug zog tau mus txog hauv ~ 15 xyoo (120 MGT), yog li lub neej kev pabcuam raug txwv los ntawm kev qaug zog. Nyob rau hauv qis- cov tsheb ciav hlau nyob deb nroog (10 tsheb ciav hlau / hnub), lub neej qaug zog tshaj 25 xyoo, yog li kev pabcuam lub neej yog txiav txim siab los ntawm kev hnav (thaum hnav lub taub hau tshaj 3 hli).
Qhov sib tshooj tshwm sim nyob rau hauv nruab nrab- cov kab tsheb (30-50 tsheb ciav hlau / hnub): UIC 60 lub neej qaug zog thiab hnav lub neej ob qho tib si tas li nyob ib ncig ntawm 20 xyoo, yog li kev hloov pauv tau teem sijhawm los daws ob qho kev pheej hmoo.
3. Dab tsi yog "rail sib tsoo qauv," thiab vim li cas nws txawv rau nkhaus thiab ncaj seem ntawm CRTS 300N?
Rail sib tsoo qauv yog hais txog txoj kev tshwj xeeb abrasive log tshem tawm cov khoom ntawm lub taub hau tsheb ciav hlau los kho nws cov profile- kho kom haum rau cov qauv hnav tshwj xeeb ntawm nkhaus thiab ncaj nraim. Rau CRTS 300N siab- cov tsheb ciav hlau ceev, cov qauv sib txawv:
Ncaj nraim: Hnav yog ib yam thoob plaws lub taub hau tsheb ciav hlau (feem ntau flatting ntawm qhov chaw khiav). Cov qauv sib tsoo siv qhov "tag nrho-profile" dhau, tshem tawm 0.2-0.5mm ntawm cov khoom sib npaug los kho qhov qub 75mm dav thiab 32mm qhov siab. Qhov no ua kom lub log sib txuas thiab tsis muaj suab nrov ntawm 350 km / h.
Khoov ntu: Hnav tsis sib xws - hnyav hnyav tshwm sim ntawm sab hauv lub tsheb ciav hlau qhov ntsuas lub kaum ntse ntse (los ntawm lub log flange tiv tauj) thiab sab nrauv tsheb ciav hlau sab (los ntawm lub zog centrifugal thawb lub log sab nraud). Cov qauv sib tsoo ntawm no yog "asymmetric":
Sab hauv rail: Cov khoom siv ntxiv raug tshem tawm ntawm lub kaum ntse ntse (0.5-0.8mm) kom du lub ntug hnav thiab txo flange kev sib txhuam.
Sab nrauv rail: Ntau cov khoom siv hauv av los ntawm sab teb (0.3-0.6mm) los kho qhov nkhaus profile thiab sib npaug tiv thaiv kev ntxhov siab.
Kev siv tus qauv tsis raug (xws li, puv -profile ntawm nkhaus rails) yuav ua rau hnav tsis sib xws, ua kom muaj kev vibration thiab txo CRTS 300N lub neej kev pab cuam. Rail sib tsoo tshuab yog programmed nrog cov ntaub ntawv geometry (curvature, radius) los siv cov qauv raug.
4. American AREMA 115RE rail lub hauv paus dav yog dab tsi, thiab yuav ua li cas txhim kho kev ruaj ntseg ntawm cov ntoo pw tsaug zog?
AREMA 115RE muaj lub hauv paus dav ntawm 152mm (6 ntiv tes), qhov kev xaiv tsim tau zoo rau kev ruaj ntseg ntawm cov ntoo pw tsaug zog- feem ntau hauv North American cheeb tsam thiab ceg kab. Qhov dav no txhim kho kev ruaj ntseg hauv ob txoj hauv kev tseem ceeb:
Ntxiv qhov chaw sib cuag: Lub hauv paus 152mm kis tau tus kab mob hnyav (57kg / m) tshaj ib feem loj ntawm cov ntoo pw tsaug zog (feem ntau yog 200mm dav), txo qhov siab ntawm cov ntoo los ntawm 380kPa mus rau 285kPa. Qhov no tiv thaiv tus neeg tsaug zog los ntawm "crushing" (tsim indentations) nyob rau hauv txoj kev tsheb ciav hlau, uas yuav ua rau txoj kev tsheb ciav hlau hloov mus thiab misalign.
Zoo dua fastener anchorage: Cov neeg pw tsaug zog ntoo siv dev spikes los yog lag screws kom ruaj rau txoj kev tsheb ciav hlau. Lub hauv paus 152mm muab ntau qhov chaw rau fasteners (spikes yog muab tso rau 25mm los ntawm lub hauv paus ntug), kom ntseeg tau ib tug muaj zog tuav uas resists lateral txav (xws li, los ntawm lub tsheb ciav hlau sway ntawm nkhaus). Hauv qhov sib piv, lub hauv paus nqaim (piv txwv li, 140mm) yuav xav tau spikes kom ze rau ntawm ntug, pheej hmoo rau kev pw tsaug zog.
Piv txwv li, ntawm cov kab nyob deb nroog hauv Montana siv AREMA 115RE thiab cov ntoo pw tsaug zog, lub hauv paus 152mm tau khaws cov ntsuas ntsuas hauv ± 1 hli rau 12 xyoo- nyob ruaj khov dua li txoj kab nqaim, uas yuav tsum tau hloov kho txhua xyoo.
5. European UIC 54 kev tsheb ciav hlau lub taub hau qhov siab yog dab tsi, thiab nws cuam tshuam li cas rau lub log - kev tsheb ciav hlau sib cuag rau qis - tsheb ciav hlau ceev?
UIC 54 muaj lub taub hau kev tsheb ciav hlau qhov siab ntawm 132 hli (los ntawm lub hauv paus mus rau saum lub taub hau), qhov loj me uas haum rau qis- cov tsheb ciav hlau ceev (tsawg dua lossis sib npaug li 100 km / h) feem ntau nyob rau hauv cov kab nyob deb nroog thiab cov chaw ua haujlwm. Lub taub hau qhov siab no cuam tshuam rau lub log- kev tsheb ciav hlau sib cuag hauv ob txoj kev muaj txiaj ntsig:
Qhov nruab nrab ntawm lub ntiajteb txawj nqus: Lub taub hau qhov siab 132 hli (vs. UIC 60's 140mm) txo qis ntawm txoj kev tsheb ciav hlau qhov chaw ntawm lub ntiajteb txawj nqus, txo qis kev ruaj ntseg thaum qis - cov tsheb ciav hlau ceev (nrog aerodynamic stability tsawg) dhau. Qhov no txo qis kev tsheb ciav hlau "wobble" thiab ua rau lub log sib txuas rau ntawm lub taub hau, txo qis hnav ntawm lub kaum ntse ntse.
Sib piv qis -ceev log profiles: Tsawg- tsheb ciav hlau ceev (piv txwv li, European lub cheeb tsam diesel tsheb ciav hlau) siv cov log nrog qhov tob tob flange (28mm vs. 32mm rau siab- lub log ceev). UIC 54's 132mm lub taub hau qhov siab sib haum nrog qhov flange qhov tob, ua kom lub log flange tsuas yog hu rau lub tsheb ciav hlau qhov ntsuas lub kaum sab xis thaum lub sijhawm tig ceev- zam kev hnav tsis tsim nyog ntawm cov ntu ncaj.
Yog tias qhov qis- kab nrawm siv UIC 60 (140mm lub taub hau qhov siab), lub taub hau siab dua yuav ua rau lub log flange rub lub kaum ntse ntse txawm nyob rau ntawm txoj kab ncaj nraim, ua kom hnav thiab ua kom nrov nrov. UIC 54 lub taub hau qhov siab yog li ua kom zoo rau kev sib cuag rau qis -kev ua haujlwm ceev.