Ntev -Lub Sijhawm cuam tshuam ntawm Interlayer Gaps hauv Ballastless Track Structure ntawm Fastener Stress
Q1: Qhov sib txawv interlayer feem ntau tsim nyob rau hauv ballastless lem thiab dab tsi yog qhov kev loj hlob yam ntxwv?
A1: Interlayer gaps feem ntau tsim ntawm ob qhov sib cuam tshuam: ib qho nruab nrab ntawm cov kab khiav slab thiab lub hauv paus slab los ntawm cov txheej txheem mortar, thiab lwm qhov ntawm lub hauv paus slab thiab hauv paus hauv paus. Thawj qhov khoob yog me me, tshwm sim los ntawm qhov kub thiab txias thiab pob zeb shrinkage; nyob rau hauv rov qab tsheb ciav hlau thauj khoom, qhov khoob maj mam nthuav dav thiab nkag mus rau hauv qhov chaw tsis muaj chaw seem. Gap txoj kev loj hlob muaj cov yam ntxwv ntawm lub cev thiab qhov chaw, ua kom nrawm rau lub caij kub thiab qis. Rainwater intrusion ntxiv txhawb kev sib tshuam tev, nce qhov sib txawv qhov tob thiab ntev.
Q2: Ua li cas hauv zos interlayer qhov sib txawv hloov txoj kev ntxhov siab thiab qib ntawm fasteners?
A2: Raws li ib txwm muaj, lub tsheb ciav hlau thauj khoom sib npaug sib kis los ntawm cov fasteners nrog cov kev ntxhov siab maj mam faib. Tom qab qhov sib txawv tsim, hauv zos khiav slab deflection hauv qab load ua rau muaj kev hloov pauv sai sai hauv kev txhawb nqa fastener. Fasteners saum qhov khoob dais instantaneous concentrated impact load nrog sharply nce ntsug kev nyuaj siab; Cov fasteners uas nyob ib sab ua rau muaj kev ntxhov siab tshem tawm, ua kom tawv nqaij hloov pauv. Qhov kev hloov pauv kev ntxhov siab no cuam tshuam cov clips thiab bolts kom ntev - lub sij hawm overload, ua rau muaj kev puas tsuaj loj heev.
Q3: Vim li cas qhov kub thiab txias hloov ua rau lub zog hnyav ntxiv rau qhov muaj qhov khoob?
A3: Cov txheej txheem txheej txheem muaj qhov sib txawv ntawm qhov kub thiab txias deformation yam ntxwv. Kev sib raug zoo ua kom muaj kev sib koom tes deformation; Qhov sib txawv tsis muaj zog ntawm interlayer restraint, ua rau tsis sib xws thermal expansion thiab contraction thiab txheeb ze hloov chaw. Qhov kev hloov pauv no tau xa mus rau cov fasteners, imposing ntxiv dabtsi yog khoov -torsion kev nyuaj siab ntawm clips thiab nro-shear stress on bolts. Hauv qhov sib txawv ntawm qhov kub thiab txias, qhov superposition ntawm thermal stress thiab dynamic load tuaj yeem tshaj qhov tsim kev ntxhov siab ncov.
Q4: Dab tsi irreversible fastener thiab taug qab kab mob yog induced los ntawm ntev -lub sij hawm interlayer gaps?
A4: Rau fasteners: tas mus li clip deformation, qaug zog tawg los yog tawg; nquag bolt loosening; hauv zos pad crushing thiab tearing; lub tes tsho looseness vim kev nyuaj siab concentration. Rau cov qauv: taug qab slab kaum cracking, mortar crushing thiab puag slab puas; taug qab geometry irregularities nyuaj rau rov qab. Kev txhim kho qhov sib txawv tsis tu ncua tuaj yeem rhuav tshem cov kab slab kev nyuaj siab thiab ua rau muaj kev nyab xeeb tag nrho ntawm cov qauv.
Q5: Kev ntsuas kev kho mob dab tsi tiv thaiv lub kaw lus fastener tiv thaiv interlayer khoob?
A5: Rau cov qhov khoob me me, siab -siab grouting nrog epoxy mortar los yog polyurethane tuaj yeem sau qhov khoob thiab rov ua dua interlayer bonding. Rau qhov khoob loj lossis cov mortar uas raug puas ntsoog, lub zos chiseling thiab recasting yog yuav tsum tau. Lub caij no, ntxiv dag zog rau cov kua dej kom tsis txhob muaj dej nag nkag; optimize torque retightening thiab tsom rau fasteners saum qhov khoob; txhim kho lub log-rail kev sib cuag los ntawm rail sib tsoo kom txo tau qhov cuam tshuam. Rau cov qauv sib txawv los ntawm lub hauv paus kev daws teeb meem, ntxiv dag zog rau lub hauv paus ua ntej kom tshem tawm qhov txawv txav fastener kev nyuaj siab fundamentally.