1. Tsis txaus Line Post Tensioning thiab tsis txaus Rail Reinforcement
Ib qho ntawm feem ntau ua rau ib tug xoob saw txuas laj kab yogtensioning tsis tsim nyogntawm cov ntaub raws kab posts. Cov saw txuas mesh yog ahelically raug mob hlau qauvuas tso siab rau qhov sib xwsmechanical nrolos tswj nws cov txheej txheem rigidity. Yog hais tias qhov nro bar tsis ruaj ntseg fastened rau lub davhlau ya nyob twg posts los yog yog hais tias tustigbuckles(stretcher tuav) tsis nruj rau qhov pom zoo tensile load (feem ntau ntawm 1,000-1,500 lbs rau cov qauv hauv tsev mesh), cov ntaub yuav maj mam so, ua rau cov kab rov tav slack.Ntxiv mus, lubsab saum toj rail(feem ntau yog 1⅜ ″ lossis 1⅞ ″ OD galvanized steel yeeb nkab) yuav tsum tau ua ke kom zoo thiab txuas rau txhua kab nrogkev tsheb ciav hlau xausthiabpos caps. Txoj kev tsheb ciav hlau tsis txaus tso cai rau tag nrho lub laj kab vaj huam sib luag los hneev nyob rau hauv cua thauj lossis txawm tias nws qhov hnyav.Pauleen qhov kev pom zoo:Ib txwm siv atuaj nrog tensioning ntaus ntawvlos yog alaj kab stretcher barsiv cov kev nruj nruj ntawm lub davhlau ya nyob twg ncej mus rau lub davhlau ya nyob twg ncej. Xyuas kom tseeb tias cov kab xa tawm tau sib nrug raws li txoj kab uas hla ntawm lub xaim thiab lub mesh qhib (piv txwv li, 2 "los yog 2¼" pob zeb diamond qauv). Rau qhov chaw siab cua, nce lub caij tsheb ciav hlau mus rau ob lub tsheb ciav hlau lossis ntxiv ib qhonruab nrab-rail.2. Substandard Post Embedment thiab Av Settlement
Deformation ntawm lub laj kab txuas txuas feem ntau tshwm simqis dua qib. Lub davhlau ya nyob twg (kawg, ces kaum, thiab rooj vag) posts yuav tsum tau teem nyob rau hauv ib tug pob zeb footing uas mus txog hauv qab no.cov kab dej khov- feem ntau yog qhov tsawg kawg nkaus ntawm 24 "-36" sib sib zog nqus, nyob ntawm cov av hauv zos. Yog tias cov ncej qhov ntiav dhau, lossis yog cov pob zeb sib xyaw nrog cov dej-rau-cement ntau dhau (ua rau lub zog tsis muaj zog), cov ncej yuav qaij nyob rau hauv qhov nro load ntawm lub stretched mesh. Qhov no tilting ncaj qha mus rau hauvdiagonal distortionntawm pob zeb diamond mesh qauv.Ntxiv thiab,backfill kev daws teeb meemnyob ib ncig ntawm cov kab ntawv tsis sib xws tuaj yeem ua rau qhov tsis sib xws ntawm qhov siab, ua rau "yoj" zoo li ntawm kab laj kab.Pauleen qhov kev pom zoo:Sivteem caij 40 galvanized steel ncej(los yog lub sij hawm hnyav dua 80 rau cov ntawv thov kev lag luam). Excavate qhov tsawg kawg yog 3 zaug ntawm txoj kab uas hla ntawm qhov dav thiab 30 "qhov tob rau feem ntau cheeb tsam. Ncuav4000-psi qhob mixnrog rau qhov poob ntawm 4-5 ntiv tes, thiab tso cai rau tag nrho 72-teev curing lub sij hawm ua ntej tensioning cov saw txuas ntaub. Rau cov teeb meem av nplaum lossis cov av xuab zeb, nruab aqhob dab tshoslos yog sivlub tsho tom qab tsav tshebnrog gravel backfill.3. Inconsistent Wire Gauge thiab Zinc Coating Quality – Hidden Defects from Subpar Manufacturing
Txawm tias tsim nyog installation tsis tuaj yeem them raucov khoom tsis sib xwsnyob rau hauv cov saw txuas ntaub nws tus kheej. Tsawg-zoo fencing feem ntau nthuav tawmnon-uniform hlau diameterraws li tib lub yob (piv txwv li, 9-gauge xaim uas hloov pauv ntawm 3.6 hli thiab 3.2 hli). Qhov no ua rausib txawv tensile zog- thinner seem elongate ntau nyob rau hauv nruj, ua rau lub zos bulging los yog "puckering" ntawm pob zeb diamond mesh.Lwm qhov zais cia yogzinc txheej adhesion. Chain txuas hlau yuav tsum ua raws liASTM A 392 Cov Lus Qhia Tshwj Xeeb(rau galvanized steel) los yogASTM F668(rau PVC-coated). Yog tias cov txheej txheem kub-dip galvanizing tsis zoo tswj, flaking los yog txheej tsis sib xws tso cai rau xeb los pib ntawm knuckles (cov xov hlau sib tshuam). Corrosion by-products nthuav, yuam cov pob zeb diamond qauv kom deform thiab poob nws cov duab.Pauleen qhov zoo:Raws li cov chaw tsim khoom tshwj xeeb nrog ntau tshaj 10 xyoo ntawm kev paub, peb nruj me ntsis ua raws liISO 9001 Cov Ntawv Pov Thawjkev tswj kom zoo. Txhua batch ntawm saw txuas ntaub yog kuaj rau:- Lub zog tensile(tsawg kawg 70,000 psi rau cov pa roj carbon tsawg).
- Uniformity ntawm mesh qhib(± 1/16 ″ kam rau ua).
- Zinc txheej hnyav(piv txwv li, 1.8 oz / ft² rau cov khoom hnyav galvanized).
Peb tsis lees txais cov coils uas qhia qhov ntsuas qhov hloov pauv lossis cov txheej txheej nkig. Thaum koj xaiv Pauleen, koj tshem tawm cov khoom cuam tshuam txog deformations nkaus.
Summary & Cov kauj ruam tom ntej
Yog tias koj lub laj kab txuas txuas txuas twb xoob lossis deformed, peb pom zoo kom apeb-point audit:- Check pos huab cuathiab pob zeb footing qhov tob.
- Ntsuas cov ntaub tensionnrog lub ntsuas qhov nro (zoo nyeem ntawv: 180-220 lbs rau 2 "mesh, 9-gauge hlau).
- Tshawb xyuas cov hlau ntorau cov pob txha los yog cov pob txha tsis sib xws.