Txoj kev guardrails feem ntau muab faib ua cov guardrails hloov tau, semi-rigid guardrails thiab rigid guardrails. Flexible guardrails feem ntau xa mus rau cable guardrails, rigid guardrails feem ntau xa mus rau cement qhob guardrails, thiab semi-rigid guardrails feem ntau xa mus rau beam guardrails. Beam laj kab guardrails yog cov qauv kab teeb tsa nrog cov ncej, tso siab rau qhov khoov deformation thiab nro ntawm tus neeg saib xyuas kom tiv thaiv tsheb sib tsoo. Beam guardrails muaj qee yam rigidity thiab toughness, thiab nqus lub zog sib tsoo los ntawm kev deformation ntawm crossbeam. Nws cov khoom puas yog ib qho yooj yim los hloov, muaj ib qho kev pom kev induction, tuaj yeem ua haujlwm nrog txoj kab ntawm txoj kab, thiab muaj qhov zoo nkauj zoo nkauj. Ntawm lawv, corrugated beam guardrail yog siv dav hauv tsev thiab txawv teb chaws hauv xyoo tas los no. Rau qhov dav.
1. Cov hauv paus ntsiab lus ntawm kev teeb tsa kev tiv thaiv kev tsheb
Txoj kev guardrails feem ntau muab faib ua ob hom: embankment guardrails thiab obstacle guardrails. Qhov tsawg kawg nkaus qhov ntev ntawm txoj kev yog 70 meters. Thaum qhov kev ncua deb ntawm ob seem ntawm cov guardrails tsawg tshaj li 100 meters, nws yog advisable kom teem lawv tsis tu ncua ntawm ob seem. Lub laj kab guardrail yog sandwiched ntawm ob seem filling. Cov seem excavation nrog ib tug ntev ntawm tsawg tshaj li 100 meters yuav tsum tau tas mus li nrog cov guardrails ntawm lub filling seem ntawm ob qho tag nrho. Nyob rau hauv kev tsim ntawm txoj kev guardrails, guardrails yuav tsum tau teem yog hais tias ib yam ntawm cov nram qab no tej yam kev mob raug:
A. Cov ntu uas txoj kev txoj kab nqes i thiab qhov siab ntawm embankment h yog nyob rau hauv qhov ntxoov ntxoo ntawm daim duab 1.
B. Cov ntu sib tshuam nrog txoj kev tsheb ciav hlau thiab txoj kev loj, uas cov tsheb muaj Tshooj uas lub tsheb yuav poob rau ntawm txoj kev tsheb ciav hlau sib tshuam lossis lwm txoj kev.
C. Cov ntu uas muaj cov dej ntws, pas dej, hiav txwv, dej ntws thiab lwm yam dej tsis pub dhau 1.0 meters ntawm ko taw ntawm txoj kev taug kev ntawm txoj kev loj lossis thawj-chav tsheb rau tsheb, thiab qhov chaw tsheb yuav muaj kev phom sij heev yog tias lawv poob rau hauv lawv.
D. Daim duab peb sab ntawm qhov nkag thiab tawm ramps ntawm kev sib tshuam ntawm txoj kev nthuav dav thiab sab nraud ntawm lub vojvoog me me ntawm cov ramps.
2. Txoj kev guardrails yuav tsum tau muab ntsia rau hauv ib qho xwm txheej hauv qab no:
A. Cov ntu uas txoj kev nqes hav i thiab qhov siab ntawm embankment h yog nyob saum kab dotted hauv daim duab 1.
B. Cov ntu uas txoj kev nqes hav i thiab qhov siab ntawm qhov siab h yog nyob rau hauv 1.0 meters ntawm ntug ntawm lub ntiaj teb lub xub pwg nyom ntawm txoj kev loj los yog thawj-chav kawm txoj kev tsheb Shanghai epoxy pem teb, thaum muaj cov qauv xws li gantry lug, xov tooj xwm ceev, piers los yog abutments ntawm overpasses.
C. Parallel mus rau railways thiab highways, uas cov tsheb yuav tawg mus rau hauv cov kev tsheb ciav hlau nyob ib sab los yog lwm txoj kev loj.
D. Cov ntu me me uas qhov dav ntawm txoj kev hloov pauv.
E. Cov seem uas lub vojvoog nkhaus tsawg dua qhov tsawg kawg nkaus lub vojvoog.
F. Ceev hloov txoj kab khiav ntawm cov chaw pabcuam, chaw nres tsheb lossis chaw nres tsheb npav, thiab cov seem suav nrog hauv cov duab peb sab uas cov laj kab thiab cov neeg saib xyuas faib thiab sib koom ua ke.
G. Kev sib txuas ntawm qhov kawg ntawm qhov kawg ntawm cov choj loj, nruab nrab thiab me me los yog qhov kawg ntawm cov txheej txheem siab thiab cov kab hauv kev.
H. Qhov twg yog qhov tsim nyog los teeb tsa kev tiv thaiv ntawm cov Islands tuaj txawv teb chaws thiab cov Islands tuaj sib cais.
Post lub sij hawm: Aug-12-2024