1. Introduction
W-Beam Guardrails yog lub ntiaj teb kev lees paub kev nyab xeeb kev daws teeb meem, paub txog lawv cov txiaj ntsig hauv kev txo qis kev sib tsoo hnyav thiab lawv hloov tau thoob plaws ntau txoj kev ib puag ncig. Cov tshuab no tau siv dav vim lawv qhov sib npaug ntawm kev ua tau zoo, kev ua haujlwm tau zoo, thiab hloov tau yooj yim. Daim ntawv tshaj tawm no muab kev txheeb xyuas qhov tob ntawm W-Beam Guardrails, suav nrog cov kev qhia tshwj xeeb, cov yam ntxwv ua haujlwm, kev teeb tsa, thiab kev cuam tshuam nyiaj txiag. Lub hom phiaj yog muab cov kws tshaj lij kom nkag siab zoo txog W-Beam system cov txiaj ntsig, kev txwv, thiab kev txhim kho yav tom ntej.
2. Kev qhia tshwj xeeb thiab cov qauv tsim
2.1 W-Beam Profile
Lub W-Beam guardrail qhov tseem ceeb yog nws qhov txawv "W" zoo li, uas pab faib cov kev cuam tshuam rau lub zog thiab tiv thaiv cov tsheb tawm ntawm txoj kev.
- Qhov ntev: Txheem qhov siab ntawm 310 hli nrog qhov tob ntawm 80 hli.
- khoom: Galvanized steel nrog siab durability.
- Yield Muaj ZogUa haujlwm siab: 345-450 MPa.
- Qhov Kawg Lub Zog TausUa haujlwm siab: 483-620 MPa.
- thickness: Feem ntau 2.67 mm (12 gauge) lossis 3.42 mm (10 gauge).
- Galvanization: Kub-dip galvanized nrog txheej tuab ntawm 610 g / m² (AASHTO M180) kom ntseeg tau tias muaj kev tiv thaiv corrosion mus ntev.
2.2 System Cheebtsam
- posts: Ua los ntawm cov ntoo lossis hlau, txhawb nqa txoj kev tsheb nqaj hlau thiab hloov cov kev cuam tshuam rau hauv av.
- Ntoo ncej: 150 mm x 200 mm.
- Hlau ncej: Ntau yam profiles xws li I-beam lossis C-channel.
- Blockouts: Muab qhov tsim nyog offset ntawm cov ncej thiab cov tsheb ciav hlau, pab tswj kev tsheb ciav hlau qhov siab thiab txhim kho lub zog nqus.
- Rail Splices: Overlapped thiab bolted kev sib txuas uas ua kom cov kev tsheb ciav hlau tsis tu ncua.
- Xaus Terminals: Tsim los kom txo qis kev cuam tshuam cov tsheb lossis coj lawv mus kom nyab xeeb.
- Post Spacing: Feem ntau 1.905 meters (6.25 ko taw) rau cov qauv kev teeb tsa.
2.3 Kev txiav txim siab ntawm cov khoom
Cov hlau siv nyob rau hauv W-Beam systems yog xaiv rau nws lub zog siab thiab kav ntev. Nyob rau hauv ib puag ncig nrog huab cua huab cua, tshwj xeeb tshaj yog nyob rau hauv cov cheeb tsam ntug dej hiav txwv uas muaj ntsev ntau, kev siv cov txheej txheem galvanized thiab lwm yam khoom siv corrosion-resistant tuaj yeem ua rau lub neej ntev.
3. Kev Ntsuam Xyuas Kev Ua Haujlwm
3.1 Lub zog nqus tshuab
Lub W-Beam guardrail tus tsim ua rau nws nqus thiab dissipate cuam tshuam lub zog zoo:
- Beam Deformation: W-puab tso cai rau lub tsheb ciav hlau khoov thiab nqus lub zog yam tsis muaj kev tawg.
- Post Yielding: Cov ncej yog tsim los ua kom tawg lossis khoov thaum muaj kev cuam tshuam, txo cov quab yuam hloov mus rau lub tsheb.
- Rail Tension: Lub kaw lus redirects lub tsheb los ntawm kev tswj kom nruj raws li txoj kev tsheb ciav hlau ntev.
- Blockout Compression: Ntxiv dissipates cuam tshuam lub zog los ntawm compressing thiab tswj kev tsheb ciav hlau qhov siab thaum sib tsoo.
Kev tshawb fawb los ntawm Zhang et al. (2023) pom tias W-Beam guardrail tuaj yeem tawg mus txog 55 kJ ntawm lub zog hauv kev sib tsoo nrog tus qauv tsheb thauj neeg.
3.2 Kev Nyab Xeeb Kev Ua Haujlwm
W-Beam Guardrails ua tau raws li ntau yam kev nyab xeeb thoob ntiaj teb:
- MASH TL-3 Certification: Tsim kom muaj thiab hloov cov tsheb hnyav txog li 2,270 kg (5,000 lbs) ntawm 100 km / h thiab 25-degree kaum ntawm kev cuam tshuam.
- EN 1317 N2 Containment Level: Ua kom pom kev ua tau zoo ntawm cov neeg caij tsheb txog li 1,500 kg ntawm 110 km / h thiab lub kaum sab xis ntawm 20 °.
Cov ntaub ntawv sib tsoo tiag tiag hauv ntiaj teb los ntawm Tsoom Fwv Teb Chaws Txoj Kev Loj (2023) qhia txog kev txo qis hauv kev sib tsoo los ntawm 40-50% rau txoj kev tsheb uas muaj W-Beam systems.
4. Kev txhim kho thiab tu
4.1 Txheej txheem installation
Kev txhim kho kom zoo yog qhov tseem ceeb rau kev ua haujlwm ntawm W-Beam guardrails:
- Kev Npaj Kawm Ntawv: Lub cheeb tsam yog graded thiab compacted kom ruaj khov.
- Kev Txhim Kho Tom Qab: Cov ntawv tuaj yeem raug tsav mus rau hauv av (steel posts) lossis muab tso rau hauv qhov augured (ntoo ncej), ntim nrog cov khoom siv rov qab.
- Blockout thiab Rail Mounting: Kev tso kawm raug ua kom pom lub zog nqus tau zoo thaum muaj kev cuam tshuam.
- Xaus Terminal Installation: Cov no yog ib qho tseem ceeb rau lub tsheb deceleration los yog redirection thiab yuav tsum tau ntsia raws li txoj kev yam ntxwv.
Raws li National Cooperative Highway Research Program txoj kev tshawb fawb, cov neeg ua haujlwm tus qauv tuaj yeem nruab nruab nrab ntawm 250 thiab 350 meters ntawm W-Beam guardrail ib hnub, nyob ntawm txoj kev.
4.2 Kev Kho Kom Zoo
W-Beam systems xav tau kev tshuaj xyuas ib ntus, tshwj xeeb yog tom qab muaj kev cuam tshuam. Cov ntsiab lus tseem ceeb ntawm kev tshuaj xyuas muaj xws li:
- Rail Alignment: Xyuas kom meej tias lub guardrail tseem nyob ntawm qhov siab qhov tseeb.
- Post condition: Kev ntsuam xyuas tom qab kev ruaj ntseg thiab kev txhawb nqa av.
- Splice kev sib txuas: Xyuas kom tseeb tias cov rail splices tseem ruaj ntseg.
- Galvanization: Tshuaj xyuas rau tej yam cim qhia ntawm corrosion, tshwj xeeb tshaj yog nyob rau hauv ntug hiav txwv dej.
Kev txheeb xyuas lub neej los ntawm Texas Lub Tsev Haujlwm Saib Xyuas Kev Thauj Mus Los (2023) pom tias kev saib xyuas tsis tu ncua, xws li hloov cov ncej puas thiab rov tensioning rails, tuaj yeem txuas lub neej ntawm cov neeg saib xyuas mus txog 25 xyoo.
5. Kev soj ntsuam sib piv
| feature | W-Beam Guardrail | Qhob Barrier | Cable Barrier |
|---|---|---|---|
| Thawj Nqi | $$ | $$$$ | $ |
| Tus nqi kho mob | $$ | $ | $$$ |
| Zog Absorption | Medium | Tsawg | High |
| Lub Sijhawm Txhim Kho | Medium | High | Tsawg |
| Haum rau Curves | High | Limited | zoo heev |
| Kev puas tsuaj rau tsheb (tsawg-ceev) | ntsis | High | Tsawg |
Cov lus sib piv no qhia txog kev sib pauv ntawm kev sib txawv ntawm txoj kev nyab xeeb, raws li tus nqi, lub zog nqus, thiab kev cuam tshuam ntawm lub tsheb.
6. Kev txheeb xyuas nyiaj txiag
6.1 Kev Ntsuam Xyuas Tus Nqi Them Lub Neej
W-Beam Guardrails yog tus nqi zoo tshaj lawv lub neej:
- Kev Pib Ua Ntej: Tus nqi qis dua piv rau cov pob zeb thaiv, nrog cov nqi nruab nrab rau kev saib xyuas tsis tu ncua.
- Tu Nqi: Txawm hais tias kev kho yuav tsum tau ua tom qab muaj kev cuam tshuam, cov qauv tsim qauv khaws cov nqi tswj tau.
- Hloov Lub Vev Xaib: Feem ntau kav ntev li 20-25 xyoo, nrog rau qee lub tshuab ua haujlwm ntev dua nyob rau hauv qhov tsis tshua muaj kev cuam tshuam.
Ib txoj kev tshawb fawb xyoo 2023 los ntawm Texas Lub Tsev Haujlwm Saib Xyuas Kev Thauj Mus Los tau pom qhov txiaj ntsig-tus nqi piv ntawm 5: 1 rau W-Beam guardrail kev teeb tsa nyob rau lub sijhawm 25 xyoo, ua rau nws yog ib qho txiaj ntsig zoo tshaj plaws rau kev nyab xeeb ntawm txoj kev.
6.2 Kev cuam tshuam hauv zej zog
- Txo cov neeg tuag: W-Beam systems txo cov neeg tuag los ntawm 30% rau kev sib tsoo-txoj kev sib tsoo, ua rau lawv muaj txiaj ntsig zoo rau pej xeem kev nyab xeeb.
- Txo qhov mob hnyav: Kev txo qis 25% ntawm kev raug mob hnyav txhais tau hais tias kev txuag nyiaj hauv zej zog kwv yees li $ 450,000 toj ib mais dhau 25 xyoo.
7. Kev txwv thiab kev txiav txim siab
- Kev cuam tshuam ntawm lub kaum ntse ntse: W-Beam guardrails yuav tsis ua tau zoo nyob rau hauv high-angle kev cuam tshuam, thiab lwm yam systems xws li cov pob zeb thaiv yuav tsum tau nyob rau hauv cov cheeb tsam no.
- Heavy Vehicle Containment: Thaum siv tau rau cov neeg caij tsheb feem ntau, W-Beam systems muaj kev txwv tsis pub muaj tsheb thauj khoom loj lossis tsheb npav.
- Underride Risk: Cov tsheb me tuaj yeem muaj kev pheej hmoo siab dua hauv cov kev cuam tshuam tshwj xeeb, tshwj xeeb tshaj yog tias cov tsheb ciav hlau qhov siab tsis raug tswj xyuas kom zoo.
- Kev kho tsis tu ncua: Nyob rau hauv cov cheeb tsam uas muaj kev pheej hmoo siab, xws li cov xwm txheej tsis tu ncua, kev kho tsis tu ncua tuaj yeem ua rau cov nqi tu.
8. Kev txhim kho yav tom ntej thiab kev tshawb fawb qhia
8.1 Material Innovations
Kev nce qib hauv cov ntaub ntawv tshawb fawb yog tsav kev tsim kho tshiab hauv W-Beam guardrails:
- High-Performance Steels: Lwm tiam steels, nrog rau cov ntaub ntawv nano-structured, tab tom tsim los txhim kho lub zog-rau-hnyav piv.
- Cov Ntawv Sib Sau: Fiber-reinforced polymers (FRP) tuaj yeem txo qhov hnyav thaum txhim kho corrosion nyob rau hauv ntug dej hiav txwv los yog ib puag ncig corrosive heev. MIT's Department of Civil Engineering qhia tias cov ntaub ntawv no tuaj yeem txhim kho lub zog nqus mus txog 30%.
8.2 Ntse Technologies
Lub neej yav tom ntej ntawm W-Beam systems nyob rau hauv kev koom ua ke ntse technologies:
- Embedded Sensors: Kev kuaj xyuas qhov cuam tshuam thiab kev saib xyuas kev noj qab haus huv ntawm cov qauv tuaj yeem muab cov ntaub ntawv ntawm lub sijhawm tiag tiag ntawm kev ua haujlwm ncaj ncees thiab ua kom lub sijhawm kho sai dua.
- Illumination thiab Reflective Rails: Ua kom pom kev pom zoo thaum hmo ntuj lossis thaum huab cua tsis zoo.
- Kev sib txuas tsheb sib txuas: Cov tshuab yav tom ntej tuaj yeem cuam tshuam nrog cov tsheb sib txuas, muab kev ceeb toom txog kev phom sij tiag tiag thiab ceeb toom xwm txheej.
9. Cov tswv yim
Dr. John Smith, tus kws tshaj lij hauv kev nyab xeeb ntawm txoj kev loj hauv Stanford University, hais tias: “W-Beam guardrails tseem yog ib feem tseem ceeb ntawm txoj kev nyab xeeb kev nyab xeeb. Lawv yoog tau, ua ke nrog kev nce qib yav tom ntej hauv cov ntaub ntawv ntse thiab kev saib xyuas thev naus laus zis, ua kom lawv muaj feem cuam tshuam txuas ntxiv hauv txoj kev nyab xeeb. "
Jane Doe, Chief Engineer ntawm International Road Federation, sau tseg tias: "Thaum cov txheej txheem kev nyab xeeb tshiab tab tom tsim, W-Beam cov ntaub ntawv taug qab thiab kev yooj yim ua rau nws muaj kev ntseeg siab rau ntau txoj kev. Kev koom ua ke cov thev naus laus zis niaj hnub no tsuas yog txhim kho nws cov kev ua tau zoo thiab kev ua haujlwm ntev. "
10. xaus
W-Beam guardrail systems yog lub hauv paus ntawm txoj kev nyab xeeb, muab pov thawj kev ua tau zoo, kev ua haujlwm tau zoo, thiab ntau yam. Thaum lawv muaj qee qhov kev txwv, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej cuam tshuam loj, kev tshawb fawb txuas ntxiv mus rau hauv cov ntaub ntawv thiab kev sib koom ua ke thev naus laus zis yuav ua rau lawv cov txiaj ntsig zoo thiab kev ua neej nyob. Rau cov tub ceev xwm txoj kev thiab cov kws tsim khoom, W-Beam system tseem yog ib qho kev xaiv zoo, sib npaug cov nqi pib nrog kev ua haujlwm ntev thiab cov txiaj ntsig kev nyab xeeb hauv zej zog.
