Qhov ntev ntawm asteel box girderhais txog qhov tseeb kab rov tav nyob nruab nrab ntawm ob qhov kev txhawb nqa uas nyob ib sab (piers, bearings, los yog cov qauv kev txhawb nqa) nyob rau hauv ib lub thawv kaw lub voj voog steel girder.Nws qhov kev ncua sij hawm cuam tshuam ncaj qha cuam tshuam rau txoj haujlwm kev nyab xeeb, nqi, thiab kev tsim kho efficiency.
Raws li tus kheej- txhawb nqa girder / truss: Kev lag luam sab saud yog 350-400 m.Rau ntshiab steel lub thawv girders, kev lag luam ncua kev txwv yog 300 m; rau steel-pab hybrid girders, nws txuas mus rau 338 m. Technically, tus kheej- txhawb nqa lub thawv steel girders tuaj yeem tsim tau rau qhov ntev tshaj 350m, tab sis tus nqi tsim kho, kev tswj cua ruaj khov thiab ntev - lub sij hawm deflection tu nqi yuav nce ntxiv.
Raws li cov hlua khov kho rau kev ncua thiab cable- nyob txuas ntxiv, lub ntiaj teb qhov ntev tshaj plaws ua tiav steel lub thawv girder ncua kev kawm ntawv choj muaj qhov ntev ntawm 2,023 m. Tsis muaj qhov ruaj khov theoretical sab sauv ncua kev txwv, thiab kev ncua sij hawm ntev tuaj yeem pom tau los ntawm kev ua kom zoo tshaj plaws cua tiv thaiv tsim thiab kev sib txuas cable.
Raws li ib qho kev paub txog steel qauv xa khoom, peb nkag siab tias girder span yog qhov tseem ceeb hauv kev tsim qauv, kev sib txuam, thiab kev tsim kho. Kev kos duab ntawm cov qauv thoob ntiaj teb thiab kev xyaum ua haujlwm txawv teb chaws, peb muab cov ncauj lus kom ntxaws ntawm steel kem seem girder span kev faib tawm, cuam tshuam cov yam ntxwv, thiab cov kev taw qhia txog kev xaiv.
Dab tsi yog Steel Box Beam?
Lub thawv steel beam yog kaw, duab plaub lossis trapezoidal hollow tus tswv cuab tsim los ntawm cov hlau phaj, ua haujlwm tseem ceeb hauv kev thauj khoom - nqa cov khoom hauv kev tsim choj.
Nws tus ntoo khaub lig- ntu muaj cov phaj saum toj kawg nkaus thiab lub phaj hauv qab txuas los ntawm cov phaj ntsug lossis lub vev xaib inclined, tsim lub thawv kaw- zoo li profile.
Lub thawv yog nyob rau hauv haum nrog longitudinal stiffeners (U-ribs los yog tiaj phaj tav) thiab transverse diaphragms los txhim kho cov buckling tsis kam ntawm nyias- cov qauv phab ntsa thiab tswj cov geometric stability nyob rau hauv load.
Tus ntoo khaub lig kaw-section distinguishes ib lub thawv steel beam los ntawm qhib-section I-girders thiab muab peb qhov zoo ntawm cov qauv:
Torsional tawv
Kaw steel lub thawv girders muaj ntau dua St. Venant torsional stiffness piv nrog qhib nyias - phab ntsa beam seem. Nyob rau hauv eccentric nyob loads, shear flow koom nrog tag nrho cov ntoo khaub lig-section, kom ntseeg tau tias muaj kev sib npaug ntawm kev ntxhov siab thiab kev cuam tshuam tsawg.
Lub zog - rau - Qhov hnyav piv
Lub thawv steel beam hnyav tsuas yog 1/3 rau 1/2 ntawm qhov sib npaug ntawm cov pob zeb ua pob zeb sib npaug. Nyob rau hauv ntev -span txuas hniav uas tuag load tswj kev tsim, qhov no hnyav txo ncaj qha txo tus nqi substructure thiab seismic teb.
Aerodynamic Performance
Lub tiaj tus, streamlined profile yuav txo tau luag thiab tsa flutter tseem ceeb cua ceev heev piv rau truss girders - tseem ceeb rau choj nyob rau hauv ntug hiav txwv dej thiab typhoon - cheeb tsam uas nquag.
Cov yam ntxwv no ua rau lub thawv steel beam indispensable nyob rau hauv ob qho tib si cov yam ntxwv sib txawv: raws li ib tug thawj load - nqa girder nyob rau hauv kab - hom txuas hniav, thiab raws li ib tug stiffening girder nyob rau hauv cable - txhawb nqa choj (xws li ob qho tib si cable - nyob thiab ncua kev kawm ntawv choj).Kev nkag siab txog lub luag haujlwm twg yog qhov tseem ceeb rau kev hais txog -cov lus nug.
Kev faib tawm ntawm lub thawv -zoo li tus nqaj hlau
Lub thawv-zoo li tus steel beam ncua kev faib tawm tsis yog nyob ntawm ib qhov ntev, tab sis yog nyob rau hauv cov txheej txheem uas lub girder ua haujlwm. Tib lub thawv steel girder tuaj yeem siv rau hauv tus choj hla 50 meters lossis tus choj hla 2,000 meters - qhov sib txawv nyob ntawm seb cov khoom nqa li cas.
Girder / truss system (tus kheej- txhawb nqa)
Hauv qhov system no, lub thawv -zoo li tus steel beam spans ntawm kev txhawb nqa,cia siab rau nws tus kheej khoov thiab shear peev xwm. Tsis muaj cables lossis yees muab kev thauj khoom ntxiv.
| Span Range | Daim ntawv thov | Steel Box Girder Configuration |
|---|---|---|
| 50–100 m | Lub nroog viaducts, nkhaus overpasses | Tsis tu ncua- qhov tob, ib qho - lub thawv cell |
| 100–250 m | Kev hla dej, kev loj choj | Variable-qhov tob, ib zaug lossis ob npaug -cell; kev sib tw nrog cov pob zeb nruj nreem |
| 250–340 m | Cov channel loj navigation | Kev sib txawv -qhov tob hybrid girder (steel midspan + pob zeb sab spans) |
| 340–400 m | Theoretical/economic limit zone | Hybrid girder nkaus xwb; yuav tsum muaj qhov chaw -kev txiav txim siab tshwj xeeb |
Cable -txhawb qhov system (stiffening girder)
Cov cables nqa cov thawj ntsug loads;lub thawv -zoo li tus steel beam muab torsional nruj, aerodynamic stability, thiab lub lawj platform.
| Span Range | Choj Hom | Steel Box Girder Role |
|---|---|---|
| 400–1,200 m | Cable -nyob twj ywm choj | Stiffening girder: resists axial compression los ntawm nyob cables + khoov raws li nyob load |
| 1,000–2,000+ m | Suspension choj | Stiffening girder: muab torsional rigidity thiab aerodynamic stability |
Cov yam ntxwv cuam tshuam rau lub thawv ntu Steel Beam Span
Tus kheej -Qhov hnyav & dabtsi yog khoov lub voj voog
Khoov lub sij hawm los ntawm tus kheej - hnyav nce nrog lub square ntawm span. Qhov loj dua girder seem rau load kuj ntxiv qhov hnyav ntxiv thiab tsim lub voj voog vicious. Tag nrho - steel girders yog uneconomical siab tshaj 300m, composite girders saum toj ntawm 338m, thiab 350-400m spans coj tus nqi txwv, tsis suav cable-bridge stiffening girders.
Deflection & Stiffness Limits
Nyob -load midspan deflection loj hlob nrog lub zog thib 4. Cov hlau ruaj khov elastic modulus rog sib sib zog nqus girders kom tau raws li L / 500 ~ L / 800 deflection qauv, ua rau cov khoom pov tseg, tsis zoo cua thiab kev thauj mus los nyuaj & hoisting.Highway steel kem girder: L / 500 ~ L / 600
Kev tsheb ciav hlau hnyav -load steel lub thawv girder: L / 700 ~ L / 800.
Local Buckling ntawm nyias -Walled Phaj
Ntev spans nce compressive kev nyuaj siab ntawm lub thawv girder flanges thiab webs, ua rau nyias nyias - phaj hauv zos buckling. Ntxiv longitudinal stiffeners thiab diaphragms daws buckling tab sis boost vuam ua hauj lwm, residual stress, raug nqi thiab tsis muaj zog sib koom tes qaug zog kuj.
Shear Lag nyhuv
Vertical loads ua rau pom tseeb shear deformation nyob rau hauv dav -flange ntev-span box girders. Kev ntxhov siab nyob ib ncig ntawm lub webs, tej thaj chaw deb flange steel yog underutilized, thiab zoo flange dav shrinks nrog ntev spans, txo tag nrho cov kabmob efficiency.
Aerodynamic Cua Stability
Sib sib zog nqus girders xav tau ntev -span txhav nthuav dav cua tiv tauj cheeb tsam thiab ua kom vortex vibration thiab flutter txaus ntshai. Cua stability dhau los ua qhov tseem ceeb tsim kev txwv rau cov ntug dej hiav txwv typhoon zones, yuav tsum tau them nyiaj cua sov- tiv thaiv kev tiv thaiv thiab siv sijhawm ntev dua.
Economic Feasibility
Tshaj li 350m sib xyaw ua ke tag nrho cov qauv teeb meem saum toj no. Steel noj, fabrication, vuam thiab erection nyuaj nce exponentially. Tus kheej- txhawb nqa lub thawv steel girders poob nqi zoo piv rau cable- txhawb nqa choj tshuab rau ultra- ntev spans.
Steel Box-zoo li tus Hlau Beam vs Lwm Hom Choj
Kev nkag siab thaum lub thawv steel girder choj yog qhov kev xaiv zoo yuav tsum tau muab piv rau nws tiv thaiv kev sib tw cov qauv ntawm cov qauv kev ua haujlwm tseem ceeb:
| Dimension | Steel Box Girder (Beam) | Qhob Box Girder | Cable-Nyob Choj | Choj Suspension |
|---|---|---|---|---|
| Kev sib tw ntau yam | 100–340 m | 0–300 m | 250–1,200 m | 1,000–3,000+ m |
| Tus kheej - hnyav (girder nkaus xwb) | Tsawg | Siab (2-3x steel) | Tsawg-mob siab | Tsawg-mob siab |
| Torsional nruj | Siab heev | Siab | High (lub thawv girder) | High (lub thawv girder) |
| Aerodynamic kev ua tau zoo | Zoo heev | Nruab nrab | Zoo | Zoo heev (twin -box muaj) |
| Kev tsim kho ceev | Fast (lub Hoobkas prefabrication) | Slow (ntawm -site casting) | Nruab nrab | Ntev (ntauwd + cable erection) |
| Kev kho mob xav tau | Siab dua (OSD qaug zog, corrosion) | qis | Siab dua (kab kab, yees) | Siab dua (cov cables loj, thauj tog rau nkoj) |
| Girder qhov tob | Hloov pauv, L / 20-L / 50 | Variable, L/18–L/40 | Qhov siab, 3-4 m | Qhov siab, 3-5 m |
Lub thawv-zoo li Steel Beam Span Daim Ntawv Thov Piv Txwv
Beam / Girder System
| Choj | Qhov chaw | Span | Xyoo | Kev teeb tsa | Ntsiab Innovation |
|---|---|---|---|---|---|
| Rio-Niterói Choj | Brazil | 300 m | 1974 | Ntshiab steel lub thawv girder, 3-span nruam beam | Orthotropic steel lawj; 13 m qhov tob ntawm kev txhawb nqa; monolithic ntu lifting |
| Stolma Choj | Norway | 301 m | 1998 | Lub teeb pob zeb (LC60) | Ua pov thawj ua tau zoo ntawm 300 m + los ntawm kev txo qis (≈1,950 kg / m³) |
| Shibanpo Yangtze River Choj | Chongqing, Suav teb | 330 m | 2006 | Steel-pab hybrid girder, nruam nruam ncej | 103 m steel midspan ntxig; PBL shear connectors ntawm kev hloov chaw |
| Taoer River Choj | Shandong, Suav teb | 338 m | 2025 | Steel-pab hybrid girder, nruam nruam ncej | Inclined hloov nto; 127 m steel midspan (1,200t) |
Cable - txhawb kev kaw lus
| Choj | Qhov chaw | Span | Xyoo | Kev teeb tsa | Ntsiab Innovation |
|---|---|---|---|---|---|
| Sutong Choj | Jiangsu, Suav teb | 1,088 m | 2008 | Cable-nyob twj ywm, steel kem girder stiffening | Thawj kab - nyob twj ywm choj tshaj 1,000 m; ntxaib- phab ntsa piers nrog D3.4 m drilled ncej |
| Stonecutters Choj | Hong Kong, Suav | 1,018 m | 2009 | Cable-nyob twj ywm, ntxaib steel lub thawv girder | Slotted ntxaib-box aerodynamic seem; stainless hlau cladding rau sab nrauv |
| Xihoumen Choj | Zhejiang, Suav teb | 1,650 m | 2009 | Ncua tseg, ib lub thawv steel girder | Streamlined ib - lub thawv nrog 3.5 m qhov tob; thawj Suav raug ncua ntev tshaj 1,600 m |
| Lingdingyang Choj | Guangdong, Suav teb | 1,666 m | 2024 | Ncua tseg, ntxaib steel lub thawv girder | Slotted ntxaib -box rau typhoon kuj; navigable channel hauv Pearl River Estuary |
| 1915 Çanakkale Choj | Qaib ntxhw | 2,023 m | 2022 | Ncua tseg, ntxaib steel lub thawv girder | Ntiaj teb cov ntaub ntawv tseem ceeb ncua; 3.6 m sib sib zog nqus ntxaib-box seem; aerodynamic optimization rau Dardanelles cua |
Vim li cas thiaj xaiv Peb Cov Kev Cai Steel Box Girder rau koj qhov project?
Raws li ntau qhov sib txawv ntawm cov thawv steel girders, peb muab cov phiaj xwm kev tsim khoom thiab tag nrho - teeb tsa kev txhawb nqa kev daws teeb meem rau cov neeg tsim choj thoob ntiaj teb thiab cov koom haum tsim: Raws li ib qho - nres steel qauv tus neeg muag khoom, peb muab customized steel box girder ntau lawm, kev txhawb nqa thiab kev xa tawm modular, adjustable raws li koj qhov project span, ib puag ncig hauv zos thiab thoob ntiaj teb cov qauv.
Anti-Nyob rau hauv Orthotropic Steel Deck Production
Peb tsim cov khoom zoo tshaj - orthotropic steel lawj. Kev nkag mus puv ob -sab vuam txo qis hauv qhov tsis xws luag ntawm U-rib pob qij txha, thiab peb muab STC composite deck steel qhov chaw kom txo qis qaug zog rau ntev - txuas txuas.
01
Txhawb nqa Anti-Corrosion Steel Structure Matching
Peb khaws qhov chaw nruab rau sab hauv dehumidification systems thaum lub sij hawm tsim khoom los tiv thaiv condensation corrosion. Q500qNH weathering steel daim hlau muaj rau cov ntug hiav txwv dej hiav txwv kom txuas ntxiv txheej txheej txheej txheem.
02
High -Precision Segmental Fabrication & Erection Steel Fittings
Txhua lub thawv steel girder ntu tau txais cov neeg hlau vuam thiab laser tshuaj xyuas kom tau raws li millimeter - theem kam rau ua. Kev cai steel erection fittings rau launching, cantilever los ua ke thiab floating crane hoisting yog muaj raws li qhov project ncua sij hawm thiab qhov chaw.
03
Custom Steel -Concrete Transition Cheebtsam
Rau 250-400m composite kem girders, peb tsim cov kev hloov pauv steel daim hlau, shear studs thiab PBL connectors kom ruaj khov quab yuam hloov ntawm cov hlau thiab pob zeb, nrog rau kev txhawb nqa cov ntaub ntawv suav nrog.
04
Kev cai Aerodynamic Steel Box Girder Segments
Rau cable-txhawb txuas txuas dua 1000m ncua, peb tsim cua-tunnel optimized steel ntu: ib lub thawv streamlined rau spans nyob rau hauv 1500m, slotted ntxaib -box rau typhoon- thaj chaw siab tshaj 1500m, triple {{70}} hla lub thawv.
05
Hu rau tam sim no kom tau txais lub thawv steel girder
| Hom Girder | Ib lub Box Girder / Multi-Box Girder |
| Span | 30m - 200m, lossis customized |
| Txoj Kev Dav | 8m - 42m, lossis customized |
| Qib khoom | Q345qC / D / E, Q370qE, Q420qE, ASTM A709 Gr.50 / Gr.50W, EN 10025 S355J2 / S355NL, JIS SM490 |
| Load Capacity | Tsim los ua raws li AASHTO HL-93 load txheem |
| Kev kho saum npoo | Phom Blasting Sa 2.5, Zinc-nplua nuj primer, epoxy intermediate coat & polyurethane topcoat |
| Kev sib txuas System | Bolt & txiv ntseej fastener sib dhos |
FAQ:
Dab tsi txheej txheej koj muab rau marine steel thawv girders nyob rau hauv siab ntsev pos huab?
Peb txais Sa2.5 blasting pretreatment, sib phim nrog zinc-nplua nuj primer, epoxy intermediate xim thiab polyurethane topcoat peb- txheej tiv thaiv-corrosion system, thiab muab weathering steel Q355qNH/Q500qNH rau cov ntug hiav txwv txuas hniav.
Koj puas tuaj yeem tsim nkhaus dav ntau-cell steel lub thawv girders raws li kev kos duab txawv teb chaws?
Yog lawm. Peb lub Hoobkas txhawb nqa tag nrho kev kos duab tob tob, kev cai ua ntawm nkhaus, nthuav dav, sib txawv cross-section multi-cell steel box girders, ua raws li AASHTO, Eurocode, BS, AS cov qauv.
Dab tsi yog lub Hoobkas tsim nyog thiab cov ntaub ntawv tshuaj xyuas koj tuaj yeem muab rau cov thawv xa khoom steel girders?
Peb tuav ISO9001 daim ntawv pov thawj zoo, CE EN1090 steel qauv ntawv pov thawj. Txhua batch ntawm cov khoom tuaj nrog cov ntaub ntawv pov thawj zeb, MT/UT NDT cov ntaub ntawv xeem thiab thib peb-cov ntaub ntawv soj ntsuam txheej txheem los ntawm SGS/BV.
Vim li cas steel lub thawv girders nyiam rau qhov ntev?
Torsional tawv:Lawv cov ntoo khaub lig kaw -section muab qhov tshwj xeeb tiv thaiv rau kev sib tw.
Aerodynamic stability:Txoj kab nqes los yog trapezoidal webs txo cua -vim kev co ntawm kev hla loj.
Kev ua tau zoo:Lawv tuav lub sijhawm khoov siab nrog cov khoom siv tsawg dua piv rau ntau hom qhib phaj girders.