Kev txhais thiab lub luag haujlwm ntawm tus qauv
Lub thawv steel kem yog kaw- ntu cov tswv cuab nrog lub xwmfab lossis lub kaum sab xis hollow profile, feem ntau yog tsim los ntawm vuam plaub steel phaj raws lawv cov npoo. Qhov kaw, ob npaug sib npaug zoo muab cov kem ze li qhov sib npaug ntawm qhov sib npaug ntawm ob qho tib si ntawm cov axes thiab lub vojvoog siab ntawm gyration rau nws qhov hnyav, ua rau nws ua haujlwm zoo rau txhua kab, choj piers thiab kev txhawb nqa hnyav.
Cov tswv cuab hloov axial compression, khoov thiab torsion los ntawm cov qauv mus rau lub hauv paus. Vim hais tias cov seem raug kaw, cov diaphragms sab hauv tuaj yeem haum rau ntawm qhov chaw thauj khoom - cov ntsiab lus qhia, thiab cov kab noj hniav tuaj yeem ua haujlwm zais cia rau cov kev pabcuam lossis tau ntim nrog pob zeb los ua ib qho qhob -cov tube steel (CFST) cov tswv cuab.
Hom Hom Steel Box Kab
Cov kab ke hauv lub thawv tau muab faib ua feem ntau los ntawm kev hla -section geometry. Peb tsev neeg yog cov duab plaub, square thiab tapered kem.
| Hom | Lub cev thiab tus cwj pwm | Hom kev siv |
|---|---|---|
| Rectangular box kem | Ob sab tsis sib xws; siab zog nyob rau hauv kev coj ntawm sab ntev | Lub tsev thav duab, choj piers thiab cog cov qauv uas yuav tsum tau nruj nreem nyob rau hauv ib qho kev taw qhia |
| Square box kab | Sib npaug sab qhov ntev; zoo tib yam txhav nyob rau hauv tag nrho cov kab rov tav cov lus qhia | Tshaj tawm kev txhawb nqa vaj tsev, cores thiab cov tswv cuab hauv qhov chaw txwv |
| Tapered kab kem | Hla- ntu txo nrog qhov siab, tom qab lub hnab ntawv khoov lub sijhawm | Canopies, masts thiab portal thav ntawv qhov twg loads txo mus rau sab saum toj |
Cov yam ntxwv zoo ntawm qhov kaw ntu
Balanced biaxial txhav
Vim hais tias lub sij hawm ntawm inertia txog ob lub ntsiab axes yog ze li ntawm qhov sib npaug, kem tsis muaj zog axis. Cov khoom thauj tuaj txog los ntawm ib qho kev taw qhia kab rov tav tsim qhov zoo sib xws khoov thiab buckling tus cwj pwm, uas ua kom yooj yim kev sib txuas tsim nyob rau hauv lub sij hawm thav ntawv thiab txhim kho cov lus teb nyob rau hauv multi-directional seismic loading.
Torsional rigidity ntawm lub raj kaw
Plaub daim hlau tsim ib lub raj kaw uas tiv thaiv torsion zoo dua li qhov qhib kuv- lossis H- ntu ntawm tib qhov hnyav. Qhov no yog qhov tseem ceeb nyob qhov twg eccentric loads, crane ua lossis seismic torsional moments ua rau tus tswv cuab.
Kev siv cov khoom siv tau zoo thiab tus kheej qis - hnyav
Cov khoom yog muab tso rau ntawm ib ncig ntawm lub seem, nyob deb ntawm lub centroid, uas maximizes lub vojvoog ntawm gyration rau ib tug npaum li cas ntawm cov hlau. Qhov tshwm sim yog ib kem sib zog rau tib lub peev xwm, txo lub hauv paus loads thiab yooj yim tuav thiab erection.
Qhov chaw rau kev pabcuam thiab kev ua vaj tse
Cov kab noj hniav sab hauv tuaj yeem siv los ua txoj hauv kev zais rau cables, piping thiab ducting, los yog ntim nrog cov qauv ua vaj tse los tsim CFST kem nrog ntau dua axial muaj peev xwm, muaj zog dua thiab txhim kho hluav taws kub, raws li muab rau hauv GB 50017, EN 1994-1-1 thiab AISC 360.
Fabrication Methods
Welded ua -up fabrication
Cov txheej txheem rau cov txheej txheem kem kab ke yog txiav plaub daim hlau, npaj cov npoo, sib sau ua ke lub thawv rau ntawm lub jig thiab vuam plaub qhov ntev seams los ntawm tsis siv neeg submerged arc vuam (SAW). Internal diaphragms thiab stiffeners raug ntsia rau ntawm thaj chaw vaj huam sib luag, splices thiab thauj khoom- cov ntsiab lus qhia, feem ntau siv electroslag vuam (ESW) qhov chaw nkag tau txwv. Kev ua raws li AWS D1.1 lossis EN 1090-2 nrog cov kws tsim khoom tsim nyog thiab cov txheej txheem pom zoo.
Cold forming thiab kub sib sau
Txias txoj kev los ntawm kev nias braking yog txwv rau me me, nyias- cov ntu phab ntsa siv rau cov tswv cuab ntawm cov vaj tse sib sib zog nqus. Kub sib sau, nyob rau hauv uas daim hlau yog rhuab ua ntej khoov, suits loj los yog tuab seem uas txias forming yog tsis tau. Feem ntau cov khoom thauj -cov kabmob kem rau cov tsev thiab cov txuas hniav yog welded ua- cov tswvcuab ntau dua li cov qauv tsim.
Kev tswj xyuas zoo thaum tsim khoom
Kev tswj xyuas zoo suav nrog cov ntawv pov thawj ntawm cov phaj tuab thiab cov ntaub ntawv pov thawj, qhov ntsuas qhov ntsuas ntawm tus ntoo khaub lig- ntu thiab qhov ncaj, thiab tsis yog- kev ntsuas kev puas tsuaj ntawm welds, feem ntau yog 100% ultrasonic kuaj (UT) ntawm qhov tseem ceeb tag nrho - nkag welds nrog sib nqus particle kuaj (MT) qhov xav tau. Kev npaj deg ua raws ISO 8501-1, feem ntau yog Sa 2.5, ua ntej txheej txheej ISO 12944 lossis kub-dip galvanizing ib ISO 1461.
Xaiv thiab Specification Checklist
Txhais kev tswj hwm kev sib xyaw ua ke thiab kem qhov siab hauv qab GB 50017, AISC 360 lossis EN 1993-1-1
Xaiv seem loj thiab phaj thickness kom txaus siab, ruaj khov thiab deflection txwv
Xaiv cov qib steel kom phim txoj cai tswj hwm: ASTM A572 Qib 50 lossis 60, EN 10025-2 S355JR / J0 / J2, lossis GB / T 1591 Q355B / C / D / E
Qhia meej diaphragm thiab stiffener layout ntawm vaj huam sib luag zones, splices thiab load-cov ntsiab lus taw qhia
Qhia cov txheej txheem vuam (AWS D1.1 lossis EN 1090-2) thiab NDT cov cai, piv txwv li 100% UT ntawm qhov tseem ceeb welds
Txhais kev npaj nto rau ISO 8501-1 Sa 2.5 thiab txheej txheej ISO 12944, lossis kub-dip galvanizing raws ISO 1461
Paub meej tias hom splice, txoj kev erection, thiab seb cov kab noj hniav puas yuav puv nrog pob zeb
Cov lus nug nquag
Dab tsi yog qhov txawv ntawm ib lub thawv kem thiab ib kab khoom?kem kem yog hollow, nrog cov ntaub ntawv concentrated ntawm lub perimeter. Rau tib qhov hnyav nws muab zoo dua dabtsi yog khoov thiab torsional tsis kam thiab lub vojvoog siab ntawm gyration dua li cov khoom seem, thaum siv cov khoom siv tsawg.
Puas yog lub thawv ntawv tsim nyog rau thaj tsam seismic?Yog lawm. Balanced biaxial stiffness thiab uniform stress tis ua ke kem zoo haum rau seismic -cov txheej txheem resistant, tsim raws li cov kev cai ntawm cov cai xws li GB 50017, AISC 341 thiab EN 1998-1.
Cov kab kem puas tuaj yeem kho tau?Yog lawm. Tshooj loj, phaj thickness, qib steel, diaphragm qhov sib nrug thiab kev kho saum npoo tuaj yeem hloov kho raws li qhov yuav tsum tau ua, uas yog ib qho laj thawj welded ua - cov kab ke hauv lub thawv yog muaj nyob rau hauv cov qauv tsim.
Puas yog lub thawv kab ntawv corrosion resistant?Hlau nws tus kheej tsis yog corrosion- pov thawj, tab sis lub thawv ntawv muab lub neej ntev kev pab cuam thaum tsim los ntawm cov qib tsim nyog thiab tiv thaiv nrog cov txheej txheem tsim nyog raws li ISO 12944 lossis kub -dip galvanizing ib ISO 1461.
Lub thawv kem puas tuaj yeem sau nrog pob zeb?Yog lawm. Qhob-cov raj xa dej puv (CFST) cov kab sib txuas ua ke nrog lub plhaub steel nrog lub pob zeb ua kom muaj peev xwm ntau dua axial, nruj dua thiab txhim kho kev ua haujlwm hluav taws, thiab tau tsim raws li GB 50017, EN 1994-1-1 lossis AISC 360 Tshooj I.
Thaum twg yog lub thawv tapered kem dua?Tapered seem ua raws li lub hnab ntawv khoov lub sijhawm thiab txuag cov khoom uas cov khoom thauj txo nrog qhov siab, xws li masts, canopies thiab portal thav ntawv. Lawv ntxiv fabrication complexity, yog li qhov kev txuag yuav tsum raug soj ntsuam tiv thaiv tus nqi ntxiv.