Txhawm rau kom ntseeg tau tias cov tub ntxhais kho qhov muag muaj kev tiv thaiv los ntawm cov neeg kho tshuab, thermal, tshuaj lom neeg, thiab kev puas tsuaj ntawm cov dej noo, nws yuav tsum tau nruab nrog cov ntaub los yog cov txheej txheem ntxiv. Cov kev ntsuas no ua tau zoo txuas ntxiv lub neej kev pab cuam ntawm optical fibers.
Feem ntau siv sheaths hauv optical cables muaj xws li A-sheaths (aluminium-polyethylene bonded sheaths), S-sheaths (steel-polyethylene bonded sheaths), thiab polyethylene sheaths. Rau cov kav dej sib sib zog nqus dej, cov khoom siv hlau nplaum yog feem ntau ua haujlwm.
Polyethylene sheaths yog tsim los ntawm linear low-density, medium-density, los yoghigh-density dub polyethylene khoom, ua raws li tus qauv GB / T15065. Qhov saum npoo ntawm dub polyethylene sheath yuav tsum du thiab sib xws, tsis muaj npuas pom, pinholes, los yog tawg. Thaum siv los ua ib txheej txheej, lub nominal thickness yuav tsum yog 2.0 hli, nrog ib tug yam tsawg kawg nkaus thickness ntawm 1.6 hli, thiab qhov nruab nrab thickness ntawm ib tug ntoo khaub lig-section yuav tsum tsis txhob tsawg tshaj li 1.8 hli. Cov khoom siv kho tshuab thiab lub cev ntawm lub plhaub yuav tsum ua tau raws li qhov yuav tsum tau teev tseg hauv YD / T907-1997, Table 4.
Lub A-sheath muaj cov txheej txheem dej noo uas ua los ntawm qhov ntev qhwv thiab sib tshoojyas coated aluminium daim kab xev, ua ke nrog ib qho extruded dub polyethylene sheath. Polyethylene sheath bonds nrog cov ntaub nplaum sib xyaw thiab cov npoo sib tshooj ntawm daim kab xev, uas tuaj yeem txuas ntxiv nrog cov nplaum yog tias xav tau. Qhov dav sib tshooj ntawm daim kab xev sib xyaw yuav tsum tsis pub tsawg dua 6 hli, lossis rau cov kab hluav taws xob uas muaj txoj kab uas hla tsawg dua 9.5 hli, nws yuav tsum tsis pub tsawg dua 20% ntawm cov tub ntxhais qhov ncig. Lub nominal thickness ntawm polyethylene sheath yog 1.8 hli, nrog ib tug tsawg kawg nkaus thickness ntawm 1.5 hli, thiab ib tug nruab nrab thickness tsis tsawg tshaj li 1.6 hli. Rau Hom 53 txheej txheej, nominal thickness yog 1.0 hli, qhov tsawg kawg nkaus thickness yog 0.8 hli, thiab qhov nruab nrab thickness yog 0.9 hli. Aluminium-yas composite daim kab xev yuav tsum ua tau raws li tus qauv YD / T723.2, nrog rau daim kab xev txhuas uas muaj nominal thickness ntawm 0.20 hli los yog 0.15 hli (yam tsawg kawg nkaus 0.14 hli) thiab cov yeeb yaj kiab thickness ntawm 0.05 hli.
Ob peb daim kab xev sib txuas raug tso cai thaum tsim khoom siv cable, muab qhov sib koom ua ke tsis pub tsawg tshaj 350 m. Cov pob qij txha no yuav tsum xyuas kom muaj hluav taws xob txuas ntxiv thiab rov ua cov txheej txheem yas sib xyaw. Lub zog ntawm qhov sib koom ua ke yuav tsum tsis pub tsawg dua 80% ntawm thawj daim kab xev lub zog.
S-sheath siv cov txheej txheem ntub dej uas ua los ntawm qhov ntev qhwv thiab sib tshooj corrugatedyas coated steel daim kab xev, ua ke nrog ib qho extruded dub polyethylene sheath. Cov polyethylene sheath bonds nrog cov ntaub nplaum sib xyaw thiab cov npoo sib tshooj ntawm daim kab xev, uas tuaj yeem ntxiv nrog cov nplaum yog tias tsim nyog. Lub corrugated composite daim kab xev yuav tsum tsim ib lub nplhaib zoo li cov qauv tom qab qhwv. Qhov dav sib tshooj yuav tsum tsis pub tsawg tshaj 6 hli, los yog rau cov tub ntxhais cables uas muaj txoj kab uas hla tsawg dua 9.5 hli, nws yuav tsum tsis pub tsawg tshaj 20% ntawm cov tub ntxhais qhov ncig. Lub nominal thickness ntawm polyethylene sheath yog 1.8 hli, nrog ib tug tsawg kawg nkaus thickness ntawm 1.5 hli, thiab ib tug nruab nrab thickness tsis tsawg tshaj li 1.6 hli. Cov hlau-yas sib xyaw daim kab xev yuav tsum ua tau raws li YD / T723.3 tus qauv, nrog rau cov hlau daim kab xev muaj ib tug nominal thickness ntawm 0.15 hli (yam tsawg kawg nkaus 0.13 hli) thiab ib tug composite zaj duab xis thickness ntawm 0.05 hli.
Cov kab xev sib txuas raug tso cai thaum tsim cov kab hluav taws xob, nrog qhov sib txuas yam tsawg kawg nkaus ntawm 350 m. Cov kab xev hlau yuav tsum yog pob tw-jointed, ua kom muaj hluav taws xob txuas ntxiv thiab rov ua kom cov txheej txheem sib xyaw. Lub zog ntawm qhov sib koom ua ke yuav tsum tsis pub tsawg dua 80% ntawm qhov sib xyaw ua ke ntawm daim kab xev lub zog.
Aluminium daim kab xev, steel daim kab xev, thiab hlau hlau armor khaubncaws sab nraud povtseg siv rau ya raws barrier yuav tsum muaj hluav taws xob continuation ntawm lub cable ntev. Rau cov ntaub ntawv sib txuas (xws li Hom 53 txheej txheej), tev lub zog ntawm aluminium lossis steel daim kab xev thiab polyethylene sheath, nrog rau lub zog tev tawm ntawm cov npoo sib tshooj ntawm aluminium lossis steel daim kab xev, yuav tsum tsis pub tsawg dua 1.4 N / mm. Txawm li cas los xij, thaum cov khoom thaiv dej los yog txheej yog siv rau hauv qab aluminium lossis steel daim kab xev, lub zog tev tawm ntawm cov npoo sib tshooj tsis tas yuav tsum tau ua.
Cov qauv kev tiv thaiv zoo no ua kom cov kav ntev thiab kev ntseeg siab ntawm cov kab hluav taws xob kho qhov muag hauv ntau qhov chaw, ua tau raws li qhov xav tau ntawm kev sib txuas lus niaj hnub no.
Post lub sij hawm: Jan-20-2025