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 | Lub tsev pheeb suab yog lub chamber uas muab cov neeg ua haujlwm kho kom nkag mus rau cov dej ntws, cov kav dej thiab lwm yam khoom siv hauv av. Hatch npog zais qhov nkag mus rau lub chamber. |
| Feem ntau manhole npog yog tsim los ntawm cov hlau uas muaj zog heev. Vim nws lub zog, cov hlau nplaum tso cai rau cov tsheb txav mus rau ntawm lub manhole npog yam tsis muaj kev tawg lossis khoov lawv, thiab tib neeg tuaj yeem taug kev hla lawv yam xyuam xim. Manhole npog tuaj yeem ua los ntawm cov hlau stamped thiab yas. |
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Access npog thiab nkag daim phiaj |
| Kev soj ntsuam npog thiab cov phaj nkag yog lwm lub npe rau manhole npog. Lawv tuaj yeem muaj ntau qhov sib txawv thiab yog ib feem ntawm ntau yam hauv av xws li dej, kav dej, hluav taws xob thiab TV. |
Tswj phaj |
| Lub phaj saib lossis saib lub hau coj mus rau hauv chav saib, feem ntau tsis tshaj 450 mm (17.5 ntiv tes) dav thiab tsis pub tshaj 600 mm (24 ntiv tes) tob. Lawv yog puag ncig los yog duab plaub thiab qhib nrog lub hatch key. |
Nkag mus rau lub koob yees duab |
| Cov chav nkag tau loj txaus rau ib tus neeg los tho qhov dej los yog ua lwm yam kev tu. |
kaus |
| Hatches yog cov chav loj tshaj plaws. Ib tug neeg tuaj yeem nkag mus rau hauv av hauv av los ntawm kev nkag. Manholes tuaj yeem yog qhov tob, tab sis qhov qhib qhov loj yog feem ntau 600 x 900 mm (62 x 35 hauv). Lawv cov npog feem ntau yog ua los ntawm cov hlau cam khwb cia hnyav thiab muaj cov keyways thiab cov khoom plig qhov chaw (qhov khoob qhov twg lub crowbar tuaj yeem muab tso rau loosen lub hau ua ntej nqa). |
Manhole npog |
| Qee qhov manhole npog yog ua los ntawm polypropylene, uas yog ib lub teeb yuag thiab ruaj khov; lawv feem ntau pom nyob rau hauv txoj kev tsheb los yog cov neeg taug kev. Lawv qhib thiab kaw nrog screws los yog lub teeb yuag yas yuam sij nrog rau lub hatch cover. Qee tus neeg xaiv hom manhole npog no vim tias tus nqi pib tsawg heev. Yog li ntawd, lawv tsis muaj nqi seem, yog li lawv tsis tshua muaj neeg nyiag. |
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