Manhole Pwm yog tus tshiab, ib puag ncig cov khoom siv uas ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm nyob hauv tsev thiab kev tsim kho. Piv rau cov tsoos brick manholes, Manhole pwm muaj ntau yam zoo, ua rau lawv lwm txoj kev xaiv. Niaj hnub no, peb yuav tsom rau kev tsim kho ntawm Manhole pwm kom muab cov kev pab rau kev pab dawb.
Manhole Pwm tsim yuav tsum yog qhov ua rau cov lus qhia tshwj xeeb. Cov txheej txheem tuaj yeem faib ua cov kauj ruam: qhov thiab lub hauv paus teeb kev teeb tsa, kev teeb tsa Manhole, cov khoom siv Manhole, thiab cov dej muaj ntsuas. Txhua kauj ruam yuav tsum tau nqa tawm raws li cov kev cai los xyuas kom meej kev teeb tsa kom zoo thiab ua kom yooj yim. Tsis tas li ntawd, tsis zoo li Brick Manholes, kev saib xyuas ntawm Manhole Pwm yog ncaj, xav tau cov neeg ua haujlwm nqis los rau hauv qhov dej; Yooj yim, kev ua cov cuab yeej ntxuav tau muaj txaus.
Kev tsim kho ntawm kev soj ntsuam kom zoo pwm yog yooj yim thiab sai. Kev kuaj xyuas cov pwm tshiab tau txais kev sib dhos cov qauv sib dhos. Tus ncej zoo kuj tseem tuaj yeem txiav thiab kho rau ntawm qhov chaw. Nws tuaj yeem hloov kho kom haum ntau yam kev tsim kho, ua kom muaj kev txhim kho tus nqi kev tsim kho, thiab ua kom muaj zog txhim kho kev tsim kho, thiab ua kom muaj ntau dua 10-20 lub sij hawm uas yog kev soj ntsuam ib txwm zoo. Nws kuj tseem tuaj yeem tsim. Crick kev tshuaj xyuas kom zoo thiab lwm yam kev soj ntsuam kom zoo pwm kom zoo tsis tuaj yeem piv nrog nws.