Txhawm rau kom ntseeg tau tias kev siv cov khoom siv hlau npog npog, yuav tsum tau them nyiaj rau kev teeb tsa zoo, ua kom qhov tseeb qhov ntev, ruaj ntseg installation, qhib tau yooj yim, thiab lub ntsej muag huv si thiab zoo nkauj. Thaum tsim cov brickwork rau ductile hlau manhole npog, sab hauv txoj kab uas hla ntawm lub manhole qhib yuav tsum phim lub puab kab ntawm lub manhole npog thiab grate. Lub manhole npog yuav tsum tau yaug nrog txoj kev nto. Tom qab nchuav thiab tso pob zeb lossis asphalt rau lub hauv paus manhole, lub hau yuav tsum qhib thiab ntxuav tam sim kom tsis txhob mortar lossis asphalt los ntawm kev sib xyaw ntawm lub manhole npog thiab hauv paus ua ke, uas tuaj yeem cuam tshuam rau yav tom ntej qhib.
Thaum txhim kho manhole hauv paus ntawm cov cement txoj kev, nrum ib tug 20cm tuab C25 pob zeb nplhaib beam ntawm brickwork ntawm lub manhole qhib thiab du nws. Xyuas kom lub manhole puag yog ruaj khov rau tag nrho plaub sab, theem, thiab tsis xoob. Npog lub nplhaib 40cm dav tiv thaiv ib ncig ntawm lub manhole npog (los yog ib lub nplhaib tiv thaiv 20cm dav rau cov cement txoj kev, ntxiv dag zog nrog steel tuav). Cia tsawg kawg 10 hnub rau kev kho.
Thaum tsim cov asphalt pavements, nyias daim hlau yuav tsum tau siv los npog manhole npog, los yog khib nyiab cav roj yuav tsum tau txhuam rau saum npoo los tiv thaiv asphalt los ntawm txau mus rau lub manhole npog. Thaum txhim kho cov hlua hlau manhole npog ntawm asphalt pavements, yuav tsum tau saib xyuas kom tsis txhob siv cov tshuab siv ncaj qha khiav ntawm lub hauv paus manhole. Thaum cov pavement raug nrum tag nrho, qhov me ntsis loj dua li lub hauv paus manhole yuav tsum tau tshwj tseg rau hauv txoj kev rau kev teeb tsa tom qab tso asphalt.
