Kev ceev faj rau kev tsim kho cov pob zeb ua vaj tse culvert:
1. Foundation qhov excavation yog nqa tawm los ntawm txhais tau tias ntawm phau ntawv txuam machinery. Ua ntej excavation, ntsuas kom raug cov kab them nyiaj, kos cov excavation profile, txiav txim siab txoj hauj lwm ntawm lub tshuab excavation thiab txoj hauj lwm ntawm kev tso tseg. Thaum excavation, siv txoj kab nqes los khawb thiab, yog tias tsim nyog, tiv thaiv phab ntsa ntawm lub qhov. Thaum lub hauv paus pit yog nyob rau hauv lub kwj deg ntawm cov thawj irrigation dej ntws, txoj kev ib ntus yuav tsum tau excavated los tiv thaiv cov irrigation dej ntws.
2. Tom qab lub hauv paus trench excavated, lub cushion yuav tsum tau muab tso rau. Lub compaction yuav tsum siab tshaj 90% thiab txiav txim siab los ntawm qhov hnyav-duty compaction test.
3. Lub hauv paus kev tsim kho ntawm lub pedestal tuaj yeem muab pov rau hauv qhov chaw thiab simmered ntawm qhov chaw uas siv lub tshuab 砼 tov khoom. Qhov loj ntawm lub pedestal yuav tsum ua tau raws li cov qauv tsim. Lub hauv paus yeeb nkab tuaj yeem nchuav rau hauv ob qhov chaw. Qhov qis ntawm cov yeeb nkab hauv qab yog nchuav ua ntej, thiab lub thickness ntawm cov yeeb nkab puag yog tshwj tseg thiab cov yeeb nkab seem ntawm cov yeeb nkab sib txuas yog 2 ~ 3cm. Tom qab cov yeeb nkab sib txuas yog muab tso rau, lub sab sauv ntawm cov yeeb nkab hauv qab yog nchuav.
4. Kev teeb tsa cov yeeb nkab txuas Cov yeeb nkab txuas ntawm cov yeeb nkab culverts yog npaj yuav yuav ntawm cov kws tshaj lij prefabrication cov nroj tsuag thiab thauj los ntawm lub tsheb mus rau qhov chaw tsim kho.
Cov yeeb nkab txuas txuas yog ntsia los ntawm cov dej ntws qis, kom qhov sib koom ua ke tig mus rau sab saud, thiab txhua lub culvert yuav tsum tau nruj nreem txuas rau lub pedestal kom lub culvert sib sib zog nqus, thiab tag nrho cov yeeb nkab txuas yuav tsum tau muab tso rau raws li qhov tseeb axis thiab txoj kab nqes.
5. Qhov sib koom ua ke dav ntawm lub culvert yuav tsum tsis pub tshaj 10mm. Nws yog nruj me ntsis txwv tsis pub nce kev sib koom ua ke kom tau raws li qhov yuav tsum tau ua ntawm qhov ntev culvert. Cov asphalt lossis lwm yam khoom siv elastic impervious yog siv los sau rau sab hauv thiab sab nraud ntawm qhov sib koom ua ke los tsim cov txheej txheem sealing yooj yim.