Yuav ua li cas manholes yog?

Manholes ua tau teem ntau tshaj qhov manhole. Qhov no chaw muab kev nkag mus rau underground hlauv taws xob: dej, cua daj cua dub dej, cable los yog raj dej. Nws lub ntsiab functions: kev tiv thaiv thiab kua dej los ntawm kev puas tsuaj thiab kom muaj kev ruaj ntseg ntawm cov neeg taug kev thiab cov neeg tsav tsheb.

Manhole npog pab raws li ib tug teeb meem thaiv cov nag thiab tiv thaiv tsis tau tso cai nkag mus rau hauv qhov dej. Feem ntau, manholes hnyav ntau tshaj li 50 kg, yuav nyuaj rau koj tsiv tawm. Feem ntau, lub kaus mom muaj ib tug yeej zoo lawm, tab sis koj yuav nrhiav tau ib tug square, lub thiab kheej li qe.

Round hau yuav tsum vov manholes, yooj yim nyob rau hauv hais tias nws tsis tig, thiab yog li ntawd tsis txhob poob rau hauv qhov dej. Ntxiv mus, thaum lub sij hawm nws siv nws yuav siv sij hawm tsawg cov ntaub ntawv thiab yooj yim ntau lawm tshuab. Nyob rau hauv cover muaj ib lub qhov. Nws tswj cov roj sib tov rau hauv lub zoo (txiav txim pub txwv). Nrog nws yooj yim mus qhib manholes, siv ib tug nuv nrog ib tug tooj liab taub.

Nyob rau saum npoo ntawm lub hau yog feem ntau yog ua mas nuj nqis, tiv thaiv kom txhob lub tsub zuj zuj thiab khov ntawm cov dej. Duab lawv txawv los ntawm lub cim, hais txog dab tsi kev sib txuas lus muaj, rau tag nrho cov hom ntawm cov dluab. Optionally phau ntawv cover on uas ib tug qauv, los yog qhia txog yam tshiab yuav tau xwm tsev neeg lub tsho tiv no. Peb coj raws li kev ceev faj concave hatches tsis ua.

Siv ob peb cov ntaub ntawv rau npog. Hatches npua-hlau yog cov feem ntau thiab feem ntau siv rau ib tug muaj scale. Tab sis koj yuav nrhiav tau yas, yas, roj hmab thiab pob zeb ua manholes. Tab sis hlau yog lub ntsiab khoom rau lawv cov khoom. Cam khwb cia hlau hatches yus cia siab rau, durability thiab kuj mus rau lwm cheeb tsam. Tsis ntev los no, lawv tau los ua ib tug nrov hom phiaj ntawm tub sab tub nyiag (pab coj seem hlau). Tus nqi ntawm ib tug xws cover yuav tsum yog los ntawm 50 mus rau 200 dollars, thiab tawm yus hatches qhib, ces nws yog ntsia lwm txoj.

Nws tau los ua ib tug hnov li sib zuj zus thov rau yas kaus mom. Lawv yog cov yuav kav ntev, eco-tus phooj ywg thiab muaj tsis muaj nqi. Siv ntawm steel nyob rau hauv lub qhov chaw ntawm ntsuab tej qhov chaw, nyob rau footpaths thiab Pavements. Lawv lub ntsiab disadvantage yog cov uas tsis muaj zog, yog li ntawd lawv tsis teem nyob rau hauv txoj kev.

Tsis hau rau cov lim dej manhole yuav ua tau kom zoo txim. Nthuav cov hluas tawg khiav ri niab thiab passers-by yuav tsis pom lub qhib daug thiab lub caij nplooj zeeg. Muaj ib tug tau hais tias ib tug neeg yuav poob rau hauv lub qhov taub, ua ntej nws yuav lob tuav ntawm ib tug them nyiaj yug, raws li ib tug tshwm sim ntawm kev raug mob (puas, contusion). Yog li ntawd, yog tias ib tug neeg raws li cov qhib daug, sim kom tiv thaiv xws txim. Nyob rau hauv nws qhib tau tsij ib tug loj ceg, yam tsawg kawg. Nws yuav pom thiab bypass. Tag nrho manholes tsis npog yuav tsum tau xov laj kab ncig thiab kaw sai li sai tau.