Kev teeb tsa ntawm polyurethane-insulated piping yog "qhov project zais" (kev ua haujlwm zais), qhov kev saib xyuas kom meej txiav txim siab txog kev pabcuam lub neej ntawm cov raj xa dej. Ua ntej kev tsim kho, txheeb xyuas cov duab kos rau ntawm qhov chaw thiab nruj me ntsis tshuaj xyuas tag nrho cov ntaub ntawv: polyurethane ua npuas ncauj yuav tsum muaj qhov ntom ntom ntawm Ntau dua lossis sib npaug li 60 kg / m³ thiab kaw-cell piv ntawm Ntau dua lossis sib npaug li 90%; sab nraud tiv thaiv casing yuav tsum ua raws li cov qauv kev tiv thaiv; thiab phab ntsa thickness sib txawv ntawm cov yeeb nkab steel yuav tsum tsis pub tshaj 10%. Thaum excavating trenches, xyuas kom meej tswj kev nce siab thiab txoj kab nqes, thiab siv cov dej ntws los tiv thaiv cov dej. Thaum lub sij hawm thauj thiab nqa, siv cov hlua mos los tuav cov kav dej nrog kev saib xyuas, thiab kaw cov yeeb nkab kawg kom tiv thaiv kev nkag ntawm cov khib nyiab. Thaum lub sij hawm installation, tshuaj xyuas weld bevels, ua qhov kev ntsuam xyuas tsis muaj kev puas tsuaj (NDT) thiab kev ntsuam xyuas xau, thiab xyuas kom meej tias cov welds nyob deb ntawm cov yeeb nkab. Field-foaming ntawm cov pob qij txha yuav tsum phim cov thickness thiab tiv thaiv txheej specifications ntawm tus thawj kav dej, nrog rau ib tug tshwj xeeb tsom rau waterproofing. Txhim kho cov kev txhawb nqa ruaj khov thiab nthuav dav ntxiv raws li tus qauv tsim; xyuas kom meej tias cov cua tso tawm li qub tau muab tso rau ntawm cov ntsiab lus siab thiab cov dej ntws tawm ntawm cov ntsiab lus qis. Waterproofing yog ib qho tseem ceeb heev - cov pob qij txha thiab kev txhawb nqa piers yuav tsum tau muab kaw kom nruj. Backfilling yuav tsum tau ua nrog xuab zeb, uas yuav tsum tau compacted; Kev siv cov khib nyiab-laden av rau backfilling yog nruj me ntsis txwv tsis pub. Rau qhov ntsuas hydrostatic siab, tuav lub siab sib npaug li 1.5 npaug ntawm qhov tsim siab rau ib teev; Lub siab poob siab yuav tsum tsis pub tshaj 0.05 MPa, thiab yuav tsum tsis muaj cov cim qhia ntawm to. Tom qab qhov kev ntsuam xyuas siab, yaug cov kav dej hauv cov txheej txheem teev tseg. Tsis txhob ua haujlwm rwb thaiv tsev thaum los nag lossis daus, thiab ua kom muaj kev tiv thaiv zoo ntawm cov khoom nruab nrog thiab ua raws li cov txheej txheem kev nyab xeeb thoob plaws hauv cov txheej txheem. Txhua theem ntawm kev tsim kho yuav tsum tau saib xyuas ntawm qhov chaw thiab cov ntaub ntawv zoo kom lav lub sijhawm ntev, kev nyab xeeb, thiab txhim khu kev qha ntawm cov kav dej cua sov.