Ua PE Cov kav dej faus tseem xav tau kev kho tiv thaiv corrosion

Ib qho ntawm qhov zoo ntawm PE kav dej yog lawv cov tshuaj tiv thaiv rau cov kua qaub thiab alkali corrosion, yog li tsis tas yuav tiv thaiv corrosion. Txawm li cas los xij, qhov tsis zoo ntawm cov kav dej PE yog tias lawv tsis muaj zog thiab oxidation tsis kam, thiab creep tshwm sim thaum kub nce, thiab lawv muaj feem cuam tshuam thaum kub poob. Cov kav dej polyethylene muaj lub zog qis dua li cov kav hlau hlau thiab muaj kev cuam tshuam rau qhov kub thiab txias. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum tau xyuam xim rau qhov faus qhov tob, nyob deb ntawm cov kav dej kub, thiab zam lwm cov kav dej. Lub hwj chim qaum yog nyob rau hauv tib lub trench. Nyob rau hauv cov xwm txheej tshwj xeeb, koj yuav tsum tuav ib qho kev ncua deb thiab ntsuas tshwj xeeb raws li tus qauv, nce, nqis, sab laug, thiab sab xis. Thaum nteg nyob rau hauv ib tug serpentine zoo, lub linear expansion coefficient ntawm polyethylene kav yog ntau tshaj li 10 npaug ntawm cov hlau. Yog li ntawd, nws tuaj yeem tso tau raws li qhov hloov pauv ntawm cov kav dej PE, uas tuaj yeem tsim cov av thiab nkhaus, tab sis lub vojvoog dabtsi yog khoov yuav tsum ua raws li qhov yuav tsum tau ua.
50mm Tsawg dua los yog sib npaug ntawm cov yeeb nkab txoj kab uas hla D Tsawg dua los yog sib npaug rau 160mm, qhov tso cai khoov vojvoog R yuav tsum yog cov yeeb nkab txoj kab uas hla 50D. Yog tias muaj cov pob qij txha hauv cov kav dej, nws yuav tsum yog tsawg kawg yog 125D. Cov kev xav tau rov qab los
Tom qab tso cov yeeb nkab polyethylene, nws yuav tsum tau them tam sim nrog cov av zoo lossis xuab zeb, nrog lub thickness ntau dua 30cm, kom tsis txhob muaj kev puas tsuaj rau cov yeeb nkab polyethylene los ntawm sab nraud quab yuam.
2. Trench backfilling yuav tsum xub ntim rau hauv qab ntawm lub raj xa dej, tom qab ntawd rov qab cov raj xa dej los ntawm ob sab, thiab tom qab ntawd sau rau saum cov kav dej li 50 centimeters (yog tias muaj dej hauv qhov kwj dej). Tom qab ntawd ntxiv.
3. Nyob rau hauv kev nyab xeeb kev tsim kho, raws li backfilling tiav, kev txhawb nqa ntawm lub trench yuav tsum tau muab tshem tawm, thiab tom qab tshem tawm cov kab ntsug, qhov sib txawv yuav tsum tau ntim nrog xuab zeb.
4. Tsis pub dhau 50 centimeters ntawm sab saum toj ntawm cov kav dej rov qab ntawm ob sab, sab saum toj ntawm cov kav dej yuav tsum tsis txhob muaj cov pob zeb crushed, xws li cov pob zeb crushed, cib, khib nyiab, thiab lwm yam. Cov av khov yuav tsum tsis txhob siv los sau cov khoom siv rov qab. Cov av tuaj yeem muaj cov pob zeb me me thiab cov av khov nrog lub cheeb ntawm 10 centimeters los yog tsawg dua, thiab yuav tsum tsis pub tshaj 15 feem pua ​​​​ntawm tag nrho cov khoom thauj.
Backfilling yuav tsum tau compressed nyob rau hauv cov khaubncaws sab nraud povtseg, nrog ib tug tuab ntawm 20-30 centimeters ib txheej. Backfilling yuav tsum tau manually compressed ntawm ob sab ntawm lub raj xa dej thiab nyob rau hauv 50 centimeters ntawm sab saum toj ntawm lub raj xa dej. Yog hais tias qhov rov qab yog 50 centimeters saum toj ntawm lub raj xa dej, cov neeg kho tshuab compression tuaj yeem ua tau. Nws yuav tsum yog 25-40 centimeters.
Lub miniaturization ntawm txhua feem ntawm qhov zawj yuav tsum ua raws li cov hauv qab no:
A. Sau (I) 95 feem pua ​​; B. Cov yeeb nkab sab saum toj 50 cm (II) 85 feem pua; C. (III) 50 cm saum toj av, 95 feem pua ​​​​hauv nroog, thiab 90 feem pua ​​​​ntawm cov av cultivated. Txhawm rau tiv thaiv cov kav dej PE los ntawm kev puas tsuaj thaum lub sijhawm ua haujlwm ntawm qhov ncauj, ib daim kab xev ceeb toom raug tso tawm rau ntawm qhov chaw ntsug ntawm cov kav dej 50 centimeters deb ntawm sab saum toj ntawm cov kav dej. Cov kab xev ceeb toom yog siv los ceeb toom cov neeg thib peb kom muag cov ntawv ceeb toom thaum ua rau lawv. Hauv qab no yog cov yeeb nkab polyethylene, ua tib zoo qhib cov kab noj hniav kom tsis txhob ua rau PE gas pipeline puas.