I-casings ye-polyvinyl chloride engashintshiwe (PVC-U) imele uhlobo olunembile lwemithi yokwakha ye-thermoplastic eyenzelwe izinhlelo zokusebenza ezingezansi emhlabathini embonini yokwakha izisekelo ezijulile, uphenyo lwe-geotechnical, kanye nezinhlelo zokuthuthukiswa komhlaba. Iqukethe i-PVC resin eqinile ngaphandle kokufaka izingcindezi, i-PVC-U casings iveza ukuzinza okuhle kwemilinganiselo, ukumelana nezinto ezimbi, kanye nokumelana nesikhathi uma kuqhathaniswa nezinye ezithambile. Izici ezisemqoka zokwakhiwa kwalesi s materiał — okuhlanganisa isisindo esiphansi, ukuvikelwa kokugqwala, nokulula kokufakwa — zenza kube ukukhetha okuhamba phambili kokwakhiwa kwemibhoshongo, ukuhamba kwe-casing, nezinhlelo zokuthuthukiswa komhlaba lapho ukuqina kwesikhathi eside kwempahla kubalulekile. Emsebenzini wezobunjiniyela bezisekelo ezijulile kanye ne-geotechnical, i-PVC-U casings isebenza ngezifundo ezinkulu ezithile. Ikakhulu, zisetshenziswa njengama-casings emibhoshongweni ngesikhathi sokuhlola izisekelo, ukuhlolela ukwakhiwa kwama-pile, kanye ne-operation yokuhlonza umhlabathi eyenziwa ngemishini yokudonsa, imishini yokuhlola, kanye ne-CPT (Cone Penetration Testing) systems. Lezi zicasing zenza kube lula ukufinyelela kumafomu angaphansi emhlabathini, zivumela ukufakwa kokuhlola amanzi omhlaba, futhi zisekela imikhankaso yokuthola umhlabathi. Ezinhlelweni zokuthuthukiswa komhlaba, i-PVC-U tubing isebenza njengomjikelezo wezinhlelo zokugrouta, amakholomu ezitini, kanye nezinhlelo zokuhlanganisa umhlaba no-cement. Ngaphezu kwalokho, i-PVC-U casings ibalulekile ekubekweni kwe-nail emhlabathini, ukufakwa kwe-micropile, kanye nezinhlelo zokuhlola ukunyakaza ekwakhiweni kwezindonga ezijulile nangaphandle. I-PVC-U casings ilethwa ngendlela yomjikelezo — ngokuvamile ubude bezinye eziyi-1–4 amamitha enezinhlelo zokuxhuma ezivamile (i-socket-and-spigot, i-threaded, noma izixhumi zomshini) — kuthuthukisaUkuhlangana nokuhlukaniswa ngokushesha endaweni yokwakha. Uma sefinyelelwe, ama-casings agcinwa ngokuhlanganyela ezindaweni ezivikelekile ukuvikela ukuguguleka kwe-UV kanye nomonakalo. Ukufakwa emhlabeni kuyahilela ukunyukela kokuma okujwayelekile noma okukhungathekile usebenzisa i-rotary drilling, i-percussion, noma izinhlelo zokunyakaza, kuye ngobunjalo bomhlabathi kanye nenqubo ye-casing. Isimo esincane se-PVC-U (cishe sikhulu ngama-60% kungaphezu kokulinganiswa kwama-casings ensimbi) sinciphisa izidingo zemishini futhi sisheshisa ukufakwa, ikakhulukazi ezindaweni ezikude noma ezivimbile. Izinga elijwayelekile nezilinganiso zihluka kusukela ku-63 mm kuya ku-500+ mm ububanzi bangaphandle, namathayi enziwe ngokwe-EN 1401 (izinhlobo ze-DN32 kuya ku-DN630) kanye nezincazelo ze-ASTM F480. Izinhlobo ezivamile zifaka phakathi ama-casings aqinile emiphakathini ejwayelekile, ama-casings abhoshwe ukuze kwenziwe ukuhlola amanzi omhlaba, kanye nezici ezikhethekile zokugrouta ne-micropile. Izinketho zokukhetha ama-casings zihlanganisa ukugqwala komhlabathi, imichilo yezamanzi omhlaba, ubukhulu bokudonsa obukhulu, kanye nendawo yokushisa. Abadwebi bahlole izidingo zokuma kombhoshongo, ingcindezi ye-hydrostatic elindelekile, kanye nokuhambisana kwezimboni nemathayi (ukwakhiwa, ibentonite, ama-polymers) ukuze kuqinisekiswe izinga elilungile lemibhoshongo kanye nezincazelo zemathayi. Izinga lomhlaba elibeka imithetho ewusizo yokusebenza kwe-PVC-U casings ngamafanelekile ku-EN 1401 (amathangi e-PVC wokuhlinzeka ngethuli), EN ISO 4435 (i-thermoplastic casing yokwakhiwa kwemibhoshongo), ASTM F480 (ithangi le-PVC lokwakhiwa kwegquma), kanye ne-ISO 7481 (amathangi e-thermoplastic). Ukuhambisana nale mithetho kuqinisekisa ukuziphatha okungabikezelwa kwempahla, ukuvumelana nemigomo, kanye nokuhambisana nemishini ejwayelekile yokudonsa. Ukuhlola kokumelana kwale msebenzi kumazinga amanzi omhlaba ama-asidi, ama-alkali, nokwakha, kuhambisana nemicabango ye-geotechnical grouting systems nezithasiselo, kuhambisana namadala isikhathi eside ezimweni ezinzima ezingezansi—okuyisidingo esiyisisekelo ekwakhiweni kwezisekelo ezijulile lapho ukuhamba kabusha kanye nezindleko zokulungiswa zikhubazekile.
I-casings ye-polyvinyl chloride engashintshiwe (PVC-U) imele uhlobo olunembile lwemithi yokwakha ye-thermoplastic eyenzelwe izinhlelo zokusebenza ezingezansi emhlabathini embonini yokwakha izisekelo ezijulile, uphenyo lwe-geotechnical, kanye nezinhlelo zokuthuthukiswa komhlaba. Iqukethe i-PVC resin eqinile ngaphandle kokufaka izingcindezi, i-PVC-U casings iveza ukuzinza okuhle kwemilinganiselo, ukumelana nezinto ezimbi, kanye nokumelana nesikhathi uma kuqhathaniswa nezinye ezithambile. Izici ezisemqoka zokwakhiwa kwalesi s materiał — okuhlanganisa isisindo esiphansi, ukuvikelwa kokugqwala, nokulula kokufakwa — zenza kube ukukhetha okuhamba phambili kokwakhiwa kwemibhoshongo, ukuhamba kwe-casing, nezinhlelo zokuthuthukiswa komhlaba lapho ukuqina kwesikhathi eside kwempahla kubalulekile. Emsebenzini wezobunjiniyela bezisekelo ezijulile kanye ne-geotechnical, i-PVC-U casings isebenza ngezifundo ezinkulu ezithile. Ikakhulu, zisetshenziswa njengama-casings emibhoshongweni ngesikhathi sokuhlola izisekelo, ukuhlolela ukwakhiwa kwama-pile, kanye ne-operation yokuhlonza umhlabathi eyenziwa ngemishini yokudonsa, imishini yokuhlola, kanye ne-CPT (Cone Penetration Testing) systems. Lezi zicasing zenza kube lula ukufinyelela kumafomu angaphansi emhlabathini, zivumela ukufakwa kokuhlola amanzi omhlaba, futhi zisekela imikhankaso yokuthola umhlabathi. Ezinhlelweni zokuthuthukiswa komhlaba, i-PVC-U tubing isebenza njengomjikelezo wezinhlelo zokugrouta, amakholomu ezitini, kanye nezinhlelo zokuhlanganisa umhlaba no-cement. Ngaphezu kwalokho, i-PVC-U casings ibalulekile ekubekweni kwe-nail emhlabathini, ukufakwa kwe-micropile, kanye nezinhlelo zokuhlola ukunyakaza ekwakhiweni kwezindonga ezijulile nangaphandle. I-PVC-U casings ilethwa ngendlela yomjikelezo — ngokuvamile ubude bezinye eziyi-1–4 amamitha enezinhlelo zokuxhuma ezivamile (i-socket-and-spigot, i-threaded, noma izixhumi zomshini) — kuthuthukisaUkuhlangana nokuhlukaniswa ngokushesha endaweni yokwakha. Uma sefinyelelwe, ama-casings agcinwa ngokuhlanganyela ezindaweni ezivikelekile ukuvikela ukuguguleka kwe-UV kanye nomonakalo. Ukufakwa emhlabeni kuyahilela ukunyukela kokuma okujwayelekile noma okukhungathekile usebenzisa i-rotary drilling, i-percussion, noma izinhlelo zokunyakaza, kuye ngobunjalo bomhlabathi kanye nenqubo ye-casing. Isimo esincane se-PVC-U (cishe sikhulu ngama-60% kungaphezu kokulinganiswa kwama-casings ensimbi) sinciphisa izidingo zemishini futhi sisheshisa ukufakwa, ikakhulukazi ezindaweni ezikude noma ezivimbile. Izinga elijwayelekile nezilinganiso zihluka kusukela ku-63 mm kuya ku-500+ mm ububanzi bangaphandle, namathayi enziwe ngokwe-EN 1401 (izinhlobo ze-DN32 kuya ku-DN630) kanye nezincazelo ze-ASTM F480. Izinhlobo ezivamile zifaka phakathi ama-casings aqinile emiphakathini ejwayelekile, ama-casings abhoshwe ukuze kwenziwe ukuhlola amanzi omhlaba, kanye nezici ezikhethekile zokugrouta ne-micropile. Izinketho zokukhetha ama-casings zihlanganisa ukugqwala komhlabathi, imichilo yezamanzi omhlaba, ubukhulu bokudonsa obukhulu, kanye nendawo yokushisa. Abadwebi bahlole izidingo zokuma kombhoshongo, ingcindezi ye-hydrostatic elindelekile, kanye nokuhambisana kwezimboni nemathayi (ukwakhiwa, ibentonite, ama-polymers) ukuze kuqinisekiswe izinga elilungile lemibhoshongo kanye nezincazelo zemathayi. Izinga lomhlaba elibeka imithetho ewusizo yokusebenza kwe-PVC-U casings ngamafanelekile ku-EN 1401 (amathangi e-PVC wokuhlinzeka ngethuli), EN ISO 4435 (i-thermoplastic casing yokwakhiwa kwemibhoshongo), ASTM F480 (ithangi le-PVC lokwakhiwa kwegquma), kanye ne-ISO 7481 (amathangi e-thermoplastic). Ukuhambisana nale mithetho kuqinisekisa ukuziphatha okungabikezelwa kwempahla, ukuvumelana nemigomo, kanye nokuhambisana nemishini ejwayelekile yokudonsa. Ukuhlola kokumelana kwale msebenzi kumazinga amanzi omhlaba ama-asidi, ama-alkali, nokwakha, kuhambisana nemicabango ye-geotechnical grouting systems nezithasiselo, kuhambisana namadala isikhathi eside ezimweni ezinzima ezingezansi—okuyisidingo esiyisisekelo ekwakhiweni kwezisekelo ezijulile lapho ukuhamba kabusha kanye nezindleko zokulungiswa zikhubazekile.
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