Izikhiphi Zokalini

Izinsiza zokujikeleza ezingu-casing ziyi-hydraulic noma izindlela zokusebenza ezihlinzeka ngejubane lokujikeleza kumashina e-casing ngesikhathi sokubhola emisebenzini ye-fondation ejulile. Ngaphakathi kwesigaba sokwakhiwa kwe-secant pile wall, lezi zinsiza zingxenye ezibalulekile zohlelo lokubhola ezivumela ukujikeleza okufanayo nokukhuphuka okungaguquki kwamathube e-casing okwesikhashana noma okwakhiwa kuqondile, okuyisidingo esiyisisekelo sokugcina ukuzinza kwe-borehole nokufeza ukwakheka kwepile okunembile ezimeni ze-geotechnical ezinzima. Isebenzisa enkulu ye-casing rotators ikhiye ekwenzeni ama-secant pile walls, lapho izipili zama-concrete eziqinile zifakwa ukuze kudaleke izindonga zokwakha eziqhubekayo ukuze kusekelwe ukumbiwa kwe-basement, ukuziqedwa komhlaba, kanye nezithiyo ezijulile. Zisizwa futhi ekwakhiweni kwemishi ye-diaphragm, ikakhulukazi lapho kusebenzelwa izindlela zokubhola ezisekelwe kumacasing esikhundleni samasistimu ejikelele. Izicelo ezengeziwe zifaka imisebenzi ye-jet grouting efakiwe kumasistimu e-casing, ukukhiqizwa kwamakholomu okuxuba umhlabathi-nokhonkolo, kanye nasezinhlelweni ezithile ze-sheet pile wall lapho izindlela zokubhola ezijikayo zithuthukisa ukusebenza kwe-driving nokulawula ubude ezindaweni ezingazinzile. Umqondo wezokusebenza we-casing rotator ubandakanya ukuguqula amandla e-hydraulic noma wesimanje kube ukuthambekela kokujikeleza okuqhubekayo okusebenzisa ku-casing string ngezinjini ezikhona phezulu. I-rotator, evamise ukufakwa ku-kelly noma kumast ye-drilling rig, ihlangene kahle ne-casing nge-drive head ebamba iphayiphile. Njengoba i-casing ijikeleza, ukuhlekisana phakathi kwe-casing yangaphandle nomhlabathi, kuhlanganiswe nemisebenzi yokushefa ye-casing shoe (umkhono onamathiselwe noma oqinile eusha esi-borehole), kuphula futhi kukhiphe impahla yomhlabathi, kuvumela ukuhamba phansi ngaphansi kwe-pressure yokfeed ye-rig. Lokhu kujikeleza nokuphakamisa okufanayo kuvinjezelwa ukwenzeka kwemibhoshongo, kugcina ubude, futhi kunciphisa ingozi yokuphambuka kwe-casing ezimweni ze-geotechnical ezingazinzile. Izinsiza zokujikeleza ezingu-casing zikhona ngokuqukethwe okwenziwe ngezinhlelo zokwakhiwa nezidingo ze-diameter ye-casing. Izimizwa ze-hydraulic, uhlobo olujwayelekile, zifaka ama-gearboxes eziplanethi noma izinto zokushayela eziqondile ezihlinzeka ngokuqhubeka okuvela ku-10 kuye ku-150+ kilonewton-meters (kN·m), okuhambelana nezinsiza ze-casing eziphakathi kuka-300 mm no-1500 mm. Izinhlelo ezilawulwayo noma ze-semi-automatic zisebenza kumasistimu anediyothi encane. I-Drive head interfaces izamile izindandatho eziyinqaba ze-API nezinhlobo ezihambisanayo ze-quick-coupling. Ukukhetha izinsiza ezihambelana ne-casing rotator kudinga ukuhlolwa kwezinye izici eziningi. Usayizi we-casing kanye ne-torque yokubhola elindelekile, ekhombisa ngokwehlukaniswa komhlabathi, ubude, kanye nomklamo we-casing shoe, zihambisana nezibalulekile. Ukutholakala kwamandla e-rig—kokubili i-hydraulic flow rate (liters ngeminithi) kanye namandla okpressure—kufanele kuhambisane nezincazelo ze-rotator. Izidingo zokusebenza ezifaka ukuphakama kwenhloko okuthokozisayo, ijubane lokujikeleza (ngokuvamile 5 kuya ku-30 RPM), kanye nokuhambisana nezinhlelo zokuhola ezikhona ze-rig kuthinta kakhulu ukukhetha kwezinsiza. Ukuqina ezingxenyeni ezinzima noma zomhlabathi eziqhubekayo, ukumelana nokwearing kwemithwalo, kanye nokuvikeleka kwamasondo kubalulekile ukuze kuqhubeke ukusebenza kahle kokubhola. Izindinganiso ezifanele zokusebenza kwe-casing rotator zifaka i-ISO 20475 (izidingo zokuphepha kwezinsiza zokubhola), izindinganiso ezihlobene ze-DIN zamishini ye-hydraulic, kanye nezincazelo ezithile ze-project ezinikezwe ab производители be-system ye-casing kanye nezinhlelo ze-rig. Ukuhambisana kuqinisekisa ukuphepha komsebenzi nokusebenza okuvamile kokubhola ezimeni ze-geotechnical ezahlukene.