Oscillators na casing

Casing oscillators na'urori ne na musamman da ake amfani da su a cikin ginin bango mai zurfi da ginin bango na secant don sauƙaƙe shigarwa da cirewa na wucin gadi na ƙarfe. Babban aikin su shine yin amfani da motsi mai sauri na oscillatory (maimaitawa) a tsaye ko a kwance ga axis na casing, yana rage friction tsakanin casing da ƙasa da ke kewaye, bentonite slurry, ko tarin siminti a lokacin muhimman matakai na ginin bango. A matsayin muhimman sassa na tsarin ginin tushe na zamani, casing oscillators suna inganta ingancin aiki, rage lokutan zagaye, da kuma rage lalacewar tsarin ga panel na bango da aka kammala. A cikin ginin bango mai zurfi, ana amfani da casing oscillators musamman a lokacin fitar da casing bayan an sanya siminti. A lokacin shigar da bango na secant pile, suna taimakawa a cikin duka shigar da casing na farko da cirewa na ƙarshe, suna hana haɗin kai da haɗarin da za a iya faruwa lokacin da casings suka kulle ta hanyar friction ko tasirin shan iska. Hakanan ana amfani da kayan aikin a cikin aikin katanga da jet grouting inda strings na casing na wucin gadi ke buƙatar motsi mai kyau da aka tsara ba tare da juyawa ko canje-canje marasa kulawa da za su iya lalata ingancin slurry ko sabon tarin grout da aka haɗa. Ka'idar aiki tana dogara ne akan motsi mai sauri na maimaitawa—yawanci yana haifar da oscillations 10 zuwa 60 a kowace minti, tare da girman motsi daga milimita 50 zuwa 150—yana ƙirƙirar juyayi na juriya da matsawa a kan fuskar casing-ƙasa. Wannan oscillation yana karya haɗin haɗin kai tsakanin saman waje na casing da kayan da ke kewaye, a lokaci guda yana rage juriya na friction da inganta motsi na sama ko ƙasa. Daidaitaccen oscillation tare da saurin cirewa ko shigarwa da aka tsara yana tabbatar da motsin casing mai laushi, yana rage gurɓataccen a cikin pour na siminti, da kuma kare panel na bango da aka riga aka shigar daga motsin gefe ko fashewar tsarin. Casing oscillators na zamani na'urori ne na hydraulic, wanda aka sanya kai tsaye akan jagoran ko Kelly bar na babban rig na hakowa/ginin bango. Sun ƙunshi silinda na hydraulic tare da taron piston na musamman wanda ke haifar da motsin oscillatory, wanda aka ba da ƙarfin ta hanyar tsarin hydraulic na rig wanda ke aiki a ƙarƙashin matsin lamba wanda yawanci ke tsakanin 200 da 280 bar. Wasu tsarukan sun haɗa da vibratory oscillators waɗanda ke haɗa juyawa da motsin oscillatory na layi don inganta ingancin cirewa a cikin yanayi masu wahala tare da haɗin kai mai yawa ko layukan ƙasa. Ka'idodin zaɓin casing oscillators suna mai da hankali kan diamita da kauri na casings da za a sarrafa, buƙatar yawan oscillation da girman, ƙarfin hydraulic da ake da shi daga babban rig, yanayin ƙasa (haɗin kai da granules, kasancewar ruwa mai ƙarfi), da zurfin shigarwa. Kayan aikin dole ne su dace da ƙarfin ɗaukar nauyin rig da ƙayyadaddun tsarin hydraulic; ƙananan oscillators suna zama marasa tasiri, yayin da manyan na'urori na iya haifar da ƙarfin gefe mai yawa wanda ke lalata panel da ke kusa. Abubuwan yanayi da suka haɗa da yanayin ruwa, ƙasa mai ƙarfi, da buƙatun aikin musamman suna shafar zaɓin. Ayyukan casing oscillator yana bin ƙa'idodin ISO, DIN, da EN da suka shafi kayan aikin ginin tushe mai zurfi, musamman EN 1538 (Aikin aikin geotechnical na musamman—Bango mai zurfi), ISO 6934 (Kayan ƙarfe na waya don lif), da DIN 4124 (Hanyoyin hakowa da aikin ƙasa—Ka'idodin tsaro). Takaddun shaidar kayan aiki, takardun nazarin tsarin, da hanyoyin aiki dole ne su bi ƙa'idodin ginin yanki da ƙayyadaddun ƙira na geotechnical da aka kafa a lokacin matakan injiniya na daki-daki.