Mai Tuka Tushen Tashi na Makamashi na Uku

Tsarin juyawa na pile driver tare da goyon baya na maki uku yana wakiltar wani rukuni na musamman na kayan aikin hakar mai nauyi wanda aka tsara don aikin tushe mai maki da yawa a cikin injiniyan tushe mai zurfi. Wadannan tsarin suna amfani da kananan juyawa guda uku masu zaman kansu, kowanne yana goyon bayan sandunan Kelly da hanyoyin tuki, suna ba da damar masu kwangila su gudanar da hakar da yawa a lokaci guda daga dandamali guda. Wannan tsarin kayan aiki yana da mahimmanci ga ginin bangon diaphragm, katangar katako, tsarin sandar secant, da aikace-aikacen haɗa ƙasa na haɗin gwiwa inda aikin hakar guda ɗaya na jere zai zama mai tsada ko kuma ba zai yiwu ba don lokutan aikin da ƙayyadaddun bayanai. Ka'idar aiki na pile drivers na juyawa na maki uku yana mai da hankali kan aikin mai zaman kansa na kananan juyawa guda uku da aka sanya a kan tsari mai ƙarfi. Kowanne sandar yana da tsarin hydraulic na musamman, na'urorin watsawa na torque, da kuma kulawar nauyi akan bit, wanda ke ba da damar hakar uku tare da matsi na bit, saurin juyawa, da ƙayyadaddun hakar daban-daban. Wannan 'yancin yana da mahimmanci a cikin aikace-aikacen da ke buƙatar zurfin hakar daban-daban ko yanayin ƙasa mai canzawa a cikin yankin magani. Tsarin goyon bayan maki uku yana ba da kwanciyar hankali mai kyau yayin aikin juyawa, yana rarraba ƙarfin martani daidai da rage motsi na gefe wanda zai iya lalata tsayin ko haifar da canji daga ƙayyadaddun ƙira. Watsawar wutar lantarki yawanci tana amfani da tuki na hydraulic kai tsaye ko tsarin gear na inji, tare da sabbin nau'ikan suna haɗawa da famfon canjin canji don ingancin makamashi da kulawar hakar daidai. A cikin aikace-aikace, ana amfani da tsarin juyawa na maki uku don gina bangon diaphragm ta hanyar hakar tsarin secant ko tangent da ke bayyana iyakokin bangon. Don katangar katako a cikin ginin dam, riƙon shara, da tsarin katangar ƙasa, aikin maki uku a lokaci guda yana rage lokacin aikin sosai. Ayyukan jet grouting suna samun fa'ida daga wannan tsarin lokacin da suke ƙirƙirar ginshiƙan soilcrete a cikin tsarin grid, inda ƙarfin maki uku ke ba da damar gina abubuwan katako masu jituwa cikin sauri. Ayyukan haɗa ƙasa da tabbatar da ƙasa suna amfani da hakar maki uku a lokaci guda don samun ingantaccen rufin magani a cikin ƙuntatawar jadawalin da aka takaita. Nau'in kayan aiki a cikin wannan rukuni suna bambanta a cikin ƙarfin zurfin hakar (yawanci 20 zuwa 120 mita), fitar da torque (daga 200 zuwa 500 kilonewton-meters a kowanne sandar), da kuma tsarin saurin juyawa (0.5 zuwa 150 RPM dangane da aikace-aikace). Tsarin suna bambanta a cikin nau'in mast—na'ura mai goyon baya, mai tsaye, ko mai daidaitawa—kowanne an tsara shi don yanayin geotechnical na musamman da kuma juyawar bangon. Wasu tsarin suna haɗawa da hanyoyin juyawa da tuki na kowane sandar, suna ba da damar hakar a lokaci guda; wasu suna amfani da mast ɗin da aka raba tare da tsarin abinci na musamman. Ka'idodin zaɓi don kayan aikin juyawa na maki uku sun haɗa da buƙatun diamita na hakar (yawanci 600 zuwa 1500 milimita), zurfin hakar da aka tsara da ƙwarewar ƙasa/duwatsu, buƙatar daidaiton tsayi (±0.5% zuwa ±1.0% na zurfi), geometry da samuwar yankin aikin, da kuma burin samarwa da aka auna a cikin mita na layi a kowace rana. Samun wuta, ƙarfin ƙasa don sanya kayan aiki, da kuma dacewa da tsarin juyawa na bentonite da aka tsara ko tsarin casing suna da mahimmanci a cikin zaɓin kayan aiki. Ka'idodin da suka dace da waɗannan tsarin sun haɗa da ISO 6892 don kayan aikin hakar, EN 14199 don micropiles, EN 1538 don aiwatar da bangon diaphragm, da DIN 4014 don hanyoyin gwajin nauyin sandar. Kayan aikin dole ne su bi ka'idodin ISO 4413 don tsarin wutar hydraulic da su cika ka'idodin tsaro na OSHA ko na gida don ayyukan ginin tushe mai zurfi.