Grouting na juyin ruwa mai biyu fasaha ne na maganin ƙasa da ke haɗa lalata da aka tsara tare da jujjuyawar grout a lokaci guda don inganta halayen ƙasa da ƙirƙirar rufin injiniya a cikin ƙasa da dutse. A cikin mahallin injiniya tushe masu zurfi, wannan fasahar tana aiki a matsayin mafita mai mahimmanci don gyara da kuma hana wuraren rauni, rage permeability, da ƙirƙirar shinge na injiniya a cikin yanayi mai wahala. Tsarin ruwa mai biyu yana da kyau musamman ga ayyukan tushe masu zurfi inda grouting na ruwa guda ɗaya na gargajiya ya gaza saboda zurfin gaske, dutsen da aka raba sosai, ko ƙwayoyin da ke da ƙarancin permeability wanda ke buƙatar matsa lamba mai dorewa da cikakken haɗakarwa. Fasahar tana aiki bisa ga ka'idar jujjuyawar matakai biyu: ruwa mai matsa lamba ko iska mai matsa lamba (ruwan farko) ana fitar da shi ta hanyar mai lura don lalata da kuma sa ƙasa ta zama ruwa, yayin da a lokaci guda ana jujjuya wani tsari na grout wanda aka gina da siminti ko na musamman a cikin wannan yankin. Juyin ruwa yana ƙirƙirar rami kuma yana haɗa grout da kyau cikin ƙasa mai kewaye, yayin da sashi na biyu na grout ke cike gurabe da kuma haɗa ginshikin ƙasa da aka magance. Wannan jujjuyawar a lokaci guda yana da tasiri fiye da ayyukan jere a cikin ƙasa mai rabuwa ko granules, yayin da yake tilasta grout cikin hanyoyin da aka faɗaɗa yayin da yake kiyaye haɗakarwa da yanayin matsin lamba. Tsarin yana ƙirƙirar tarin ƙasa-cement mai ƙarfi tare da rabo mai raguwa sosai da ƙarin ƙarfin ɗaukar nauyi. Ayyukan farko a cikin aikin tushe mai zurfi sun haɗa da ginin labulen katsewa a ƙarƙashin dam, rufin wuraren da ke da ruwa a kusa da hakar, ƙirƙirar shinge a cikin gyaran ƙasa mai guba, daidaita dutsen a kusa da ginshiƙan secant da tangents, da kuma magance gurabe a ƙarƙashin gine-ginen da suka wanzu. Tsarin ruwa mai biyu yana da kyau a cikin aikace-aikacen da ke buƙatar rage permeability ƙasa da 10⁻⁶ cm/s, ginin tushe a cikin ƙasa da silt, da daidaita dutsen limestone da chalk da aka raba. Hanyar tana da matuƙar amfani don magance rami, rami, da wuraren da ke fuskantar saukar ƙasa kafin shigar da tushe mai zurfi. Tsarin kayan aiki a cikin wannan rukuni yawanci yana haɗa da na'urorin lura na musamman tare da tsarin nozzle biyu, famfo masu matsa lamba masu ƙarfi (ƙarfin grout 50–200 liters/minute), tsarin matsa lamba na iska ko na'urorin matsa lamba na ruwa, tsarin ɗaukar ginshiƙai na atomatik don sarrafa zurfin magani, kayan aikin lura da matsin lamba da saurin gudu, da cikakkun tarin bututun umbilical da aka ƙayyade don aikin matakai biyu. Tsarin zamani yana haɗa da rajistar bayanai a cikin lokaci na ainihi na ƙayyadaddun jujjuyawa da sarrafa zurfi don tabbatar da ingantaccen magani a cikin ginshikin grout. Zaɓin kayan aikin grouting na ruwa mai biyu yana dogara ne akan wasu abubuwan fasaha: zurfin magani (tsayin ginshiƙi), nau'in ƙasa da dutse da permeability, buƙatun ƙarshe na permeability na yankin da aka magance, samun damar shiga don sanya rig, radius na grouting da ake buƙata a cikin kowanne rami, da ƙayyadaddun kwangila don takardun shaida da tabbatar da inganci. Zaɓin kayan aikin yana kuma la'akari da buƙatun viscosity na grout da ƙarfin matsawa, yanayin zafin jiki da ke shafar hydration, da ka'idodin doka ko na musamman na aikin don matsin jujjuyawa, saurin gudu, da sararin wuraren magani. Fasahar tana ƙarƙashin EN 12716 (Aikin ginin aikin geotechnical na musamman - Jet grouting), wanda ke bayar da rarrabuwa na tsarin grouting na jet, ka'idodin tabbatar da inganci, da ƙa'idodin karɓa. Ƙarin ka'idodin da suka dace sun haɗa da ISO 21503 (Gwajin in-situ na tushe masu zurfi) don tabbatar da halayen yankin da aka magance, DIN 4093 (ka'idodin Jamus na grouting), da buƙatun musamman na aikin bisa ga ƙa'idodin ginin tushe da na geotechnical.
Na'urorin shigar ruwa biyu suna wakiltar kayan aiki na musamman da aka tsara don aiwatar da shigar ruwa biyu na jeti, wata hanya ta inganta ƙasa wacce ke amfani da hanyoyin ruwa guda biyu daban-daban don ƙirƙirar tsare-tsaren ƙasa masu ƙarfi da katanga na permeability. Wadannan na'urorin suna da matuƙar muhimmanci wajen gina bangon diaphragm, katanga masu hana ruwa, bangon ginshiƙai na secant, da sauran abubuwan tushe masu zurfi da ke buƙatar daidaitaccen daidaitawa da sealing na ƙasa. Fasahar tana zama mai mahimmanci ga kwangiloli masu tushe masu zurfi da ke aiki a cikin ƙasa mai ruwa, gurbatacce, ko kuma marasa ƙarfi inda hanyoyin gargajiya ke zama marasa isasshen ko kuma ba su da tasiri. Tsarin shigar ruwa biyu na jeti yana aiki bisa ka'idar shigar da ruwan ginin farko da ruwa na biyu na gurbatawa/transport, yawanci ruwa ko haɗin ruwa da iska, ta hanyar nozzles da aka tsara musamman da aka sanya a cikin ramin hakowa. Ruwa na biyu mai sauri yana gurbata tsarin ƙasa na kusa yayin da ginin ke cika ramin da aka ƙirƙira kuma yana samun saiti a cikin ƙasa da aka sassauta. Wannan hanyar ruwan biyu tana ba da damar kwangiloli su cimma girman ginshiƙai mafi girma, ingantaccen daidaito, da ingantaccen kulawa da inganci idan aka kwatanta da tsarin ruwa guda ɗaya. Ana fitar da jets daga sama zuwa ƙasa, ko dai a cikin aikace-aikacen tsaye don ƙirƙirar bangon tsaye ko a cikin tsarin juyawa don ƙirƙirar ginshiƙai silinda da ke aiki a matsayin katanga masu jujjuyawa ko abubuwan ɗaukar nauyi. Aikace-aikacen suna rufe yanayi da yawa na tushe masu zurfi. A cikin katanga masu hana ruwa na ƙasa, na'urorin shigar ruwa biyu suna ƙirƙirar ginshiƙai na jeti masu ci gaba ko masu jujjuyawa waɗanda ke rage yawan ruwa da ke shiga ta hanyar aquifers da yankunan gurbatacce. Don ginin bangon diaphragm, ginshiƙan jeti na farko suna inganta ƙarfin ƙasa da rage shigar ruwa na ƙasa yayin hakar panel na bangon diaphragm na gaba. A cikin bangon ginshiƙai na secant, abubuwan da aka gina da jeti suna aiki a matsayin ginshiƙai na farko suna bayar da goyon bayan tsari da sarrafa permeability. Wadannan na'urorin suna kuma magance daidaitawar ƙasa a ƙarƙashin gine-ginen da ke akwai, suna rage haɗarin zama da raguwa a cikin wuraren birni. Tsarin na'urorin yana bambanta bisa ga buƙatun aiki. Na'urorin shigar ruwa biyu na yau da kullum suna ƙunshe da na'urorin famfo masu matsin lamba mai yawa (yawanci 20–40 MPa don layukan ginin da 10–20 MPa don layukan ruwa), tsarin rarraba ruwa biyu tare da auna masu zaman kansu, kanun hakowa masu jujjuyawa tare da nozzles na jeti da aka haɗa, da kuma na'urorin ɗaga/daidaita. Wasu tsarin suna haɗa da damar ruwa uku, suna shigar da iska mai matsa a matsayin ruwan uku don inganta gurbatawa da inganta diamita na ginshiƙi. Ci gaban ya haɗa da tsarin sarrafa zurfin atomatik, sa ido kan matsin lamba da gudu a cikin lokaci, da tabbatar da jujjuyawar ginshiƙai tare da taimakon kwamfuta don tabbatar da ci gaba da gina katanga. Ka'idodin zaɓi suna mai da hankali kan wasu ƙayyadaddun fasaha. Matsakaicin matsin aiki yana ƙayyade girman ginshiƙi da zurfin shigarwa; matsin lamba mafi girma yana ba da damar ginshiƙai mafi girma amma yana buƙatar ƙirar tsari mai ƙarfi. Gudun ginin yana buƙatar daidaita saurin shigarwa da ƙarfin na'ura da yanayin ƙasa. Saurin juyawa da daidaiton wurin suna shafar tsarin ginshiƙi, musamman ma a cikin aikace-aikacen bangon jujjuyawa. Rarraba tsarin ƙasa—ciki har da nau'in ƙasa, ƙarfin matsa lamba mara iyaka, da yanayin ruwa na ƙasa—yana shafar zaɓin nozzle, haɗin ruwa, da ƙa'idodin aiki. Iyakokin muhalli, kamar iyakokin girgiza da ƙa'idodin sauti a cikin wuraren birni, suna ba da fifiko ga tsarin ruwa biyu masu shiru fiye da hanyoyin da ke amfani da iska. Ka'idodin masana'antu da ke kula da shigar ruwa biyu na jeti sun haɗa da DIN EN 12716 (Aikin Ayyukan Geotechnical na Musamman), wanda ke ƙayyade ƙira, aiwatarwa, da buƙatun tabbatar da inganci, da ISO 15702-1 wanda ke magance ma'anar jeti da rarrabuwa. Karin jagoranci yana fitowa daga ƙa'idodin ƙasa (Faransanci NF P94-155, ƙa'idodin Jamus DGGT) da shawarwari na fasaha na musamman daga ICOLD da ƙungiyoyin ƙwararru. Ka'idodin kwangila yawanci suna buƙatar ginshiƙai na gwaji, gwajin ƙarfi, da hoton shaidar wurin ginshiƙi don tabbatar da ci gaba da katanga da ingancin tsari.
Masu matsa iska don ayyukan jet grouting na ruwa biyu suna wakiltar kayan aikin masana'antu na musamman da aka tsara don bayar da iska mai matsa lamba a matsayin babban hanyar jet a cikin aikace-aikacen tushe mai zurfi da inganta ƙasa. A cikin tsarin ruwa biyu, jet na iska yana aiki tare da jet na grout, suna haɗuwa a zurfi don ƙirƙirar ginshiƙi na ƙasa-siminti mai haɗaka. Masu matsa iska suna zama tushen wannan tsarin isar da pneumatic kuma suna da matuƙar muhimmanci don samun ƙarfin haɗawa da geometry na ginshiƙi da ake buƙata don aikin gini. A matsayin muhimmin sashi a cikin fasahar Ground Walls da Cutoff Curtains, waɗannan masu matsa iska suna ba da damar aiwatar da katangar katako na jet-grouted, katangar diaphragm, da ginshiƙai na ƙasa-siminti da aka haɗa da aka yi amfani da su a cikin ƙirar tushe mai zurfi, kulawa da ruwa, da kuma daidaita hanyoyin. Ka'idar aiki na tsarin ruwa biyu yana dogara da jets guda biyu masu bambanta: jet na iska mai sauri (yawanci ana bayar da shi daga mai matsa iska a ƙarƙashin matsa lamba na 15–40 bar) da jet na grout mai sauri ƙasa (ana bayar da shi daga famfon siminti). Jet na iska yana aiki a matsayin babban hanyar juyawa, yana karya tsarin ƙasa da kuma jigilar kayan da aka hakar zuwa saman. Jet na grout mai jinkirin motsi yana biye da hanyar jet na iska kuma yana ajiye kayan haɗin gwiwa a cikin ramin da aka ƙirƙira, yana haifar da ginshiƙi mai ɗorewa. Masu matsa iska suna buƙatar ci gaba da aiki ko kuma a hankali a cikin dogon lokutan grouting, yawanci a ƙarƙashin matsa lamba mai yawa don daidaita nauyin hydrostatic a zurfi da kuma tabbatar da isasshen motsi ta cikin ƙasa mai kauri ko haɗaka. Tsarin jet grouting na ruwa biyu yana amfani da masu matsa iska na ƙwanƙwasa na dindindin ko masu matsa iska na piston a matsayin manyan nau'in kayan aiki. Masu matsa iska na ƙwanƙwasa suna mamaye a cikin manyan ayyuka saboda ingantaccen isar da ruwa a ƙarƙashin matsa lamba mai kyau da ƙananan buƙatun kulawa; ana zaɓar masu matsa iska na piston don ƙananan ayyuka ko inda samuwar wutar lantarki take da iyaka. Zaɓin mai matsa iska yana dogara da wasu sharuɗɗan fasaha: matsa lamba da ake buƙata (yawanci 25–40 bar na gaske don jet grouting a zurfin mita 30), yawan gudu (daga 4 zuwa 12 m³/min a kowane ginshiƙi, dangane da diamita na ginshiƙi da zurfin magani), tsarin aiki (ci gaba ko kuma a hankali a cikin juyawa), da kuma samuwar ƙarfin tushen (motar lantarki, injin dizal, ko haɗin gwiwa). Karin la'akari sun haɗa da bushewar iska da cire danshi, saboda tururin ruwa a cikin iska mai matsa lamba na iya lalata kimiyyar grout da kuma kawo cikas ga ingancin ginshiƙi. Ka'idodin ƙasa na duniya da suka shafi ƙira da aikin masu matsa iska sun haɗa da ISO 1217 (rarraba aikin iska mai matsa lamba), EN 60204-1 (tsaro na injuna—kayan aikin lantarki), da ISO 4413 (karfin ruwa na hydraulic—ka'idojin gaba ɗaya da tsaro). Tsarin ruwa biyu da kansa yana ambaton a cikin DIN 4093 (inganta ƙasa ta hanyar haɗin zurfi) da sabbin ƙa'idodin ISO don kayan ƙarancin ƙarfin ƙarfi (CLSM) da abubuwan da aka juyar da jet. Zaɓin kayan aiki daga masu kwangila yana buƙatar la'akari da ƙa'idodin muhalli na gida da suka shafi fitar da hayaki daga masu matsa iska, matakan hayaniya (yawanci ana iyakance su zuwa 85–95 dBA), da kuma kulawa da ƙura a cikin yankunan da aka cika.
Na'urar shigar ruwa biyu tana wakiltar fasahar gina ginin da ta ci gaba wacce ke amfani da hanyoyin ruwa guda biyu masu zaman kansu har zuwa lokacin shigarwa, wanda ya bambanta da tsarin shigar ruwa guda ɗaya na gargajiya. Wannan rukuni na na'urorin an tsara shi musamman don aikace-aikacen tushe mai zurfi wanda ke buƙatar kulawa mai kyau akan halayen haɗin ruwa, kwayoyin amsa, da halayen shigarwa. A cikin ginin bangon ƙasa da ginin katanga, fasahar shigar ruwa biyu ana amfani da ita a cikin ayyukan gina jeti don ƙirƙirar ginshiƙan ƙasa-cement, gina katanga masu hana ruwa, daidaita ƙananan ƙasa, da tallafawa ginin bangon diaphragm da shahararrun ginshiƙai. Hakanan ana amfani da na'urar a cikin tsarin sarrafa permeability don gine-ginen ƙasa da kuma a cikin aikace-aikacen haɗin ƙasa-da-ruwa na musamman inda rarraba abubuwan ruwa har zuwa shigarwa ke da mahimmanci ga aiki. Ka'idar aiki ta shigar ruwa biyu tana haɗa da kiyaye tsarin ruwa guda biyu masu zaman kansu—yawanci ginin siminti na farko da ruwa na biyu kamar ruwa, masu hanzarta sinadarai, ko haɗin haɗin gwiwa—duk suna da famfo, auna, da sarrafa matsin lamba masu zaman kansu har zuwa haɗuwa a wurin shigarwa. Wannan rarrabewar tana ba da damar sarrafa daidaito na haɗin, kwayoyin ruwa, da halayen jeti waɗanda zasu kasance da wahala ko kuma ba za a iya cimma su ba tare da tsarin ruwa guda ɗaya da aka haɗa. Ana iya shigar da ruwan biyu a ƙarƙashin matsin lamba, saurin gudu, da sauri daban-daban, wanda ke ba da damar kwangila su inganta zurfin shigarwa, diamita ginshiƙi, rarraba kayan, da haɓaka ƙarfi na ƙarshe don yanayin ƙasa na musamman. A cikin aikace-aikacen gina jeti, tsarin ruwa biyu yawanci suna bayar da slurry na siminti da ruwa ta hanyar nozzles masu jujjuyawa ko na jujjuyawa, suna haifar da tasiri mai sarrafawa da tasirin gurbatawa wanda ke haɗa ƙasa tare da kayan haɗin gwiwa yayin da yake kiyaye daidaitaccen radius na tasiri. Tsarin na'urorin a cikin wannan rukuni yawanci sun haɗa da na'urorin shigar ruwa biyu da suka ƙunshi famfo guda biyu masu zaman kansu tare da tsarin samarwa masu zaman kansu, tarin nozzles da aka tsara don haɗin ruwa na coaxial ko jere, tsarin manifold don sarrafa matsin lamba da gudu masu zaman kansu, da kuma allon sarrafawa da aka haɗa don daidaita ƙa'idodin shigarwa. Nau'in na'urorin da aka saba sun haɗa da tsarin shigar ruwa biyu na auger don shigarwa mai zurfi, na'urorin juyawa da ke daidaita don bayar da ruwa biyu, da kuma na'urorin hakowa na musamman da aka kera tare da damar shigar ruwa biyu don ƙirƙirar ginshiƙai masu diamita mai girma. Zaɓin na'urar shigar ruwa biyu yana dogara ne akan abubuwa da yawa na fasaha: rarraba ƙasa da tsarin ƙasa, zurfin magani da ƙayyadaddun diamita na ginshiƙi, nau'ikan ruwa da ƙayyadaddun viscosity, buƙatun matsin lamba da gudu, iyakokin samun dama a zurfin shigarwa, manufofin samarwa, da bin ƙa'idodin injiniya da suka dace. Zaɓin na'urar ya kamata kuma ya yi la'akari da ƙuntatawar wurin da suka haɗa da iyakokin hayaniya, iyakokin girgiza, da buƙatun kariya daga muhalli don wuraren birni ko masu laushi. Ka'idojin da suka dace sun haɗa da EN 14679 (Aikin Ayyukan Geotechnical na Musamman—Jet Grouting), EN 12716 (Aikin Ayyukan Geotechnical na Musamman—Grouting), ASTM D6330, da ƙa'idodin DIN na yanki don na'urorin grouting da hanyoyin. Ka'idojin kayan yawanci suna ambaton jerin EN 12350 don daidaiton grouting da halayen gudu kuma na iya haɗawa da buƙatun tabbatar da inganci na musamman na aikin don haɓaka ƙarfi da aiki na permeability.