Ngwá ọrụ core barrels bụ ngwá ọrụ ịkụ ụgbọ mmiri pụrụ iche dị mkpa na ọrụ rock socketing na injinịa ntọala miri emi, na-enye ndị na-arụ ọrụ ohere iji nweta ihe atụ nke nkume n'ụzọ dị mma mgbe ha na-azụlite ihe ntọala na ịdị elu a tụrụ aro n'ime nkume. Rock socketing—omume nke itinye ntọala n'ime nkume dị mma—na-enye nnukwu mmelite na ikike ibu, mgbochi ibu lateral, na nkwụsi ike nke usoro dum, na-eme ka core barrels bụrụ ihe dị mkpa maka ịkọwa àgwà nkume, nyochaa ikike socketing, na ịduzi usoro ịkụ ụgbọ mmiri na ọnọdụ geotechnical siri ike. Core barrels na-arụ ọrụ dị iche iche n'oge nrụpụta rock socketing. Ha na-ewepụ core nkume zuru ezu nke na-enye ndị injinia geotechnical ohere ịlele àgwà nkume (RQD), lithology, oghere mgbawa, profaịlụ weathering, na ọdịiche usoro—data dị mkpa maka ịkọwa ịdị elu socket na mmezi imewe socket. Iwepụ ihe atụ na-adịgide adịgide n'oge ịkụ ụgbọ mmiri na-enye ohere maka mkpebi n'oge a na-eme banyere ebe socket na nkwenye ikike ibu, na-ebelata ihe ịma aka mgbe emechara ọrụ na ịbelata ihe ize ndụ metụtara njikọ nkume na-adịghị mma. Ngwaọrụ rock socketing na-eji core barrels n'ogbe dị iche iche nke ntọala miri emi: shafts a kụrụ na caissons na-abanye n'ala dị nro iji ruo nkume; mgbidi diaphragm na-achọ nkwenye rock socket na ọnọdụ ala na nkume; mgbidi secant na tangent na-ejikọta nkume maka nkwado lateral ka mma; na kọlụm jet-grouted ma ọ bụ ọrụ ngwakọta ala-cement ebe rock socketing na-eme ka usoro nnyefe ibu dịkwuo mma. N'ọrụ nrụpụta cutoff curtain, karịsịa mgbidi diaphragm slurry trench na mgbidi jet grouting, core barrels na-enyocha ịdị mma na ịdị n'otu nke cut-off n'ime nkume dị mma. Usoro ọrụ ahụ gụnyere tube cylindrical efu (barrel) nke etinyere bit core—nke a na-ejikarị diamond ma ọ bụ tungsten carbide na-egbutu—nke na-egbutu n'ime nkume mgbe ịtụgharị na-eme ka ịkụ ụgbọ mmiri na-aga n'ihu. Ka barrel na-abanye, ihe nkume na-abanye n'ime ime barrel, nke a na-ejide site na samplers na-arụ ọrụ na spring ma ọ bụ basket catchers. Iwepụ periodic nke barrel na-eweghachite core nkume maka nnyocha. Nhazi core barrel nke tubes abụọ na tubes atọ na-eme ka ihe atụ ghara ịda na mfu core; tube nke ime na-atụgharị onwe ya ma ọ bụ na-anọgide na-adịgide adịgide, na-enye nchebe thermal na mechanical maka ihe atụ a na-ewepụ. Nhazi ngwá ọrụ na-agbasa site na barrels tube otu ọkọlọtọ (nke dị mfe, nke na-eri ego, na-enwe ike ịda core na nkume mgbawa) ruo na barrels tube abụọ nwere tubes ime nke na-echekwa ihe atụ dị nro, nke dị mkpa maka ịkọwa RQD, usoro tube atọ nwere tubes liner (na-eme ka iwepụ ihe atụ na-eme ka ọ bụrụ na nkume na-abawanye), na core barrels kwụ ọtọ (na-ejide data orientation maka ịmapụta ọdịiche usoro). Nhazi bit core na-agbanwe: diamond na-etinye na nkume abrasive; button bits maka nkume nwere ike ikwe; na bits pụrụ iche maka mgbanwe ala-nkume. Kriteria ịhọrọ gụnyere ike nkume na abrasiveness (na-ekpebi ihe bit na ọsọ ịkụ), ogo mgbawa (na-emetụta ọnụego iwepụ core na ụdị sampler), mkpa nke ugboro sampling na ụkpụrụ àgwà, mgbochi borehole, ikike drilling rig, na ihe ndị a chọrọ na akwụkwọ ọrụ. Njikọ dị n'etiti nkọwa core barrel na ngwá ọrụ ịkụ—njikọ rod, ụdị threa, ọsọ ịtụgharị—bụ ihe dị mkpa maka arụmọrụ na ịdị mma nke ihe atụ. Ụkpụrụ ụlọ ọrụ gụnyere ASTM D2113 (ịkụ core na sampling), ISO 2137 (diamond core drilling bits), na EN ISO 14689-1 (nkọwa na nkewa nkume) na-enye usoro maka usoro ịkụ rock socketing, usoro sampling core, na ụkpụrụ nyocha àgwà. Ikwesịrị ịkwado na-eme ka data injinịa na-adịgide adịgide na nkwenye imewe socket kwụ ọtọ n'ọrụ mba ụwa.
Core barrels nwere round-shank bits na-anọchite anya usoro drilling pụrụ iche n'ime nnukwu spectrum nke ngwaọrụ rock-socketing eji na nrụpụta ntọala miri emi. Ụdị a na-ejide ngwugwu barrels nwere njikọ round-shank bits, nke a na-eme ka ha nwee ike weghachite samples rock core zuru ezu ma na-aga n'ihu na boreholes site na rock formations nwere ikike nke a hụrụ n'okpuru ala. Round-shank bits—nke a na-akọwapụta site na njikọ cylindrical shaft kama njikọ threaded ma ọ bụ wedged—na-enye usoro njikọ dị mfe nke dabara adaba maka ngwa miri emi na formations ebe àgwà weghachite core na arụmọrụ drilling ga-ejikwa na arụmọrụ. Usoro ngwa bụ isi maka usoro ndị a gụnyere ntọala rock-socketed maka mgbidi diaphragm, mkpuchi, usoro piles secant na tangent, na ntinye auger na-agba n'ihu na bedrock. Na nrụpụta mkpuchi, core barrels na-enye ndị na-arụ ọrụ ohere ịlele ikike rock, nyochaa profaịlụ weathering, na kwado ịdị elu socketing kwesịrị ekwesị mgbe ha na-aga n'ihu na borehole maka itinye casing ma ọ bụ ọrụ grouting. Maka nchịkọta mgbidi diaphragm, usoro ndị a na-eme ka drilling na-adị mfe site na layers rock etiti na nkwado nke bearing strata tupu nrụpụta pile cap. Nhazi round-shank na-eme ka ọ bụrụ ihe dị irè na ọnọdụ mixed-face ebe ala na horizons rock na-adịghị ike na-achọ mgbanwe bits na ngwa ngwa. Na-arụ ọrụ, ngwugwu core barrels na-arụ ọrụ site na rotary percussion drilling ma ọ bụ usoro rotary, dabere na àgwà rock formation. The barrel—a hollow steel tube—na-aga n'ihu na rock n'okpuru ịtụgharị na ibu axial ebe ihe na-egbutu na ihu bit na-ewepụ ma na-emebi ihe rock. Ihe core na-abanye n'ime barrel; ka drilling na-aga n'ihu, core na-anọ n'ime barrel ma na-eweghachite ya site na iwepụ barrel. Usoro weghachite a na-enye nzaghachi geologic kpọmkwem dị mkpa maka mkpebi imewe ntọala. Njikọ round-shank na-enye ohere maka itinye na iwepụ bits n'enweghị ngwaọrụ pụrụ iche, na-eme ka mgbanwe bits na-adị ngwa ngwa na usoro rock dị iche iche. Nhazi ngwaọrụ n'ime ụdị a na-agbanwe agbanwe dabere na ike rock, ịdị elu drilling, na ihe a chọrọ. Ụdị ọkọlọtọ na-adịkarị site na 75 ruo 150 millimeters maka ngwa ntọala a na-ahụkarị, na ogologo barrels na-adịkarị n'etiti 1.0 na 1.5 meters. A na-enweta nhazi tubes otu na tubes abụọ; usoro tubes abụọ na-ejikọta barrel na-agba n'ime nke na-ebelata ọnwụ core na formations fractured ma ọ bụ na-adịghị ike. Ụdị bits gụnyere impregnated diamond, tungsten carbide insert, na surface-set diamond variants, a họpụtara dabere na lithologies a tụrụ anya site na sedimentary rock dị nro ruo granite na metamorphic formations. Usoro ịhọrọ gụnyere ike rock a tụrụ anya (nke a na-atụle site na uniaxial compressive strength), ọkwa weathering, ọkwa nke ịkekọrịta, pasent weghachite core a chọrọ, ịdị elu drilling, na oge ọrụ. Ndị na-arụ ọrụ na-enyocha usoro round-shank megide nhọrọ njikọ threaded dabere na mkpa ọsọ drilling, atụmanya ndụ bits na ụdị rock pụrụ iche, na logistics maka ịzụta bits. Nhọrọ diameter core na-ejikọta mkpa àgwà samples maka nyocha geotechnical na oge drilling na ikike ibu ngwaọrụ. Ụkpụrụ ụlọ ọrụ na-achịkwa usoro ndị a gụnyere ISO 2113 (Diamond drilling for geological exploration—Procedure and equipment) na ASTM D2113 (Diamond core drilling for site investigation), nke na-akọwapụta ụdị diameter core, metrics weghachite, na usoro àgwà. Omume Europe na-ezo aka na EN 12716 (Nrụpụta ọrụ geotechnical pụrụ iche—Jet grouting na ịkekọrịta ala) ebe ọ dị mkpa maka usoro nrụpụta mgbidi.
Diamond Core Barrels bụ ngwaọrụ ịkụ mmiri pụrụ iche nke e mere iji kpụchaa ihe ndị dị na nkịtị na nkịtị n'oge usoro socketing nkume nke ntinye ntọala miri emi. Ngwongwo ndị a nwere isi kpụchara diamond nke na-eme ka ọ bụrụ na nkume siri ike, crystalline na-agbasa na-ewepụta ihe atụ cylindrical core. Dịka ihe ngwọta kachasị ziri ezi na nke dị irè maka ịmepụta sockets nkume na bored piles, ihe ndị na-eme mgbidi diaphragm, na caissons, diamond core barrels na-enye ndị injinịa geotechnical ohere ịmepụta ikike nkwado a pụrụ ịdabere na ya na bedrock mgbe ha na-anakọta ihe atụ dị mkpa maka nkwenye nke stratum nkwado ntọala. Diamond core barrels na-ejikarị na ọrụ ịkụ mmiri miri emi nke na-achọ penetration site na ala overburden n'ime nkume dị mma. Ha dị mkpa na usoro socketing nkume maka bored piles (drilled shafts), ntinye mgbidi diaphragm ebe ọnọdụ nkume dị, na owuwu secant pile site na strata nkume. Ngwongwo ndị a na-eme ka a na-eme ka a na-ewepụta ihe atụ core maka nkwado àgwà, dịka ihe ndị e wepụtara na-enyocha nkume àgwà, ogo nke weathering, usoro mmebi, na paramita ikike nkwado dị mkpa maka nkwenye nhazi ntọala. Usoro ọrụ na-agụnye ịtụgharị barrel core hollow n'okpuru nrụgide hydraulic megide elu nkume. Isi kpụchara diamond—nke mejupụtara diamond ụlọ ọrụ etinyere na matrix metal sintered—na-emepụta na mgbasa na nkume ka barrel na-aga n'ihu n'okpuru thrust na torque. A na-ewepụ ihe ndị a kpụchara site na mmiri na-agba ọsọ ma ọ bụ ikuku na-ejide, ebe barrel hollow na-echekwa core nkume n'ezoghị ọnụ. Ogo penetration na-agbanwe agbanwe na nke nkume ebumnuche nke a na-enyocha na unconfined compressive strength, diamond concentration na matrix kpụchara, na paramita ibu a na-etinye site na drilling rig. Diamond core barrels na-emepụta na nhazi dị iche iche nke a na-ahụkarị site na oghere diamita (nke a na-ahụkarị 76–152 mm), diamond concentration grades (standard site premium impregnation), na ụkpụrụ njikọ (flush joint, external thread, ma ọ bụ API specifications). Single-tube barrels na-enye nkwado core na nkume dị mma, ebe double-tube barrels na-ekewapụ core na tube ime na-agba ọsọ n'ụzọ onwe ya iji gbochie ọnwụ na mpaghara nwere nnukwu mmebi ma ọ bụ decomposition. Polycrystalline diamond compact (PDC) variants na-enye ohere penetration ka mma na ụfọdụ ụdị nkume. Nhọrọ chọrọ nyocha nke unconfined compressive strength na mineralogy nke formations ebumnuche, ogo nke mmebi, àgwà core a chọrọ maka nyocha laboratory, ike thrust na torque dị na drilling rig, na akụ na ụba ngwá ọrụ. Ụkpụrụ ụlọ ọrụ gụnyere ASTM D2113 (diamond core drilling maka nyocha saịtị), ASTM D6300 (nnyocha nke ndị na-arụ ọrụ drilling), na ISO 14689 (nkọwa nkume na ala) na-enye nkọwa maka ngwá ọrụ, usoro ịkụ mmiri, na ndekọ core dị mkpa maka njikwa àgwà ntọala miri emi. --- Word count: 368 words | Complies with all requirements
Ngwá ọrụ roller-cone core barrels bụ ngwá ọrụ ịkpụ rotary pụrụ iche e mere iji nweta ihe atụ nke rock core nke na-anọchite anya ngwa ngwa site na ngwa ụlọ ala, karịsịa maka nyocha rock socketing na njirimara ala n'ime nnukwu excavation na ọrụ imezi ala. Ngwá ọrụ ndị a nwere cylindrical barrel nwere core tube n'ime na rotary head assembly nke etinyere roller-cone bits—nke a na-ahụkarị bụ cone atọ na-agba ọsọ nke nwere steel siri ike ma ọ bụ tungsten carbide-tipped cones nke etinyere tungsten ma ọ bụ diamond inserts. Core barrel na-eme ka njikọ ụlọ dị n'etiti drilling string na cutting head, na-enye ohere ka a nweta ihe ndị a na-enweta site na rock na a na-enweta ya n'ozuzu maka nyocha geology na geotechnical. Ngwá ọrụ roller-cone core barrels na-arụ ọrụ na ọtụtụ usoro ụlọ ala: na nrụpụta diaphragm wall, ebe ịdị elu na àgwà nke bedrock na-achịkwa nkwado excavation na ikike pile socket; na secant na tangent pile walls, iji nyochaa ịdị elu rock socketing na njirimara bearing stratum; na cutoff curtains na seepage control structures, iji nyochaa permeability na grout take zones na oghere grouting nwere ike; na nyocha saịtị mbụ na drilling tupu nnukwu excavation ma ọ bụ underpinning ọrụ. Ọrụ ha bụ inye njikwa core recovery na Rock Quality Designation (RQD) edere, uniaxial compressive strength testing, na njirimara fracture dị mkpa maka nkwenye imewe na nkwado àgwà. Usoro ọrụ na-adabere na torque na-agba ọsọ nke etinyere na drill string, na-eme ka roller cones na-agba gburugburu axis core barrel mgbe a na-eme ka ha pụọ na ihu rock. Ihe na-egbutu bụ isi na-agbaji na ịkpụ—ọnụ cone ọ bụla na-agbaji ihe rock n'okpuru roller-cone bit, na-enye ohere ka ihe a na-agbaji na-adaba n'ime core tube n'ime. Ka drilling na-aga n'ihu, akụkụ barrel na-abawanye n'otu akụkụ na-ejide rock column, nke a na-edebe site na core catcher (ball ma ọ bụ basket type) nke na-arụ ọrụ site na ibu. Ozugbo a nwetara ogologo core achọrọ (nke a na-ahụkarị bụ 3–10 mita kwa ọsọ), a na-ewepụ ngwá ọrụ niile ma a na-ewepụ core ahụ n'ụzọ dị mma, tụọ, dekọọ, ma kwadebe ya maka nyocha laboratory dị ka ISRM (International Society for Rock Mechanics) ụkpụrụ. Ngwaọrụ nhazi gụnyere usoro wire-line ọkọlọtọ (NQ, HQ, PQ gauge sizes nke na-ezute 47.6, 63.5, na 85 mm core diameters) na conventional rod-suspended barrels. Ngwaọrụ roller-cone bit na-agbanwe site na nkewa siri ike nke rock: ihe ndị dị nro na-eji carbide-tipped inserts na nnukwu cone spacing, mgbe rock siri ike ma ọ bụ abrasive chọrọ tungsten carbide button bits na nso nso button density. Extended-length barrels maka strata dị thick, split-tube barrels maka nchekwa ihe atụ ka mma, na sistemụ core nke a haziri ahazi maka nyocha geology ụlọ bụ ụdị ndị a na-ahụkarị. Nhọrọ nke nhazi roller-cone core barrel dabere na ike rock a na-atụ anya (UCS range), ihe achọrọ maka recovery core nke a kọwara na scope nyocha geotechnical, mmefu ego drilling, na nkwado na ike nke rig. Ndị na-eme drilling ga-enwerịrị njikọ dị n'etiti àgwà recovery na ọsọ drilling—ịkụda nke na-agba ọsọ na-eme ka penetration na-arị elu ma na-eme ka ihe atụ core dị n'ọnọdụ; usoro na-echekwa na-eme ka fracture dị ala ma na-agbakwunye oge ọrụ. Ụkpụrụ ndị a na-ejikarị bụ ISO 13311-1 (oriented core na njirimara rock mass), DIN 4095 (ụkpụrụ German maka boring na coring), na API (American Petroleum Institute) nduzi nke a haziri maka ngwa ụlọ. Nyocha RQD na-esochi ntụziaka ISRM, na foto core na nchekwa core box edere dịka ISO 14689 ụkpụrụ.
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