Bits DTH da Ring Bits

Kayan aikin hakowa na Down-the-hole (DTH) da ring bits suna wakiltar muhimman kayan aikin hakowa a cikin ayyukan hakowa na tushe mai ƙarami, musamman don gina bangon ƙasa, labule masu katsewa, da sauran abubuwan tushe masu zurfi. Waɗannan kayan aikin yankan na musamman suna da mahimmanci ga injiniyan ƙasa na zamani, suna ba da damar hakowa mai inganci da araha a cikin aikace-aikacen injiniyan tushe da ke buƙatar ingantaccen tsarin hakowa da aiki mai ɗorewa a cikin yanayi daban-daban na ƙasa. DTH bits suna aiki a matsayin kayan aikin hakowa na bugun jini tare da DTH hammer units, suna isar da ƙarfin tasiri kai tsaye a fuskar bit don yanke dutsen da ƙasa mai ƙarfi. Ring bits, waɗanda aka bayyana da saman yankan su na annular tare da ƙarfe mai ƙarfi ko tungsten carbide, an ƙera su musamman don aikace-aikacen hakowa na diamond-core ko buɗaɗɗen rami. A cikin mahallin injiniyan tushe, ana amfani da waɗannan bits a cikin gina bangon diaphragm da labule masu katsewa—katsewar ƙasa mai ci gaba da aka yi amfani da ita don sarrafa ruwa ƙasa, hana zubar ruwa, da tallafawa nauyi a gefe. Aikace-aikensu yana faɗaɗa zuwa gina secant pile, inda rami masu jujjuyawa, da aka hakowa daidai, ke ƙirƙirar abubuwan gina da ke ɗaukar nauyi, da shigar da bango na takarda wanda ke buƙatar hakowa na rami na jagora. Aikace-aikacen tushe na musamman suna kuma haɗawa da ramin gwaji na jet grouting da hakowa na ginshiƙan haɗin ƙasa, inda DTH bits ke ba da inganci da saurin shigarwa da ake buƙata don hanyoyin inganta ƙasa. Ka'idar aiki tana dogara da nau'in bit da yanayin ƙasa. DTH hammers suna ba da bugun jini mai sauri da aka tsara—yawanci 1,500–2,500 bugun jini a kowace minti—suna canja wuri ƙarfin juyawa ta hanyar bit zuwa ƙasan rami. Ring bits suna dogara da ƙarfin juyawa da aikin bugun jini don ƙirƙirar aikin yankan da fashewa a kan iyakar ƙirƙira, tare da tsarin ring yana ba da damar fitar da kayan daga cikin tsakiyar ramin. Tsarin cire yankan yana bambanta: juyin iska yana fitar da yankan a cikin hakowa na iska, yayin da juyin laka (don ring bits) ke jigilar kayan da aka yanke zuwa saman, yana ba da damar ci gaba da rubutun hakowa da rajistar ƙirƙira. Nau'in kayan aiki a cikin wannan rukuni sun haɗa da DTH percussion bits na al'ada tare da nau'ikan ramin wanke-wanke daban-daban (yawanci rami 6 zuwa 16) da aka tsara don takamaiman samfuran hammer; button bits suna haɗa da tungsten carbide inserts a cikin jikin matrix don ƙara juriya ga gajiya a cikin ƙasa mai gajiya; da ring bits a cikin duka buɗaɗɗen diamita da tsarin barrel don hakowa mai sarrafawa. Diamita na bit yana daga 75 zuwa 200 millimita don aikin tushe mai ƙarami, yana dacewa da ƙayyadaddun ƙira na tushe da girman ramin DTH hammer. Ka'idodin zaɓi don DTH da ring bits sun haɗa da rarraba ƙasa (ƙasa, dutsen da aka yi wa juyawa, dutsen mai ƙarfi, da ƙasa mai bambanci), buƙatar saurin hakowa, buƙatun kwanciyar hankali na rami, da tsarin casing. Masu kwangila suna tantance farashin rayuwar bit bisa ga saurin shigarwa da ake tsammani a cikin ƙasa da aka yi hasashe, ƙimar ƙarfin bugun jini na samfuran hammer da ake da su, da buƙatun matsa lamba. Abubuwan yanayi—ƙarfin ruwa ƙasa, yanayin zafi a cikin aikace-aikacen yanayi sanyi—suna shafar zaɓin kayan, tare da matrices masu ƙarin cobalt da tsarin resin na musamman suna ba da ingantaccen aiki a cikin yanayi masu lalata ko yanayin zafi mai ƙanƙanta. Ka'idodin da suka dace da ke jagorantar aikin hakowa na DTH sun haɗa da ISO 13143 (hakowa na bugun jini don piles), DIN 4098 (gine-ginen bangon diaphragm), da EN 1538 (bangon diaphragm da aka aiwatar a cikin ƙasa). Ka'idodin API don ruwa da tsarin laka (API 65) suna tabbatar da dacewar juyin juyawa, yayin da ƙayyadaddun masana'antun ke bayyana ƙa'idodin aiki don dacewar hammer-bit da inganta aiki, suna tabbatar da ingancin rami mai ɗorewa a cikin ayyukan injiniyan tushe.