Thong tin khoa hoc cong nghe md NGHIEN Gl)U SITDUNG NEO BE TONG ONG HOT (CONCRETE SPLIT SET BOLT) de chong giiif Ciic duong lo trong dieu kien moi tmcttig mo phiifc tap So far, anchor bolts have been[.]
Thong tin khoa hoc cong nghe m d NGHIEN Gl)U SITDUNG NEO BE TONG - ONG HOT (CONCRETE-SPLIT SET BOLT) de chong giiif Ciic duong lo dieu kien moi tmcttig mo phiifc tap So far, anchor bolts have been considered as a lightweight supporting structure, meeting the requirements of the stability safety and cost price of the support material in the mining industry In this paper, the authors introduce the research results on the utilization of the anti - corrosive tubing bolts in supporting the drifts under the complicated conditions Neo ong hd (Split set bolt) [7], [9] Id mgt nhdng loai neo ldm vige theo nguyen t i e ma sat todn than, cd kha nang tilp nhan tai vd ldm viec vdi da vd khoi dd sau lap dat, d u tao dan gian, thi cdng d l ddng, khdng ddi hdi dau ty trang thilt bj, vat lieu dac chung, phu hgp trinh cdng nghe vd thilt bj thi cdng s i n cd cua cac md ham 16 Quang Ninh Nam 1996, Trung tam Thye nghiem vd Chuyin giao Cdng nghe mdi Vien Khoa hgc Cdng nghe Md - Vinacomin da hgp tac vdi Xi nghiep san xuit than Cdng ty than Dyang Huy nghien cdu dp dung thd nghiem "Cong nghe neo ong va be tdng phun " tai 16 xuyen via +100 khu Nam Khe Tam [1] I Cdu tao va nguyen t i e lam viec cua neo dng (split set bolt) Nguy§n ly lam viec cda neo Cdc loai neo dygc san xuat td vat lieu khde vd dya tren tinh chit cua vat lieu md d u tag vd tinh nang ldm viec cua neo vdi dd vd khIi da khdc Tuy nhien, dCi dygc san xuit td loai vat lieu ndo, tinh nang ldm viec gida neo vd da vd khIi da van cd nhdng dac diem chung, dd Id: Cd kha nang chdng gid tich eye, huy dgng dygc khoi da quanh dydng 16 cung tham gia bao ve dydng Id trydc sy biln dang vd chuyin djch ty vdo khoang khdng gian dydng Id Tyang ty neo chit deo elt thep, neo ca hgc, neo hd Id loai neo ma sat todn than Neo cd kha nang mang tai sau lap vdo Id neo dygc via 11 +100 umKhe Tam *Ktfwrtw»wjfc|j|ri»gMq»^^ via 10 ^ Hinh Doan Id dp dung neo dng h& mCtx; +100, khu Khe Tam, md than Dwong Huy KHCNM s o 8/2014* CNKT HAM LO TS PHAM MINH D d c TS Le VAN C O N G KS LLTU C O N G NAM KS PHI VAN LONG Vidn Khoa hQC Cdng nghd Md - Vinacomin Bidn t$p: TS Ph^m Minh DCrc thi cdng bang may khoan tiln gyang vd sd dyng khoan tiln gyang d l dya neo vdo vj tri Neo ong hd ldm viec tren nguyen tac ma sat nhy cac loai neo ma sdt vd neo bam dinh khac nhy: Neo ma sat (ma sdt todn than hoac ma sat dilm); Neo bdm dinh (bam dinh todn thdn ho|e bam dinh dilm) 6" day, neo ong hd dya vdo nguyen t i e dan hIi cua t i m thep cd b i n vd kha nang ddn hoi cao dygc eugn lai thdnh ong trdn hd Khe hd gida mep t i m thep Id khoang d l ong lap vdo Id khoan djch chuyin Nguyen ly ldm viec gida neo vdi dd vd khoi dd quanh dydng Id, bao gom: - Nguyen ly tree; Nguyen ly ban; Nguyen ly khod neo Nhy vay, cd t h i rut nhdn djnh rang, neo Ing hd (split set bolt) Id mgt lo^i neo cd d u tpo bang vat lieu kim loai, lien k i t gida neo vdi da vd khIi da Id ma sat todn than dygc san xuit td cdc thep t i m , dap dng cac yeu d u ve ky thu|t nhy b i n nen cua thep, chieu ddi vd dydng kinh ong neo dap dng cdc yeu d u ve kha nang mang tai, tinh d l thi cdng, sy thuan Igi trang bj may mdc phye vy thi cdng dya tren tay nghi vd trinh dgi thg, dac bigt gid thdnh khdng cao Neo ong hd (Split set bolt) khde vdi neo bam dinh vd neo ma sat khac d kha nang mang tai Sy mang tai cua neo I n g hd dya vdo hg s l ma sat gida ong thep vd lye ma sat dygc tao Thong tin khoa hpc cong nghe m o todn bd neo 1600mm, dd, chilu ddi doan dau neo dygc vat dang hinh cdng 40mm, chilu ddy t i m dem dudi neo 20mm Tai trgng neo phy thugc theo chilu ddi dygc [6] thi nghiem vd gidi thieu tai bang Hien nay, tren t h i gidi, neo Ing hd dygc san xuit theo qui trinh vdi cac qui djnh chat che dygc due rut td cac kit qua thi nghiem vd thd nghiem hien trydng Nhilu hang nhy Jennmar, Minova, International Rollforms Inc [6] [7]v.v d i u sd dyng cac loai thep tam cd bin nen 420MPa, bin keo 480MPa, kha nang dan ddi khdng Idn han 19% 6i san xuat neo ong hd Cau tao va mot so dac tinh ky thuat cCia neo ong ho (split set bolt) Hien nay, tren the gidi cd nhieu hang cung d p vat lieu chong 16 danh tilng nhy: Jennmar, Minova, Intemational Rollforms Inc Tai hinh 3, bang 1, bang 2, gidi thieu d u tao vd kich thydc cua neo Ing cua mgt so hang tren t h i gidi Kich thydc va chat lieu vat lieu Id nhdng dac dilm mang tinh ky thuat ma mdi hang san xuit de xuit Thi du, hang Jennmar san xuit neo cd dydng kinh 34, 41, 47mm, dd, hang International Rollform Inc san xuit neo dng dydng kinh ngodi 33, 39, 46mm II D i l u kien va kha nang chdng giu' cua neo dng h d Ldn dau tien (1996) [1], tai md than Dyang Huy Quang Ninh sd dung neo Ing hd Dydng Hinh Nguyen tdc lam viec cua dng thdn neo v&i da vd khdi dd t i m thep bj u l n cong Do dd, tai trgng cua neo lien quan d i n chilu ddi hay dien tich tilp xuc gida ong neo vdi thdnh Id khoan neo [6] Khe hd gida hai mep tam thep vi vay ddng vai trd vd y nghTa quan trgng Theo qui chuan cua Trung Qudc, neo Ing hd sd dyng tai khu Khe Tam md Dyang Huy cd chilu rdng khe hd dao ddng td Hinh Cdu tao neo dng 8-12mm, dydng kinh neo 42±1 mm, chilu ddi Bang Ddc diim ky thudt cOa neo dng hang Jennmar sdn xuit Kich thirds chuan neo ma sat 34mm 41mm 47mm Du-ong kinh ngo^i nhd nhat 34mm 41mm 47mm Sai so du-gng kinh 0,5mm 0,5mm 0,5mm Chi§u dai neo 0,3-3m 0.6-3m 0,6-3m 30-32mm 37-39mm 43-45mm Dp ben nen t l i thieu 420MPa Supraform 420 420l\/IPa 420MPa Do ben kdo toi thieu 480MPa 480MPa 480MPa 19% 19% 19% Ou-dng kinh Id khoan l i p neo Vdt lidu Dp ddn dai KHCNM s d 8/2014* CNKT HAM LO Thong tin khoa hoc cong nghe m o Bdng Ddc tinh ky thudt neo dng hang Inter-thanh neo ong suit thdi gian ton tai van hdnh md, ngodi chit lygng cua thep ong neo vdi national Rollform Inc sdn xuit sy tinh khilt cua nd, d n sd dung cac giai phdp Ban Ky FL-33 FL-35 FL-39 FL-46 Kich thw&c phdng ngda, ngan chan ching dxy hda Idrn mdn hieu thep Dd Id cdc giai phap nhy san phu b l mat, Dufimg kinh ngoai 6ng than 46 39 33 35 mm A neo cdn bang ion bang thilt bj dien v.v Oipdyng kinh B 11-16 15-19 14-19 21-23 mm Do Idn tai trgng cua neo bdm dinh, neo ma Bu-dcng kinh ngo^i (Jogn sat ndi rieng vd neo ndi chung khdng ehi lien 41 30 30 30 mm C diu neo quan d i n tinh chit ca hgc cua thep md eon lien Kich thirdc v^nh dau 6ng 2±1 D mm quan mat thilt d i n b i n vd cac dac diem ca neo (chieu day t i m t6n) , >,' A ^A uAô +ãôôô rTAi hoc cua khIi dd quanh than neo Khi bin cua • ^ lo dyac chon ap dung da co dg ben tyang doi cao Td vach via 11 d i n tru via 10 gan 100m chu Bdng Tdi trgng cua neo (T/m) theo ket qud thi y l u Id: bgt vd cat kit Bgt kit c6 b i n nen 70- "9hidm cua [6] Tan/met RMR 90MPa, bin keo 4-8MPa, trgng lygng rieng 1.06 2,51-2,69g/cm3; cat k i t cd b i n nen 60 1.07 10 120MPa, bin keo 6-10 MPa vd trgng lygng 1.10 20 rieng 2,61-2,65g/cm3 Doan Id ching neo dng 2.07 30 tyang doi khd rao, chya cd hien tygng nydc 2.08 40 chay td thdnh Id vdo Thdnh phan vd tinh chit 2.53 50 hda ly nydc md dygc Bd mdn Dja chit Thuy van 2.66 trydng Dai hgc Md - Dja chit xdc djnh Nydc md 60 cd pH td 2,5 - 3,5 cd ten ggi sunfat magie vd 2.78 70 sunfat magie canxi Trong mdi trydng md ham 3.25 80 Id nydc ta khdng rieng gi md than Dyang Huy 3.30 90 nydc cd pH thip hay tinh axit cao Day Id dac 3.40 100 dilm chung nghien cdu tinh chit hda ly nydc md khu vyc Quang Ninh cua Vien Khoa hgc Cdng nghe Md Vinacomin d i u cho kit qua tyang ty Khi pH nydc md cdng thap thi tinh axit cdng cao hay tinh an mdn kim loai cua nydc md Idn Lye ma sat gida neo vd da cd tinh quylt djnh bdi bin cua vat lieu-thep gia cdng neo De dam bao sy I n djnh ddn hoi neo dng, t i m thep gia cdng thdn neo Ing d n ddn hIi cao nhyng phai I n djnh gida sy chit tai ban dau vd on djnh mang tai theo thdi gian D l dam bao tinh on dinh ca hoe vd ly hoe cua ,, , - r i - « ^x* ' Hinh Thi cong Idp ddt neo ong Bang Ddc tinh ky thudt neo dng h& cua Hdng International Rollform Inc Cdc chi tieu Dan vi FL-33 FL-35 FL-39 FL-46 Du-dng kinh doan d i u neo ti§u chuan mm 30/33 32/35 35/38 AM44 Tai trpng toi da T/T.m 12/10.88 12/10.88 14/12.70 20/18.14 Tai trpng toi thieu T/T.m 8/7.26 8/7.26 10/9.07 15/13.61 m 0,5-3,1 0,5-3,1 0,5-3,1 1,5-4,9 Chieu ddi tiSu chuan neo Ing hd Tai trpng ban dau T/T.m 3-6/2,72-5,44 3-6/2,72-5,44 3-6/2,72-5,44 6-10/5,44-9,07 KH( N VI SO 2014* CNKT HAM LO Thong tin khoa hpc cong nghe md dd quanh thdn neo thip, kha nang bdm dinh gida vat lieu bam dinh vdi da thip (bang 3) Jennmar (Friction-Lok- Stabilizer System) [7] gidi thieu kit qua danh gid kha nang mang tai cua neo ong hd mdi trydng d i t da md Trong do, quan tdm day du d i n sy biln doi bin cua mdi trydng da quanh than neo thdng qua chdt lygng khIi da RMR cd gid trj td khdng din 100, nhy bang (3) Nhy vay, neo be tdng I n g hd Id loai neo mang tai nhanh, dien sd dyng rgng, cd t h i ching gid an todn da cd bin nhd Theo kit ludn cua [1], kien eo f cua da td trd len, ehi tieu chat lygng khoi dd Q> 4; theo RMR>40, song cung nhy cac loai neo khac, khdi da neo d n CO mdc lien tue cao nhy ITnh vyc sd dung neo chit deo elt thep RQD> 40% III Tac dong cua thdi gian va mdi tru'ang din tinh dn djnh cua neo dng hd vd giai phap on djnh bin cua neo dng Cac k i t qua thi nghiem phdng thi nghiem [6] phan dnh rdt rd m l i quan he gida chit lygng khdi da, thdi gian ton tai neo vdi kha nang mang tai cua neo dng Trong mdi trydng md, nhat id md than, nhiet va am khdng Id nhdng tac nhan nguy hilm tdc ddng d i n tuoi thg cua vat lieu ching Id, dd, khong loai trd neo nhit Id neo Ing hd Hien nay, hau h i t cdc md than ham 16 Quang Ninh d i u nam dydi mdc nydc ty chay Dydng Id nam sau Idng dit, nhiet tyang ddi cao (29-32°C) Do am cac dydng Id hau hit d i u chilm 80- 90% Neo ong hd nhy da gidi thieu cd d u tao Id mdt trdn dang Ing hd Khi lap rap vdo khoi da quanh dydng Id, mdt mat Ing tilp xuc chat vdi da quanh thdnh Ing, mat ben Ing rong tilp xuc vdi khdng vd hai nydc Trong thyc t l thay rang, thep gia cdng ong neo it hoac khdng dygc phu Idp chdng ri Sy chenh lech nhiet khIi dd quanh Ing vd khdng Id thuc ddy d i n qua trinh an mdn kim loai cua Ing neo Trong mdi trydng cdc dydng 16 md, nhiet vd am khdng cao nen neo khdng nhdng chi bj an mdn dxy hoa md e6n bj an m6n dien hda Sy cd mat cua lyu huynh than, cua CO khdng v.v lam cho nydc md cd tinh axit nhy 110 SlO.O c f=8.0 c £"6.0 x.^ / / I 2.0 » 12 15 18 JJ :4 27 30 33 36 Dich chuyin theo th&i gian (H2SO4, H2CO3) gay an mdn hda hgc hay cdc chit nhy CO2, NO2, SO2 tao mdt Idp dung djch dien li phu len b l mat neo ldm xuat hien vd s l pin dien hod md dd sat (Fe) Id eye dm, C Id eye dyang Kim loai bj mdi chat lygng thep bj thay ddi qua trinh an mdn kim logi, b i n thep giam, ldm thay doi kha nang mang tai sy ddn hdi giam ddn Trong cdc dydng Id md, thdng gid Id dilu bat budc 6e gid, khdng sach (tyai) hod tan hoac day mdt lygng dgc (CH4, CO2, NO2, CO vv len mat dat Qud trinh thdng gid hinh thdnh cdc ddng d i i lyu cua khdng Khdng cd t h i chay ddng chay Idp hay ddng chay rli v.v vd ty lai nhdng vj tri ldi, ldm tren dydng Id Chong gid dydng Id bang neo ong hd, tdc Id da tao tren b l mat dydng Id nhdng h i ldm tich tu khdng vd hai nydc Sy tich tu khdng khdng dygc lyu thdng hay cdc chat an mdn kim loai se ldm cho b l mat neo bj an mdn Ngan chan qua trinh an mdn Id mdt ddi hdi nghiem tue td chit lygng kim loai d i n mdi trydng vd sy thdnh tao cdc vj tri tich tu ddc vd hai dm cao [8] Qua trinh khai thac md di ddi vdi viec khau than Id sy hinh thdnh cac khoang khdng gian rong Idng dat Da vach cac Id chg dygc pha hda, danh sap Sy chen l i p cua da vach keo theo sy biln dang cua cac tang da quanh Id chg vd anh hydng d i n cac dydng Id md Do dd, dp lye tdc ddng len cdc kit d u chong vd chuyin vj cua khoi da quanh dydng Id khdng ngdng biln doi Nhdng biln doi dd tac ddng d i n kit d u ching, nhit Id kit d u chong lien k i t dan xen gida khIi da vdi kit d u chong neo Cdc neo vi t h i de bj biln dang, nhdng biln dang ngoai lye ldm pha huy Idp bao ve b l mat Ing thep neo, ldm cho thep bj an mdn vd phd huy De ching lai sy thay ddi chat lygng thep theo KHCNM s o 8/2014* CNKT HAM LO Thong tin khoa hoc cong nghe md thdi gian vd mdi trydng, cung nhy tang kha nang ching chuyin vj tri khoi da quanh neo cd nhilu giai phdp nhy phu len be mat Ing thep mdt Idp son chdng ri Cdch ndy chi gid cho thep khdng bj an mdn hoa hgc nhyng khdng t h i bao ve trydc sy pha huy cua ngoai lye vd sy mdi cua thep (lyu biln) theo thdi gian T h y c t I sau nhieu nam ching gid neo Ing tai Dyang Huy thdy rang, mdt phdn neo bj an mdn dxy hoa, an m6n dien hda Mdt phan neo bj biln dang da ndc 16 bj sap dd cac hien tygng neu tren D l Ing thep gid dygc dan hdi vd khdng bj an mdn tac dgng cua mdi trydng vd thdi gian sd dung, tren t h i gidi dang sd dung mgt cdch hieu qua la kit hgp neo ong hd vdi be tdng tryang nd thi cdng neo Cdn ggi Id neo be tdng-dng hd (Concrete-Split set bolt) Nguyen tac cija phwang phap nhw sau: Thanh neo Ing dygc c h i tao theo tieu chudn ky thudt, sau khoan tao lo, sd dung bua hai (may khoan nen) ddng vao 6ng thep nhy mgt dang 16 xo, ddu neo dang thoi, dygc nen chat lai qua trinh lap dat vdo Id neo Cho bua khoan dap vdo chuoi d i n hydng (hinh 7) vdi t i c chdm, nhg nhdng ddy dng neo vao 16 neo Khi neo da dat dung chilu sau, ong neo dan tao lye ma sat lien kit khdi da lai vdi Dk Ing neo cang vd them lye ma sdt, nhdt Id gid cho lye can khdng bj suy giam tac dgng an mon vat lieu vd bj mdi, ngydi ta bam mgt lygng vda xi mang cd phu gia tryang nd vdo ong neo (hinh 5, 6) Dac tinh cua dung djch xi mang hay be tdng Id qua trinh thuy hod xi mang, mgt lygng nydc dung djch tham gia cac phan dng ddng ran be tdng Mdt lygng dy nhit djnh khIi se bay hai tao nen sy co ngdt Them vdo be tdng mgt lygng phy gia tryang nd hay chdng co ngdt (hinh 5) [3] se ldm cho be tdng khdng bj giam t h i tich hoac t h i tich tang len qua trinh ddng ran bd sung lye tryang nd len thdnh neo dng hd Nhy vay Ing thep neo se trd thdnh elt thep khIi da-be tong Be tong ddng ran khdng nhdng ehi gida vd tang lye nen ep td Ing neo md cdn cdch ly sy tilp xuc gida nhiet do, dm khdng vdi thdnh ong neo Khi do, thdnh Ing neo trd thdnh KHCNM S6 8/2014* CNKT HXM LO Hinh Bam dung djch be tdng trwang na "elt thep" be tdng elt thep Sy tryang nd cua be tdng ngan can hodn todn sy tham nhap cua nydc khoi da quanh than neo, ngan can sy tilp xuc cua than neo vdi moi trydng Phu gia be tdng thdng thydng la cac loai muoi nhy NaCI; CaCb hay Fe Cb la nhdng chit re tiln thydng dygc sd dyng phd biln xdy dyng Trong xay dyng gilng tai mgt so it md ham 16 cung da sd dung NaCI vd gidm an (CHa COOH) nhy mgt chit phu gia 6k ddng cdng be tong nhanh Song, ddy Id loai muli g l c cd tinh an mdn cao nlu sd dyng vdi hdm lygng Idn Trong be tdng tryang nd ngydi ta khdng sd dung cdc phu gia td cdc loai muli g l c md sd dyng cdc loai phu gia khong kilm cd g l c td tro bay nui Ida, tro bay nhiet dien Id cao dd, tro bay nhiet dien thu dygc t d cdc t i m hut tmh dien vd cd dien tich b l mat r i t Idn, din 5000cm2/g Thdnh phdn chinh thydng Id oxit silic (Si02), oxit nhdm (AI2O3), oxit cdc bon, oxit can xi do, oxit nhdm tdc dgng vdi xi mang phan dng thuy hod thydng sinh mgt lygng bgt hydro (H2) nhd li ti gdy sy tryang nd cho vda vd cd tinh on djnh, ching lai sy eo ngdt vd lang dgng cua be tdng qud trinh ddng ran [3] O nydc ta, da cd nhilu vien vd cdng ty san xuit cac loai phu gia chong eo ngdt vda be tdng nhy Cdng ty SIKA vdi loai phu gia IntraPlast-Z; Vien Khoa hgc Ky thuat Xay dyng (IBST); Lien hiep quang hod dign t d (IMAG) san xuit loai phu gia TR-01, TR-0-4, TR-02A, Cdng ty MAPEI vdi loai phu gia Expan Fluid hay Vitee-02 ,mgt logi phu gia hod deo co tinh nang bij tryang nd sd Thong tin khoa hoc cong nghe m o trydng md ham Id, dac biet mdi trydng nydc md cd pH thdp, tinh an mdn kim loai cao, neo cd k i t d u vdng chae, thi cdng thuan Igi, khdng yeu d u thilt bj, vat lieu neo phdc tap Ld mdt loai kit d u ching gid tich eye, neo Ing hd cd t h i gdp phdn ndng cao nang suit lao ddng tinh ca gidi hod vd ty ddng lap rdp cao Chi phi ddo, ching thap (giam khoang 2425% gid thdnh) so vdi ching gid bang vi ching thdng thydng Hinh Chudi djnh hw&ng sCr dung di lip rdp dng dyng be tdng chong co ngdt vdi gid ban phu hgp De bam dung djch be tdng tryang nd vdo Ing neo sd dyng thilt bj bam dang pit tdng De ddng ong neo vdo Id, sd dyng chudi djnh hydng lap rap neo I n g vdo Id khoan Chudi dygc gia cdng nhy mdt doan chodng ngan (hinh 7) Mdt dau gom cdc gide nhy dudi chodng, cd kich thydc phu hgp vdi may khoan nen, dau cdn lai cd chilu ddi t d 20-30em dygc don lai vdi kich thydc ldn han kich thydc dydng kinh neo Ing Vda xi mang cd t h i sd dyng loai ydt (tyai), hinh hoac cdc thdi xi mang cd chda phy gia tryang nd xi mang khd, hinh Khi sd dyng xi mang khd, ddng xong ong neo vdo Id neo, ngydi ta ngdm thdi xi mang khd vdo xd nydc 1530 gidy, dya thdi xi mang vdo ong neo vd dung thep trdn hoac chodng khoan xoay nhe 6k xi mang trdn d i u Thdi xi mang khd hang Minov san xuat vd cung dng tai Viet Nam Neo be tdng- ong hd Id loai k i t d u ching mang tai nhanh, gia cdng khdng phdc tap, vat ligu s i n cd nydc, s d dyng thilt bj thi cdng ddo Id thdng dyng nen gia thdnh cua mdt met Id ddo ching gid bang neo be tdng-Ing iid chi bang 75% so vdi dydng Id chong gid bang vi ching thep hinh (CBn-19) (theo dan gid nam 1996, [1],[2], gid thdnh chong neo Ing hd vd be tdng phun) Id t d 3.338.016,75d/mdln 4.400.190,75 d/m IV K i t luan Neo be tdng - Ing hd (Concrete- Split set bolt) Id loai neo mang tai tdc thdi sau lap dat neo, I n dmh v l tai trgng, b i n vdng mdi Neo Ing hd mdi chi dygc ching thd nghiem, vi vay, d n dygc dp dyng rdng rai vd sy ehi dao tich eye td cdc nhd quan ly cua Tap dodn Cdng neo nghiep Than Khodng san Viet Nam./ Tai lieu tham khao Pham Minh Ddc, Le Van Cdng, Ngd Van Sy, Tran Khac Thg, Nguyen Van Thjnh, Nguyin Van Dung: Bdo edo tong kit d l tdi "Nghien cun ap dung cong nghe neo ong va be tong phun tai Id xuyen via + 100 khu Nam Khe Tam" Vien Khoa hgc Cdng nghe Md, thdng 10/1996 Pham Minh Ddc: "Danh gia ket qua ap dung neo be tong cot thep chong giCr cac diiang 16 mo" Bao cao tai Hdi thao khoa hgc - Sdm San 1995 Nguyin Vilt Trung, Nguyin Ngge Long, Nguyin Ddc Thi Thu Djnh: "Phu gia va hoa chat dung cho be ton^ Nhd xuat ban Xdy dyng, Hd ndi 2004 Hydng ddn ddo ching Id da bang vi neo k i t hgp be tdng phun khd d cdc md than ham Id - T K V 2003 Lewis Martin., John Goris and Lauren Roberts, Disign and Testing of a Nondestructive friction bolt tester- Internet- 2014 J.R Player, E Vilaescusa & A G Thompson , DynamicTesting of Friction Rock Stabilisers., Weesstem Australian School of Mines, Kalgoorlie, West Australia, Australia-2014 w.w.w jenmmar com - Friction-Lok* Stabilizer System Dhanesh Chandra., Jaak J.K Daemen Corrosion research on rock bolts and steel set for subsurface reinforcement of the Yucca Mountain Repository, university of Nevada, Reno: 2/2009 Hossein Jalali Thesis., Split set stabilizerIntemet2014 KHCNM SO 8/2014* CNKT HAM LO ... cdch hieu qua la kit hgp neo ong hd vdi be tdng tryang nd thi cdng neo Cdn ggi Id neo be tdng-dng hd (Concrete- Split set bolt) Nguyen tac cija phwang phap nhw sau: Thanh neo Ing dygc c h i tao... 4.400.190,75 d/m IV K i t luan Neo be tdng - Ing hd (Concrete- Split set bolt) Id loai neo mang tai tdc thdi sau lap dat neo, I n dmh v l tai trgng, b i n vdng mdi Neo Ing hd mdi chi dygc ching... dang 16 xo, ddu neo dang thoi, dygc nen chat lai qua trinh lap dat vdo Id neo Cho bua khoan dap vdo chuoi d i n hydng (hinh 7) vdi t i c chdm, nhg nhdng ddy dng neo vao 16 neo Khi neo da dat dung