'Nete Mabapi le Lithaelese tsa Mehaho ea Mehaho bakeng sa Lithako tsa Concrete Tunnel: Hobaneng ha tšepe e se ka linako tsohle e le Karabo

Khaotsa ho Tšoara Tunnel ea hau joalo ka Borokho ba Borokho

Ha re tobeng: haeba u ntse u totobatsa likhoele tsa tšepe kapa letlooeng la terata e tšetsoeng bakeng sa kotopo e 'ngoe le e 'ngoe e sa tloaelehang, u ka 'na ua iketsetsa bothata ka ho feteletseng le ho hlahisa hlooho e bohloko ea nako e telele. Papali e bohlale ho feta ea lithanele tse ngata tsa sejoale-joale, haholo-holo tse metsing a ka tlas'a lefatše a mabifi, mongobo o phahameng, kapa ho pepesehela lik'hemik'hale-ke likhoele tsa sebopeho sa lithanele tsa konkreite. Re qetile lilemo tse mashome re shebelletse merero e hloleha eseng hobane konkreite e robehile, empa hobane tshepe e ile ya shwa. Re mona ho bua: ke nako ea ho fetola monahano oa hau oa khale.

Sena ha se taba ea ho tlohela matla. E mabapi le ho hlalosa bocha se boleloang ke matlafatso tikolohong ea kotopo. Re hloka tsamaiso e loantšang mapetsong a ho honyela, e monya matla a mafika a phatlohileng, mme o ntse a ema ha mollo o qhoma. Tšepe e ke ke ea etsa tsena tse tharo ntle le likhohlano tse kholo. Synthetics e ka khona.

1. Tlhahlobo ea 'Nete ea Boitsebiso: Polypropylene, PVA, le Aramide

Ha se likhoele tsohle tsa maiketsetso tse entsoeng li lekana. Ha re bua ka likhoele tsa sebopeho sa lithanele tsa konkreite, ha re bue ka li-micro-fibers tse sa hlakang tse sebelisoang ho laola ho putlama ha polasetiki ka letlapa le phahameng.. Re bua ka macro-fibers-hangata 40 mm ho 60 mm ka bolelele-e entsoeng ho tloha polypropylene e phahameng ea tenacity, motsoako oa polyolefin, PVA (joala ba polyvinyl), kapa, maemong a feteletseng, aramid.

1.1. Polypropylene le Polyolefin: The Workhorses

Tsena ke tse atileng haholo. Hobaneng? Ha li na lik'hemik'hale, ha ba ruse, 'me li fana ka toughness e babatsehang bakeng sa litšenyehelo. Ka metsi-motsoako oa shotcrete, ba pompa joalo ka toro ha ba nolofalitsoe hantle. Re bone linings moo rakonteraka a ileng a tloha ho tšepe ho ea ho polyolefin macro-fiber e sebetsang hantle haholo., 'me molemo oa hang-hang e ne e le ho fokotseha ha tšepe ea tšepe e tlase hangata e otla 15-20%, empa li-synthetics li theola seo tlase 5%. Seo ha se chelete e nyane; ke phokotso e kholo ea litšila tsa lintho tse bonahalang le mosebetsi oa ho hloekisa.

1.2. Lisebelisoa tsa PVA: Ha Bond e le Tsohle

Likhoele tsa PVA li na le kamano ea tlhaho bakeng sa samente. Ba tlamahane ka lik'hemik'hale. Sena se ba fa monyetla oa ho etsa lilakane tse tšesaane kapa litokisong moo u hlokang taolo e ikhethang ea crack libakeng tse thata haholo.. Leha ho le joalo, li theko e boima haholo 'me ho ka ba thata ho li hasanya ka ho lekana. Re li khothaletsa hafeela maemo a geotechnical a hloka ho kenella ho tlase haholo le ho tiea ho hoholo ha maemo karolong e tšesaane..

1.3. Aramid: Mabotho a Khethehileng

Bakeng sa libaka tse sisinyehang kapa lithanele tse tlas'a tšusumetso ea mafika a oelang fatše, likhoele tsa aramid li fana ka matla a ho monya matla a qothisanang lehlokoa le tšepe. Li theko e boima, empa haeba moralo oa hau o hloka matla a setseng ka mor'a ho phatloha hoo ho seng ntho e 'ngoe ea maiketsetso e ka amang, aramid ke karabo. E sebedise ka hloko.

2. Corrosion Ke 'Molai ea Khutsitseng. Li-Fiber tsa tšepe li tsoa Mali.

Re butse lithanele tsa lilemo tse leshome tse matlafalitsoeng ka likhoele tsa tšepe. Re bone mafome a silafatsa. Re lekanyelitse tahlehelo ea likarolo tse fapaneng ka har'a likhoele tse haufi le bokaholimo. Sebakeng sa kotopo, ho na le mongobo, hangata li-chloride tse tsoang letsoai la de-icing le tsamaisoang ke sephethephethe, 'me ka linako tse ling sulfate mobung. Mafome a tšepe a rusa. Ha di rusa, lia atoloha. Katoloso eo e hlahisa khatello ea maikutlo ka har'a konkreite e bakang ho phatloha holimo.

Ka likhoele tsa sebopeho sa lithanele tsa konkreite, kotsi ena ea nyamela. Zero. Zilch. Fiber ha e sebetse. Konkreite e lula e hloekile. Bakeng sa kotopo e lebelletsoeng ho tšoarella 100+ lilemo, monyetla ona o le mong o lokela ho khanna qeto bakeng sa lesela lefe kapa lefe sebakeng se senyang. Ha re nahane. Ena ke mahlale a thepa ea mantlha.

3. Ts'ebetso ea Mechini: Thata Ho Feta Matla

Re hloka ho emisa ho nahana ka matla a hatellang mme re qale ho batla ho tiea ha maemo. Lesela la kotopo ke khetla. E kobehile. E ea holofatsa. E hloka ho monya matla ntle le ho hloleha ka mokhoa o kotsi. Metric ea bohlokoa ke matla a setseng - na khoele e ka tšoara sekhahla hammoho ka mor'a khefu ea konkreite?

Likhoele tsa tšepe li fana ka matla a babatsehang ka mor'a ho phunyeha, empa li boima ebile li thata. Ka kopo ea shotcrete, ba etsa hore thepa e be thata ho pompa le ho eketsa ho senyeha ha lisebelisoa. Likhoele tsa maiketsetso tsa sebopeho li fana ka mokhoa oa ho hloleha ho feta oa ductile. Ha konkreite e petsoha, likhoele tsa maiketsetso lia otloloha, ho monya matla. Ha ba qhekelle. Ha li hlahise khatello e matla ea khatello ntlheng ea ho phatloha. Re na le lintlha tse tsoang litekong tse ngata tsa phanele (ASTM C1550 kapa EN 14651) ho bontša hore motsoako o entsoeng hantle oa fiber o ka tsamaisana le ho monya matla ha tšepe ka tekanyo e tlase haholo ka boima ba 'mele..

4. Tshebetso ea Mollo: The Spalling Nightmare

Haeba ha u e-so bone kotopo e lutseng ka mor'a mollo o matla, o hloka ho utloisisa sena: li-spall tsa konkreite tse phatlohang ha li futhumatsoa ka potlako. Khatello ea mouoane e eketseha ka har'a konkreite, 'me li-slabs tsa lesela li foka, ho pepesa matlafatso. Ka likhoele tsa tšepe, seo ke tlokotsi. Tšepe ea chesa, felloa ke matla, mme sebopeho se sekiselitsoe.

Likhoele tsa maiketsetso tsa sebopeho, haholo-holo polypropylene micro-fibers tse sebelisoang hammoho le macro-fibers, qhibiliha hoo e ka bang 160 ° C (320°F). Sena se theha marang-rang a likanale tse nyane ka har'a konkreite. Ha mollo o otla, polypropylene e qhibiliha, ho siea masoba a etsang hore mouoane o tsoe. Lesela ha le chese. Ke kahoo likhoutu tse kang NFPA 502 bakeng sa likotopo tsa litsela hona joale li lemoha molemo oa likhoele tsa polypropylene bakeng sa ho hanyetsa mollo. Ha re matlafatse feela khahlanong le loading; re haha ​​ka valve ea tšireletso.

5. Moqapi oa Motsoako: Ho lumellana ha se Taba ea Boikhethelo

Ho kenyelletsa likhoele ho motsoako oa lesela la kotopo ha se ntho e bonolo ea ho lahla le ho sebetsa. Likhoele li qothisana lehlokoa le molumo oa peista. Li ama bokhoni ba ho sebetsa. Li sebelisana le metsoako. Mohlala, haeba u sebelisa tekanyo e phahameng ea accelerator ho shotcrete bakeng sa botenya ba ho haha ​​​​ka potlako, o tlameha ho fetola tekanyetso ea hau ea ho fokotsa metsi. Lithaele tsa maiketsetso tsa sebopeho li hloka kakaretso e hlophisitsoeng hantle le sekontiri se phahameng ho netefatsa hore li koaheloa hantle..

Kamehla re eletsa ho tsamaisa phanele ea ho soma pele ho tšollela ka sehloohong. Sheba kabo ea fiber. Na ba ntse ba phutha? Na li qhalakane ka ho lekana? Khaola phanele e thata 'me u shebe. Tšepa, empa netefatsa. Konkreite ea fiber e sa tsoakoang e mpe ho feta konkreite e se nang fiber hobane u nka hore e na le bokhoni boo e se nang eona.

6. Melao ea Taolo: Seo Ha e le Hantle U Lokelang ho se Latela

Litekanyetso tsa khauta tsa indasteri ena li ASTM C1550 (teko e pota-potileng determinate panel bakeng sa toughness flexural) le IN 14889-2 (likhoele bakeng sa konkreite – likhoele tsa maiketsetso). Bakeng sa shotcrete, ACI 506 litataiso li koahela li-shotcrete tse matlafalitsoeng ka fiber. Se ke oa amohela likopo tsa moetsi oa fiber ntle le tlaleho ea tlhahlobo ea mokha oa boraro e fihlelang litekanyetso tsena. Re bone barekisi ba batla matla a phahameng ka fiber e sa ts'oereng 1.0 MPa ea matla a setseng. Seo ha se sebopeho. Eo ke taolo ea ho honyeha ea polasetiki.

Bakeng sa lithanele, batla bonyane sehlopha sa matla a setseng (mohlala, 2.0 MPa kapa 3.0 MPa ha ho buloa molomo oa crack). Linomoro li bohlokoa.

7. Litšenyehelo tsa Potoloho ea Bophelo: The Real Financial Argument

Ee, structural synthetic fibers cost more per pound than steel fibers. Ee, the upfront material cost is sometimes higher. But stop. Look at the total project cost.

• Rebound loss: Synthetic fibers lose 5% in shotcrete; steel loses up to 20%. That is a direct savings on material.
• Wear and tear: Synthetic fibers do not abrade pumps and hoses. Steel fibers wear out equipment faster.
• No corrosion protection needed: No need for thicker cover. No need for protective coatings. The fiber itself is the protection.
• Fire safety: If you use synthetics, you may be able to reduce or eliminate the need for a separate fire protection layer (like passive fireproofing tiles). That saves millions on a long tunnel.

Run the numbers for a 50-year maintenance horizon. Steel linings often require repairs at 20-30 years due to corrosion spalling. Li-synthetic linings, sebakeng se se nang chloride, e ka tšoarella habonolo bophelo ba moralo ntle le ho kenella. Eo ke chelete ea sebele ea ho boloka chelete.

Keletso ea Rōna e Matla: Leka Pele U Itlama

Re u file logic. Re u file lipapiso. Jwale, re u khothalletsa hore u nke khato. Se ke oa qeta ho bala sena ebe u nka hore tharollo e le 'ngoe e lumellana le tsohle.

Ikopanye le sehlopha sa rona sa tekheniki kajeno bakeng sa lipuisano tsa mahala tsa moralo oa motsoako. Re tla sekaseka maemo a geotechnical a projeke ea hau, litlhoko tsa tekanyo ea mollo, le mokhoa oa ho haha. Re tla u thusa ho khetha se nepahetseng likhoele tsa sebopeho sa lithanele tsa konkreite le ho u fa tekanyo, mokhoa oa ho kopanya, le protocol ea liteko ho netefatsa ts'ebetso.

Khaotsa ho hakanya. Qala boenjiniere ka fiber e nepahetseng. Tobetsa mona ho hlophisa lipuisano tsa hau.

Mofani
ConcreteAndMore ke morekisi ea tšepahalang oa lefats'e ka bophara oa metsoako ea konkreite e sebetsang hantle haholo le lik'hemik'hale tsa kaho.. Ka lilemo tsa botsebi ba indasteri, Re sebetsa ka thata ho fana ka litharollo tse ncha tse kenyelletsang li-superplasticizers tsa polycarboxylate, likhoele tsa konkreite, defoamers, ho phophomang malwetse, le lihlahisoa tse tsoetseng pele tsa airgel thermal insulation. Haeba u thahasella motsoako oa konkreite, ka kopo ikutloe u lokolohile ho ikopanya le rona!