I-secant pile wall iwuhlobo lwenqwaba ebiyelwe yomgodi wesisekelo. Inqwaba kakhonkolo eqinisiwe kanye nenqwaba kakhonkolo engenalutho iyasikwa futhi ivalwe, futhi ama-Piles ahlelwe ukuze akhe udonga lwezinqwaba ezihlanganayo. I-shear force ingadluliswa phakathi kwenqwaba nenqwaba ngezinga elithile, futhi ngenkathi igcina umhlaba, ingadlala ngempumelelo indima yokumisa amanzi, futhi ifaneleka ukusetshenziswa ezindaweni ezinezinga eliphezulu lamanzi angaphansi komhlaba kanye nendawo encane.
Umklamo we-secant pile wall
Ngombono, ngenxa yokuthi inqwaba kakhonkolo eseduze kanye nenqwaba kakhonkolo eqinisiwe ukuze kwakhiwe udonga, inqwaba kakhonkolo ethafeni kanye nenqwaba kakhonkolo eqinisiwe idlala umphumela ohlangene lapho udonga lwenqwaba lugcizelelwa futhi lukhubazekile. Ngenqwaba kakhonkolo eqinisiwe, ukuba khona kwenqwaba kakhonkolo ongenalutho kwandisa ukuqina kwayo okugobekayo, okungabhekwa ngendlela yokuqina elinganayo ekubaleni lapho isipiliyoni.
Kodwa-ke, ucwaningo lwephrojekthi esebenzayo lubonisa ukuthi izinga lomnikelo ekuqineni kwenqwaba kakhonkolo ongenalutho lilinganiselwa ku-15% kuphela ngokubonakala kwemifantu phansi kokumba. Ngakho-ke, lapho umzuzu wokugoba mkhulu, ukuqina kwenqwaba yekhonkrithi ethafeni akukwazi ukucatshangelwa; Lapho isikhathi sokugoba sisincane, umnikelo wokuqina wenqwaba kakhonkolo ongenalutho ungacatshangelwa kahle lapho kubalwa ukuguqulwa komugqa wenqwaba, futhi ukuqina kwenqwaba kakhonkolo okuqinisiwe kungaphindaphindwa nge-coefficient yokuthuthukisa ukuqina kwe-1.1 ~ 1.2.
Ukwakhiwa kwe-secant pile wall
Inqwaba ethafeni iphonswa ngokhonkolo ophelelwe yisikhathi kusengaphambili. Ingxenye yekhonkrithi ephambanayo yezinqwaba zikakhonkolo eziseduze inqunywa ikhono lokusika le-casing drill ngaphambi kokumiswa kokuqala kwezinqwaba zikakhonkolo ezingenalutho, bese kuthi izinqwaba zenyama zithululwe ukuze zibone ukuvaleka kwezinqwaba eziseduze.
Inqubo yokwakhiwa kwe-single secant pile wall imi kanje:
(a) Umshini wokubhoboza unogada endaweni: Uma udonga lwenkomba yokuma lunamandla anele, sebenzisa ikhreyini ukuze uhambise i-drill endaweni, futhi wenze indawo ephakathi nendawo yesibambi sepayipi eliyinhloko phakathi nendawo yembobo yodonga lomhlahlandlela.
(b) Ukwakheka kwembobo yenqwaba eyodwa: Ngokucindezelwa kwengxenye yokuqala yesilinda sokuvikela (ukujula kuka-1.5m ~ 2.5m), ibhakede le-arc lithatha inhlabathi kusilinda esivikelayo, libambe inhlabathi ngenkathi liqhubeka licindezela phansi kuze kube elokuqala. ingxenye icindezelwe ngokugcwele (imvamisa ishiya u-1m ~ 2m phansi ukuze kube lula ukuxhumana kwesilinda) ukuze kutholwe ukuma kwayo. Ngemva kokudlula ukuhlolwa, isilinda sokuzivikela sesibili sixhunyiwe, kanjalo nomjikelezo kuze kube yilapho ingcindezi ifinyelela ekuphakameni okuphansi kwenqwaba.
(c) Ukuphakamisa ikheji yensimbi: Ngenqwaba B, ikheji yokuqinisa kufanele ibekwe ngemuva kokuhlolwa kwembobo. Ngalesi sikhathi, ukuphakama kwekheji lokuqinisa kufanele kube okuqondile.
(d) umjovo kakhonkolo: Uma kukhona amanzi embobeni, kubalulekile ukusebenzisa indlela yokujova ukhonkolo ngaphansi kwamanzi; Uma kungekho manzi emgodini, sebenzisa indlela yokufaka imbobo eyomile futhi unake ukudlidliza.
(e) Isigubhu sidonsa sibe yinqwaba: ngenkathi uthela ukhonkolo, khipha isilinda sokuvikela, futhi unake ukugcina okungaphansi kwesigubhu sokuvikela ≥2.5m ngaphansi kwendawo kakhonkolo.
Inqubo yokwakha imigqa yenqwaba imi kanje:
Ngomugqa wokuvala izinqwaba, inqubo yokwakha ithi A1→A2→B1→A3→B2→A4→B3, njalonjalo.
Izinkomba ezibalulekile zikakhonkolo:
Ukunqunywa kwesikhathi sokuhlehliswa kukakhonkolo senqwaba A kudinga ukubala isikhathi sokuvinjwa kukakhonkolo senqwaba A ngokwale fomula elandelayo ngemva kokunquma isikhathi esingu-t esidingekayo ekubunjweni kwenqwaba eyodwa yenqwaba A no-B:
T=3t+K
Ifomula: K - gcina isikhathi, ngokuvamile 1.5t.
Enqubweni yokwakhiwa kwemigodi yenqwaba B, ngenxa yokuthi ukhonkolo wenqwaba A awuqini ngokuphelele futhi usesesimweni esigelezayo, ungase ugijimele embotsheni yenqwaba B usuka empambanweni yenqwaba A kanye nenqwaba B, yakhe “ ukuqhuma kwamapayipi”. Izinyathelo zokunqoba yilezi:
(a) Lawula ukuwa kukakhonkolo kwenqwaba A ＜14cm.
(b) Ibhokisi kufanele lifakwe okungenani libe yi-1.5m ngaphansi komgodi.
(c) Bheka ukuthi indawo engaphezulu kukakhonkolo yenqwaba A iyacwila yini ngesikhathi sangempela. Uma kutholakala indawo encane, ukumbiwa kwenqwaba B kufanele kumiswe ngokushesha futhi ngenkathi ucindezela phansi isilinda sokuvikela ngangokunokwenzeka, gcwalisa inhlabathi noma amanzi enqwabeni B (bhalansi ukucindezela kukakhonkolo kwenqwaba A) kuze kube “ukuqhuma kwepayipi” wema.
Ezinye izinyathelo:
Lapho uhlangabezana nezithiyo ezingaphansi komhlaba, ngoba udonga lwenqwaba ye-secant luthatha i-casing yensimbi, opharetha angakwazi ukuphakamisa umgodi ukuze asuse izithiyo lapho kunqunywa ukuthi imvelo iphephile,.
Kungenzeka ukuthatha ikheji yensimbi ebekiwe lapho ukhipha inqwaba yekheji phezulu. Izinyathelo zokuvimbela zingakhethwa ukuze kuncishiswe usayizi wezinhlayiyana zenhlanganisela kakhonkolo yeposi B noma ipuleti lensimbi elincanyana elincane kunalo lingashiselelwa phansi kwekheji yensimbi ukuze kwandiswe ikhono layo lokunqanda ukuntanta.
Ngesikhathi sokwakhiwa kodonga lwenqwaba ye-secant, akufanele nje sicabangele ukulawula isikhathi sokusetha kancane kwenqwaba kakhonkolo, sinake ukuhlelwa kwesikhathi sokwakhiwa kokhonkolo oseduze kanye nenqwaba kakhonkolo eqinisiwe, kodwa futhi silawule izinga eliqondile inqwaba, ukuze kuvinjwe inqwaba kakhonkolo eqinisiwe ukuthi ingakwazi ukwakhiwa ngenxa yokukhula ngokweqile kwamandla enqwaba kakhonkolo. Noma ngenxa yokuthi ukuchezuka kwenqwaba kakhonkolo kuqediwe kukhulu, okubangela isimo somphumela ongemuhle wokubopha ngenqwaba kakhonkolo eqinisiwe, ngisho nokuvuza komgodi wesisekelo, akukwazi ukumisa amanzi nokwehluleka. Ngakho-ke, kufanele kwenziwe amalungiselelo anengqondo okwakhiwa kodonga lwenqwaba ye-secant, futhi amarekhodi okwakha kufanele enziwe ukuze kube lula ukwakhiwa okubushelelezi. Ukuze kulawulwe ukunemba kokwakhiwa kwembobo yenqwaba evalekile ukuze kuhlangatshezwane nezidingo zomklamo kanye nokucaciswa okuhlobene, yonke inqubo yokulawula ukunemba kokwakhiwa kwemigodi kufanele yamukelwe. Amakholomu emigqa emibili angalengiswa emshinini wokwakha inqwaba ukuze kulawulwe i-perpendicularity yodonga lwangaphandle lwesilinda sokuvikela esiseningizimu-enyakatho nasempumalanga-ntshonalanga kanye ne-clinometer emibili ingasetshenziswa ukuhlola i-perpendicularity yembobo. Ukulungiswa nokulungiswa kufanele kwenziwe ngesikhathi lapho ukuchezuka kutholakala.
Ngokufana nokwakhiwa kodonga oluqhubekayo olungaphansi komhlaba, ukuze kwakhiwe udonga lwenqwaba ye-secant ngokugcwele, kuyadingeka futhi ukwenza udonga oluqondisayo ngaphambi kokubhoboza lube yinqwaba, oluye lwanelisa ukulawulwa kwendawo yendiza yenqwaba e-drilled occlusive futhi yasebenza njenge inkundla yemishini yokwakha ukuze kuvinjwe ukubhidlika kwembobo, qinisekisa ukuthi inqwaba yodonga lwenqwaba imile, futhi uqinisekise ukusebenza kahle kwe-drill ye-casing drill. Izidingo zokwakha zodonga oluqondisayo zingabonakala ezidingweni ezifanele zodonga olungaphansi komhlaba lwe-diaphragm.
Isikhathi sokuthumela: Nov-17-2023