Udonga lwemfumba ye-secant luhlobo lwemfumba ebiyelweyo yomgodi wesiseko. Ingqumba yekhonkrithi eyomeleziweyo kunye nengqumba yekhonkrithi ecacileyo iyasikwa kwaye ivalwe, kwaye iiPiles zilungiselelwe ukwenza udonga lweemfumba ezidibeneyo. Amandla okucheba anokudluliselwa phakathi kwengqumba kunye nengqumba ukuya kumlinganiselo othile, kwaye ngelixa ugcina umhlaba, unokudlala indima ngokufanelekileyo yokumisa amanzi, kwaye ilungele ukusetyenziswa kwiindawo ezinomgangatho ophezulu wamanzi aphantsi komhlaba kunye nesiza esimxinwa.
Uyilo lwe-secant pile eludongeni
Ngokwethiyori, ngenxa yokuba imfumba yekhonkrithi ekufuphi ethafeni kunye neyomeleziweyo yengqumba yekhonkrithi idityanisiwe ukwenza udonga, imfumba yekhonkrithi ethafeni kunye nengqumba yekhonkrithi eyomeleziweyo idlala isiphumo esidibeneyo xa udonga lwemfumba lugxininisekile kwaye lukhubazekile. Kwimfumba yekhonkrithi eyomeleziweyo, ubukho bengqumba yekhonkrithi ecacileyo kwandisa ukuqina kwayo okuguquguqukayo, okunokuthi kuqwalaselwe ngendlela yokuqina elinganayo ekubaleni xa kunamava.
Nangona kunjalo, uphononongo lweprojekthi ebonakalayo lubonisa ukuba izinga legalelo ekuqineni kwemfumba yekhonkrithi ecacileyo imalunga ne-15% kuphela ngokubonakala kweentanda emazantsi okomba. Ngoko ke, xa umzuzu wokugoba ukhulu, ukuqina kwemfumba yekhonkrithi ecacileyo akunakuqwalaselwa; Xa umzuzu wokugoba uncinci, igalelo lokuqina kwengqungquthela yekhonkrithi ecacileyo inokuqwalaselwa ngokufanelekileyo xa ubala i-deformation yomqolo wemfumba, kunye nokuqina komgqomo wekhonkrithi oqinisiweyo unokuphindwa ngokuphindaphindwa kwe-coefficient yokuphucula ukuqina kwe-1.1 ~ 1.2.
Ukwakhiwa kodonga lwe-secant pile
Imfumba ethafeni iphoswe ngekonkrithi enqabileyo kakhulu kwangaphambili. I-concrete enqumlayo inxalenye yemfumba yekhonkrithi edibeneyo ethafeni iyasikwa yikhono lokusika le-casing drill ngaphambi kokusekwa kokuqala kweemfumba zekhonkrithi ezicacileyo, kwaye ke iimfumba zenyama zigalelwa ukuqonda ukuvalelwa kweemfumba ezikufutshane.
Inkqubo yolwakhiwo lwe-single secant pile wall ilandelayo:
(a) Ukugrunjwa komlindi kwindawo: Xa udonga lwesikhokelo sokumisa lunamandla awoneleyo, sebenzisa ikhreyini ukuhambisa i-drill endaweni, kwaye wenze umbindi wesibambi sombhobho esingundoqo kumbindi womngxuma wodonga lwesikhokelo.
(b) Ukwenziwa kwengqumba enye: Ngokucofa icandelo lokuqala lesilinda sokhuselo (ubunzulu be-1.5m ~ 2.5m), i-emele ye-arc ithatha umhlaba kwi-cylinder yokukhusela, iwubambe umhlaba ngelixa uqhubeka ucinezela kude kube kokokuqala. icandelo licinezelwe ngokupheleleyo ngaphakathi (ngokubanzi ukushiya i-1m ~ 2m emhlabeni ukuze kube lula ukudityaniswa kwe-cylinder) ukubona ukuthe tye. Emva kokuphumelela uvavanyo, i-cylinder yesibini yokukhusela idibaniswe, kwaye ngoko ke kumjikelezo de uxinzelelo lufikelele kwi-design pile down elevation.
(c) Ukuphakamisa i-cage yensimbi: Kwi-pile B, i-cage yokuqinisa kufuneka ibekwe emva kokuba ukuhlolwa komngxuma kufanelekile. Ngeli xesha, ukuphakama kwe-cage yokuqinisa kufuneka kube kuchanekile.
(d) Isitofu sekhonkrithi: Ukuba kukho amanzi emngxunyeni, kuyafuneka ukuba kusetyenziswe indlela yesitofu sangaphantsi kwamanzi; Ukuba akukho manzi emngxunyeni, sebenzisa indlela yokucoca umngxuma owomileyo kwaye ubeke ingqalelo kwi-vibration.
(e) Igubhu yokutsala kwimfumba: ngelixa ugalela ikhonkrithi, khupha i-cylinder yokukhusela, kwaye ubeke ingqalelo ekugcineni i-bottom ye-drum yokukhusela ≥2.5m ngaphantsi kwendawo yekhonkrithi.
Inkqubo yokwakha umqolo wengqumba ngolu hlobo lulandelayo:
Kuluhlu lweemfumba ezivalayo, inkqubo yokwakha ngu-A1→A2→B1→A3→B2→A4→B3, njalo njalo.
Iimpawu eziphambili zekhonkrithi:
Ukumiselwa kwexesha lokucuthwa kwengqumba yekhonkrithi kufuneka kubalwe ixesha lokucuthwa kwengqumba A ngokwendlela elandelayo emva kokumisela ixesha elifunekayo kwimfumba enye yeemfumba A no-B:
T=3t+K
Ifomula: K - ixesha logcino, ngokubanzi 1.5t.
Kwinkqubo yokwenziwa komngxuma wengqumba B, ngenxa yokuba ikhonkrithi yengqumba A ayiqiniswanga ngokupheleleyo kwaye isekwimo equkuqelayo, inokugxalathelana ukuya kumngxuma wengqumba B ukusuka ekudibaneni kwengqumba A kunye nengqumba B, yenze “ ukugcwala kwemibhobho”. Amanyathelo awoyisayo ngala:
(a) Lawula ukudilika kwesamente kwingqumba A ＜14cm.
(b) Isingxobo siyakufakwa ubuncinane nge-1.5m ngaphantsi komngxuma.
(c) Jonga ukuba umphezulu wesamente wengqumba A uyatshona ngexesha lokwenyani. Ukuba kufunyenwe ukuthomalalisa, ukugrunjwa kwengqumba B kufuneka kunqunyanyiswe ngoko nangoko kwaye ngelixa ucinezela isilinda sokhuselo kangangoko kunokwenzeka, gcwalisa umhlaba okanye amanzi kwingqumba B (bhalansi uxinzelelo lwekhonkrithi lwengqumba A) de “umbhobho ovuthuzayo” uphele. wayeka.
Eminye imilinganiselo:
Xa udibana nemiqobo ephantsi komhlaba, ngenxa yokuba udonga lwemfumba ye-secant luthatha i-casing yensimbi, umqhubi unokuwuphakamisa umngxuma ukususa imiqobo xa kumiselwe ukuba indalo ikhuselekile,.
Kuyenzeka ukuba uthathe ikheji yentsimbi ebekiweyo xa ukhupha ingqumba yengxowa ukuya phezulu. Amanyathelo othintelo anokukhethwa ukunciphisa ubungakanani bamasuntswana eaggregate yekhonkrithi yeposi B okanye ipleyiti yentsimbi ebhityileyo incinci kancinci kunoko inokudityaniswa ukuya ezantsi kwekheji yentsimbi ukunyusa isakhono sayo sokuchasa ukudada.
Ngexesha lokwakhiwa kodonga lwemfumba ye-secant, asifanele sicinge kuphela ngokucotha ixesha lokucwangcisa ulawulo lwemfumba yekhonkrithi ethafeni, sinikele ingqalelo kulungiselelo lwexesha lokwakhiwa kwekhonkrithi ethafeni ekufutshane kunye nemfumba yekhonkrithi eyomeleziweyo, kodwa nokulawula inqanaba elithe nkqo ingqumba, ukuze kuthintelwe imfumba yekhonkrithi eyomeleziweyo ekubeni ingakwazi ukwakhiwa ngenxa yokukhula okugqithisileyo kwamandla engqumba yekhonkrithi. Okanye ngenxa yokuba imfumba yekhonkrithi egqityiweyo ecacileyo perpendicularity itenxa inkulu, ibangele imeko yesiphumo esibi sokudibanisa kunye nemfumba yekhonkrithi eyomeleziweyo, nkqu ukuvuza komngxuma wesiseko, akakwazi ukumisa amanzi kunye nokusilela. Ngoko ke, kufuneka kwenziwe amalungiselelo afanelekileyo okwakhiwa kodonga lwemfumba efihlakeleyo, yaye kufuneka kwenziwe iirekhodi zokwakha ukuze kube lula ukwakhiwa ngokutyibilikayo. Ukuze kulawulwe ukuchaneka kokwenza umngxuma wemfumba evalekileyo ukuhlangabezana neemfuno zoyilo kunye neenkcukacha ezinxulumeneyo, yonke inkqubo yolawulo lokuchaneka kokwenza umngxuma kufuneka yamkelwe. Iikholamu ezimbini zomgca zingaxhonywa kumatshini wokwenza imfumba ukulawula i-perpendicularity yodonga lwangaphandle lomzantsi-mntla kunye nempuma-ntshona yokukhusela i-cylinder kunye ne-clinometer emibini ingasetyenziselwa ukujonga i-perpendicularity yomngxuma. Ukulungiswa kunye nokulungelelaniswa kufuneka kwenziwe ngexesha xa ukutenxa kufunyenwe.
Ngokufana nokwakhiwa kodonga oluphantsi komhlaba oluqhubekayo, ukwakhiwa kodonga lwemfumba ye-casing ngokupheleleyo, kuyafuneka ukuba wenze udonga lwesikhokelo phambi kokugrumba kwimfumba, ethe yanelisa ulawulo lwendawo yendiza yemfumba egrunjiweyo kwaye yasebenza njengemfumba. iqonga koomatshini bokwakha ukunqanda ukudilika komngxuma, qinisekisa ukuba ingqumba yodonga lwemfumba eyomileyo ime nkqo, kwaye uqinisekise ukusebenza ngokutyibilikayo kwe-drill ye-casing drill. Iimfuno zokwakha zodonga lwesikhokelo zingabonwa kwiimfuno ezifanelekileyo zodonga oluphantsi komhlaba lwe-diaphragm.
Ixesha lokuposa: Nov-17-2023