Ukulinganisa Kabusha nge-Chainage: Ukukhokhelwa Komsebenzi

Emgwaqweni namkha epayiphini, awukhokhelwa amanani asebhilini. Ukhokhelwa amanani ongafakazela bona uwakhile. Iinsivumelwano ezinengi zobunjiniyela bomphakathi eSewula Afrika ziyalinganiswa kabusha. Ibhili yamanani (i-BOQ) ilinganisela umsebenzi kwaphela. Lokho okufika esitifiketini sakho sokukhokhwa kulokho okulinganiswe esayidini, ingcenye ngengcenye, ngokulandela i-chainage.

Ikhomba-ndlela le ihlathulula indlela ukulinganisa kabusha nge-chainage okusebenza ngayo eenvumelwaneni zobunjiniyela bomphakathi. Ihlanganisa bona yini isivumelwano sokulinganisa kabusha, indlela i-chainage esebenza ngayo, ngubani olinganisako ngaphasi kwe-GCC 2015, indlela izinto zobude nezevolumu ezilinganiswa ngayo, nendlela amanani alinganisiweko angena ngayo esitifiketini. Ibhalelwe abalinganisi bamanani (ii-QS), abameli besayidi neemenenja zeenvumelwano. Ikhomba-ndlela esebenzako, akusosiluleko sezomthetho. Isivumelwano sakho, iinchazelo zaso nezethulo ze-BOQ zihlala ziza kuqala.

Yini Ukulinganisa Kabusha Esivumelwaneni Sobunjiniyela Bomphakathi?

Ukulinganisa kabusha kutjho bona amanani we-BOQ ngamanani alinganiselwako, begodu ukhokhelwa amanani alinganiswe kwamambala ngamanani owafake ethendeni. I-GCC 2015 ihlathulula i-Re-measurement Contract begodu, esigabeni 6.7.1, ithi amanani we-BOQ yayo ngamanani alinganiselwako womsebenzi. Amanani wakho wentengo ayaqina. Amanani womsebenzi awaqinanga.

Lokhu kufanele umsebenzi wobunjiniyela bomphakathi, lapho kungekho namunye owazi ivolumu eqondileko yelitje, ubude bokugcina bomsele namkha ubude bamambala bepayiphi kufikela umsebenzi uphele. Iklayenti lithwala ingozi yamanani womsebenzi. Umthekeli uthwala ingozi yamanani wentengo.

Ngaphasi kweenvumelwano ze-NEC, umbono ofanako uvela kuma-Option amakhulu asebenzisa ibhili yamanani, njenge-Option B. Amagama neendlela ziyahluka, kodwana isisekelo siyafana: intengo ngeyunithi, ukukhokha ngamanani alinganisiweko.

Ukulinganisa kabusha kuguqula nendlela iinthenda ezihlolwa ngayo. I-SAICE ku-GCC 2015 corrections and FAQ ithi, esivumelwaneni sokulinganisa kabusha, iimphosiso zokubala emgqeni wento zilungiswa ngokugcina intengo yeyunithi efakwe ethendeni begodu kulungiswe isamba somgqa. Amanani wakho wentengo asisivumelwano. Wenze alunge.

Yini I-Chainage?

I-chainage libanga elisemgqeni wokulawula oqinileko ukusuka endaweni yokuthoma, elisetjenziswa ukutjengisa lapho umsebenzi ukhona emigwaqweni, emapayiphini, emiseleni yamanzi nemizileni yeentimela. Ngokuvamileko ibhalwa njengamakhilomitha kunye namamitha. Ngalokho i-chainage 12+340 itjho amakhilomitha ali-12 namamitha ama-340, namkha i-12,340 m, ukusuka ekuthomeni komugqa. Ama-offset ngesincele namkha ngesidla somugqa atjengisa umsebenzi ngaphesheya kwawo.

I-chainage likheli lemvelo lomsebenzi wobude. Ifulo namkha umugqa wegridi kuyasebenza esakhiweni. Ipayiphi yamanzi amakhulu ye-9 km idinga ireferensi eyodwa ehlanganyelwa yimidwebo, ukubekwa komsebenzi, ukulinganisa nesitifiketi.

Amagama amathathu ozawahlangana nawo:

Umugqa wokulawula namkha umugqa wephakathi: umugqa i-chainage elinganiswa ngawo, obekwe ngokuya ngomklamo.
Ingcenye: ubude bomsebenzi phakathi kwee-chainage ezimbili, obuvamise ukusetjenziselwa ukulinganisa, ukunikela namkha ihlelo.
I-chainage equation: indawo lapho i-chainage yomklamo yeqa khona, isibonelo ngemva kokulungiswa kabutjha komugqa. Yibhale ephepheni ngalinye lokulinganisa, ngaphandle kwalokho uzakulinganisa ubude kabili namkha ungabulinganisi nakancani.

Ngubani Olinganisa Umsebenzi Ngaphasi Kwe-GCC 2015?

Ngaphasi kwe-GCC 2015, i-Employer’s Agent ibeka ivelu elinganisiweko yomsebenzi, begodu umthekeli ulinganisa bese afaka isitatimende esisekelako lokha i-Employer’s Agent icela. Isigaba 6.7 sibeka lokhu. I-Employer’s Agent inikela isaziso ngaphambi kokulinganisa, begodu kufuze ube khona namkha uthumele umeli ofanelekileko azokuhlanganyela.

Umthetho obamba abathekeli usesigabeni 6.7.4. Nengabe awukafiki, namkha awukafaki ukulinganisa kwakho lokha kufunwa, ukulinganisa okwenziwe namkha okuvunywe yi-Employer’s Agent kuthathwa njengokulungileko. Emsebenzini olinganiswa kabusha, lokho kungasusa imali enengi.

Isinyathelo	Ngubani	Okufuze ukugcine
Inkambiso yokulinganisa	I-Employer’s Agent	Inkambiso ebhaliweko neemfuneko zayo
Isaziso sokulinganisa	I-Employer’s Agent	Umhla, isikhathi nengcenye ezakulinganiswa
Ukulinganisa ndawonye	Iinhlangothi zombili	Amaphepha wesayidi asayinelweko nge-chainage nengcenye
Isitatimende esisekelako	Umthekeli	Ukulinganisa kunye nesitatimende sakho senyanga
Isitifiketi sokulinganisa	I-Employer’s Agent	Inani elivunyelweneko lento ngayinye yebhili

Umthetho osebenzako ulula. Ungeqi ukulinganisa, begodu ungavumeli umsebenzi uvalwe ngaphambi kobana ulinganiswe. I-GCC 2015 ibuye ifune imvumo ye-Employer’s Agent ngaphambi kobana umsebenzi uvalwe. Nengabe umsele ugcwaliswa ngaphambi kobana umbheda nepayiphi kulinganiswe, usala uphikisana ngeenthombe.

Izinto Zobude Nezevolumu Zilinganiswa Njani?

Into ngayinye yebhili ilinganiswa ngeyunithi nangendlela ebekwe ziinchazelo zephrojekthi nezethulo ze-BOQ, ngokuvamileko nge-chainage emsebenzini wobude. Iinchazelo zobunjiniyela bomphakathi, njengeengcenye ze-SANS 1200 namkha iinchazelo ze-COLTO zomsebenzi wemigwaqo, zifaka imithetho yokulinganisa neyokukhokha yento ngayinye. Zifunde ngaphambi kobana ubeke intengo, ubuye uzifunde ngaphambi kobana ulinganise.

Izinto ezivamileko zobunjiniyela bomphakathi nendlela ezivamise ukulinganiswa ngayo:

Into	Iyunithi evamileko	Indlela elinganiswa ngayo ngokulandela i-chainage
Umsebenzi wodaka omkhulu (ukusika nokugcwalisa)	m³	Iingcenye ezinqamulela emabangeni we-chainage abekiweko, iivolumu phakathi kwazo
Amalaya wendlela	m³ namkha m²	Ubude phakathi kwee-chainage buphindwe ngobubanzi nobukhulu obubekiweko
Ama-kerb neemisele	m	Ubude ngokulandela umugqa, ngomhlobo
Amapayipi	m	Ubude phakathi kwee-chainage, ngobubanzi begodu kanengi ngezinga lokujula
Ukumba umsele	m³ namkha m	Ngokuya ngenchazelo, kanengi ngezinga lokujula nangeklasi yezinto
Ama-manhole namakamelo	Inani	Ukubala ngomhlobo nangokujula, kutjengiswa nge-chainage
Amatshwayo wendlela	m namkha m²	Ubude namkha ubukhulu bendawo ngomhlobo, nge-chainage

Amayunithi angehla avamile, akaqinanga. Isivumelwano esinye singakhokhela ukumba umsele ngemitha ye-cubic, esinye ngemitha yomsele ngamazinga wokujula. Inchazelo nezethulo ze-BOQ zithatha isiqunto. Nengabe aziviwani, kuphakamise ngaphambi kobana umsebenzi uthome.

Ubala Njani Iivolumu Zomsebenzi Wodaka Nge-Chainage?

Umsebenzi wodaka ngokuvamileko ulinganiswa ngeengcenye ezinqamulela ezithathwe emabangeni we-chainage aqinileko, ivolumu phakathi kweengcenye ezimbili ibalwa ngobukhulu bazo. Indlela evamileko yi-end-area method: thatha isilinganiso sobukhulu beengcenye ezimbili ezinqamulela, bese uphindaphinda ngebanga eliphakathi kwazo. Isivumelwano sakho namkha inchazelo ingabeka enye indlela, ngalokho hlola kuqala.

Ifomula ithi: ivolumu = (ubukhulu 1 + ubukhulu 2) / 2 × ibanga.

Nasi isibonelo sokusika ku-100 m, iingcenye zithathwa qobe 20 m:

Ukusuka ku-chainage	Ukuya ku-chainage	Ubukhulu ekuthomeni (m²)	Ubukhulu ekupheleni (m²)	Ubude (m)	Ivolumu (m³)
1+200	1+220	14.0	18.0	20	320
1+220	1+240	18.0	16.5	20	345
1+240	1+260	16.5	12.0	20	285
1+260	1+280	12.0	10.5	20	225
1+280	1+300	10.5	13.0	20	235
Isamba				100	1,410

Ngentengo yebhili yesibonelo ye-R85 nge-m³, ingcenye le ibiza i-R119,850. Nengabe i-BOQ ilinganisele i-1,200 m³ kobude obufanako, ukhokhelwa i-1,410 m³ oyilinganisileko, nengabe ukulinganisa kuvunyelwene.

Amazinga wehlabathi langaphambili sisisekelo sokubala lokhu. Vumelana ngawo ne-injiniya yesayidi ngaphambi kobana ukhuphe namkha umbe. Nakube ihlabathi selisusiwe, nobufakazi bakho busukile.

Usalinganisa umgwaqo ngeencwadi zesayidi nespredshiti? I-Sakha ihlanganisa ukulinganisa nokuchubeka, ukulinganisela iindleko ne-BOQ, neemtifiketi zokukhokhwa esofthiweni eyodwa ye-cloud eyakhelwe abathekeli bobunjiniyela bomphakathi baseSewula Afrika, kunye nephortali lapho i-injiniya ingahlola khona irekhodi: bona idemo yomkhiqizo.

Ukulinganisa Kabusha Kungena Njani Esitifiketini Sokukhokhwa?

Inyanga ngayinye, inani elivunyelweneko ukuya namhlanjesi lento ngayinye yebhili liphindwa ngentengo yayo, begodu isamba leso siba mugqa womsebenzi olinganisiweko esitifiketini. Njengombana iimtifiketi zihlanganisa koke okudlulileko, uqinisekisa inani elilinganiswe ukuya namhlanjesi, kungasi umsebenzi wenyanga le kwaphela. Iphoso elilungiswe nyangeni le lilungisa isamba.

Umbono olula wezinto ezintathu phakathi nesivumelwano:

Into yebhili	Inani le-BOQ (elilinganiselwako)	Okulinganiswe ukuya namhlanjesi	Intengo	Ivelu ukuya namhlanjesi
Ukusika ukuya ekugcwaliseni	18,000 m³	12,600 m³	R85	R1,071,000
Ipayiphi ye-uPVC, 250 mm	4,200 m	3,150 m	R1,240	R3,906,000
Ama-kerb, umhlobo 1	6,500 m	2,800 m	R310	R868,000
Isamba somsebenzi olinganisiweko ukuya namhlanjesi				R5,845,000

Amanani la ngawesibonelo. Isamba leso singena esitifiketini, ngaphambi kweenguquko, ukulungiswa kwentengo, ukubanjwa kwemali neenkhokhelo zangaphambilini. Ikhomba-ndlela lethu lehlelo lesitifiketi sokukhokhwa se-GCC lihlathulula okusele kwesitifiketi, iinkhathi zamalanga ama-7 nama-28 nokubanjwa kwemali.

Amaphuzu amabili ngamanani ahlukileko kwebhili:

Ukuguquka kwenani akusiyo iguquko ngokwako. Esivumelwaneni sokulinganisa kabusha, amanani kulindeleke bona aguquke. Iguquko kuguquko emsebenzini eyalwe ngaphasi kwesivumelwano. Kugcine kwehlukene emarekhodweni wakho.
Iinguquko ezikhulu zingathinta ezinye izinto. I-GCC 2015 ifaka indlela yokulungisa ama-General Items lokha isamba sazo zoke iinguquko sidlula iphesente elibekwe emininingwaneni yesivumelwano (isigaba 6.11). Landelela isamba leso njengombana uragela phambili.

Iimbango Zokulinganisa Kabusha Zithoma Kuphi?

Iimbango ezinengi zokulinganisa kabusha zithoma esayidini, iimveke ngaphambi kwesitifiketi, lokha inani lilinganiswa sekwephuzile, umuntu ayedwa namkha lingalinganiswa nakancani. Ngesikhathi i-Employer’s Agent ibuza ngalo, ihlabathi sele livaliwe begodu irekhodi libuthakathaka. Ukuvikela kuphungukile kunanyana yiyiphi imbango.

Iimbangela ezivamileko:

Akunamazinga wehlabathi langaphambili. Ngaphandle kwamazinga avunyelweneko ngaphambi kokumba, iivolumu zokusika nokugcwalisa ziqagelo.
Umsebenzi uvalwe ngaphambi kokulinganiswa. Amapayipi, imibheda namalaya alinganiswa ngokukhumbula namkha ngeenthombe.
Imikhawulo yeengcenye ibalwa kabili. Amaphepha wesayidi amabili womabili afaka i-chainage 2+500.
Ama-chainage equation awanakwa. Ubude obuqa ukulungiswa kabutjha komugqa bulinganiswa nge-chainage engasiyo.
Amayunithi angafani nebhili. Ukulinganisa umsele ngemitha lokha ibhili ikhokha ngemitha ye-cubic.
Ukuvumelana sekwephuzile. Ukulinganisa kuvunyelwana ngakho ngemva kweenyanga, abasebenzi sele bathuthile.

Isivivinyo sengcenye. Khetha nanyana yiyiphi ingcenye ye-200 m esivumelwaneni sakho sanje. Ungakghona ukutjengisa amazinga wehlabathi langaphambili, iingcenye ezinqamulela, amaphepha wokulinganisa asayinelweko nomugqa wesitifiketi angena kiwo, ngaphasi kwemizuzu elitjhumi? Nengabe akunjalo, ukulinganisa kwakho kuyingozi esitifiketini esilandelako nekhawundeni yokugcina.

Ngimaphi Amarekhodo Enza Ukulinganisa Kabusha Kuqine?

Irekhodi lokulinganisa kabusha liyaqina lokha inani ngalinye lingalandelwa ukusuka entweni yebhili ukuya ku-chainage, ukulinganisa okusayinelweko nesitifiketi. Umucu loyo ngiwo umhloli weklayenti lomphakathi azawulandela, kwesinye isikhathi eminyakeni ngemva kokuphela komsebenzi. Ngiso nesisekelo sevelu yokugcina yesivumelwano esetjenziswa yi-cidb kamva njengomlando womsebenzi.

Gcina, kiyo yoke ingcenye:

ihlolo lokuthoma lehlabathi namazinga avunyelweneko;
iingcenye ezinqamulela nokubalwa kwevolumu;
amaphepha wokulinganisa ndawonye asayinelweko, nge-chainage nangento yebhili;
iinthombe ezixhumene ne-chainage nomhla;
inombolo yesitifiketi inani ngalinye elikhokhelwe kiso.

Isofthiwe yokulawula ukwakhiwa kobunjiniyela bomphakathi efana ne-Sakha irekhoda ukulinganisa nokuchubeka nge-chainage nangengcenye, bese ikuxhumanisa ne-BOQ nesitifiketi sokukhokhwa. I-injiniya ingahlola irekhodi elifanako ngephortali, ngalokho ukuvumelana kwenzeka umsebenzi usabonakala. Amavelu wokugcina ahlanzekileko kusukela elangeni lokuthoma enza nobufakazi bakho bezinga le-CIDB CE bube lula ukubukhipha.

Imibuzo Ebuzwa Khulu

Yini ukulinganisa kabusha ekwakheni?

Yindlela yesivumelwano lapho ibhili yamanani ilinganisela umsebenzi kwaphela, begodu umthekeli akhokhelwa amanani alinganiswe kwamambala, ngamanani wentengo afakwe ethendeni. I-GCC 2015 ibiza lokhu ngokuthi yi-Re-measurement Contract. Kuvamile emsebenzini wobunjiniyela bomphakathi, lapho amanani wokugcina angaziwa ngesikhathi sethenda.

I-chainage efana ne-12+340 itjho ukuthini?

Itjho amakhilomitha ali-12 namamitha ama-340, namkha i-12,340 m, ngokulandela umugqa wokulawula ukusuka endaweni yawo yokuthoma. I-chainage inikela yoke ingcenye yomgwaqo, yepayiphi namkha yomsele wamanzi ireferensi eyodwa yemidwebo, ukubekwa komsebenzi, ukulinganisa nokukhokha.

Ngubani olinganisa umsebenzi ngaphasi kwe-GCC 2015?

I-Employer’s Agent ibeka ivelu elinganisiweko ngaphasi kwesigaba 6.7. Umthekeli ulinganisa bese afaka isitatimende esisekelako lokha kufunwa, begodu uba khona ekulinganiseni ndawonye ngemva kwesaziso. Nengabe umthekeli akafiki namkha akafaki, ukulinganisa kwe-Employer’s Agent kuthathwa njengokulungileko.

Ingabe ukweqa kwenani kuyiguquko?

Hayi ngokwako. Esivumelwaneni sokulinganisa kabusha, amanani kulindeleke bona ahluke kwebhili, begodu ukhokhelwa inani elilinganisiweko ngentengo yebhili. Iguquko kuguquko emsebenzini eyalwe ngaphasi kwesivumelwano, ilinganiswa ivelu ngaphasi kweengcenye zayo.

Iivolumu zomsebenzi wodaka zibalwa njani nge-chainage?

Ngokuvamileko nge-end-area method: thatha iingcenye ezinqamulela emabangeni we-chainage abekiweko, uthathe isilinganiso sobukhulu beengcenye ezimbili bese uphindaphinda ngebanga eliphakathi kwazo. Hlola indlela ebekwe yinchazelo yakho nesivumelwano ngaphambi kobana ulinganise.

Umucu Wamambala

Ukulinganisa kabusha kukhokhela lokho ongakufakazela. Qinisa amanani wakho wentengo ethendeni, bese uvumela amanani alinganisiweko athwale ivelu. Sebenzisa i-chainage njengekheli elilodwa lenani ngalinye. Vumelana ngamazinga wokuthoma ngaphambi kobana umbe, ungeqi nakanye ukulinganisa ndawonye, begodu ungavali umsebenzi ngaphambi kobana ulinganiswe. Landelela umugqa ngamunye wesitifiketi ubuyele ephepheni elisayinelweko nengcenyeni. Yenza lokho nyanga zoke, bese ikhawunda yokugcina iba sisamba, kungasi ilwisano.

Iinkhomba-ndlela ezihlangene: