Water, Sewage & Effluent November December 2018 | Page 24

Table 3: Comparative scoring of pipe bursting versus open-cut excavations for water mains
COMPARATIVE SUMMARY FOR 100m OF 110mm DIA WATER PIPE REPLACEMENT - URBAN AREA
Pipe Bursting Open-cut Pipe Bursting Open-cut
Total labour employed 37 37 1 1
2 Skilled labour 14 10 1 0
3 Cost per metre (R) (excl shoring) 533 894 1 0
4 Excavation vol (m 3 ) 15,4 99 1 0
5 Excavation area (m²) 14 90 1 0
6 Typical duration (days) 7 7 1 1
Total 6 2
References:
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Department of Water and
Sanitation (2017) National
Water Infrastructure
Framework (NWIF) Executive
Summary.
Efrat, S (2011) Pipe
Replacement in South Africa,
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https://www.thesouthafrican.
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https://tradingeconomics.com/
south-africa/unemployment-rate
https://tradingeconomics.com/
south-africa/business-confidence
Lekula, N (2018) Construction
Industry a Good Growth
Barometer, SA construction
3rd edition.
Municipal IQ (2018) Municipal
Hotspots Monitor.
Rosenberg, N (2004) Innovation
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Stanford University.
Statistics South Africa (2016) The
state of basic service delivery in
South Africa: In-depth analysis of
the Community Survey 2016 data,
Report No. 03-01-22 2016.
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Van Zyl. G (2018) SA’s inequality
problem: Can you be pro-business,
pro-poor at the same time?
www.biznews.com
A.C. Oosthuizen; J.L. van Rooy. u
About the SASTT
The South African Society for
Trenchless Technology (SASTT)
is celebrating 21 years since its
formation.
It has an active membership
who has a collective dedication
to the promotion of trenchless
technology. The Society is
currently developing SASTT
standard specifications for
trenchless technology.
It continues active dialogue
with professional organisations
such as IMIESA and is
currently making approaches
to the Construction Industry
Development Board (CIDB) to
encourage them to introduce
trenchless technology as one
of the designated categories
of specialist work to raise the
professionalism of contractors
working in the marketplace.
1.5 l
billion
22
sewers by trenchless methods is
even more favourable due to the
inherent health and safety risks of
deep excavations such as unstable
ground, the proximity to existing
structures and other complications
in urban areas.
Scoring (Yes - 1; No - 0)
1
•
Quantity
About the author
No. Performance Aspect
Water Sewage & Effluent November/December 2018
Neil van Rooyen has over
15 years’ experience in civil
engineering
construction
and has spent over 10 of
those years in the trenchless
industry. He is the previous
director of a trenchless
technology contractor and
served as a project manager
for
large
infrastructure
projects in Mauritius for two
years. Van Rooyen is the past
treasurer for the Southern
African Society for Trenchless
Technology (SASTT), and
currently serves as a board
member for SASTT. He is co-
founder of Chrysalis Projects
— a project management
company intent on supporting
emerging contractors. Van
Rooyen holds a BTech degree
in Civil Engineering from CPUT.
The number of litres lost in South Africa
every year through leaks.
www.waterafrica.co.za