Jul 20, 2012
Post-2010 construction activity slump continuesBack
Construction|Engineering|Parktown|Africa|Cement|Civils|Cleaning|Concrete|Environment|Flow|Housing|Pipe|Pipes|PROJECT|Projects|Safety|Trenchless Technologies|Water|Africa|South Africa|Cleaning|Directional Drilling Services|Fibre-optic Infrastructure|Flow|Maintenance|Municipal Infrastructure|Pipes|Service|Services|Steel|Drilling|Infrastructure|Sam Efrat|Water|Pipe|Valves|The 2010 FIFA World Cup|World Cup Games|Fibre Optic
© Reuse this
“The big investments made by municipalities that hosted World Cup games have resulted in them spending most of their budget and they are still recovering,” says Trenchless Technologies MD Sam Efrat.
“A lack of recovery of municipal rates and taxes has put additional pressure on municipal budgets and this has resulted in a decline in municipal infrastructure spending,” he adds.
Efrat notes that companies that service the municipal infrastructure sector, such as Trenchless Technologies, have seen a decline in the projects put out to tender since 2010.
He points out that the company was involved in seven rehabilitation projects in 2010, five projects in 2011, and three projects in the first half of this year.
“Fortunately, we have seen an increase in the amount of tendered work available this year and are looking forward to a steady increase in projects in the second half of the year,” says Efrat.
He notes that the future outlook is very promising, as it is estimated that around R60-billion a year has to be spent over the next ten years to cope with the infrastructure required to secure South Africa’s water supplies, and much of this work will involve rehabilitation of our ageing municipal sewer and water pipes.
The company makes use of the directional drilling method to install fibre-optic infrastructure, as well as water and sewer pipes. As a result of the fibre optic roll-out and the increased rate of urbanisation in South Africa, demand has increased for directional drilling services.
Efrat says there has been an increase in the number of tenders involving directional drilling, particularly on the long-haul fibre-optic networks between South Africa’s major cities.
The drilling process involves three main stages: drilling a pilot hole, pilot-hole enlargement, and pullback installation of the carrier pipe. The technique can be used in various ground conditions. The borehole is supported by a bentonite drilling fluid, which prevents the borehole from collapsing.
“We are involved as a subcontractor to specialist contractors in the rehabilitation of concrete structures Con-Solve Civils. Con-Solve Civils is responsible for relining the reservoir, as the concrete has cracked and requires maintenance. A portion of Con-Solve Civils’ contract also requires the rehabilitation of the old 600 NB steel feeder pipes from one reservoir to another and the (bulk) pipe delivering water from the reservoir to the network.
Our work entailed cleaning the pipes, conducting closed-circuit television inspections and sliplining and grouting in place a new 560 PE 100 PN 10 pipe into the old 600 NB steel pipe and the installation of numerous new valves and chambers,” says Efrat.
The new high-density polyethylene pipe (HDPE) has a smaller diameter than the old steel pipe, but as it has a much smoother bore with a low coefficient of friction and better flow properties and this allows the replacement of the larger steel pipe with the smaller HDPE pipe while still maintaining the same amount of flow down the pipe.
Further, in July, Trenchless Technologies started work on Phase 5 of the Barberton asbes- tos cement pipe replacement project, using the trenchless technique of pipe bursting, where hydraulic rod pullers, as well as percussive hammers, are used to crack old pipe, which is pushed into the surrounding soil and simultaneously replaced with a new HDPE pipe that is pulled into position,” he says.
In urban areas where there are more pavements, roadways and housing, trenchless technology is more cost efficient and results in fewer disruptions than the conventional excavation method previously used.
“A lot of townships employ midblock sewers and it is also difficult to gain access to people’s properties to undertake the replacement by excavation – it is also extremely disruptive,” says Efrat.
He adds that trenchless technology mitigates many health and safety issues experienced when excavating in busy roadways, emits less carbon emissions and has less of an impact on the environment than traditional pipe-laying methods.
Edited by: Chanel de Bruyn© Reuse this Comment Guidelines (150 word limit)
Other Construction Materials and Equipment News
Construction products specialist Verni’s Betocrete C-16, an organic, liquid concrete admixture for crystalline waterproofing unlike others, prevents the formation of lumps, says Verni director Jenna-Lee Backos. Beyond its waterproofing properties, Betocrete C-16...
BE Lite Technologies is involved in the manufacturing and distribution of light-emitting diode (LED) lights. It also employs a dynamic engineer who is able to develop lights to fit to customers’ demands. It currently provides a number of products to the mining...
Updated 18 minutes ago Celebrated international designers are collaborating with South African crafters and designers at Africa’s international design fair, GUILD, in Cape Town. The fair, currently on at the Victoria and Alfred Waterfront, is considered a fillip for South African...
Updated 42 minutes ago In the marble atrium of the Mammy Yoko hotel in Freetown, manager Nuno Neves has spotted something he has not seen since the Ebola virus struck Sierra Leone nine months ago: foreign businessmen. The Radisson Blu chain opened the four-star hotel in April to cater for...
Updated 53 minutes ago The US and five East African countries pledged on Thursday to ease trade flows and set the stage for more US investment, a program that could be extended to other parts of Africa. The agreement commits Tanzania, Kenya, Uganda, Rwanda and Burundi to cooperate with the...
Recent Research Reports
Construction 2015: A review of South Africa’s construction sector (PDF Report)
Creamer Media’s Construction 2015 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; the key participants in the sector; local construction demand; geographic diversification;...
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
Defence 2014: A review of South Africa's defence industry (PDF Report)
Creamer Media’s Defence 2014 report examines South Africa’s defence industry, with particular focus on the key participants in the sector, the innovations that have come out of the sector, local and export demand, South Africa’s controversial multibillion-rand...
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
This Week's Magazine
National flag carrier South African Airways (SAA) is in an advanced stage of renegotiating its deal with European airliner manufacturer Airbus to acquire A320 single-aisle (or narrow body) aircraft. The aim is to replace ten of the aircraft still on order with five...
Worldwide, the main thrust in the ports industry over the past decade or more has been to increase efficiency. Traditionally, ports have been run by engineers and mariners and, in the past, increasing a port’s capacity was achieved by expanding the harbour. “That has...
What do you do when an elephant has a toothache? You call Dr Gerhard Steenkamp from the University of Pretoria’s (UP’s) faculty of veterinary science, Onderstepoort, one of only two elephant ‘dentists’ in the world.
The 2015 Sanlam/Business Partners Entrepreneur of the Year (EOY) competition was launched earlier this month in Johannesburg, with the main focus on creating and inspiring entrepreneurs to create jobs and boost the economy.
In a recent letter to the editor that I sent to Engineering News (Concerns regarding South African portion of Square Kilometre Array) and in a follow-up article elaborating further (We must start preparations to build our own synchrotron light source), I stated my...