CASE STUDY
GRP reversed effects of time
A main drainage culvert at a sewage treatment works had been undermined by corrosion, and needed to be renovated.
Thames Water enlisted the services of Insituform Technologies, which deployed its GRP lining to rehabilitate the culvert.
INSITUFORM TECHNOLOGIES With GRP liners providing achieve the installation.
(ITL) used its GRP lining a structural solution with a Once positioned, the
experience to renovate 950m high degree of chemical annulus between the host
of deteriorated main drainage resistance, this was seen as culvert and the liner was
culvert – as well as 13 the long-term solution to the filled using a cementitious
manholes – at the Crossness chemical attack problems grout. The joints between
Sewage Treatment Works that had caused the deterio- the liner sections were
(STW) in Abbey Wood, ration in the first place. sealed prior to grouting with
London, at a project value The profile sizes and shapes an epoxy-based mortar
of £1.6M. also enabled ITL to use which, once set, was further
Known as the 844G MDC man-entry techniques for the coated with a chemically
(Main Drainage Culvert) installation of the liners with resistant coating.
Rehabilitation Project, the access mainly via the existing For Thames Water, Ian
client for the work was manholes serving the culvert. Laber, construction team
Thames Water, which has But one segmental shaft had manager, said: “Given the
responsibility for the efficient to be sunk at one point to variety of sizes and shapes
functioning of the works. maintain effective and safe involved along the length
Design consultant for the access on one of the longer of the culvert, we had to
project was Hyder, and the manhole-to-manhole lengths. select a rehabilitation
main contractor for the work technique that would not
was Laing O’Rourke. Host culvert only enable us to solve and
ITL was subcontracted to Positioning GRP liner segments inside the culvert prior to grouting The liner segments – manufac- eliminate as far as possible
complete the GRP lining tured by Stanton Bonna the culvert deterioration
installation, along with some within the confines of the liner, along with the 13 of the culvert changed con- Concrete in 1.2m-long problem now, but also one
chemically resistant coating treatment plant. manholes providing access to siderably over the 950m sections – were transported that would prevent further
applications in both the it. The combination of GRP length that was in need of from the access manhole to the attack in the future. This was
lining and the manholes. Suffered attack and chemical-resistant coat- repair. Following the renova- lining position on trolleys. while at the same time
The MDC in need of Over the years, the concrete ings would prevent further tion, part of the length now They were then positioned providing a structurally
renovation was a reinforced fabric of the culvert had degradation, and restore the comprises a circular by hand using the location sound pipe over the long term
concrete structure running suffered attack from hydro- culvert’s life expectancy to in 1,400mm diameter profile, socket joints built into the at minimum loss of capacity.
beneath the works. gen sulphide and sulphuric excess of 50 years. part comprises a 945mm x liner ends, and supported The GRP solution gave us
There would be no impact acid, causing deterioration. It was decided that GRP 1,400mm D-shaped profile around the perimeter against this in an acceptable time
from the project on the The purpose of the lining lining offered the most effec- and the remainder comprises the inner wall of the host frame and budget.” ■
general public or local project was to rehabilitate the tive solution, mainly due to a 2,000mm x 1,400mm culvert, thereby requiring no
traffic as all works were culvert with a structural GRP the fact that the cross section ovoid profile. specialist equipment to www.insituform.com
DAF plants
Water NI 2009
for sewage and water treatment works
MEETING
THE CHALLENGES
Capacity range: 1 m3/hr - 1500 m3/hr per single unit
Thursday, 4 June 2009, Hilton Belfast Hotel
Dissolved Air Flotation applications:
www.waterni.net
•
COD/BOD Removal
The Northern Ireland water service
•
Solids Removal
has faced a difficult time, restructuring
its sole utility while undertaking vital •
Turbidity Reduction
upgrades to the region’s infrastructure
in line with EU legislation. Identifying
•
O & G Removal
the key challenges going forward and
how to meet them will be the subject of
•
Sludge Thickening
the conference Water NI 2009.
•
Clarifier
For more information and to register
please visit www.waterni.net •
Tertiary Treatment
•
200 m3/hr backwash water thickening at
Phosphate Removal UK WWTW.
Confirmed speakers
Nijhuis Water Technology
Clive Elphick___Group Policy Director___United Utilities plc
Conor Murphy MP___Minister for Regional Development___Northern Ireland
UK Branch:
Jo Aston___Director of Water Regulation___Northern Ireland Utility Regulator
Ronan Larkin___Finance Director___Northern Ireland Water
Tel: 0800 917 2611
Eleanor Gill___Chief Executive___Northern Ireland/Consumer Council
Dave Foster___Head of Water Management___NI Environment Agency
email: info@nijhuis-water.co.uk
Interested in being a sponsor or booking exhibition space?
web: www.nijhuis-water.co.uk
Three reasons why you should:
sludge
___1. Extensive pre-event promotion___2. Agreat opportunity for networking
___3. Strategic positioning in the fast moving Northern Irish water market effluent
influent
Formore information call Adam Jeffery on 020 8651 7147 or Matt Byron on 0161 903 1515
influent
Organised by Associated events Magazine partners
effluent
sludge
drain
drain
CONFERENCES
air air
Supported by
Open DAF Lamella DAF
t he Caring Eye on Water
March 2009 | WET News | 9
Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28