Tobbermaclugg Pumping Station
 

Tobbermaclugg MainName:  Tobbermaclugg Pumping Station
Client:  Chartridge Development  
Consultants:  Design and Build Contract, Treatment System Services Ltd Designed the M&E and Coffey Construction Designed the Civil element of the works.
Location:  Lucan, Co Dublin
Project Value:  €4 million
Completion Date:  2009

Project Description:

Coffey Construction demonstrated the value of combining the two projects into one tender. Initially the client tendered the job under two separate contracts:

  • Contract no 1 Pumping Station, Tanks and Administration Building
  • Contract no 2 Pipelines and associated works

By combining the two projects Coffey Construction reduced the out turn costs by €1million and reduced the programme by 4 months. There were two contracts: one was D&B FIDIC (with Treatment Systems Services Ltd as main contractor and Coffey Construction Ltd as subcontractor); the other (Contract 2) was ‘build-only’ with Coffey Construction Ltd as main contractor (heavily amended IEI fixed price lump sum).

Concrete Works:

The design and build of a pumping station on the site. All the tanks were constructed using reinforced concrete.
Description of Project: 

  • Design and Build of Pumping Station and Storm Water Tank
  • Storm Water Tank 24.7m x 18m x 8.6m deep for 60,000 P.E
  • Dry well tank 24.7m x 18.0m x 8.6m deep
  • Wet well tank 4.6m x 5.8m x 8.5m deep
  • Installation and commissioning of 6 no pumps and associated kiosk and controls
  • Pumping capacity 371l/s

Coffey Construction completed all Civil Designs in-house. The reinforced concrete was designed by Tobin Consulting Engineers. 

Pipelines

Most of the large diameter pipework was in the build-only contract, which was essentially to construct all the following pipelines in parallel for a distance of 370 metres:

  • 2100mm dia. concrete storm sewer gravity
  • 900mm dia. concrete foul sewer feeding the pumping station
  • 500 dia. ductile iron rising main
  • 300 dia. ductile iron rising main

The excavation was mainly in limestone rock in difficult terrain in a constricted site area.  A crusher was employed to recycle the rock as suitable fill.  An existing stream (a tributary of the Griffeen River and therefore the Liffey) ran through the site parallel to the pipelines and had to be protected, requiring liaison with the Eastern Regional Fisheries Board. 

A settlement lagoon had to be constucted to dewater the excavations without polluting the watercourse.

Very large chambers had to be provided on the 900mm and 2100mm dia. lines.  These incorporated energy dissipation features due to the steep gradients.

These same pipelines overlapped into the TSSL contract where an additional 100 linear metres approx. of the 2100mm dia. pipe was laid along with varying lengths of the smaller pipe sizes connecting the pumping station. 

Extensive ductile iron pipework and ancillary works were required within the pumping station structure and administration building.

Through the commitment, creativity and knowledge of their skilled professionals, Alan O’Brien of Tobin Engineers and his team proved to provide an efficient and economical design for the winning of the contract. Design meetings were held with internally on a weekly basis to ensure the smooth running of the project and therefore alleviated any discrepancies that may have occurred on Tender Drawing. This ensured that the project was complete on time and on budget.

M+E Designer: Coffey Construction for a Partnership with their sister company Treatment Systems Services Limited (TSSL) for the contract. All M+E design was carried out in house at head office in Athenry Co. Galway where we have the experience of Process Engineers, Draughtsman, Technicians, M+E designers and Commissioners etc.

Designed to take flow of 9,500 m3/day and storm flow of 30,000 m3/day.

Coffey Group, Athenry, Co. Galway, Ireland Tel: +353 91 844356 Fax: +353 91 844519 Email: info@coffeygroup.com