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Civil Engineering Construction

Roads, civil & mechanical. Roads and civil engineering construction on land and at the waterside, and mechanical construction and fabrication in Winsko's own covered workshop.

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The service

Foundations, concrete and civil works, on land and at the waterside.

Alongside the oil and gas work, Winsko builds the civil works around it: piled and concrete foundations for platforms and equipment, reinforced concrete tanks, bund walls, equipment bases and boreholes, at flow stations, gas plants, well sites and loading areas.

Recent civil jobs include a reinforced concrete tank at San Bath to support barging operations and a borehole at a flow station in 2024, and a bund wall with its appurtenances for a diesel tank at Ajoki in 2023. Earlier work includes the civil works for a gas-lift bulk line at the Cawthorne Channel gas plant and piling foundations at the Diebu Creek flow station.

The excavators, payloaders and concrete mixers are Winsko's own, so a civil job is planned around plant that is already on the yard. Road building has its own page under Road Construction.

Caterpillar bulldozers, a wheel loader and a swamp buggy on the Winsko yard by the water
Earthmoving plant on the yardPhotograph

Where it sits in the project lifecycle

  1. 01Engineering / Design
  2. 02Procurement & Logistics
  3. 03Fabrication
  4. 04Construction / Roads / Erection / Installation
  5. 05Testing / Pre-Commissioning
  6. 06Commissioning
  7. 07Operation, Maintenance & Handover

By the numbers

10+
Concrete mixers
As stated in the company profile
3
Excavators
CAT 320 BL, on the equipment register
2024
Concrete tank
Reinforced concrete tank at San Bath, to support barging
2014
Piling foundations
At the Diebu Creek flow station

Scope of work · 06 work packages

What the work covers.

  • 01

    Foundations and piling

    Piled and concrete foundations for platforms, tanks, pipe supports and equipment.

  • 02

    Reinforced concrete tanks

    Tanks and pits cast in place, from reinforcement to watertight finish.

  • 03

    Bund walls and containment

    Bunds around fuel and diesel tanks, with their drains and appurtenances.

  • 04

    Equipment bases

    Plinths and slabs for skids, pumps, generators and pipe supports.

  • 05

    Boreholes

    Borehole drilling at flow stations and work sites.

  • 06

    Site preparation

    Clearing, grading, filling and site drainage for locations and yards.

Method · 05 stages

How a concrete structure is built.

Tanks, bunds and bases follow the same sequence, with the checks that close each stage.

  1. 01

    Survey and setting out

    The site is surveyed, existing pipes and cables are located, and the structure is set out to the drawings.

    • Setting-out checked against drawings
    • Buried services located
    • Permit to work in place
  2. 02

    Excavation and foundation

    The ground is excavated to firm material, piled where the soil is weak, and blinded ready for the reinforcement.

    • Formation inspected
    • Pile positions and depths recorded
    • Blinding levels checked
    Bulldozers, a wheel loader and a swamp buggy on the yard by the water
    Earthmoving plantPhotograph
  3. 03

    Reinforcement and formwork

    Steel is fixed to the bending schedule and the formwork is set true, with water bars where a tank or bund has to hold liquid.

    • Bar sizes, spacing and cover checked
    • Formwork line and level checked
    • Water bars and embedments in place
  4. 04

    Concrete and curing

    Concrete is placed and vibrated in one continuous pour where possible, then cured so it reaches its strength.

    • Slump checked at delivery
    • Cubes taken from every pour
    • Curing kept up for the specified days
  5. 05

    Test and hand over

    Tanks and bunds are filled and watched for leaks, and the structure is handed over with its records.

    • Water-tightness test passed
    • Cube results reviewed
    • As-built drawings issued

Plant and equipment

A civil fleet, already on the yard.

Every item below is on Winsko's equipment register, kept at the Trans-Woji base.

Excavators
3 × CAT 320 BL
Backhoe
CAT 446
Payloaders
CAT 966F and 950F
Bulldozer
CAT D6H
Concrete mixers
More than 10
Tippers
3 × Mack, 25 t
Pumps
4 flush pumps, 4" suction
Cranes
Tyre cranes from 22 t to 50 t
Bulldozers, a wheel loader and a swamp buggy on the yard
Earthmoving plantPhotograph
Crawler cranes on the yard
Cranes on the yardPhotograph
Crane and excavator on a barge in a creek
Plant on a barge in the creekPhotograph

Track record

Civil works on record.

A selection from the list of jobs in the company profile.

  1. 2024Reinforced concrete tank to support barging operationsSan Bath
  2. 2024Borehole drilling at a flow stationOk-Oziengbe
  3. 2023Bund wall construction and appurtenances for a diesel tankAjoki
  4. 2018Civil works for the gas-lift bulk line installation at the gas plantCawthorne Channel
  5. 2014Piling foundation works at the flow stationDiebu Creek

Inspection and testing

Strength and water-tightness, proven before hand-over.

A tank or a bund has one job: to hold. The checks follow the concrete from the batch to the water test.

01Levels surveyFoundations and structures sit at the design levelsWhenEach stageRecordLevel sheets
02Reinforcement checkBar sizes, spacing and cover match the drawingsWhenBefore each pourRecordPre-pour checklist
03Slump testThe concrete is workable as specifiedWhenEvery deliveryRecordSlump results
04Concrete cubesThe concrete reached its design strengthWhenEvery pourRecordCube test results
05Water testTanks and bunds hold without leakingWhenBefore hand-overRecordTest report
06As-builtWhat was built and whereWhenAt hand-overRecordAs-built drawings

Codes commonly specified for this work

  • BS EN 206Concrete
  • BS EN 12390Testing hardened concrete
  • BS EN 1992Design of concrete structures
  • BS EN 1992-3Liquid-retaining structures
  • BS EN 1997Geotechnical design
  • BS 1377Soil testing

Health, safety and environment

Safe excavations, safe pours.

Civil works on a live oil and gas site share the ground with pipes, cables and process plant. The controls protect the crew and the facility.

  • 01

    Buried services

    Drawings checked, services located and hand-dug near live lines, under a permit to work.

  • 02

    Excavations

    Battered or supported sides, barriers at the edge and no entry without a permit.

  • 03

    Plant and people

    Banksmen for reversing plant, exclusion zones around machines and hi-vis for everyone on site.

  • 04

    Concrete

    Gloves, boots and eye protection against wet cement, and washing facilities on site.

  • 05

    Working near water

    Life jackets at the waterside and on barges, and rescue equipment on hand.

Our HSE approach

FAQ · 03 questions

Questions, answered.

Short answers about civil engineering construction at Winsko, from the company profile.

01

What civil engineering works does Winsko carry out?

Piled and concrete foundations, reinforced concrete tanks, bund walls and containment, equipment bases, boreholes and site preparation, at flow stations, gas plants, well sites and loading areas. Roads are covered on the Road Construction page.

02

Does Winsko build concrete tanks and bund walls?

Yes. In 2024 Winsko built a reinforced concrete tank at San Bath to support barging operations, and in 2023 it built a bund wall with its appurtenances for a diesel tank at Ajoki.

03

Does Winsko own its earthmoving plant?

Yes. The fleet includes a bulldozer, grader, roller, excavators, Mack tippers, payloaders and concrete mixers, kept on its base in Port Harcourt.

Also in the scope

07Start a project

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Operational base / jettyElshcon Close, Trans-Woji (Slaughter), Port Harcourt, Rivers State

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