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Road 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

Roads built from the drain up.

Winsko builds and repairs roads: access roads to drilling locations for operators, and public roads for government. The work runs from drainage and earthworks through sand filling, stone base and compaction to asphalt, with plant from Winsko's own fleet.

For the Niger Delta Development Commission, Winsko carried out emergency repairs of failed and unmotorable road sections in Port Harcourt, Ughelli and Owerri in 2019. In 2021 it built the access road to the Owu-1 drilling location for Seplat Petroleum Development.

The photographs on this page are from Winsko's road works, stage by stage: drain formwork and concrete, grading, sand and stone base, compaction and asphalt.

Asphalt paver laying a new road surface in town, crew with rakes alongside
Asphalt laid by paverPhotograph

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

2019
Public road repairs
For the NDDC in Port Harcourt, Ughelli and Owerri
2021
Owu-1 access road
For Seplat Petroleum Development
3
States
Rivers, Delta and Imo
10+
Concrete mixers
As stated in the company profile

Scope of work · 06 work packages

What the work covers.

  • 01

    Access roads

    New roads to well sites and drilling locations, built to carry heavy plant.

  • 02

    Road rehabilitation

    Failed and unmotorable sections dug out and rebuilt, from base to surface.

  • 03

    Drainage

    Formwork, open concrete drains and closed drainage along the road.

  • 04

    Earthworks

    Clearing, excavation, grading and filling to the design levels.

  • 05

    Pavement layers

    Sharp sand filling and stone base, each layer compacted before the next.

  • 06

    Asphalt surfacing

    Asphalt laid by paver, rolled and finished to level.

Method · 06 stages

How a road section is built.

The sequence follows Winsko's own road photographs, with the checks that close each stage.

  1. 01

    Survey and setting out

    The route or failed section is surveyed, levels are taken, and the alignment, drains and traffic arrangements are set out before plant moves in.

    • Levels and alignment recorded
    • Existing services located
    • Traffic management in place
  2. 02

    Drainage

    Drains are excavated, formwork is set and concrete is placed, open or closed, so the new road can shed water instead of failing again.

    • Formwork lines and levels checked
    • Concrete cubes taken
    • Falls confirmed before backfill
    Timber formwork set in a trench beside a laterite road for a concrete drain
    Drain formworkPhotograph
  3. 03

    Excavation and grading

    Failed material is dug out to firm ground and the formation is graded to the design levels.

    • Soft spots removed
    • Formation levels checked
    • Spoil carted away
    Motor grader shaping a red laterite road formation, an excavator behind
    Grading the formationPhotograph
  4. 04

    Sand filling

    Sharp sand is spread in layers over the formation, watered and rolled to build the road up to level.

    • Layer thickness checked
    • Compaction tested per layer
    • Camber and levels checked
    Wide road corridor filled with sharp sand, a site engineer looking along it
    Sharp sand fillingPhotograph
  5. 05

    Stone base and compaction

    The stone base is laid over the sand and compacted with the roller until it is firm and true, ready for asphalt.

    • Base thickness checked
    • Density tested
    • Surface tolerance checked
    Roller compacting a new road base, an excavator working beside it
    CompactionPhotograph
  6. 06

    Asphalt

    The wearing course is laid by paver, rolled and finished to level, and the road is reopened to traffic.

    • Laying temperature checked
    • Thickness and levels checked
    • Markings and signs reinstated
    Asphalt paver laying a new surface on a town road, crew with rakes alongside
    Asphalt by paverPhotograph

Plant and equipment

Earthmoving plant from our own yard.

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

Grader
CAT 140G
Bulldozer
CAT D6H
Roller / compactor
1 unit
Excavators
3 × CAT 320 BL
Backhoe
CAT 446
Payloaders
CAT 966F and 950F
Tippers
3 × Mack, 25 t
Concrete mixers
More than 10
Low beds
Mack, 35 t and 40 t
Motor grader on a laterite road formation
GraderPhotograph
Roller and excavator on a new road base
Roller and excavatorPhotograph
Bulldozers, a wheel loader and a swamp buggy on the Winsko yard
Earthmoving plant on the yardPhotograph

From site

Road works, from drain to asphalt.

Photographs from Winsko's road works: concrete drains cast in formwork, compacted stone base and fresh asphalt. The roads on record are public roads repaired for the NDDC in 2019 and the Owu-1 access road built for Seplat in 2021.

Clients
Niger Delta Development Commission; Seplat Petroleum Development
Places
Port Harcourt, Ughelli, Owerri; Owu
Scope
Drainage, earthworks, sand and stone base, compaction and asphalt
Plant
Winsko's own grader, bulldozer, roller, excavators and tippers
Concrete drain cast in formwork along a road under constructionPhotograph
Concrete drain
Compacted stone base beside a red laterite verge, buildings behindPhotograph
Stone base
Freshly laid asphalt on a residential road, paver at work in the distancePhotograph
New asphalt
Finished asphalt road with a car driving on it and the paver beyondPhotograph
Road reopened

Track record

Roads on record.

From the list of jobs in the company profile.

  1. 2021Access road to the Owu-1 drilling locationOwu
  2. 2019Emergency repair of failed sections of Abowe RoadUghelli, Delta State
  3. 2019Emergency repair of failed sections of the Samagidi Agbarha road (lot 2)Ughelli, Delta State
  4. 2019Emergency repair of failed sections of Claret Catholic Church Road, World Bank AreaOwerri, Imo State
  5. 2019Emergency repair of the Ogbosisi to Umuguma market square roadOwerri, Imo State
  6. 2019Emergency repair of failed sections of Echendu Street, Elshcon Road and Road One, OkaniaPort Harcourt

Inspection and testing

Every layer tested before the next goes on.

Roads fail from the bottom up, so the checks start at the formation and follow every layer to the surface.

01Levels surveyFormation, layers and finished road match the design levelsWhenEach layerRecordLevel sheets
02Compaction testEach fill and base layer reached the specified densityWhenEach layerRecordField density results
03Concrete cubesDrains and culverts reached their design strengthWhenEvery pourRecordCube test results
04Material testsSand, stone and asphalt meet the specificationWhenOn deliveryRecordTest certificates
05Asphalt checksLaying temperature and finished thickness are rightWhenDuring layingRecordTemperature and thickness log
06As-builtWhat was built and whereWhenAt hand-overRecordAs-built drawings

Codes commonly specified for this work

  • FMW General SpecificationRoads and bridges (Federal Ministry of Works)
  • BS 1377Soil testing
  • BS EN 13285Unbound mixtures for road bases
  • BS EN 13108Asphalt mixtures
  • BS EN 12697Asphalt testing
  • BS EN 206Concrete for drains and culverts

Health, safety and environment

Plant, people and the public.

Road works happen where people live and drive. The controls protect the crew and the public alike.

  • 01

    Traffic

    Signed diversions, barriers and flag men, and work zones closed to the public.

  • 02

    Plant and people

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

  • 03

    Excavations

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

  • 04

    Hot asphalt

    Heat-resistant PPE, a cordon around the paver and burns first aid on site.

  • 05

    Dust and noise

    Water spraying, working hours agreed with the community and plant kept maintained.

Our HSE approach

FAQ · 04 questions

Questions, answered.

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

01

Does Winsko build roads?

Yes. Winsko builds access roads to well sites and drilling locations and repairs failed public roads, from drainage and earthworks to sand filling, stone base and asphalt. In 2021 it built the access road to the Owu-1 drilling location for Seplat Petroleum Development.

02

Which roads has Winsko repaired?

In 2019, for the Niger Delta Development Commission, Winsko carried out emergency repairs of failed sections of Echendu Street and Elshcon Road in Port Harcourt, Abowe Road and the Samagidi Agbarha road in Ughelli, and Claret Catholic Church Road and the Ogbosisi to Umuguma market square road in Owerri.

03

What plant does Winsko use for road works?

Its own grader (CAT 140G), bulldozer (CAT D6H), roller, excavators, payloaders, Mack tippers and concrete mixers, kept on the base in Port Harcourt and moved to site on its own low beds.

04

How is each road layer checked?

Levels are surveyed and compaction is tested on every fill and base layer before the next goes on, concrete cubes are taken from the drains, and asphalt is checked for laying temperature and finished thickness.

Also in the scope

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

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