SIR SEEngineering, Delivery & Evolving Solutions Company
FR
Track record

Structures designed, roads engineered.

Assignments delivered by SIR SE in West and Central Africa, directly for contractors or as consultant and subcontractor to engineering firms.

CountriesSenegal · Togo · Gabon · BeninFieldsBridges · Roads · Water structures · Hydrogeology
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Principle elevation of a tall elevated reservoir supply main H tank shaft raft Elevated reservoir · principle
Principle elevation of a 40 m two-span girder bridge HFL 20.00 20.00 Elevation · principle abutment pier RC girder deck river
TogoKpegadjin (Kpégadjé), Haho prefecture · 2015 – 2016

40 m two-span girder bridge

Design and structural sizing: calculations and construction drawings of the reinforced-concrete girder bridge

Client
Midnight Sun, construction company, built the works
Client type
Contractor
40 mlength
2 × 20 mspans
10 mwidth

40 m reinforced-concrete girder bridge in two spans, 10 m wide, over the Toum river, 96 km from Lomé. The bridge was built by the contractor Midnight Sun.

Deliverables
  • Structural calculations
  • Formwork drawings
  • Reinforcement drawings
Source : Republic of Togo article, April 2017
Typical cross-section of a two-lane road: 7 m carriageway, shoulders, pavement layers and side ditches axis 1.50 carriageway 7.00 1.50 2,5 % 2,5 % wearing course base course sub-base subgrade ditch ditch
GabonRN1 Trans-Gabon highway · Ntoum – Kougouleu · 2020 – 2022

Ntoum – Kougouleu road (RN1)

Design engineer as subcontractor: upgrading the preliminary design (APS) to detailed design (APD), producing all topographic, hydraulic and structure drawings

Client
CEG (Consulting Engineers Group Ltd.), SIR SE as subcontractor
Client type
International engineering consultancy (subcontract)
81 kmof road
94culverts
12 kmof drains
APS → APDstudy stage

The dual-carriageway upgrade of the Libreville – Ntoum – Kougouleu axis is the first section of the Trans-Gabon highway (RN1). It is led by the Société Autoroutière du Gabon (SAG) under a public-private partnership. SIR SE delivered the detailed design over 81 km: high-modulus asphalt pavement, 12 km of trapezoidal and triangular drains, 94 box and pipe culverts. Six months on site, then two years working remotely.

Deliverables
  • Detailed design report
  • Topographic drawings
  • Hydraulic studies & drawings
  • Structure drawings
Source : Gabonreview, SAG and the Trans-Gabon highway
Principle elevation of a tall elevated reservoir supply main 12 m tank 1,000 m³ shaft raft Elevated reservoir · principle
BeninSèmè-Kpodji, Ouémé department

Tall elevated reservoirs

Studies and structural sizing of 1,000 m³ elevated reservoirs, 12 m high

Client
Subcontractor to SIGEM SA
Client type
Company (subcontracting)
1 000 m³capacity
12 mheight

Tall drinking-water structures: tank, shaft and foundations, sized for the supply network.

Deliverables
  • Structural calculations
  • Construction drawings
Principle hydrogeological section of a buried gas pipeline in a coastal area water table piezometer gas pipe trench clays coastal sands depth to water Hydrogeological section · principle
SenegalNorthern Segment of Senegal's gas network · Léona landfall – Gandon (Saint-Louis)

Northern gas pipeline: landfall – Gandon

Hydrogeological studies of the onshore pipeline route, between the landfall point and the Gandon power plant

Client
Fondasol Sénégal, SIR SE as subcontractor
Client type
Geotechnical engineering firm (subcontract)
85 kmpipeline (project)
40 kmonshore route
GTA → Gandongas hub → power plant

The Northern Segment of Senegal's gas network links the GTA (Grand Tortue Ahmeyim) gas hub to the Gandon power plant: 45 km offshore to the Léona landfall, then 40 km onshore to Gandon. In coastal areas, knowledge of the water table governs trench laying of the pipe.

Deliverables
  • Hydrogeological study report
Source : Réseau Gazier du Sénégal, Northern Segment

Who we work with

Our clients by trade, and what we bring them.

  • Construction contractorsDesign of the structures they build, and the BTP GES PRO management software.Midnight Sun (Togo)
  • Engineering firmsConsultancy or subcontracted studies, supporting their teams.CEG, Consulting Engineers Group (Gabon) · SIGEM SA (Benin) · Fondasol Sénégal
  • Governments, public owners and local authoritiesStudies, works supervision and owner's engineering.
  • NGOs and development projectsWater supply, drainage, hydraulic and agricultural works.
  • Fund managers, platforms, CFOsInformation and decision support with Suivi_Action.
  • Growers and agricultural projectsInstrumented greenhouses, irrigation and sensor monitoring.

Could your project be our next reference?

Bridge, road, reservoir or network: tell us what you need.

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