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How Colbonddrain Prefabricated Vertical Drains rapidly stablised weak soils ready for a major rail project, beating the timescale of traditional methods and significantly reducing construction time.
depths to which Colbonddrain can stabilise soil
achieved within six months
Marmaray suburban rail is a vital project for Istanbul. It joins the metro network across two continents, connecting Europe and Asia beneath the Boshphorus. In time it will also link the city to its growing suburbs. Shoring up and stabilising weak soils so they can be quickly built on is already a huge civil engineering challenge. However, the Marmaray project also wanted to avoid the costly and time-consuming methods of truck and machinery such a scheme would normally turn to.
Prefabricated Vertical Drains efficiently drain away pore-water created by the overburden, resulting in a stable subgrade ready for construction. PVDs can quickly stabilise soft soils even in 30-40m depths. Installing Colbonddrain CX 1000 PVDs allowed the contractor to dramatically reduce construction time. Colbonddrain delivered the calculated 0.9m settlement within six months rather than years.
City of Istanbul
Istanbul - Republic of Turkey
Reinforced Soil Structures
Soil Consolidation & Land Reclamation
By choosing Colbonddrain CX 1000, the Marmaray project averted the need for expensive truck and machinery, saving time and money. A stable subgrade was created for the railway superstructure in a short time, speeding construction. The coming decades will see it support a network serving millions of travellers.
Preventing damage to road structures by draining edges and soil embankments to maintain the soil's strength.
Cost-effective and sustainable schemes to optimise minimal available land space when creating new infrastructure. Reduces the need for removing in-situ materials or importing new materials.
On coastal reclamation works, the finished ground profile may not settle evenly. Releasing the groundwater and reducing the pore water pressure quickly allows you to complete consolidation settlement while reclamation works and infrastructure installation are underway.
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