Vertical band drains are a proven ground improvement technique for soft, compressible soils, and SGE delivers them in the UK through our CeTeau UK partnership. By installing prefabricated vertical drains into the ground and applying surcharge load above, water is forced from the soil along the drains, accelerating consolidation that would otherwise take years into a timeframe that fits a construction programme. This is the technique to consider on reclamation sites, soft alluvial ground, peat deposits and any project where settlement under load is the controlling design issue.
The CeTeau brand is one of the longest-established names in prefabricated vertical drains internationally. Through our partnership we bring that supply and installation capability to UK clients, combined with SGE’s earthworks and ground engineering delivery experience. The result is a band drain service that covers design support, supply, installation and integration with the wider earthworks programme under a single relationship.
Detailed Service Breakdown
Our vertical band drain service covers full design support, supply of CeTeau prefabricated drains and installation using purpose-built rigs. We work from the geotechnical design provided by the consulting engineer, advising on drain spacing, depth and discharge arrangements. Vertical band drains are typically combined with a surcharge embankment or preloading regime, and we coordinate with the earthworks contractor where this sits outside our package.
The drains themselves are a thin, flexible strip of grooved plastic core wrapped in a geotextile filter. They are installed vertically into the ground using a mandrel-driven rig, with the drain anchored at the base and cut off at the surface to discharge into a horizontal drainage blanket. Drain spacing typically runs from one to three metres in a triangular or square pattern, with spacing and depth selected to achieve the consolidation timescale the project programme requires.
Vertical band drain projects we deliver:
- Reclamation and infill sites over compressible ground
- Embankments over soft alluvial soils and peat
- Port, harbour and coastal infrastructure
- Highways and rail embankments on poor ground
- Industrial platforms where settlement is the controlling criterion
Industries and Sectors We Work With
Vertical band drains are used wherever load is being placed on soft, compressible ground. That puts them firmly in the infrastructure and reclamation sectors. Port and harbour operators use them on reclamation sites and embankments over soft alluvial deposits. Highway and rail authorities specify them on embankments crossing soft ground, particularly in estuarine and floodplain settings. Coastal defence schemes use them to accelerate consolidation beneath new defences. Industrial developers commission them on platforms where settlement is the critical design issue, particularly heavy industrial or warehousing developments over poor ground. Renewable energy schemes are an emerging application, particularly large solar developments on reclaimed land.
The technique is specialised, and the right design is essential. We support that design conversation alongside the consulting engineer and bring the installation experience to deliver it to schedule.
Our Process and Delivery Method
1. Design coordination
We work from the geotechnical design, confirming drain type, spacing, depth and discharge details. Where helpful we provide constructability input back to the designer.
2. Site set-up and working platform
A working platform is required to support the installation rigs over soft ground. We coordinate this with the earthworks contractor or deliver it ourselves where it is in scope.
3. Drain installation
Drains are installed to the design pattern using mandrel-driven rigs, with depth and pattern recorded as installation proceeds. Records are tied to the design drawings.
4. Discharge arrangements
Drainage blankets, horizontal drains or other discharge arrangements collect the expelled water at the surface so the consolidation can proceed cleanly.
5. Monitoring during surcharge
Settlement is monitored against the design prediction. Surcharge is typically maintained until settlement has reached the agreed criterion before the platform is handed over. Instrumentation including settlement plates, piezometers and inclinometers may be installed depending on the design, and we coordinate this with the monitoring contractor where it sits outside our scope.
6. Handover
Once consolidation criteria are met, the surcharge is removed where required and the platform is handed over with as-built records, installation logs and monitoring data. The next trade arrives to a foundation that will perform predictably under load.
Project Examples
SGE and CeTeau UK have delivered vertical band drain installations on infrastructure embankments, reclamation sites and industrial platforms across the UK and internationally. The CeTeau brand has been used on major port and reclamation projects worldwide, and we bring that delivery experience to UK schemes through the partnership.
Recent and reference projects have covered embankment construction over soft alluvial deposits, port and harbour reclamation, industrial platforms on poor ground, and infrastructure schemes where settlement under load was the controlling design issue. Each project has involved coordination with the geotechnical designer, the earthworks contractor and the surcharge programme, with installation completed to schedule and full records handed over for the post-installation monitoring period.
Benefits of Working With SGE and CeTeau UK
- Established international track record on band drain installation
- CeTeau drains supplied direct, removing supply chain risk
- Purpose-built installation rigs and experienced crews
- Combined delivery with earthworks and surcharge where required
- Detailed installation records tied to design drawings
- Geotechnical input available at design stage
Frequently Asked Questions
How do vertical band drains work?
Prefabricated drains are installed vertically into soft soil. When surcharge load is applied, water in the soil is forced along the drains to the surface, allowing the soil to consolidate much faster than it would naturally.
How deep can vertical band drains be installed?
Routine installations reach depths of 20 to 30 metres. Greater depths are achievable with the appropriate rigs and conditions.
How long does consolidation take with band drains?
Timescales depend on drain spacing, soil properties and surcharge height. Most schemes are designed to complete primary consolidation within months rather than years, which is the value of the technique.
Is a working platform always needed?
Yes, in nearly all cases. The installation rigs need a stable platform to operate on. Working platform design is part of the wider scheme.