Fildrain Case Study

Highway Drainage: A1 Dishforth to Leeming Improvement, UK 

Project Information

Client:Highways Agency
Contractor:Carillion – Morgan Sindall JV
Consultant:AECOM / Grontmij
Product:Fildrain Type 6
Quantity20,000 lin metres
Benefits:- Rapid installation in narrow restricted working area
- Re-use of excavated materials
- Avoid quarried stone
- Carbon Saving
- Barrier to protect sub base
- Material cost savings
- No materials to landfill

The Highways Agency commissioned the improvement of the A1 between Dishforth to Leeming. The road is an all purpose two lane carriageway carrying in the region of 50,000 vehicles per day. Constructed in the early 1960’s the route failed to meet current alignment standards and had a number of non-standard access junctions. The route had a poor safety, congestion and journey time record.

A joint venture between Carillion and Morgan Sindall carried out the 12 mile (19.3km) upgrade.

The Challenge

Highway drainage represents a significant part of any scheme including edge of carriageway drainage which protects the sub-base from water damage. This is normally achieved using a stone filled trench which means importing large quantities of carbon sensitive drainage stone from distant quarries. Achieving this on a live restricted main carriageway is problematic from a safety and ecological point of view. Any method which reduces the use of imported granular material along with reduced excavation and disturbance of the carriageway shoulder is welcome.

The Solution

The contractor proposed a findrain Type 6 from the Highways Construction Details drawing number F18 and Specification for Highways Works Clause 514 with Appendix 5/4.

The contractor chose the now BBA certified ABG Fildrain Type 6 as a suitable findrain, saving 4000tonnes against the crushed stone option. ABG Fildrain Type 6 provides vertical drainage on both sides whilst acting as a barrier protecting the sub-base from inundation from the verge. It is a double cuspated drainage geocomposite fully wrapped with a filter geotextile with an integral pipe sleave. The unit is laid alongside the trench, threaded with perforated pipe, dropped into a narrow trench and backfilled by pushing and compacting the excavated soil back into the trench adjacent to the drain. The surface is then covered with soil or a shallow apron of stone.

The ABG Service

Assistance with cost comparisons and provision of staged delivery to suit this narrow corridor site. Supplied relevant documentation to assist with approvals.

Fildrain Type 6 findrain geocomposite installed for vertical highway drainage on the A1

Minimum excavation using narrow trenching bucket when installing Fildrain findrainMinimum excavation using narrow trenching bucket
Fildrain findrain system installed into the drainage channelFildrain installed into the road edge drainage channel
ABG Fildrain geocomposite drainage system being backfilled on a highways applicationsBackfill by simply pushing and compacting fill next to ABG Fildrain Type 6
ABG Fildrain drainage geocomposite with integral sockABG Fildrain composite with integral sock to allow the threading of a perforated pipe ready for installation

Contact ABG today to discuss your project specific requirements and discover how ABG past experience and innovative products can help on your project.

This scheme is an example of implementing an idea from the Highways England "Managing Down Costs" Toolkit.

Fildrain - Highway Edge Drains

Fildrain drainage geocomposites are a cost effective alternative to traditional stone drainage for highway edge drains and concrete central reservation drainage. The geocomposite collects and channels liquids and gases to a carrier pipe for transportation to a suitable discharge point along the highway.

more...

Fildrain drainage geocompsoite for high edge drainage
 

Products

Fildrain - Highway Edge Drains

Fildrain drainage geocomposites are a cost effective alternative to traditional stone drainage for highway edge drains and concrete central reservation drainage. The geocomposite collects and channels liquids and gases to a carrier pipe for transportation to a suitable discharge point along the highway.

more...

Fildrain drainage geocompsoite for high edge drainage
 

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