Job Description

Client: National River Authority
Main Contractor: Dyer & Butler Ltd
Location: River Thames Radcot & Shifford, Oxfordshire
Contract Duration: 5 Days
Size: 2,228 m² (Radcot 958.3m² – Shifford 1.269.7m² )
 

Project Overview

The roads leading to the Locks had become a pot holed, crumbling surface in a poor state of repair. A mile off the beaten track, Shifford lock entrance road started after a nature reserve. The track had the Thames on one side and open fields on the other. Our job was to insitu recycle the road and hand it back with a cross fall away from the river.

 

Scope of Works

Firstly, we cut back the tree branches that hung over the road to avoid damaging them or our machines! Then we cleared the edge of the road to define its exact width. A motor grader carried this out. At this time, we cleared the vegetation in the middle of the road. Also, we then dug hole to confirm that the depth of the BT cable was below our recycled depth of 225mm.

In addition, a tractor and spreader spread the cement on to the road surface at a predetermined rate. This was based on the results of the laboratory trials carried out on the materials. The Wirtgen WR 2400 followed behind, mixing the cement to a depth of 225mm. Furthermore, the Wirtgen is fully computerised and enables the depth of mixing to the required specification. The treated material was graded and compacted to final levels and tolerances using a single plane laser on the grader and 16 tonne smooth drum roller.

Finally, following on from the recycling, the roads were handed over to Dyer & Butler Ltd, who put edge boards down and laid the 50mm tarmac wearing course. By recycling the existing pavement, Beach were able to save not only the removal of 1000m³ of material, but also the import of 600 tonnes of base course tarmac and 1400 tonnes of 6f2 material.