A11 Ketteringham, Norfolk
The Highways Agency brief was to introduce de-acceleration zones along a half mile stretch of the A11 by reducing carriageway widths with the introduction of new kerb runs.
W S Atkins designed the scheme specifying the use of the Scan Kerb stick down concrete kerb, to reduce the overall contract period and reduce the need for heavy plant. The use of Scan Kerb meant no excavation and the need for waste removal, the kerbs could be simply stuck to the existing concrete road surface.
After product searches and discussions, Scan Kerb was proposed as a much quicker and less disruptive alternative
Scan Kerb is a reinforced concrete stick down kerb which has highways agency approval under (section 1101 paragraph 2 of Highway works.)
The standard B1 kerb (half batter profile) is delivered to site with the adhesive pre bonded to the underside of the kerb, the only preparation is to sweep the highway to remove dust and debris, prime the premarked kerb line with Scan coat, and bed the kerb in place, in cold weather it may be advisable to heat the road surface and underside of kerb to help speed up the adhesion process.
The project was completed to the satisfaction of all parties in February/March 2011
The key factors effecting the choice of Scan Kerb on this project, was the short contract period, the use of Scan Kerb has major environmental and health & safety advantages, no excavation greatly reduced the need for site plant and removal of waste to land fill, the weight of the individual kerbs meant that they could be installed by hand.
The quality of the existing concrete road surface was still good with little or no surface preparation required, initial trials were done to convince the contractor as to there suitability for the project, they were very sceptical about the kerbs ability to withsatand the rolling of the ashalt pavement behind the kerb, but later admitted to being surprised by the kerbs performance.
In spite of some major delays in getting the project started, the use of Scan Kerbs helped to reduce the project time, and surprised the contractors as to the durability of the kerb.
Points of Interest
- Quick installation required
- New kerb system to be fixed to the existing concrete road
- Wanted to remove the need for heavy plant and excavation
- Client wanted a quick high quality solution
Product: Scan kerb Type B
Scan Kerb B1– 1410No.
Scan Kerb B8- 54No.
Scan Kerb C1- 542No.
Scan Coat 25Litre – 4No.
Scan Strip – 150No.
W S Atkins
Lefarge�Costain J V
Grafton Merchanting GB