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Managed motorways: Project compendium

Dawson Construction plant

Carriageway embankment retaining structure


Project description

Drilling 450, 12m holes at 750mm and 900mm diameter either side of three bridges on the M25 between Junctions 27 and 29 Skinners, Muthering Lane and Wattons Green, to retain carriageway embankment. Drilling of each hole took approx 10 minutes.

LoDril advantages

LoDril was selected for this project due to its ability to get into tight situations with the minimum of additional works such as temporary platforms. LoDril can operate on an incline, and due to its long reach, access sites that would be unreachable with other rigs and still be able to drill vertical holes.

LoDril also has the advantage of low headroom and therefore has a lower centre of gravity compared to traditional leader rigs. It is ideal for highway embankment work. Using an excavator as the base carrier, mobility is simple and easy moving from one position to the next as there is little or no set-up time required.

Dawson Construction Plant LoDril is distributed by Dawson Construction Plant (DCP) in the UK and parts of Europe. It is available to hire which is a valuable way of assessing its benefits before purchase.

DCP has an experienced on-site support team ensuring qualified service and maintenance of LoDril rigs. DCP manufactures a wide range of other products from piling hammers both impact and vibro through to safety handling accessories.


Drilling depth of LoDril


Excavator weight


Attachment weight

LoDril specifications

  • Torque 24.3 KN/m (18,000 FT-LBS) at 30 rpm (Low drill speed)
  • Drill speeds(rpm) 30 (low) / 60 (high) / 100 (spin off)
  • Kelly winch 5.1t Bare drum
  • Kelly winch 30.5 m/min (33m/min)
  • Hoist 137 m/min
  • Lowering service winch 2.25t
  • Bare drum side tilt inclination 10°in both directions
  • Fore/aft inclination 10°each direction
  • Crowd stroke 910 mm
  • Drilling depth 31m
  • Crowd force 7t, Max 3.5t with friction kelly
  • Attachment weight 4.1t
  • LoDril operating pressure 310bar

Excavator specifications

  • CAT 323DL
  • Rated power 110kW
  • Hydraulic flow 2 X 205 l/min
  • Excavator weight 21.3t
  • Total weight 25.4t
  • Overall width 2.98m
  • Each track 700mm

Contact Toby Cliff for details 01908 246859



National Traffic Control Centre

Managing traffic

Managing traffic


The Highways Agency

Project description

The NTCC collects data from the roadside, assesses the impact of events and notifies drivers via variable message signs, traffic radio broadcasts, the Highways Agency’s website and a telephone service.


The challenge was to install over 2,000 roadside sensors to current Highways Agency standards and then to build a real-time decision support system to collect and assess the incoming data from these sensors to determine the optimal information to disseminate to road users to help them manage their journey and reduce overall network congestion.

Grontmij’s Role

Grontmij has been the Highways Agency’s technical advisor / employer’s agent on the project since 1997. Grontmij’s role includes overseeing all the work undertaken by the NTCC operator to provide, maintain and operate a national strategic traffic management and control centre for the entire English motorway and trunk road network.

Other parties

  • Serco, IBI

Key Facts

  • Grontmij involved 1997-present
  • NTCC became operational in 2003
  • Covers 14,000km of motorways and major trunk roads
  • Each month the NTCC provides information on over 3,000 incidents and 5,000 planned roadworks
  • Over 1.5M separate visits to every month

14 ,000km

Of motorways and major trunk roads covered


Number of separate visits to every month

A7 Dynamic Hard Shoulder Running
(Zaandam to Purmerend), the Netherlands


Rijkswaterstaat (The Dutch Highways Agency)

Project description

The £87M (€100M) Design & Build project included installation and commissioning of overhead gantries, CCTV camera systems, detector loops and Variable Message Signs, as well as necessary improvements to the safety barriers, drainage systems, signs and street lighting to enable operation of dynamic Hard Shoulder Running.


This was the first Design & Build Hard Shoulder running contract to include the traffic systems as well as incentives for optimizing traffic flow during construction. This provided challenges in achieving the right balance in the reference design and contract documentation between mandatory requirements and flexibility for the contractor.

Grontmij’s Role

Grontmij was the Rijkswaterstaat’s consultant. We investigated options to improve capacity to the required level, and recommended the preferred option based on a balance of cost, value for money, environmental impact and other relevant factors. We then prepared the Reference Design and the Design & Build contract documentation.

Other parties

  • Vialis

Key Facts

  • Opened 17 Dec 2007
  • 8.2km in length
  • The 1st Design & Build Hard Shoulder running contract to include the traffic systems


in length

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