CCMJ System

The CCMJ System is a versatile New Solution for delivering Diaphragm Wall & Pile Joint Integrity.  In particular the system:

  • Increases the effective depth range of  Diaphragm Walls (especially walls excavated by grab) and Secant Walls
  • Removes the requirement for Stop-ends
  • Allows for a Water Bar to be installed across the joint
  • Permits Continuous Reinforcement across the joint
  • Optimises Reinforcement Density and hence Concrete Flow
  • Facilitates joints at corners eliminating the need for “L” shaped cages and reducing single pour concrete volumes and slurry storage capacity requirements.
  • Enables the construction of smaller-dimension square and circular deep shafts than is possible with current methods.


The development and validation of the new system is currently being taken forward through an EU-funded project under the framework of Horizon 2020. Full details of the project can be found here.


If you have further queries or wish to discuss the CCMJ System further please contact

A printable information sheet is also available below:

CCMJ Printable Information Sheet
CCMJ Information Sheet.pdf
Adobe Acrobat document [195.0 KB]


John Coupland


John has worked as a consultant to the Skanska foundation companies both in the UK and USA since 2007. From conceptual design to actual construction his advice is sought by Clients, Engineers and Skanska estimators and construction teams. He provides constructability advice, planning and site support for foundation projects that have special technical or practical challenges. 

John’s experience of diaphragm walls began in the mid 1970s when he spent five years with ICOS. In the early 1980s he worked for three years in Hong Kong on diaphragm wall projects for the Mass Transit Island Line. During the 1990s John was Operations Manager then Operations Director for Bachy Soletanche in charge of many diaphragm wall and other foundation projects in the UK, Scandinavia and the Middle East. 

In 2001 he joined Cementation for the start of Channel Tunnel Rail Link phase 2. After advising on the site set up for the Stratford Box diaphragm wall he was JV Project Manager for Graham Road Shaft diaphragm walls, the deepest walls installed in the UK to date. 

A transfer to Cementation’s sister company in New York was next. Over the following five years he was instrumental in developing this organisation from a small driven pile company to the city’s leading geotechnical contractor capable of undertaking a wide range of foundation techniques. 

Since having problems with the “peel off” joint former in the 1990s John has been looking for a better solution and the CCMJ system is the result.



Julian Crawley


Julian retired as a Director of Cementation Skanska in 2011 – he now works as an Independent Consultant in Foundation Engineering, with particular emphasis on the practical aspects of Diaphragm Walling. 

Julian first encountered diaphragm walling with Colcrete Rodio in 1986. Further experience followed with Stent Soletanche as Project Manager for the Sizewell B plastic concrete cut-off, and as Contracts Manager for various projects in central London. After a spell in Malaysia (Kuala Lumpur Int’l Airport) and China (Guanzhou Metro), Julian returned to manage the Westminster JLE diaphragm wall box. He then represented Balfour Beatty-Stent in West Coast USA, before again returning to the UK to head up Major Projects at CTRL 420 and 440 in Kent. 

In 2001, Julian joined Cementation Skanska to manage the new major projects division – starting with CTRL Phase 2. He was Project Director for the Stratford Box diaphragm wall, as well as other major CTRL packages, followed by a series of other major projects in the UK. Julian was Cementation Director in the joint venture with Franki – installing diaphragm walls for three city-centre stations for the Amsterdam Metro NZ Lijn. 

Julian joined the Board of Cementation Skanska in 2007 and was specifically responsible for both Operations and Business Development. He worked hard to develop and support the Skanska Foundation Group – in the US, Scandinavia and Eastern Europe. He was also actively involved in promoting and improving Behavioural Safety and developing Innovation. Julian retired in 2011 on medical advice. 

Julian recognised that the improved accuracy and greater excavation depths in diaphragm walling is putting great pressure on current joint systems. The CCMJ Milled System has evolved from this problem – and can take diaphragm walling a further step forward.


European Patent 2732101 validated in: France, Germany, Italy & UK

US Patent 9371623


CCMJ Systems is a Corporate Member of the DFI

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© John Coupland