Monitoring of pipe jacking (CoJack)

Pipe jacking projects are becoming ever-more demanding. Thus, the traditional approach of managing these projects simply by means of structural calculations often does not suffice. With CoJack (Computing and Controlling Pipe-Jacking) we have developed a quality-assuring instrument for the monitoring of pipe jacking projects from planning to approval of construction. Even under the most difficult conditions, jacking projects become safer, more efficient and a great deal more manageable when faced with large jacking distances, tight and alternating curves, great depths and special geological challenges.

Three phases of project monitoring by means of CoJack

• Determination of the application limits for structural calculations
• Planning optimisation
• Recommendations for construction
• Visualisation on the internet of the data measured at the construction site
• Prompt determination of the current safety level and update of the structural calculations as a forecast for further jacking measures
• Verification of the achieved structural quality by a final “re-driving” of the jacking sections

The process sequence of CoJack.

Figure: Process sequence using CoJack

Some specific key benefits of CoJack:

• Location-independent use
• Early warning system because of prompt forecasts
• Controlled use of increased jacking forces where required
• Controlled continuation subsequent to unintended steering moves subject to compliance with additional conditions and requirements
• Prompt data exchange in real time via wireless modem
• Visualisation in a secured area on the internet
• Support of the in-situ construction supervision.