8. November 2017

Jacket pile-sleeve connections / Inspection and Repair of grouted connections

Older offshore jackets / offshore windmills / piled-grouted structures are not designed according to the requirements of the current design code. The old codes have for some cases proved not to give sufficient safety factor and capacity of the grouted pile / jacket connections.

IK Subsea can offer the service of drilling inspection holes for sampling and inspection for verifying the soundness of the grout and the grout connection.

IK Subsea has also developed a method for securing existing grouted pile-sleeve connection on offshore jackets.

This method has been used several times for Norwegian clients in connection with repair or reinstating old grouted connection.

The method consists of plugs and or special made pins, various ROV tools and possible injection alternatives for refilling of missing grout.A special made subsea drilling tool has been developed, drilling through sleeve, concrete and pile in the same operation.Special made plugs or pins are inserted to secure the connection between sleeve and pile.

Both local and global analyses are performed in order to verify the design of the repaired pile-sleeve connection and the plugs.