FES

Facility Engineering Services

Markets Served

Slip Form Solutions

Slip-forming is a continuous construction technique that operates continuously casting concrete with the use of moving form work. Significant time savings can result using this system. The system uses 3'-6” to 4 ft form typically, purpose built to the concrete profile required, that is continuously lifted using a hydraulic jacking system. The jacking rate is determined based on speed of the placement of the concrete and reinforcement as well as the setting time of the concrete. Careful monitoring of the position of the slip form allows the hydraulic jacking system to control of the plumb of the finished concrete. Openings with varying wall thicknesses and cross-sections can be accommodated and all contribute to an acceptable lifting rate. The slip-form rig typically comprises three levels of working:

Facility Engineering Services is one of the few consulting firms in the United States that is capable of designing these specialized forming systems. We are able to work with the jacking system vendor to develop a system that works for your needs.

Slip-Form Rig:

Upper reinforcement deck. The reinforcement deck is the uppermost deck on the slip-form rig and facilitates the placement of the of the reinforcement and a lifting frame for the slip form. This is typical on Feed Mills and Flour Mills. Occasionally this system is used to support the yolks to pull the forms.
Work deck. The working deck is the main deck of the slip-form rig. Typically this deck will support the hydraulic jacking system and provides the working platform from which to place and consolidate the freshly placed concrete. It is important that the concrete is placed in even layers around the forms. The control of the concrete quality, supply and setting rate is vitally important for slip form operations.
Finishing scaffold The finish scaffold is below the working deck and provides access to the inside and outside faces of the cast concrete as they emerge from formwork.