Spray rig for lining an interior surface of a pipe

A method of applying a material to a pipe to line an interior surface of the pipe with the material, the method comprising:

• providing a spray rig within the pipe, the spray rig including
• a base configured to move over an interior surface of the pipe;
• a motor mounted to the base for movement with the base along the interior surface of the pipe;
• and
• a spray head including a mating component that removably couples the spray head to the motor, a mixing chamber extending from the mating component and including an internal cavity and a plurality of slots in fluid communication with the interior cavity, a feed tube that extends from the mixing chamber and is in fluid communication with the internal cavity, and an agitator coupled to the motor such that the motor is operable to rotate the agitator about an agitator axis;
• supplying a cementitious rehabilitating material and a quick setting additive to the feed tube such that the cementitious rehabilitating material and the quick setting additive are delivered to the internal cavity of the mixing chamber through the feed tube;
• and
• actuating the motor to drive rotation of the agitator for mixing the cementitious rehabilitating material and the quick setting additive to form the material within the mixing chamber such that the material is a mixture of the cementitious rehabilitating material and the quick setting additive;
• wherein the spray head includes a spray deflector mounted for rotation with the agitator by the motor and a plurality of deflectors that overlap at least a portion of the plurality of slots, and wherein actuating the motor to drive rotation of the agitator drives rotation of the spray deflector such that the plurality of deflectors rotates about the agitator axis to redirect spray of the material;
• and
• spraying the material onto the interior surface of the pipe.