Instructions
Equip your Rock Raiders with hammers. Remove their shovels and turn off the "Clear Rubble" option, or they will waste time clearing paths of rubble instead of reinforcing walls.
Set the "Reinforce Walls" option to the highest priority, and the Rock Raiders will automatically being reinforcing. Teleport Rock Raiders into areas requiring reinforcement.
Reinforce hard rock walls, as no other areas can be reinforced. Remember to reassign priorities and redeploy your Rock Raiders after the reinforcement is complete.