At approximately a quarter past 15:00hrs Engine 22 was dispatched to the bleeding call at the intersection of Linda Ln and Cravens Rd. Upon arrival with FBCEMS Medic #10 a patient presented suffering a serious saw wound. During drainage construction a section of concrete culvert move unexpectedly causing the workers saw to impact his chest. Immediately assisting with patient care Engine 22 requested Air Medical, Battalion 21 and Tower 22 to assist at the LZ. Upon packaging and treatment being completed the patient was moved to the LZ where patient care was transferred to Memorial Herman Life Flight 4. Upon safe departure of the aircraft all units returned to service.