There is work being done outside workplace, tripped and hurt my knees and hands are they at fault ?

With information provided the best I can say is "maybe". Also, when assessing fault, a lawyer needs to evaluate how much fault might reasonably be assessed on not just the workers and their employer, but on the plaintiff as well. The at-fault party is only responsible to pay damages based on their percentage share of the fault. A lawyer will need to look at pictures of the condition, or at least the area to get an idea what the condition would have looked like. Factors will include whether there was an reasonable alternative pathway for pedestrians to get past the area, whether there was warning signs; whether it occurred in during day or night; what better way they could have accomplished this making reasonable accommodations for pedestrians; etc.  This is just a sample of the factors to be looked at.  As a lawyer litigating personal injury claims for over 28 years, I can tell you these issues take an quality lawyer to properly evaluate and develop. For that reason you should be very careful before hiring one of the mass advertising TV type firms who are handling your case along with the thousands of other cases they bring in. There are many fine lawyers in Florida and recommend you seek out assistance of such a lawyer.