The benefit of a Gantt chart isn't meeting deadlines, it is organizing work. You have all of the steps and what each of them depends on and a timeline. If something slips you know how to update your estimates for everything downstream. If several things are at risk you can see which ones have more critical time constraints and allocate resources effectively.

civial engineerin, is often small variation on every other structrure. as suchiit is easy to estimate as things didn't change. when things are very different is when they overrun schedules.