A Thrust Block is a supporting structure for pipelines where thrust forces are likely to occur. When a pipeline changes direction or size, thrust forces are generated by the fluids inside the pipeline, which can displace a pipe unless it is restrained by a thrust block or anchor. The thrust block or anchor must be designed to withstand the forces that are likely to develop and move the pipe. The forces are due to momentum and pressure of the liquid carried by the pipe, and expansion or contraction of the pipe itself.
Thrust block design is based on the thrust generated as well as the bearing pressure of the soil.