Concrete thrust blocks are primarily used to achieve what purpose?

Concrete thrust blocks are specifically designed to counteract the forces exerted by water pressure on pipeline joints, particularly at bends and in areas where changes in direction occur. When water flows through a pipe, it generates pressure that can create a thrust force at joints and fittings. If this thrust force is not adequately managed, it can lead to joints opening or separating, which can result in leaks or damage to the pipeline system.

By using concrete thrust blocks, the force exerted by the water is effectively absorbed and directed into the surrounding soil, preventing the joints from opening under pressure. This provides stability and integrity to the water distribution system, ensuring that it functions properly without risking the alignment or sealing of the pipes.

The other choices relate to functions that concrete thrust blocks do not primarily serve. Supporting vertical loads is more relevant to structural elements rather than thrust control. Enhancing water flow is achieved through proper design and layout of the piping system, not through thrust blocks. Insulating pipes is related to temperature control and energy efficiency, which is outside the scope of what thrust blocks are intended to do.