Abstract: A reusable support structure for installing a trench liner in a trench formed in the ground, and a method for doing so. The support structure includes a crossbar having two ends and spanning the trench. The top end of a threaded rod is adjustably connected to the crossbar by a nut threaded onto the rod above the crossbar. The bottom end of the threaded rod is connected to the bottom or floor portion of the liner by a nut threaded onto the rod below the bottom floor portion of the liner, the threaded rod thus passing through the liner floor. A plurality of these trench liners are installed in the trench, and are connected together by one or more tabs at one end of each trench liner that coact with the opposite end of the next adjacent trench liner to connect the two trench liners together. The top nut then rests on the crossbar, supporting the rod, and in turn the trench liner, at the proper height in the trench, the height being adjustable by turning the nut.