The document discusses construction techniques and practices for civil engineering projects. It provides details on pipe jacking, a method used to lay sewer pipes in deep ground without extensive trench digging. The process involves excavating soil from a temporary shaft using a cutting head machine, crushing the soil into slurry and transporting it above ground. The new pipe is installed behind the cutting head as it moves toward a receiving station, where a new manhole is then constructed before backfilling the area.