A ditch shoring unit includes at least a horizontal support frame composed of longitudinally-extending, transversely-adjustable girders made of profile steel parts and having guide heads mounted thereon, as well as a plurality of pile-driving planks which in their cross section, are generally wave-shaped and which are provided on their inner side with a guide channel for a positive locking reception of an associated guide head of the support frame therein. Each pile-driving plank is also provided on its inner side with abutments which are arranged in a vertically, supermposed, spaced-apart manner and locking means are provided on the longitudinal girders of the support frame having a locking element which is moveable into and out of the area between two superimposed abutments of an associated pile-driving plank.
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