abstract coverings for structures which can be installed in the ground are known in order to lock the covering on the structure closures are known which comprise a snap bolt which is designed in such a way and is mounted movably on the covering against the force of a spring device in such a way that during closing of the covering the snap bolt is forced back and snaps in behind a counterbearing fixed to the structure in a closure position to simplify the arrangement and also to improve durability it is proposed that the snap bolt is mounted in a housing which can be fastened in a housing receptacle of the covering application_number US 201314442511 A description in the following description the same reference numerals shall be used for components that are identical and have an identical function as is shown in fig1 3 a structure that can be installed in the ground u2014 in this case as exemplified by a drainage channel u2014 comprises a structure 10 having a channel body 11 the upper edge of which is formed by frames 12 in the known manner a cover 20 is placed with the underside of its bearing surface 24 on the drainage channel 10 or between the frames encompassing it.