is designed to transmit the reaction forces back to the main deck cantilever support bulkheads inner bottom and bottom structure application_number US 50791406 A description the preferred embodiment of the present invention contemplating a selectively deployable i e retractable reaction frame for self elevating platforms utilizing cantilever beams is described below with reference to the figures the utilization and deployment process of the present invention as utilized in conjunction with a drilling unit is also illustrated and discussed in detail herein referring to fig1 and 2 a self elevating drilling unit comprising for example a jack up vessel 1 also known as a jack up rig is positioned 21 for example 5 10 feet with the distance varying depending upon operator skills soil the vessel deployed etc so as to be situated adjacent 22 to a platform jacket 4 then elevated 20 to working position 23 first 7 and second 7 u2032 reaction frames associated with the stern of the vessel are shown in their retracted 24 position said frames mounted at the transom 11 of the jack up vessel 1 as shown in the retracted position 24 the reaction length of each of the frames is pivoted so that the length of each frame is situated adjacent to the transom providing a storage position requiring minimal space a minimum distance u201c d u201d is kept between the jack up vessel 1 and the platform 4 this proximity is required for the cantilever and drill floor to reach out an adequate distance to the drilling template 6 once the platform is elevated above the platform deck 5 as shown the reaction frames 7 7 u2032 being situated in their retracted position allows the.