Maritime  and offshore Crane Structures


Most types of sea port handling systems will need steel structure frame system to attach the loading cranes, gantry system or discharge conveyers

We are able to produce most of the types of these structures according to the required design or could include the study and design to our scope of work by consulting the biggest engineering companies in Europe and USA.


Whether it was fixed structure, fixed pile system or fixed base with overhead truss structures, or deep into their specific types, Al Rai is able to fabricate, transport and install the below types of loading systems:


  1. Gantry Crane – Single beam (mono girder): A gantry crane has a hoist in a fixed machinery house or on a trolley that runs horizontally along rails, usually fitted on a single beam (mono-girder) or two beams (twin-girder). The crane frame is supported on a gantry system with equalized beams and wheels that run on the gantry rail, usually perpendicular to the trolley travel direction. These cranes come in all sizes, and some can move very heavy loads, particularly the extremely large examples used in shipyards or industrial installations.
  2. Container Crane: A special version is the container crane (or "Portainer" crane, named by the first manufacturer), designed for loading and unloading ship-borne containers at a port.
  3. Deck crane: Located on the ships and boats, these are used for cargo operations or boat unloading and retrieval where no shore unloading facilities are available. Most are diesel-hydraulic or electric-hydraulic
  4. Jib Crane: a jib crane is a type of crane where a horizontal member (jib or boom), supporting a moveable hoist, is fixed to a wall or to a floor-mounted pillar. Jib cranes are used in industrial premises and on military vehicles. The jib may swing through an arc, to give additional lateral movement, or be fixed. Similar cranes, often known simply as hoists, were fitted on the top floor of warehouse buildings to enable goods to be lifted to all floors.
  5. Bulk Cranes: Bulk-handling cranes are designed from the outset to carry a shell grab or bucket, rather than using a hook and a sling. They are used for bulk cargoes, such as coal, minerals, scrap metal etc.