Practical Guide to Accommodation Ladder (Part 1)

At the dock where the ship is moored, the accommodation ladder lies quietly, one end firmly resting on the vessel and the other extending onto land. Though it may seem unremarkable at first glance, this humble structure plays an absolutely critical role. As the vital link between the ship and the shore, the acc. ladder is the essential passage for crew members, dockworkers, pilots, and others to move back and forth. It’s also a crucial channel for loading and unloading cargo—and even more importantly, it serves as a bridge of communication between the ship and the outside world. Every time personnel embark or disembark, and every time goods are loaded or unloaded, the safety and stability of the acc. ladder are absolutely indispensable. Should the acc. ladder malfunction, it would be like a bridge collapsing—resulting not only in halted operations but also posing a grave threat to the safety of human life. Therefore, proper use and regular maintenance of the acc. ladder are key to ensuring smooth ship operations and safeguarding the safety of all personnel.

I.Types and Construction of Accommodation Ladder

In the world of shipping, there are various types of acc. ladders, with the most common being the rotating-platform type and the fixed-platform type. The rotating-platform acc. ladder is like a nimble dancer: its single-section, multi-section, or telescopic ladder body is hinged to a rotating platform above, enabling it to freely adjust its direction and inclination angle between the ship and the landing surface, easily adapting to a wide range of complex docking conditions. It can be securely suspended from a lower point by steel cables or chains, or it can be firmly supported by rollers fixed at the base of the acc. ladder. On some large passenger ships, for instance, the rotating-platform acc. ladder can pivot flexibly, making it convenient for passengers to board and disembark. In contrast, the fixed-platform acc. ladder acts as a steady guardian: its single-section, multi-section, or telescopic ladder body is also hinged to a fixed platform above. Although it can only adjust its inclination angle between the ship and the landing surface, it excels in structural stability and reliability. Pilot acc. ladders, used exclusively by pilots, often adopt this fixed-platform design to ensure their safe entry and exit from the ship. Regardless of the type, the basic structure of a acc. ladder mainly consists of two key components: the acc. ladder body and the acc. ladder lifting, tilting, and fixing mechanism. The ladder body serves as the walking passage and comprises components and accessories such as the ladder frame, treads, tread transmission rods, upper platform, lower platform, railing handrails, guard rails, lateral rollers, lower rollers, and pivot pins. The treads provide the stepping points for passengers going up and down, while the transmission rods act as coordinators, keeping the treads and lower platform level even when the acc. ladder’s angle changes, ensuring smoother walking. The upper and lower platforms serve as transition zones, and the railing handrails and guard rails act as safety guardians, preventing people from falling. Lateral rollers and lower rollers reduce friction, allowing the acc. ladder to move more smoothly.

The acc. ladder lifting, tilting, and securing device is the “unsung hero” behind the acc. ladder. It consists of a hoisting cable, rollers, cross beams, lifting arms, transmission tubes, supports, eye plates, and associated axle pins, shackles, and locking hooks. These components work together to enable the acc. ladder to be raised, tilted, and securely fixed, ensuring that it remains stable and reliable during use and can be safely retracted when not in use. When the ship docks, this device allows the acc. ladder to be precisely positioned in the correct location; while the ship is underway, it ensures that the acc. ladder is firmly retracted and securely fastened along the side of the deck.

II. Key Points for Installation and Arrangement

(1) Preparations before installation

Before installing the acc. ladder, a series of meticulous preparatory steps is indispensable. It is crucial to conduct a thorough inspection of the equipment’s integrity, checking for any deformation or damage to the acc. ladder structure, ensuring that the treads are securely fastened, the handrails are intact, and all components of the lifting, rotating, and securing mechanisms are complete and functioning properly. Even the slightest missing or damaged part could lead to significant problems during subsequent use. For example, if a tread becomes loose, personnel could easily misstep and fall while walking; if the handrail is damaged, it will fail to provide effective protection for users. At the same time, it is essential to confirm the installation location precisely. Based on the ship’s type, intended use, and layout, as well as the conditions of the pier or other vessels, the exact installation position of the acc. ladder must be determined to ensure that, when deployed, it can smoothly connect to the pier or another vessel, accommodating varying height differences and distance adjustments. In addition, it is critical to prepare all the necessary tools and materials for installation. Tools such as wrenches, screwdrivers, electric welders, and measuring tapes should be fully stocked. Fasteners like bolts, nuts, and washers, as well as protective materials such as anti-rust paint, must also be readily available in sufficient quantities. Moreover, the specifications of the bolts and nuts must perfectly match the mounting holes on both the acc. ladder and the ship’s side, and their strength must be adequate to withstand the loads experienced during the acc. ladder’s operation.

(2) Correct installation steps

When lifting the acc. ladder, it is essential to use appropriate lifting equipment—such as professional hoisting devices—to lift the acc. ladder smoothly from its center. As the slings pass through the acc. ladder, they should be positioned as close as possible to the railing brackets, thereby preventing the slings from squeezing and deforming the handrails when under tension. Next, unscrew the bolts on the upper eye plate of the ladder frame, carefully maneuver the lifting gear to precisely insert the upper eye plate of the acc. ladder into the double eye plates on the upper platform. Then, reattach the bolts and secure the nuts with cotter pins, completing the initial connection between the ladder frame and the upper platform. During the positioning process, slowly move the acc. ladder according to the pre-determined installation location, ensuring that it aligns accurate position precisely. At the same time, use adjustment devices—such as adjustable support feet or telescopic mechanisms—to finely adjust the height and angle of the acc. ladder, ensuring a snug and stable connection between the ship and the dock. Finally, secure the acc. ladder firmly to the ship by either welding or bolting. If welding is used, first clean the installation area on the ship’s side, removing rust, oil stains, and other impurities. Then, follow the prescribed welding procedures to ensure a strong weld. If bolts are used, tighten them securely and apply anti-loosening measures, such as installing spring washers, to prevent the bolts from loosening due to ship vibrations or during acc. ladder use.

(3)Safety Requirements for Arrangement

When arranging the gangway, it must be kept away from hazardous areas. For instance, it should be positioned away from cargo handling zones to prevent personnel on the gangway from being struck by falling cargo. It should also be kept clear of ship scuppers (drainage outlets) to avoid water discharge impacting the stability of the gangway.

Installing protective facilities is also essential. Guardrails must be installed on both sides of the gangway. Their height should comply with safety standards, typically between 90 and 110 cm, with reasonable spacing between the rails to prevent personnel from slipping off the sides. Anti-slip patterns should be set on the tread surface, or anti-slip rubber mats should be pasted to increase friction and prevent slipping. If there is water beneath the gangway, a safety net must be rigged. It should extend from the ship's railing all the way to the wharf, fully covering the area from the upper platform to the lower platform, providing dual protection for personnel.