Marine Anchor

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The Method of Anchoring Marine Anchor

Anchoring from the bow of the ship

There are two types of ship’s bow anchored: single anchor and double anchor. Under normal circumstances, a single anchor can be used to fasten the ship, and only double anchors can be thrown when the wind and waves are particularly strong and the anchorage is narrow. When anchoring from the bow of the ship, the hull receives the least external forces such as wind force, current force and wave impact force, so this method is the main method of anchoring and mooring, and it is also the main reason why the main anchor is arranged in the bow of the ship.

Anchoring from the stern of the ship

Anchoring from the stern is mostly used for inland watercraft and landing craft. When the inland river vessel sails downstream and anchors downstream, in order to ensure safety and avoid turning around, the stern anchor is often used. In the operation of landing ships and retreating from the beach, with the cooperation of the main engine, the ship on the beach was pulled down the beach by the pulling force of the windlass.

Anchoring from the ship side

When the ship is in a berthing condition where the water flow or wind direction is perpendicular to the centerline or at a certain angle, anchoring from the ship side can facilitate ventilation and disinfection or enable the ship to load and unload cargo on the leeward side, or perform other operations.

Anchoring from the bow and stern

If you want to make the anchored ship always use the ship’s side and face the wind direction, then use the method of anchoring bow and stern. This method is generally to throw the main anchor from the direction of the wind, from the stern, pass a cable around the outboard of the ship and connect it with the thrown-out main anchor chain, and then release some main anchor chains.

Precautions for Using Marine Anchors

For anchors to work, the most basic condition is to hook things on the bottom of the sea. If the anchor chain is not long enough, the anchor will not work. If the seabed is flat, or the thing the anchor is hooked on is not fixed, or the hook is not very strong, if it is calm and the sea is still okay, once the waves are too large, the anchor can’t catch things and the anchor will lose its function. This is called anchoring. It is very dangerous when the ship is anchored, because the main engine usually stops when the ship is anchored. If the ship is started immediately, it takes time, and it is very dangerous for a ship without power to drift around. . Therefore, the concept of anchorages came into being. Anchorages meant that the bottom of the sea was relatively rough. In addition, they had to be sheltered from the wind.

Anchor chain is the part that guarantees that the ship can stand still on the water surface. If the ship wants to stand still in the current, it must rely on the anchor in the water to hold ship. Weight, so there are rules for how big a ship is and how big an anchor is. This is due to the holding force that the anchor can produce and its own inertial force, and the friction force of the anchor chain also plays a certain role.

Looking from the top of the ship, the anchor chain is straight, but there is a section of it under water that is close to the seabed (in fact, it is close to the seabed). The anchor provides the holding force, which is then transmitted to the ship through the anchor chain, thereby resisting the influence of the external load of the sea current and wind and waves on the positioning. The reason why there is a section close to the bottom of the sea is to take into account the influence of the force. Think about it, an anchor, the anchor chain is easy to move when pulled straight; and there is a section close to the bottom of the sea, which can provide a margin, which is possible within a certain range.