What is meant by shear legs?

What is meant by shear legs?

Shear legs, also known as sheers, shears, or sheer legs, are a form of two-legged lifting device. Shear legs may be permanent, formed of a solid A-frame and supports, as commonly seen on land and the floating sheerleg, or temporary, as aboard a vessel lacking a fixed crane or derrick.

How does a floating crane work?

Cranes are stabilized in changing aquatic conditions by pumping river water into compartments called ballast tanks. By weighing down and lowering a crane’s center of gravity, the filled tanks enable the crane to safely and efficiently lift large objects over water.

What are crane legs called?

The outriggers are comprised of the beam, which is the leg of the outrigger, and the pad, which is the foot. Sometimes, “floats” are placed under the pad to dissipate the force of the crane and the load over concrete or pavement.

What is a crane barge used for?

Crane Barge: Often referred to as a crane vessel or crane ship, these vessels are commonly used in offshore construction. These are ships with cranes that can help with heavy lifting. Dry Bulk Cargo Barge: These barges are typically used to carry dry goods, ranging from coal, grain, and sand to finished steel.

What is a crane outrigger called?

Outriggers (sometimes called Stabilizers) are retractable hydraulic `legs’ that extend, like a spider’s legs, away from the truck before they make contact with the ground. Hydraulic outriggers commonly come in two shapes.

What is a rooster sheave?

The rooster sheave is a pin-on rigging accessory with a composite sheave identical to the boom tip sheaves. It is required if rigging more than six parts of line, or when an auxiliary winch is used.

What is a spud on a barge?

The barge is moored by steel shafts or through-deck piling, which are essentially pipes driven right into the soil or sand at the bottom of the water to provide stability. These are often referred to as ‘spuds,’ giving this barge its distinct name.

What is a derrick barge?

Fully revolving derrick barges are the traditional barge used in constructing a new platform or to perform a major modification to a platform. It is very costly, but is capable of carrying out a huge amount of work. As with the sheer-legs crane barges, they are fitted with deck engines and full mooring capability.

What is a headache ball?

Headache Balls, also known as overhaul hook balls, are very important devices used in a single line hoist wire rope with the purpose to add weight and help the line to drop down after coming up the crane boom and going over the sheave.

What does dog mean in rigging?

Magnet is Disconnected! Dog Everything: Clasp hands in front of the body. Means PAUSE. This signal can be used on potentially risky occasions such as when it has started raining, when the load doesn’t fit the space for which it was planned, or when a bystander gets too close to the action.

What is an ABS barge?

The ABS classifies tank barges in the following types: Oil Tank Barge – This type of barge carries petroleum products with a flash point below 60°C. Fuel Oil Tank Barge – This type of barge carries petroleum products with a flash point above 60°C.

What is the difference between a crane and a derrick?

Cranes whether fixed or mobile are driven manually or by power. A “derrick” is an apparatus consisting of a mast or equivalent member held at the head by guys or braces, with or without a boom, for use with a hoisting mechanism and operating ropes. OSHA often refers to these two lifting machines together.

What is a pipelay crane vessel?

The term “pipelaying vessel” or “pipelayer” refers to all vessels capable of laying pipe on the ocean floor. It can also refer to “dual activity” ships. These vessels are capable of laying pipe on the ocean floor in addition to their primary job.

What is a rake barge?

A rake barge has a curved bow to provide less resistance when being pushed and is usually placed at the head of the tow. A box barge is usually placed in the center and rear of the tow and can hold more cargo.

What is a overhaul ball?

Overhaul balls are used to add weight to a crane rope so that the crane lines are kept taught. This prevents spooling and twisting issues that would ultimately create permanent damage the crane. These overhaul balls vary in size and design depending on the crane truck or shop environment in which it’s being used.

What is the overhaul ball used for?

Heavy steel ball used to provide ballast on the hook end of a crane hoist rope. Overhaul balls supply the downhaul weight necessary to counter bearing friction and winch-to-boom-tip line weight. It can also be used in lieu of a winch.

What does doggin slang mean?

noun. British slang the practice of carrying out or watching sexual activities in semi-secluded locations such as parks or car parks, often arranged by e-mail or text messages.