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Rigging Terminology

Last week we discussed different types of cranes and focused on hydraulic cranes. At Lee, we specialize in using our portable gantry cranes to move machinery and equipment. So how does a gantry crane system differ from a mobile crane?

A gantry crane is a type of overhead crane supported by freestanding legs that move on wheels or along a track or rail system. Gantry cranes are usually considered when there is a reason not to incorporate an overhead runway system. Unlike a bridge crane, a gantry crane does not need to be tied into a building’s support structure—eliminating the need for permanent runway beams and support columns. In some cases, this can result in a significant reduction in material costs and can be a more cost-effective solution compared to a similarly specified bridge crane. Larger gantry systems may run on a rail or track embedded in the ground, typically in a straight line in a dedicated work area. Smaller portable gantry systems run on castors or wheels and can be moved about a facility for maintenance or light fabrication work.

Rigging Terms

  • Portable Gantry Crane System – Portable gantry cranes are smaller lighter-duty gantry systems that run on casters or rubber wheels. These wheels allow the user to move it throughout a facility to handle various materials or loads. When they’re empty and not under load, they can be moved or stored anywhere throughout a shop or into different work cells to offer greater space-saving and floor space flexibility.
  • Semi-Gantry Crane System – Gantry cranes can also be designed with one leg riding on wheels or rails and the other side of the crane riding on a runway system connected to building columns or a sidewall of the building structure. These are advantageous because they can save you floor space / workspace. Unlike a bridge crane, this setup doesn’t need two runways supported by or tied back to building columns.
  • Shackle – A type of device normally used for lifting.
  • Sling – Wire ropes, chains, or synthetic fabric made into forms, with or without fittings, for handling loads.
  • Tag Line – A length of rope used to guide a load that is being lifted into the desired position.
  • Rigging Hook – A hook used as part of tackle. Any hook used in hoisting and rigging that is not the “primary hook” or main “load hook.”

Lee Contracting In-House Cranes

Lee Contracting’s in-house equipment includes cranes with capacities up to 300 tons and gantries with capacities up to 1,200 tons. We can complete your industrial project no matter the size or complexity. Not only can we complete any of your crane needs, we provide full turn-key solutions to assist with shutdown, start-up, hookups, maintenance and more.

Receive your free quote today or call us today at (888) 833-8776 to learn how we can complete your next industrial project.

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History of Cranes

For thousands of years, people have innovated ways to lift heavy objects and place them where they’re needed. As demonstrated at Stonehenge, the Pyramids of Giza, and countless ancient sites around the world, the history of the crane is closely aligned with the history of the limits of man’s strength. Ancient Greeks were miles ahead of the rest of the world when using lifting equipment. As early as 515 BC, distinctive cuttings for lifting tongs and lewis irons were discovered on stone blocks of Greek temples. These were the first blueprints for our modern cranes.

The History of The Crane

The concept of cranes originated from pulley systems that were first utilized by ancient Mesopotamians as early as 1500 BC. The first compound pulleys were created by Archimedes of Syracuse around 287 – 212 BC, which he used to lift an entire warship, along with its crew. A compound pulley has many advantages and pitfalls. A compound pulley system with five pulleys has a 5:1 advantage, meaning a man exerting a force of 50lbs, can pull 250lbs. The pitfalls include being stationary, immobile and have slow lifting speeds. These pitfalls led to the development of the winches and capstans used by the Romans to build temples. The power of circular rotation caught on quickly, which naturally led to the increased use of gear works and the development of cranes.

History of Cranes

The earliest treadwheel appears in 1225. In the seas, the earliest harbor cranes were in use in 1244 in Utrecht while in England the treadwheel was recorded in 1331. At this time, cranes were used in harbors, mines and in building sites where the treadwheel crane had a major lifting role. The cranes were powered by windlasses that had radiating spokes and cranks. A single man operating a treadwheel crane has a mechanical advantage of 30:1. Treadwheel cranes were in use until the end of the 17th century and were essential at harbors and in cathedral construction.

The History of The Hydraulic Crane

While cranes remained hand-powered for centuries, hydraulic technology was developing. With a history that stretches back to Ancient Egypt, China, and Greece, water-powered machines (mostly water wheels) had been in use for thousands of years. Ancient irrigation systems, like the aqueducts developed by the Romans, relied on simple hydraulic technology, like siphoning.

But it was not until the 15th century that Blaise Pascal studied fluid hydrodynamics and hydrostatics, creating a new understanding of hydraulic principles like fluid density, pressure and incompressibility. He invented the hydraulic press which is the building block of modern hydraulics.

Much later in the 19th century, the rise of ironworks and industrialization meant that cranes were finally made with iron. The first cast iron crane was constructed in 1834. And in 1851, hand-powered cranes finally began running on steam power — the first step toward a truly hydraulic crane.

Modern Hydraulic Cranes

History of Cranes

Today, hydraulic cranes are built with better specifications and materials than cranes in the 1800s but rely on the same mechanical and hydraulic principles developed centuries ago.

Modern hydraulic cranes are filled with an incompressible fluid, usually oil, that perfectly transfers pressure between pistons. Variations on this simple leveraging of fluid movement have allowed us to engineer large capacity cranes.

The Future of Cranes

In modern day, some mobile hydraulic cranes have a load capacity of up to 1,200 tons with a boom extending to 328 feet. While stationary cranes can have a much larger capacity, a mobile crane is beneficial for temporary construction. But what does the future of cranes look like? Certain companies are now developing remote monitoring and support. For remote monitoring, sensors are placed on the crane to collect data including running time, motor starts, work cycle and emergency stops. Remote support includes specialists ready to provide problem-solving and troubleshooting to reduce unexpected downtime.

Lee Contracting’s in-house equipment includes cranes with capacities up to 300 tons and gantries with capacities up to 1,200 tons.

Receive your free quote today or call us today at (888) 833-8776 to learn how we can complete your next industrial project.

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Riggers in Michigan

Not all machinery movers are the same. Many companies cannot provide turn-key services like Lee Contracting. Hiring professional riggers will provide high-quality results. Hiring local riggers will help cut your costs and your downtime.

Benefits of Hiring a Local Company

Hiring a Michigan based rigging company provides many benefits to your company and your project. As a local machinery mover, we will meet with you on site to walk a job, better understand the layout, understand job site conditions and avoid obstacles ahead of time. Our safety team is always ready to review job site conditions and ensure that safety is the top priority. We comply with all OSHA and MIOSHA standards. This unified approach helps our rigging team provide the best and most efficient scope of work to complete the project.

Our turn-key solutions cut down time and cost. As a local company, our travel and equipment costs are minimized. Another benefit to hiring a local machinery mover is our 24/7, 365 availability. Our availability paired with our world-class customer service makes Lee Contracting your contractor of choice.

In-House Experience

  • Stamping Presses
  • IMM and BMM
  • Weld Cells
  • Robotic Cells
  • Assembly Lines
  • Machining Equipment
  • Structural Steel
  • Layout and aligning
  • Equipment rebuilds
  • HVAC Systems
  • Overhead Crane Installation

rigging departmentLee Contracting’s rigging department is made of the best riggers in the industry. With almost 30 years of experience, we like to be tested beyond our limits. We work to ensure that every project is safe and efficient. We are available 24/7, 365 days a year and complete every project with state-of-the-art equipment.

Call us today at (888) 833-8776 or receive a free quote online for your next rigging project.

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Hiring an Industrial Rigger

Industrial rigging is an important part of the moving process. It can be one of the most dangerous phases of any large-scale commercial construction project. Professional riggers are needed to safely lift and move unusual objects which can be heavy and oversized.

Using a combination of equipment, riggers frequently relocate items such as:

  • Stamping Presses
  • IMM and BMM
  • Weld Cells
  • Robotic Cells
  • Assembly Lines
  • Machining Equipment
  • Structural Steel
  • Layout and aligning
  • Equipment rebuild
  • HVAC Systems

The best rigging team understands the equipment being used, the full scope of the project and proper safety practices. Below are some things to consider when looking to hire a rigging contractor.

Industrial Rigger

Not all rigging companies are the same

When choosing a rigging contractor, it is important to consult with an experienced rigging company. Though all rigging companies may claim they can handle your equipment, each company will have different machinery, load capacities, manpower and reputation. Lee Contracting operates 24/7, 365 days a year with state-of-the-art equipment which ensures we are ready to tackle any project.

Do they have the experience to do the job?

Riggers use complex moving techniques and important safeguards to relocate items. Your contractor should have surveyors, estimators, supervisors, engineers and operators to handle the full scope of your needs. Lee Contracting has almost 30 years of experience handling our customers important manufacturing equipment.

Are they committed to performing the work safely?

When moving items that weigh thousands of pounds, the riggers must be very familiar with the safety requirements needed to keep people and surrounding structures safe from falling objects. Lee Contracting complies with all OSHA standards and obtains all the necessary permits and insurance documentation to complete the job.

 

Find a rigging contractor who can do it all

There are many companies out there who provide only one service, such as rigging. Lee Contracting, however, provides a wide range of service to ensure that the installation of your new equipment goes smoothly. We offer foundations, rigging, electrical and mechanical services on every project as well as our other supporting trades: fabrication, maintenance & repair, controls & robotics, building, roof raising, emergency power and industrial storage.

Offering a wide range of trades, we can ensure that you have an efficient, cost-effective equipment installation.

Call today to receive a free RFQ on your next rigging project, 888-833-8776.