‘Uncategorized’ Category

 

Long Span Cranes

Prefabricated metal buildings are increasingly moving towards widespan bays.  This requires overhead crane systems that have longer spans and heavier lifting capacities.  In addition, many considerations come in to play when designing and engineering long span crane systems in prefab buildings.  We have the knowledge and expertise to guide our clients towards the safest, most efficient solutions.

Here’s a glimpse in to one of our most recent jobs in a prefabricated metal building:

 

Special Considerations:

  • Overhead crane with span over 60 feet requires fabricated box girders
  • Long span cranes take up a large amount of the height in the building
  • Trucking and installation require special considerations and know-how

 

Our Team Approach:

  • Our team of engineers developed programs to design box girders for crane spans up to 110 feet
  • Our fabrication facility has the box girder weld tables and automated welding equipment to fabricate box girders to 110 feet
  • The Installation crew developed procedure and safety standards for handling long span box girder
  • Crane-Tec uses low head room trolley design to maximize building height

[Crane-Tec Runway Systems with spans up to 90 feet.]

 

Results

Cranetec has mastered the ability to engineer, fabricate, and install long span cranes at a very cost effective price.  We also do complete startup and testing of the installation for maximum efficiency and safety.

Check out some of the big ass cranes we’ve designed and installed!

 

 

Precision Needed For Railroad Engines

Crane-Tec was called upon to do a project for a Railroad Engine Maintenance Facility.  Our team of experts were asked to engineer, build and install a free-standing, 20-ton crane system in an existing facility.  This new setup would be used to service railroad engines.

 

Special Considerations:

  1. The customer’s application required precise movement and positioning
  2. Adding a freestanding runway system into an older, existing building.

 

Solution:

Working with the customer and general contractor requirements, Crane-Tec engineers designed a freestanding, 20-ton crane system.  We recommended variable speed control for the bridge, trolley and hoist.  We also added a true vertical lift hoist.

[Our engineers design to your specific needs.  That’s what sets us apart!]

Result:

Crane-Tec engineered, built, installed, and tested the complete 20-ton top running double girder, heavy duty, radio remote controlled crane and free standing runway system.

Below is a video with images for this recent project.  Enjoy!

 

Down with the OLD, Up with the NEW

 

 

 

The Challenge:

Remove two old 10 Ton Top running double girder cranes and replace them with two new 10 ton top running single girder cranes.

 

 

 

 

 

 

Special Considerations:

  • The New single girder cranes needed to have the same amount of lift as the old double girder cranes
  • New cranes could not have any painted surfaces that could chip or flake (Note: clean room environment)
  • Precise hook spotting required for accurate hood positioning

 

Our Team Approach:

  • Our team, armed with existing building dimensions, designed a stooled up single girder crane with a close headroom hoist to meet the lift requirements.
  • The hook and lower block of the hoist were disassembled, sand blasted, and reassembled.  The running surfaces on the bridge beam were kept bare metal.
  • A four light state of the art hook positioning system was installed on the hoist to indicate the exact lifting point

Result:
The old cranes were removed and the new cranes installed with little to no interference to the customer production time.

 

Plastic Parts Overhead Crane

The Challenge:

To provide our customer a plastics part manufacturer with a freestanding 10 ton crane system over existing plastic injection molding machines.

 

Special Consideration:

1)       Limited clear height in building.

2)      Spacing of machine limits location of freestanding runway columns.

3)      Delicate handling of dies.

 Our Team Approach:

Our project manager precisely measured the building and location of plastic injection molding machine.  We located the runway column between the existing machine; this required different lengths of runway beams.  The 10 ton single girder crane was supplied with a low head room hoist to overcome the low building height.  We recommended a two-step variable speed radio controlled crane for precise handling.   

Results:

The customer located a new machine in a different location.  During the installation, Crane-Tec relocated two columns at no addition cost to the customer. 

The customer is able to change large dies in the machine safely and quickly.

 

15 Ton Double Girder Cranes Ship to Nebraska

(2) 15 ton Top Running Double Girder Class D cranes shipped to Nebraska

 

Crane-Tec was recently contact by a steel fabricator in the Midwest to supply (2) 15 ton overhead crane in a new addition that was nearing completion.   The customer wanted the crane shipped in 6 weeks from contacting Crane-Tec.

 

We turned around pricing that day and were soon under contract to supply the cranes.  Crane-Tec was fortunate enough to have that chance to work with a local overhead crane service company to install, start-up and test the cranes.

 

The overhead cranes were equipped with hoist overload switches, bridge travel limit switched and remote operation.  The cranes were fabricated and shipped on-time to the customer ready to take off the truck set on the rails in his new addition.

 

12 Ton Single Girder Overhead Crane

12 ton Single Girder Overhead Crane

 

Crane-Tec was recently contacted to supply a 12 ton single girder crane and 300 feet of crane rail and crane electric for a Metal Wall Panel manufacturer in the Midwest.  The project consisted on (1) 12 ton top running single girder overhead crane and 300 feet of 40# crane rail and 4 bar electrification.

 

Crane-Tec worked with the General Contractor and Pre Engineered Metal Building supplier to determine the most practical and cost efficient design.  Crane-Tec crews installed the overhead crane, crane rail and 4 bar electrification in less than 3 days.  Crane-Tec technicians then arrived on-site to inspect the crane and install radio remote controls.

Crane-Tec utilized a low headroom design Shaw-Box World series 15 ton monorail hoist and had the hoist de-rated to a 12 ton capacity.  All controls are housed in a NEMA 4/12 enclosure and all wiring is plug-in.  The hoist incorporates triple reduction, helical, oil bath lubricated gearing in a cast aluminum gear case.  We had heard good things about the Shaw-Box hoist and after putting our hand on one and building a crane incorporating the hoist we know what we heard was true.  This is a well made piece of equipment utilizing the best components and engineering advances.

 

Another project and Overhead Crane that Crane-Tec can be proud of and stand behind.

 

20 ton Freestanding Overhead Crane System

20 ton Freestanding Overhead Crane System & 2 ton Freestanding Overhead Crane System

Crane-Tec was recently contracted to supply multiple overhead cranes and runway systems to a leading fabrication and engineering firm in Indiana.  The customer had purchased a spec building that wasn’t designed for overhead cranes and came to Crane-Tec for their overhead crane solution.  Crane-Tec worked with the customer and the General Contractor to designed a 20 ton free-standing runway system to accommodate (2) 10 ton 70+ foot span single box girder overhead cranes and multiple 2 ton jib cranes.

 

Crane-Tec worked closely with the customers General Contractor and assisted in the design of the necessary crane footers.  Crane-Tec engineers design and completely independent freestanding 20 ton overhead crane system that is capable of supporting 2 ton jib cranes.  Crane-Tec also designed and installed a 2 ton freestanding workstation crane that utilized 4 ton center bay columns so the owner can easily add a 2nd 2 ton system in the future.

 

All the crane and structural steel were installed successfully and on-time.  Electronic eyes were installed on the 10 ton cranes to keep them from touching and bridge travel limit switched were instated on the runway to reduce impact of cranes into the end-stops.

The customer’s facility is now up and running and the cranes have become an iatrical part of their fabrication process.

 

Safety instructions part 4

Safety Instructions for Finishing Work with the Hoist

  1. Raise the empty hook or loading device high enough to avoid it causing a hazard to traffic, but not to the top safety limit.
  2. Leave all the controls in the O- position
  3. Press the emergency stop button to open the main contractor.
  4. Turn off the safety switches for control current and main current.
  5. Close any mechanical brakes such as rail clamps, etc.
  6. Inform your foreman of any defects you have noticed.
  7. Inform  the next operator of all abnormalities in equipment operation you have noticed.

Safety Instructions for Servicing the Hoist

  1. Carry out regular inspections and preventative maintenance in compliance with the instructions. Keep a record of inspections and servicing. Regular servicing and inspection procedures are necessary for the safe and efficient operation of the hoist. In uncertain or unusual cases, contact the supplier of the hoist.
  2. Pay special attention to the operation of the brake and limit switches, and to the condition of the hook, rope and pushbutton controller. It is essential that safety devices (overload protectors, limit switches, etc.) work correctly and are in full operating order because they safeguard against human error.
  3. Use trained servicing personnel authorized by the manufacturer of the hoist for servicing the hoist. The person servicing the hoist must be competent for the task and must be familiar with the servicing and inspection instructions.
  4. Use only genuine spare parts approved by the manufacturer of the hoist.
  5. Any modifications or additions made to the hoist’s structures or performance values must first be discussed with the supplier of the hoist.
  6. Any inspections and repair operations carried out on the hoist after an overload or collision must be discussed with the supplier of the hoist.

 

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  • Comments Off on Part 3. Lifting the Load- Things that you do not want to do

Part 3. Lifting the Load- Things that you do not want to do

  1. Do not lift people on the hook or load. Lifting people with a hoist is prohibited unless the hoist is designed and manufactured for that purpose(this must always be agreed with the supplier of the hoist).  Do not go under the hook or a load. Do not move the hook or load over a person. A load must never be lifted in a way that can injure a person if the load drops.Do not operate the hoist if you know that medication, an illness, or other such handicap impairs your alertness or working ability.
  2.  Do not lift a load that is fastened to its base or that is heavier than the maximum permissible load for the hoist or lifting accessories. A jerking or static load can cause an overload. A hoist may only be used for those loads and load combinations, and at those speeds, for which the hoist has been designed and manufactured.  Raise the load high enough to prevent it from hitting objects during travel. However, do not raise it higher than is necessary for the situation. Do not raise the hook to the top safety limit.
  3. During hoisting and travel motion, ensure that the hook, the load, and the crane and its moving parts do not collide with objects or people.  If the hoist is provided with a horn, sound the horn when you move the load in the vicinity of people who are not paying attention to the moving load.  Do not move the load until you have received a signal from the person attaching the load to the hook or lifting appliance.  Do not use the overload protection for weighing the load.
  4. Stop all hoisting and travel motions before the safety limit switches.  Do not adjust or bypass the limit switches or warning devices in order to go past motion limits. Do not use the hoist if the limit switches are inoperative.  If the manually-adjusted backup limit switch in the hoist has triggered, call a serviceman to the hoist and ask him to determine why the normal safety limit switch did not function.  Do not use the hoisting rope as a lifting lug.
  5. Do not use the hoist if there are visible defects in; or damage to, the hoist, the hoisting rope, or any other hoist structure or hoist function. Stop operating the hoist if it operates abnormally (for example, a high noise level, uneven starting, or malfunctions).Using faulty equipment is strictly prohibited.  If defects have been noticed in the hoist, carry out the necessary inspections and servicing. Ensure that the hoist operates properly before you start to use it again.  Do not use the limit switches to stop the motions of the hoist. Hoist motions must be stopped with the pushbutton controller or other control device intended for the purpose.
  6. Use the proper pushbuttons intended for controlling the hoist. If you feel you are losing control of the hoist motions, press the emergency stop button. In a potentially dangerous situation all hoist motions can be stopped by pressing the emergency stop button, but do not use the emergency stop function unnecessarily. Ensure that it is safe to re-commence working after the emergency stop button has been pressed.  Avoid short, jerky motions. Unnecessary short starts can cause the hoisting motor to overheat quickly. The last controller step is for normal drive. The intermediate steps are normally used for short durations only. Do not switch the controller back and forth unnecessarily because it causes wear. Avoid violent collisions into other hoists or against the buffers.
  • Do not leave a suspended load unattended.
  • Do not lower the hook so far that the ropes become slack.
  • Do not pull a load from the side. Lower the load with the ropes perpendicular.
  • Do not use hoist motions to remove the load from the hook.
  • Do not weld on a hook that is not isolated. Do not fasten a welding electrode to the hoisting rope.
  • Do not change the size of fuses. A qualified electrician should carry out all electrical work.

 

Part 2 Lifting the Load

In order to get the maximum lifetime out of a hoist, you want to be sure that you are using it correctly. Using the hoist for projects out of the hoist group classification for which it was designed changes the lifetime of the product.  Before hoisting a load, be sure to determine a safe and effective path for it to travel to ensure that the load will not collide against objects or people. Also,  check that no servicemen or unauthorized persons are on the crane and that the rails and power cables are clear of obstructing objects.  Before hoisting, check that the hoisting devices are securely positioned on the bearing surface of the hook and that the safety catch on the hook is closed.

Next, you want to ensure that the load’s mass center is on the center line of the hook forging so that the load does not bend the hook neck.  Make sure that the force is applied only to the hook’s bearing surface (the lowest point of the hook) because if  force is applied to other parts of the hook it will cause undesired stresses.  Forces on ramshorn hooks have to be equal on both bearing surfaces.  Before hoisting, check that the load is balanced and safely fastened at the lifting points and also be sure that the load cannot slide, slip or detach itself when suspended.

In addition, you need to confirm that the ropes are perpendicular and that the hoist is positioned perpendicularly above the load to be lifted.  A load must not be hoisted or dragged along the ground in a way that causes side pull on the roping unless the hoist is designed and manufactured for this purpose.  When using a lifting accessory (sling, belt, etc.), always follow the instructions provided by the lifting accessory manufacturer. Finally, if two cranes are needed to handle a load, a balancing beam must be used to equalize the loading.  Combined hoisting with two cranes must be supervised by a foreman knowledgeable about cranes or by a crane specialist who is in charge of the lifting operation.