What is a top running crane runway?
A top running crane runway is likely the most common form of overhead crane used in manufacturing and transportation. Top running crane runways include a stationary rail mounted to each runway beam. End trucks use this rail to transport the bridge and hoist along the crane runway.
How are Crane runways made?
for top-mounted crane only ! The construction of crane runways can be achieved by attachment to the main frames of the buiding or by mounting on independent columns. For top-mounted crane, they are made of two longitudinal beams (I-shape or box-shape) on which are fixed the rails where the wheels of the crane circulate.
How do you measure the length of a crane runway?
The length of the runway is the total overall distance that the crane will move through the facility. Measure out this rough length using the building’s specifications, the setup of your existing production area, or map out or mark off an area you want to be able to utilize for material handling and load movement.
What is the maximum eccentricity of cranes on a runway?
Crane rails shall be centered on the centerline of the runway girders. The maximum eccentricity of the center of the rail to the centerline of the girder shall be three-quarters of the girder web thickness. See illustration to the right side.
How are crane runways made?
What are variable crane actions?
What causes variable vertical crane actions?
What section of crane bridge is manufactured?
What is the vertical deflection of a runway beam?
What are the components of a crane runway system?
A top running crane runway consists of (3) components, the columns, the runway beams and the crane rail. An underhung system consists of runway beams that are supported from above by the building.
What is runway beam?
A simple lifting solution within a building or structure is a runway beam. This allows a trolley to move freely along the length of the beam, moving a load from one end to the other. We can help you by designing, manufacturing and installing a runway beam to suit your requirements.
What is a crane bay?
The following is a glossary of terms related to overhead cranes: BAY: The space between the building frames measured parallel to the ridge of the building. Brake: A device for retarding or, stopping motion by friction or by power means.
What is span of crane?
The crane span is the measured center-to-center distance between the runway beams. One of the most important measurements you can provide during an overhead crane consultation is the crane's span.
What is a runway track?
The straight length of track along which a competitor sprints toward the takeoff board. The runway is level and at least 44yd long, although there is no maximum length.
What is a monorail crane?
A monorail crane system is a stationary, overhead track on which trolleys travel to carry loads from one place to another in a facility. Monorail cranes are an ideal solution for linear, overhead material handling due to the fact that they enhance production workflow and create a safe and secure work environment.
What is bay length in EOT crane?
Scope: Design, manufacture, Erection, Commissioning, Trial run and supply of 3 TON capacity electrically operated overhead travelling crane conforming to IS: 807, 3177 & 3938 tested to 25% overload with a span 18 meters, Lift 7.5 meters and bay length 28 meters and as per the detailed specifications in the annexure.
What is CT and LT in crane?
LT motion : Long Travel Motion. CT motion : Cross Travel Motion. Bridge : the structural portion on which the trolley/crab moves. LT End carriage : Structure which houses Long Travel Wheels. CT End carriage : Structure which houses Cross Travel Wheels.
What is the hook on a crane called?
Anchor Bolt - A bolt used with its head embedded in masonry or concrete and its threaded part protruding to hold a jib crane in place.
What is crane hook height?
The hook height represents the required dimensions from the crane hook to the floor when the crane hook is at its highest position. This vital measurement determines how high the runway must be from the floor and directly related to the clear interior height of the building or structure.
What is a beam approach in aviation?
A blind approach beacon system or beam approach beacon system (BABS) is an automatic radar landing system developed in the early 1940s. It is a responder (or transponder) mounted in a Hillman van and placed at the end of the runway.
What are the types of runways?
The three classifications of runways are Visual Runways, Nonprecision Instrument Runways, and Precision Instrument Runways.
What is another word for runway?
field, strip, airstrip, flight strip, landing strip, landing field, flying field, airfield.
How do runway lights work?
The lights marking the ends of the runway emit red light toward the runway to indicate the end of runway to a departing aircraft and emit green outward from the runway end to indicate the threshold to landing aircraft.
Eurocode verification of a runway beam subject to wheel loads – Part 1
NSC 25 February 2015 1. ULTIMATE LIMIT STATE At the ultimate limit state (ULS), runway beams must be verified for bending due to vertical loads in combination with the effect
DESIGN OF CRANE RUNWAY STRUCTURES - McMaster University
MASTER OF ENGINEERING (1980) (Civil Engineering) McMASTER UNIVERSITY Hamilton, Ontario TITLE: Practical Design and Detailing Approach for Crane Runway
EN 1993-6: Eurocode 3: Design of steel structures - Part 6: Crane ... - PhD
EUROPEAN STANDARD NORME EUROPEENNE EUROpAISCHE NORM EN 1993-6 April 2007 ICS 53.020.20; 91.010.30; 91.080.10 Supersedes ENV 1993-6:1999 Incorporating corrigendum July 2009
What is a top running crane?
Top running crane runway systems are typically used for top running single girder cranes along with top running double girder cranes. Additionally, some specialty crane systems are also designed to utilize a top running runway system. Generally, this runway style typically uses ASCE Rail or square bar that is affixed to the top of a structural beam as a running surface for the top running crane. There are multiple support options for top running crane runway systems. Being supported from a hauch (which is attached to a side of a building column) or utilizing a freestanding structure are the most common ways of supporting a top running crane runways.
What is freestanding runway?
A freestanding structure is floor supported and can be designed to fit virtually anywhere. These systems can be designed for top running and under hung runways along with monorail and enclosed track systems. Freestanding structural steel systems are often used if the building structure cannot support the additional load of the crane. These freestanding systems are designed without the use of any bracing. Freestanding systems can also be designed with column bracing which is braced back to the floor (knee braced structure) or with bracing that tie back to the building structure (semi-freestanding structure). Both the knee braced runway and semi-freestanding runway reduce the amount of steel being used making it a more cost effective system. In most freestanding structures, concrete footings may need to be installed to take the weight of the system.
What is AFE crane?
AFE Crane can design, engineer and fabricate custom crane runway systems and supporting structural steel to fit every customers needs. AFE Crane is also able to have our runway and structural system stamped by a Professional Engineer licensed by the National Society of Professional Engineers.
Is a knee braced runway more cost effective than a semi freestanding runway?
Both the knee braced runway and semi-freestanding runway reduce the amount of steel being used making it a more cost effective system. In most freestanding structures, concrete footings may need to be installed to take the weight of the system.
Can you use a runway beam on an under hung crane?
Additionally, most specialty crane systems can also utilize an under hung runway. Unlike top running runways, under hung runway beams typically use patented track as a running surface. Alternatively, structural I-beams can also be used as a running surface. AFE Crane suggests to all customers to use patented track as opposed to structural I-beams ...
What does a crane runway look like?
I know why people look upon the crane runway as part of the Building and not part of the crane. Runways look like building steel, they're made with building steel, they're fabricated by building steel fabricators, and more often than not, they're installed by building steel erectors.
Why should crane runway fabrication and erection tolerances be addressed in the project specifications?
Crane runway fabrication and erection tolerances should be addressed in the project specifications because standard tolerances used in steel frameworks for buildings are not tight enough for buildings with cranes. Also, some of the required tolerances are not addressed in standard specifications.
How much vertical misalignment of crane rails from straight?
The vertical longitudinal misalignment of crane rails from straight shall not exceed ± 1⁄4 inch in 50 measured at the column center lines with a maximum of ± 1⁄2 inch total deviation in the length of the runway.
What is the horizontal distance between crane rails?
The horizontal distance between crane rails shall not exceed the theoretical dimension by ± 1⁄4 inch measured at 68 °F.
Where should crane rails be centered?
Crane rails shall be centered on the centerline of the runway girders. The maximum eccentricity of the center of the rail to the centerline of the girder shall be three-quarters of the girder web thickness. See illustration to the right side.
How long does it take for a bad runway to chew up?
By the same token, it can safely be said that bad runway design and alignment can chew up runway rail and crane wheels in less than a year. Further, if your runways are out of alignment your crane builder will refuse to honor their warranty, and justifiable so.
What is runway length?
The length of the runway is the total overall distance that the crane will move through the facility. Measure out this rough length using the building’s specifications, the setup of your existing production area, or map out or mark off an area you want to be able to utilize for material handling and load movement.
What obstructions can a crane be near?
Make sure you understand how close your crane will be to overhead obstructions like AC/furnace ducts, electrical and gas lines, water pipes, light fixtures, and building headers.
How to measure the distance of a runway?
If your building already has a runway system in place, you can use your laser pointer and place it flush with the runway or building support that the runway is resting on and measure across to the next beam or support. You’ll want to make note of any cantilevers or haunches that the runway beam may be sitting on to determine how far off the building column the center line of the runway is.
What is overhead crane classification?
Overhead crane classifications are based on usage of the crane, how hard the crane will have to work, and the type of environment that the crane will be working in.
What are the measurements of a crane rail?
The two most important measurements for the crane rails are the head width and the rail height . This allows the engineering team to identify the size of the rail and determine what size wheels should be used on the crane system. This is important for two reasons:
What is crane span?
The crane span is the measured center-to-center distance between the runway beams.
How to get closer to runway beams?
Ideally, you will have access to get closer to the runway beams using a lift or nearby mezzanine (if available). If not, you can gather a lot of these measurements using your tape measure or your laser pointer.
How many metrics are there for crane runways?
The Crane Manufacturers Association of America’s (CMAA’s) specification #70 has eight different metrics for evaluating crane runways. These metrics are as follows:
Why is it important to have a crane properly aligned?
A properly aligned crane is imperative to meet the performance requirements outlined by industry standards, and poor alignment can cause a chain reaction of issues, ultimately resulting in unnecessary wear-and-tear and unplanned downtime.
What is the maximum eccentricity of the center to rail to centerline of girder?
The maximum eccentricity of the center to rail to centerline of girder shall be three-quarters of the girder web thickness”. While this quantity varies with girder size, the typical allowable value for the bulk of these runways is 3/8”.
Why is my trolley wheel wearing out?
It’s quite possible that if your trolley is experiencing extensive wheel wear, it’s due to a poorly aligned runway.
What is CAB operated crane?
CAB-OPERATED CRANES: Conditions during which a crane is performing functions within the scope of the original design. Under these conditions, the operator is at the operating control devices, and there is no other person on the crane.
What is a CAB in cranes?
CAB: The operator’s compartment used for controlling crane.
What is live load in bridges?
DEFLECTION, LIVE LOAD: The vertical displacement of a bridge girder due to the weight of the trolley plus the rated load.
What is a load block?
BLOCK, LOAD: The assembly of hook, swivel, bearings, sheaves, pins and frame suspended from the hoisting ropes. In a “short type” block, the hook and the sheaves are mounted on the same member, called the swivel. In a “long type” block, the hook and the sheaves are mounted on separate members. (The supporting member for the sheaves is called the sheave pin and the supporting member for the hook is called the trunnion.)
What is a Gantry leg?
GANTRY LEG: The structural member that supports a bridge girder or end tie from the sill.
What is an auxiliary hoist?
AUXILIARY HOIST: Supplemental hoisting unit usually of lower load rating and higher speed than the main hoist.
What is the angle formed by the wire rope and the drum groove or sheave groove in the plane?
FLEET ANGLE: The angle formed by the wire rope and the drum groove or sheave groove in the plane which contains the wire rope and is parallel to the drum or sheave axis.
What is a bridge crane?
A Bridge crane also known as overhead crane, overhead travelling crane, or industrial crane is a material handling machine which lifts, lowers, and transport a load horizontally. Typically, an Bridge crane involves a hook-and-line mechanism that moves along a horizontal beam which moves on a runway beam, the supporting structure .#N#Overhead canes are heavy duty material handling equipment with high lifting capacities for transporting load. Bridge crane travel is directed by an operator, either manually or with a wired pendant station or wireless controls. Typically, Bridge crane is used for the multi-directional movement of materials to help manufacturing, storing, loading or unloading works inside a facility or outside in a yard, or at a railway, or shipping port, and other application environments.
What is radio control crane?
Radio control: The radio control for Bridge crane is just like the pendant control except the operator uses a radio frequency instead of pendant. The radio control has higher safety feature and also provide the operator a wider range of operating motions that a pendant.
What is pendant control?
Pendant control: The pendant overhead control can give the crane operator precise control over the motion of the crane. According to the different functions, the pendant control has different configurations. The pendant control could be either suspended from the Trolley Hoist, which requires the crane operator to walk with and beside the load or on a separate sliding track system allowing the operator to move independently of the load.
How much weight can a bridge crane lift?
The single girder overhead is designed for handling loads of about 20 tons and the double girder and box girder Bridge crane can be used to handling materials above 20 tons.
How much can a double girder crane hold?
European double girder bridge crane with the crane capacity of 5 ton~ 80 ton. Buy bridge crane now.
What is the best configuration for a bridge crane?
Top running Bridge crane configuration is best used when headroom is an issue. Double girder top running configuration is the most space efficient one. Whereas when the headroom is not an issue a top or under running configuration can be either single girder or double girder.
How is a bridge crane supported?
Supporting systems: Usually, the Bridge crane is supported by runway structures, attached to workshop building or the Bridge crane could be supported on a free standing runway set up specifically for the crane.
How are crane runways made?
The construction of crane runways can be achieved by attachment to the main frames of the buiding or by mounting on independent columns. For top-mounted crane, they are made of two longitudinal beams (I-shape or box-shape) on which are fixed the rails where the wheels of the crane circulate.
What are variable crane actions?
(1) For normal service conditions, variable crane actions result from variation in time and location. They include gravity loads including hoist loads, inertial forces caused by acceleration/deceleration and by skewing and other dynamic effects.
What causes variable vertical crane actions?
variable vertical crane actions caused by the self-weight of the crane and the hoist load;
What section of crane bridge is manufactured?
The crane bridge can be manufactured in hot rolled section or in box section.
What is the vertical deflection of a runway beam?
vertical deflection of the runway beam : generally L/600
