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Under running Overhead cranes

The under running overhead crane is suspended from crane runways attached to the ceiling structure of a building.

Under running overhead cranes

 

Is your building too small for a conventional overhead crane?

No ground support for support columns? Are you looking for a solution integrated into the structure of your building for your lifting operations?

Suspended cranes, also known as under running cranes, are specially designed to meet these requirements.

 

What is an under running crane?

An under running overhead crane is a lifting device where the crane runs on rails attached directly to the ceiling (or to the building structure), unlike conventional overhead cranes which rest on rails laid on a structure.

 

Technical specifications

Lifting capacity: up to ~ 16 metric tons

Span: up to ~ 25 meters

Lifting height: up to ~ 20 meters

Hoist type: chain or wire rope

Runway: H- or I-beam fixed to building ceiling

 

Possible configurations :

 

  1. Single girder standard, double girder on request
  2. Straight or flush-mounted connection
  3. Other capacities, spans and lifting heights available on request
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    Right-hand connection
  • Under-running-encastre-300x267
    Flush-mounted connection

What are the advantages of under running overhead cranes?

 

  1. Ideal when building a self-supporting structure is not an option
  2. Generally better lateral approach to the hook
  3. Allows hoists to be transferred from one crane to another, or to a monorail, depending on the configuration.

What are the disadvantages of under running overhead cranes?

 

  1. Lifting capacity limited by building structure
  2. Span generally smaller than top running overhead cranes
  3. More frequent maintenance due to ceiling-mounted rails, which can be subjected to building movements. This can lead to rail misalignment.

Do you have a project in mind?

 

Request a project evaluation by filling out the form at the bottom of the page.

At Premium Industrial Group, we support you in configuring your overhead crane, with a single objective: to offer you the best lifting solution for safely lifting and moving your equipment.

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Frequently asked questions

01.
How to determine the frequency for frequent and periodic inspections?

The interval between each frequent and periodic inspection may vary depending on its duty class. To determine the frequency of these two types of inspections, you must identify the duty class of the lifting equipment (Class A to F) and refer to the CSA B167-16 standard (section 6.4.1 for frequent inspections and section 6.5.1.1 for periodic inspections).

Additionally, the inspection frequency should also take into account the actual duty class of the lifting device, which may differ from the class for which it was originally designed.

For more information on the topic, see our article: classifications

 

02.
Do you offer training services for overhead crane operators?
No, for now, Groupe Industriel Premium does not offer training for overhead crane operators. However, they recommend a partner company, SP Services-Conseils Prévention, for their expertise in this field. To learn more about training requirements, you can check out the article here: Is overhead crane operator training mandatory?
03.
Can the lifting capacity of an existing overhead crane be increased?

Yes, it’s sometimes possible, but it’s not guaranteed.

Increasing the capacity of an overhead crane involves more than just replacing the hoist. The entire system must be evaluated to ensure that every component can handle the increased load. Here are the main elements to check:

  • Is the main girder designed for the intended load?
  • Are the end trucks (wheels and gear motors) compatible with a higher capacity?
  • Can the runway, rails, and supporting structure withstand the additional stress?

In some cases, a well-planned modification can eliminate the need to purchase a new crane. In others, the costs or risks associated with the upgrade may be too high. An inspection can sometimes help determine whether an upgrade is feasible or if replacement is the better option.

Our recommendation: Before making any decisions, have your system (crane and runway) evaluated by a qualified engineer.

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Their ability to listen to our specific needs has been a major strength. They have always responded quickly and efficiently, especially in emergency situations, which has greatly contributed to the continuity and success of our operations. I highly recommend Groupe Industriel Premium to any company looking for a reliable, structured, and responsive partner. Their professionalism and commitment to quality and safety make them a model in the industry.

Jean-Denis Perron
Groupe Picard
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