A Bridge Crane consists of an assembled structure which spans between parallel rails or runway tracks, and is adapted to carry a suspended load horizontally along the runway. Bridge cranes can be top running or under-hung with single or double girder configurations. They also incorporate hoists on trolleys to move the load laterally as well as vertically. Bridge cranes can be mobilized via push trucks, geared, or motorized end trucks.
J. Herbert Corporation has been designing, manufacturing, and installing custom designed bridge cranes over the past 35 years. All cranes have been designed in accordance with CMAA specifications.
Contact our Customer Service Department for more information on Bridge Cranes.
UNDERSTANDING OVERHEAD BRIDGE CRANES
Moving tonnage requires heavy-duty tools to ensure that the job is done safely and efficiently. The bridge crane, consisting of two overhead beams, or runways, that create a track for another perpendicular and horizontal beam, acts as both a lift and trolley for heavy materials.
Overhead Bridge Crane
While there is a difference between a gantry crane, an entirely wheeled and mobile structure, and a bridge system, the terms are often used interchangeably. These overhead systems operate with either a single or double girder system, supporting heavy loads while providing ample headroom.
Workstation cranes are often smaller than standard bridge systems but are still a versatile tool for lighter operations. This style of crane uses an enclosed track and is known for its consistency in the manufacturing industry. It also provides a full range of motion.
Top Running Cranes
A top running crane is an electronic overhead traveling crane that rides along the top of the runway beams. A typical top running system can transport or lift loads up to 35 tons with an average span of 90 feet. Obviously, there are custom setups that may allow for more versatility in design.
Under Running Cranes
Under running or underhung cranes provide a little less lift than top running systems. You can typically find these systems with a load capacity of up to 25 tons and a limited span of 75 feet. Most systems do not span more than 60 feet.
Single Girder Systems
A single girder crane is the most cost-effective option and consists of a single beam that spans the two guardrails, sitting on top or below with runway trucks. Single girder configurations hold less weight but are incredibly dependable systems, and they can be customized for your company's specific needs.
Double Girder Systems
Double girder systems are considered the workhorse models of bridge systems. These cranes consist of two bridge beams, which are typically mounted above the runway beams. If you need to lift weights of 100 plus tons, then a double girder system is what you are after.