Importance of Earthquake Measures for Overhead Cranes *Patent Obtained

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last updated：Aug 25, 2022

今井鉄工所本社

Implement earthquake measures for overhead cranes as part of BCP (Business Continuity Planning) strategies. We are also introducing this for cranes used in vehicle inspection and repair facilities.

Ceiling cranes are essential equipment for transporting heavy objects and are used in various manufacturing facilities, including automobile and railway factories. However, in recent years, numerous accidents have occurred on-site due to the frequent occurrence of massive earthquakes, such as: 1. Derailment caused by bouncing or lifting, resulting in the ceiling crane falling. 2. Falling of the running rail due to insufficient strength of the fixing hardware. As a result, there have been cases where employees were trapped under the crane, or the factory's resumption of operations was significantly delayed, leading to substantial impacts on both safety and economic aspects. By introducing the following products, we can prevent derailment and sudden drops of ceiling cranes caused by earthquakes. 'Crane Gripper' By integrating the saddle and gripper, it maintains a state of gripping the rail, making it physically difficult to disengage. 'Rail Keeper' It has greater strength than conventional hook bolts, reducing the risk of the crane falling along with the rail. *You can also view experimental materials from the PDF download. Please feel free to contact us for inquiries.*

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【Example of the Kumamoto Earthquake】 ■Companies in Kumamoto Prefecture There were a total of four earthquakes with a seismic intensity of 6 to 7, but the overhead crane did not fall, allowing production to continue. ■Steel suppliers in Kumamoto Prefecture Although there was damage such as falling ceiling panels and collapse of steel materials, the overhead crane remained intact, enabling steel shipments just a few days after the earthquake. 【Basic Structure】 ■Integration of the saddle and gripper. ■Maintaining a gripping state while ensuring a certain gap with the rail. ■The claw section follows the lateral undulations of the rail, achieving a structure that is physically difficult to disengage while maintaining a gripping state on the rail.