Why can't bridge cranes lift or move loads at an angle?
Category: Industry News
Release time:2020-02-13
The "Ten No-Lift Rules" for bridge cranes are essential operating guidelines that crane operators must strictly follow. According to these rules, crane operators are prohibited from performing angled or diagonal lifting—meaning the lifting steel cables must pass through the object's center of gravity and remain perfectly vertical. In other words, angled or diagonal lifting is not allowed. But why exactly is angled or diagonal lifting forbidden?
1 • Slant lifting creates inertial forces, posing a risk to surrounding personnel. Objects being lifted at an angle can develop inertia, making them prone to unhooking—and even endangering the safety of nearby workers, potentially leading to accidents.
2 • Slant lifting may lead to overload.
Suppose you need to lift a weight from the ground. Q The object, lifted vertically—steel cable tension S As long as it equals Q Or slightly larger Q Then, the heavy object can lift off the ground.
But if it’s tilted, the steel cable will form an angle with the vertical line to the ground. According to the principles of mechanics, the tension acting on the steel cable is S , which can be broken down into a force that acts vertically upward on the object P And the force of horizontal movement F To lift the object off the ground, P At least as much as Q Meanwhile F As the angle increases, so does the force. In other words, the greater the angle when lifting at an incline, the higher the tension in the wire rope—even for objects of the same weight. Therefore, if a heavy object is lifted vertically at full capacity, attempting to lift it at an incline will inevitably exceed the load limit, potentially leading to the wire rope snapping and causing an accident.
Additionally, the horizontal force component generated during angled lifting F When the heavy object is still affected by friction before it leaves the ground. The instant it breaks free from the surface, this can cause the object to swing toward the vertical center—potentially colliding with riggers, nearby workers, or other objects, leading to an accident.
In short, slinging at an angle not only risks overloading and snapping the wire rope but also causes the heavy object to swing, potentially colliding with objects and people—and thereby leading to personal injuries and equipment accidents.
Keywords: Why can't bridge cranes lift or move loads at an angle?
Related News
Chengdu Chengde Heavy Forging Co., Ltd.
Contact: Mr. Feng
Mobile phone: +86-13982279038
Landline: +86-2883066386
Mobile phone: +86-18980030810 (Sales Director, Minister Wang)
Mailbox: 423136809@qq.com
Address: Jinniu Village, Xinmin Town, Xindu District, Chengdu City, Sichuan Province
Website QR Code
COPYRIGHT © 2025 Chengdu Chengde Heavy Forging Co., Ltd. All rights reserved. Powered by ceglobal.cn SEO