Jib Crane Design

Project Info

Case:

Jib Crane Design

This project was implemented for providing the necessary calculations for a Jib Crane Design.
Furthermore, the necessary simulations and analysis were done to have a computational report as a proof of the manual calculations, the results, however, were identical.

Project description:

This project was mentioned for modeling an existing column of a building which had been fitted with a Jib Crane. The column is twisting under the torsional load as the Jib swings around.
The engineers’ duty was to determine whether the boxing in the column provides enough torsional resistance to keep the column twisting or not. And if not, what would be the additional design to stop the twist.
Therefore, our engineers first modeled the columns and applied the loads to simulate the entire system.
Other specifications of the project are as follows:
The 1 Ton Jib Crane brackets are 6’-0” apart centerline to centerline.
The ½ ton Jib Crane brackets are 4’-0” apart centerline to centerline.
The correlating boom beam height differs with the1ton beam height at 12-3/8” and the ½ ton beam height at 10-3/8”.

This project is among similar project we have already done, including, designing Monorail Systems, Bag lifts, Bridge Cranes, VRC’s and Workstation Cranes.

Challenges:

  • Modeling the columns and applying the loads to simulate the entire system.
  • To consider boxing in the tapered columns on both sides with ½” plate from 1’ below the lower bracket all the way up to 1’ above the higher bracket.
  • Determining whether the cap on the face flange of the columns contribute to the stiffening required or will, even more, be required.
  • Avoiding loads at the end of the Jib Crane which will cause a huge force on the bottom bracket.

Design Process:

  1. The bad distribution of forces in the Jib Crane cause a twist in the main column.
  2. The structure of the Jib Crane has to be boosted in specific parts.
  3. Distribution of forces must be revised to avoid column’s twisting
  4. Adding arm supports to reinforce the identified weak points.
  5. Moreover, the columns were covered with steel plates.
  6. At this point, the Jib Crane was able to bear a load equivalent to 1 ton.
  7. The Jib Crane was to cover an angular distance to the limit of 45° from the walls but subsequently, the client stressed to expand the angular distance to 0° from the walls.
  8. This was done, however, there were further challenges to be solved.

Work done:

Suggesting the client follow this method: welding a steel plate (0.5” thick) from 1’ below the lower bracket all the way up to 1’ above the higher bracket. To provide a suitable presentation the solution was modeled for the client. The following measurements were taken to fulfill the project:

  • Modeling the Jip Crane in Solidworks
  • Calculation and simulation reports
  • Modeling the solution in Solidworks

Wind Loads for Buildings and Structures, Simulations and Calculations

Description

Results:
The following results were obtained at the final phase of the project:
1. The entire system was simulated and the results of simulation was approved based on the manual calculations.
(This was also confirmed by the client practically after being tested mechanically).
2. The Jib Crane was modified and remanufactured based on the new design, which worked properly with a safety factor of 5.

Client:
Jared Rea
Date:
September 26, 2017
Location:
Australia
Category:
Mechanical Engineering