Development & Design of Large-Tonnage and Great-Height Hydraulic Continuous and Synchronous Jack-Up System

Abstract

At present, as the increasing of ultra-large structures, the contradiction that domestic lifting equipments can not meet the requirement of ultra-large structure’s lifting has become increasingly prominent. Based on the need of ultra-large steel structures (offshore oil platforms) jack-up, using strength theory and finite element analysis, a hydraulic continuous jack-up system for ultra-large structures’ jack-up was studied in this article. A new control system, which combines mechanics, hydraulics and electrics, was presented. More particularly, the modules of speed control and multi-cylinder synchronous control for the ultra-large structure’s lifting was designed. In the WINCC environment, a human-computer interface (control software) was developed by VB to achieve the system's real time monitoring and synchronization control. All movements of the jack-up system could be controlled through the software. To conclude, the jack-up system consists of two parts: the mechanical support structures and the control system. The former can assure great height (10m or more) jack-up, and the later can accomplish multi-point (more than 4 points) synchronous jack-up.

Numerical Analysis of the Structural Properties of Girdling Beam for a Square Column Used in Bridge Jacking Construction

“…e girdling beam is a common form of jacking support system, it is also an important component as the role of force system conversion in the process of jacking, the stress condition of the girder under load is very complex, and its structure safety is directly related to the safety of the whole bridge jacking process [10][11][12]. At present, there are a few studies on the structural performance of girdling beams, and the solutions to some problems are only based on experience or refer to other related projects [13]. erefore, it is necessary to study the structural performance of the girdling beam.…”