Telescopic Jack System for Demolition
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Solution Overview
Problem
Existing building demolition methods by jacking face challenges in reducing the number of jacks required, protecting the jacks from high stress, and achieving precise control over the demolition process, particularly in multi-storey buildings with load-bearing walls and slabs.
Innovation Solution
A cylinder frame and thrust device system that allows jacks to act between distant load-bearing walls, using hydraulic cylinders for precise control, and incorporating bracing devices to distribute forces and prevent damage to the jacks, while allowing for adaptable use with single or double-acting cylinders and multiple stages for increased amplitude and force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If standard jacks of lower cost are used, then the cost is reduced, but the length is insufficient to act between distant load-bearing walls
Solution Approach 1:
The jack system is divided into multiple stages arranged in series, where each stage consists of one or more standard-length jacks. This segmentation allows the total effective length to span distant load-bearing walls while using only commercially available standard-length jack components, thereby maintaining cost effectiveness.
Solution Approach 2:
Multiple jack stages are nested or arranged in series within a common frame structure. The output of one jack stage feeds into the input of the next, creating a telescopic effect that achieves greater total stroke length than any individual jack could provide, while each component remains a standard-length unit.
2Length of moving object
If jacks are used to act between distant elements, then the spacing between load-bearing walls can be accommodated, but the jacks are subjected to very high stresses and are not always reusable
Solution Approach 1:
A bracing device is installed beforehand to provide structural support and distribute the thrust forces across multiple load-bearing elements. This cushioning effect prevents any single jack from bearing excessive stress that would compromise its integrity or reusability, while still allowing the jacks to achieve the necessary spacing between distant elements.
3Quantity of substance
If the number of jacks is reduced, then the cost and complexity are reduced, but the ability to control the demolition process precisely is compromised
Solution Approach 1:
Multiple jacks are combined in parallel stages within a single frame structure, allowing them to be controlled simultaneously through a common hydraulic system. This merging approach reduces the total number of independent control systems needed while maintaining precise control over the demolition process through centralized hydraulic pressure regulation.
Solution Approach 2:
The hydraulic control system incorporates feedback mechanisms that monitor the position and load of each jack stage, allowing precise adjustment of thrust forces. This feedback control enables accurate management of structural displacements even with a reduced number of jack assemblies, maintaining demolition precision while reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the number of jacks needed, protects the jacks from excessive stress, and enables precise control over the demolition process, allowing for synchronized collapse of buildings by optimizing the use of hydraulic pressure and structural displacement measurements.
Implementation Method 1
a given floor among one or more floors called critical floors having tilted or offset walls under the effect of jacks relative to the other non-critical floors of the building
Implementation Method 2
A cylinder frame (5) for a thrust device (1) as well as a thrust device (1) with said frame and its cylinder(s), a bracing device (20) and their implementation methods are also presented
Data Source
Figure 1~2c
Figure 3a~3c
Figure 4a~4b
AI summary
The invention relates to a method for demolishing a building with a plurality of floors by jacking with thrusting apparatuses arranged obliquely between two opposing bearing walls. Each of the thrusting apparatuses is arranged in order to exert a thrust between two opposing bearing walls which are a wedging wall and a thrust wall. The thrust and wedging walls are weakened by making at least two main saw lines, at least one on the thrust wall and at least one on the wedging wall, the main saw line of the thrust wall being towards the top of the thrust wall, below the level of the head end of the thrusting apparatus, the main saw line of the wedging wall being towards the bottom of the wedging wall, above the level of the foot end of the thrusting apparatus, the main saw lines not passing fully through said thrust and wedging walls, and leaving a predetermined thickness of material at the level of said lines. The invention further relates to a chassis for (a) jack(s), thrusting and bracing apparatuses and the methods of use thereof.