Cavity-Type Load Box With U-Shaped Sealing Plate
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Solution Overview
Problem
Traditional cavity-type load boxes used for testing compressive resistance of foundation piles are prone to deformation issues and damage, particularly at weld points, due to complex structures and inadequate pressure distribution.
Innovation Solution
A cavity-type load box design featuring oil cavity units with U-shaped sealing plates and transition blocks, allowing for uniform pressure application and improved deformation accuracy through a network of interconnected oil cavities and strategically positioned welds that avoid direct tensile forces on weld points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hydraulic cylinders are used for loading, then the compressive resistance testing can be performed, but the structure becomes complex and difficult to transport
Solution Approach 1:
The load box is divided into multiple oil cavity units (first, second, third oil cavity units) that can be separately manufactured and then assembled together. Each unit contains its own sealing plate and flat plates, allowing for modular construction that simplifies transportation while maintaining the required testing capability through combination of units
Solution Approach 2:
The patent uses hydraulic oil injected into the oil cavity units to generate the loading force. The hydraulic system replaces the complex traditional hydraulic cylinder mechanism with simpler oil-filled cavities that expand and contract to apply load, maintaining testing reliability while reducing structural complexity
2Device complexity
If metal sheets are welded to form oil cavity units, then the structure is simple and easy to transport, but the weld points are prone to damage from tensile forces
Solution Approach 1:
The sealing plate is designed with a specific U-shaped cross-section configuration that locally concentrates the stress in the bulk material away from the weld points. The weld points only need to provide structural support while the sealing plate's geometry handles the tensile forces, creating different functional zones that protect the welds
Solution Approach 2:
The oil cavity unit combines flat plates with U-shaped sealing plates to create a composite structure. The sealing plate material and geometry are specifically chosen to handle the tensile stresses from hydraulic pressure, while the flat plates provide structural support and connection points, distributing forces away from weld locations
3Manufacturing precision
If the sealing plate is stretched under liquid oil pressure to cause deformation, then the deformation effect is achieved, but the structure may be damaged due to stress concentration
Solution Approach 1:
The U-shaped sealing plate acts as a flexible element that can be stretched by hydraulic pressure to deform the oil cavity unit and apply load. The sealing plate's geometry and material properties are designed to provide the necessary flexibility for controlled deformation while maintaining sufficient strength to prevent structural damage
Solution Approach 2:
The patent controls the deformation by adjusting parameters such as the U-shaped sealing plate's cross-sectional dimensions, material properties, and the hydraulic oil pressure. By optimizing these parameters, the sealing plate can be stretched to the required degree for accurate deformation control without exceeding the material's elastic limit and causing permanent damage
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
The design enhances deformation accuracy and reduces the risk of damage by ensuring uniform pressure distribution and facilitating easier transportation and assembly, while maintaining structural integrity.
Implementation Method 1
after the liquid oil enters an oil cavity via the oil injection structure, the sealing plate is stretched under the pressure of the liquid oil to cause deformation of the oil cavity
Implementation Method 2
the sealing plate is a thin metal plate with good ductility
Implementation Method 3
Liquid oil injected from the oil injection structure flows into the oil cavity unit
Data Source
AI summary
A cavity-type load box includes an oil cavity unit. The oil cavity unit includes a sealing plate with a U-shaped section and two flat plates with edges wrapped in the sealing plate and is provided with an oil injection structure. Liquid oil injected from the oil injection structure flows into the oil cavity unit. The edges of the two flat plates are wrapped in the sealing plate with the U-shaped section, so that after the liquid oil enters an oil cavity via the oil injection structure, the sealing plate is stretched under the pressure of the liquid oil to cause deformation of the oil cavity. As a stress required for deformation of the sealing plate is very small, the pressure generated by the liquid oil directly acts on an object on the upper or lower surface of the cavity-type load box, and accordingly, the object s pushed.