Vibration Roller with Dual Detectors for Real-Time Soil Modulus
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Solution Overview
Problem
Current methods for detecting the modulus of elasticity of soil layers, such as the falling weight deflectometer, are time-consuming and hinder real-time compaction control due to their inability to differentiate between individual layer moduli in multi-layered soil structures, especially unbound layers, and provide delayed results.
Innovation Solution
A drivable device equipped with a vibration means and two detection devices, one in the load introduction area and another outside, allows for simultaneous soil compaction and precise measurement of depression troughs to determine the equivalent and bedding moduli of elasticity, enabling continuous monitoring and control during compaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the falling weight deflectometer method is used to detect layer modulus of elasticity, then measurement precision is improved, but loss of time increases significantly
Solution Approach 1:
The patent combines the compaction device and detection devices into a single integrated system. The detection devices are mounted on the compaction device, allowing simultaneous compaction and measurement operations. This merging eliminates the need to stop compaction for separate FWD measurements, thereby reducing time loss while maintaining measurement precision.
Solution Approach 2:
The patent enables continuous compaction and measurement operations by integrating the detection system into the compaction device. The detection devices continuously monitor depression troughs during the compaction process, allowing real-time determination of layer moduli without interrupting the compaction workflow. This continuity significantly reduces measurement time compared to traditional stop-and-measure approaches.
2Measurement precision
If detection devices are placed far from the load introduction area, then the influence of deeper layers on measured depressions increases, but measurement precision for uppermost layer moduli decreases
Solution Approach 1:
The patent employs multiple detection devices positioned at different distances from the load introduction area. Detection devices closer to the load center primarily measure the uppermost layer's response, while devices farther away capture the influence of deeper layers. This local quality differentiation allows the system to isolate and measure the modulus of elasticity of specific layers by analyzing the differential responses at various positions.
3Productivity
If compaction continues after maximum compaction is achieved, then productivity is maintained, but loss of energy increases due to renewed loosening and excess strain
Solution Approach 1:
The patent implements real-time feedback control by continuously monitoring the depression troughs during compaction operations. The detection devices provide continuous data on the compaction status and layer modulus of elasticity, allowing the system to identify when maximum compaction has been achieved. This feedback mechanism enables the compaction process to automatically adjust or terminate, preventing energy waste from excessive compaction while maintaining optimal productivity.
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 approach enables rapid, cost-effective, and precise determination of soil layer moduli, allowing for effective compaction control and real-time monitoring of the compaction status and carrying capacity of soil structures, particularly asphalt roads.
Implementation Method 1
a vibration means or device, via which load pulses which compact the soil layer structure can be introduced into at least one load introduction area
Implementation Method 2
a first and a second detection device for detecting a modulus of elasticity of the soil layer structure
Data Source
AI summary
The present invention relates to a drivable device for compacting a soil layer structure, having at least one vibration means or device, such as a vibration roller or a vibration plate, via which load pulses (P), which compact the soil layer structure, can be introduced into at least one load introduction area. At least one first and one second detection means or devices for detecting the modulus of elasticity of the soil layer structure are provided, which are situated spaced apart from one another on the drivable device in such a way that the first detection means or device allows a detection in the load introduction area and at least the second detection means or devices allows a detection outside the load introduction area. The present invention also relates to a method for ascertaining a layer modulus of elasticity.