Double-Spiral-Tube Grouting Device for Soft Soil
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Solution Overview
Problem
Existing methods for strengthening soft soil, particularly underwater soft soil, are inefficient due to high water content and limited applicability, with prior technologies failing to effectively combine drainage consolidation with grouting and pile forming methods.
Innovation Solution
A double-spiral-tube structure with an outer and inner spiral tube, where the inner space forms a grouting cavity and the space between them forms a drainage and delivery cavity, equipped with drainage and delivery holes and a filter screen, used in conjunction with a grouting and pile forming device that includes a compartment box for storing a soft soil consolidation agent and a water pump, allowing for drainage and chemical consolidation followed by upward spiral lifting with cement slurry injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior soft soil treatment methods (drainage consolidation, grouting, dynamic compaction) are used separately, then each method can address specific soil issues, but they cannot effectively solve the combined problems of high water content and low bearing capacity in underwater soft soil
Solution Approach 1:
The patent combines drainage consolidation and grouting methods into a single integrated device. The double-spiral-tube structure allows simultaneous execution of drainage (through outer tube with holes) and grouting (through inner tube), resolving the limitation of prior methods that could only be applied separately to underwater soft soil.
Solution Approach 2:
The grouting and pile forming device is designed to perform multiple functions: drainage consolidation through the outer spiral tube, grouting through the inner spiral tube, and pile forming through the combined action. This multi-functionality enables effective treatment of underwater soft soil that previously required multiple separate operations.
2Length of moving object
If vibration is applied to penetrate the soft soil layer, then the device can reach deeper depths, but the spiral tubes may become blocked by soil particles
Solution Approach 1:
The patent applies different functional qualities to different parts of the device: the outer spiral tube is equipped with drainage holes and filter screens for water extraction, while the inner spiral tube provides structural support and grouting functionality. This local differentiation allows the drainage holes to maintain patency through localized filtration while achieving deep penetration.
Solution Approach 2:
Filter screens are introduced as intermediary elements between the drainage holes and the soft soil. These screens prevent soil particles from blocking the drainage holes while allowing water to pass through, resolving the contradiction between deep penetration and hole patency maintenance.
3Productivity
If a single-tube structure is used for grouting, then the device is simpler, but it cannot simultaneously perform drainage consolidation and grouting
Solution Approach 1:
The patent employs a nested double-spiral-tube structure where the inner spiral tube is positioned within the outer spiral tube. This nesting arrangement allows simultaneous drainage consolidation (outer tube) and grouting (inner tube) operations without requiring separate devices, achieving high productivity while maintaining relatively compact and manageable device 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 method effectively reduces water content, chemically consolidates the soft soil, increases its strength and bearing capacity, and is adaptable for various depths and environments, including land and deep-sea applications, offering a simple, flexible, and reliable solution for soft soil strengthening.
Implementation Method 1
the water pump is started; the water pump operates to extract pore water from the soft soil layer through the filter screen and the drainage and delivery holes
Implementation Method 2
the soft soil consolidation agent enters the soft soil layer through the filter screen, and reacts with the soft soil to chemically consolidate the soft soil
Data Source
AI summary
A grouting and pile forming device includes a compartment box and a double-spiral-tube structure. The double-spiral-tube structure includes an outer spiral tube and an inner spiral tube, which are nested and fixed together. A top part of the outer spiral tube and a top part of the inner spiral tube are hermetically connected. An inner space of the inner spiral tube forms a grouting cavity. A space between the outer spiral tube and the inner spiral tube forms a drainage and delivery cavity. A plurality of drainage and delivery holes are provided in a tube body of the outer spiral tube. A construction method for strengthening soft soil through the grouting and pile forming device includes the following steps: 1) operation preparation; 2) downward spiral penetration; 3) drainage consolidation; 4) chemical consolidation; 5) upward spiral lifting; and 6) repeated operation until all soil to be strengthened is treated.