Underground Concealed Arch Foundation Reinforcement
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Solution Overview
Problem
Current methods for reinforcing poor foundations, such as soft soil and karst foundations, are limited by high costs, environmental impact, long construction periods, and specific soil condition requirements, making them unsuitable for all construction scenarios.
Innovation Solution
The use of high-pressure rotary jet piles and concealed arch structures to create a pile foundation and arch ring system that enhances bearing capacity with low noise, minimal construction restrictions, and wide applicability, utilizing high-pressure jet grouting to mix cement paste with soil and form consolidated columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If surcharge preloading is used to reinforce poor foundation, then the technology is mature and easy to conduct, but soft soil needs a longer consolidation period which is not suitable for projects with tight construction period
Solution Approach 1:
The patent replaces the mechanical surcharge preloading system with a high-pressure jet grouting system that uses high-pressure fluid injection to consolidate soil. The jet grouting method uses a high-pressure pump to inject grout through a rotating nozzle, creating cemented soil columns that immediately strengthen the foundation without requiring long consolidation periods.
Solution Approach 2:
The patent employs hydraulic principles through high-pressure jet grouting, where grout is injected at pressures of 20-50 MPa through a rotating nozzle system. The high-pressure fluid jet cuts and mixes with soil particles, forming solidified columns that provide immediate foundation reinforcement, eliminating the time-consuming consolidation phase of traditional preloading.
2Productivity
If chemical reinforcement is used to quickly strengthen soft soil subgrade, then the construction speed is improved, but the cost is too high to control the project cost
Solution Approach 1:
The patent changes the key parameter of grout injection pressure to optimize the mixing efficiency and structural strength of cemented soil columns. By controlling pressure parameters (20-50 MPa) and rotation speed, the system achieves rapid soil consolidation with cost-effective cement dosages, balancing construction speed and project cost.
Solution Approach 2:
The patent creates composite cemented soil columns by mixing grout with soil particles through high-pressure jet injection. This composite material combines the binding properties of cement with the structural properties of in-situ soil, providing rapid strength gain at lower cost compared to pure chemical reinforcement methods.
3Strength
If soil replacement is used to treat poor foundation, then the bearing capacity is improved, but a lot of excavation and filling is required which has a great negative impact on the environment
Solution Approach 1:
The patent extracts only the necessary binding agent (cement grout) and injects it directly into the poor soil in-situ, rather than removing and replacing the entire soil mass. This selective reinforcement approach maintains the existing soil structure while improving bearing capacity, minimizing environmental disturbance.
Solution Approach 2:
The patent enables the existing poor soil to serve itself by mixing it with grout in-situ through jet grouting. The soil particles are cut, mixed, and consolidated with cement grout at their original location, creating self-supported cemented columns without requiring excavation, transport, or external filling materials.
4Reliability
If cast-in-place pile is used to reinforce poor foundation, then the foundation stability is improved, but the construction is difficult, the required materials are expensive, and the construction period is long
Solution Approach 1:
The patent replaces complex mechanical pile construction equipment with a simpler high-pressure jet grouting system. Instead of using heavy drilling rigs, formwork, and reinforcement steel for cast-in-place piles, the system uses a high-pressure pump and rotating nozzle to create cemented soil columns, significantly reducing construction difficulty and equipment 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 improves engineering efficiency, reduces construction difficulty and costs, and provides excellent stress performance and spanning capacity, making it suitable for various working conditions and reducing material consumption.
Implementation Method 1
Under strong power of the high-pressure jet flow, the soil is damaged, and soil particles are peeled off from the soil layer and mixed with the cement paste to form a mixed slurry
Implementation Method 2
The rest of the soil particles are rearranged according to a certain ratio of the cement paste to the soil under the impact force, centrifugal force, gravity and other forces of the high-pressure jet flow
Implementation Method 3
a grouting pipe with a special nozzle is inserted into a designed soil depth, and then high-pressure cement paste is injected from the nozzle to cut the soil
Implementation Method 4
After the mixed slurry solidifies, columnar consolidation bodies with certain strength are formed in the soil layer
Data Source
AI summary
A poor foundation reinforcement system and a reinforcement method based on underground concealed arch structures are provided. The system and the method belong to the technical field of poor foundation treatment. The reinforcement system includes multiple columns of pile foundations arranged along a bridge direction. Multiple arch sheets are set in parallel between each two adjacent columns of pile foundations. Each arch sheet includes multiple high-pressure rotary jet piles arranged along the bridge. Each two adjacent arch sheets of the multiple arch sheets are connected by a micro-bending slab disposed on the two adjacent arch sheets, the multiple arch sheets are connected by the micro-bending slabs to together form an arch ring, and a construction joint is disposed between each two adjacent micro-bending slabs of the micro-bending slabs.