Threaded Ground Inclusions for Load Distribution
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Solution Overview
Problem
Traditional soil reinforcement methods using inclusions require substantial grout and can cause ground heave, leading to quality concerns and increased costs, especially when dealing with mechanically weak soils like clay.
Innovation Solution
The use of threaded inclusions with a cylindrical core and helical threads, made from materials with specified compressive strength, which reduce the volume of material needed and minimize ground displacement, thereby reducing heave and stress on the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional inclusions are used to reinforce mechanically weak ground, then load-bearing capacity is improved, but ground heave occurs and quality concerns arise
Solution Approach 1:
The inclusion is segmented into a cylindrical core and helical threads, where the core provides structural strength and the threads provide soil engagement. This segmentation allows the inclusion to bear load effectively while the helical geometry reduces overall material volume and ground displacement compared to solid cylindrical inclusions.
Solution Approach 2:
The invention changes the geometric parameters of the inclusion by using a hollow cylindrical core with external helical threads instead of a solid cylinder. This parameter change reduces the volume of grout material needed while maintaining load-bearing capacity through the helical thread engagement with the soil, thereby reducing ground heave.
2Strength
If traditional inclusions are used to reinforce ground, then mechanical reinforcement is achieved, but substantial amount of grout is required
Solution Approach 1:
The inclusion uses a hollow cylindrical core structure that is inherently porous or cavity-containing, reducing the volume of grout material required while maintaining structural integrity. The helical threads are formed around this core, providing soil engagement without requiring solid filling of the entire cylindrical volume.
Solution Approach 2:
The inclusion is constructed as a composite structure with a cylindrical core and external helical threads, combining different geometric forms to achieve both structural strength and material efficiency. This composite geometry allows load-bearing capacity while minimizing grout volume compared to traditional solid cylindrical inclusions.
3Strength
If inclusions are installed in mechanically weak ground, then load transmission to deeper layers is improved, but larger pile diameters and higher steel reinforcement are required
Solution Approach 1:
The inclusion is segmented into a cylindrical core and helical threads, where the core provides structural strength and the threads provide soil engagement. This segmentation allows the inclusion to bear load effectively while reducing overall material volume and ground displacement compared to solid cylindrical inclusions.
Solution Approach 2:
The invention changes the geometric parameters of the inclusion by using a hollow cylindrical core with external helical threads instead of a solid cylinder. This parameter change reduces the volume of grout material needed while maintaining load-bearing capacity through the helical thread engagement with the soil, thereby reducing ground heave.
Data Source
AI summary
The disclosure relates to a device for reinforcing a ground on which is disposed a loading structure. Threaded inclusions are disposed vertically within the ground and reinforce said ground. The core diameter of threaded inclusions is between 250 mm and 450 mm and the external diameter is between 350 mm and 600 mm. A load transmitting layer is interposed between the ground and the loading structure disposed thereon, so as to transmit and distribute the load from the loading structure to both the ground and the plurality of inclusions. A ratio between a distance between axes of two adjacent inclusions and the internal diameter of said adjacent inclusions is between 4 and 14, and the inclusions are made from a material having a specified 28-day compressive strength between 5 MPa and 35 MPa.