Variable-Diameter Reinforcing Cage for Anchor Rods
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Solution Overview
Problem
Existing anchor rod and pile foundation technologies face limitations in providing sufficient uplift resistance and stability, especially in anti-floating foundation pit supporting and slope reinforcing, due to insufficient anchoring force and poor bearing capacity, which is exacerbated by the low tensile strength of soil-rock masses.
Innovation Solution
A variable-diameter reinforcing cage system for anchor rods and pile foundations, featuring a movable mechanism with adjustable diameter, comprising an axial rod, circular ring, vertical bars, ribs, and circular fixators, allowing for expansion and contraction using elastic materials and release devices, enhancing friction resistance and anchoring force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a fixed-diameter reinforcing cage is used in anchor rods or pile foundations, then the structure is simple and easy to manufacture, but the anchoring force and uplift resistance are insufficient
Solution Approach 1:
The reinforcing cage transforms from a fixed-diameter structure to a variable-diameter structure that can expand and contract. The cage includes an axial rod, circular ring, vertical bars, ribs, and circular fixators that enable dynamic diameter adjustment. This allows the cage to adapt to different soil conditions and loading requirements, significantly increasing anchoring force and uplift resistance while maintaining manufacturability through modular components.
2Strength
If the diameter of the reinforcing cage is increased to provide larger uplift resistance, then the bearing capacity increases, but the material usage and construction costs increase
Solution Approach 1:
The variable-diameter cage allows the structure to expand only when and where needed to provide sufficient uplift resistance. The elastic materials and release devices enable the cage to maintain a compact form during installation (reducing material usage) and then expand in-situ to achieve the required bearing capacity, optimizing the balance between strength and material consumption.
Solution Approach 2:
The cage structure concentrates reinforcement where it is most needed - the variable diameter allows for increased cross-sectional area and material concentration in the anchoring zone where uplift resistance is critical, while maintaining a smaller diameter in other sections to reduce overall material usage.
3Reliability
If a variable-diameter reinforcing cage with movable mechanism is implemented, then the anchoring force and stability are significantly increased, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The movable mechanism incorporates an axial rod that can slide within the circular ring, vertical bars that can rotate or translate, and circular fixators that can move along the axial rod. These components work together with elastic materials and release devices to enable controlled expansion and contraction, providing stable and reliable performance while maintaining reasonable manufacturability through standardized component design.
4Adaptability or versatility
If the reinforcing cage is designed with expansion and contraction capability, then the adaptability to different soil conditions is improved, but the device complexity increases
Solution Approach 1:
The variable-diameter cage provides adaptability to different soil conditions and loading requirements through its expansion and contraction capability. The axial rod, circular ring, vertical bars, and circular fixators form a coordinated mechanism that can adjust the cage diameter in-situ, allowing the same standardized component design to serve multiple application scenarios from soft clay to rocky soils.
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 variable-diameter reinforcing cage significantly increases anchoring force and stability, providing larger uplift resistance and compressive resistance, while reducing material usage and construction costs, thus improving the integrity and durability of anchor rods and pile foundations.
Implementation Method 1
the annular hoops are annular spiral spring hoops made of an elastic material... the end of the annular spiral spring hoops is fitted with a release device
Implementation Method 2
when flexible steel wires are used, a release device for stretching out the vertical bars of the ribs is arranged at the circular fixator
Data Source
AI summary
A variable-diameter reinforcing cage for an anchor rod or pile foundation, comprising an axial rod (4), a plurality of vertical bars (2), at least two circular fixators (5) and several groups of ribs (3) which correspond to the circular fixators (5). The circular fixators (5) are all sleeved on the axial rod (4); one end of the ribs (3) is movably connected to the position of the vertical bars (2) at the same height, and the other end of the ribs (3) is movably connected to the circular fixators (5); annular hoops (6) are arranged on the periphery of the vertical bars (2) to serve as circles of latitude; fixing points are formed on the annular hoops (6) and the vertical bars (2); and the annular hoops (6) are annular spiral spring hoops of an elastic material or flexible steel wires.