Pre-loadable Ground Anchor with Adhesive Fiber Coupling
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Solution Overview
Problem
Conventional ground anchors with steel tension members pose difficulties in urban areas due to their persistence and the complexity of handling and prestressing glass fiber cables, which are more cumbersome and require intricate constructions.
Innovation Solution
A prestressable ground anchor utilizing non-metallic fiber materials, such as fiber optic cables or composite materials, with an adhesive connection to a coupling device, allowing for conventional prestressing methods and easy handling, enabling the anchor to be easily severed after use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If steel tension members are used in temporary anchors, then the anchors can be easily handled and prestressed with conventional equipment, but the tension members cannot remain in the ground and present obstacles during subsequent excavations
Solution Approach 1:
The harmful property (metallic nature causing obstacles) is extracted from the tension member by replacing steel with non-metallic fiber materials, while retaining the essential function of withstanding tensile forces. This allows the tension member to remain in the ground without creating obstacles for subsequent excavations.
Solution Approach 2:
The patent uses composite fiber materials (such as glass fiber, carbon fiber, or aramid fiber) that combine high tensile strength with non-metallic properties. These composite materials enable the tension member to be both structurally effective and easily cuttable, resolving the contradiction between strength requirements and ease of removal.
2Object-generated harmful factors
If fiber optic cables are used as tension members, then they can remain in the ground and are easier to cut, but they are significantly more complex to handle and require elaborate prestressing designs
Solution Approach 1:
The patent introduces a coupling device as an intermediary component that connects the non-metallic fiber tension member to the conventional prestressing system. This coupling device serves as a mediator, allowing the fiber optic cable to benefit from conventional steel-based prestressing equipment and methods without requiring complex specialized handling procedures.
Solution Approach 2:
The tension member system is segmented into two distinct parts: the non-metallic fiber portion embedded in the ground and the coupling device portion that interfaces with conventional prestressing equipment. This segmentation allows each component to be optimized independently - the fiber for ease of cutting and persistence, and the coupling device for compatibility with existing equipment.
3Object-generated harmful factors
If non-metallic fiber materials are used as tension members, then they can remain in the ground and are easily cut, but they require specialized connection methods to prevent damage
Solution Approach 1:
The patent replaces mechanical connection methods (such as clamps or mechanical fasteners that could damage the fiber) with adhesive bonding. This substitution eliminates the risk of mechanical damage to the delicate fiber structure while providing a secure connection to the coupling device, simplifying the manufacturing process.
Solution Approach 2:
The connection method changes from mechanical (rigid, potentially damaging) to chemical adhesive bonding (gentle, distribution of stresses). This parameter change in the connection approach allows the non-metallic fiber to be securely attached without risking damage, thereby simplifying the overall manufacturing process.
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
Enables efficient and straightforward prestressing using conventional equipment, reduces dismantling effort, and maintains a compact design, allowing the anchor to remain in the ground without causing obstacles during subsequent excavations or constructions.
Implementation Method 1
The anchor tension members (2) are bonded at one end (6) to a coupling device (4) by means of an adhesive (3)
Data Source
Figure 1~2
Figure 3
AI summary
In a prestressable grouted anchor (1) comprising a plurality of anchor tension members (2), wherein the anchor tension members (2) comprise a non-metallic fiber material, it is proposed that the anchor tension members (2) are bonded at one end (6) to a coupling device (4) by means of an adhesive (3), and that a tension member (5) for tensioning the prestressable grouted anchor (1) is at least indirectly connected to the coupling device (4).