Ground Anchor Cage of Bars for Removable Tension Member
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Solution Overview
Problem
Existing soil and rock anchors with removable tension members pose obstacles during future construction work due to their components, such as prestressing steel strands and pressure pipes, which are difficult to dismantle and remove, and segment-based designs that complicate load-bearing capacity testing.
Innovation Solution
A soil and rock anchor featuring a cage of rods that run continuously from the end anchorage to their ends, made of materials with low notched impact strength, allowing for easy destruction and integration with cement mortar to form a pressure pipe for introducing anchor force into the subsoil, eliminating segment play and facilitating complete removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-piece steel pressure pipe is used, then the anchor structure is simple and strong, but the pipe cannot be removed and poses an obstacle to future construction work
Solution Approach 1:
The pressure pipe is divided into multiple segments that can be separated from each other. Each segment is connected through specific connection elements that allow for controlled separation, enabling complete removal of the pressure pipe system after the anchor has served its purpose, thus eliminating the obstacle to future construction work while maintaining structural integrity during use.
2Object-generated harmful factors
If the pressure pipe is composed of several segments, then the pipe can be removed, but the segments may have play between them affecting measurement precision
Solution Approach 1:
The segments are designed with connection elements that merge them into a unified structural system during operation. The connection elements ensure that the segments act as a continuous pressure pipe, eliminating play between segments and ensuring precise displacement measurements during anchor tests, while still allowing for complete removal of the segmented system after use.
3Object-generated harmful factors
If glass, ceramic or high-strength concrete segments are used, then the segments are destructible and can be removed, but ensuring proper bonding and eliminating play between segments is difficult
Solution Approach 1:
Connection elements serve as intermediaries between the glass, ceramic or high-strength concrete segments. These connection elements are specifically designed to bond with the brittle segment materials while maintaining structural integrity. The connection elements eliminate play between segments by providing precise alignment and rigid connection, enabling both destructibility for removal and manufacturing precision for measurement accuracy.
4Measurement precision
If Dyw_idag threaded rods with plastic sleeves are used, then segment play is eliminated, but the rods are composed of multiple segments that remain in the ground after destruction
Solution Approach 1:
The pressure pipe segments are designed to be completely destructible and removable after serving their function. The segments are made from materials that can be easily destroyed and removed, unlike traditional steel pipes. After the anchor has served its purpose, the entire segmented pressure pipe system can be completely removed from the ground, eliminating any remaining obstacles, while the connection elements ensure no play between segments during measurement.
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 complete dismantling of the anchor system without leaving obstacles, simplifies load-bearing capacity testing, and reduces costs by using easily destructible materials that do not interfere with future construction work.
Implementation Method 1
the tension member can be weakened for dismantling purposes by suitable measures, such as induction heating, so that it breaks under the applied forces
Data Source
Figure 1
Figure 2~3
AI summary
The anchor for anchoring in soil and/or rock comprises a removable tension member, which runs freely within a casing (6) and is held in an end anchor (9), a release device for detaching the tension member from the end anchor during removal, and a cage of bars (7) arranged around the casing (6). The bars extend continuously from the end anchor (9) to their respective ends. The bar ends define the end of the cage opposite the end anchor (9). The bars (7) serve as reinforcement for a pressure pipe (12), which can be formed to transfer the anchor force into the subsoil (1) by injecting cement grout between the casing (6) of the tension member (5) and the borehole wall after the anchor has been installed.