Ground Anchor Guide Bracket Stepwise Retention Deep Excavation
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Solution Overview
Problem
Conventional earth retaining methods during deep excavation require extensive use of retention materials and struts, which are economically unfavorable and inconvenient in narrow urban spaces, and often result in damage to existing structures and groundwater intrusion.
Innovation Solution
The use of ground anchors and guide brackets for stepwise retention, where H-piles are installed before excavation, vertical ground anchors convert their fixing force into horizontal tensile force, transferring load to H-piles through guide brackets, eliminating the need for separate retention members and allowing multiple steps of retention without occupying additional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional earth retaining methods use struts and rakers to resist earth pressure, then the retaining strength is improved, but the device complexity and material quantity increase significantly
Solution Approach 1:
The patent combines the retaining function and anchoring function into a single ground anchor system. The ground anchor installed at an inclination angle provides both the anchoring force to prevent wall movement and the retaining force to resist earth pressure, eliminating the need for separate struts and rakers. This merging of functions reduces device complexity while maintaining retaining strength.
Solution Approach 2:
The ground anchor serves multiple functions simultaneously: it acts as an anchoring element to secure the retaining wall, provides active retention against earth pressure through its inclined installation, and reduces the overall number of components needed. This multi-functionality directly addresses the contradiction by maintaining strength while reducing device complexity.
2Reliability
If struts and rakers are installed at intervals of 2-3 meters vertically, then the retaining coverage is improved, but the ease of operation decreases due to narrow work space
Solution Approach 1:
The patent extracts the need for frequent vertical installation of retention members by using a continuous inclined ground anchor system. Instead of installing discrete struts and rakers at 2-3 meter intervals, the inclined ground anchor provides continuous retention along its length, eliminating the need for frequent interventions and improving ease of operation while maintaining reliable coverage.
3Strength
If earth anchors are anchored 10 meters or more into adjacent site, then the anchoring strength is improved, but the adaptability decreases when adjacent site use is restricted
Solution Approach 1:
The patent changes the installation dimension from horizontal (anchoring into adjacent site) to inclined (anchoring at an angle within the same site). The ground anchor is installed at an inclination angle of 15-45 degrees, allowing it to achieve sufficient anchoring strength by extending deeper into the ground at an angle rather than horizontally into restricted adjacent areas. This dimensional change provides adaptability when adjacent site access is limited.
4Productivity
If multiple retention steps are implemented in narrow urban spaces (back site 1 meter or less), then the productivity is improved, but the device complexity increases due to space constraints
Solution Approach 1:
The patent employs a dynamic retention system where the inclined ground anchor can accommodate multiple excavation steps. As excavation progresses in steps, the inclined anchor maintains its effectiveness by providing retention force at different depths along its length. This dynamic adaptability allows multiple retention steps to be implemented without increasing device complexity, as the single inclined anchor system naturally adapts to the stepped excavation profile.
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 method enables safe, low-cost, and efficient deep excavation by preventing H-pile collapse without separate retention members, even in narrow urban spaces, minimizing material installation and shortening construction time while maintaining retention force across multiple excavation steps.
Implementation Method 1
by using the fixing force from vertical ground anchors installed before excavation, the support force from the vertical ground anchors can be converted into a horizontal tensile force
Data Source
AI summary
A provisional facility for retaining earth using a guide bracket and a ground anchor for stepwise retention during deep excavation includes multiple thumb piles disposed vertically at predetermined intervals, a wale disposed across the multiple thumb piles, a guide bracket installed at a predetermined position of the wale, and a ground anchor having the other side anchored to a ground while a tensile member is wound around the guide bracket.