Segmented Pressure Pipe Anchor for Temporary Ground Support
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Solution Overview
Problem
Existing pressure pipe anchors for temporary construction measures pose challenges in easy assembly and minimal disruption during subsequent construction work, as they either require complex assembly or leave large, disruptive remnants in the subsoil due to their design.
Innovation Solution
Designing pressure pipes with predetermined breaking points along their longitudinal axis, such as reduced pipe wall thickness or perforations, to facilitate easy destruction and minimize disruption while maintaining force absorption capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure pipes are designed as solid rigid bodies for stable force absorption, then anchor stability is improved, but assembly complexity and installation time increase
Solution Approach 1:
The pressure pipe is segmented into a first pressure pipe section and a second pressure pipe section that can be separately assembled and then connected together. This segmentation allows for easier handling and installation while maintaining the structural integrity needed for force absorption. The anchor body is divided into modular components including pressure pipe sections, connection elements, and anchor feet that can be assembled sequentially.
Solution Approach 2:
The anchor tension member is nested within the pressure pipe, which itself is nested within the borehole. The connection element is inserted through the first pressure pipe section into the second pressure pipe section. This nested arrangement allows compact assembly while maintaining the required structural strength for anchor stability.
2Reliability
If pressure pipes are designed as large solid structures for force absorption, then anchor stability is improved, but disruption to subsequent construction work increases
Solution Approach 1:
The pressure pipe is divided into multiple separable sections that can be easily removed and fragmented after the anchor tension member is extracted. The connection element allows for clean separation of the pressure pipe sections, reducing large solid remnants in the subsoil that could disrupt subsequent construction activities.
Solution Approach 2:
The pressure pipe sections are designed as temporary structures that serve their function during anchor installation and tensioning, then can be discarded or removed after the anchor tension member is extracted. The modular design facilitates easy removal and fragmentation of these temporary components to minimize long-term disruption.
3Strength
If pressure pipes are made with uniform wall thickness for structural integrity, then force absorption capacity is improved, but ease of destruction after use deteriorates
Solution Approach 1:
The pressure pipe features localized wall thickness variations with thickest sections at the ends for maximum force absorption capacity, and thinner intermediate sections that are easier to break apart after use. This non-uniform wall thickness distribution optimizes both structural integrity during service and ease of destruction after extraction.
Solution Approach 2:
The wall thickness parameter of the pressure pipe is varied along its length to achieve different mechanical properties in different zones. The end sections maintain high thickness for strength, while intermediate sections have reduced thickness to facilitate easy breaking and removal after the anchor fulfills its temporary purpose.
Data Source
Figure 1
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AI summary
The pipe (20) has an anchoring tendon (3) inserted into a borehole (2) in an underground (7) and anchored with an anchor foot (19) in a borehole base (18). An anchor head construction (11) clamps the anchoring tendon to an air-sided end of the borehole. The anchoring tendon is surrounded in a region before the anchor foot, where the pressure pipe is provided in force-fit connection with a borehole wall by a grouted body (22). A predetermined breaking point extends along longitudinal direction (4) of the pressure pipe that is made of brittle material, cast iron, glass, ceramics or concrete.