Sheet Pile Retaining Wall with Flowable Backfill
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Solution Overview
Problem
Current earth retaining systems for embankment widening require massive excavation, costly temporary shoring, and a two-stage process, which is time-consuming and poses risks to existing infrastructure and public safety.
Innovation Solution
A one-step sheet pile retaining wall system with a front face of interlocked corrugated sheet piles and perpendicular fin sheets, using cementitious flowable backfill for pre-stressing and reducing earth pressure, eliminating the need for temporary shoring and massive excavation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If temporary shoring is installed to retain embankment during construction, then embankment stability is improved, but construction time increases and risk to existing infrastructure increases
Solution Approach 1:
The invention merges the shoring function and the final retaining wall function into a single integrated sheet pile structure. The sheet piles serve dual purposes: providing immediate temporary support during construction and forming the permanent retaining wall, thereby eliminating the need for separate temporary shoring installation and removal operations.
Solution Approach 2:
The sheet piles are installed in advance to provide immediate shoring support before the embankment construction begins. This preliminary installation of the final wall structure allows the embankment to be built against it directly, avoiding the need for additional temporary support structures.
2Stability of the object's composition
If temporary shoring is installed to retain embankment during construction, then embankment stability is improved, but cost increases
Solution Approach 1:
The invention merges the shoring function and the final retaining wall function into a single integrated sheet pile structure. The sheet piles serve dual purposes: providing immediate temporary support during construction and forming the permanent retaining wall, thereby eliminating the need for separate temporary shoring installation and removal operations.
3Stability of the object's composition
If massive excavation and select rock/aggregate backfill are used in current earth retaining systems, then embankment stability is improved, but construction complexity and time increase
Solution Approach 1:
The invention changes the material parameter from requiring massive quantities of select rock/aggregate backfill to using conventional backfill materials. The sheet pile structure itself provides the primary retaining function, allowing the use of less expensive, more readily available backfill materials while maintaining embankment stability.
4Stability of the object's composition
If temporary shoring extends below highway level to retain embankment, then embankment stability is improved, but risk of damaging existing infrastructure increases
Solution Approach 1:
The invention merges the shoring function and the final retaining wall function into a single integrated sheet pile structure. The sheet piles serve dual purposes: providing immediate temporary support during construction and forming the permanent retaining wall, thereby eliminating the need for separate temporary shoring installation and removal operations.
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 approach significantly reduces construction time and costs, enhances safety by avoiding damage to existing infrastructure, and provides a stable retaining wall without the need for temporary shoring, while allowing for simultaneous construction and drainage/utility installation.
Implementation Method 1
the cementitious flowable backfill in its initial fluid state will serve to prestress the wall system including face and fins
Implementation Method 2
in its set state will help reduce overall pressure acting on the wall face
Data Source
AI summary
A one-step sheet pile retaining wall system for embankment widening typically associated with highway widening not requiring temporary shoring. The wall system may provide a front wall face having a plurality of resistance fins perpendicularly extending therefrom. The fin sheet piles first include a brace fin sheet for reducing stresses in the front wall face, then a series of cradle fin sheets terminating at an elevation below the brace fin sheet for accommodating a pipe drainage/utility cradle, and finally a series of predominantly resistance fin sheets terminating at an elevation above the cradle fin sheets. Between the slope of the existing embankment and the higher front wall face may be cementitious flowable backfill for pre-stressing the wall system when fluid and, when set, supporting the aforementioned cradle, from which the remaining construction can build off of while reducing overall earth pressure acting on the wall face upon completion of construction.