Self-Supporting Concrete Slabs Without Temporary Backshoring
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Solution Overview
Problem
Traditional construction methods for multi-floor buildings require extensive temporary shoring, such as backshoring and reshoring, which are time-consuming and disrupt construction progress due to the need for leave-outs and additional supports, leading to delays and increased labor and material costs.
Innovation Solution
The implementation of self-supporting concrete slabs using reinforced steel bars arranged to span the entire length and width of the slab, connected via splicing devices, allowing the slabs to support their own weight and additional loads without temporary shoring during construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional backshoring and reshoring methods are used during concrete floor construction, then structural support is provided during construction, but construction time increases and productivity decreases due to the need for extensive temporary shoring and sequential floor access
Solution Approach 1:
The concrete floor slab is designed to be self-supporting during construction through integrated reinforcement bars (rebars) that provide tensile strength while the concrete provides compressive strength. This self-service mechanism eliminates the need for external temporary shoring systems, allowing the slab to support its own weight and construction loads independently, thereby resolving the contradiction between structural reliability and construction productivity
Solution Approach 2:
The invention combines concrete (providing compressive strength) with steel reinforcement bars (providing tensile strength) to create a composite structural system. This composite material approach enables the floor slab to achieve sufficient structural integrity to support itself during construction without requiring additional temporary supports, thus eliminating the time-consuming shoring and reshoring processes while maintaining structural reliability
2Ease of manufacture
If traditional pour strips with leave-outs are used, then concrete placement is simplified, but extensive temporary shoring is required at regions near pour strips, increasing device complexity and labor costs
Solution Approach 1:
The invention extracts and removes the temporary shoring system from the construction process entirely. By designing the concrete floor slab with integrated reinforcement that provides self-supporting capability, the need for external shoring devices is completely eliminated, thereby reducing device complexity while maintaining ease of concrete placement through traditional pour strip methods
3Reliability
If more shores are installed as additional floors are added vertically, then structural support is maintained, but labor and material costs increase
Solution Approach 1:
Each concrete floor slab is designed as a self-supporting structural element with integrated reinforcement. This self-service capability allows each slab to support vertical loads from upper floors without requiring additional temporary shores, thereby maintaining structural reliability while eliminating the need for increasing numbers of shores as the building height increases, thus reducing both labor and material costs
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
Eliminates the need for temporary shoring, streamlines construction processes, reduces labor and material costs, and accelerates project completion by enabling early access to lower floors, while maintaining structural integrity and compliance with building codes.
Implementation Method 1
a first set of reinforcing steel bars at least partly embedded within the first concrete body; a second set of reinforcing steel bars at least partly embedded within the second concrete body
Implementation Method 2
a first concrete body having a weight; a second concrete body
Data Source
AI summary
Self-supporting concrete slabs can eliminate the need for temporary backshoring, streamlining the building process and enhancing productivity. These slabs are engineered to support their own weight and additional loads without relying on external supports, reducing labor and material costs while accelerating construction schedules. The process incorporates advanced reinforcement techniques, including post-tensioning and code-compliant splicing methods, to ensure structural integrity, continuity, and compliance with building codes. By simplifying forming processes and enabling early access for other trades, self-supporting slabs offer significant economic and operational advantages, making them a superior alternative to traditional slab designs.