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 hinder project progress due to the need for leave-outs and additional support structures, leading to delays and increased labor and material costs.
Innovation Solution
The implementation of self-supporting concrete slabs with reinforcing steel bars arranged to span the entire length and/or width, connected via splicing devices, and optionally embedded within a second concrete body, allowing the slabs to support their own weight and additional loads without temporary backshoring during construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional backshoring and reshoring methods are used to support concrete slabs during construction, then structural integrity is maintained, but construction time increases and productivity decreases
Solution Approach 1:
The patent applies preliminary action by installing reinforcement bars and post-tensioning systems into the concrete slabs before they are fully cured and before backshoring would traditionally be required. This advance reinforcement allows the slabs to gain sufficient structural capacity during the curing period itself, eliminating the need for temporary backshoring supports and accelerating the construction schedule while maintaining structural integrity
2Ease of manufacture
If traditional pour strips with leave-outs are used, then concrete can be poured and cured, but extensive temporary shoring is required and construction is delayed
Solution Approach 1:
The patent applies the extraction principle by removing the traditional leave-outs (gaps) between pour strips from the construction process. Instead of pouring concrete in separate sections with gaps that require backshoring, the method uses continuous reinforcement and post-tensioning that allows concrete to be poured continuously across the entire span, eliminating the need for leave-outs and the associated temporary shoring requirements
3Stability of the object's composition
If more shores are installed to support additional floors, then structural stability is ensured, but labor and material costs increase
Solution Approach 1:
The patent applies self-service by designing concrete slabs with embedded reinforcement bars and post-tensioning systems that enable the slabs to support their own weight and the loads of upper floors during construction without requiring external temporary shoring. The concrete structure serves itself structurally through the integrated reinforcement system, eliminating the need for additional shores and reducing both labor and material costs
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.