Prefabricated Concrete Staircase With Notched Load-Bearing Wall
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Solution Overview
Problem
The installation of heavy, one-piece balanced staircases with a load-bearing wall is challenging due to the need for suitable lifting means, which is difficult to manage, especially in individual house construction sites.
Innovation Solution
A prefabricated concrete staircase design where each step has an upper projection that fits into a notch in the central load-bearing wall, allowing the steps to converge and be secured with reinforcement before concrete is poured, enabling simultaneous assembly and eliminating the need for heavy lifting tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a one-piece balanced staircase with a load-bearing wall is used, then structural stability is improved, but the weight increases to 2,500-3,500 kg requiring heavy lifting means
Solution Approach 1:
The staircase is divided into separate modular components: precast concrete steps and separate load-bearing wall elements. Each step is a complete unit that can be manufactured off-site and assembled on-site without requiring heavy lifting equipment for entire staircase installation.
Solution Approach 2:
The steps are precast with integrated reinforcement and projection elements during manufacturing. The load-bearing wall elements are pre-prepared with notches and reinforcement positions. This preliminary preparation enables rapid on-site assembly while maintaining structural integrity without requiring heavy lifting means during installation.
2Ease of manufacture
If heavy lifting means are provided for installation, then the staircase can be assembled, but the complexity and difficulty of installation increases
Solution Approach 1:
By segmenting the staircase into lighter modular steps and wall elements, the invention eliminates the need for complex heavy lifting equipment. Standard handling equipment suffices for assembling the modular components, dramatically simplifying the installation process.
Solution Approach 2:
The projection elements on steps and corresponding notches in wall elements act as intermediaries that facilitate assembly. These features enable precise positioning and mechanical interlocking of modular components during installation, simplifying the assembly process without requiring complex equipment.
3Stability of the object's composition
If the central wall is constructed before the steps, then the wall structure is stable, but the installation time increases
Solution Approach 1:
The load-bearing wall elements are pre-prepared with notches and reinforcement positioning during manufacturing, rather than constructing the entire wall first. This allows steps to be simultaneously assembled and connected to wall elements, enabling parallel work streams that reduce total installation time while maintaining wall structure stability.
Solution Approach 2:
The wall is segmented into separate elements that can be positioned and connected to steps in an alternating sequence. This modular approach allows simultaneous progression of wall and step assembly, reducing the sequential time loss compared to completing the entire wall first.
4Strength
If the steps are made integral with the central wall, then structural strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The staircase is segmented into separately manufactured steps and wall elements that are later connected through reinforcement and concrete pouring. This segmentation allows each component to be manufactured using optimized, simpler processes while achieving integral strength through on-site connection.
Solution Approach 2:
The connection between steps and wall elements uses composite construction: precast concrete components combined with steel reinforcement and additional concrete pouring. This composite approach achieves integral structural strength while allowing separate, simpler manufacturing of individual components.
Data Source
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AI summary
This prefabricated concrete staircase of the cantilevered type with a load-bearing wall is made up of prefabricated steps converging at a central wall. Each step (3) has, at its point of convergence towards the central wall, an upper projection (6) extending from the tread and part of the riser. The central wall is made up of stacked hollow concrete units (2), the same height as each of the steps (3), and each unit has a notch (5) formed within its defining side wall (4), against which the projection (6) from the corresponding step rests, the notch being offset by one unit from the unit above.