Hydraulic Floor Slab Lifting With Free-Base Guided Columns
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Solution Overview
Problem
Conventional methods for lifting and lowering floor slabs in prefabricated residential buildings require rigid fixation of lifting columns to the foundation, which is complex, time-consuming, and costly, and often results in column jamming and structural damage due to misalignment and lack of rigidity.
Innovation Solution
A method where lifting columns remain free on the foundation, using guiding structures and sliding assemblies in the floor slabs to maintain vertical alignment, combined with self-climbing hydraulic jacking systems and precise connection techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lifting columns are rigidly fixed to the foundation, then stability and vertical alignment are improved, but construction time and complexity increase significantly
Solution Approach 1:
The lifting columns are pre-assembled with floor slabs at ground level, forming complete stories before lifting. This preliminary assembly eliminates the need for time-consuming on-site column alignment and fixation, as columns are already positioned and connected to slabs in the controlled factory environment
Solution Approach 2:
Hydraulic jacks serve as intermediary devices between the pre-assembled column-slab units and the foundation. These jacks temporarily support the lifted stories during the lifting process, eliminating the need for rigid column-to-foundation connections during construction while maintaining stability
2Manufacturing precision
If lifting columns are rigidly fixed to the foundation, then vertical alignment is improved, but device complexity and cost increase
Solution Approach 1:
Vertical alignment is achieved during factory pre-assembly of column-slab units, where precise positioning can be performed under controlled conditions. This eliminates complex on-site alignment procedures and reduces the need for sophisticated adjustment mechanisms
Solution Approach 2:
The lifting mechanism uses standardized, repeatable connection details between columns and floor slabs that are pre-designed and pre-assembled. This standardization simplifies the lifting mechanism by eliminating the need for complex custom fabrication and alignment procedures
3Stability of the object's composition
If lifting columns are made rigid, then stability during lifting is improved, but adaptability and ease of operation worsen
Solution Approach 1:
The system transitions from static rigid column fixation to dynamic hydraulic support. The hydraulic jacks provide adjustable, controllable support that adapts to the lifting process requirements, allowing for controlled movement while maintaining stability throughout the lifting operation
Solution Approach 2:
The hydraulic jacking system serves multiple functions: supporting the lifted stories, enabling controlled lifting, and providing temporary stability during the lifting process. This multi-functional approach replaces the need for rigid, specialized column-fixation structures
Data Source
AI summary
The provided is a hydraulic mechanism for lifting and lowering floor slabs that operates by assembling (combining) the upper stories at a low elevation (above ground floor slab level), then lifting them to the designed elevation by means of specialized lifting devices. The provided includes a combination of features, including: building columns serving as lifting columns, with their lower ends remaining free on the foundation during the lifting process; guiding structures for the lifting columns, including column openings formed in the floor slabs, the shapes and dimensions of which correspond to those of the columns; and sliding assemblies between the columns and the column openings, configured to guide and maintain the columns in a vertical position throughout the lifting process.