Lateral Bracing in Ultra-Deep Silt Foundation Pits
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Solution Overview
Problem
Traditional construction methods for lateral bracing in ultra-deep foundation pits with thick silt layers are inefficient and unsuitable, as they do not effectively address the low bearing capacity of silt, leading to instability and deformation issues during excavation and construction.
Innovation Solution
A construction device comprising a first-layer lateral bracing member with reinforcement cages and angle steels, connected to an enclosing structure, and a suspension rope system with saddles, slings, and length regulating members, which allows for modular assembly and disassembly, providing a stable and efficient construction surface for deep foundation pits with low silt bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional reinforced concrete lateral bracing construction method is used, then construction process is simple for high bearing capacity soil, but it is not suitable for ultra-deep foundation pit with thick silt layer having low bearing capacity
Solution Approach 1:
The invention changes the construction parameters by using pre-assembled steel bracing structures instead of traditional reinforced concrete, and by changing the soil treatment parameters through ground improvement techniques before installation. This allows the system to adapt to low bearing capacity silt conditions while maintaining structural reliability.
Solution Approach 2:
The invention employs composite construction methods combining steel bracing members with ground improvement techniques (such as soil cement or stone columns) to create a composite support system that is suitable for soft silt conditions, thereby improving both adaptability and reliability.
2Ease of manufacture
If traditional construction method is used in ultra-deep foundation pit with thick silt layer, then construction process may be simplified, but construction quality and stability during excavation cannot be ensured
Solution Approach 1:
The invention divides the lateral bracing system into modular segments that can be pre-assembled and then installed as complete units. This segmentation maintains construction simplicity while ensuring quality through factory-controlled assembly and standardized installation procedures.
Solution Approach 2:
The invention performs preliminary ground improvement and pre-assembles bracing structures before installation in the foundation pit. This preliminary action ensures that when construction occurs in the difficult silt conditions, the quality and stability requirements are already met through pre-prepared components and treated ground.
3Ease of operation
If traditional reinforced concrete lateral bracing is constructed, then construction process is straightforward for accessible locations, but construction efficiency and speed are reduced in ultra-deep foundation pit
Solution Approach 1:
The invention segments the bracing system into modular units that can be pre-assembled above ground and then rapidly installed in the foundation pit using cranes. This maintains operational ease through standardized components while dramatically improving construction speed by eliminating in-situ concrete pouring and reinforcement tying.
Solution Approach 2:
The invention replaces the traditional mechanical system of on-site reinforced concrete construction (formwork, reinforcement tying, concrete pouring, curing) with a mechanical lifting and installation system that uses cranes to install pre-assembled steel bracing structures, thereby significantly improving productivity.
4Quantity of substance
If conventional construction method is used, then material requirements are standard, but construction time and cost increase for ultra-deep foundation pit with silt
Solution Approach 1:
The invention uses segmented modular bracing units that are pre-assembled and then installed, reducing on-site construction time while maintaining controlled material consumption through standardized components and reduced waste from pre-fabrication.
Solution Approach 2:
The invention enables continuous construction by pre-assembling multiple bracing units before pit excavation and then installing them sequentially as excavation progresses, eliminating downtime between construction stages and reducing total construction time while optimizing material usage.
Data Source
AI summary
A construction device and method for a lateral bracing in an ultra-deep foundation pit with silt includes a first-layer lateral bracing member, a plurality of suspension rope systems and construction operation plates. The first-layer lateral bracing member is connected with the enclosing structure of the foundation pit. The suspension rope systems include saddles, slings and joists. The saddles are connected with the first-layer lateral bracing member, and the construction operation plates are connected with the joists.