Skid-mounted cold box and its prefabricated structure and assembly method
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Solution Overview
Problem
The existing assembly methods for skid-mounted cold boxes require extensive on-site welding and nondestructive testing, leading to increased costs, operation time, and potential quality issues due to the need for crane usage and overhead work, which affects the efficiency and reliability of the assembly process.
Innovation Solution
The proposed solution involves a prefabricated structure with ring beams and mounting holes for bolts, allowing for the connection of adjacent prefabricated structures through bolts instead of welding, eliminating the need for on-site welding and nondestructive testing, and ensuring the strength and airtightness of the cold box framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If full penetration welding is adopted for joining nodes of prefabricated structures on site, then the connection strength is improved, but the operation time and cost increase due to required nondestructive testing and crane usage
Solution Approach 1:
The cold box structure is divided into multiple prefabricated sections that are assembled on site through bolt connections rather than welding. Each section includes its own support legs and ring beams, allowing independent fabrication and quality control in the factory, then rapid assembly on site through standardized bolt interfaces.
Solution Approach 2:
The patent replaces the welding mechanical process with a bolt connection mechanical system. Instead of using welding equipment and performing nondestructive testing, the invention uses high-strength bolts with washers to achieve both connection strength and sealing function, eliminating the need for complex welding operations and quality inspection processes.
2Strength
If full penetration welding is adopted for joining nodes of prefabricated structures on site, then the connection strength is improved, but the cost increases due to nondestructive testing and crane usage
Solution Approach 1:
The cold box structure is divided into multiple prefabricated sections that are assembled on site through bolt connections rather than welding. Each section includes its own support legs and ring beams, allowing independent fabrication and quality control in the factory, then rapid assembly on site through standardized bolt interfaces.
Solution Approach 2:
The patent replaces the welding mechanical process with a bolt connection mechanical system. Instead of using welding equipment and performing nondestructive testing, the invention uses high-strength bolts with washers to achieve both connection strength and sealing function, eliminating the need for complex welding operations and quality inspection processes.
3Reliability
If on-site welding operations are performed, then the structural integrity is improved, but the quality of welding seams cannot be guaranteed due to overhead work and crane constraints
Solution Approach 1:
All welding operations are performed in advance during factory prefabrication of each section, where optimal working conditions can be maintained. The on-site assembly only requires bolt connections, eliminating the difficulty of performing welding operations overhead with crane constraints.
Solution Approach 2:
The patent replaces the welding mechanical process with a bolt connection mechanical system. Instead of using welding equipment and performing nondestructive testing, the invention uses high-strength bolts with washers to achieve both connection strength and sealing function, eliminating the need for complex welding operations and quality inspection processes.
4Manufacturing precision
If crane is used for lifting and positioning prefabricated structures, then the assembly precision is improved, but the productivity decreases due to crane availability constraints
Solution Approach 1:
The cold box structure is divided into multiple prefabricated sections that are assembled on site through bolt connections rather than welding. Each section includes its own support legs and ring beams, allowing independent fabrication and quality control in the factory, then rapid assembly on site through standardized bolt interfaces.
Solution Approach 2:
Each prefabricated section is equipped with its own support legs that can be independently adjusted and positioned. The sections self-align through the ring beam interfaces, reducing the need for heavy crane operations and allowing parallel assembly work by multiple crews simultaneously.
Data Source
AI summary
The present invention relates to a skid-mounted cold box and its prefabricated structure and assembly method. Each prefabricated structure includes a framework and a first panel that is used to enclose sides of the framework. Ring beams of two adjacent prefabricated structures are connected through bolts on site. A second panel connected through bolts encloses the gap between ring beams of the two adjacent prefabricated structures from sides. The present invention cancels all field welding seams and omits the field welding and nondestructive testing operations. The crane can be dismissed after the upper prefabricated structure of the cold box is lifted into place and bolts corresponding to columns on ring beams are connected. The present invention guarantees the connection strength of steel structures relying on bolt-based connection between ring beams and the second panel connected through bolts guarantees the airtightness of the cold box. This effectively reduces field assembly work and saves time and cost.