Portal Arch Wall Formwork Trolley for Small-Section Tunnel Lining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The construction of secondary lining in small-section tunnels is hindered by narrow working spaces and the difficulty in simultaneous operation of conventional formwork trolleys, especially in tunnels with special-shaped sections, leading to inefficient construction processes.
Innovation Solution
A rapid construction method utilizing a device comprising a steel bar transport vehicle, wheel type dump truck, customized inverted arch formwork, self-propelled gantry crane, electric flat car, portal arch wall formwork trolley, and concrete pump truck, allowing for sequential steel bar binding, inverted arch construction, and synchronized arch wall pouring from the far end to the near end, with adjustable and mechanized equipment for efficient space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional formwork trolleys are used for secondary lining construction in small-section tunnels, then the construction process can be completed, but multiple trolleys cannot operate simultaneously due to narrow working space
Solution Approach 1:
The tunnel construction is divided into multiple working sections (first working section, second working section, etc.) with each section having its own dedicated formwork trolley. This segmentation allows multiple trolleys to operate simultaneously in different sections without interfering with each other, resolving the space constraint issue while maintaining high construction efficiency.
Solution Approach 2:
The invention introduces a spatial dimension solution by dividing the tunnel into multiple longitudinal working sections. Instead of trying to fit multiple trolleys in a single narrow section, the system creates multiple parallel working zones along the tunnel length, enabling simultaneous operations without lateral interference.
2Manufacturing precision
If one-time full-section pouring construction is used for special-shaped section tunnels, then complete coverage is achieved, but construction difficulty increases significantly
Solution Approach 1:
The special-shaped section tunnel is divided into multiple working sections, each with its own formwork trolley configured for the specific geometry. This allows each section to be constructed with optimized formwork fitness while reducing the overall construction complexity compared to attempting a single complex full-section pour.
Solution Approach 2:
Each working section is equipped with formwork trolleys specifically configured for the local geometric requirements of that section. This localized customization allows each section to achieve optimal formwork fitness for its specific shape and size, rather than using a one-size-fits-all approach that would increase overall complexity.
3Length of moving object
If narrow working space is accepted in small-section tunnels, then tunnel section size is maintained, but construction operation becomes difficult
Solution Approach 1:
The tunnel is segmented into multiple working sections along its length, with each section providing sufficient working space for its dedicated formwork trolley. This segmentation allows the tunnel to maintain its small overall section size while providing adequate operational space at each working zone, resolving the contradiction between compact tunnel design and construction accessibility.
Data Source
AI summary
A rapid construction method for a secondary lining of a small-section tunnel includes steps of: transporting and store secondary lining steel bars to a designated position in the tunnel with a steel bar transport vehicle and a wheel type dump truck; after the tunnel is cleaned, simultaneously constructing the secondary lining from two ends to a middle of the tunnel; constructing a lower inverted arch with a customized inverted arch formwork and then constructing an upper arch wall with a plurality of portal arch wall formwork trolleys; wherein the portal arch wall formwork trolleys form a set, and are connected by hinges, so as to construct in a curve tunnel. The rapid construction method has a long single construction section, and procedure connection is compact, thereby realizing rapid and efficient construction of the secondary lining.