Longitudinal connection effect on initial support steel frames in tunnels—Take the traffic tunnels as examples

Ma, Kaimeng; Zhang, Jichun; Wang, Zhiyong; Feng, Jimeng

doi:10.1016/j.undsp.2021.11.007

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…e purpose of the unmanned workshop is achieved through remote control programming. By optimizing the overall layout and design of the four production lines in a tunnel reinforcement factory, each production line can achieve streamlined operations and overall layout [38,39].…”

Section: Implementation Steps Of Intelligent Production Linementioning

confidence: 99%

Application of Intelligent Technology on Tunnel Steel Structure Factory

2022

Mathematical Problems in Engineering

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At present, the construction of tunnel steel structure factories has been common, but most of them are still on the low end. In addition, the manual processing modes face certain problems, such as high waste rate, low efficiency, and discrete welding of steel components. To address these problems, this paper introduces an intelligent management cloud platform, aiming to realize unmanned control methods and construct an intelligent tunnel steel component processing plant. There are four main production lines in the intelligent steel structure factory. First, an intelligent production line of a tunnel grille arch effectively improves the production efficiency, production quality, and dust removal effect of the grille arch through the automatic welding technology of a reinforcement mechanism-based welding robot. Second, a processing line of a steel pipe for tunnel construction improves the overall processing efficiency, saves costs, and reduces work intensity by using an intelligent numerical control system, a pneumatic clamping device, a plasma cutting hole assembly, and a 360-degree automatic rotation system. Third, an automatic feeding platform of section steel arch production line adopts the six-axis robot sensor clamping connecting plate positioning and six-axis robot sensing three-plane automatic welding system, which not only compensates for the defects of manual production but also realizes the reduction, increases efficiency, and improves welding quality and precision. Fourth, an automatic steel mesh production line saves much labor and enhances site management and production efficiency through vertical and horizontal reinforcement pay-off racks. Overall, in this study, the construction goals of informatization, intellectualization, and personnel downsizing of the tunnel steel structure processing have been achieved.

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Section: Implementation Steps Of Intelligent Production Linementioning

confidence: 99%

Application of Intelligent Technology on Tunnel Steel Structure Factory

2022

Mathematical Problems in Engineering

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“…Guozhong et al [3] explored the issues related to steel arch frame segment connections for tunnel primary support and suggested enhancements for tunnel steel arch frame connections. Ma et al [4] demonstrated that incorporating longitudinal connections in tunnel steel arch frames can reduce plastic and shotcrete damage, thus bolstering the primary support's capacity under comparable stress conditions. Song et al [5] conducted research on I-beam and hollow-pipe string joints through static and cyclic loading tests, offering an in-depth analysis of connection performance and its failure under various loading scenarios.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Folding Arch Frame Joints for Unmanned Arch Erection

Huang,

Li,

et al. 2024

Buildings

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The application of folding arch frames is deemed crucial for unmanned arch frame erection, with the selection of the joint form being a determining factor in the overall mechanical performance of the folding arch frame, particularly in influencing the primary support safety. In light of the geological conditions of the New Wushaoling Tunnel project, three feasible joint forms for folding arch frames were proposed: buckle, adhesive, and interference-fit joints. Numerical simulations were conducted to analyze the arch’s overall mechanical and the joints’ local mechanical performances, aiming to identify the optimal joint form. On-site construction data were collected, and the effectiveness of unmanned arch frame erection was evaluated. The design requirements for the vertical displacement results of the steel arches with different joints were met. The maximum shear stress of the buckled arch frame was found to be the lowest, whereas that of the interference-fitted arch frame was the highest. The local shear stress of the adhesive joints was the lowest, while that of the interference-fit joint was the highest. Considering the material application limitations and calculation results, buckle joints are recommended. Unmanned arch frame erection, compared with manual arch frame erection, can save 66.6% of human resources and reduce the construction time by 33.3% to 50%. Statistical analysis has confirmed that the quality of automated arch construction can be guaranteed.

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“…The initial support of the tunnel should bear all the surrounding rock loads at the early stage, and its stress characteristics are correlated with the safety of the tunnel construction period and the load distribution of the subsequent secondary lining. The initial support of the tunnel is the key stress structure in the tunnel support system [11,12]. The existing research has achieved fruitful results in the interaction relationship of support surrounding rock, as well as in the analysis and evaluation of support stress.…”

Section: Introductionmentioning

confidence: 99%

Research on the Stress Characteristics of Initial Tunnel Supports Based on Active Load Adjustment

Chen

Fang

2022

Applied Sciences

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Initial tunnel support takes on a critical significance in the stability control of surrounding rocks and the core content of tunnel support design. Its stability and safety are essential to the tunnel. The support load was optimized using the active surrounding rock load intervention scheme in accordance with the section form and bearing characteristics of the support structure. The optimization scheme of active surrounding rock load was obtained by applying active intervention load to the initial support of the tunnel to minimize the peak moment of the support structure. An active adjustment system for tunnel-surrounding rock loads was developed using the function of hydraulic load transfer and transmission combined with load proportion control. Based on the actual project, the implementation effect of the surrounding rock load active intervention scheme was verified by analyzing the measurement results of the supporting structure in the test section and the comparison section. The results suggest that the application of active intervention load can effectively improve the stress state of the tunnel initial support structure, significantly reduce the tunnel surrounding rock bias pressure and the structural peak bending moment, and increase the stability of the support structure. To control the peak moment of the supporting structure, an active intervention method and its implementation scheme for the stress of the tunnel supporting structure were proposed, which reduces the deficiency in which the conventional supporting structure can only passively bear the deformation pressure of the surrounding rock, effectively improves the stress state of the supporting structure, and can provide a reference for the development of novel tunnel supporting forms.

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Longitudinal connection effect on initial support steel frames in tunnels—Take the traffic tunnels as examples

Cited by 6 publications

References 19 publications

Application of Intelligent Technology on Tunnel Steel Structure Factory

Application of Intelligent Technology on Tunnel Steel Structure Factory

Mechanical Properties of Folding Arch Frame Joints for Unmanned Arch Erection

Research on the Stress Characteristics of Initial Tunnel Supports Based on Active Load Adjustment

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