受限空间内盾构始发反力架受力特性及设计优化
张习颖1张亚洲1姚占虎2樊振宇3徐云龙1王晟4
Stress Characteristics and Design Optimization of Shield Initial Reaction Frame in Confined Space
ZHANG Xiying1ZHANG Yazhou1YAO Zhanhu2FAN Zhenyu3XU Yunlong1WANG Sheng4
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作者信息:1.1.中交隧道工程局有限公司，211106，南京
2.2.中交一公局集团有限公司，100024，北京
3.3.上海东杜岩土科技有限公司，200092，上海
4.4.上海市政工程设计研究总院（集团）有限公司，200092，上海
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Affiliation:1.CCCC Tunnel Engineering Company Limited, 211106, Nanjing, China
2.CCCC First Highway Engineering Group Co.,Ltd., 100024,Beijing, China
3.Shanghai Doondo Geotechnical Technology Co., Ltd., 200092,Shanghai, China
4.Shanghai Municipal Engineering Design Institute (Group) Co., Ltd.,200092,Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.016
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］鉴于盾构隧道在空间受限环境下的始发作业中，反力架的尺寸受到严格限制，为确保能够承受大直径盾构机始发时产生的巨大反力，并有效控制受力变形，特提出研究设计一种具有足够强度和刚度，同时结构紧凑、适应空间受限环境的反力架。［方法］以上海机场联络线工程JCXSG-8标段为背景，针对反力架尺寸受限的实际情况，深入研究了不同后靠支撑方式下反力架的受力与变形特性。通过优化反力架的局部构造和传力撑的布置形式，提出了改进方案，并结合现场实际施工条件进行了验证，以确保设计的合理性和有效性。［结果及结论］在反力架后靠设置中，采用剪力墙相较于斜撑更为优越，能有效提升结构稳定性。此外，在下斜梁增设中支座，显著减小了下斜梁端支座的弯矩，进而有效降低了底梁和竖框梁的扭矩，提升了整体结构的承载能力。同时，上斜梁上传力撑的数量及其布置方式对反力架的最大弯矩和变形具有显著影响。本工程实际施工中，采用了1m厚的反力架，并在其后靠位置设置了900mm厚的剪力墙，同时在反力架下斜梁上增设了支座，并适当减少了上斜梁上传力撑的数量。
Abstracts:
［Objective］ The size of the reaction frame is strictly constrained in shield tunnel initial operation under limited space environment. In view of this, to ensure the frame can withstand the huge reaction force generated during the start-up of the large-diameter shield machine and effectively control the stress deformation, it is proposed to study and design a reaction frame with sufficient strength and stiffness, compact structure, and adaptability to space-limited environments. ［Method］ Taking the JCXSG-8 section of Shanghai Airport Link project as the background, the stress and deformation characteristics of the reaction frame under different back-support modes are studied in depth in terms of the actual situation of limited reaction frame size. Through optimizing the local structure of the reaction frame and the layout of the force transmission support, an improvement scheme is proposed and verified in combination with the actual construction conditions on site to ensure the rationality and effectiveness of the design. ［Result & Conclusion］ In the setting of the reaction frame back-support, the use of shear walls is superior than the diagonal braces, and can effectively improve the structural stability. In addition, adding middle supports to the lower inclined beam significantly reduces the bending moment of the lower inclined beam end support, thereby effectively reducing the torque of the bottom beam and mullion beam, and improving the load-bearing capacity of the overall structure. At the same time, the number and arrangement of force transmitting struts on the upper inclined beam have a significant influence on the maximum bending moment and deformation of the reaction frame. In the actual construction of this project, a 1-m-thick reaction frame is used with a 900-mm-thick shear wall setting up in its back-support position. At the same time, a support is added on the lower inclined beam of the reaction frame, and the number of force transmitting struts on the upper inclined beam is appropriately reduced.
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