The Cutter Head Drive Theoretical Model of a New Multi Dual-Eccentric Axes Tunneling Shield Driven by Hydraulic Cylinders Directly

Abstract:

Based on work principle analysis of a new multi dual-eccentric axes tunneling shield, the advantages of adapting well to large diameter long distance tunnel and energy saving are showed in detail. Then, the cutter head drive theoretical model driven by a single hydraulic cylinder is analyzed, the expressions of driving force and hydraulic cylinder flow are set up, they all vary with the position changing of the cutter head. On this basis, the multi cylinders drive theoretical model is obtained by superposing the expressions of each cylinder. Subsequently, the relationships between working pressure, system flow and cutter head rotating speed under the working conditions of constant torque, constant flow and constant rotating speed are analyzed. The analysis results show that the working pressure and system flow are fluctuating when the cutter head rotating speed maintains constant, and the cutter head drive system is of constant power, and this is also the actual work condition of the shield. At the same time, each hydraulic cylinder stroke remains determined phase matching relationships. Finally, as the example with five cylinders driving, the matching relationships of the hydraulic cylinder strokes are discussed.

• Periodical: Applied Mechanics and Materials (Volume 741)
• Pages: 586-593
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.741.586
• Online since: March 2015
• Authors: Hua Geng Wang*
• Keywords: Cutter Head, Cylinder Stroke Matching Relationship, Multi Dual-Eccentric Axes, Theorectiocal Model, Working Principle

References

[1] Lv Jianzhong, Shi Yuanqi. Development of the pipe jacking system of multi eccentric axes type with rectangular cross section 4m×6m[J]. The latest technique of the city transportation tunnel engineering - Shanghai International Symposium on Tunnel Engineering 2003. Shanghai. Tongji University Press, 2003: 354-369. (in Chinese).

DOI: 10.29252/jafm.11.01.27715

[2] U. Maidl. Design features of the Botlek rail tunnel in the Betuweroute. Tunneling and Underground Space Technology[J]. April-June 1999, 14(2): 135-140.

DOI: 10.1016/s0886-7798(99)00027-9

[3] G. Girmscheid and Cliff Schexnayder, F. ASCE. Tunnel Boring Machines. Practice Periodical on Structural Design and Construction[J]. 2003, (8): 150-163.

DOI: 10.1061/(asce)1084-0680(2003)8:3(150)

[4] Huageng Wang, BaoFu Xu. Work principle and mathematics description of a new dual-frequency hydraulic hammer [J]. Fluid Power Transmission and Controls, 2005(5): 4-7(in Chinese).

[5] Yongxiang Lu, editor in chief. Hydraulics and Pneumatics Handbook [M]. Beijing: Mechanical Industry Press, 2003: 470-587. (in Chinese).

[6] Wang Huageng. Research of Structural Optimization and control of Cutter Body System of Shield Driven by Cylinder Directly: [doctor's degree dissertation][D]. Shanghai: Institute of Mechanical Engineering of Tongji University, 2007：48-77. (in Chinese).

[7] K. Mori, and Y. Abe. Large rectangular cross-section tunneling by the multi-micro shield tunneling (MMST) method. [J]. Tunneling and Underground Space Technology, 2005, 20(2): 129-141.

DOI: 10.1016/j.tust.2003.11.012

[8] M.A. Meguid, O. Saada, M.A. Nunes and J. Mattar. Physical modeling of tunnels in soft ground: A review[J]. Tunneling, 2008, 23(2): 185-198.

DOI: 10.1016/j.tust.2007.02.003