Effectiveness analysis of a novel rectangular tunnel boring machine with planetary transmission for box jacking

Traditional rectangular tunnel boring machines have low tunneling efficiency, poor soil mixing effects, which has hindered the construction of long-distance and large-section box jacking projects. To overcome these limitations, a new type of full-face excavation boring machine was developed based on...

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Bibliographic Details
Published in:Scientific reports 2024-11, Vol.14 (1), p.27059-22, Article 27059
Main Authors: Ma, Peng, Zhao, Yahong, Shimada, Hideki, Zhou, Hao
Format: Article
Language:English
Subjects:
639/166/986
639/166/988
Box jacking
Case studies
Civil engineering
Drilling & boring machinery
Efficiency
Excavation
Excavation face stability
Feasibility studies
Full-face excavation
Geology
Humanities and Social Sciences
Methods
multidisciplinary
Planetary transmission mechanism
Rectangular TBM
Science
Science (multidisciplinary)
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Summary:Traditional rectangular tunnel boring machines have low tunneling efficiency, poor soil mixing effects, which has hindered the construction of long-distance and large-section box jacking projects. To overcome these limitations, a new type of full-face excavation boring machine was developed based on a planetary transmission mechanism. This machine achieves full-face excavation by utilizing three eccentric cutter heads that revolve around both the central axis of the cutter plate and their individual shafts. The design methodology, feasibility, and principles of this new mechanism were introduced. Furthermore, a successful construction project of an underground highway passage in Japan was presented as a case study to demonstrate the design and application of this tunnel boring machine. The case details include the excavation face support mechanism, optimal cutter-head layout, obstacle removal strategies, and methods for reducing jacking resistance. Monitoring data from the project verified the applicability, reliability, and overall engineering performance of the rectangular shield machine developed using the planetary mechanism. This research demonstrates that the planetary transmission mechanism-based boring machine offers superior performance in terms of ground settlement and tunneling speed, potentially providing a comprehensive solution to the challenges in the development of rectangular shield machines for box jacking projects.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-024-78206-8