Trenchless construction of Phase IIIA District Cooling System (DCS) by TBM pipejacking and hand-dug tunnelling on Kai Tak Development : Part II – The challenges

2019 ◽  
Vol 26 (1) ◽  
pp. 20-29
Author(s):  
Wilson Mok ◽  
Victor Lo ◽  
Germaine Chau ◽  
Louis Lau
Keyword(s):  
Cooling System ◽  
Lower Section ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Bay Area ◽  
Construction Techniques ◽  
Ground Conditions ◽  
Boring Machines ◽  
Trenchless Construction ◽  
To Receive

This paper discusses the challenges of constructing 1.75 km of concrete sleeve pipelines with diameters of 1,200mm, 1,500mm and 2,800mm using slurry operated Tunnel Boring Machines (TBMs) for installing District Cooling System (DCS) pipelines in highly variable ground conditions within the Kowloon Bay area. It covers the problems encountered, solutions provided, and recommendations made. Various construction techniques are also discussed including: running two TBMs in parallel from a jacking pit for the near simultaneous construction of two pipelines; enlarging the lower section of a receiving pit by the caving method to receive the TBM which entered the pit at an oblique angle, for turning inside the pit for removal after skin-off of the TBM; construction of a hand-dug tunnel from a receiving pit to receive three TBMs one at a time in a triangular configuration to suit site constraints. This paper should be read together with Part I which is entitled “Design and Construction Considerations” published in 2017.

SELECTION AND CALCULATION OF CUTTING HEAD FOR EARTH PRESSURE BALANCE TUNNEL BORING MACHINES

2019 ◽  
Vol 4 (1) ◽  
pp. 139-149
Author(s):  
A.V. Polyakov ◽  
◽  
A.B. Zhabin ◽  
P.N. Chebotarev ◽  
W.H. Khachaturian ◽  
...  
Keyword(s):  
Earth Pressure ◽  
Pressure Balance ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Cutting Head ◽  
Ground Conditions ◽  
Earth Pressure Balance ◽  
Boring Machines

Considered selection and calculation of cutting head for earth pressure balance tunnel boring machines. The conditions of choice of the working body are defined. The possible types of cutting heads and the features of choosing the type of their supports and drive mechanisms are described. The dependence for the calculation of the torque on the working body is given. The recommendations on the choice of the degree of openness of the cutting head, the type of destructive tool, expansion devices and seals of the bearing units of the drive of the working body depending on the ground conditions of penetration.

scholarly journals A perspective of pipejacking works by tunnel boring machines in Hong Kong: part I – development, selection of design, operations and types of techniques

2021 ◽  
pp. 108-118
Author(s):  
Wilson W S Mok ◽  
Andrew S W Ng
Keyword(s):  
Hong Kong ◽  
Design Method ◽  
Tunnel Boring Machine ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Ground Conditions ◽  
History Of ◽  
Boring Machines ◽  
And Performance ◽  
Selection Of

In this paper, the history of pipejacking works by tunnel boring machines in Hong Kong, their development, selection of design method and tunnel boring machine (TBM), operations, length and alignment of a pipeline, types of techniques to suit different site constraints and ground conditions, and performance of the works are discussed. This paper should be read together with part II, which covers applications, problems encountered, cost and prospects.

scholarly journals Advancement simulation of tunnel boring machines

2012 ◽  
Author(s):  
Tobias Rahm ◽  
Kambiz Sadri ◽  
Christian Koch ◽  
Markus Thewes ◽  
Markus Konig
Keyword(s):  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Boring Machines

scholarly journals The Preparation of H13 Steel for TBM Cutter and the Performance Test Close to Working Condition

2018 ◽  
Vol 8 (10) ◽  
pp. 1877 ◽  
Author(s):  
Yong Hu ◽  
Jiyu Tian ◽  
Mingxu Xu ◽  
Hongwei Zhao ◽  
Mingze Wang ◽  
...  
Keyword(s):  
Compression Strength ◽  
Performance Test ◽  
Working Condition ◽  
H13 Steel ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Disc Cutters ◽  
Boring Machines ◽  
Full Face ◽  
Tbm Cutter

The material of disc cutters is important to full-face tunnel boring machines (TBM). In recent years, disc cutters were optimized and tested by many scholars all around the world. H13(4Cr5MoSiV1) steel is widely used due to its excellent properties, especially in TBM disc cutters. In this paper, H13 steel with optimized composition was prepared and heat treatment. The high temperature compression of H13 steel was conducted at the temperatures ranging from 100 °C to 700 °C, with strain rate at 0.01 s−1. The stress-strain curves, Rockwell hardness and microstructure of H13 steel after compression were obtained and analyzed. The results showed that the compression strength and hardness decreased as the temperature increased; and the compression strength, hardness and ductility decreased rapidly between 600 °C and 700 °C, HR700 (the hardness of H13 steel at 700 °C) only reached 33.23 HRC. It is not recommended for TBM disc cutters to work in an environment over 600 °C.

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