Project _

Nagoya investigation site of Japan -Korea tunnel

Japan-Korea Tunnel/Kyushu Karatsu Survey Diagonal (1st to 3rd phase construction section)

Japan-Korea Tunnel/Karatsu Nagoya Investigation Diagonal (Plan/Vertical Section)

History of the investigation slope construction site in Karatsu, Saga Prefecture (PDF/Photo)

  • (From January 1, 2012 to December 31, 2012)
  • Ⅰ. Assets section
  • Ⅰ-1. Current assets
  • Ⅰ-2. Fixed assets
  • II. Liabilities section
  • II-1. Current liabilities
  • Ⅲ. Net assets section

Japan-Korea Tunnel Project/Kyushu Karatsu Survey Diagonal Tunnel Third Phase Construction Temporary Design Plan Outline

Planning agency: International Highway Construction Corporation
Implementing agency: Kyokuto Kaihatsu Co., Ltd.


1. Equipment overview

It has been approximately five years since the construction of the research slope began, and the construction of the first and second phase of the research slope has almost been completed, and we have now reached the stage of temporary equipment replacement as originally planned.
Temporary equipment for the second phase of construction, especially the capacity of winches, etc., is compatible with an excavation length of about 500m, whereas for the third phase and below, the design slope length, temporary materials, etc. from 1,410m are required. This requires a hoisting ability of In addition, plans need to be made to increase power receiving equipment, water supply equipment, drainage equipment, air supply equipment, ventilation equipment, etc. Additionally, along with the extension of construction, it will be necessary to construct new facilities for treating muddy water and injection equipment. However, if excavation is required to continue for the time being, it may be possible to do so by changing the hoisting winch power receiving equipment and adding some other equipment.

2. Changes to hoisting equipment

The equipment (PUC-20T), which is about 500m long until the second stage, is as shown below, but in the third stage and below, as the length of excavation increases, the specifications and conditions of the equipment will differ greatly.
The outline is shown below.

Basic conditions
Tunnel slope angle: θ=14°02′
Diagonal shaft length: L¹=1400m
Hoisting distance: L²=1500m
Transport weight: Mine car 2700kgf/car x 2 cars = 5400kgf
Mine car contents: 1.7tf/m³×4.3m³×2=15300kgf
Carriage: 12 people
Hoisting speed: υ=150m/min

The ☆ mark is the same for both Mineshamaki and Jingurumamaki.

Equipment specification
Mine car hoist
Loading condition
W¹ Mine car weight 2700kgf×2=5400kgf
Load 1700kgf/m³×4.5m³/vehicle=15300kgf
∴W¹ =5400+15300
=20700kgf W² Wire rope weight 2.59kg/m×1500=3885kgf
rope tension
motor output
rope safety factor

Rope diameter used: φ25 (tough rope)
Breaking force used: BS=50.1 tf
Operation is manual from the winding chamber.
However, when operating in a certain section (from the wellhead to the bottom), the process is automatically accelerated, then full speed, then decelerated, and then stopped. As the face changes as the excavation progresses, the stop switch and error switch will be relocated.
2-2-2 Passenger car hoist 1)
Loading condition
W¹ Weight of passenger and vehicle 7160kgf (including hanging hardware)
W² Weight of wire rope 1.99×1500m=2985 kgf
rope tension
motor output
rope safety factor

Rope diameter used: φ22 (tough rope)
Breaking force used: BS=38.5 tf
the same as a mine car hoist

3. power equipment

1) Electric capacity ① Compressor 150kw
②Repair factory 20kw
③Blower 60kw×2=120kw
④Hoisting machine A) 220kw (disposable)
B) 110kw (for passenger cars)
⑤Plant equipment 22kw
⑥ Spray machine 11kw
⑦Jumbo drill 220kw
⑧ Lifting pump 15kw
⑨Lighting power 40kw
⑩Others 20kw
total 948kw


The total electricity used in this construction work is 948kw, but the plant equipment (22kw) and spray machine (15kw) will not be used during excavation. Also, since the jumbo drill and the winding machine will not be used at the same time, the contract power of 700kw is considered to be sufficient.

Cross-sectional view of the investigation slope construction site in Karatsu, Saga Prefecture (newly installed hoisting machine)

*The construction has been completed and one track has been removed.


*Third phase construction site (center is entrance to inclined shaft)


*The shear truck has two upper and lower wheels.


*The white building has a winding machine installed.


Floor plan of investigation slope construction site in Karatsu, Saga Prefecture (newly installed hoisting machine)

Survey inclined shaft construction site in Karatsu, Saga Prefecture (hoisting layout diagram)

  • Nagoya investigation site of Japan-Korea tunnel

  • Overview of the Japan-Korea tunnel

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