Planning agency: International Highway Construction Corporation
Implementing agency: Kyokuto Kaihatsu Co., Ltd.
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.
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.
| ２-１ 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. |
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| ２－２ Equipment specification |
2-2-1 Mine car hoist |
１) 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 |
| ２) rope tension |
P=W¹(sinθ+μcosθ)+W²(sinθ+μ′cosθ)=20700(sin14°02′+1/60cos14°02′)+3885(sin14°02′+1/10cos14°02′)=5430+1320=6750≒6800kgf . |
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| ３) motor output |
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| ４) rope safety factor |
 Rope diameter used: φ25 (tough rope)Breaking force used: BS=50.1 tf |
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| ５) driving |
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. |
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| 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 |
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| ２) rope tension |
P=W¹(sinθ+μcosθ)+W²(sinθ+μ′cosθ)=2070+1013=3083≒3100kgf. | ||
| ３) motor output |
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| ４) rope safety factor |
 Rope diameter used: φ22 (tough rope)Breaking force used: BS=38.5 tf |
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| ５) driving |
Basically the same as a mine car hoist |
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| 1) Electric capacity | ① Compressor | 150kw | |
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| 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.
*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.
Overview of the Japan-Korea tunnel
