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Nagoya inclined shaft investigation site for the

Japan-Korea Tunnel, Kyushu Karatsu Investigation Incline Shaft (Phase 1 to 3 Construction Sections)

Japan-Korea Tunnel, Karatsu-Nagoya Investigation Incline Shaft (Plan and Cross Section)

Progress of the Karatsu Incline Shaft Construction Site in Saga Prefecture (PDF, photos)

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

Japan-Korea Tunnel Project, Kyushu Karatsu Investigation Incline, Third Phase Construction Provisional Design Plan Outline

Planning agency: International Highway Construction Agency
Implementing agency: Far East Development Co., Ltd.

1. Equipment overview

After roughly five years since the start of construction of the exploration incline, construction of the first and second phases of the incline is nearly complete, and the project is now approaching the stage for replacing the temporary equipment as originally planned. While the capacity of the temporary equipment for the second phase, particularly the hoisting winches, was designed for an excavation length of approximately 500 meters, the capacity required for the third and subsequent phases of construction will be increased to accommodate the 1,410-meter design incline.
Other improvements include the addition of additional power receiving equipment and expansion of water supply, drainage, air supply, and ventilation systems. Furthermore, as construction continues, new mud treatment facilities and injection equipment will be required. However, if excavation is required to continue for the time being, this is likely possible with only minor modifications to the hoisting winch power receiving equipment and minor additions to other equipment.

2. Changes to the hoisting equipment

The equipment (PUC-20T) for the first 500m of the second phase is as shown below, but as the excavation length increases from the third phase onwards, the equipment specifications will vary significantly.
An overview is given below.

２-１ Basic conditions	Tunnel slope angle:☆　θ＝14°02′ Diagonal shaft length:☆　L¹＝1400m Lifting distance:☆　L²＝1500m Transport weight: mine car 2700kgf/car x 2 cars = 5400kgf Car contents: 1.7tf/m³ x 4.3m³ x 2 = 15,300kgf Pedestrian car: 12-seater Hoisting speed:☆　υ＝150m/min The ☆ mark is common to both the mine cart and the man cart.
２－２ Equipment Specifications	2-2-1 mine car hoist	１) Loading conditions	W¹ Weight of mine car 2700kgf x 2 = 5400kgf Load 1700kgf/m³ x 4.5m³/car = 15300kgf ∴W¹ = 5400 + 15300 = 20700kgf W² Weight of wire rope 2.59kg/m x 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 .
		３) motor output
		４) Rope Safety Factor	Rope diameter: φ25 (tough rope) Breaking strength: BS = 50.1 tf
		５) driving	The operation will be manual from the winding room. However, for certain sections (pit entrance to bottom), the operation will automatically accelerate → full speed → decelerate → stop. Since the face changes as the excavation progresses, the stop switch and overshoot switch will be relocated.
	2-2-2 Handcart hoist	１) Loading conditions	W1 Weight of man/vehicle: 7160kgf (including hanging hardware) W2 Weight of wire rope: 1.99 x 1500m = 2985 kgf
		２) Rope tension	P=W¹(sinθ+μcosθ)+W²(sinθ+μ′cosθ)=2070+1013=3083≒3100kgf.
		３) motor output
		４) Rope Safety Factor	Rope diameter: φ22 (tough rope) Breaking strength: BS = 38.5 tf
		５) driving	Basically, it is the same as a mine car hoist.

3. power equipment

The total power used in this project is 948 kW, but the plant equipment (22 kW) and the sprayer (15 kW) will not be used during excavation. Also, the jumbo drill and the tailings hoist will not be used at the same time, so a contracted power of 700 kW is considered sufficient.

Plan of the investigation inclined shaft construction site in Karatsu, Saga Prefecture (new winch)

Construction site of the investigation inclined shaft in Karatsu, Saga Prefecture (hoisting arrangement diagram)