Hanoi-Vietnam: Minimum area of the underground roadway system used for practical test

11:47, 11/07/2024

On August 1, 2018, the Vietnam Ministry of Labor, Invalids and Social Affairs issued Circular 06/2018/TT-BLDTBXH regulating the list of facilities and equipment for the assessment of national vocational skills for the professions of Underground Mining Engineering, Underground Mine Construction Engineering, and Underground Mine Electromechanical Engineering at vocational skill levels 1, 2, and 3.

Circular 06 sets forth the standards for the minimum area of the underground roadway system used for practical tests in Vietnam as follows:

No.	Name	Unit	Quantity	Basic Technical Requirements	Notes
1	The floor area of the practical assessment area	m^2^	8,000	Includes all constructions used during the assessment period and auxiliary services.
2	Roadway system	m	508	- Designed and approved by a legally authenticated agency (unit authorized to design the mine) solely for skill assessment and vocational training; - Underground mining sites that are currently in production, temporarily halted, or have ceased production cannot be used for practical examination.	Continuous connection
	Including the following roadways
2.1	Main transport roadway	m	50	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + S_sd ≥ 9.5 m^2^; + B ≥ 3,800 mm + H ≥ 2,900 mm	Figure 1
2.2	Main ventilation roadway	m	50	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + Ssd ≥ 9.5 m^2^; + B ≥ 3,800 mm + H ≥ 2,900 mm
2.3	Inclined roadway	m	40	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + Ssd ≥ 6.8 m^2^; + B ≥ 2,600 mm + H ≥ 2,000 mm + Slope 10° ≤ α ≤ 35°	Figure 2
2.4	Three-way branching roadway	m	40	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + Ssd ≥ 9.5 m^2^; + B ≥ 3,800 mm + H ≥ 2,900 mm
2.5	Station chamber	m	50	- Constructed with reinforced concrete, thickness of 0.3 m. + Ssd ≥ 4.5 m^2^; + B ≥ 2,200 mm + H ≥ 2,300 mm	Figure 3
2.6	Straight roadway section supported by frames	m	50	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + Ssd ≥ 6.8 m^2^; + B ≥ 2,600 mm + H ≥ 2,000 mm
2.7	Inclined roadway section supported by frames	m	50	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + Ssd ≥ 6.8 m^2^; + B ≥ 2,600 mm + H ≥ 2,000 mm + Slope 10° ≤ α ≤ 35°
2.8	Vertical shaft roadway section	m	10	- Shaft diameter ≥ 4 m - Constructed with reinforced concrete, thickness of 0.3 m: + Base height 0.5 m + Shaft body height 8.2 m + Shaft collar height 0.8 m - Equipped with full machinery for lifting, ventilation, drainage, and signal systems	Figure 4
2.9	Roadway section supported by anchors	m	30	- Constructed with double-layer reinforced concrete, thickness between layers ≥ 1.6m. - Supported by arch-shaped frames: + Ssd ≥ 9.0 m^2^; + B ≥ 3,500 mm + H ≥ 2,950 mm	Figure 5
2.10	Reinforced and restored supported section	m	30	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + Ssd ≥ 9.5 m^2^; + B ≥ 3,800 mm + H ≥ 2,900 mm - Roof hollow length ≥ 3m
2.11	Gas explosion incident handling section	m	30	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + Ssd ≥ 9.5 m^2^; + B ≥ 3,800 mm + H ≥ 2,900 mm
2.12	Roadway section excavated by Combain machine	m	30	- Constructed with reinforced concrete, thickness of 0.3 m. - Supported by arch-shaped frames: + Ssd ≥ 9.5 m^2^; + B ≥ 3,800 mm + H ≥ 2,900 mm
2.13	Mining roadway supported by single columns and articulated beams	m	15	- Dimensions (length x width x height) ≥ (15.5 x 5.8 x 2.58)m; reinforced concrete construction. - Slope 7° ≤ α ≤ 18°	Figure 6
2.14	Mining roadway supported by the hydraulic movable prop (XDY)	m	15	- Dimensions (length x width x height) ≥ (15.5 x 5.8 x 2.58)m; reinforced concrete construction. - Slope 7° ≤ α ≤ 18°
2.15	Mining roadway supported by the hydraulic movable frame (ZH, chain frame)	m	15	- Dimensions (length x width x height) ≥ (15.5 x 5.8 x 2.58)m; reinforced concrete construction. - Slope 7° ≤ α ≤ 18°
2.16	Drilling face	m	3	- Constructed with reinforced concrete, thickness of 0.3 m. + Ssd ≥ 4.5 m^2^; + B ≥ 2,200 mm + H ≥ 2,300 mm	Figure 7
3	Electrical system	HT	1
3.1	Transformer station	Station	1	- Capacity ≥ 200 KV - Primary/secondary voltage 22/0.4 KV
3.2	Diesel generator station	Station	2	- Capacity ≥ 200 KVA - Voltage 380/220
3.3	Electricity supply system for underground equipment	HT	2	- Three-phase isolated neutral, non-grounded. - Explosion-proof rubber cables.
3.4	Cutting device for each load	Unit/load	02	- Explosion-proof automatic circuit breaker or explosion-proof starter with capacity suited to the load's power and voltage. - ExdI explosion-proof rating
3.5	Personal lighting lamps	Unit	100	- Voltage: 3.7 v - Operation time > 11 hours
4	Ventilation system	HT	1
4.1	Main ventilation fan	Unit	2	- N ≥ 11 KW - Voltage 380/660 V - Q ≥ 130 m^3^/s - dB (A) ≤ 91 - Efficiency (%) ≥ 80 - ExdI explosion-proof rating
4.2	Local ventilation fan	Unit	2	- N ≥ 2.2 KW - Voltage 380/660 V - Q ≥ 5.2 m^3^/s - ExdI explosion-proof rating - Overall useful efficiency coefficient KDP (%) ≥ 64. 64.
4.3	Main ventilation station	Station	1	- Dimensions (length x width x height) ≥ (5 x 3 x 2.2) m; reinforced concrete construction. - Slope ≤ 7°
5	Water pumps	Unit	2	- N ≥ 4.5 KW - Voltage 380/660 V - Q ≥ 30 m^3^/h - ExdI explosion-proof rating
6	Underground transport system	HT	1
6.1	Mine car track	m	60	- B ≥ 600 mm - P 18 rail, wooden or concrete sleepers - NO618 - 1/2-4 switching track
6.2	Mine car	Unit	2	- Capacity ≥ 1000 cm^3^
6.3	Material transport car	Unit	2	- Dimensions (2500 x 1,200 x 1,000)m
6.3	Transport winch	HT	1	- Capacity > 10 tons/hour - Pulling force: ≥ 150 kN - Transport distance > 10 m - ExdI explosion-proof rating
6.4	Mano winch	Unit	2	- Pulling force: ≥ 10 kN - Transport distance > 30 m - ExdI explosion-proof rating
6.5	Battery electric locomotive	Unit	4	- Weight 2500kg - Voltage 48V - Dimensions 2150x920x1460 - ExdI explosion-proof rating
6.6	Battery pack	Unit	8	- Voltage 48V - Capacity 330 amps/hour - ExdI explosion-proof rating
6.7	Battery charger cabinet	Unit	4	- Input voltage AC - 660/380V - Output voltage DC71V - Electric current 90A - ExdI explosion-proof rating
7	Compressed air supply system	HT	1
7.1	Air compressor station	Station	1	- Length x Width x Height: (2.5 x 4.5) - Solid reinforced concrete base
7.2	Air compressor	Unit	2	- N ≥ 11 KW - Q = 5m^3^/min - P = 7 atm - Ex explosion-proof rating
8	Fire prevention equipment
8.1	Sand container	Container	02	Standard type
8.2	Powder fire extinguisher	Unit	10	According to Vietnamese standards (TCVN) on fire prevention
8.3	Foam fire extinguisher	Unit	10	According to Vietnamese standards (TCVN) on fire prevention
9	Underground lighting system	HT	1
9.1	Lighting transformer	Unit	4	- Capacity ≤ 4KVA - Voltage 380,660/133V - ExdI explosion-proof rating
9.2	Explosion-proof lighting lamp	Unit	50	- KBB explosion-proof type - Voltage 127V; capacity 60W - ExdI explosion-proof rating
10	Automatic gas monitoring system	HT	1
10.1	Central cabinet	Unit	2	- Voltage 220-280VAC - Measurement channels: max 40 - Connects to CPC-2 & TC-100/P sensors
10.2	Gas sensors	Unit	10	- Voltage 12 VDC - Imax 40mA - Measurement range: 5% and 100% - Resolution 0.01% for 5% range and 1% for 100% range - Explosion protection type: ExiaI.
10.3	Wind sensors	Unit	10	- Voltage 18 VDC - Electric current 1 ÷ 5mA - Wind speed measurement range 0.3 ÷ 5m/s

Circular 06/2018/TT-BLDTBXH takes effect from September 15, 2018.

- Thanh Lam -

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underground roadway system used for practical test
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Minimum area

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