Indicator for Coal industrial standard of PRC MT146.2 Resin anchor bolt part 2: steel bars and accessories.
Many people don’t know what is MT. “MT” is the acronym of “Mei Tan” in Chinese language, which means “Coal”.
3 types of resin rock bolts:
headed twist bar
ribbed bars with non-longitudinal ribs
fully ribbed bars
Technical requirements:
1. Appearance
without serious corrosion, no oil or greasy dirt at anchoring portion.
2. Mechanical Properties
Yield strength of Rebar rock bolt should be at lest more than 335MPa, and left-hand non-longitudinal rebar will be a better choice. Right-hand or continuously ribbed rebars are also acceptable.
If choose round rebar, its dimensions, yield strength, tensile strength should follow GB1499.1;left-hand non-longitudinal rebar, right-hand continuously ribbed rebar should follow GB1499.2.
Elongation after fragile should be at lest 15%.
3. Tolerance
Straightness ≤2mm/m
length L ±10mm
Threaded part length L2 ±5mm
4.Nut
Nut should be in accordiance with GB/T 6170, GB/T 3098.2
5.Washer
Size of washer should be at least 100mmX100mm, or φ100mm
6. Anchoring Strength
Anchoring strength should be more than 1.2 times of bar’s standard yield strength.
Contact: [email protected]
Post time: Mar-15-2019