Concrete Anchor Bolts for Coal Mining

Introduction of Concrete Anchor Bolts for Coal Mining

Concrete Anchor Bolts for Coal Mining is a bolting solution for unstable ground conditions such as sand, gravel, silt, and clays, and in soft to medium fractured rock formations.
For projects facing above geo-conditions, hollow bar self-drilling anchor should be considered as the main solution cuz it's designed for optimized installation, tailored to the project's needs.
By drilling a hole in collapsing soil or loose lock, with a sacrificial drill bit an a hollow bar, and after the drilling operation injecting cementitious grout or resin into the hollow bar and surrounding cavity, it's a top solution choice.

Features of Concrete Anchor Bolts for Coal Mining

(1) In the longitudinal direction , rock body has equal tensile strength ,that is about 40% higher than the reverse-twist bolt in the same specification .
(2) Extend the support area , not only be used by end anchoring ,but also be used by fully anchoring ,that has a better support efficiency .
(3)Low price, widely used in coal mines, railways, hydropower and other types of roadway projects.

Parameter of Concrete Anchor Bolts for Coal Mining

Type	METAL BAR Diameter(mm)	anchoring KN
deformed steel bar 6s≥335MPa	φ22	>125
	φ20	>105
	φ18	>85
	φ16	>75
round steel bar 6s≥235MPa	φ22	>90
	φ20	>70
	φ18	>60
	φ16	>50

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