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(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.
http://www.railroadmachinery.com/productinfo1553
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.
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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