Mine Tunnel Roof Support Self Drilling Rock Hollow Grouting Anchor Bolt

Mine Tunnel Roof Support Self Drilling Rock Anchor Bolt IntroductionConcrete 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.  Mine Tunnel Roof Support Self Drilling Rock Anchor Bolt ParameterTypeMETAL BAR Diameter(mm)  anchoring KNdeformed steel bar 6s≥335MPaφ22>125φ20>105φ18>85φ16>75round steel bar 6s≥235MPaφ22>90φ20>70φ18>60φ16>50dlength1400160018002000220024002600φ16-+++---φ18-++++--φ20--++++-φ22---++++   SPEC. MATERIAL BEARING CAPACITY (kn) HIGH-STRENGTH PLATE(Spherical) SIZE (mm) BEARING CAPACITY (kn) BORE DIAMETER (mm) All-Thread Rebar Rock Bolt DQ-16 HRB335 ≥100 120×120×6 ≥125 23 DQ-18 HRB335 ≥125 120×120×8 ≥170 23 DQ-20 HRB335 ≥155 120×120×8 ≥170 26 DQ-22 HRB335 ≥185 150×150×8 ≥220 26Mine Tunnel Roof Support Self Drilling Rock Anchor Bolt Photos/* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1