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Talk about the key function of the hollow grouting bolt

Talk about the key function of the hollow grouting bolt

  • Categories:Industrial News
  • Author:
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  • Time of issue:2020-08-25 09:34
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(Summary description)The effect of hollow grouting anchor rod in practical activities, in the slab rock layer, the hollow grouting anchor rod suspends the unstable rock layer below the stable rock layer at the upper end.

Talk about the key function of the hollow grouting bolt

(Summary description)The effect of hollow grouting anchor rod in practical activities, in the slab rock layer, the hollow grouting anchor rod suspends the unstable rock layer below the stable rock layer at the upper end.

  • Categories:Industrial News
  • Author:
  • Origin:
  • Time of issue:2020-08-25 09:34
  • Views:
Information

  The effect of hollow grouting anchor rod in practical activities, in the slab rock layer, the hollow grouting anchor rod suspends the unstable rock layer below the stable rock layer at the upper end. The tensile force of the hollow grouting bolt comes from the suspended rock layer. In a thin rock layer without a stable rock layer, after the hollow grouting bolt is comfortably installed, the clamping force of the hollow grouting bolt will increase the sliding friction between the sides.

Hollow grouting anchor

  This kind of sliding friction can prevent the rock layer from dragging along the direction again, and then the multiple thin rock layers are clamped into a thicker rock layer through the hollow grouting bolt. The large stress and strain force in this type of thick rock beam is inversely proportional to the thickness of the square meter of the beam. The thicker the integrated rock beam, the smaller the large stress and strain force.

  In addition, the compressive strength of the hollow grouting bolt itself also improves the overall bending resistance of the beam. Hollow grouting bolts form the basic principle of arching. When the prestressed steel hollow grouting bolts are installed in the soft rock fracture zone of the coal roadway, the compressive stress spread by the cone method will be formed on both sides of the rod. If the hollow grouting bolt group is arranged along the cast-in-situ slab, the compressive stress cones composed of each hollow grouting bolt will be staggered to form a pressure-bearing arch that prevents diffusion outside the fracture zone.

  This supply can accommodate the axial load released by the crushed rock at its upper end. The pre-tightening force along the radial direction of the hollow grouting anchor rod causes the in-situ stress in the axillary angle in the constituent arch, which significantly improves the in-situ stress of the pressure-bearing arch, and changes the condition of soft rock from biaxial and biaxial to triaxial force. In that way, a continuous bearing area with a narrowed mean value can be formed in the soft rock, and the bearing capacity of the arch can be greatly developed.

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