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In some parts of the anchor drilling machine also known as anchor drilling machine, coal roadway bolting is drilling tools in the work. In improving the supporting effect, reduce support costs, speed up into a lane, to reduce traffic, reduce labor intensity, improve the utilization rate of roadway section and so on has the extremely prominent advantages.
in bedded rock bolt will lower unstable rock hanging out on the upper solid rock. Tensile anchor suffered from hanging out layers
In no thin layers of solid rock, at ease with anchor rod, anchor the friction between the clamping force can make the level of increase, can prevent the friction along the rock level continue to slide, which will be a number of thin layers by bolt locking into a thick layers. The maximum bending stress and strain within the thick YanLiang and beam is inversely proportional to the square of the thickness, the integrated YanLiang more thick, the less the maximum bending stress and strain. At the same time, the strength of the bolt itself also increases the overall shear capacity of the beam
3.anchor combination arch principle, in the shape of roadway surrounding rock fracture zone in the installation of prestressed anchor, on both ends of the rod body will form a conical body form distribution of compressive stress. If arrangement along the roof bolt group, each anchor would crisscross overlap a vertebral compressive stress circle, forming a stop the spread of the rupture zone pressure on the arch, this can stand for the upper broken rock of radial load. Along the axial pre-tightening force of anchor in composite arch ring to the stress and pressure arch is improved obviously by the stress state, the state of surrounding rock by the uniaxial and biaxial triaxial compression. This form a continuous uniform compression in the surrounding rock bearing area, thus greatly improve the bearing capacity of composite arch.
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