Rock bolt is a kind of slender rod which goes deep into rock and soil and controls the deformation of rock and soil. It can include backing plate, nut and other parts.  Do you know the bearing principle of hollow rock bolt? hollow rock bolt for sale.

1. In layered rock stratum, the anchor rod suspends the unstable rock stratum at the lower part on the stable rock stratum at the upper part.  The tensile force of anchor rod comes from the suspended rock stratum.  In the thin rock stratum without stable rock stratum, the clamping force of anchor rod will increase the friction force between strata, which can prevent the rock from sliding along the strata, thus locking several thin rock strata into a thick rock stratum by anchor rod.  The maximum bending stress and strain in the thick rock beam are inversely proportional to the square of the beam thickness. The thicker the integrated rock beam is, the smaller the maximum bending stress and strain will be.  At the same time, the strength of the anchor itself also increases the overall shear capacity of the beam. hollow rock bolt for sale.

2. Based on the principle of bolt combined arch, when prestressed bolt is installed in the fractured zone of surrounding rock of arched roadway, compressive stress distributed in the form of round cone will be formed at both ends of the rod body.  If the bolt group is arranged along the roof, the compressive stress round cone formed by each bolt will be staggered and overlapped, forming a bearing arch to prevent the fracture zone from spreading, which can bear the radial load exerted by the broken rock on its upper part.  The pre-tightening force along the axial direction of the bolt produces circumferential stress in the composite arch, which obviously improves the stress state of the bearing arch and changes the state of surrounding rock from uniaxial and biaxial to triaxial compression.  In this way, a uniformly compressed continuous bearing area is formed in the surrounding rock, thus greatly improving the bearing capacity of the composite arch. hollow rock bolt for sale.

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