Luoyang Xinben Machinery Co., Ltd.-bolt supporting mechanism

　　1. Suspension function: The anchor rod hangs the weak rock layer on the firm and stable rock layer to prevent the layer from falling off. The direct roof of the coal seam roadway is generally weak and thin, and it is easy to fall off the layer, while the old roof above it is relatively strong. The anchor rod can reach the old roof through the direct roof and anchor the direct roof on the old roof. From 1952 to 1962, Louis A. Panek and others published the suspension theory. The suspension theory believes that the role of bolt support is to suspend the weaker rock layer of the roadway roof on the upper stable rock layer. Luoyang Machinery Co., Ltd. Yan present for the disclosed layered rock mining tunnel, the top plate are bent directly sinking deformation tendency, if extruded using anchor timely and suspended roof , the direct and the top plate will not The old top is separated from the layer and even falls off. The suspension effect of the anchor rod mainly depends on the thickness of the suspended rock layer, the number of layers and the relative stiffness and elastic modulus of the rock layer when it is bent, and it is also affected by the length, density and strength of the anchor rod .

　　2. Luoyang Xinben Machinery Co., Ltd.- Combined beam function: In the roof of the layered rock layer, a series of bolts are used to anchor the thin rock within the length of the bolt into a rock composite beam, thereby improving its bearing capacity Ability . Under the same load, the deflection and internal stress of the composite beam are much smaller than that of the uncombined plate beam.

　　3. Luoyang Xinben Machinery Co., Ltd.- Surrounding Rock Reinforcement: The rock in the deep surrounding rock of the roadway is under triaxial compression, while the rock near the periphery of the roadway is under the biaxial force. The strength is less than the former, so it is easy to damage And lose stability. After the bolt is anchored Roadway surface rock partially restored triaxial stress state, increasing the strength of its own, in addition, the bolt may also increase the cut resistance of the rock face weak force, so that the surrounding roadway difficult Surrounding Damage and instability are called wall rock reinforcement.

　　(4) Luoyang Xinben Machinery Co., Ltd.- Squeezing connection effect: the bolts squeeze the surrounding rock of the roadway, apply prestress to the rock, prevent the cracks from expanding, and can also squeeze and reinforce the loose rock effect. A simple and interesting experiment was done abroad: a rectangular wooden box was filled with small gravel, and they were anchored with a simulated anchor rod. After the anchor rod was tightened, the wooden box was turned over, and the small gravel filled Can't pour out. Through the prestress of the anchor rod, a kind of lateral squeeze friction resistance can be generated between the crushed stones that have no adhesion to each other , which is sufficient to support the weight of the crushed stone itself without falling, as if the crushed stones are connected to each other. It looks the same.