Multi-stage pressure yielding and anti-impact device for anchoring support

A multi-stage pressure yielding and anti-impact device for anchoring support, applied to an anchor cable or an anchor bolt, comprising an anti-impact component, a secondary pressure yielding component, and a primary pressure yielding component, the primary pressure yielding component, the secondary pressure yielding component, and the anti-impact component work in sequence;

• a relationship among a bearing capacity F1 of the primary pressure yielding component, a bearing capacity F2 of the secondary pressure yielding component, and a bearing capacity F3 of the anti-impact component is F3>F2>F1;
• the anti-impact component, the secondary pressure yielding component, and the primary pressure yielding component are arranged in sequence from top to bottom;
• through holes for the anchor bolt and the anchor cable to pass through is concentrically formed in axes of the anti-impact component, the secondary pressure yielding component, and the primary pressure yielding component, respectively;
• the primary pressure yielding component and the secondary pressure yielding component each comprise an outer sleeve, an inner extrusion sleeve, and an expansion platform, and the expansion platform is arranged at a bottom end of the inner extrusion sleeve;
• a buffering and energy-absorbing material filling body is arranged between the outer sleeve and the inner extrusion sleeve;
• an outside diameter of the outer sleeve in the primary pressure yielding component is equal to that of a large-diameter end of the expansion platform in the secondary pressure yielding component, and the outer sleeve in the primary pressure yielding component is pressed against a bottom of the expansion platform in the secondary pressure yielding component;
• and
• the anti-impact component matches the outer sleeve of the secondary pressure yielding component in diameter, and the anti-impact component is welded with the secondary pressure yielding component to form an integrated component.