A kind of structure design method of expanding and extruding friction anchor rod and cable

Abstract

A method for design an anchor cable structure of expanded diameter extrude friction anchor rod includes such steps as providing design constant resistance require by actual engineering of anchor rod and anchor cable, selecting rod body cable material according to conventional method, and determining rod body cable size; Select the casing and pipe materials according to the conventional method, anddetermine the design range of the casing inner diameter and outer diameter; The material of the tube expander is selected according to the conventional method, and the outer diameter of the big end of the tube expander and the angle between the generatrix and the axis of the tube expander are determined. Calculate the theoretical constant resistance and select the parameters that meet the requirements of constant resistance; According to the actual demand, the design parameters of the expanded diameter extruded friction anchor cable structure are determined to meet the requirements. In the invention, each parameter can be obtained through theoretical calculation, which is convenient to guide the processing design and production of the structure, meets the engineering needs, has high accuracy, is simple and easy to understand, and is convenient to guide the technical personnel in the field to carry out the diameter expansion extrusion friction anchor cable structure design.

Description

technical field [0001] The invention belongs to the field of structural design of anchor rods and anchor cables, and in particular relates to a method for designing the structure of anchor rods and cable by expanding diameter and extruding friction. Background technique [0002] The expanded diameter extrusion friction bolt and anchor cable can effectively solve the support problem under the soft rock condition and the coal rock mass under the action of dynamic load, provide a certain high support constant resistance for the supported surrounding rock mass, and can also pass through The axial slip of the expansion extrusion friction bolt and anchor cable structure cooperates with the supported surrounding rock mass to deform, absorbing a certain amount of impact energy and deformation energy, and ensuring the stability of the supported surrounding rock mass to the greatest extent . [0003] But at present, there is no reasonable, complete and reliable design method for the ...

AI Technical Summary

Problems solved by technology

The existing design of expansion extrusion friction bolt and anchor cable structure often adopts experiment or numerical simulation method. Although reasonable parameters can be obtained, the cost of the experimental method is high, and the experimental results are relatively random. Designers have high requirements and are difficult to be widely used

Therefore, the existing design method is costly and inefficient, and it is difficult to obtain the optimal design parameters of the structure. If a conservative approach is adopted and design parameters with a large safety factor are selected, although the safety of the project can be guaranteed, it will cause serious waste of resources , if some parameters are selected unreasonably, it may even pose a threat to engineering safety

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