Axial pull-out test device and method for all-terrain bolt

Abstract

An all-terrain bolt axial pull-out test device, comprising an adjustable support, a drawing connector, a bolt puller, and a pull rod; the adjustable support includes a bearing plate, and a telescopic support is hinged at the lower end of the bearing Legs, one end of the telescopic link is hinged to the telescopic outrigger, the other end is hinged to the bearing plate, the load plate, the telescopic link, and the telescopic outrigger form a stable triangular structure; the anchor rod passes through the funnel-shaped guide tube directly and vertically The bearing plate is connected with the anchor rod puller or the anchor rod is connected with the pull rod through the drawing connector, and the pull rod vertically passes through the load plate and is connected with the anchor rod puller. The invention provides an all-terrain bolt axial pull-out test device, which can complete pull-out tests of various forms of anchor rods under various terrain conditions.

Description

technical field [0001] The invention relates to a pull-out test device, in particular to an all-terrain bolt axial pull-out test device. Background technique [0002] In the process of bolt pullout resistance test, there are many factors that will lead to deviations in the detection results. One of the most important reasons is that the angle between the loading axis of the hollow jack and the axis of the anchor rod occurs, resulting in the detection result being always greater than that of the anchor rod. The actual axial force, the larger the included angle, the larger the deviation of the result. There are several main reasons for this deviation. One is that the designed inclination angle of the bolt itself is changeable, and there are almost 360° ranges such as uptilt, dip, horizontal, and vertical. Second, the position of the bolt is different. , There are different forms such as slope surface, cavern side wall, roof arch, etc. Third, the exposed surface is changeable,...

AI Technical Summary

Problems solved by technology

The current method is to put a steel backing plate before installing the hollow jack of the bolt puller to increase the bearing area of ​​the exposed surface during the loading of the bolt and reduce the influence of local deformation. However, due to the unevenness of the exposed surface and the The loading plane perpendicular to the anchor rod axis cannot be accurately found within the coverage of the backing plate, and the force and deformation are inconsistent during the loading process. It is always impossible to ensure that the steel backing plate is perpendicular to the axis of the anchor rod. Pulling under the steel backing plate to increase the spacer to get as close to the vertical as possible, the experimental process is cumbersome, the pretreatment period is long, and the result is still not guaranteed to be accurate and reliable

[0003] Anchor rods can be designed in various forms according to different design positions and functions, such as straight rod type, L-shaped, hook type, etc. The L-shaped also has the problem of different bending angles. The current pull-out test of the anchor rod cannot be directly pulled. For the pullout test, the conventional method is to weld or lengthen the bolt with a straight threaded thread sleeve for the exposed and short bolts that do not have the pulling conditions. The drawing test is carried out after direct drawing or welding lengthening according to the length of the exposed straight section. After the test is completed, the cut-off part is welded back. For those that do not have welding conditions, an identical anchor rod is replaced directly next to it, so that It is time-consuming and labor-intensive, and usually on-site welding, cutting, thread rolling and other operating conditions are very limited, and the quality of work cannot be effectively guaranteed

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