Anchor rod for measuring tunnel floor heave large deformation and method therefor

Abstract

The invention relates to an anchor rod for measuring tunnel floor heave large deformation, which is composed of a tail rod piece, a multi-section middle rod piece and a head rod piece which are connected; wherein the tail rod piece is connected with the tail of the multi-section middle rod piece, the head rod piece is connected with the head of the multi-section middle rod piece. The tail rod piece, the multi-section middle rod piece and the head rod piece of the anchor rod are sheathed and then anchored into drilled holes; the height from the tail rod piece to the tunnel top is measured, tunnel height changes such as excessive tunnel floor heave are measured in real time; after bottom canch cleaning is finished, the rod pieces completely exposed out of the ground are taken down, the remaining rod pieces still have certain length exposed. Length of rod pieces taken down is accumulated and height to the tunnel top is initially measured, thus obtaining tunnel floor heave deflection. The multi-section measuring anchor rod is convenient to follow-up observation and does not affect pedestrians and construction inside the tunnel. The anchor rod can be repeatedly used and the measuring anchor rod dispenses with mounting trays, screw nuts and the like. The anchor rod and the method of the invention feature simple structure, convenient construction, easy maintenance, continuous measurement and high accuracy.

Description

technical field [0001] The invention relates to an anchor rod and a method for measuring the large deformation of the roadway bottom drum, and is especially suitable for measuring the deformation of the bottom of a coal mine roadway after excavation is completed. Background technique [0002] After the excavation of the coal mine roadway is completed, the bottom heave is a common movement method for the deformation of the surrounding rock. Aiming at the deformation of the roadway bottom, at present, the method of "cross" section, multi-point displacement meter or construction floor anchor is used to measure the deformation of the bottom. However, since the values ​​measured by the "X" cross section are the relative movement of the bottom wedge, it is difficult to ensure that the measured data is the absolute bulge of the bottom wedge. In addition, multi-point displacement meters or construction floor anchors are used to undercover in the roadway. After that, the observation...

AI Technical Summary

Problems solved by technology

However, since the values ​​measured by the "ten" cross-section are the relative displacement of the bottom sill, it is difficult to guarantee that the measured data is the absolute swell of the bottom sill; Finally, the observation instrument is difficult to maintain, and because the length of the bolt beyond the roadway floor affects production and threatens the safety of pedestrians, if the exposed part is cut off, it is difficult to ensure the continuity and accuracy of measurement

Images