External port free-style convergent instrument and its measuring method

Abstract

The invention discloses an external port free type convergence instrument and a measurement method thereof. The external port free type convergence instrument mainly comprises a deep anchoring base rod, multiple sections middle connection rods and an external port free rod, wherein the deep anchoring base rod is in threaded connection with the middle connection rods; the multiple sections of middle connection rods are connected with one another end to end; the number of middle connection rods is determined by the depth of a hole; and the external port free rod is connected to the last middle connection rod at the aperture of the hole. The rod bodies are anchored into a drilled hole after being sequentially connected and fastened; the aperture is wedged by a wedged guide indication disk, and the external port free rod is exposed at a certain length; the reading of a scale on the surface of the external port free rod, which is pointed by the outer edge of the wedged guide indication disk, is read as an initial value and then regularly read; and at the end of observation, the surface convergence amount of an alley during observation is obtained by subtracting the initial reading from the last reading of the scale on the surface of the external free rod. The external port free type convergence instrument has the advantages that structure is simple, use is convenient, accuracy is high, measurement is continuous and can be repeated, the influence on production is little, and the like.

Description

technical field [0001] The present invention relates to a free-type convergent instrument at the outer port and its measurement method, especially suitable for measuring the displacement of the roadway surface and the relative deformation of a specific area inside the surrounding rock, and also suitable for measuring the relative deformation of a specific area inside the surrounding rock, such as the expansion deformation of the anchorage area, etc. . Background technique [0002] Coal mine roadway is an important underground running channel and working space, and its stability directly affects the normal production of the mine and the life safety of workers. At present, my country's coal mine mining roadways are basically bolt support. Compared with traditional shed support, bolt support is a concealed project, internal damage is not easy to show, and roof fall accidents are sudden, so daily roadway support must be carried out. Surrounding rock deformation monitoring is use...

AI Technical Summary

Problems solved by technology

[0003] The surface displacement of the roadway is the core content of the deformation monitoring of the surrounding rock in the coal mine roadway. The measurement methods generally include "cross" section, "牧" section, "well" section, etc. The measurement tools mainly include steel tape measure, measuring rod, measuring gun, Convergence meter, tower ruler, laser rangefinder, etc., but the existing measurement tools and methods are all working in the roadway, which has a great impact on the normal passage and work of the roadway; the protection of the measuring station is difficult and the reliability is low; the measurement is time-consuming and labor-intensive. The workload is large; the process is greatly affected by human factors, the repeatability is poor, and the accuracy is difficult to guarantee; it is difficult to measure in large-scale equipment areas or roadways with high wind speed; the measured data is the relative deformation of the roof, floor and two sides, and the measurement point cannot be measured The absolute deformation amount; the measuring station is destroyed after the roadway expansion, and the continuous observation before and after the expansion cannot be realized

Therefore, it is no longer suitable for engineering environments and conditions such as large deformation, soft surrounding rock, and deep roadways to carry out observations using fixed measuring points in the surrounding shallow surrounding rock.

[0004] However, there is still a lack of a set of surrounding rock deformation observation equipment and methods that have little impact on construction, are convenient to measure and read, have strong repeatability, and have high precision.

The existing problems in the measurement and reading accuracy of the existing observation methods have affected the collection of on-site basic data, limited the grasp of the deformation laws of surrounding rocks, and hindered the further development of roadway support technology

Images