Weight and application thereof in determining demoulding time of paste

Abstract

The invention relates to a weight, and belongs to the field of coal mine filling. The weight is characterized by comprising a weight body and a convex block, the convex block is arranged at the bottomend of the weight body and protrudes out of the weight body, the weight of the weight is m kilograms, the surface area of the bottom end of the convex block is s square centimeters, and m / s is equalto 0.6; the invention also provides an application of the weight in determining the demoulding time of the paste, and the method comprises the following steps: vertically placing the weight on the surface of a paste test block which is not demoulded so that the weight of the weight is concentrated on the convex block at the bottom end of the weight, and whether the paste test block reaches the demoulding time is determined according to the deformation condition of the contacted paste test block; paste demolding time can be quantitatively judged by adopting a simple weight structure, errors aresmall, accuracy is high, and the method is simple, rapid and effective.

Description

technical field [0001] The invention relates to the technical field of coal mine filling, in particular to a weight and its application in determining the demolding time of a paste. Background technique [0002] Coal mine filling mining is a kind of filling mining method. Coal mine filling mining can control surface subsidence, protect ground buildings, realize safe mining of "three-down" coal pressing and coal pillars, liberate a large amount of sluggish resources generated by coal mining, and realize mine can Continuous development. The laboratory judges the demoulding time of the paste by simulating the downhole conditions, and prepares paste test blocks with fixed specifications according to industry standards to test the demoulding time. As long as the paste can achieve self-stabilization, it will reach the demoulding time of the pull frame, that is, the actual When the underground filling face reaches the demoulding time, the coal mining can be continued. [0003] In...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the demoulding time of the paste is judged by pressing the surface of the test block with fingers, but due to the different strength of each person, the judgment results are quite different, and the accurate judgment of the demoulding time directly affects the filling quality and project progress , the demoulding is too early, the paste is easy to collapse, and the demoulding is too late, which will seriously affect the progress of the project

[0004] Therefore, there is an urgent need for a specific and quantified method of judging the demoulding time of the paste to solve the problem of large judgment errors that vary from person to person

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