A method for treating gobs with steel pipe columns

Abstract

The invention discloses a steel pipe column treatment gob zone construction method. According to the method, a steel pipe column is dropped down into a gob zone, concrete is cast in the steel pipe column to form an anchor plug with rock around, and thus a bearing short column is formed, and the purposes that continuous deformation of the gob zone is prevented or reduced and then an upper building is deformed are met. In case of gob zone treatment at a water source, concrete is cast into a steel tube, then original hydrologic conditions are not changed, disturbance and pollution to underground water are minimized, the problems of long column buckling stability and negative friction to columns, which are resulted when steel pipe columns penetrate through a gob zone, are solved by using steel pipe column anchor plugs between the top plate and the bottom plate of the gob zone in a support manner, and the steel pipe column anchor plugs are relatively reasonable in stress and relatively high in stability; compared with common grouting treatment, the method is capable of greatly reducing the treatment area of the gob zone, the material quantity is reduced, the cost is reduced, and the construction efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of goaf treatment, and in particular relates to a method for treating goafs with steel pipe columns. Background technique [0002] The goaf refers to the mining space formed underground after the underground resources are extracted. After the underground resources are extracted, the original stress balance state around the cavity is destroyed, causing stress redistribution, and the overlying rock mass in the goaf gradually According to the degree of deformation and damage of the overlying rock mass, it can be roughly divided into "caving zone", "fault zone" and "bending zone". Deformation development, when it spreads to the surface, the surface moves and deforms. According to the rate of surface movement and deformation, it is divided into "initial period", "active period", "decay period", and "residual deformation period". When construction activities are carried out on the goaf, the structures on it will ...

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Problems solved by technology

[0004] In the process of grouting to treat gobs, there are disadvantages such as large amount of construction work, long construction period, low rate of grout firming, and certain impact on the underground environment.

There is also a treatment method of using steel pipe piles to pass through the goaf and filling the steel pipe with concrete. The management idea is equivalent to the micro-pile passing through the goaf to a certain depth of the floor, and the upper load is transmitted through the pile to the side wall of the pile and the pile. However, as the depth of the goaf increases, the pull-down load added to the steel pipe pile by the rock and soil around the steel pipe pile will greatly increase, and the stability and bearing capacity of the pile body will be greatly reduced, and will increase the construction cost and difficulty

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