Hardened residual ore heap roadway advance support method

Abstract

The invention relates to a hardened residual ore heap roadway advance support method. The method comprises preparation work in an early stage of construction, and further comprises the following process steps and conditions that a, rectangular section support is carried out, specifically, a section of an ore removal roadway is changed from a three-centered arch into a rectangle, n-shaped supportsare erected, then leg protection anchor rods are arranged at 1.5 m positions of n-shaped support columns, then corresponding inter-row connecting rods are arranged between corresponding cross beams ofeach n-shaped support and the corresponding n-shaped support located behind the same, finally planks are laid on the inter-row connecting rods, and then wall thickness filling is carried out; and b,anchor rod advance support is carried out, specifically, lengthened shank connecting sleeve self-propelled hollow anchor rods are used for the advance support, the upper edges, close to a tunnel face,of the n-shaped support cross beams serve as fulcrums, the lengthened shank connecting sleeve self-propelled hollow anchor rods with column-tooth-shaped drill bits are inserted into a residual ore heap at intervals one by one at an external insertion angle of 10 degrees to 15 degrees, and an inclined-row umbrella-shaped supporting arch is formed at a tunnel vault. The method has the advantages that loosening and collapsing of the residual ore heap in front of a tunnel arch and the tunnel face can be effectively controlled, rapid one-time advance support construction in uneven hard rock mediaof the residual ore heap is achieved, construction is convenient, the cost is low, and good economic effects can be brought, and the method is suitable for being applied to the mining and metallurgy industry.

Description

technical field [0001] The invention relates to a large-diameter deep hole two-step stope residual ore pile roadway advance support, in particular to a sulfur-containing hardened residual ore pile and a similar heterogeneous hard rock medium roadway advance support method. Background technique [0002] In the prior art, the mining method of large-diameter deep hole followed by backfilling of copper mine is to divide the stope into mine room and ore pillar for two-step mining: one step is to return to the mining room, and the second step is to return to the mining pillar. When the two-step stope is mined, the ore passage and approach must be arranged in the filled one-step stope. The ore types of copper mine are mainly copper-sulfur ore and copper-zinc-sulfur ore, the Platts coefficient is between 8 and 9, the ore is strong, the ore contains high sulfur, and the average grade of S is 37.9%. The ore blasted first in the first-step stope will accumulate in the bottom structure...

AI Technical Summary

Problems solved by technology

The first blasted ore in the first-step stope will accumulate in the bottom structure for a long time, and then oxidized and compacted, resulting in difficulties in ore extraction. As a result, when the second-step stope is mined, the ore must go through the medium of the residual ore pile

[0003] The three-core arch section is adopted, and the bulk medium on the arch slides to the sides of the arch foot under the action of gravity, and the arch powder continues to fall and pour into the roadway from the arch foot, which affects the formation and cleaning of the roadway section; due to the residual ore The heap is a mixture of fine ore, lump ore and filling. During the excavation of the section, the residual ore on the roof pours into the roadway, which often leads to the collapse of the roof bulk, making roadway construction and roadway formation difficult.

Although personnel in the field can pass through the residual ore pile by using the pipe shed method, the medium of the residual ore pile is loose, and there are problems such as easy hole collapse and seamless steel pipe can not be pushed in; in order to solve these problems, some people use "advanced drill pipe", It can solve the problem of hole collapse, but the cost is high, and the cost of advanced drill pipe support accounts for 60% to 70% of the total support cost; some people use the "self-advancing hollow grouting" integrated drilling, grouting, anchoring and other functions. "Slurry anchor rod", which is a threaded seamless steel pipe, which is used in conjunction with the YT28 drilling rig through the shank connecting sleeve. Problems such as collapsed holes, inability to insert rods, etc., and lower material costs, but when encountering hard lumps or rocks during the drilling of residual ore piles, the torque of the hollow bolt body increases, and the shank connecting sleeve and the hollow bolt will be separated. Plastic deformation occurs, so that it is difficult to unload the shank connection sleeve. If pipe wrench is used to unload, it will seriously affect the construction efficiency under the condition of high-altitude operation

Images