CN102296974B - Quick Maintenance Method for Stope Broken Roof - Google Patents

Abstract

The invention discloses a rapid maintaining method for a broken roof in a stope. The rapid maintaining method comprises the steps of: firstly, designing an anchoring rod drill hole for maintaining the broken roof in the stope; secondly, carrying out canopy guard by adopting a self-drilling anchoring rod in combination with a reinforcing steel bar belt; and during the canopy guard, carrying out anchoring rod depth detection on a pre-drilled drill hole by using a common anchoring rod drill, and then selecting the type of the anchoring rod according to the breaking range of the roof. The invention solves the problems of multiple constructions, high stress, and immediate, rapid and effective maintenance of the broken roof under the condition of large embedding depth.

Description

Quick Maintenance Method for Stope Broken Roof

technical field

The invention belongs to the technical field of mining.

Background technique

Mine mining roof accident is one of the major disaster accidents in mines. With the increase of mining depth and the application of large mining height mining technology, roof breakage often occurs during the mining process, resulting in local or large-scale roof fall accidents, which not only affect production, but also cause safety hazards. Hidden danger. Roof accidents are common in coal mines in my country, including roof accidents during the installation and advancement of mining face equipment, roof accidents during the advancement of tunneling face, and accidents during roadway maintenance. At present, the prevention and control of such accidents is basically the same as the conventional prevention and control methods, mainly adopting artificial filling and temporary support measures. With the increase of mining depth and the popularization and application of mining mechanization at large mining heights, in the specific implementation process of these conventional measures, due to defects such as difficult operation and uncontrollable risks, the downtime of equipment is long, and the treatment of roof fall is not timely, which often leads to secondary problems. This disaster will lead to a vicious cycle of roof control, and it is prone to large-scale roof accidents, resulting in heavy losses. When there are abnormally high stress areas and complex structures in the stope, it is difficult to effectively control the roof caving using the current method, resulting in waste of support materials and labor consumption. Therefore, the broken roof control under the conditions of multi-structure, high stress (when the original rock stress reaches 20Mp), and large buried depth (when greater than 800 meters) needs to invent some fast and effective technical methods, and invent a timely, fast and effective method for the broken roof. Effective maintenance methods are of great significance.

Contents of the invention

The purpose of the present invention is to propose a new, timely and fast effective method for maintaining the broken roof in order to solve the serious problems of untimely prevention and ineffective effect in the control of the broken roof in the multi-structure and high-stress areas of deep mining .

Technical scheme of the present invention is:

Step 1: Design and maintain the anchor drilling for the broken roof of the stope

During the mining process of the working face, when there are areas where roof cracks develop, small-scale fractures, and pressure expansion tend to be obvious, two drill holes are arranged within every 1.4m, the drill hole spacing is controlled at 0.9-1.0m, and the pre-drilling depth is 1.0-3.mm;

Step 2: self-drilling anchor rod with steel bar roof protection

Firstly, use ordinary anchor drilling tools to detect the depth of the anchor on the pre-drilled hole. When the drilling tool reaches a certain depth and it is difficult to drill, it means that the drill hole has entered the complete rock formation, which is the effective depth;

When the span of the broken roof is less than 100 meters and the depth is less than 15 meters, select a self-drilling anchor with a length matching the effective depth as the support anchor, and then use the anchor drilling tool to cooperate with the self-drilling anchor to drill to reach the anchor. After the length is reached, stop drilling, lay the steel bar on the top plate, and expose the end of the self-drilling anchor rod in the steel bar, install a pallet on the end of the anchor bar, and tighten the nut;

When the span of the broken roof is greater than 100 meters and the depth is greater than 15 meters, especially when encountering a structure, select a self-drilling grouting anchor with a length matching the effective depth as the support anchor, and then use the anchor drilling tool to cooperate with self-drilling The grouting bolt is drilled, and when the length of the bolt is reached, the drilling is stopped, the steel bar is laid on the top plate, and the end of the self-drilling grouting bolt is exposed in the steel bar, and a pallet is installed at the end of the bolt , and tighten the nuts; finally, connect the grouting pump through the grouting connection device, and inject grout from the hollow of the self-drilling grouting bolt to the broken roof or fault zone to reinforce the broken roof.

The positive effects of the present invention are: 1. By installing a self-drilling anchor rod in the broken roof and cooperating with a steel bar with a maintenance function, the roof can be actively maintained to effectively prevent the expansion of the roof fall area. 2. Through grouting, the broken roof is reinforced, the strength of the roof stratum is improved, and the broken and fissured rock mass in the deep part of the stope is artificially solidified into a complete rock stratum, which provides a safety guarantee for the advancement of the working face. 3. The steel bar belt has the functions of sealing, bearing and compressing, and plays a protective role on the end face roof of the working face and the roof of the roadway, and protects the workers in the space.

Description of drawings

The implementation of the present invention will be described below in conjunction with the accompanying drawings.

Figure 1 is a top view of the drilling arrangement in the broken roof area of the working face;

Fig. 2 is a schematic diagram of bolt depth detection;

Fig. 3 is a self-drilling grouting anchor structure diagram;

Figure 4 is a structural diagram of the steel bar.

In the figure: 1-drill bit, 2-connecting device 2, 3-middle hole drill pipe, 4-stop grout plug, 5-backing plate, 6-nut, 7-grouting device.

Detailed ways

The inventive method step is as follows:

Step 1: Design and maintain the anchor drilling for the broken roof of the stope

During the mining process of the working face, when there are areas where roof cracks develop, small-scale fractures, and pressure expansion tend to be obvious, two drill holes are arranged within every 1.4m, the drill hole spacing is controlled at 0.9-1.0m, and the pre-drilling depth is 1.0-3.mm. As shown in Figure 1.

Step 2: self-drilling anchor rod with steel bar roof protection

Firstly, the common anchor drilling tool is used to detect the anchor depth in the pre-drilled hole. When the drilling tool reaches a certain depth and it is difficult to drill, it means that the drill hole has entered the complete rock formation, which is the effective depth, as shown in Figure 2.

When the span of the broken roof is less than 100 meters and the depth is less than 15 meters, choose a self-drilling anchor with a length matching the effective depth, install the self-drilling anchor on the supporting drilling tool, and carry out drilling at the designed drilling position. Drill in, reserve the tail end after drilling to the bottom, then lay the reinforcement strip on the top plate, and expose the tail end in the reinforcement strip, install a pallet on the tail end, and tighten the nuts, the structure of the reinforcement strip is shown in Figure 4.

When the span of the roof broken range is greater than 100 meters and the depth is greater than 15 meters, especially when encountering a structure, select a self-drilling grouting anchor with a length matching the effective depth as the support anchor, and then use the anchor drilling tool to cooperate with the self-drilling anchor. Drill the grouted anchor rod for drilling. After reaching the length of the anchor rod, stop drilling, lay the steel bar on the roof, and expose the end of the self-drilling grouted anchor rod in the steel bar. and tighten the nuts; finally, connect the grouting pump through the grouting connection device, and inject grout from the hollow of the self-drilling grouting bolt to the broken roof or fault zone to strengthen the broken roof.

As shown in Figure 3, the self-drilling grouting bolt adopts a combined structural part with a length matching, which is composed of a drill bit 1, a hollow drill rod 3, a connecting device 2, a grout stopper 4, a backing plate 5 and a nut 6; the hollow drill rod is composed of It is composed of multiple sections, connected together by a connecting device, which can be flexibly selected according to the crushing depth of the roof; it is also equipped with a grouting connecting device 7.

Claims (1)

1. rapid maintaining method for broken roof in stope is characterized in that step is as follows:

The first step: the armature boring of design maintenance stope breaking roof

In the working face mining process, top board cranny development, breaking small range of scale occur, when pressure manifests the obvious zone of expansion trend, arrange 2 borings in the length range of every 1.4m, the spacing of wells is controlled at 0.9-1.0m, and pre-drilling depth is 1.0-3.mm;

Second step: automatic anchor pole cooperates the reinforcing bar band to protect the top

Carry out the anchor pole depth finding with the common bolt drilling tool in preboring boring first, creep into more at need when drilling tool creeps into certain depth, illustrate that boring enters complete rock stratum, is effective depth;

When the roof cracking range spans less than 100 meters, the degree of depth less than 15 meters, choose with effective depth and be complementary the self drilling anchor of length as support anchor rod, then adopt Roofbolt drilling rig to cooperate self drilling anchor to creep into, after reaching rock-bolt length, stop to creep into, the reinforcing bar band is routed on the top board, and the self drilling anchor end is exposed in the reinforcing bar band, install pallet in the anchor pole end, and fastening nut;

When the roof cracking range spans greater than 100 meters, the degree of depth greater than 15 meters, choose with effective depth and be complementary the certainly brill grouted anchor bar of length as support anchor rod, then adopting Roofbolt drilling rig to cooperate from boring grouted anchor bar creeps into, after reaching rock-bolt length, stop to creep into, the reinforcing bar band is routed on the top board, and make from boring the grouted anchor bar end and in the reinforcing bar band, expose, install pallet in the anchor pole end, and fastening nut; Connect grouting pump by the slip casting linkage at last, from certainly bore grouted anchor bar hollow slip casting in breaking roof or the fault zone, reinforce breaking roof.

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