SU1744259A1 - Vertical shaft protection method - Google Patents

Abstract

The invention relates to the mining industry and can be used when digging coal safety pillars under vertical shafts. The aim of the invention is to increase the efficiency of application of the method by increasing the carrying capacity of wooden campfire at the initial moment of its loading. The method involves the driving around the lining of the mine shaft of the preparatory development with lining and ring niche and the installation of fire support in it. Between the lower row of the campfire lining bars and the excavation soil 3, the composition expanding during curing is layered with a layer whose thickness is determined from the Rahn mAh ratio m Ah. g, where Ah - the convergence for K due to the irregularities of the roof and soil and the different thickness of the bars; Rnach-force initial thrust; n is the coefficient of proportionality between the lining compliance and the load; k is the coefficient of volume expansion of the composition during curing. 3 il.

Description

The invention relates to the mining industry and can be used in the excavation of safety pillars under the vertical shafts.

There is a method of guarding a vertical shaft when excavating a safety pillar, including the rational planning of mining operations relative to the shaft. The disadvantage of this method is that the lining of the barrel has significant damage at the intersection with the reservoir under development.

The closest in technical essence to the claimed method is the method chosen as a prototype.

guarding a vertical shaft when removing a safety pillar, including making a hole around the shaft, digging an annular recess between the hole and the barrel, cutting the trunk lining and installing a wooden campfire in the niche.

The disadvantage of this method is its low efficiency, since at the initial moment of loading the wooden fire support has a great flexibility due to the unevenness of the roof and the soil and the different thickness of the individual timber support bars and cannot take a heavy load. As a result of this the trunk

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receives significant damage at the initial moment of loading of the fire support.

The aim of the invention is to increase the efficiency of applying the method by increasing the bearing capacity of the support at the initial moment of its loading.

This goal is achieved by the fact that between the lower row of firewall lining bars and the soil is placed an expanding composition during hardening, the thickness of the layer, determined from the ratio

Ah + pR

nach

m to

where Ah is the convergence due to the irregularities of the roof and the soil and the different thickness of the bars;

Rnach - the effort of initial thrust;

n is the coefficient of proportionality between the lining compliance and the load;

k is the coefficient of volume expansion of the composition during curing.

A comparative analysis with the prototype shows that the inventive method differs in that it is due to the laying between the lower rows of the campfire lining bars and the post ring niche that the lining perceives a significantly greater load at the initial moment of displacement of the roof rocks, thereby increasing the efficiency of the method. Thus, the claimed method meets the criteria of the invention of novelty.

When studying other known technical solutions in this field of technology, the features that distinguish the claimed invention from the prototype have not been identified and therefore they provide the claimed technical solution with the criterion of significant differences.

FIG. Figure 1 shows a plan for locating wooden campfire in a niche around the trunk; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a graph of the relationship between the support capacity of the lining and its compliance.

Around the lining 1 (Fig. 1) of the vertical shaft 2, the preparatory development 3 is erected with the lining 4 erected in it, then an annular niche 5 is formed between generation 3 and the lining 1 of the trunk 2 and the trunk lining is cut to a power equal to the thickness of the formation in the niche . On the soil 6 of the niche 5 (Fig. 2) is laid a layer 7 of a composition expanding upon hardening, the thickness of which is found from the condition m Ah + n beg.

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criss-cross village bars 8 campfire lining. The size of the irregularities of the roof and the soil and the difference in the thickness of the lining of roof bars are preliminarily measured, by which the value of the convergence Ah is established.

On the side of the barrel, steel sheets 9 are hung and an anvil ring 10 is installed to prevent rock pieces from erupting into the barrel and disrupting ventilation. As a result of expansion at

As the composition hardens, the thickness of layer 7 increases, bars 8 are compressed, the upper row of bars destroys the protrusions 11 of the roof 12 and is partially crushed by itself, increasing the contact area of the lining with the roof,

As a result, bonfire wood support receives an initial thrust. Due to the obtained initial spreading of the firewood, the lining from the beginning of its installation takes a large load, which is evident from the graph shown in FIG. 3, and prevents damage to the lining of the trunk.

The invention is illustrated by the following example. At the mine to them. 50th anniversary of the October Revolution of Karagandaugol, the safety pillar of the Ki3 formation under the centrally-related trunk is being worked out. Around the trunk 2 (see Fig. 1) with a diameter of 6 m with a concrete support 0.5 m thick prevents ring working 3 with a section of 2 x 2 m with a rounding radius of 6.5 m (along the working axis) and is fastened with wooden frames 4, vzbezhku with a roof tightening (not shown in the drawing). Coal seam between

with annular excavation 3 and lining of trunk 1, they are taken out diametrically opposite inlets 2.5 m wide, and then the trunk lining is cut to a thickness of 1.7 m (the thickness of the Kia formation is removed). After

of this, a layer 7 expanding upon hardening of the composition with a coefficient of bulk expansion K 2 is laid on the soil in niches 5. The thickness of the layer is assumed (at A h 0.08 m and p. Rnach 0.000166 m / kn x 300

cnt 0,05m), equal to 0.065

On a layer 7 of the composition, the cross-bar is laid in ten rows of bars 8 (cross-section 16x16 cm) of fire support. Then, a similar formation is chosen completely between the annular excavation and lining of the trunk and the trunk lining is cut with a ring, ten wooden campfires are erected in a niche in plan dimensions of 2 x 1.5 m and 1.67 m high (taking into account the layer ). After the composition hardens due to its expansion, the wood firewood lining receives an initial thrust force equal to 300 kN

(see Fig. 3) and is capable from the beginning of the process of shifting the rock mass to take a significant load with a certain compliance. A comparison of the mode of operation of the fire support in the proposed method (with the initial thrust) and in the prototype is shown in FIG. 3. Thanks to the initial thrust and the limited flexibility of the fire support in the behind-the-ground method, the trunk is protected from damage. The use of the proposed method, which makes it possible to define an initial strut of wooden lining, increases the efficiency of protection of vertical shafts during the removal of safety pillars.

Claims (1)

The invention of the method of guarding a vertical shaft, including carrying out around it, excavating an annular recess between the mine and the shaft, cutting five 0 The trunk shaft and the installation in a niche of stone wooden fire support, characterized in that, in order to increase the effectiveness of the application by increasing the bearing capacity of the support at the initial moment of loading, a expanding composition hardening with hardening is laid between the bottom row of the fire support bars and the soil. layer determined from the ratio A h + Rnach p ,, where Ah is the convergence due to the unevenness of the roof, the soil and the different thickness of the bars; Rnach - the effort of initial thrust; n is the coefficient of proportionality between the lining compliance and the load; k is the coefficient of volume expansion of the composition during curing. A-A 11 y //////// W // A EE trfto.Јtel H T№ W // y ///////////// FIG. 2  s 0 -I . .,. -with .   " BUT Fig.Z