RU2003809C1 - Arched shield - Google Patents

Abstract

Usage: fastening workings when mining steep coal seams with a thickness of up to 6 m. Summary of the invention: the arched shield contains load-bearing metal arches from special profiles with transverse connections and fences. The arches are longitudinally connected metal ones, the fence is made of flexible overlap. Cross connections are made of the same profile as the arch, and installed above its lower ends at 0.2 - 0.3 of its height. The cross-connection sections at the junctions with the supporting arch are made with the same radius as the arch. The supporting beams can be connected to the longitudinal knives at their vertices. The connection of the supporting beams with the longitudinal ones can themselves be made in the form of threaded brackets and figured planks, copying the cross section of a special profile from which the supporting beams are made 1 zpf-ly, 5 silt

Description

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The invention relates to the coal industry and can be used for treating steep coal seams up to 6 m thick.

Known arched shields by Auth. Mg№ 121750. 152444, 968435, as well as an arched shield (Kurlen 8.M., Zvorykin L.V. and Lebedev A.V. Technologists for shield mining of coal deposits, Novosibirsk: Nauka, СО, 1988, pp. 106-109) adopted as a prototype.

The disadvantage of these arched shields is the limited scope of their application in terms of the thickness of the working formation (up to 2.5 m). When the thickness of the formation increases to 3-4 m, the arches collapse along the strike due to insufficient bearing capacity, they are unbent and the shield face comes into disrepair.

To eliminate these drawbacks, an arch shield has been developed for working out steep formations with a capacity of up to 6 m, including metal arches from special profiles installed in the cross of the strike of the formation, longitudinal metal strips connecting the arches along the strike of the formation and characterized in that, in order to increase the bearing capacity of the arches and expanding the scope of application of arched shields in the direction of increasing the removable capacity of the formation, each arch is provided with a transverse connection made from the same profile and installed above the lower ends of the arches and 0.2-0.3 of its height. In addition, the sections of the transverse connection at the junctions with the supporting arch are made with the same radius as the arch itself, and the connection of the supporting arches with longitudinal connections is made using threaded brackets and figured planks tightly covering the supporting arches.

Figure 1 shows a cross section of a shield; figure 2 is a longitudinal section of a shield; Fig. 3 is the same, plan view; figure 4 - node ne figure 2; figure 5 - section aa in figure 4,

Sectional shield. Each section consists of arches 1 (special profile SVP 22 or 27) installed in the cross of the strike area of the invention.

1. ARCH SHIELD for the development of steep coal seams, including arches of supporting metal beams of special profiles with transverse connections, longitudinal metal strips connecting the arches, and a fence made of flexible metal ceiling, characterized in that, in order to increase bearing capacity of arches and expanding the scope of application in the direction of increasing

one hundred (Figs. 1-3) and connected along a longitudinal strike along 2 along the tops of the arches also from special profiles, and at the roof and soil of the formation, by angles 3. Each arch is provided with a transverse connection 4 represented by the same special profile as the arch. At the junctions with the arch with clamps 5, the transverse connections are bent with a radius equal to the bending radius of the supporting arch, and the transverse

the ties are raised from the base of the arches to 0.2-0.3 of their height. On the side, the section is equipped with aprons b made of sheet iron, on the lying side, each arch is equipped with a slide 7. On a fully mounted shield

(4-5 sections), a flexible metal ceiling is laid, represented by an interlaced strip of iron 8 and a metal mesh 9. Along the perimeter of the shield, a flexible ceiling is attached to the rope 10 connected to the arch supports 11.

To ensure stability, the supporting arches at their vertices are connected by longitudinal beams of special profiles (Figs. 4 and 5) using threaded brackets 12 and curly

strips 13 tightly encircling and sealing the connection of the arches with the longitudinal beams, for which a threaded bracket in each connection passes through only the holes 14 available in the longitudinal beam for each

carrier beam.

The extraction of coal under the shield is carried out by a blasting method in accordance with the generally accepted technological scheme approved in the established order.

The use of this arched shield during mining of a steep coal seam with a thickness of 5 m allows saving up to 50 m of forest materials with a shield length of 24 m. After mining the shield column, up to 50% of the shield elements are dismantled.

(56) 1.Kurlen V.M., Zoorykin D.V. and Lebedev A.V. Coal mining technology. Novosibirsk: Nauka, 1988, p. 106-109.

2.Spivakovsky A.O. and Hoists South. Mobile powered roof supports. M ,: Ugletekhizdat, 1958, p. 23.

power of the developed formation, each transverse connection is made of the same profile as the arch, and is installed above the lower ends of the arch at 0.2 - 0.3 of its height, and the sections of the transverse connection at

The junctions with the supporting arch are made with the same radius as the arch.

2, A shield according to n.t, characterized in that for increasing stability the support beams are connected with longitudinal beams along

to their heights, and the connection of the bearing

beams with longitudinal on themselves made in the form of threaded brackets and curly strips,

copying the cross section of a special profile from which the load-bearing beams are made.

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