SU899992A1 - Flexible integral shield for mining steep beds - Google Patents

Description

(54) FLEXIBLE FORMULATED SHIELD FOR DEVELOPMENT OF LAYING FALLING PLATES

one

The invention relates to mining, in particular, to the construction of flexible sectionless shields, and can be used in the development of powerful steeply dipping coal seams with dip columns in a mechanized method of coal extraction under shield overlap.

Flexible non-sectional shields are known for developing thick steep dip coal seams consisting, for example, of two rows of edged logs stacked one on top of the strike of the formation and connected into composite beams and a single structure with metal strips covering the top and bottom of the shield 1.,

The closest in technical essence and the achieved result of the known is a non-sectional shield for developing steeply dipping layers consisting of lower and upper logs, stacked one on another across the strike of the formation and interconnected with the help of strips missed along the extension of the formation between p dami, and fastener elements 2 ..

The disadvantage of such a shield is the weakening of the knurling logs in places adjacent to metal strips (I-beams), as they are cut into the lower and upper rows of logs, as a result of which the beams do not always withstand the load, moreover, metal strips from I-beams Do not give the shield enough flexibility.

The purpose of the invention is to increase the strength and reliability of panel overlap.

This goal is achieved by the fact that the fastening elements are made in the form of cylindrical dowels installed in the lower and upper rows of logs across the strike of the formation, and the strips are made in the form of 15 flexible tapes and placed between the dowels.

FIG. 1 shows a flexible non-sectional shield, top view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. G.

Claims (2)

A flexible unsectional shield consists of several, for example, two, rows of edged logs (bars), stacked across each other of the formation’s strike and interconnected (in the transverse direction of the shield) by steel cylindrical nibs 1. In the direction of the formation (in the longitudinal direction shields) logs are interconnected by flexible bonds of metal or polymer tapes 2, missed between the upper 3 and lower 4 rows of logs and located between the pins in the direction perpendicular to the logs. The tapes on the periphery of the shield are rolled around the logs and pressed to them with the help of clamps (bolts) 5. The number of nibs and tapes is determined by calculation, based on the strength of the panel overlap. Along the perimeter, the shield has aprons 6, which are made of sheet iron, while the width of each apron is equal to the thickness of the log (bar) to which it is attached. The aprons, located on the side of the roof and soil of the reservoir, have angled edges in their upper part at an angle so as to ensure the flexibility (waviness) of the shield when the coal is dredged and moved. The shield is covered with a double layer of wire mesh 7 on top. Aprons and a double layer of wire mesh are used to protect the shield structure and the shield space from rock formation. Shield overlap moves along the dip of the reservoir under the force of its own weight and the weight of the collapsed and above the rock overlap. During the mechanized excavation of a mineral, the boarding is carried out smoothly, in a wavy manner, according to a shuttle pattern. The strength of the shield increases due to the fact that there is no need to cut the strips into the lower and upper rows of logs and thereby weaken their cross sections, as well as due to the fact that the splitting of the logs on the plane between the I-beams does not occur. tapes and steel cylindrical nagules, while it is possible to use a forest of smaller diameter and thereby reduce the consumption of timber. The implementation of a brass joint of edged logs in non-partitioned shields allows for a reduction in metal consumption per shield. The flexibility of the shield increases due to the fact that the strips in it are made of tapes, which provide the shield with a smooth, even fit during the mechanized excavation of the mineral, and thereby trouble-free operation and high production. Thus, the present invention makes it possible to increase the strength and flexibility of a shield, which greatly enhances its operational reliability and improves its controllability. Claims of the invention A flexible non-sectional shield for the development of steeply dipping layers consisting of lower and upper rows of logs stacked across the strike of the reservoir and interconnected with strips of strip extended along the strike of the reservoir between rows, and fastening elements differing from that, in order to increase the strength and reliability of the panel overlap, the fastening elements are made in the form of cylindrical dowels installed in the lower and upper rows of logs across the strike of the formation, and the strips are made in the form flexible tapes and are placed between the posts. Sources of information taken into account during the examination 1. USSR author's certificate No. 90745, cl. E 21 D 19/02, 1950. 2. USSR author's certificate number 112915, -kl. E 21 D 19/02, 1955 (prototype). Gi