SU588374A1

SU588374A1 - Device for measuring displacement of roof

Info

Publication number: SU588374A1
Application number: SU721836572A
Authority: SU
Inventors: Сергей Алексеевич Летов; Анатолий Алексеевич Двинин
Original assignee: Всесоюзный научно-исследовательский институт горной геомеханики и маркшейдерского дела
Priority date: 1972-10-09
Filing date: 1972-10-09
Publication date: 1978-01-15

Description

щение рисок, фиксирующих положение оптической системы и планшета.Scratch marks, fixing the position of the optical system and tablet.

Луч света, отража сь от зеркала 6, проходит через линзу И, круглую диафрагму 12, линзу 13 и попадает на планшет 3, где отмечаетс его первоначальное положение. Перед следующим измерением устройство устанавливают в исходное положение и отмечают на планшете новое положение луча. Соедин точки исходного и нового положений луча, получают величину и направление вектора смещени луча. Затем проектируют вектор смещени луча на направление пласта и определ ют величину сдвига кровли относительно почвы по падению пласта. Проектиру вектор смещени луча на ось, перпендикул рную к линии падени пласта, можно получить величину смещени луча в сторону забо лавы. Отношение величины этого вектора к рассто нию от планшета до кровли пласта характеризует изменение тангенса угла наклона кровли за период извлечени очередной полосы угл или величину изменени угла наклона кровли за период отработки очередной полосы угл .The beam of light reflected from the mirror 6 passes through the lens I, the circular diaphragm 12, the lens 13 and enters the plate 3, where its initial position is noted. Before the next measurement, the device is set to its original position and a new position of the beam is marked on the tablet. Connecting the points of the initial and new beam positions, get the magnitude and direction of the beam displacement vector. Then project the vector of the beam displacement to the direction of the reservoir and determine the amount of shift of the roof relative to the soil along the dip of the reservoir. By projecting the vector of the beam displacement onto the axis perpendicular to the dip line, one can obtain the magnitude of the beam displacement towards the side of the side. The ratio of the magnitude of this vector to the distance from the plate to the roof of the reservoir characterizes the change in the tangent of the angle of the roof during the period of extraction of the next coal strip or the amount of change of the angle of the roof during the development of the next coal strip.

Claims

1. A device for measuring roof displacements containing two reference points fixed in

the soil and the roof of the formation, and a plate mounted on a bench mark in the soil, characterized in that, in order to measure the magnitude and direction of the roof shear in the plane of the formation

relative to the soil on steep dip beds, it is equipped with a projecting optical system with a light source placed in the housing, which is fixed on the bench in the roof, and two protractors installed in

case.

2. The device according to claim 1, characterized in that the protractor for determining the angle of inclination of the roof is hinged to the housing, and the protractor for determining the deflection of the beam from the vertical is rigidly fixed to the housing.

Sources of information taken into account in the examination

1. Eidinov V. Ya. Measurement of angles in mechanical engineering. M., “Mashinostroenie, 1963, p. 253-256.

2. Inashvili A.K., Giorgobiani G.N. A device for measuring horizontal displacements of a direct roof. M., Sat. IGD them. A. A. Skochinsky. Methods and instruments for studying rock pressure, 1964, p. 80-83.

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