SU1315613A1 - Method of constructing artificial ceiling - Google Patents

Abstract

The invention relates to mining, m. used in the development of sloping deposits useful L 7; ± fossil and increases the bearing capacity of the artificial ceiling by ensuring its work with the overlying roof. Under the roof of the reservoir form a developed space. Reinforcing elements (AE) 3 are installed in it. Each AE 3 is placed in an insulated shell 5 and tensioned. The upper ends of the AE 3 are fastened to the roof, and the lower ends are fixed in the soil of the excavated space. On AE 3, support elements 4 are installed and then an artificial array 6 is formed by laying the worked out space with hardening mixtures. After a set of the bookmark regulatory strength work below mineral reserves. During working off by the release of the lower ends of the AE 3, the formed artificial mass is pressed to the roof. 2 Il. (L oo O1 OS oo g /

Description

eleven

The invention relates to mining and can be used in the development of inclined mineral deposits, where artificial ceilings are used for safe mining conditions. The aim of the invention is to increase the bearing capacity of the artificial ceiling by ensuring that it works together with the lowering roof.

FIG. 1 shows the strike of a part of the ore body with mining under an artificial roof, a section; in fig. 2 is a section A-L in FIG. one.

The method is carried out as follows.

Mining operations begin with the formation of a space under the roof of a deposit. Anchors 1 and 2 are installed in the roof and in the soil of the developed space, between which reinforcing elements 3 with supporting elements 4, for example washers, are tensioned. In order to prevent seizure of the backing material with reinforcing elements 3, they are placed in insulating shells 5, for example in PVC tubes. The characteristics of the reinforcing elements, the frequency of their installation, the dimensions of the supporting elements are chosen based on the thickness of the artificial ceiling, the density and mechanical properties of the hardening tab.

The amount of stretching L 1 reinforcing elements you () irayut of the condition

h.Al,

where h is the amount of shrinkage hardening bookmarks;

1 - the length of the reinforcing element; .g - conditional yield strength;

E - modulus of elasticity reinforcing

an item.

Then, the artificial mass 6 is formed by setting the developed space with hardening mixtures. After filling the developed space, the hardening laying and shrinkage of the cavity 7 between the hardened mass and the roof occurs. The shrinkage of the hardening bookmark was due to a decrease in the volume of cement stone in the process of hardening with loss of moisture. The process of hydration of the main components in the suspect occurs with the infusion of the heat, with the highest temperatures occurring in

five

6i; 52

backfill array array. (Consequently, during the shrinkage of the hardening bookmark formed) the massif will repeat the shape of the roof of the developed space.

After the set is made with the laying of the normative strength, the mineral reserves located below are processed. During the working out of the lower ends of the reinforcing elements, the artificial mass is pressed against the overlying roof due to the forces of their elastic recovery. Thus, the roof and pressed to it, the stream begins to work as a composite beam, the strength of which is much greater than not only the individual, but also the total strength of its constituent elements, which allows 0 (jT to increase the spans of the cleaning chambers under the artificial ceiling, and reduce flow rate in a hardening tab.

Example. The ore deposit is worked in layers in a descending order with the laying of the goaf. Take out the layer under the roof capacity of 2m. Anchors are installed on the grid of 1x1 m into the soil and roof of the developed space of the formed layer, between which the cable J1K-3 with a diameter of 16 mm is pulled with the help of a hydrohram. A 10 cm diameter and 1 cm thick faceplate is put on the rope. The stretch of the strain is 5 tons. At the same time, the stretch of the canal is in the zone of elastic deformations and in absolute value is equal to the shrinkage of the hardening tab, which is 0.5. - 3.0 mm / m. Then they lay the developed space with hardening material. To prevent the rope from hardening with hardening material, it is placed in PVC tubes. After dialing a tab of the normative strength, the reserves under the artificial massif formed. When part-time artificial ceiling free ends

0 under the action of the elastic forces of the rope is pressed against the roof.

The pressing ensures the creation of an artificial ceiling with an increased bearing capacity.

Formula and 3 o b re shadow

The method of construction of artificial ceiling, including education

313

depleted space under the roof of the reservoir, installation of reinforcing elements in the high fatigable space, fixing their upper ends to the roof, installing reinforcing elements on the supporting elements, forming an artificial array of laying out the depleted space with hardening mixtures and working out the minerals underlying the iacoB with freeing the lower ends of the reinforcing elements , characterized in that, with the aim of higher 56134

Not only one has the ability of an artificial ceiling by ensuring that it works together with the overlying roof, the supporting elements are set before laying the worked space, each reinforcing element is placed in an insulating sheath and tensioned with fixing the lower end in the soil of the prepared space, and by releasing the lower ends of the reinforcing elements, the formed artificial mass is pressed against the roof.

FIG. 2

Compiled by A.Loginsky Editor G.Gerber Tehred M.Hodanich Proofreader I.Musk

Order 2329/33 Circulation 454 Subscription

VNIIGSh of the USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

Claim The method of erecting an artificial ceiling, including the formation of a mined-out space under the roof of a deposit, installation of reinforcing elements in a mined space with fixing their upper ends to the roof, installation of supporting elements on reinforcing elements, the formation of an artificial array by laying of the mined-out space with hardening mixtures, and the development of the underlying mineral reserves with the liberation lower ends of the reinforcing elements, characterized in that, in order to increase the bearing capacity the artificial ceiling due to its joint operation with the overlying roof, the supporting elements are installed before laying the worked out space, each reinforcing element is placed in an insulating shell and stretched to fix the lower end in the soil of the developed space, and the lower ends of the reinforcing elements are pressed formed artificial massif to the roof, Aa