SU943401A1 - Method of consolidating mine working with monolithic concrete - Google Patents

Description

(54) METHOD OF MOUNTING OF MINING PROCESS BY MONOLITHIC CONCRETE

one

The invention relates to the construction of underground structures and relates to the attachment of mine workings.

This method of fastening the excavation can be used in various parts of the national economy where it is necessary to construct extensive workings of a predominantly tunnel type, for example, transport tunnels that pass through fractured rock massifs, especially when using metal arch support that is usual for these conditions. for the great need of rolled metal, and the use of lightweight types of spray-concrete lining, anchors and their combinations is difficult due to safety conditions due to possible formations of fissured rock massif.

There is a known method of fastening mine workings, which includes installation in the bottom of prefabricated load-bearing tunnel structures (tubings, blocks) and filling the fixed space with a hardening mass, usually cement-sand mixtures 1.

The disadvantage of this method is the greater need for prefabricated structures, which limits its use in remote

areas where it is difficult to manufacture prefabricated structures and their delivery to the construction site.

The closest in technical essence to the proposed method is

5 fastening of mine workings with monolithic concrete, including installation in the face of sections of the adjustable formwork, from a special profile with expansion into the surface of the mine for using sections as a support and laying concrete mix 2.

The disadvantages of this method and the need for the operation of remounting sections before concreting, which reduces the rate of penetration, requires additional costs

15 labor. In addition, the lowering of the previously existing section into the production section may be caused by the separation of rocks and collapses, which eliminates the use of the method in highly cracked poles, or may cause a decrease in the bearing capacity of the array, which will require an increase in the calculated bearing capacity of the monolithic support.

Claims (2)

The purpose of the invention is to increase the rate of penetration and labor productivity, to prevent the stratification of rocks in the mine. This goal is achieved by the fact that the sections of the formwork establish a special profile with the ribs in the direction of the surface of the excavation and burst up before contact with it, and the concrete mixture is placed in the sinuses of the fixed space formed by the specified edges. In addition, the space between the support ribs of the sections is drawn in with metal mesh fencing structures which are left in the solid concrete body as reinforcement. FIG. 1 shows the stage of installation of sections with expansion in the surface of the excavation and the stage of laying the concrete mixture in the sinuses of the fixed space; in fig. 2 - stages after demoulding; in fig. 3 - Topiel with section unwrapped to the working surface, cross section. Fastening production of the proposed method are as follows. Near the bottom, they are installed with a thrust into the surface of the excavation 1 of the sectioned formwork 2, having protruding supporting ribs 3. At the calculated distance from the bottom, monolithic lining is concreted by placing the concrete mix 4 into the sinuses 5 of the fixed space. After the concrete has gained the necessary strength, the sectioned formwork sections are disassembled and used for fastening and concreting the next generation sites. To increase the number and area of contacting sections with the surface E of the processing, sections with hinges 6 are used, thanks to which sections 2 are inserted into the contour formed by the surface of generation 1 at the place of installation of sections B by bottom grids 7 that are left in the body of monolithic lining 8 quality fittings. If necessary, reinforcement cages can be installed in the sinuses 5 during the installation of sections in the face. The application of the proposed method makes it possible to ensure the fastening of the excavation following the sinking of sections that are being loosened into the rock, maintaining this gap during the laying and hardening of the concrete mix. As a result, the sectioned formwork sections, after being installed in the bottomhole, do not require reassembly before concreting, which not only reduces time and labor, increases the rate of penetration, but also preserves the load bearing capacity of the rocks surrounding the production “Support-mountain range, thereby increasing the reliability and durability of the support. Claim 1. A method of securing mine workings with monolithic concrete, including installing in the face of sections of adjustable formwork from a special profile with expansion into the surface of the mine for use as temporary lining and laying of concrete mix, in order to increase penetration rates and productivity , the formwork sections are set with protruding ribs of the special profile in the direction of the surface of the excavation and burnt up to the contact of the ribs with it, and the concrete mixture is placed in the sinuses of the fixed space formed by specified ribs. 2, a method according to claim 1, characterized in that, in order to prevent stratification of the rocks in the excavation, the space between the support ribs of the sections is tightened with metal mesh fencing structures, which are left in the solid concrete body as reinforcement. Sources of information accepted for use during examination 1.Volkov V.P. Tunnels and metro, M., 1964, p. 355. 2. USSR author's certificate A 669061, cl. E 21 D P / OO (prototype). Phage. 2