SU1548430A1 - Method of erecting a reinforced rock-bearing support - Google Patents

Abstract

The invention relates to the mining industry, can be used for fastening capital workings using the bearing capacity of a reinforced solid, and allows you to increase the bearing capacity of lining and reduce the cost of work on its construction. A formwork consisting of a puff and a circle is installed, between which overlapping girders are laid. Holes are arranged at both ends of the girders. Through one hole, located in places of reinforcement of lining, drill holes are drilled and camouflet charges are blown into them. Through the other holes of the borehole, the plugging holes are injected, the binding solution is injected into them, the anchor is inserted before it is set, and the bores are tightened. The outer side of the puff and the circle adjacent to the array are coated with an insulating compound to prevent adhesion to the fastening solution. The part of the runs, which was used only to strengthen the formwork during blasting, is removed and previously also covered with an insulating compound, which serves to seal the formwork. The other part of the runs, which is used as longitudinal reinforcement, is cleaned to adhere to the fastening composition. 1 hp f-ly, 3 ill.

Description

one

(21) 4360022 / 22-03

(22) 11/05/88

(46) 07.03.SJO. Bul E number

(71) Kommunarsk Mining and Metallurgical Institute

(72) G. G. Litvinsky, V. B. Voloshin, I. G. Kalinchuk and V. V. Syrotyuk

(53) 622.284 (088.8)

(56) USSR Author's Certificate - № 1027400, cl. E 21 D 11/10, 1983.

Litvinsky G.G. Monolithic shell production of unloaded and hardened rocks. - Mine construction, 1981, No. 17, p. 17-20.

(54) METHOD FOR CONSTRUCTING REINFORCING BREEDING SUPPORT

(57) The invention relates to the mining industry, can be used for fastening capital workings using the bearing capacity of a strengthened massif and allows to increase the bearing capacity of the lining and reduce the cost of work on its construction. Install a formwork consisting of a puff and

circled, between which overlap stack runs. Holes are arranged at both ends of the girders. Through one hole, located in places of reinforcement of lining, drill holes are drilled and camouflage charges are blown into them. Through the other openings of the borehole, the plugging holes are injected, the fastening solution is injected into them, the anchor is inserted before it is set, and the fittings are tensioned. The outer side of the puff and the circle adjacent to the array are covered with an insulating compound to prevent adhesion with the fastening solution -. The part of the girders, which was used only to strengthen the formwork during blasting, is removed and also pre-coated with an insulating compound that serves to seal the formwork. The other part of the runs, which is used as longitudinal reinforcement, is cleaned to adhere to the fastening composition. 1 hp f-ly, 3 ill.

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The invention relates to the mining industry and can be used in fastening capital mine workings.

The purpose of the invention is to increase the carrying capacity of lining and reduce the cost of work on its construction.

Figure 1 shows the production with various stages of rock-bearing lining, a longitudinal section; in Fig. 2, sections A-A (production with installed formwork and drilled discharge holes) and BB (after explosive unloading of rocks) in Fig. 1; in FIG. 3, sections B-B (injection hardening of the rocks through plug holes) and YG (production is ready after installation of the anchors and removal of the formwork) in FIG.

The method is carried out as follows.

During the development, formwork is installed, which plays the role of temporary support and consists of

1, puffs 2. Interlaced girders are placed between the circles and 3 with the overlapping of the joints. The space between puff 2 and pedigree contour 5 is buried. Before laying the hook, its surface is covered with a thick insulating compound (for example, clay mortar, lime, etc.). The same solution was applied to the surface circling 1 in order to eliminate their adhesion to the fastening solution and to the runners 6, which were dismantled when the formwork was removed. Runs 3, which will be left as an element of permanent support, i.e. longitudinal reinforcement, cleaned of contamination and ensure their strong adhesion with the fastening solution. Runs and 6 with holes at both ends are installed where the unloading 7 and plugging holes 8 are to be drilled.

After the formwork has been erected through the holes in the runs 3 located at the reinforcement site, the formwork is circled, the loading holes 7 are drilled and camouflet charges 8B are blown into them, creating an artificial fracture zone 9 unloaded from stresses. The dynamic load from the explosion is perceived by the runs 3 and 6 and circling 1. Then, through the holes in the runs 3, drill the hole holes 8 and perform injection hardening of the rocks, creating a supporting bearing structure 10. Immediately after the bonding solution is injected, it begins to set into the plug holes. 8 insert the anchors 11 through the girders 3 and tension them out. After setting the mortar, I dismount the formwork to easily detach the support from the contour around 1, tighten the 2 and girders 6 that were not used to install the anchors, and and formwork. In re- As a result, a rock-bearing structure of lining 10 from unloaded and strengthened rocks, reinforced by depth with anchors 11 and along the breed contour - purlins 3, coupled to each other, coupled with fastening solution and lined with anchors 11, are obtained in development.

Such reinforced rock-bearing support structure possesses increased reliability and carrying capacity and is suitable for use under intense rock pressure in

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capital workings at great depths of development. The erection of such lining is quite technologically and not time consuming, and its cost is significantly reduced due to the consistent use of the principle of multifunctionality; the formwork performs the functions of a temporary support during excavation, then the supporting structure under local dynamic loads from the explosion and, finally, protecting functions when strengthening the rocks: the runs perform the functions of the formwork element, and then they are left in the permanent support, as a reinforcing structure, connected to the anchor; the grout-holes are then used to install anchors, coating the caps and circulating with an insulating solution (clay) s simultaneously solves two tasks: sealing the joints during hardening and facilitates dismantling the formwork. Drilling holes through holes in runs allows one to guarantee the completion of a drill passport and to place relief holes with explosive charges over the crosshairs and rounds, i.e. on the strongest formwork nodes, left intact the tightness during the explosion. This allows you to combine all the processes and operations of the technology of building lining a single plan, to achieve their maximum efficiency.

Claims (1)

Claim 1. A method of erection of reinforced rock-bearing lining, including installation of a formwork, drilling relief holes through the formwork and array discharge from stresses by blasting camouflet charges in them, drilling of plugging holes and injection molding of the array by injection of a frame, and a frame can be applied. Considering the fact that, in order to increase the bearing capacity of the lining and reduce the cost of the work on its construction, along the perimeter of the formwork on its outer side, overlap is additionally laid, some of which reinforce the formwork, while others reinforce the support in the longitudinal direction, with holes being pre-arranged at both ends of the girders, and discharge and cement holes are drilled through these holes from different ends of the prog 9U2 .1. 40 , tv s, -ЈЈ. I / I / i. A.s; 4 l A. 0g / 5 2 In-in gd W