Suspended well stem

FIELD: mining.

SUBSTANCE: suspended well stem is arranged in the form of a solid cylinder, diametre of which is approximated and comparable to the well diametre to the maximum. The cylinder is installed at the depth of the massif with intensive cracking. Between a charge and a stem there is an air gap. The upper and lower ends of the cylinder are arranged as truncated in parallel to each other, besides the length L of the large axis of the formed ellipse equals 1.15-1.25 of the well diametre, besides, the upper end is fixed to the crosspiece arranged above the well head with a rope fixed near the lower edge of the truncated part of the stem.

EFFECT: invention makes it possible to use the energy of explosion products to the maximum, to intensify the process of rocks grinding, to reduce the specific weight of explosives, to increase quality of rock mass grinding, to increase reliability of the well stem, to simplify its manufacturing.

3 dwg

 

The invention relates to mining, to the field of drilling and blasting operations in rocks and can be used in a variety of industries, using blasting in rock masses, in particular when the open development of mineral resources.

Known borehole stemming from rock stuff, etc. that increase the duration of the expanding gaseous products of the explosion to destroy the array (Kutuzov BN. Blasting operations. M.: Nedra, 1988, p.223).

Also known borehole stemming having the form of a cylinder, the outer diameter commensurate with the diameter of the hole (patent RF №2229684, IPC 7 F42D 1/20, publ. 27.05.2004,).

A disadvantage of the known borehole stemming is the complexity of manufacturing and installation.

Known suspension borehole stemming (RF patent No. 2371671, IPC F42D 1/08, publ. 27.10.2009, bull. No. 30), made in the form of a solid cylinder, the diameter of which is closest to and less than the diameter of the hole, the cylinder is installed to a depth of array-intensive fracturing, between the charge and the stemming there is an air gap, the lower end of the cylinder is made thick and the top rope attached to the lintel above the mouth of the well.

A disadvantage of the known tamping is that at the moment of explosion stemming not always sticking well and is unreliable when used is lovanii it in hard rocks. When the walls of the well on top of it without stabbing, smooth, crashes stemming from wells not performing its function.

The technical result of the proposed technical solution is the intensification of the process of rock crushing, improving the reliability of tamping, the reduction of specific consumption of EXPLOSIVES, improving the quality crushing of the rock mass, simplify and cheapen the construction, improving the efficiency and lowering the cost of blasting borehole method by locking the detonation products in the charging cavity to the complete destruction of the array.

This technical result is achieved by the fact that the false borehole stemming, made in the form of a solid cylinder, the diameter of which is closest to and less than the diameter of the hole, the cylinder is installed to a depth of array-intensive fracturing, between the charge and the stemming there is an air gap, the lower end of the cylinder is made thick and the top rope attached to the lintel above the mouth of the well, according to the invention the upper and lower ends of the cylinder are made beveled parallel to each other, and the length L of the major axis formed by the ellipse is equal to 1.15-1.25 times the diameter of the hole, the upper end attached to the lintel above the mouth of the well by a rope fastened to the lower edge of the beveled portion of the tamping.

The inventive suspension borehole stemming illustrated by drawings, where figure 1 shows the structure of an outboard well tamping and its position at the time of lowering it into the well; figure 2 is suspended downhole stemming in the well in the working position; figure 3 - dimensions of the cylinder.

Hanging borehole stemming made in the form of cylinder 1 (Fig 1), the diameter DZabwhich is 0.75-0.85 diameter of the hole. The top side 2 and bottom 3 are cut parallel to each other, and the length L of the major axis formed by the ellipse is equal to 1.15-1.25 times the diameter of the hole (figure 3). If the length L is less than 1.15 m, suspended borehole stemming will fly out of the well during the explosion, and if L is more than 1.25 m, then suspended the borehole stemming will not reclinic in the well. Parallel beveled edges made to simplify the manufacture of the suspension borehole stemming (e.g., a log is cut into cylinders with the bevel made at the same angle). The cylinder 1 at a distance of 2-3 cm from the edge of the upper end is attached by ropes 4 and 5 to the crossbar 6, above the mouth of the well.

The inventive suspension borehole stemming works as follows. After drilling unit produce charging of wells, installation of the detonating circuit, then in the well to a depth of array-intensive fracturing (secondary is residualist, formed from the impact of the previous explosion - 1.5-2.5 meters) lower cylinder 1 (Fig 1), made for example of wood, beveled upper end 2 up, holding his rope 4 and 5, so that the wall of the cylinder 1 are parallel to the borehole walls. Lowering the cylinder 1 at the desired depth, the lower edge of the beveled end face 2 use rope 5 is fixed to the crossbar 6, above the mouth of the well, and then the cylinder 1 will jam in the hole in the working position (figure 2)and the rope 4 is freely released. Between the explosive charge 7 and suspended borehole stemming, made in the form of a cylinder 1, a blank space well. For sealing gaps, increase the area of friction between the cylinder and the wall of the well, increasing the resistance to the release of suspended borehole stemming from the well when the explosion of the charge, on the top beveled end 2 of the cylinder 1 fill drilling detail (rubble or small breed), which under the action of its weight bursting suspended the borehole stemming in the well, bringing it into working condition. At the moment of explosion of the gaseous products of the explosion to fill the free hanging borehole stemming space well and reach the cylinder 1, resting on the cylinder 1, which is firmly stuck in the hole, locking the gaseous products of the explosion, aided by the bevelled upper 2 andlower 3 the ends of the cylinder 1. Hanging borehole stemming promotes short-term locking of explosion products, thus increasing the duration of the expanding gaseous products of the explosion to destroy the array, hence the explosion energy to perform useful work - crushing rocks - spent. This results in intensification of rock crushing, reduction of specific consumption of EXPLOSIVES and improving the quality of crushing rock.

LLC "Kuzbasskommunproekt" processing area ISD (Processing box) LLC KRU-varitron" tests on the installation of suspended downhole zabek for tamping hole charges block excavator Terex No. 110.

Characteristics of exploding block: name rocks - Sandstone, fortress f - 9; category of deblocking - IV; well depth up to 18 m; the water content up to 8 meters; the volume of blasted rock mass - 390000 m

To identify health outboard borehole stemming in the experimental area was naburn block wells with grid 7*7 PM the Rest of the block was drilled with mesh 6*6 m In the experimental area 160 wells to a depth of 1.5 m on two polypropylene twines were installed suspended downhole tamping, made of wood in the form of a cylinder with a beveled top and bottom ends. The free ends of the splits by coupling the Ali to the wooden bar, and had it near the mouth of the well. For sealing gaps and increase the area of friction between the wooden cylinder and the wall of the drilled hole the remainder of the wells were filled up drilling a small thing. After mass explosion was a visual inspection and comparison of the size of pieces of blasted rock experimental and the control section unit. The quality of the prepared rock mass were assessed as good in the place where you have not installed suspended downhole tamping, and where they were installed. The tests suggest about the effectiveness of the proposed suspension downhole seboek.

The inventive suspension borehole stemming allows maximum use of the energy of explosion products, to intensify the process of rock crushing, to reduce the specific consumption of EXPLOSIVES, to improve the quality crushing of the rock mass, to increase the reliability of the downhole tamping, to simplify its manufacture.

This is achieved by providing time hanging borehole stemming necessary for the maximum energy of the gaseous products of the explosion; the simplification of the host suspended borehole stemming inside the well; ease of fabrication of suspended downhole tamping; a significant reduction in the cost due to economy of material.

p> Hanging borehole stemming, made in the form of a solid cylinder, the diameter of which is closest to and less than the diameter of the hole, the cylinder is installed to a depth of array-intensive fracturing, between the charge and the stemming there is an air gap, the lower end of the cylinder is made thick and the top rope attached to the lintel above the mouth of the well, wherein the upper and lower ends of the cylinder are made beveled parallel to each other, and the length L of the major axis formed by the ellipse is equal to 1.15-1.25 times the diameter of the hole, while the top end is attached to the lintel above the mouth of the well with a rope fastened to the lower edge of the beveled portion of the tamping.



 

Same patents:

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EFFECT: reduced labor content of deep-hole charging by distributed charges, reduced specific cost of the gate of the ultimate cost of the installed charge, reduced cost of deep-hole charging by distributed charges, simplified process of charge distribution in a deep-hole.

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EFFECT: reduced labor content and cost of deep-hole charging by distributed charges, reduced specific cost of the gate of the ultimate cost of the installed charge, simplified process of charge distribution in a deep hole and salvaging of the used rubber-containing materials.

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FIELD: drilling and blasting operations in hard rocks, applicable in various branches using blasting operations in hard rock masses.

SUBSTANCE: the suspended tamping bar of blast holes represents a split cylinder with at least three longitudinal slots and a tapered expansion of the cavity down from the bottom with a collet grip fastened through the center of its outer surface. A hollow spacer cone is inserted from the bottom into the split cylinder, the cone is connected to a rope haulage which passes through the collet grip, and with the upper end through a shackle with holes it is fastened an a lever installed on a bedplate. The rope haulage passes through the spacer tube fastened on the bedplate from the bottom.

EFFECT: provided locking of blast products in the charge cavity before destruction of the mass, enhanced efficiency of use of the blast energy for crushing of the rock.

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Spacer tamping bar // 2285899

FIELD: drilling and blasting operations in hard rocks, applicable in various branches using blasting, operations in hard rock masses.

SUBSTANCE: the spacer tamping bar represents a split cylinder with at least three longitudinal slots and a tapered expansion of the cavity down from the bottom, which is connected to the supporting ring through a spacer tube. A hollow spacer plug is inserted in the split cylinder from the bottom, it consists of tapered and cylindrical parts with at least three longitudinal slots, provided with a tubular haulage with a thread on the upper end, freely passing through the holes in the cylinder and supporting ring.

EFFECT: provided locking of blast products in the charge cavity before destruction of products in the charge cavity before destruction of the mass, enhanced efficiency of use of the blast energy for crushing of the rock.

2 dwg

Spacer tamping bar // 2285900

FIELD: drilling and blasting operation in hard rocks, applicable in various branches using blasting operations in hard rock masses.

SUBSTANCE: the spacer tamping bar represents a cylinder with a tapered expansion composed at least of three parts that can move in the horizontal direction on fingers fastened above and inserted in the guide bushes on the bottom. The split cylinder is connected in the upper part to a supporting ring through a spacer tube, and a hollow spacer cone is inserted in the inner cavity of the split cylinder, the cone is provided with a tubular haulage with a thread of the upper end, freely passing through the holes in the cylinder bottom and supporting ring.

EFFECT: provided locking of blast products in the charge cavity before destruction of the mass, enhanced efficiency of use of the blast energy for crushing of the rock.

2 dwg

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SUBSTANCE: the machine has a transportation base carrying a vessel for emulsion with a charging door closed with a cover, vessels for the gas-generating agent, water and petroleum product, ammonium nitrate bin. The transportation line, proportioning pumps for supply of emulsion, gas-generating agent, water and petroleum product, static mixer of emulsion and gas-generating agent, as well as the ammonium nitrate feeder are also positioned there. The vessel for emulsion is made minimum with one additional fire-fighting hatch that is positioned in the lower part of the vessel for emulsion and has a cover installed on the body of the mentioned vessel for automatic opening of the hatch due to self-destruction of the components of its cover and/or of its locking device at heating of the vessel body for emulsion in case of fire. The cover of the charging door is made in the form of a ring installed for pressing to the door ring edge, and membrane closing the central axial hole of the ring. The membrane is made for destruction under the effect of the maximum allowable pressure of vapors inside the, bin emulsion in case of emergency.

EFFECT: enhanced operating safety of the machine due to its equipment with devices for prevention of origination of a blast at a rise of pressure or temperature in its vessel for emulsion.

4 dwg

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