Spacer tamping bar

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

 

The invention relates to the field of drilling and blasting operations in strong rocks and can be used in a variety of industries, applying gentle, including shelter, blasting in rocks of rocks on the surface.

There are various designs of locking seboek in the form of plastic tubes, wooden and concrete wedges /1/. Their main disadvantage is the complexity of the application and the impossibility of re-use.

The technical task to be solved by the invention, is to increase the efficiency of ore crushing rocks due to a long lock of detonation products in the charging cavity metal stemming until the complete destruction of the surrounding rocks.

This object is achieved by the use of spacer tamping, representing a split cylinder with at least three longitudinal slots and a tapered extension cavity down from the bottom, which is connected to the support ring via a spacer tube, the bottom of the slotted cylinder spacer inserted hollow tube consisting of conical and cylindrical parts with at least three longitudinal grooves provided with a tubular thrust threaded on the upper end, freely passing through holes in the bottom of the slotted cylinder and the bearing ring./p>

1 schematically depicts an expansion stemming in position in the borehole, figure 2 - after the onset of detonation.

Expansion stemming is made of metal and includes a split cylinder 1 with a bottom 2 in the upper part and a conical expansion of the cavity 3 from the bottom 2. In the walls of the slotted cylinder 1 parallel to the generatrix performed at least three longitudinal slots 4, and the bottom 2 are connected by spacer tube 5, at the upper end of which is fixed a support ring 6. In the split cylinder 1 is inserted hollow spacer tube 7, consisting of a conical 8 and 9 cylindrical parts with at least three longitudinal slots 10. On the bottom of the spacer 11 of the hollow tube 7 is fixed tubular rod 12, freely passing through the hole 13 in the base plate 2 and the hole 14 of the support ring 6. The upper part of the tubular thrust 12 threaded onto which is screwed a nut 15.

Expansion stemming works as follows. On the surface of the spacer block stemming gather in a constructive element. To do this, insert the spacer hollow tube 7 with a tubular thrust 12 into the cavity 3 of a cutting cylinder 1, skip tubular rod 12 through the opening 13 in the bottom 2, the spacer tube 5 and the hole 14 in the bearing ring 6. Then on the threaded portion of the tubular thrust 12 wind the nut 15 and tighten spacer hollow tube 7 to the entrance to split qi is indr 1.

Then through the tubular rod 12 is passed Explorer initiating impulse 16 (wires from the detonator, the waveguide nonelectric system or detonating cord) and spacer stemming lower bottom part of the borehole or well 17. The outer diameter of the cutting cylinder 1 and the cylindrical part 9 of the spacer of the hollow tube 7 4-6 mm less than the diameter of the bore-hole or well that allows the spacer stemming freely enter the hole or bore 17 to the location of the support ring 6 on the surface of the ledge. After that nut 15 retract the hollow spacer tube 7 in the split cylinder 1, it is through longitudinal slots 4 bursting split cylinder 1 in the wall of the borehole or well 17. Expansion stemming ready for use.

After detonation of the explosive charge in the charging cavity dramatically increases the pressure of detonation products to values of a few tens of thousands of atmospheres and dynamic kick gases over a large surface of the inner cavity of the conical portion 8 of the spacer of the hollow tube 7, which leads to the indentation of her split cylinder 1 tight wedging spacer tamping in the borehole or well. Tubular rod 12 thus passes freely through the openings 13 and 14 in the base plate 2 and the supporting ring 6, without violating the provisions of the latter. Split cylinder 1 in the first moment after the detonation of the charge remains fixed, because PR is the product of detonation affect only a narrow ring of the lower part of the conical expansion of the cavity 3, and the conical part 8 spacer of the hollow tube 7 due to the large end surface (tens of times greater than the area of the conical ring expansion cavity 3) takes considerable effort that leads to an immediate pressing her into the conical expansion of the cavity 3, and the final jamming of the cutting cylinder 1 in the borehole 17. This position was verified by experimental explosion with the expansion stemming similar in design (but without the cylindrical part 9) on the borehole with a diameter of 115 mm Diameter slotted cylinder 1 was 110 mm, its thickness in the lower part of the conical expansion of the cavity 3 was approximately 1 mm square, ring, accept the pressure of detonation products, amounted to 1.7 cm2, while the area of the conical part 8 spacer of the hollow tube 7 was about 95 cm2i.e. 56 times more. After the explosion traces slip through the borehole on the outer surface of the cylinder was found, which confirms thesis about the safe disposal of the cylinder device in the borehole wall prior to the destruction of rocks of the borehole walls. At the same time the pressure of detonation products and the cylindrical part 9 of the spacer of the hollow tube 7 against the borehole walls petals of this part, formed by longitudinal slots 10, and thereby increasing due to their coupling with walls of the vazhiny rasklinivanie all spacer tamping in the walls of the well 17. In case of failure of this pressure hollow spacer tube 7 will move up, increasing the thrust split cylinder 1 and coupling it with the walls of the borehole 17. As a result, the movement distance of the hollow tube 7 will stop, and an expansion stemming will be held in the bore 17 through the jamming of the cutting cylinder 1 and the thrust of the cylindrical part 9 of the spacer of the hollow tube 7.

In this position the spacer stemming remains until the breakthrough products of detonation of the charge cavity to the atmosphere through cracks in the broken array. Providing long-term isolation of the charging of the cavity, the spacer stemming contributes to a more complete course of secondary reactions in the detonation products and accordingly raises the energy of the explosion; this is especially important for modern coarse CENTURIES types of granulite and ramonito that have a significant share of the energy released in the process of secondary reactions.

After the explosion spacer stemming extracted from the rock mass, spin the nut 15, knock out the spacer hollow tube 7 of the cutting cylinder 1, for example, by blows of a hammer on a special nozzle, screwed on the tubular rod 12 instead of the nuts 15, or by using a hydraulic puller. The cylindrical part 9 of the spacer of the hollow tube 7 and the split cylinder 1 are calibrated to the diameter of the bore-hole or well and re-assemble the strut stemming for reuse.

Thus, the claimed expansion stemming allows long lock products of an explosion into the charging cavity, until the destruction of the array, and thus increase the energy efficiency of blast fragmentation of rocks.

Sources of information

1. Mindeli AO, Demchuk P.A., Alexandrov VE the Stemming of blast holes. - M Depths, 1967. - 152 C.

Expansion stemming representing a split cylinder with at least three longitudinal slots and a tapered extension cavity down from the bottom, which is connected to the support ring via a spacer tube, the bottom of the slotted cylinder spacer inserted hollow tube consisting of conical and cylindrical parts with at least three longitudinal grooves provided with a tubular thrust threaded on the upper end, freely passing through holes in the cylinder and the abutment ring.



 

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