DE3118034A1 - "METHOD AND TRIM CAMP FOR INSULATING DRILL HOLES WITH PASTE SET" - Google Patents

Description

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The invention relates to a method for sealing boreholes according to the preamble of claim 1; The invention also relates to a filling ampoule for implementation this procedure.

The invention relates in particular to the filling of boreholes in underground operations, preferably in hard coal mining be used for explosive devices because under such explosive conditions on the reduction respirable dusts and, if necessary, the avoidance of firedamp and coal dust explosions Attention must be directed. Unlike the damming of explosive charges with the so-called Letten trimmings Water contamination has the advantage that such dangers are prevented by the filling itself. The water can however, even with minor damage to the water cartridge leak in the borehole. Since the empty shell has no damming effect, it can be significant in such cases Difficulties come. These can be avoided by adding paste, because the pasty properties of this Damming material away in their viscosity in the environment the filling cartridge 3 create adhesion and thereby prevent the charge from being exposed. Suitable pastes however, for their part, have a considerable proportion of water, which guarantees and contains the damming effect also gelling substances, which in turn must not trigger any dangerous effects, i.e. in particular hygienic are flawless. Carboxylmethyl cellulose, for example, are suitable for this, if necessary with the use of certain Stimulants or bentonite and alkalis.

It is known to prepare the paste ready for days

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To be introduced into the boreholes on site and outside the borehole with the aid of a pump. However, this procedure is disadvantageous for various reasons. On the one hand, it is questionable because it is difficult to check whether the Paste has reached the load and dammed it up in accordance with regulations. On the other hand, you need a relatively large amount of paste, which must be avoided for economic reasons. then The transport of the considerable amount of water in the paste has a particularly damaging effect.

The invention is therefore based on another known method, in which one each determined for a borehole Put the amount of paste in one or more stocking ampoules and insert these ampoules made of PVC or polyethylene introduces the borehole after cutting it at the tip or perforating it in some other way. In particular these are tubular ampoules made of flexible plastic film. One achieves with such ampoules the damming effect with certainty by the fact that the paste, i.e. at least the portion squeezed out of the filling ampoule the paste filling in the borehole, where it interlocks with the unevenness of the borehole and / or any Penetrates cracks.

Such pastes?: Cartridges have to be manufactured over a period of days mainly because one is for economic reasons can only produce amounts of stocking paste that are too large for a blasting operation. Takes place in appropriate systems the preparation of the paste and its filling into the ampoule shells. Since the paste may consist of up to 90% water and because of the large number of blast holes, e.g. in hard coal mining, considerable amounts of stock over long stretches

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have to be transported, there is a significant economic disadvantage due to this method associated water transport. In addition, water in sufficient quantity and quality immediately can usually be made available on site.

When water tamping it is therefore already become known (DBP 10 66 929), using preformed water tamping ampoules supplied welded smooth tip introduce the water filling under pressure on site, but outside the borehole into the vials, the ^first To seal ampoules pressure-tight and then to fill the drill holes with these ampoules. Because of the properties of the paste and the unfavorable conditions prevailing on site, a paste suitable for the paste cannot be placed in an empty cartridge or ampoule shell on site.

The 7th task of the invention is to design the filling of boreholes with paste filling rationally and in such a way that that the water transport:. is essentially omitted, but a proper dam of the cargo can be achieved.

According to the invention, this object is achieved by the characterizing features of the claims.

In the process according to the invention, the with the Pre-product filled cartridge or ampoule covers, which means that the paste can be properly filled for days can guarantee. You only need to fill up the missing water on site, which is not a problem because you have to can use the tried and tested technology. The production

the filling ampoule is thereby reduced to the mixing or dissolving of the preliminary product in the water content. This can be done automatically in the closed ampoule or by various auxiliary measures, e.g. by simple Shake the ampoule filled with the water content.

The transport effort with the features of claim 2 is lowest.

If necessary, it is advisable to secure the filling ampoule against loss of the concentrate or dry matter, which can be achieved by the features of claims 3 and 4. Here you can; Bohiilter containing dry matter be opened in the sealed ampoule. Alternatively, however, a container material is provided that is located in the filled up water dissolves more or less automatically.

The details and other features as well as other advantages the stocking ampoules proposed according to the invention result from the following description of embodiments with reference to the figures in the drawing; show it

Fig. 1 shows a first Ausfüirungsform of the invention in part broken representation and in longitudinal section,

FIG. 2, in a representation corresponding to FIG. 1, shows a modified embodiment of a paste filling ampoule according to FIG Invention,

FIG. 3 shows a section along the line III-III in FIG. 2 and

4 shows a further embodiment of the invention in elevation and plan view.

In all embodiments of the invention, there is one per se known water filling cartridge or ampoule 1 used, soft accordingly is preformed to the dimensions of the borehole. Acts according to the illustrated embodiments it is a blown plastic film with a rounded or conical tip 2. This ampoule body consists e.g. made of polyethylene or PVC. At its end opposite the tip 2, it has a shoulder 3 and a short one Neck 4 surrounding a filling opening 5 for water. the Filling opening 5 can be closed with a plug 6, which has a radial rib 7, which with a radial Groove 8 .im neck 4 cooperates so that a pressure-tight closure given is.

The invention can also be applied to film tubes, not shown, but in any case previously known, which are connected to are welded off at one end and have a self-closing lip valve at the other end through which water is filled can be, but that prevents the escape of water.

According to FIG. 1, the ampoule 1 contains two tablets 9 and 10, respectively. in which the essentially anhydrous dry matter of the paste filling is combined. Except for the two Tablets 9 or 10 empty ampoules are delivered on site, i.e. the ampoule is produced over days and with the Tablets filled. Fig. 1 shows that water has been filled in on site, which is in the ampoule up to the Spieqel 13 has risen. Besides the filled water

portion and the dry matter combined in tablets 9, 10, the paste is produced in the ampoule on site.

The preparation can be carried out by letting the tablets disintegrate and gel in the filled water.

Another embodiment of the invention is present according to FIG. 2, on the inner wall 11 one at the top at 12 and one at the bottom at 14 to attach closed film tube 15, e.g. to weld to the wall of the envelope 1. In the film tube 15 the dry matter is in the form of a powder 16 with instant properties.

The film tube consists of a tube that is easily soluble with water Material, for example a gelatin, so that after the introduction of the water filling the tube 15 the instant powder releases and gelation occurs.

An embodiment is similar, as it is in the two representations 4 is reproduced. Then the powder 16 is in a film tube 17, which is attached to his Ends at 18 and 19 is welded and therefore pillow-like Has training. Dur ^ h the welding is achieved an increased internal pressure, the release of the powder 16 and the Water filling facilitated.

Instead of tablets 9, 10 there is also the introduction of the dry substance or a concentrate in the form of flakes, Rods or similar shaped bodies into consideration, which are also relatively difficult when the stopper 6 is open Filling opening 5 can pass.

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The filling paste can be obtained from the concentrate in the ampoule or the dry substance and the water content can be produced with the properties required for the dam. The strength of the paste can be determined in advance by measuring the penetration and the proportion of the concentrate or · of the preliminary product.

The paste is preferably a homogeneous mixture, with only little energy being required to prepare the mixture is; this energy can be applied by shaking the filled ampoule for a short time. If you can reduce the time between adding the water to the ampoule and completing the stocking paste wants to use a concentrate in the form of a gel or paste, from which the Stocking paste can be produced by adding the water content. The dry substance is preferably used a mixture of a borate and rubber or resin.

A mixture of polyvinyl alcohol and sodium tetraborate is preferably used in order to produce a suitable filling paste. Here, the time and the completion of the trimming paste depends i in the Anpulle essentially on the proportions of ^{Mischungsstof:} e from.

To prevent the formation of lumps in the base paste, make the stocking paste in the cartridge as quickly as possible. This can be done by distributing the concentrate or reach the dry substance over the length of the ampoule. The embodiments shown are particularly suitable for this, in which the concentrate or the dry substance in dissolvable containers housed: is. If you use

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however, the concentrate or the dry substance in granulated form, then, for example, made of polyvinyl alcohol and sodium tetraborate particles with a water-soluble or water-distributable mass be wrapped, which consists for example of polyethylene glycol. This coating of the particles can be evenly in the water distribute before the concentrate or the dry substance is dissolved.

Depending on the ampoule design, the water can be brought in with the help of a filling nozzle, which in turn is connected to a water pipe. In such an ampoule consisting of a film tube with a lip valve, a mixture of 11.5 g of PVA, 4.75 g of sodium tetraborate and a coating of polyethylene glycol with a weight of 1.15 g was used as the concentrate in a practical test. This ampoule was made up to 170 ml. After filling, the vial was shaken by hand for 5 seconds. Then Oine homogeneous paste was formed, and the vial was after 30 Minu: on as far _f that it could be introduced into the wellbore to condemnation. The strength of the gel was determined with a penetration measuring device.

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Claims (10)

Claims (1. Borehole plugging method using an in the borehole introduced charge is dammed with a paste containing water in that at least a filling ampoule filled with the paste mixed with water is introduced into the borehole, thereby characterized in that the one containing a concentrate (9, 10; 16) and closable with a pressure-tight Filling opening (5) provided filling ampoule (1) on site, but outside of the BohrJoches filled with water and then from the water and from the concentrate the paste in the sealed Stocking ampoule is produced before this is introduced into the borehole with the finished paste. 2. The method according to claim 1, characterized marked that the concentrate as im essentially anhydrous «dry matter (9, 10; 16) in The stocking ampoule delivered on site is included and is dissolved with the water filling. 3. The method according to any one of claims 1 or 2, characterized marked that the in the stocking ampoule (1) contained dry substance (9, 10; 16) is in turn enclosed in a container from which it can be trespassed is brought into the water filling (13). 4. The method according to any one of claims 1 to 3, characterized in that the dry substance (16) containing container (15, 17) is dissolved with the water content of the paste. 5. stocking ampoule for performing the method according to any one of claims 1 to 4, characterized by filling with a concentrate or an essentially anhydrous dry substance (9, 10; 16) a filling paste and a closable filling opening or a self-closing filling valve for introduction a water filling (13), which makes up the liquid content of the paste. 6. filling ampoule according to claim 5, characterized in that the concentrate or the dry substance consist of one or more tablets (9, 10). 7. stocking ampoule according to claim 5, characterized in that the concentrate or the dry matter is granulated or flake and has instant properties. 8. stocking ampoule according to a 5m of claims 5 to 7, egekennzeichiet by a cover ■
(15, 17) the TrockensuDstanz (16) on the inner wall (11) the filling ampoule cover is attached. 9. stocking ampoule according to one of claims 5 to 8, characterized in that the concentrate or the dry substance from a mixture of borate and rubber or resin bf -estand.t. 10. stocking ampoule according to one of claims 5 to 8, characterized in that the concentrate or the dry substance from a mixture of polyvinyl alcohol and sodium tetraborate exist.