WO1991002212A1

WO1991002212A1 - System for bracing an explosive charge in a borehole

Info

Publication number: WO1991002212A1
Application number: PCT/EP1989/000886
Authority: WO
Inventors: Wilhelm Leppak
Original assignee: Wilhelm Leppak
Priority date: 1988-04-30
Filing date: 1989-07-27
Publication date: 1991-02-21
Also published as: EP0436548A1; DE3814746A1; DE3814746C2

Abstract

A system for bracing an explosive charge in a borehole (7) comprises a sheath (3) which houses a charge column (2) formed by an explosive cartridge (1). A flexible tube (5) closed at one end fills the space between the sheathed charge column (2) and the wall of the borehole, and is filled with water by a filling device. The flexible tube (5) is made of at least extensible material and has an extension (8) which projects beyond the charge column (2) in the direction of the borehole mouth. The charge column can be inserted together with the flexible tube and the tube can be filled, i.e., the charge column can be braced, in a comparatively short time. To this end, the extension (8) of the flexible tube (5) is dimensioned so that its free end (9) is located outside the borehole (7) when the flexible tube (5) is fully inserted in the botehole. The extension (8) of the flexible tube (5) has a smaller, preferably much smaller, cross-section than the flexible tube. The free end (9) of the extension (8) of the flexible tube (5) can be closed.

Description

"System for bracing an explosive charge in a borehole"

The invention relates to a system for bracing an explosive charge in a borehole, which has a casing which accommodates the explosive cartridges forming a charging column, a hose body which fills the space between the coated charging column and the borehole wall, which holds a water filling and is closed at one end, and a filling device device for the tube body, the tube body being made of at least stretchable material and equipped in the direction of the mouth of the borehole with an extension extending beyond the charging column.

From DE-PS 27 20 105 a method for blasting is known, in which the explosive cartridges forming a charging station are arranged in a tubular, closed casing and are inserted into a borehole therewith. The shell containing the explosive cartridges is arranged within a part of a hose filled with water, so that the charging station itself

REPLACEMENT LEAF 2 - has no contact with the water. The space between the covered charging column and the borehole wall is filled by means of the outer hose filled with water, at least over the entire length of the charging column. In this known method, a hose made of elastic material is used. The outer hose is extended in the direction of the mouth of the borehole beyond the charging station, so that it can simultaneously act as water. Thus, the explosive is not only separated from the water, son¬ countries it is also proper condemnation of the explosive charge within ^'instead of the borehole by those on all sides surrounding water. This known method has proven itself per se, but the introduction of the encased charging station and the hose body filled with water has proven to be comparatively complex since these are parts which are separate from one another. First of all, it is necessary to insert the explosive cartridges into the casing and to seal them in a water-tight manner. Thereupon the casing with the charging column is either pushed into the hose body and this is filled with water, or the hose body filled with water is pushed over the casing and inserted together with it into the borehole.

SPARE BLADE In order to further improve the above-mentioned known method, DE-PS 32 07 121 proposes a charging system for introducing an explosive charge into a borehole, which has a casing which accommodates the explosive cartridges forming the charging station and a casing which holds a water filling has a hose body closed at one end. The sheath receiving the charging station is attached to the hose body receiving the water filling, the sheath extending essentially over the length of the hose body, which is equipped with a valve closure. The envelope is closed at its front end and open at its rear end. The sheath and the tube body are made of at least stretchable material. The loading system further comprises a combined loading and filling stick, in which there is a filling pipe, the front end of which projects outwards on the loading stick and is assigned to the valve closure of the hose body, while the front end of the loading stick can be placed on the loading column . With the aid of this loading system, it is possible to push the sheathed charging column together with the hose body into the borehole down to the borehole by means of the combined loading and filling stick, whereupon the filling of the hose body is carried out by actuating the loading and filling stick.

REPLACEMENT LEAF 4 - pers and thus the desired tensioning of the charging column within the borehole. This known charging system has also proven itself well, but placing the charging column and the hose body and bracing it in the borehole not only requires a certain amount of manual dexterity, but also a considerable amount of time.

Starting from this prior art, the invention is based on the task of creating a system for bracing an explosive charge in a borehole of the type mentioned at the outset, which avoids introducing the above-mentioned disadvantages and which involves introducing the charging column with a tubular body and filling the Hose body and thus the tensioning of the charging station in a comparatively short time.

This is achieved according to the invention in that the lengthening of the hose body is dimensioned such that its free end is outside the borehole when the hose body is located deepest in the borehole. This configuration of the system makes it possible to use a conventional ramrod to load the encased charging station together with the hose body into the deepest part of a drilling

^• 4 holes to slide and then one as a filling device

REPLACEMENT LEAF Spray gun or the like used. to be attached to the free end of the extension in order to fill the hose body from outside the borehole and thereby tighten the encased charging column, which is sealed watertight against the hose body. In this way, the time required for introducing an encased charging station with hose body and for filling the hose body is reduced to a very considerable extent.

The extension of the hose body advantageously has a reduced cross section compared to the hose body, which serves to save material.

The free end of the extension of the hose body is closable. The free end of the extension of the tube body can be closed by means of a valve, a lip valve, a knot or the like. respectively.

According to a further feature of the invention, the extension of the hose body has at least one section with an enlarged cross section. When the hose body is filled, the section with an enlarged cross section also occupies a larger space than the extension, so that

REPLACEMENT LEAF the borehole is filled and thus a fixed tension in the borehole is achieved. If several such enlarged sections are used, the entire hose body is secured in a chamber-like manner and thus a secure closure of the borehole.

A section with an enlarged cross section is advantageously located in the region of the mouth of the borehole.

Conventional spray guns which are connected to the pressurized water supply can be used as the filling device. In this way it is possible to fill several tubular bodies arranged in adjacent boreholes at the same time, or it is also possible to carry out a method in which one person pushes the encased charging stations with tubular bodies into a borehole using a ramrod ¬ the and then a second of the filling process is carried out by means of a spray gun.

According to a further proposal of the invention, the filling device can be connected to the water supply via a reducing valve, so that there is considerable water saving compared to the known method of operation.

ER _SA TZBLATT The connection fittings used for filling the hose body with water are designed as plug-in fittings, so that these system parts can be coupled and uncoupled easily and quickly.

As is known per se, the sleeve accommodating the charging station is attached to the tube body, the same width foil sections being connected to one another at their longitudinal edges, for example by welding, gluing or the like. According to a further proposal of the invention, the film section forming the envelope, which serves to receive the charging station, has a greater width than the film sections forming the tubular body, but this runs flush with those of the tubular body along the longitudinal edge. This results in a pocket-like shell, which considerably simplifies the insertion of the explosive cartridges, regardless of whether they are inserted individually into the pocket-like shell or already combined to form a charging station.

According to a further proposal of the invention, a means for controlling dust and / or nitrous gases is added to the water filling of the hose body, so that the dust which has already been achieved by the proper dam is reduced.

REPLACEMENT LEAF how the nitrous gases are further improved by the added agent.

The invention is explained in more detail using an exemplary embodiment, and shows:

1 shows a sectional side view of a borehole with the charging station located deepest in the borehole and the tubular body located, FIG. 2 shows a plan view of the tubular body and FIG. 3 shows a sectional side view of the same according to line II-II of FIG. 2.

1 denotes the individual explosive cartridges which form the charging station 2, the explosive cartridges 1 being located in a casing 3.

The sleeve 3 is formed by a film section 4, which is attached to the tube body 5, which consists of the two film sections 6. The film sections 4, 6 lie on one another with their longitudinal edges and are flush with one another, the longitudinal edges being welded, glued or the like. are connected to each other.

REPLACEMENT LEAF The sheath 3 extends essentially over the length of the hose body 5, this forming an attached pocket into which the explosive cartridges 1 can be inserted individually or already combined as a charging station. In order to facilitate the insertion of the explosive cartridges 1, the film section 4 forming the sleeve 3 has a greater width than the film sections 6 forming the tube body 5, the longitudinal edges, however, being flush with one another, with the result that, due to the greater width of the film section 4, a pocket-like Extended recording is available, which significantly simplifies and facilitates the insertion of the explosive cartridge 1.

At least the hose body 5 is made of stretchable or elastic material in order to achieve the desired expansion for damaging the charging station 2 when it is filled.

As can be seen from FIG. 1, the encased loading column 2 with the hose body 5 is located in the deepest of the borehole 7. The insertion is carried out with the aid of a conventional loading stick.

According to the invention, the hose body 5 is provided with a

REPLACEMENT LEAF Extension 8 equipped, the length of which is dimensioned such that its free end 9 is located outside the borehole 7 when the tubular body 5 is located deepest in the borehole. At the free end 9, the extension 8 of the tube body 5 is closed, for example with a lip valve 10.

The extension 8 has a substantially smaller cross-section than the hose body 5, so that material savings are achieved. However, it is also possible to lead the tube body 5 out of the mouth of the borehole with an unchanged cross section.

As can be seen from FIG. 2, the extension 8 of the hose body 5 can be provided with a section 11 which has a considerably larger cross-section than the extension 8, for example that of the actual hose body 5 Section 11 a corresponding expansion, so that additional bracing in the borehole 7 is achieved. This effect can be further increased by several such sections 11, in particular one in the area of the mouth of the borehole, so that a chamber-like bracing and partitioning of the borehole is effected.

1 * REPLACEMENT LEAF The handling of the system according to the invention is as follows:

The explosive cartridges 1 are inserted individually or already combined into a column in the pocket-like, expanded and formed casing 3. Then the encased charging station 2 with the tubular body 5 is pushed into the deepest hole of the borehole by means of a conventional ramrod. After reaching the intended location, a spray gun or the like. attached to the free end 9 of the extension 8 hanging out of the borehole 7, whereupon the hose body 5 and possibly the section (s) 11 are filled by actuating the spray gun. At the free end 9 there is, for example, a lip valve 10 which closes automatically after filling the hose body 5, including any sections 11 present, so that the spray gun is removed and placed on the free end 9 of the extension 8 of the hose body 9 in a next borehole 7 can.

The explosive cartridges 1 are separated from the filling of the hose body 5 in the casing 3, so that it is ensured that they cannot come into contact with water.

REPLACEMENT LEAF

Claims

PATENT CLAIMS:

1. System for tensioning an explosive charge in a borehole (7), which has a casing (3) receiving the explosive cartridges (1) forming a charging station (2), a space between the encased charging station (2) and the borehole wall Filling hose body (5) receiving a water filling and a filling device for the hose body (5), the hose body (5) being made of at least stretchable material and extending towards the mouth of the borehole with a one extending beyond the charging column (2) Extension (8) is equipped, characterized in that the extension (8) of the hose body (5) is dimensioned such that its free end (9) when the hose body is located deepest in the borehole «. (5) outside the borehole (7)

REPLACEMENT LEAF located.

2. System according to claim 1, characterized in that the extension (8) of the hose body (5) has a compared to the hose body (5) reduced, preferably significantly reduced, cross section.

3. System according to claim 1 or 2, characterized in that the free end (9) of the extension (8) of the hose body (5) can be closed.

4. System according to any one of the preceding claims, characterized in that the closing of the free end (9) of the extension (8) of the hose body (5) by means of a valve, a lip valve ^' (10), a knot or the like. he follows.

5. System according to any one of the preceding claims, characterized in that the extension (8) of the hose body (5) has at least one section (11) with an enlarged cross section.

6. System according to any one of the preceding claims, characterized in that a section (11) with an enlarged cross section is in the region of the borehole

REPLACEMENT LEAF mouth is located.

7. System according to any one of the preceding claims, characterized in that a spray gun is used as the filling device.

8. System according to any one of the preceding claims, characterized in that the filling device can be connected to the water supply via a reducing valve.

9. System according to any one of the preceding claims, characterized in that the connection fittings used for filling the hose body (5) with water are designed as plug-in fittings.

10. System according to one of the preceding claims, in which the charging column (2) receiving sleeve (3) is attached to the hose body (5), characterized in that the section (4) forming the sleeve (3) is larger Has width than the film sections (6) forming the hose body (5), but runs along the longitudinal edge flush with those of the hose body (5).

REPLACEMENT LEAF - 15 - 11. System according to any one of the preceding claims, characterized in that the water filling of the hose body (5) is added a means to combat dust and / or nitrous gases.

^ERS ATZBLATT