FR2558892A1 - LOW TUBULAR CLOSURE FOR DRILL HOLES - Google Patents

Abstract

THE INVENTION RELATES TO A LOST TUBULAR CLOSURE FOR DRILL HOLES. THE CLOSURE FOLLOWING THE INVENTION CONSTITUTES ESSENTIALLY OF A FILLING TUBE 1 THAT CAN BE ASSEMBLED FROM TRUNKS AND INCLUDING, AT ITS TIP, A SAFETY AGAINST DISCHARGE IN THE FORM OF A CHECK VALVE5, A MIXING ELEMENT AND A SEALING ELEMENT 2 MADE IN THE FORM OF A TRUNK OF A HOSE IN ELASTIC MATERIAL AND MOUNTED AT ITS ENDS IN METAL BUSHES11, 12. THE CLOSURE ACCORDING TO THE INVENTION IS USED TO INJECT, INTO THE BORE HOLES, IN PARTICULAR D 'UNDERGROUND MINING FACILITIES, SUITABLE ENVIRONMENTS, IN PARTICULAR, FOR THE CONSOLIDATION OF ROCK, FOR EXAMPLE, A SYNTHETIC RESIN.

Description

Tubular closure lost for drill holes.

  The invention relates to a tubular closure

  lost for drilling holes in order to inject

  suitable places, in particular, for the consolidation of the rock, for example, a synthetic resin, this closure consisting essentially of a filling tube that can be assembled from sections and having, at the tip, a safety against the backflow in the form of a valve of

  restraint, a mixing element and an element of

  made in the form of a section of hose made of elastic material and mounted at the ends in

metal sockets.

  For the consolidation of friable and crumbled rock layers, particularly in underground coal mines, the injection of a synthetic resin has become important.

  bigger and bigger. When injecting

  closures which can be introduced into boreholes and which are called "jams",

are particularly important.

  According to the patent of the Federal Republic of Germany 29 03 137, there is already known a lost tubular closure for drilling holes of the type mentioned in the introduction above, this closure being able to be disposed at any desired location in the hole

  while it has functional safety

  against backflow and flow, while also allowing mixing

  inside the tubular piece.

  The major disadvantage of such a lost drill hole closure is that, due to the retaining and sealing elements employed, it can only be used in defined drill holes, i.e. drill holes with a constant cross-section, so that the closing or sealing of the drill holes

  drilling can only be carried out in an unsatisfactory

  satisfactory in areas with larger

cross-sectional

  Another disadvantage of the weight of closures

  hitherto used for boreholes, as regards the safety required when they are introduced, is that after it has been introduced into the borehole or

  a gallery which does not yet have the support

  the desired packing and packing, that is to say in a

  high-risk area with regard to safety,

  borehole should be tightened, for example,

  1i by means of screwdrivers.

  On the other hand, the object of the invention was to provide a borehole closure for the purpose of injecting, in particular, suitable media for the consolidation of the rock, which closure can be sealed tightly and in a suitable manner.

  sufficient measure, even in cross-sections

  the undefined borehole, while constituting

  at the same time, it is an improvement from the point of view of safety, so that manual mechanical tightening

  or using a hitting screwdriver is no longer necessary

  necessary. According to the invention, this object is realized because, within the area surrounded by

  the sealing element, the filling tube com-

  door, in addition, a soupapet while the element

  sealing is carried out in such a way as to ensure the

  and can be tightened automatically when

  of the injection as a function of the different pressure

created by the valves.

  The valve providing safety against delivery and provided at the point of closure of the borehole, that is to say in the direction of the deepest point of the latter, can be adjusted by means of the spring used in such a way during the pressing of the synthetic resin through the filler tube, this resin is distributed first of all to the intervention of the valve disposed in the zone of the sealing element, in the intermediate space between the filling tube and this sealing element, so that the latter comes to apply in the manner of a body automatically inflating on the wall of the borehole in

  exerting a sealing effect and tightening.

  According to an advantageous characteristic

  within the scope of the invention, the valve

  in the form of a check valve is

  at least one opening opening into the filler tube and surrounded by a tubular sleeve

  flexible. In this way, one can fill a

  perfect sealing and inflating of the sealing element without, during a corresponding application of the sealing element on the wall of the borehole, a backflow which can disturb the subsequent process

injection.

  In addition, according to a particular characteristic

  Advantageously, the metal sleeves trapping the sealing element at the ends are made in the form of tubular sleeves that can be screwed onto the filler tube and spaced a constant distance; the height of the metal sleeves each freely receiving the sealing element is calculated to store

this sealing element. -

  Storage allows for significant swelling

  both of the sealing element and hence its adaptation to undefined cross-sections

  of the borehole. In order not to destroy the

  sealing elements made from a flexible material such as, for example, the rubber, during inflation and during sliding associated therewith the sockets, according to the invention, the metal sleeves are made with a longitudinal slot at least over a partial length and thus, thanks to flexibility, they are adapted to the pressure of

  inflation. Other advantages of the invention are

from the description below.

  Together with the metal sockets, t5 the sealing element can be introduced to any

  which part of the filling tube.

  At least over a partial length of the height, the metal sleeves are made with

a longitudinal slit.

  Below the safety against repression

  which is placed at the tip of the tube

  wise and that is realized in the form of a valve

  retainer, an annular retainer is provided.

  The retaining element made from an electrically conductive raw material is at the same time provided for the required earthing

filling tube.

  In the metal bushing directed towards the mouth of the borehole, is disposed an element

sealing.

  At least the metal sleeve directed towards the mouth of the borehole is formed in the form

  an assembly element for the pipe sections.

  The end of the filler tube, which is located outside the borehole, has

255,892

  an external thread intended to receive a nipple of

connection that can be screwed.

  In the end of the filling tube, it is arranged, so as to be able to introduce it, a mixing element comprising a retaining ring

analogous to a flange.

  To accommodate the retaining ring, without destroying it, inside the connecting nipple screwed onto the end of the filling tube, a counter-nut is provided fixing the distance between the

no screws.

  The sealing element made from an elastic material, for example rubber, is reinforced by a support grid made by

example, fabric or metal.

  As already mentioned, the technical progress of the invention is based on the fact that a mechanical tightening of the closure of the borehole, mainly in galleries that are not

  sufficiently assured, is no longer necessary,

  thus considerably reducing staff safety, while at the same time ensuring, in a simple and cost-effective manner, adaptability to cross-sections

undefined borehole.

  An example will be described in more detail below.

  embodiment of the invention with reference to the accompanying drawings, in which: FIG. 1 is a partial illustration of the drillhole closure according to the invention, in a schematic form and in sectional view, and

  Figure 2 illustrates the example of

  (shown in FIG. 1) of a filling tube comprising an extension and an injection connection

  provided outside the borehole.

  As can be seen in FIGS. 1 and 2, the borehole closure consists essentially of a filling tube 1 which, as pointed out in particular in FIG. 2, is designed so that it can be extended by 'imported

  which way to the intervention of assembly sleeves

  In order to receive the metal bushings 11 and 12 in the form of sleeves, the filling tube 1 comprises, in corresponding zones, threads 13 and 14. The metal bushings 11 and 12 are screwed and directed toward each other on the filling tube 1 so as to receive, in the manner of a sleeve, a sealing element 2 made in the form of a hose of elastic material,

  for example, rubber. For the purpose of

  the sealing element 2 may comprise a

  support grid 24, for example, metal or fabric.

  The sealing element 2 must be disposed at any point in the borehole 3 on the

  filling tube 1 or on sections of this

  independently of the safety relief valve 5 which is adapted to the point of the closure of the borehole and which is constituted

a spring 6 and a ball 7.

  In the filling tube 1 and, in fact,

  in the area that is surrounded by the water element

  2, a check valve 8 is installed which consists of at least one opening 9 opening into the filler tube, as well as a cuff

  flexible material surrounding the filling tube

  1 and the opening 9. Depending on the length of the

  2, the metal bushings 11 and

  12 are spaced from each other by a fixed distance.

  The height 15 of the metal bushes 11, 12 receiving the sealing element 2 in the manner of a sleeve

  serves to store this sealing element 2.

  During inflation, the sealing element 2 comes out of the metal bushings 11, 12 until the undefined cross section of the borehole, that is the wall 4 of the borehole 3, forms stubborn. In order to avoid, as a result of the inflation, destruction of the sealing element 2 on the edges of the metal sleeves 11, 12, the latter comprise, at least partially on the height 15, a longitudinal slot. In this way, a certain flexibility of the wall of the casings is obtained.

  Below the valve 5 forming the safety

  Against the discharge, there is provided a retaining element 16 surrounding the filling tube 1, this element having, on the one hand, the purpose of locking the closure in its provisional position after its introduction into the borehole 3, while than,

  at the same time, it is made of a conductive

  electricity to connect the borehole closure to the earth in accordance with

to the prescriptions.

  The retaining element 16 can advantageously

to be realized in star.

  As shown in the embodiment illustrated in FIG. 1, the metal bushing 12 directed towards the mouth of the borehole can be provided with

  of a sealing element 17 in order to use simultaneously

  this metal sleeve 12 as an element of

  connection for a section of filling tube.

  As shown in Figure 2, the part

  of the filling tube 1 which is located, with the same

  In the connecting hole 19, outside the borehole, the mixing element 27 is mounted following the connecting nipple 19 in the region of the mouth of the borehole. However, this system does not constitute

  that a particular embodiment.

  The nipple 19 is made in the form of a socket and has an internal thread 20. This nipple 19 is screwed on the end.

  filling tube 1 having an external thread

  18 with a fixed spacing 22 between the threads. Before screwing the connecting nipple 19 onto the end of the filling tube 1, the mixing element 27 is slid into the latter and held in place by means of a sealing ring.

  retainer 21 made in the form of a flange. The dis-

  22 between the threads is calculated so that the retaining ring 21 is fixed in its

  position without being damaged.

  When injecting a synthetic resin

  only two components and during the penetration of the components in the filling tube 1, the resin

  synthetic material is first mixed by the

  27 and it advances on the length of the filling tube 1 to the valve 5 provided at the tip of this tube. The valve 8 is actuated by the reflux and the sealing element 2 is inflated until it comes to be placed on the wall 4 of the borehole. Sufficient filling of the element

  2 with a pressure exceeding

  filling operation has the effect of automatically closing

  valve 8 and simultaneously open the valve 5 installed at the tip of the filler tube

  1 so that the injection process can be carried out

tion itself.

Claims (14)

  1. Lost tubular closure for boreholes for injecting suitable media, in particular, for the consolidation of the rock, for example, a synthetic resin, this closure   consisting essentially of a tube of filling   which can be assembled from sections and having, at the tip, a safety against the discharge in the form of a check valve, a   mixing element and a sealing element   in the form of a section of flexible material   at the ends, in metal sockets, characterized in that, within the area surrounded by the sealing element (2), the filling pipe (1) further comprises a valve (8) while the sealing element (2) is made so as to seal and to   can be tightened automatically during injection   depending on the differential pressure created by the valves (5, 8).   Drill hole closure according to Claim 1, characterized in that the valve (8) in the form of a check valve consists of at least one opening (9) opening into the filling tube (1). and surrounded by flexible tubular sleeve (10).   Drill hole closure according to claim 1, characterized in that the bushings   (11, 12) enclosing the element of   The ends (2) are made in the form of tubular sleeves which can be screwed onto the filling tube (1) and spaced apart at a constant distance. Drill hole closure according to Claim 1, characterized in that the height (15) of the metal sleeves (11, 12) each freely receiving the sealing element (2) is calculated to store this sealing element. (2). 5. Drill hole closure according to   claim 1, characterized in that, jointly   with the metal bushings (11, 12), the   (2) may be introduced to any person   where in the filling tube (1).   6. Drill hole closure according to one   any of claims 1 and 5, characterized   in that, at least over a partial length of the height (15), the metal sleeves (11, 12)   are made with a longitudinal slot.   7. Drill hole closure according to claim 1, characterized in that, in. under the safety against discharge, which is arranged at the tip of the filling tube (2) and which is in the form of a check valve (5),   an annular retaining element (16) is provided.   8. Drill hole closure according to one   any of claims 1 and 7, characterized   in that the retaining element (16) made from an electrically conductive raw material,   is at the same time intended for grounding filling tube (1).   Drill hole closure according to Claim 1, characterized in that a sealing element (17) is arranged in the metal bushing (12) directed towards the mouth of the borehole. 10. Drill hole closure according to claim 1, characterized in that at least the metal sleeve (12) directed towards the mouth of the borehole is formed as an element.   assembly for the pipe sections.   Hole closure according to claim 1, characterized in that the end   filling tube (1), which is situated outside the   of the borehole, has an external thread (18) for receiving a connecting nipple (19) can be screwed.   12. Drill hole closure according to   claim 11, characterized in that in the former   the end of the filling tube (1), a mixing element (27) having a retaining ring similar to a flange (21).   13. Drill hole closure according to one of   any of claims 11 and 12, characterized   in that, for housing the retaining ring (21), without destroying it, inside the connecting nipple (19) screwed onto the end of the filling tube   (1), there is provided a counter-nut (23) fixing the disc tance (22) between the threads.   A drillhole closure according to claim 1, characterized in that the element   seal (2) made from an elastic material   the rubber, for example, is reinforced by a support grid (24) made, for example, of fabric or metal.