FR2560617A1 - DEVICE FOR SEALING HOLES - Google Patents

Abstract

A COLMATOR 1 FOR DRILLING HOLES INCLUDES A TUBE 2 CORNER IN A MOUTH OF A HOLE USING AN INFLATABLE FLEXIBLE PIPE 3 HERMETICALLY AND PERIPHERALLY SUBJECT. AN END 25 OF THE TUBE HAS A CONNECTION 5 OF INTAKE OF CONSOLIDATION LIQUID AND A NON-RETURN VALVE 6, ITS OTHER END 23 HAVING A CLOSURE 7 OPENING ACCORDING TO THE PRESSURE. RADIAL CHANNELS 8, DRILLS IN THE TUBE 2 BETWEEN THE FITTING 5 AND THE CLOSURE 7, ARE HERMETICALLY CLOSED, BY AN ELASTIC BLOCKER 12 INCORPORATED IN A CIRCUMFERENTIAL THROAT 18 OF THE SAID TUBE, IN THE SENSE OF THE RETURN OF THE LIQUID TO THE INSIDE OF THE TUBE .

Description

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  DEVICE FOR SEALING HOLES

  The present invention relates to a device intended to seal a drilled hole made in a rock bedding or in a brittle masonry, hole by means of which a fluid and hardening consolidating agent is injected.

  under pressure in rock or masonry.

  It is possible to increase the solidity of a crumbling rock (cracked) or of a brittle masonry by injecting or introducing under pressure, into the cracks, the

  crevices, limes or fractures, a consolidating agent

  date which hardens after injection.

  The consolidating agent, generally liquid, is intro-

  goes right through, under strong pressure reaching

  up to 150 bars, through holes

  previously developed in rock or masonry.

  Thus, this high pressure makes it necessary to seal the holes hermetically, in the vicinity of their mouth, in such a way that the consolidating agent is prevented from flowing back and from

out of said drilled holes.

  Clogging devices, used until now in particular in underground mining operations and being in the form of known impregnation probes,

  are always again extracted from the holes drilled upon purchase

  Introduction work under pressure, then assigned for later use. In this case, however, great care must be taken to ensure that the consolidating agent is

  also sufficiently hardened. In fact, the impregnation probes

  tion are very often extracted from the drilled holes when the consolidating agent has not yet hardened. This last one is

  then thrown out of the drilled holes and it causes injuries

safe intervention teams.

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  The object of the invention is therefore to propose measures by which it is possible to avoid for sure that still liquid consolidation product leaves the drilled holes. According to the invention, this object is achieved by the fact that the device comprises a tube which, blocked in

  the mouth of the drilled hole using an inflatable hose

  ble hermetically fixed in the peripheral direction, has at one of its ends a connection allowing the admission of the consolidation liquid as well as a non-return valve and, at its other end, a closure which opens according to

  pressure, the longitudinal area between said connection

  cord and said closure having a junction between the internal space of the tube and the chamber delimited on the one hand

  by the inflatable flexible hose and on the other hand by the external surface

  tube, said junction accommodating a blocker which prevents the reflux of the consolidation liquid towards the internal space

of the tube.

  The essential characteristic of the device of the invention

  tion lies in the fact that this plug for drilled holes

  Admittedly, injects the consolidating agent into a rock bedrock or into friable masonry, but that, unlike an impregnation or injection probe, said plugger remains in the mouth of the drilled hole . After the

  shutdown of the pump which delivers the consolidating agent

  tion compressed in rock or masonry, the colmateur prevents in this condition the consolidating agent still

  liquid spurting out of the drilled holes and injuring the equi-

pes interveners.

  To this end, the hole sealer has at its

  external end a connection for the intake of the consumer liquid

  lidation. The supply conduit for this liquid is therefore adjusted on said fitting. Consolidation liquid penetrates

  inside the tube via the check valve

  return and closure provided at the inner end of this tube

  prevents the said liquid from overflowing into the rock or the mason-

  nerie. When a determined pressure has been reached, the

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  blocker incorporated in the junction between the internal space of the tube and the chamber interposed between the inflatable flexible tube and the surface of said tube opens, so that the liquid of

  consolidation can enter this chamber and iron press

  inflatable hose against rock or masonry at

  neighborhood of the drilled hole. This liquid cannot leave the chamber.

  bre neither forwards nor backwards, because the inflatable flexible hose is kept hermetically applied to the tube by sockets at the inner and outer ends of said tube. When the consolidation liquid continues to flow,

  the pressure prevailing inside the natural continuous tube-

  ment to grow until it reaches a value such that the closure opens and allows the injected liquid to

  reach freely into rock or masonry.

  When the injection process is complete and the liquid pressure has dropped to zero, the flexible hose

  inflatable continues to be pressed against rock or masonry-

  due to the fact that the blocker incorporated in the junction prevents the consolidation liquid from flowing back into the internal space of the tube from the chamber located between said

  inflatable hose and the surface of said tube.

  According to another improvement of the invention, the connector can be produced in the form of a threaded sleeve with an external thread. This characteristic facilitates both the coupling to an intake pipe of the consolidation liquid and the

  uncoupling from this conduit once the injection is complete.

  The non-return valve housed in the threaded sleeve prevents the consolidation agent, possibly still liquid, from flowing outwards. Thus, it is possible to already inject into the next drilled hole, without having to

  wait for the curing agent to harden. The con-

  inlet hose screwed onto the external thread of the sleeve

  In addition, in this case constitutes a safety device.

  tee which prevents the inflatable flexible hose subjected to pressure,

  to slip out of the drilled hole relative to the tube.

  According to an advantageous embodiment of the check valve

  return incorporated in the threaded sleeve, this non-return valve

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  located on the side of the connector may consist of a spherical valve, a seat formed on a sheath force fitted into the threaded sleeve, as well as a helical spring of

  compression which presses said shutter against said seat.

  These are simple elements that require no maintenance and are easy to manufacture and assemble. Judiciously, the stop of the compression coil spring is

  formed by a bolt or stud that is pushed through

  dirty through the tube but does not protrude beyond

from the periphery of the latter.

  According to another characteristic, the blocker located in

  the radial junction consists of a radially expandable packing

  which, owing to the inherent elasticity of which it is

  gifted, is hermetically embedded in a circumferential groove-

  the shaped in the middle region of the tube. This packing can consist for example of a flexible pipe which covers

  transverse channels developed in the wall of the tube.

  However, the packing can be lifted away from the channels under the effect of the pressure of the consolidation liquid, so that this liquid can penetrate into the chamber interposed between the inflatable flexible pipe and the surface of the tube, passing in look at the edges of said lining. When the

  consolidation liquid stops flowing, the packing applies

  again automatically on the channels, so that the liquid located in the chamber between the flexible hose

  inflatable and the tube surface cannot flow back into the space

  this internal of said tube and thus maintains said pipe

  flexible pressed against the wall of the drilled hole.

  According to another characteristic of the invention, the closure

  ture which is at the inner end of the tube, and which prevents

  che the consolidation liquid to be discharged into the rock or the masonry until the inflatable flexible pipe is irreproachably applied against the wall of the drilled hole,

  has a deformable blocking member under pressure.

  In one embodiment, the blocking member may consist of a plastic ball interposed between a

  body shaped as a socket forming a seat and a counter-stop.

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  This ball retains its shape as well as its blocking function.

  ge as long as the pressure inside the tube is not yet sufficient to push said ball through the body consisting of a seat socket. It is only when the pressure is high enough (which means that the inflatable flexible pipe bears blamelessly against the wall of the drilled hole) that the ball is deformed by the pressure of the consolidation liquid and is pushed to

  through the seat socket. After leaving and entering

  tration in the drilled hole, this ball then frees the flow path of the consolidation liquid as far as in

rock or masonry.

  - According to another embodiment, the blocking member

  may consist of a ball or a plastic cap

  tick force-fitted into the inner end of the tube. In this case, there is neither a counter-stop, nor a body shaped as a socket forming a seat. The plastic ball or plug follows the dimensions of the inner end of the tube, so that this ball or plug cannot deform, and leave the inner end of the tube to enter the

  rock or masonry, only when corner pressure prevails

  flawlessly slicing the inflatable hose, which releases

  the injection route of the consolidation liquid.

  In addition, the counter-stop can be constituted by a retaining stud which crosses transversely the internal end of the tube, protrudes peripherally beyond this

  tube and forms a stop for the inflatable hose. The avan-

  The stage of this embodiment consists in that the retaining stud prevents the inflatable flexible pipe from moving relative to the tube in the case where this flexible pipe under pressure

would show such a propensity.

  The invention will now be described in more detail, by way of nonlimiting examples, with reference to the appended drawing in which: FIG. 1 is a vertical longitudinal section of a plug for drilled holes; and FIGS. 2 and 3 are fragmentary vertical longitudinal sections respectively illustrating two other embodiments of the internal extreme zone of the collector

of figure 1.

  In FIG. 1, the reference 1 designates a sealer for drilled holes, by means of which a liquid consolidating agent can be injected into a collapsible rock (cracked) or into friable masonry, not shown in detail. The sealer 1 remains in the drilled hole after the consolidation liquid has been introduced therein under pressure, and it prevents consolidation liquid which has not yet hardened from

get out of said hole.

  Colmator 1, which can be engaged in the vicinity of the em-

  mouth of the drilled hole, has a rectilinear tube 2 which can be permanently fixed in said mouth of the hole to

  using an inflatable flexible hose 3 fixed in the peripheral direction

  risk. This flexible hose 3 is radially expandable and it is hermetically fixed on the tube 2, by its ends, to the

socket means 4.

  At its outer end 25, the tube 2 comprises a connection 5 for admitting the consolidation liquid, as well as a non-return valve 6. At its inner end 23, said tube is

  provided with a closure 7 which opens as a function of the pressure.

  A junction, formed by several radial channels 8 and connecting the internal space 9 of the tube to a chamber 11 delimited on the one hand by the inflatable flexible pipe 3 and on the other hand by the surface 10 of said tube, is produced in the area longitudinal between the connector 5 and the closure 7. A blocker 12,

  incorporated in this junction 8, prevents the liquid from consolidating

  flow back from the chamber 11 into the internal space 9 of the

tube.

  FIG. 1 also shows that the connection 5 is produced in the form of a threaded sleeve with an external thread 13. An inlet pipe for the consolidation liquid is screwed onto this thread 13. The non-return valve 6 housed in the threaded connection 5 consists of a spherical shutter 14, a seat developed on a sheath 16 force-fitted into said fitting 5, as well as a helical spring 17 which presses

  said shutter 14 against said seat 15.

  The blocker 12 incorporated in the radial junction (channels 8) in the median longitudinal region of the tube 2 is constituted

  by a flexible hose type lining which, expandable radially,

  Lely, is hermetically embedded due to its own elasticity in a circumferential groove 18 formed

  peripherally with respect to the junction channels 8.

  The closure 7 at the internal end of the tube 2 comprises a ball 19 of plastic material interposed between a body 20 shaped as a socket forming a seat and a counter-stop 21 of the stud type. This counter-stop stud 21 projects radially beyond the surface 10 of the tube and it serves as

inflatable hose stop 3.

  Figure 2 illustrates a closure 7 'in which a plastic plug 22 is pressed into the end

internal 23 of the tube.

  In the embodiment of a closure 7 "according to Figure 3, there is provided a ball 24 of plastic material which

  is pressed into the end 23 of the tube.

  The injection process takes place as follows:

  first of all, the intake pipe for the consolidation liquid

  tion, not shown in detail, is screwed onto the threaded connection 5. This intake duct thus concomitantly forms a locking element because the flexible pipe 3 cannot be

move relative to tube 2.

  The consolidation liquid, which enters the internal space 9 of the tube via the non-return valve 6 after the pump has started, first pushes the ball 19 against the body 20 forming a seat, preventing so that the consolidation liquid overflows into the rock or

  the masonry leaving the tube 2.

  When a certain pressure is reached, the blocker

  12 expands in the middle area of the tube and the injected liquid

  tee can penetrate, through the channels 8, in the chamber 11 located between the tube 2 and the inflatable flexible pipe 3. In this case, said pipe 3 expands radially and it applies

  tightly against the wall of the drilled hole.

  When the pressure continues to increase during the injection

  tion of the liquid by force, the ball 19, when it is subjected to a predetermined pressure, passes through the body 20 by deforming and engages in the drilled hole allowing the free passage of the consolidation liquid in the rock or

masonry.

  When the injection process is complete and the

  pump pressure has been reduced to zero, the check valve

  return 6 prevents the not yet hardened consolidation liquid from exiting through the external end 25 of the tube. However, the inflatable flexible pipe 3 continues to be pressed against the wall of the drilled hole, because the blocker 12 with seal closes the channels 8 opening into the internal space 9 of the tube, so that the liquid cannot overflow from the

  chamber 11 in the internal space 9 of said tube.

  After the pressure has been reduced to zero, the intake duct can be unscrewed without any risk from the threaded connection 5, since the non-return valve 6 and the flexible pipe 3 pressed against the wall of the hole prevent the liquid

  consolidation to flow out of the rock or mason-

  nerie. It goes without saying that many modifications can be made to the device described and shown, without departing from the

part of the invention.

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Claims (8)

  1. Clogging device for a hole drilled in a cracked rock or friable masonry, hole by means of which a fluid and hardening consolidating agent is injected under pressure into said rock or said masonry, device characterized in that it has a tube (2)   stuck in the mouth of the drilled hole with a hose   inflatable seat (3) hermetically fixed in the peripheral direction   that, this tube having at one (25) of its ends a fitting (5) for admitting the consolidation liquid as well as a non-return valve (6) and, at its other end (23),   a closure (7; 7 '; 7 ") opening according to the pressure   sion, the longitudinal area between said fitting (5) and said closure (7, 7 '; 7 ") being provided with a junction (channels 8) between the internal space (9) of said tube and the chamber (11) delimited on the one hand by said flexible pipe (3) and on the other   leaves through the surface (10) of said tube, a blocker (12) prevents   singing the reflux of the consolidation liquid towards space   internal (9) of the tube being incorporated in said junction (8).   2. Device according to claim 1, characterized in that the connector (5) is produced in the form of a   threaded sleeve with external thread (13).   3. Device according to one of claims 1 and 2,   characterized by the fact that the non-return valve (6) located on the side of the connection consists of a spherical shutter (14), of a seat (15) formed on a sleeve (16) force fitted into the threaded connection (5), as well as a helical compression spring (17) which pushes said shutter (14) against said seat (15).   4. Device according to claim 1, characterized in that the blocker (12) located in the radial junction (8) is formed by a radially expandable lining which, due to the inherent elasticity with which it is endowed, is hermetically embedded in a circumferential groove (18)   shaped in the middle region of the tube (2).   5. Device according to claim 1, characterized by the   causes the closure (7; 7 '; 7 ") to have a locking member   cage (19; 22; 24) deformable under pressure.   6. Device according to claim 5, characterized in that the blocking member consists of a ball (19) of plastic material interposed between a body (20) shaped as   a socket forming a seat and a counter-stop (21).   7. Device according to claim 5, characterized in that the blocking member consists of a ball (24) or a plug (22) of plastic force fitted in the internal end (23) of the tube.   8. Device according to any one of the claims   at 7, characterized in that the counter-stop is formed   killed by a retaining stud (21) which crosses transverse-   ment the inner end (23) of the tube and projects peripherally   rique beyond this tube (2) by forming a stop for the inflatable flexible hose (3).