FR2779766A1 - Fabrication and distribution system for material used to fill/seal mine workings - Google Patents

Abstract

The system has a structure which is designed to be loaded and displaced, and which contains a storage and distribution unit (M1) for cinders (CV), a mixer (9), storage and distribution system (M2) for dry cement and a water distribution system (M3). The latter (M3) is arranged so that it can be adjusted over shaft inputs (4a) of the mine so as to feed and distribute the filling mixture (cinders/cement) into the mine galleries

Description

MANUFACTURING AND

DISTRIBUTION OF CLOGGING SLUDGE

  The invention relates to the technical sector of the treatment of sludge, of its recovery, with a view in particular to ensuring the clogging of mine galleries and the like. It is well known that the exploitation of coal mines in particular leads to the formation of more or less deep underground galleries which tend to

  collapse over time and make the soil unconstructible.

  To alleviate this situation, said galleries are sealed by the insertion of a filling material which is intended to solidify and ensure the filling 1 5 of said galleries. Sludge is generally used which is recovered and treated by adding and mixing different ingredients of the fly ash and cement type, this mixture being made fluid by water. The implementation of this process nevertheless remains empirical to the knowledge of the Applicants. The cement fly ash mixture is generally sprayed using compressed air sources in said galleries. Given the length of the latter, several hundred meters sometimes, the operation is long, inconvenient and does not allow

  systematically and with great reliability, the complete sealing of said galleries.

  In addition, the fly ash - cement mixtures are carried out without precise measurement, in a precarious manner, and there are variations, depending on the filling zones.

  substantial in the quality of the sealing material.

  There is also no automated production allowing the production of sludge

  clogging and their evacuation in-situ in the galleries.

  A first aim sought after, according to the invention, was to remedy these drawbacks by proposing the design of an automated installation making it possible to (treat it

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  quickly and in large quantities the production of sludge and its introduction

in the galleries.

  Another object sought after according to the invention was to design an installation which is autonomous and movable according to the sites thus making it possible to obtain substantial

  productivity gains in said treatment.

  Another desired object of the invention, the installation to be carried out was intended to allow a varied treatment and a varied dosage of the mixture according to the needs in situ.

  and the characteristics of the galleries to be sealed and the surrounding sites.

  According to a first characteristic, the installation for the production and distribution of clogging sludge in a gallery is remarkable in that it comprises a bearing structure capable of being supported and moved, and being designed to receive 1 upstream downstream, means for storing and distributing fly ash in a mixer, means for storing and distributing dry cements in said mixer and means for distributing water in said mixer, the latter being arranged downstream to fit over a well entering the borehole for the transportation and distribution of the mud produced inside the well for

  its evacuation directly into said gallery.

  These characteristics and others will become apparent from the following description.

  To fix the object of the invention illustrated in a nonlimiting manner in the figures of the drawings o: - Figure I is a view illustrating the positioning of an installation on land

  suitable with representation, in section, of the floor illustrating the gallery to be filled.

  - Figure 2 is a large-scale side view of the installation according to Figure 1.

  - Figure 3 is a top view of the installation according to Figure 2.

  - Figure 4 is a rear view of the installation illustrating in particular the area of

cement filling.

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  - Figure 5 is a front view of the installation.

  - Figure 6 is a top view of the mixer illustrating in particular the means

of distribution.

  - Figure 7 is a partial sectional view illustrating the distribution of water in the mixer. In order to make the object of the invention more concrete, it is now described with a

  non-limiting manner illustrated in the figures of the drawings.

  Referring to the drawings, the assembly plant for clogging sludge is referenced, as a whole, by (1) and it is capable of being autonomous so that it can be placed in all appropriate places, and can be transported from one place to another as needed, or on the same place, in different places, to

  follow the path and profile of a mine gallery.

  This installation is arranged to allow filling and sealing of mine galleries (2) using mud (3) manufactured, using a set of wells (4) previously executed and arranged in the ground, at the location of the gallery and penetrating into it. With regard to a determined mine gallery, this is cut into sections (TI, T2, T3, ...), so as to carry out drilling (4) at determined distances. A plurality of boreholes, for a given gallery, are thus formed and have a free end forming an inlet well (4a), on the outside acting as manholes in the inlet and distribution zones of the material treated by the installation. . The installation is then presented successively opposite the various boreholes for filling the corresponding section of gallery. Said installation is arranged with a bearing structure (S) which is capable of being taken over and moved by appropriate means by a lifting and towing structure on the vehicle. This supporting structure (S) thus comprises a frame (5) with a platform receiving, on the one hand, at the rear, means for

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  bearing (6) of the roller type and, on the other hand, at the front, a profiled drawbar (7) with braced connecting bar (7a) allowing the fixing of a traction hook for moving said installation. Furthermore and laterally, the frame (5) receives a plurality of lifting means of the cylinder type (8) or the like making it possible to stabilize said structure in height and horizontally. According to the invention, this supporting structure is arranged to receive from upstream to downstream, means (MI) for storage and distribution of fly ash (CV) in a mixer (9), means (M2) for storage and distribution of dry cements (CS) in said mixer and means (M3) of distribution of water in said mixer, the latter being arranged downstream to adjust to the entry well (4a) of the borehole for the purpose of l routing and distribution of the mud produced inside the borehole

  for its evacuation directly into said gallery.

  1 5 According to the invention, said mixer (9) is arranged, in a very specific manner, to receive, upstream, the fly ash (CV) in the dry state, then the cement in the dry state, then the distribution of water to ensure the mixing of fly ash and cement, the fluidity of the mixture thus produced allowing its evacuation into the borehole (4). The

  mixer is thus designed with known twin screw drive means (9a -

  9b) with intersecting blades (9c) of upstream materials downstream and successively in

  defining the three aforementioned zones and ensuring their progression.

  The fly ash (CV) is thus loaded by a conveyor or directly poured into a hopper (11) using mechanical means such as public works machines. This hopper (I 1) is supported by a supporting structure (12) mounted on the frame (5). Under the hopper (I l), are arranged filtration means (13) making it possible, if necessary, to control the granulometry of the ashes, while the pieces of

  unwanted sections are removed for possible grinding or other treatment.

  The treated ash is evacuated from the bottom of the hopper, in a distribution cone (14), which opens into the first zone (9d) of the mixer. According to an advantageous arrangement, the filling area of the mixer is established for

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  correspond to doses, for example the pitch of the secant blades propeller is chosen

  to match a filling volume.

  Downstream, a second support frame (15) of a supporting structure (16) of a cement bag (17) is disposed. This carrying structure (16) allows the reception of bags commonly called "BIG BAG". These bags are located above a conical hopper (18)

  arranged with vibration blocks (19) allowing the cement to flow.

  The conical end of the hopper (18) is arranged to lead to a metering screw (20) of the Archimedes screw type controlled by a suitable motor means (21). This dosing screw is disposed above the mixer (9) and has at the end (20a) a conduit (22) capable of opening into the upper plane of said mixer, in a zone (9e) downstream of the filling zone of ashes. The

  cement is poured dry into the mixer (9).

  1 5 Means (M3) for collecting and distributing water are arranged on the installation and are controlled using a pump (23) and a motor unit (24) to allow, by a pipe (25 ) appropriate, the introduction of water into said mixer. This water distribution is effected by the addition of a distribution ramp (26) connected to the pipe (25), this ramp being disposed inside the mixer. This ramp has a plurality of projection nozzles (27 - 28). More particularly, the ramp has an angularly oriented nozzle (27) at the entrance to the water circuit allowing water to be distributed over the fly ash - cement mixture. This nozzle (27) is inclined, in an opposite manner, to the zones for introducing the ash and the cement, and thus, downstream of the mixer. This particular arrangement avoids the rise of water in the upstream part of the mixer. Spray nozzles (28) are arranged along the boom over the entire remaining length of the mixer and allow mixing of the fly ash - cement mixture in combination with blades (9c) formed in the mixer, and surrounding the tree (s) (9a - 8b) of the latter. Downstream of said mixer, there is an evacuation zone (29) with conduit

  sludge in the fluid state in relation to the inlet well, in the borehole considered.

  Connecting means ensure the holding of the assembly. Lids or equivalent

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  are mounted at the end of the duct to ensure sealing when not in use. Advantageously, the mixer is on pallets with two shafts mounted coaxially and driven simultaneously or separately at equal or different speeds by known motor means. The mixer is also arranged with manholes (30) accessible from the outside, capable of allowing cleaning and

maintenance of said mixer.

  Access to the ash and / or cement hoppers by maintenance personnel is by

the arrangement of ladders (31).

  Cement dosage means can be used and arranged to allow adaptation of mixtures and volumes of fly ash and cement. The supporting structure 5 is arranged to receive an electrical control box (32) as well as

  means for regulating water distribution.

  Thus, according to the invention, said installation is advantageous in that it is autonomous and allows, in an automated manner, to manufacture clogging sludges from mixtures of fly ash - cement, to present them in a fluid state. , at the outlet of the mixer, and then evacuate them through the borehole (s) immediately formed in the mine galleries. This installation is particularly efficient in that it makes it possible to treat clogging sludge for a volume of

  around 40 m3 per hour, a result that cannot be achieved using previous techniques.

  The installation considered is also very compact, with a small wheelbase, allowing it to be transported by semi-trailers on roads and being

  thus compatible with the safety rules defined by the Highway Code.

  The mixer allows a sequenced distribution of the different successive components of cement fly ash and others. In addition, the pitch of the double screw (9a - 9b) with blades

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  secants (9c) is variable depending on the insertion positions of the flying centers, the

cement and fluid.

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Claims (1)

CLAIMS -1- Installation for manufacturing and distributing clogging sludge in a gallery, characterized in that it comprises a bearing structure (S) capable of being supported and moved, and being arranged to receive upstream in downstream, means (Ml) for storing and distributing fly ash (CV) in a mixer (9), means (M2) for storing and distributing dry cements (CS) in said mixer and means (M3) for distributing water in said mixer, the latter being arranged downstream to adjust to an inlet well (4a) of the borehole with a view to conveying and distributing the mud produced inside the borehole for its evacuation directly into said gallery. -2- Installation according to claim 1, characterized in that the supporting structure (S) comprises a frame (5) with a platform receiving, on the one hand, at the rear, rolling means (6) of the roller type and, on the other hand, at the front, a profiled drawbar (7) with braced connecting bar (7a) allowing the fixing of a traction hook to move said installation, said frame (5) receiving a plurality lifting means of the jack type (8) or the like making it possible to stabilize said structure in height and horizontally. -3- Installation according to any one of claims 1 and 2, characterized in that the mixer (9) is arranged to receive, upstream, the fly ash (CV) in the dry state, then the cement in the dry state, then the distribution of water to ensure the mixing of fly ash and cement, the fluidity of the mixture thus produced allowing its evacuation in the borehole (4), and in that the mixer is thus designed with means of 'double screw drive (9a - 9b) with intersecting blades (9c) of materials from upstream to downstream. -4- Installation according to any one of claims 1 to 3, characterized in that the fly ash (CV) are poured into a hopper (11) supported by a 9 2779766   supporting structure (12) mounted on the frame (5), and in that under the hopper (11), are arranged filtration means (13), and in that the treated ashes are discharged from the bottom of the hopper , in a distribution cone (14), which opens into the first zone (9d) of the mixer.   -5- Installation according to claim 4, characterized in that the filling area of the mixer is established to correspond to doses, and the pitch of the blade propeller   secants is chosen to correspond to a filling volume.   -6- Installation according to any one of claims 1 to 3, characterized in that   that downstream of the reception of the fly ash, a cement distribution hopper is arranged, the end of said hopper is arranged to lead to a metering screw (20) of the Archimedes screw type controlled by a motor means ( 21), and in that this metering screw is disposed above the mixer (9) and has at one end (20a) a conduit (22) capable of opening into the upper plane of said mixer, in a zone (9e ) downstream of the ash filling area, and in this   the cement is poured dry into the mixer (9).   -7- Installation according to any one of claims 1 to 3, characterized in that   means (M3) of water collectors and distributors are arranged on the installation and are controlled using a pump (23) and a motor unit (24) to allow, by a pipe (25), the introduction of water into said mixer, this water distribution being effected by the contribution of a distribution ramp (26) connected to the pipeline (25), this ramp being disposed inside the mixer and including   a plurality of projection nozzles (27 - 28).   -8- Installation according to claim 7, characterized in that the ramp has at the inlet of the water circuit a nozzle (27) angularly oriented for the distribution of water on the fly ash - cement mixture, this nozzle (27 ) being inclined, in an opposite manner, to the zones for introducing the ash and the cement, and thus, downstream of the mixer, spray nozzles (28) being arranged along dc 2779766   the ramp over the entire remaining length of the mixer and allowing mixing of the fly ash - cement mixture in combination with blades (9c) formed in   the mixer, and surrounding the shaft (s) (9a - 8b) of the latter.   -9- Installation according to any one of claims 7 or 8, characterized in that   that downstream of said mixer, there is provided an evacuation zone (29) with conduit for   sludge in the fluid state in relation to the entry well, in the borehole considered.   -10- Installation according to claim 3, characterized in that the pitch of the double screw (9a - 9b) with intersecting blades (9c) is variable depending on the insertion positions of   fly ash, cement and fluid.