EP0342457B1 - Vorrichtung und Verfahren zum Aufbereiten von mineralischen Dichtungsstoffen - Google Patents

Vorrichtung und Verfahren zum Aufbereiten von mineralischen Dichtungsstoffen Download PDF

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Publication number
EP0342457B1
EP0342457B1 EP89108195A EP89108195A EP0342457B1 EP 0342457 B1 EP0342457 B1 EP 0342457B1 EP 89108195 A EP89108195 A EP 89108195A EP 89108195 A EP89108195 A EP 89108195A EP 0342457 B1 EP0342457 B1 EP 0342457B1
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EP
European Patent Office
Prior art keywords
kneading
water
mixer
sealing material
comminuting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89108195A
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German (de)
English (en)
French (fr)
Other versions
EP0342457A2 (de
EP0342457A3 (en
Inventor
Klaus Ing. Grad. Liedemann
Karl-Heinz Ing. Grad. Heisler
Günther Dipl.-Ing. Möllers
Horst-Dieter Dipl.-Ing. Schröder
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STRABAG BAU-AG
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STRABAG BAU-AG
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Application filed by STRABAG BAU-AG filed Critical STRABAG BAU-AG
Publication of EP0342457A2 publication Critical patent/EP0342457A2/de
Publication of EP0342457A3 publication Critical patent/EP0342457A3/de
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/004—Sealing liners

Definitions

  • the invention relates to a device for processing mineral sealants, in particular clay or similar cohesive materials, for a surface seal, in particular for landfills of domestic and special waste or other pollutants, with a crushing device for crushing the sealants.
  • the soil By processing the soil by milling from the surface, the soil is indeed circulated in more or less large clods; However, it can only be crushed and compacted to a limited extent by further operations, which is not sufficient to obtain a homogeneous, water-impermeable layer of sufficient thickness.
  • the object of the invention is to provide a device with which mineral sealants consisting exclusively or predominantly of cohesive constituents, such as clays or the like, can be prepared from soft to very hard consistency so that they become homogeneous and over a long period Dense sealing layer can be processed over time.
  • a device which comprises a water supply device, a first box feeder for continuously metering and allocating the various components of a first mineral sealing material, a roller crusher for comminuting and stretching all base components, and a twin-shaft mixer with pressure zone and chips for kneading of the floor components and other components to form a homogeneous, low-void sealing compound.
  • roller crusher While it is not possible to crush hard clays obtained in coarse clods by crushing crushers in crushers, the use of a roller crusher enables pre-crushing even very hard clays and silt. Due to the counter-rotating comb rollers, which have welded-on cams, the clay is not broken up, but cut and crushed. This way of working of the roller crusher enables not only the crushing of hard, but also the crushing of soft and tough plastic sealing materials as well as the crushing of individual stones, insofar as they are contained in the sealing material to be processed.
  • the material which has been pre-shredded in this way is then not only forcibly mixed in the subsequent units, in particular in the twin-shaft mixer, but also kneaded under high pressure and cut into small pieces as it emerges from this compulsory mixer, so that it is transported further in the form of a loose pile and in place and Place installed and can be compacted with smooth wheel and padfoot rollers.
  • the special design and mode of operation of the aggregates selected according to the invention for the processing plant make it possible to shred the cohesive material down to a grain size in the cm range and thereby expose the largest possible mineral surface on which sufficient liquid can accumulate in order to achieve the desired homogeneity and To achieve plasticity and to prevent that dry clay grains of larger diameter are embedded in a soft plastic clay mortar, which give rise to cracks after installation and the associated permeability of the seal.
  • Knetrasplers have two radially arranged, partially cylindrical bottoms, which are provided with holes or slots and in which rotors equipped with kneading blades work, which shred the sealing material and press it through the holes and slots, the material being further kneaded and loosened and a larger one Preserves surface.
  • a blow bar mill can also be arranged between the roller crusher and the mixer instead of the Knetrasplers.
  • a second box feeder can be provided for metering and dispensing a second mineral sealing material, e.g. a pure clay, in order to favorably influence the composition of the overall mixture .
  • a kneading razor with perforated or slotted, double-trough-shaped bottoms and rotatably arranged rotors with kneading blades can be provided, in the upper part of which at least one steam nozzle can be arranged.
  • the initially pre-shredded clay mineral can be fed in a uniform flow to the kneading and fine-grinding device, where a first part of the water is first supplied to the mineral in the form of water vapor during the kneading and shredding process and where after the shredded and moistened clay mineral a second part of the water is fed in several stages in finely divided form as it emerges from the comminution device and during further conveying.
  • a feed device is provided between the roll crusher and the mixer for any dry additives to be fed.
  • the water inlet for metering and allocating water is expediently arranged on the mixer, since the added water can only be introduced into the material by intensive kneading and mixing in such a way that uniform dampening of the entire material is achieved, which is the prerequisite for achieving the sealing effect when subsequent installation and compression.
  • the box feeder upstream of the system which can be equipped with a pre-shredding and loosening shaft for the material being fed, enable continuous operation, which is a prerequisite for the sensible operation of the twin-shaft mixer and also the Knetrasplers, and which makes it possible for a surface seal of greater thickness process the required large masses in a reasonable time and make them available for ongoing installation.
  • the continuous conveyor which conveys the sealing material from the kneading razor and where further moistening of the material takes place, is a belt conveyor, and if the impellers for turning the conveyed material are fastened to rotatable shafts arranged essentially perpendicular to the conveying surface.
  • the pre-shredding shaft can be equipped with beaters and / or knives and can be arranged at the outlet of the conveyor box of the box feeder.
  • a rolling mill can be arranged after the kneading razor or instead of the kneading razor, which has at least one first pair of rolls with two rolls rotating in opposite directions at different speeds.
  • This first pair of rollers can be followed by a further pair of rollers, the nip of which is narrower than the nip of the first pair of rollers and whose rollers rotate in opposite directions at different speeds.
  • the sealing material in the roll gap of the first pair of rolls is first stretched and formed into small-sized, thin-walled, flaky plates, which may be moistened and then changed in their structure again in the narrower roll gap of the second pair of rolls, by changing the near the a surface of the platelet mineral particles against the mineral particles, which are arranged in the vicinity of the opposite surface, with the formation of new fracture surfaces on which water can accumulate.
  • the processing plant 10 shown in FIGS. 1 and 2 has a first box feeder 11 and a second box feeder 12, of which the first box feeder 11 receives the cohesive bottom 13 suitable for sealing, which is used on the site to be sealed, which is used for a landfill is pending and solved there and stored temporarily in a pile 14.
  • the box feeder 12 is loaded with a loading vehicle 15 with clay 16, which was brought in from a foreign deposit and temporarily stored at another storage location 17.
  • the soil material 13 fed into the feed box 11a of the box feeder 11 is drawn off with the plate belt 11b of the box feeder 11 and discharged in a uniform quantity flow with a loosening and pre-shredding shaft 11d arranged at the outlet end 11c of the box feeder, which is also called "reel shaft” first conveyor belt 18 dropped.
  • the clay 16 fed into the second box feeder 12 is brought onto the first conveyor belt 18 in the desired dosage from its plate belt 12b and the reel and pre-shredding shaft 12d.
  • the first conveyor belt 18 conveys the various components of the mineral sealing material, namely the cohesive base 13 and the clay 16, into a roller crusher 19 which is equipped with two counter-rotating comb rollers 21, on which cams (not shown here) are welded. Wipers, also not shown in the drawing, are used to clean the grooves of the comb rollers.
  • the coarse sealing material that arrives in the roller crusher 19 and accumulates in coarse clods in the deposits is further crushed in the roller crusher 19, with broken stones being broken down to a size that can be processed by the subsequent processing units and is harmless to the seal to be installed.
  • the further shredded sealing material passes from the roll crusher via a second conveyor belt 20 into a kneading razor 22, which is shown in more detail in FIG. 5 in a cross section.
  • the Knetraspler 22 consists of an elongated housing 23 in which two part-cylindrical troughs 24 and 25 are formed, the bottoms 26 and 27 of which are made of perforated or slotted, strong sheets which are connected to one another in the longitudinal direction in the middle of the housing, so that the the two partially cylindrical troughs overlap in their upper cylinder space.
  • a rotor 28 and 29 is rotatably supported, which is equipped with kneading blades 30 and 31, respectively.
  • the rotors 28 and 29 with their kneading blades 30 and 31 rotate in opposite directions in the housing 23, knead the given, binding sealing material and press it down through the holes or slots in the bottoms 26 and 27. During the kneading process, the material is moistened with water or steam which emerges from spray nozzles 32 in the upper part of the housing 23.
  • the material coming in the form of small pieces or pellets from the kneading razor 22 is or the like via a funnel, a slide. thrown onto a third conveyor belt 33 and arrives with it into a double-shaft mixer 34.
  • This double-shaft mixer 34 has two mixing shafts 34a and 34b arranged side by side, which are provided with mixing knives in their front part in the direction of transport and with pressure screws in the rear part.
  • a silo 35 for additives for example for water glass or clay powder, is arranged, from which the additives are added to the sealing material coming from the kneading razor 22 on the third conveyor belt 33 via a conveyor trough or a screw conveyor 36.
  • a water tank 37 On the opposite side of the mixer 34 there is a water tank 37, from which a line 38 leads to the feed point 34c of the twin-shaft mixer 34 and to the kneading razor 22 and possibly also to the roller crusher 19.
  • a line 38 leads to the feed point 34c of the twin-shaft mixer 34 and to the kneading razor 22 and possibly also to the roller crusher 19.
  • the amount of water supplied to the individual units 19, 22 and 24 can be regulated.
  • All of the components of the mineral sealing material and the additives fed into the twin-shaft mixer 34 are first thoroughly kneaded and mixed and evenly moistened, together with the water added to the feed point 34c of the mixer, by the mixing shafts 34a and 34b, with the kneading action of those working against each other Screws to the mixer outlet 34d be pressed.
  • a shredder 34e which cuts off the mass strand emerging through relatively narrow openings piece by piece.
  • the pieces then reach a fourth conveyor belt 40, which conveys the homogeneous, low-void sealing compound onto a stockpile 41. From there, the prepared sealing compound is then brought to the installation site by transport vehicles 42, only one of which is indicated in the drawing, and installed there in layers and carefully compacted in layers with padfoot rollers and smooth wheel rollers.
  • the soil can also be temporarily stored in various storage locations if the content of cohesive constituents is different at different locations on the extraction area. Then more than two, for example three, four or even five box feeders are used, which are assigned to the different supply points and with which different amounts of these components can be fed onto the first conveyor belt 18.
  • the knee razor 22 can also be replaced by a blow bar rolling mill 43, which is shown schematically in FIG. 6.
  • a blow bar rolling mill is particularly suitable when the cohesive material to be prepared from medium-hard clays, slate clays or the like. exists and occurs in very coarse clods or contains large amounts of stones.
  • a rapidly rotating beater roller 45 with a smaller diameter and a counter roller 46 with a larger diameter are mounted, in the roller gap 47 of which the sealing material 48 to be shredded is fed with a funnel 49.
  • the smaller beater roller 45 carries beater bars 50 on its circumference and rests in fixed bearings.
  • the counter roller 46 has one smooth roller jacket and is supported at one end of angle levers 51 in such a way that it can pivot about the eccentrically located angle axis 52.
  • the free ends 51a of the angle levers are loaded by strong springs 53 which tend to pivot the angle levers 51 so that the counter roller 46 is pressed against the beater roller 45.
  • FIG. 3 and 4 another embodiment of the processing device according to the invention is shown, in which an almost stone-free but plastic clay 16 is added to a cohesive soil 13 obtained on the spot and containing individual stones, which intensively pre-comminutes and processes required before it can be processed by the roll crusher and the downstream units.
  • the cohesive soil material lying on a pile 14 is fed from a box feeder 11 in a continuous, constant volume flow onto a first conveyor belt 18, which throws this material into the roller crusher 19.
  • the clay 16 also arrives in this roller crusher 19, but is specially prepared beforehand, as can be seen in particular in FIG. 4.
  • a second box feeder 12 is again provided, which crushes the coarse clay mineral with a loosening and comminution roller 54 arranged at the end of the box feeder and feeds it to a kneading razor 22 via a continuous conveyor 55 Structure has already been described above.
  • the steam nozzles 32 in the upper part of the Knetrasplergepuruses 23 are supplied with water vapor, which is generated in a steam generator 56.
  • the steam generator 56 receives the water required for steam generation from one Water metering system 57, the water being taken from a tank 58 and fed to the water metering system 57 by a pump 59 via a flow meter 60.
  • the clay material crushed in the kneading razor 22 and moistened with water vapor falls on a second continuous conveyor 61, which guides it into the roller crusher 19.
  • a plurality of water nozzles 62 are arranged at a distance from one another in the longitudinal direction of the continuous conveyor 61 and are supplied by a second water line 63 which is connected to the water metering system 57.
  • a plurality of agitator blades 64 which are arranged at the level of the conveying surface of the continuous conveyor 61 and are fastened to rotatingly driven shafts 65 which are substantially perpendicular to the conveying surface.
  • the preparation system consisting of the box feeder 12, the kneading razor 22 and the downstream conveying and moistening device 61 can also be used for certain sealants in a preparation process in which the coarse, dry clay mineral from the box feeder 12 is fed to the kneading razor in a uniform flow after it was shredded into roughly fist-sized pieces by the pre-shredding shaft 54 of the box feeder. This clay mineral is then further comminuted in the kneading razor 22 by the kneading blades 30 and 31 and moistened by the water vapor blown in through the steam nozzles 32.
  • the further crushed and moistened clay mineral is then finally pushed through the holes and slots of these trays 26 and 27 by the end faces of the kneading blades, which run closely over the perforated bottoms 26 and 27 of the troughs, whereby the piece or grain size of the clay mineral is further reduced .
  • a rolling mill 66 can also be provided, in which the sealing material is homogenized even further before it reaches the stockpile 41.
  • This rolling mill 66 has a first pair of rollers 67 and a second pair of rollers 68, the rollers 67a and 67b or 68a and 68b of which rotate in opposite directions at different speeds.
  • the nip between the rollers 68a and 68b of the second pair of rollers 68 is slightly smaller than the nip of the pair of rollers 67.
  • the clay material fed into the hopper 69 of the rolling mill 66 is stretched between the rolls and shaped into flat platelets, being subjected to a shear stress and crumbling before it reaches the stockpile 41.
  • the invention is not limited to the exemplary embodiments shown and described, but several changes and additions are possible without leaving the scope of the invention.
  • other cohesive earth building materials such as for example loam or cohesive soil mixtures.
  • belt conveyors shown and described instead of the belt conveyors shown and described, to use other continuous conveyors, such as, for example, trough chain conveyors or plate belt conveyors, which leave the processed material in a largely still crumbly structure.
  • trough chain conveyors or plate belt conveyors which leave the processed material in a largely still crumbly structure.
  • two pairs of rollers even more pairs of rollers can be arranged in the rolling mill.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Hydrology & Water Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacturing And Processing Devices For Dough (AREA)
  • Crushing And Pulverization Processes (AREA)
EP89108195A 1988-05-18 1989-05-06 Vorrichtung und Verfahren zum Aufbereiten von mineralischen Dichtungsstoffen Expired - Lifetime EP0342457B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3816872 1988-05-18
DE3816872A DE3816872A1 (de) 1988-05-18 1988-05-18 Verfahren und aufbereitungsanlage zum herstellen einer flaechendichtung

Publications (3)

Publication Number Publication Date
EP0342457A2 EP0342457A2 (de) 1989-11-23
EP0342457A3 EP0342457A3 (en) 1990-05-16
EP0342457B1 true EP0342457B1 (de) 1991-10-23

Family

ID=6354600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108195A Expired - Lifetime EP0342457B1 (de) 1988-05-18 1989-05-06 Vorrichtung und Verfahren zum Aufbereiten von mineralischen Dichtungsstoffen

Country Status (6)

Country Link
EP (1) EP0342457B1 (cs)
DE (2) DE3816872A1 (cs)
DK (1) DK212989A (cs)
ES (1) ES2027433T3 (cs)
IE (1) IE891584L (cs)
PT (1) PT90594A (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3915768A1 (de) * 1989-05-13 1990-11-22 Rheinische Braunkohlenw Ag Verfahren und vorrichtung zur entnahme einer bodenprobe aus der abdichtung einer deponie

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE888822C (de) * 1950-11-16 1953-09-03 Carl Schenck Maschinenfabrik D Zerkleinerungsvorrichtung fuer schwer teilbares Gut, wie Lehm od. dgl.
DE1163217B (de) * 1959-07-25 1964-02-13 Flii Bedeschi Fa Misch- und Reinigungsvorrichtung fuer Ton
DE1759317A1 (de) * 1968-04-20 1971-06-03 Inpaco Trust Reg Periodisch arbeitender Schneckenmischer fuer Beton,Moertel,Asphalt und andere Mischkomponenten
US3732697A (en) * 1972-01-14 1973-05-15 R Dickson Waste disposal method and facility
DE2346159C2 (de) * 1973-09-13 1985-03-07 Karl Händle & Söhne Maschinenfabrik u. Eisengießerei, GmbH & Co KG, 7130 Mühlacker Knetraspler für Ton oder tonähnliche Massen
CH640752A5 (de) * 1979-08-27 1984-01-31 Meyer Josef Ag Emmen Walzenbrecher, insbesondere fuer tongestein, und verfahren zu seinem betrieb.
DE3128337A1 (de) * 1981-07-17 1983-01-27 Heilit + Woerner Bau-Ag Dichtungsmasse auf tonbasis zur herstellung von dichtungsschichten im bauwesen
DE3544140A1 (de) * 1985-12-13 1987-06-19 Bhs Bayerische Berg Verfahren und einrichtung zur herstellung von verarbeitungsfaehigen daemmbaustoffen

Also Published As

Publication number Publication date
EP0342457A2 (de) 1989-11-23
DE58900394D1 (de) 1991-11-28
EP0342457A3 (en) 1990-05-16
DK212989A (da) 1989-11-19
DK212989D0 (da) 1989-05-02
DE3816872C2 (cs) 1990-10-04
DE3816872A1 (de) 1989-11-23
PT90594A (pt) 1989-11-30
ES2027433T3 (es) 1992-06-01
IE891584L (en) 1989-11-18

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