US20230250596A1 - Apparatus and method of treating soil - Google Patents

Apparatus and method of treating soil Download PDF

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Publication number
US20230250596A1
US20230250596A1 US18/004,637 US202118004637A US2023250596A1 US 20230250596 A1 US20230250596 A1 US 20230250596A1 US 202118004637 A US202118004637 A US 202118004637A US 2023250596 A1 US2023250596 A1 US 2023250596A1
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Prior art keywords
soil
road
binder
movable
idea
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Juha Leppaenen
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Betolar Oy
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Betolar Oy
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1054—Preparing mixtures of which at least part of the solid ingredients has previously been deposited on the surface, excluding penetrating or surface dressing, e.g. in situ mixing, mixing involving lifting of spread or windrowed aggregate

Definitions

  • the invention relates to a new solution for utilization and treatment of hardenable materials and masses.
  • the invention relates to the use of stabilizing materials in road and foundation structures and to an apparatus and a method applicable to this purpose.
  • the length of the whole road network in Finland is approximately 454 000 kilometres.
  • the road network consists of state-owned roads, streets maintained by municipalities and privately maintained private roads. The roads are classified according to their importance as class I main roads, class II main roads, regional roads and connecting roads. Finland is a sparsely populated country with long geographical distances to municipal centres. Funding for maintenance of the general road network has been cut down, whereby the main emphasis of road maintenance has had to be focused on developing the main road network. This has led to deterioration of the condition of the lower-grade road network.
  • the challenges in road network maintenance include, in addition to the reduced funding, an increasing traffic load exerted on the road structure and availability of good-quality stone material.
  • the idea of the invention to provide a new and improved apparatus and method for road and earth construction.
  • the idea of the proposed solution is that the road or foundation structure is stabilized by means of a movable apparatus.
  • soil or stone material is removed from ground or from the structure and it is treated in the apparatus with one or more binders to improve its compression strength.
  • the apparatus is a movable vehicle which comprises a blade device for removing the soil from ground surface or road structure.
  • the apparatus has a loading space for receiving the removed soil and a transfer device for transferring the removed soil from the blade device into the loading space.
  • One or more binders may be fed into the removed soil arranged in the loading space or generally carried by the apparatus by a feeding device.
  • the materials in the loading space may be mixed by a mixing device to form a homogeneous mass.
  • the formed binder-treated mass may be spread by a spreading device of the apparatus back to the ground surface from where it was earlier removed by the blade device.
  • the apparatus is configured to remove soil from the ground, foundation structure or road surface, to circulate it through a mixing process and to install the treated stabilized soil back to the place from where it was taken. After the treatment, only one or more binders and optional water to moisten the mixture may have been added to the soil. No external stone material is thus added to the soil in the treatment.
  • the proposed solution is that by the apparatus, soil may be treated significantly faster and more efficiently as compared to a stabilization treatment in which the stabilizing material is spread onto the ground surface and mixed with the surface soil.
  • the treatment may be performed as a unitary and continuous process in which the soil is removed, taken onboard the apparatus for treatment and laid back after stabilization.
  • the treatment of the soil is smooth and it provides a cost-efficient method for refurbishment and construction of roads, streets, tracks, fields and foundations. Further, the proposed solution is logistically efficient and thus environmentally friendly.
  • the apparatus is an autonomously movable vehicle having its own driving equipment and power supply.
  • the apparatus may thus be an autonomously operating mobile unit or a movable work machine.
  • the apparatus is a trailer, a towable vehicle which may be moved by means of a separate work machine, such as a tractor or a bucket loader.
  • the apparatus is configured to treat soil as a continuous process and wherein the treatment of soil is carried out while the vehicle is moving forward in relation to the ground surface.
  • the process stages of removal, mixing, binder feeding and spreading back are performed while the vehicle is moving.
  • the apparatus further comprises a compacting device.
  • the compacting device By the compacting device, the treated soil which has been installed back to the ground may be compacted right after the spreading device.
  • the compacting device may be for example a vibrator.
  • the blade device comprises a cutting blade.
  • the blade is configured to scrape a portion of a selected depth off the ground surface by the effect of movement between the vehicle and the ground surface.
  • the blade may thus resemble a plane having a blade to be positioned relative to a body.
  • the apparatus equipped with an unmovable cutting blade is a type of scraper vehicle.
  • the blade device comprises a milling device having a plurality of rotary blades.
  • the blade device may also comprise movable scrapers, chains, cup-like members or corresponding soil-removing projections.
  • the blade device is configured to remove soil to a thickness of 200-1000 mm over the whole working width of the apparatus.
  • the blade device is configured to remove soil over a limited area which is narrower than the whole working width of the apparatus.
  • the apparatus is intended for working a groove along the area travelled by the apparatus.
  • the apparatus may also be configured to form two or more separate longitudinal worked areas over its working width. The depth of such narrower treatment areas from the ground surface may be greater than in the above-mentioned treatment performed over the whole width.
  • the cut may have a depth of 300-1000 mm.
  • the apparatus may also be configured to remove the road ditch soil, to stabilize the ditch soil and to shape it back into a ditch.
  • the blade device is configured to remove soil over the whole working width of the apparatus or an otherwise wide area, but in such a way that the bottom of the area being worked has a desired profile.
  • the shape of the profile may comprise for example a corrugated bottom or it may have a plurality of longitudinal recesses at a distance from each other.
  • the structure may be further reinforced.
  • the mixing device comprises a plurality of movable blades and is configured to crush the removed soil in the loading space.
  • a crushing device of the mixer may break the stones contained in the soil to a smaller size and crush any possible asphalt, which are removed and treated by the apparatus.
  • the mixing device comprises at least one movable or rotatable mixing arm, projection or vane for mixing the soil.
  • the feeding device is arranged in connection with the spreading device, whereby the binder is fed after mixing of the soil.
  • the binder is not fed to the treated soil until right before installing it back onto the ground surface.
  • the spreading device comprises a downwardly sloping inclined plane along which the soil is transferred from the mixer to the ground.
  • the soil may be treated during the time it is transferred along the inclined surface.
  • Above the inclined spreading surface there may be a plurality of nozzles or spreading units from which the binder may be applied to the surface of a layer of soil.
  • the feeding device for feeding the binder is arranged in connection with the loading space.
  • the feeding device is arranged to be part of the mixing device.
  • the binder is mixed into the soil to be treated during the mixing.
  • the feeding device is arranged in connection with the transfer device, whereby it is configured to feed the binder into the removed soil before it reaches the loading space.
  • the feeding device is arranged before the blade device as seen in the travelling direction of the apparatus, whereby the feeding device is configured to treat the soil with the binder right before its removal and transfer for treatment by the apparatus.
  • the feeding device comprises a pressurizing device for pressurizing the binder and at least one nozzle for spraying the pressurized binder to the soil.
  • Said pressurizing device may be a pump. If the binder has a powdery structure, the binder may be fed by means of a powder feeding unit.
  • the apparatus may comprise binder feeding at two or more of the abovementioned feeding sites.
  • the feeding site may be selected in a suitable manner according to the soil treatment to be performed at a given time. Further, it is possible to feed binder simultaneously from two or more feeding sites. When two or more binders are fed to the soil, it is possible to feed these different binders at the same feeding site or at different feeding sites.
  • the apparatus comprises at least one container for the binder.
  • the apparatus is configured to carry the binder to be needed in the treatment onboard the vehicle.
  • the container is a liquid tank for storing a liquid binder.
  • the container is intended for storing a powdery binder.
  • the container is a removable and replaceable unit. Thereby the container may be quickly replaced with a new one after it has become empty or when switching from one binder to another.
  • the apparatus may comprise a replacement mechanism which may comprise a mechanical quick coupling for the container and quick connections to the feeding mechanism.
  • the apparatus is intended for road layer stabilization, wherein soil materials of the load-bearing structure of the road are homogenized and stabilized.
  • the apparatus is intended for stabilizing road repair in which the existing load-bearing structure of the road is treated to improve its strength and bearing capacity.
  • the idea of one embodiment is that the apparatus is sized to the width of a road lane.
  • the apparatus is configured to feed to the soil at least one activator material which together with the soil being treated is configured to form a hardenable geopolymeric or alkali-activatable mixture.
  • the binder to be used is an activator used in the hardening of a geopolymer or an alkali-activated material.
  • the idea of one embodiment is the use of binders and binder mixtures made from side streams and wastes in road construction.
  • the life-cycle costs of pavement structures containing base layers stabilized with such industrial side-stream and waste-based binder mixtures may be significantly lower as compared to pavement structures constructed from natural stone materials.
  • a further advantage of the proposed new solution may be that difficultly treatable side-stream materials may be efficiently and safely processed and utilized at a road and earth construction site.
  • the mass may be prepared at a road construction site in one operation into a ready castable batch and applied to the road pavement structure.
  • the proposed apparatus is also suitable for a stabilization treatment using ashes, such as fly ash and cement or fly ash and lime. Also other ashes formed in biocombustion may be utilized as the binders or stabilization subcomponents.
  • the spreading device comprises a device for feeding the mass into a geotube or a corresponding sleeve structure.
  • the spreading device comprises a device for feeding the mass over or under one or more earth construction films or fabrics, or alternatively between two or more films or fabrics.
  • the apparatus comprises an applicator device by which an insulating material may be arranged to the surface of the abovementioned geotube, sleeve structure, earth construction film or fabric.
  • Said insulating material may be for example paint or paint-like material to be applied with a brush, a roller or by spraying and having a good thermal insulation capacity.
  • the material may comprise for example nanomaterial or nanoparticles.
  • the apparatus comprises a surfacing device by which a wearing surface layer or a corresponding top surface layer may be arranged directly to the surface of the geotube, sleeve structure or the like.
  • the surfacing may be for example asphalt, concrete or geopolymeric material.
  • the surfacing device may lay the surfacing simultaneously with the abovementioned stabilized structural layer.
  • the surfacing device may lay the surfacing over the abovementioned stabilized structural layer immediately after this structural layer has been laid off the apparatus. In both cases the road or other earth construction site being stabilized is completed in a single operation up to the surface layer.
  • the idea of one embodiment is that in addition to the renovation and construction of roads, the proposed solution is also applicable to the stabilization of foundations for streets, fields, yards and buildings and structures.
  • the solution relates to a method of stabilizing soil with a binder.
  • soil is treated with at least one binder to improve its compression strength.
  • the treatment of soil is performed in a movable apparatus. In other words, the stabilization treatment is performed while the apparatus is moving forward in its driving direction.
  • the idea of one embodiment is that the stabilization is performed as one continuous process and is completed in a single operation.
  • the idea of one embodiment is that homogenization and stabilization treatment of the load-bearing structure of the road are performed in the movable apparatus.
  • the soil being treated is in this case road aggregate.
  • the idea of one embodiment is that no new natural stone material is added to the road aggregate or pavement structure in the stabilizing road repair method being performed. Therefore, natural stone materials may be saved and transports reduced.
  • the idea of one embodiment is that only one or more liquid or powdery binders are added to the existing road material in the stabilizing treatment.
  • the idea of one embodiment is that the stabilization of the load-bearing structure of the road is performed in a single operation and using a single apparatus.
  • the idea of one embodiment is that the proposed apparatus and method are also applicable to stabilization of the load-bearing structure of a new road.
  • soil is drawn from the desired road line and it is stabilized while the movable apparatus is moving along the selected road line.
  • the idea of one embodiment is that the proposed apparatus and method are applicable to stabilization of a single-use or temporary road structure or area.
  • a diversion, emergency access road, forest road, loading area, turnaround or the like may be constructed quickly and at a low cost.
  • the idea of one embodiment is that the soil is stabilized to a compression strength of at least 0.1 MPa by means of the proposed apparatus. Thereby the other geotechnical properties of the treated soil are generally improved as well.
  • the idea of one embodiment is that the material being treated is stabilized to a compression strength of 0.1-100 MPa by means of the proposed apparatus.
  • the load-bearing structure of the road is stabilized to a compression strength of at least 4 MPa by using as the binder an activator that forms together with road aggregate a hardenable geopolymeric or alkali-activatable mixture.
  • the idea of one embodiment is that the road aggregate is stabilized to a compression strength of 0.1-100 Mpa.
  • the idea of one embodiment is that the road aggregate is stabilized to a compression strength above 6 Mpa.
  • the idea of one embodiment is that soil is removed by a movable removing device and the removed soil is transferred into a loading space of the movable apparatus; the removed soil is treated by a mixing device of the movable apparatus for its homogenization; at least one binder is fed to the soil; and the removed soil is returned back to ground after the treatment by a spreading device.
  • the soil is circulated in the method through the processing device of the movable apparatus and returned back to the place from where it was taken.
  • base layer stabilization is performed for the road by removing soil of the road in a layer of a predetermined thickness and by treating the removed layer by providing it with only binder to increase the compression strength of the existing soil.
  • composition of the road aggregate is analysed and the binder and dosage of the binder to be used are selected based on the analysis.
  • composition of the soil to be treated is analysed before starting the stabilization of the road.
  • composition of the soil being treated is analysed during the stabilization and binder feeding is adjusted based on the analysis.
  • the idea of one embodiment is that moisture of the soil being treated is determined and if necessary, water is added to the soil being treated to obtain a desired moisture content.
  • the idea of one embodiment is that at least one industrial side-stream material or product prepared from a side-stream material is mixed into the soil in the movable apparatus.
  • the idea of one embodiment is that in addition to the binder, at least one fibre material is mixed into the soil in the movable apparatus.
  • the fibre material may be pulp-based fibre, such as lignin.
  • the fibre material may be recycled textile fibre.
  • textile fibre is mixed into the soil in the movable apparatus as fibre reinforcement.
  • the textile fibre may be recycled fibre, such as modified fibre from cast-off clothes or other textiles.
  • the recycled fibre may also have been prepared from surplus clothes or surplus material of textile industry processes.
  • Textile fibre has been found to be particularly well suited for reinforcing at least foundation structures of which the required lifetime is limited. Such structures include for example various temporary roads, support structures and protective embankments.
  • the idea of one embodiment is that in addition to the binder, waste fibre being produced in the demolition of wind turbines is mixed into the soil in the movable apparatus as fibre reinforcement.
  • the blades and also other structures of wind turbines include reinforced plastic in which the plastic material is reinforced with glass fibres, carbon fibres or the like. Especially the dismantling of the blades produces a large amount of glass-fibre plastic waste which after crushing may be used as such as a filler in a foundation structure. Further, the glass-fibre plastic waste may be processed in such a way that mainly just the fibre material is used as fibre reinforcement in the foundation structure.
  • the wind turbine demolition waste may be used for extension and repair construction of the surroundings of the wind turbine being demolished and of the wind park, whereby the waste need not be transported over long distances.
  • foundations of new wind turbines and service roads may be constructed from the proposed solution.
  • the treatment of the wind turbine blades may comprise crushing by a movable crushing device in the immediate vicinity of the wind turbine being demolished.
  • the movable apparatus according to the solution or the road construction machine may comprise a feeding device for feeding this fibre material having been separated by crushing into the mass.
  • the idea of one embodiment is that in addition to the binder, at least one crushed non-stone material is mixed into the soil in the movable apparatus as a filler, thermal insulation layer and/or drainage layer.
  • the crushed material may be for example crushed tires, crushed concrete, crushed asphalt or crushed foam glass.
  • reinforcement elements which may be for example bar-like or mesh-like objects are mixed into the soil in the movable apparatus.
  • reinforcement elements which may be for example bar-like or mesh-like objects are mixed into the soil in the movable apparatus.
  • reinforcement elements which may be for example bar-like or mesh-like objects are mixed into the soil in the movable apparatus.
  • re-bars or steel wire meshes may be fed to the structure to be stabilized by means of a feeding mechanism in the movable apparatus in order to form steel reinforcement.
  • geosynthetic reinforcements such as bars, profiles or meshes, may be fed to the structure to be formed in the work machine by means of a feeding mechanism.
  • the movable apparatus may thus perform both of the mass stabilization treatment and installation of the reinforcement elements at the same time.
  • the idea of one embodiment is that the stabilization treatment is performed for an edge portion of the road by means of the movable apparatus.
  • the idea of one embodiment is that the road shoulder is stabilized.
  • the idea of one embodiment is that the road ditch at the edge of the road is stabilized and shaped.
  • the counter embankment of the road is stabilized and shaped to support the road structure.
  • an edge portion may be formed from the stabilized mass at the edge of the road to prevent the growth of vegetation close to the road.
  • the stabilized edge portion may also serve as a foundation for installations of the road structure, such as, for example, traffic signs, guide signs, street lights and railings.
  • the idea of one embodiment is that the solution is suitable for renovation and construction of lower-class and gravel roads.
  • the proposed solution may also be used in the renovation and foundation of main roads and other larger roads.
  • a geopolymer may also mean an alkali-activated material.
  • silicon oxide SiO 2 and aluminium oxide Al 2 O 3 have reacted and formed a compression-resistant solid structure.
  • geopolymers are also referred to in literature as a subset of alkali-activated materials.
  • silicon oxide SiO 2 and aluminium oxide Al 2 O 3 have a central role in the formation of so-called geopolymer cement which is a cement-like binder.
  • Geopolymer cement may be utilized in the manufacture of a compression-resistant, concrete-like material.
  • a geopolymer is a cementitious binder which may be utilized for the manufacture of a concrete-like material, and which is produced from a silicon-and aluminium-containing material, for example a side-stream material in alkaline or acidic conditions.
  • a concrete-like strong material produced in a reaction of industrial mineral side-streams and alkaline components is also generally called a geopolymer.
  • Alkaline components such as sodium-based solutions are used as reactive agents in the manufacture.
  • the idea of one embodiment is that the proposed apparatus and method are designed and intended particularly for utilization and use of industrial side-stream materials in layer stabilization.
  • the idea of one embodiment is that in addition to roads and streets, the proposed apparatus, method and the numerous embodiments described above are also applicable to the treatment and improvement of geotechnical properties of the foundation soils for buildings.
  • the idea of one embodiment is that in addition to roads and streets, the proposed apparatus, method and the numerous embodiments described above are also applicable to the treatment of soil foundations of parking spaces, storage spaces, pools, clamps, terminals, sports fields and industrial parks and to the improvement of geotechnical properties of their soils.
  • FIG. 1 is a schematical and simplified diagram presenting different layers of a road structure
  • FIG. 2 is a schematical and simplified diagram presenting a composition of one binder-stabilized structural layer
  • FIG. 3 is a schematical and simplified diagram presenting some additional features and components which may be included in a stabilized structural layer
  • FIG. 4 schematically illustrates a cross-section of one road structure as seen from a longitudinal direction of the road
  • FIG. 5 schematically illustrates a cross-section of one road structure and its edges as seen from a longitudinal direction of the road
  • FIG. 6 schematically illustrates one stabilized structural layer with reinforcements as seen from a longitudinal direction
  • FIGS. 7 and 8 schematically illustrate some apparatuses for stabilizing soil as seen from the side
  • FIG. 9 is a schematical and simplified diagram presenting features of yet one apparatus used for stabilization.
  • FIG. 10 is a schematical and simplified diagram presenting features relating to analysis of soil.
  • a road structure 1 typically comprises a subsoil 2 over which a pavement structure 3 of the road is provided.
  • the pavement structure 3 comprises a plurality of successive layers 3 a which may include a surface layer 4 , a base layer 5 , a sub-base layer 6 and a drainage layer 7 .
  • the structural layers 3 a may be as known per se in structure and properties.
  • One or more of these structural layers may be treated with a hardenable binder to stabilize the structural layer. This is referred to as a so-called layer stabilization.
  • a stabilized structural layer 8 comprises a hardenable binder 9 by which stone material 10 of the structural layer 8 is reinforced.
  • the stone material 10 may be for example sand, gravel, broken stone, crushed material or the like.
  • the stabilized material or mass may further be applied in a space delimited by a sleeve structure 11 .
  • the sleeve structure 11 may be a tubular structure.
  • the stabilized structural layer may be applied over or between one or more filter fabrics or earth construction films.
  • FIG. 3 lists additional features which may be included in the binder-stabilized structural layer.
  • the stabilized mass may comprise a fibre reinforcement 12 and the mass may be foamed 13 .
  • a geopolymer or an alkali-activatable mixture 14 may be used for the stabilization of the stone material.
  • a filler 15 may be mixed in the mass and its strength may be improved by using separate reinforcement elements 16 .
  • the mass may be electricity-conducting 17 and storing.
  • the stabilized mass may be applied between, over or under protective layers 18 , which protective layers may be a tube or a sleeve structure, a filter fabric and various other films and wovens.
  • various inserts 19 such as, for example, technical installations, devices, sensors, cables, anchoring elements and coupling elements may be arranged in the stabilized mass and structure. Thermally insulating material, paste or paint may be applied to the surface of the structure.
  • FIG. 4 illustrates one road structure 1 in which the binder-stabilized structural layer 8 is the base layer 5 over which a levelling layer 20 is further applied.
  • the levelling layer 20 may be a protective layer or a layer that enables shaping of the road surface and protects the stabilized layer 8 .
  • the levelling layer 20 may be crushed material.
  • the stabilized structural layer 8 may be arranged in a space delimited by a sleeve structure 11 .
  • the sleeve structure 11 may protect the structural layer 8 against moisture stress and it may be a type of geotube that participates in shaping the cross-section of the structural layer.
  • FIG. 5 illustrates one road structure 1 having a binder-stabilized structural layer 8 in its pavement structure 3 .
  • the edges of the road structure 1 are also provided with binder-stabilized edge portions 8 c , 8 d .
  • These edge portions 8 c , 8 d may form the embankment or shoulder of the road structure and may thereby speed up the construction of the road and facilitate road maintenance.
  • the edge portions 8 c , 8 d may be provided with a ready ditch profile 21 or ditch beam, technical installations 22 or supports 23 .
  • the technical installations 22 may be for example conductors, measuring devices and fixing elements.
  • the supports 23 may be for example elements intended for supporting and fixing railings, lampposts, traffic signs and the like.
  • edge portions 8 c , 8 d may be provided with integrated or separate extension portions 8 e which also comprise a binder-stabilized structure.
  • the counter embankment of the road structure may be supported and construction of the road speeded up by means of the extension portion. Further, maintenance of the road may be facilitated and safety improved when vegetation at the edges of the road may be prevented.
  • FIG. 6 illustrates a binder-stabilized structural layer 8 having a plurality of longitudinal reinforcement elements 16 arranged to its base P side. Due to bending, the base P side of the structure is subject to tensile stress that is well absorbed by the reinforcements 16 .
  • the reinforcements 16 may have a desired profile and they are fixed to the surrounding hardened mass.
  • FIG. 7 illustrates an apparatus 24 for treating a structural layer of a road structure 1 or any ground soil.
  • the apparatus 24 comprises a movable vehicle 25 having a blade device 26 for removing the soil from the surface of the road structure 1 or ground while the apparatus 24 is being moved in a driving direction A.
  • the blade device 26 may be for example a milling machine.
  • the blade device 26 comprises a cutter plate 26 a which is pushed into the soil while the apparatus 24 is moving and removes the soil by scraping.
  • the soil may be cut for example to a depth of 200-400 mm.
  • the removed soil is transferred into a loading space 28 of the apparatus by a transfer device 27 , which loading space is provided with a mixing device 29 .
  • the mixing device 29 may not only mix the soil but also crush its larger constituents, such as stones.
  • the mixing device 29 may comprise a plurality of movable blades 29 a .
  • the transfer device 27 may be a conveyor or an inclined surface.
  • a feeding device 30 is configured to feed one or more stabilizing materials into the soil.
  • the apparatus 24 may comprise one or more containers 31 for the stabilizing material.
  • the mass may be transferred by means of conveyors 32 and 33 from the loading space 28 to a spreading device 34 which spreads the mass onto the ground surface as a structural layer having a desired layer thickness and width.
  • the mass may be compacted by means of a vibrator V.
  • the binder or binder mixture being used in the stabilization may be fed from a feeding device 30 into the loading space 28 , from a feeding device 30 a to the conveyor 33 or from a feeding device 30 b to the spreading device 30 b.
  • the apparatus 24 may comprise a sensor S 1 and an optical measuring device 35 or a camera. In connection with the loading space 28 there may be a sensor S 2 to identify properties of the mass and the soil. Sensors and measuring devices may also be arranged in connection with the transfer device 27 and the conveyors 32 , 33 .
  • the measurement data are transmitted to a control unit CU of the apparatus 24 . Alternatively or additionally, measurement data may also be transmitted to one or more external control units CU', servers or electronic terminal devices.
  • the apparatus 24 may comprise a feeding device 36 for feeding a film, fabric, geotube or the like together with the stabilized mass. Further, the apparatus 24 may comprise a feeding device 37 for feeding reinforcements or cables onto the ground surface together with the mass.
  • FIG. 8 illustrates another apparatus 24 having a slightly different construction than the scraper vehicle illustrated in FIG. 7 .
  • the main components and the operating principle are the same. The difference is that after mixing, the mass is fed from the loading space between two films 38 a , 38 b .
  • the spreading device 34 comprises film feeding devices 39 a , 39 b and a coupling device 40 for joining the edges of the films to each other.
  • one film is used, the longitudinal edges of which film are guided to the upper surface side of the mass and coupled to each other.
  • the spreading device 34 feeds the tubular structure along the conveyor surface 32 onto the surface of ground.
  • the tubular structure is a geotube or sleeve structure 11 which protects the stabilized structural layer 8 .
  • FIGS. 7 and 8 further introduce a foaming device 41 by which the mass may be foamed to reduce its density.
  • FIG. 9 further lists the features of one apparatus 24 .
  • the apparatus differs from those illustrated in FIGS. 7 and 8 in that the blade device 26 comprises a boom and a bucket.
  • the boom may be movably coupled to the chassis 25 of the apparatus 24 and different buckets may be coupled to its outer end.
  • the blade device 26 may thus be the boom of an excavator.
  • FIG. 10 presents the stages, devices and features relating to analysis of the soil being treated. These aspects have already been described above in this document.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Road Paving Structures (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Processing Of Solid Wastes (AREA)
  • Soil Working Implements (AREA)
US18/004,637 2020-07-09 2021-07-06 Apparatus and method of treating soil Pending US20230250596A1 (en)

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FI20205742A FI20205742A1 (fi) 2020-07-09 2020-07-09 Laite ja menetelmä maa-aineksen käsittelemiseksi
PCT/FI2021/050522 WO2022008798A1 (en) 2020-07-09 2021-07-06 Apparatus and method of treating soil

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AU (1) AU2021303585A1 (zh)
BR (1) BR112023000370A2 (zh)
DK (1) DK4179153T3 (zh)
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US2201493A (en) * 1937-09-04 1940-05-21 Viber Company Apparatus for road building
US4011023A (en) * 1975-12-15 1977-03-08 Cutler Repaving, Inc. Asphalt pavement recycling apparatus
KR920701571A (ko) * 1989-03-16 1992-08-12 에이취. 에이. 제이. 비르 아스팔트도로 표면재생기
FR2743372B1 (fr) * 1996-01-05 1998-02-20 Medinger Jean Claude Dispositif de traitement de sol en porte epaisseur
NO310836B1 (no) * 1998-02-16 2001-09-03 Fjordane Eiendom As V Ingvar O Fremgangsmåte og reasfalteringsmaskin for reasfaltering av et felt av en asfaltert vei
EP2511420A1 (en) * 2011-04-15 2012-10-17 Tony Duffy Engineering, Ltd. Road strengthening and reinforcement during a recycling process

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FI20205742A1 (fi) 2022-01-10
EP4179153A1 (en) 2023-05-17
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DK4179153T3 (da) 2024-04-22
LT4179153T (lt) 2024-05-27
BR112023000370A2 (pt) 2023-03-14
WO2022008798A1 (en) 2022-01-13
AU2021303585A1 (en) 2023-02-09
CN115812118A (zh) 2023-03-17

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