Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
  • B28C7/16—Discharge means, e.g. with intermediate storage of fresh concrete
  • B28C7/162—Discharge means, e.g. with intermediate storage of fresh concrete by means of conveyors, other than those comprising skips or containers, e.g. endless belts, screws, air under pressure
  • B28C7/163—Discharge means, e.g. with intermediate storage of fresh concrete by means of conveyors, other than those comprising skips or containers, e.g. endless belts, screws, air under pressure using a pump
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
  • B28C7/16—Discharge means, e.g. with intermediate storage of fresh concrete
  • B28C7/162—Discharge means, e.g. with intermediate storage of fresh concrete by means of conveyors, other than those comprising skips or containers, e.g. endless belts, screws, air under pressure
  • B28C7/163—Discharge means, e.g. with intermediate storage of fresh concrete by means of conveyors, other than those comprising skips or containers, e.g. endless belts, screws, air under pressure using a pump
  • B28C7/165—Discharge means, e.g. with intermediate storage of fresh concrete by means of conveyors, other than those comprising skips or containers, e.g. endless belts, screws, air under pressure using a pump using a fluid, e.g. gas
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
  • E04F21/00—Implements for finishing work on buildings
  • E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
  • E04F21/06—Implements for applying plaster, insulating material, or the like
  • E04F21/08—Mechanical implements
  • E04F21/085—Mechanical implements for filling building cavity walls with insulating materials
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
  • E04F21/00—Implements for finishing work on buildings
  • E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
  • E04F21/06—Implements for applying plaster, insulating material, or the like
  • E04F21/08—Mechanical implements
  • E04F21/12—Mechanical implements acting by gas pressure, e.g. steam pressure
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
  • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
  • E04G21/04—Devices for both conveying and distributing
  • E04G21/0418—Devices for both conveying and distributing with distribution hose
  • E04G21/0436—Devices for both conveying and distributing with distribution hose on a mobile support, e.g. truck
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
  • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
  • E21D11/04—Lining with building materials
  • E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
  • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
  • E21D11/04—Lining with building materials
  • E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
  • E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete

Definitions

• the invention relates to the field of construction, and more particularly to the thermal and / or acoustic insulation of buildings by projection of lightweight concrete.
• Shotcrete is known for a long time, as evidenced by the French patent FR 578 421 of 1924, which describes a device for spraying concrete by compressed air.
• wet water is added to the mixture of granulate and binder to form the concrete before it is thrown onto the site to be coated.
• dry route water is added to the mixture at the time of projection.
• the wet process has long been used (and still is) for mineral concretes and mortars.
• the concrete dosage is complex, especially because of the difficulty in controlling the flow rate of the dry mixture (especially if the pressure generated by the fan is not adjustable).
• One objective is to propose a method and installation for the projection of lightweight wet insulation concrete which, separately or jointly:
• This wet spraying process makes it possible to maximize the flow rate (and thus the yield) while optimizing the quantity of water and minimizing the dust.
• Various additional features of this process may be provided, alone or in combination:
• the binder is prompt natural cement.
• the concrete contains a water-retaining adjuvant
• the concrete contains a retarding agent
• the pressure prevailing in the lance at the nozzle is less than 0.5 bars, and preferably less than 0.3 bars.
• a light insulation concrete projection system which comprises:
• a spray lance equipped with a barrel, a nozzle to vi turi opening into the barrel and a primary intake manifold opening into the barrel to the right of the venturi;
• At least one primary supply duct connecting the primary outlet orifice of the tank to the intake manifold of the lance.
• the container comprises a return worm mounted in parallel with the worm go and driven in rotation in the opposite direction thereof;
• the tank is provided with a secondary outlet orifice to the right of the worm go, the projection lance is equipped with a secondary intake manifold opening into the barrel, and the system comprises a secondary duct d ' brought connecting the secondary outlet port of the tank to the secondary intake manifold;
• the secondary intake manifold opens to the right of the primary tubing.
• FIG. 1 is a perspective view illustrating an exterior insulation construction site of a building made by means of a light concrete projection system
• FIG. 2 is a detailed view of the site of FIG. 1, on a larger scale
• FIG. 3 is a detail view of the construction site of FIG. 1, on a larger scale;
• FIG. 4 is a view from above of a container equipping the projection system with, in medallions, two details on a larger scale;
• FIG. 5 is a perspective view, partially broken away, of the container of Figure 4;
• FIG. 6 is a partial sectional view of the container of Figure 4, according to the sectional plane VI -VI;
• FIG. 7 is a detail sectional view of the container of Figure 6, according to the plane VI I -VI I;
• FIG. 8 is a perspective view of a spear equipping the projection system, according to a first embodiment
• Figure 9 is a sectional view of the lance of Figure 8, according to the IX sectional plane;
• FIG. 10 is a view of a detail of the lance of FIG. 9, taken in box X;
• FIG. 1 1 is a perspective view of a spear equipping the projection system, according to a second embodiment
• Figure 12 is a sectional view of the lance of Figure 11, according to the section plane XI I;
• FIG. 13 is a view of a detail of the lance of FIG. 12 taken in box XIII.
• Figure 1 an insulation project of a building 1.
• the nature of the building 1 matters little; it is a house of housing but it could be a building, an outbuilding, a garage, a shelter, and so on.
• Building 1 typically comprises masonry 2 (including facade, pigno ns, floors, slabs) with a roof and, in this case, the insulation work consists of covering masonry 2 (eg the gable under the roof). prevailing wind) of a projected layer of light insulating concrete 3, examples of which will be provided below.
• This projection system 4 comprises, in the first place, a container 5 equipped with a tank 6 in which is poured concrete 3 already ready, and at least one endless screw 7 go.
• the tank 6 is provided with at least one primary outlet orifice 8A, arranged in line with the endless screw 7.
• the endless screw 7 is mounted in rotation in the tank 6 to continuously convey the concrete 3 to the primary port 8A.
• the vessel 6 comprises a pair of inclined longitudinal walls 9, connected by two end transverse walls, namely an upstream transverse wall and a downstream transverse wall.
• the tank 6 has an opening 12 through which is poured the beto n 3 and, opposite the opening 12, a bottom 13 shaped gutter.
• the screw 7 comes in the form of a steel Archimedes screw (preferably stainless) comprising a shaft 14 mounted between the transverse walls 10, 11, and a propeller 15 secured to the shaft 14.
• the outer diameter of the helix 15, substantially equal (within a few millimeters clearance) to the internal diameter of the bottom 13 of the tank 6, is between 100 mm and 200 mm, and preferably of the order of 125 mm.
• propeller 15 is between 100 mm and 200 mm, and preferably of the order of 125 mm
• the diameter of the shaft 14 is between 20 mm and 40 mm, and for example of the order of 30 mm .
• the screw 7 going is mounted in rotation with respect to the tank 6 (and more precisely with respect to the transverse walls 10, 11) by means of bearings, preferably with rolling bearings.
• the shaft 14 At an upstream end, the shaft 14 has a section 16 cantilever protruding from the tank 6 and which is secured to a wheel 17 (pulley or toothed wheel).
• the container 5 is equipped with an engine
• the container 5 comprises a mobile carriage 20 provided with a frame 21, on which the tank 6 and the engine 18 are mounted, and a The chassis 21 is advantageously equipped with a caravan-type attachment 23, so that the container 5 can be towed to be transported on the site by a vehicle equipped with a trailer. a suitable coupling.
• the concrete 3 is introduced already prepared (and therefore wet) in the tank 6.
• the concrete 3 can be prepared by hand but, according to a preferred embodiment, the projection system 4 comprises In effect, a kneader 24 into which the ingredients are poured and which prepares the concrete 3 therefrom.
• the mixer 24 is vertical axis; it comprises a frame 25, a tank 26 mounted on the frame 25, a rotor 27 provided with blades 28, and a motor 29 coupled to the rotor 27 to drive the latter in rotation about the axis so as to mix the ingredients so as to obtain a homogeneous concrete.
• the kneader 24 may be mounted on a utility vehicle, e.g. a flatbed truck.
• the container 5 is placed directly above the kneader 24, which is advantageously equipped with a hatch and a hopper 31 through which, at the opening of the hatch, the wet kneaded concrete 3 is poured into the the tank 6 of the tale neur 5.
• the ingredients of the concrete 3 comprise at least one vegetable granulate, a binder and water.
• the granulate is eg. the density (for the dry chenevotte) is of the order of 100 kg / m 3 in unneeded time (ie not packed)
• the binder is, for example, natural cement prompt.
• binder (prompt natural cement): 39,5%
• the set retarder is e.g. citric acid, typically food grade.
• the quantity is minute compared to those of the main components (aggregate, binder, water); customary recommendations recommending 80 g of citric acid for a 25 kg bag of natural quick-release cement (equivalent to 320 g per 100 kg of natural prompt cement). Such an amount is sufficient to delay at least half an hour the setting of the concrete, regardless of the composition chosen from the three revealed above.
• a cohesive agent intended to maintain the consistency of the concrete during the projection.
• This cohesive agent can also act as a water retaining adjunct, intended to improve the stability and homogeneity of the concrete.
• Methyl cellulose is particularly indicated because it fulfills these two functions. The quantity added to the mixture is minute compared to that of the main components.
• the amount of cohesion agent / water retainer has the advantage of being proportional to the weight of granulate.
• a quantity of water retention (in particular methylcellulose) of 2% by weight ie 2 kg per 100 kg or 1000 I of chenevotte gives good results, and this the proportions of binder and water.
• the following method of preparation of the concrete 3 can be used, which proves to be excellent.
• the chènevotte is first introduced into the kneader 24 dry and the methylcellulose, dosed at 2% by weight of the chènevotte is added thereto.
• the kneader is then allowed to rotate for a few seconds so that the methylcellulose coats the chenevot and then II of water is added per kg of hemp.
• the binder (including the prompt) is then introduced and then 0.51 parts of water are added per kg of binder.
• the tank 6 of the container 5 is provided with at least one primary outlet orifice 8A e, positioned to the right of the screw 7 go. More precisely, the primary opening 8A opens into or near the bottom 13.
• the primary orifice 8A may be formed by a bore made in the tank 6 (possibly directly in the bottom) or, as in the example illustrated, by a tube 32 attached, integral with a longitudinal wall 9 (being attached to this, for example, by welding).
• This tube 32 preferably has an internal diameter of 50 mm.
• the primary orifice 8A is preferably positioned in the vicinity of the downstream transverse wall, at a short distance from it.
• the screw 7 go has a step to the right; in this case, it is rotated by the motor 18 in the counterclockwise direction so as to route the poured concrete 3 to the primary orifice 8A.
• the shaft 14 of the screw 7 has a downstream end section 33 devoid of a helix (the propeller 15 stops slightly downstream of the orifice 8A prim aire) but provided with a device 34 breaker clods, here under fo rme a series of blades 35 cyli nd riqu es.
• This device 34 is intended to disintegrate the concrete 3 which accumulates around the downstream end section 33.
• the tank 6 is preferably provided with a secondary exit orifice 8B, also arranged in line with the screw 7 without end going.
• the secondary orifice 8 B opens into or near the bottom 13, at the right of the primary orifice 8A.
• the secondary orifice 8B may be formed by an attached tube fixed to a longitudinal wall or, as in the example illustrated, directly into the bottom 13 of the tank 6.
• the secondary orifice 8B is advantageously extended by an added pipe 37, welded to the tank 6. This tubing 37 preferably has an internal diameter of 50 mm.
• the container 5 is equipped with a screw 38 without end end, mounted in parallel with the endless screw 7 and driven in rotation in the opposite direction thereof.
• the 38 screw return may be of identical design to the screw 7 go, and includes as it a shaft 14 and a propeller 15.
• the screw 38 return is however mounted head to tail relative to the screw 7 go, as can be seen in the figure 4.
• the screw 38 retou r overhangs the screw 7 go, being slightly shifted transversely thereto.
• the propeller 14 of the return screw 38 extends from the downstream transverse wall 11 of the tank 6 to a short distance from the upstream transverse wall, and has in the vicinity of the latter a device 34 which is a breakwater of design. identical to that of the screw 7 go.
• the drive of the 38 return screw can be made using the motor
• the concrete 3 which has not been evacuated through the orifice 8A (or the orifices 8A, 8B) of output is disaggregated by the device 34 breaker of the screw 7 going and forwarded downstream in upstream by the screw 38 return. Having reached the vicinity of the upstream transverse wall, the concrete 3 thus rerouted is again broken up by the device 34 breaker of the screw 38 return and then falls back into the bottom 13 before being again conveyed from upstream to downstream by the screw 7 go, to be discharged through the orifice 8A (or the orifices 8A, 8B) output. This recirculation of the concrete 3 is performed until it has been evacuated in full.
• the system 4 of projection also comprises:
• a spray lance 40 equipped with a barrel 41, a venturi nozzle 42 (hereinafter more simply referred to as a venturi) opening into the barrel 41 and at least one primary intake manifold 43A opening into the barrel 41 to the right of the venturi 42;
• a venturi nozzle 42 hereinafter more simply referred to as a venturi
• a source 44 of compressed air connected to the venturi 42;
• At least one primary supply line 45A connecting the primary outlet orifice 8A of the tank 6 to the primary inlet tubing 43A of the lance 40.
• the (or each) supply duct 45A is advantageously in the form of a flexible tube, optionally reinforced with a spiral wire, and preferably having a smooth inner wall and an external diameter equal (with the clearance) to internal diameter of the tube 32 forming the primary orifice 8A (respectively of the tubing 38 prolo ngeant the secondary orifice 8B) - or about 50 mm in the example illustrated
• the reinforcing wire is metallized, so as to conduct electricity. This wire then eliminates the phenomena of static electricity generated by the friction of the flow of material against the inner wall of the conduit 45A supply.
• the source 44 of compressed air is advantageously in the form of a compressor.
• This compressor 44 is for example mounted on a sleigh 46 provided with a wheel train 47 and a fastener 48 caravan type, so that the compressor 44 can be towed to be transported to the site by a vehicle equipped with a suitable hitch.
• the compressor 44 is connected to the venturi 42 by means of a rubber hose 49 or any other pressure-resistant elastomer.
• the lance 40 is equipped with a coupling 50 on which the hose 49 is sealingly connected.
• the lance 40 is advantageously equipped, in addition, with a valve 51 interposed between the connection 50 and the venturi 42.
• This valve 51 is for example of the quarter-turn type and comprises a spherical plug 52 that rotatably integral with a handle 53 whose operation places the plug 52 in an open position (illustrated in FIGS. 10 and 13) in which the plug 52 passes air coming from the compressor 44, or a closing position (not shown) in which the bushel 52 closes the passage of air.
• the lance 40 has a duct 54 connecting the connection 50 to the barrel 41; the venturi 42 is in the form of a constriction made in this duct 54 on the side of the barrel 41. More precisely, the venturi 42 comprises a narrowed sectio n (that is to say of smaller diameter than that of the conduit 54 downstream of the plug 52], followed by a flared section 56 through which the venturi 42 opens into the barrel 41, which has a diameter much greater than that of the duct 54, and in particular that of the narrowed section 55.
• the duct 54 has a mean diameter D 1 of between 12 mm and 20 mm, and, for example, of 14 mm, the section 55 narrows a diameter D 2 of between 5 mm and 15mm, and eg of the order of 10mm, the section 56 flared (taken at the widest) a diameter D3 of the order of 20mm, and the barrel 41 an internal diameter D4 of 50 mm.
• the depressurization is preferably greater than 0.7 bar (ie that is, the pressure is less than 0.3 bar].
• This depression is transmitted via the primary intake pipe 43A and the primary supply conduit 45A, to the primary outlet orifice 8A through which the concrete 3 in circulation is then sucked.
• the tank 6 comprises two outlet orifices 8A, 8B, namely a primary orifice 8A and a secondary orifice 8B
• the lance 40 of projectio n is in this case equipped with a tubular 43 B secondary intake opening into the barrel 41
• the system 3 comprises a secondary conduit 45B supply connecting the secondary outlet port 8B to the secondary tubing 43 B intake.
• the depression in the barrel 41 is transmitted via the secondary intake pipe 43 B and the secondary supply conduit 45B to the secondary outlet orifice 8B through which the circulating concrete 3 is then sucked.
• the or each supply duct 45A, 45B is provided with one (or more) notch (s) 57 which protrudes (s) from the tube 32 (respectively from the tubing 37] and extends (ent) to the outlet orifice 8A (respectively 8B) .
• This (these) recess 57 (a) have the function of avoiding the obstruction of the orifice 8A (respectively 8B) of output by promoting the circulation of air under the effect of the depression generated by the venturi 42, and thus to facilitate the suction of concrete circulating in the tank 6.
• each supply duct 45A, 45B is provided with three notches 57 distributed at 120 °
• each notch 57 is through in the 45A, 45B duct wall, and the duct 45A, 45B is fitted on a tube 58 which extends from the orifice 8A, 8B respective j than beyond the Notch 57.
• each notch 57 is hollowed in the thickness of the conduit 45A, 45B without piercing it.
• the lance 40 comprises a primary intake manifold 43A and a secondary superimposed intake manifold 43B, which open all two in the barrel 41 via a collector 59 preferably inclined at an angle A of about 45 ° relative to the barrel 41.
• the barrel 41 has a main section 60 of constant diameter D4 (that is to say of about 50 mm in the illustrated example), and preferably an end section 61 of larger diameter (this diameter, denoted D 5, is advantageously between 60 and 90 mm, and for example about 70 mm) intended to reduce the flow rate of the concrete 3 to minimize rebounds against the surface to be coated, while forming a flare and which increases the area covered by the proj ection.
• the lance 40 comprises a primary inlet tubing 43A and a secondary inlet tubing 43B that are symmetrical with respect to the barrel 41, into which they both open. directly at the venturi 42, preferably with an angle B (about 45 ° in the example shown).
• This section 62 of lesser diameter includes a straight portion 63, the length of which is between 150 mm and 300 mm (and for example about 200 mm), and a bent portion 64 which extends the right portion 63 and forms with this angle C advantageously between 30 ° and 50 °, and e.g. about 45 °.
• the straight portion 63 may be formed by fitting a small diameter tube (between 30 and 50 mm, and for example about 40 mm) into a larger diameter outer end tube (eg 50 mm). mm) with interposition of an airtight filling product 65, such as a closed-cell polymer foam.
• the smaller diameter section 62 opens into a large diameter section 66 (this diameter, denoted D 7, is advantageously greater than 90 mm, and for example about 120 mm) intended to reduce the flow rate of the concrete 3 to minimize rebounds on the surface to be coated, while forming a flared jet that increases the area covered by projection.
• the large-diameter section 66 partly overlaps the smaller-diameter section 62, and has an angled external portion 67 which is connected thereto upstream of its mouth, so to create around the portion 64 angled u do decompression chamber 68 intended to generate turbulence in the concrete flow to slow it down, favoring its projection into small clods rather than clods, and its homogeneous distribution on the surface to be coated.
• a large-diameter end section 61 may be added to the barrel 41, this end section 61 allowing, by pressure losses, to slow down the flow of concrete, thus reducing the risk of the material rebounding on the surface to coated.
• a first phase consists in preparing the concrete 3 by mixing, in predetermined proportions (see above), the natural fibrous granulate (here the chenevotte), the binder (in this case the beneficial cement) and the water, optionally supplemented with the set retarder. (Such as citric acid) and the water-retaining adjuvant (such as methylcellulose) This mixture can be made by hand but it is advantageously carried out by means of the mixer 24.
• a second phase consists in pouring wet concrete 3 thus prepared (visible in gray in FIG. 2) into the container 5, and more precisely in the tank 6 which has been started up. (or the) screw 7, 38 endlessly.
• the hatch is opened. The concrete 3 flows into the tank 6 through the hopper 3 1.
• a third phase consists of continuously circulating the wet concrete 3 in the tank 6 to the right of the orifice 8A (or outlets 8A, 8B). This circulation is achieved by means of the screw 7 (or vi s 7, 38), driven (s) co njointly (and in opposite directions) in rotation by the engine 18.
• the device (s) 34 breaker disintegrates (s) any agglomerates that form in the vicinity of the downstream end wall 11 (respectively of the upstream end wall).
• a fourth phase consists in sucking the wet concrete 3 along the conduit 45A (or conduits 45A, 45B) supplying connecting the orifice 8A (respectively the orifices 8A, 8B) outlet tank 6 to the lance 40 of projection, by means of the venturi 42 supplied with compressed air by the compressor 44, and to project on the support 2, by means of the lance 40, wet concrete 3 and sucked.
• the indentations 57 formed in the duct 45A (or ducts 45A, 45B) supply facilitates the flow of air (as illustrated by the arrows on the detail medallions of Figure 6) and avoid the obstruction of the 8A orifice (or openings 8A, 8B) output by the concrete 3.
• the concrete 3 is sucked into the conduit 45A (or ducts 45A, 45B) of supply by small clumps (a few cubic millimeters to a few cubic centimeters) which thus obstruct neither the conduit 45A (or the ducts 45A, 45B) nor the lance 40 and are projected on the surface to be coated at a speed which, as suggested above, can be adjusted by varying the diameter of the barrel 41.
• the architecture of the projectio n system 1 makes it possible to obtain a proj ection rate greater than 2 m 3 / h, and can even reach 3 m 3 / h.
• a wall 2 having a length of 10 m and a height of 3.3 m of a layer of lightweight concrete insulation of a thickness of 15 cm (an approximate volume of 5 m 3 )
• two and three hours of projection are sufficient. If the worker 69 is alone on the site, he must also count the preparation time of the concrete 3 (eg in successive increments of 100 l), unless the concrete 3 is prepared continuously, by ex. by a second worker dedicated to this task, in which case the preparation time of the concrete 3 is masked.
• guides 70 typically in the form of planks
• the worker 69 can smooth the projected concrete 3 by means of a mason's rule. If it is still moist enough, the scraped concrete can be recycled by being reintroduced into the container 5.
• the fact of being able to project the concrete 3 wet makes it possible to optimize the quantity of water consumed, the water dosage of the concrete 3 being less than that of a concrete intended to be implemented by hand.
• the concrete 3 since the concrete 3 is projected in a wet way, it does not generate any dust in its projection, unlike the concretes projected in the dry process. Some dust can be emitted when the granulate and the cement are introduced into the mixer 24, which can be contained by means of a lid or a cloth coming from covering the tank 26.
• system 4 can be used to project concrete in the dry process, the venturi 42 being able to suck granulate alone which can be added with binder and wetted at the outlet of the lance 10.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• Civil Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Dispersion Chemistry (AREA)
• Chemical & Material Sciences (AREA)
• Geology (AREA)
• Geochemistry & Mineralogy (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
• On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
• Nozzles (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

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• 2015
  • 2015-06-30 FR FR1501393A patent/FR3038331B1/fr active Active
• 2016
  • 2016-06-29 US US15/738,323 patent/US11040463B2/en active Active
  • 2016-06-29 EP EP16757684.2A patent/EP3317059B1/de active Active
  • 2016-06-29 WO PCT/FR2016/000109 patent/WO2017001734A1/fr not_active Ceased

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