METHOD AND SYSTEM FOR PRODUCE MOLDED BODY FROM A HYDRAULICALLY BOUND MIXTURE

Description

[0001] The invention relates to a method for producing shaped bodies from a hydraulically setting mixture and to a system for producing shaped bodies from a hydraulically setting mixture.

[0002] There are already various approaches for the production of shaped bodies from hydraulically setting mixtures, in particular from concrete or mortar compositions.

[0003] Traditionally, formwork is used to produce molded bodies from hydraulically setting mixtures. A formwork is positioned at a predefined location, the hydraulically setting mixture is poured into this formwork, and then the process is allowed to set and become dimensionally stable. The formwork can then be removed, and the same process repeated at an adjacent location. However, this type of process has the disadvantage that a considerable amount of time is required for the mixture to set. Furthermore, positioning and dismantling the formwork is a significant effort. Furthermore, the shape of the molded body cannot be freely selected because the formwork has a standardized shape, as it must be reused multiple times.

[0004] To avoid such disadvantages, systems have been proposed that do not require such formwork. For example, WO 2019 / 202156 A1 discloses a method for producing a component from curable material, in which individual layers of the curable material are placed on top of one another, and in which reinforcing elements are continued from layer to layer and enclosed in the construction material. On the one hand, this method does not require the formwork described above, but on the other hand, it has the disadvantage that the layer-by-layer construction process is very difficult to control. In particular, the setting of the construction material must be adjusted very precisely so that the layers harden quickly enough after application, and on the other hand so that the construction material is sufficiently fluid or extrudable to be processed in an applicator.A device for carrying out such a process is therefore structurally very complex and cost-intensive.

[0005] Another example of a previously known solution is described in EP 3 431 172 A, which discloses a method and a system for producing molded bodies from a hydraulically setting mixture according to the preamble of claim 1 and claim 6, respectively. Here, a building material, in particular concrete or mortar, is printed using a layer-by-layer construction. In particular, two layers can be printed simultaneously on both sides of a reinforcement layer. However, this method also has the disadvantage that it places very high demands on the system, as the building material and its curing behavior must be very precisely controlled and adjusted.

[0006] The objective is therefore to provide a process or system for producing molded articles that does not have the aforementioned disadvantages. In particular, the process or system should enable a more cost-effective design or process that is also more robust and less susceptible to parameter changes.

[0007] This object is initially achieved by a process for producing shaped bodies from a hydraulically setting mixture according to claim 1.

[0008] This solution has the primary advantage that no formwork is required, thus avoiding long waiting times during the construction process. Furthermore, the use of grid structures instead of formwork ensures greater design freedom. Grid structures can be chosen relatively freely in terms of shape, as they are not reused, as is the case with formwork. The grid structures also reinforce the finished molded body.

[0009] Furthermore, the process proposed here has the advantage that the requirements for the hydraulically settable mixture are lower than those for printer-like processes. Thanks to the lattice structures, the hydraulically settable mixture does not have to set immediately after application, but rather has a support that holds the mixture in shape for the initial period after application. This allows for more robust and cost-effective systems than would be the case with printer-like processes. Furthermore, the flow rate of the construction material during the production process is less limited than with printer-like processes.

[0010] A further advantage is that the use of lattice structures allows for reinforcement within the building material. With printer-like processes, such reinforcement must be added separately and is often less easily integrated into the molded body.

[0011] To achieve the object mentioned above, a system for producing shaped bodies from a hydraulically setting mixture according to claim 6 is also proposed.

[0012] Such a system has the advantage of providing a system that can efficiently build molded bodies using relatively simple and mobile means. Because the size of the lattice structures can be freely selected, large machines are not necessarily required. Thus, the system structure can be adapted to the specific requirements of the construction process for such molded bodies.

[0013] Furthermore, such a system enables the creation of a fully mobile structure. For example, the grid structures can be provided and positioned by a mobile unit, the hydraulically setting mix can also be provided and applied by a mobile unit, and the application unit for applying the shotcrete can also be implemented as a small mobile unit. This allows for a high degree of flexibility, allowing a wide range of applications for the production of such molded bodies to be covered.

[0014] A "hydraulically setting mixture" is a mixture containing a hydraulic binder which, in the presence of water, reacts in a hydration reaction to form solid hydrates or hydrate phases.

[0015] Preferably, the mixture also contains aggregates, water and optionally additives.

[0016] The hydraulic binder can be selected from mineral and / or organic binders. For example, the binder includes cement, lime, hydraulic lime, or gypsum, either alone, as a mixture of several of the aforementioned binders, or in admixture with latently hydraulic binders and / or pozzolans. Aggregates are present, in particular, in the form of sand, gravel, and / or aggregates. Organic binders can be, for example, epoxy- or polyurethane-based binders.

[0017] According to the invention, the hydraulically setting mixture is a concrete composition or a mortar composition.

[0018] An "admixture" is, in particular, a substance capable of modifying the physical and / or chemical properties of the hydraulically setting mixture. It is preferably a setting accelerator, hardening accelerator, and / or thickener (stabilizer).

[0019] A "flow-influencing element" is understood here to mean a body that protrudes into the cavity and influences the flow of the hydraulically settable mixture flowing through the cavity. This influence can take place, in particular, in the form of an at least partial change in the flow direction of the mixture and / or an at least partial separation of the mixture into partial flows.

[0020] The addition "static" means that the flow-influencing element is immovably attached to the device and is not moved while the hydraulically setting mixture is being passed through.

[0021] According to the invention, the additive comprises a setting accelerator.

[0022] The advantage of adding such a setting accelerator is that the hydraulically setting mixture can initially be stored or kept ready without the setting accelerator. After the setting accelerator is added, the setting properties are modified, allowing the hydraulically setting mixture to set more quickly after it has been applied to the lattice structure. This allows for a more efficient manufacturing process for the molded bodies and also ensures that the hydraulically setting mixture does not flow out through the meshes of the lattice structure.

[0023] According to the invention, the hydraulically setting mixture is a concrete composition or a mortar composition.

[0024] In an exemplary further development, the concrete composition has a cement content of 350 to 500 kg / m3, preferably 380 to 470 kg / m3, particularly preferably 400 to 450 kg / m3.

[0025] In an exemplary further development, the concrete composition has an aggregate with a maximum grain size of 20 mm, preferably 15 mm, particularly preferably 10 mm.

[0026] In an exemplary further development, the concrete composition has a water-cement ratio of less than 0.60, preferably less than 0.55, particularly preferably less than 0.50.

[0027] In an exemplary embodiment, the admixture is added during filling when the hydraulically setting mixture is prepared. In particular, the admixture is added in a concrete plant or in a truck mixer.

[0028] In an exemplary further development with such an admixture of the additive, the additive is a thickener (stabilizer).

[0029] According to the invention, during filling, the hydraulically setting mixture is conveyed through a line, whereby the additive is mixed into the hydraulically setting mixture on a section of this line.

[0030] The advantage of introducing the additive into a section of the pipeline is that it allows a property of the settable mixture to be changed shortly before its application. This allows a property to be determined for storage or handling.

[0031] The properties selected for the preparation of the mixture may be different from those selected for the preparation after its application.

[0032] According to the invention, this section comprises a tubular cavity for passing the hydraulically settable mixture along a predetermined flow direction, wherein a static flow-influencing element projects into the cavity, at which an opening leading into the cavity is present for introducing the additive.

[0033] The provision of such a flow-influencing element in this section has the advantage that mixing of the additive with the hydraulically settable mixture can be greatly improved by generating turbulence in a flow path of the mixture thanks to the static flow-influencing element.

[0034] In an exemplary embodiment, at least two, in particular at least three, particularly preferably at least four, flow-influencing elements spaced apart from one another in the longitudinal direction of the cavity are present on this section, wherein preferably the at least two flow-influencing elements protrude into the cavity from different radial directions.

[0035] By providing several such flow-influencing elements, it is ensured that the most complete mixing possible of the additive with the hydraulically setting mixture can be achieved.

[0036] The tubular cavity for conveying the hydraulically setting mixture is preferably shaped like a circular cylinder. However, other shapes are also possible. For example, the tubular cavity can also have a non-circular or non-round cross-section.

[0037] Particularly preferably, in the area of ​​the flow-influencing element, on an outer side of the section, there is a fluid inlet communicating with the opening for introducing the additive, through which the additive can be supplied. This allows the section to be directly connected to a conveying device for the additive.

[0038] According to another embodiment, however, it is also possible to provide the fluid inlet in another area and to lead it to the flow-influencing element via a fluid line.

[0039] The opening leading into the cavity is preferably designed such that the additive can be introduced into the cavity at a distance from a wall of the cavity. In particular, the distance between the wall and the opening is 25-70%, especially 35-50%, of the diameter of the tubular cavity.

[0040] This allows the additive to be introduced directly into the inner area of ​​the hydraulically setting mixture, which leads to particularly effective mixing.

[0041] In particular, the opening leading into the cavity is designed such that the additive can be introduced into the cavity in a direction substantially along the longitudinal axis of the tubular cavity or at an angle thereto. In particular, the additive is introduced in a direction that has an angle of 0-45°, in particular 15-30°, to the longitudinal axis of the cavity. Thus, the additive can be added in the direction of flow or slightly obliquely thereto, which has proven advantageous with regard to achieving the fastest possible homogeneous distribution.

[0042] The opening leading into the cavity is preferably designed such that the additive can be introduced into the cavity on a downstream side of the flow-influencing element. In other words, the opening leading into the cavity is preferably located on the downstream side of the flow-influencing element. This prevents the hydraulically settable mixture from being forced into the opening during passage, and at the same time, the pressure required to convey the additive can be minimized.

[0043] However, it is also possible to arrange the opening leading into the cavity to the side of the flow-influencing element and / or in an upstream area.

[0044] If required, several openings can also be arranged in different areas of the flow-influencing element.

[0045] According to a particularly advantageous embodiment, the flow-influencing element is designed as a cylindrical nozzle, the longitudinal axis of which projects into the cavity in a direction substantially perpendicular to the longitudinal axis of the cavity or in the radial direction of the cavity. In particular, the opening leading into the cavity is located on the end face and / or the lateral surface of the cylindrical nozzle. An arrangement in a downstream region of the lateral surface is particularly preferred.

[0046] According to a further advantageous embodiment, the flow-influencing element is designed such that it projects continuously and increasingly further into the cavity along its length running in the longitudinal direction of the cavity, in particular in the flow direction.

[0047] In particular, the flow-influencing element has a leading edge that runs from the upstream end to the downstream end into the cavity at an angle to the flow direction. This has proven particularly advantageous in terms of mixing effect. Furthermore, it significantly reduces the risk of clogging.

[0048] According to a particularly preferred embodiment, the flow-influencing element is designed as a fin, in particular a triangular fin. A "fin" is understood, in particular, to be a flat element that has a small thickness compared to its length and height. The thickness is preferably at most 25% of the length or width.

[0049] The fin preferably has a leading edge and an opposite trailing edge which are connected via two side surfaces, in particular two triangular side surfaces.

[0050] The fin is preferably triangular. Such fins can, for example, be in the shape of a flat right-angled triangle. One or more corners can be rounded and / or one or more edges can be curved.

[0051] A triangular fin is in particular arranged in such a way that one of its tips protrudes into the cavity while a side of the fin opposite the tip is arranged on the wall of the cavity.

[0052] In principle, fins of a different shape can also be used.

[0053] The fin is preferably aligned along the cavity wall's longitudinal axis or has an acute angle of 0-15°, particularly 1-10°, relative to the cavity's longitudinal axis. This allows the fin to locally divide the hydraulically settable mixture as it flows through. At the same time, the risk of clogging in the fin area is greatly reduced.

[0054] According to a particularly preferred embodiment, the fin is inclined to a longitudinal axis of the cavity, so that the side surfaces of the fin are inclined to the longitudinal axis of the cavity. The inclination is preferably 0-15°, in particular 1-10°. This can further improve the mixing effect.

[0055] Furthermore, it has proven advantageous if the fin is curved, in particular such that the first side surface is designed as a concave surface and the second side surface is designed as a convex side surface.

[0056] The leading edge of the fin preferably has an angle of 20 - 60° to the longitudinal axis of the cavity and / or the trailing edge has an angle of 80 - 90° to the longitudinal axis of the cavity.

[0057] The opening for introducing the additive is preferably located at the rear edge of the fin.

[0058] A cross-sectional area in the cavity of the section, without taking into account the flow-influencing element(s), is preferably 100-1,500 cm2, in particular 500-1,200 cm2, especially 600-800 cm2 or approximately 706 cm2. A diameter of the cavity at its widest point is preferably 50-300 mm, in particular 80-250 mm, especially 120-180 mm or 150 mm.

[0059] Preferably, the section has connecting elements on the upstream side and / or on the downstream side. The connecting elements are preferably designed for connection to pipelines and / or for connecting multiple sections to one another. The connecting elements can be in the form of, for example, flanges, clamps, and / or elements of screw connections.

[0060] According to an advantageous embodiment, there are at least two, in particular at least three, particularly preferably at least four, flow-influencing elements spaced apart from one another in the longitudinal direction of the cavity. Each of the flow-influencing elements is preferably a fin, in particular a triangular fin, specifically an inclined and / or curved fin, as described above.

[0061] The mixing effect can be significantly increased by connecting several flow-influencing elements in series.

[0062] The at least two flow-influencing elements preferably protrude into the cavity from different radial directions.

[0063] The radial directions of the at least two flow-influencing elements preferably form an angle of 360° / (number of flow-influencing elements) with each other. For two flow-influencing elements, the angle is in particular 180°, for three flow-influencing elements, 120°, and for four flow-influencing elements, 90°.

[0064] In particular, the section comprises at least two, in particular at least three, preferably at least four, detachably connectable individual sections as described above. The sections are designed such that, in the connected state, they communicate with each other via their tubular cavities.

[0065] In an exemplary embodiment, a further pipe section is arranged on the downstream side and / or on the upstream side of the section, wherein this further pipe section has, at least in one region, a free inner cross-section which is smaller than the inner cross-section of the cavity of the section.

[0066] Preferably, the free internal cross-section in the further pipe section at the narrowest point is smaller by a factor of 0.2-0.8, in particular 0.3-0.5, compared to the cross-sectional area in the cavity of the section, without taking into account the flow-influencing element(s). A diameter of the further pipe section at the narrowest point is preferably smaller by a factor of 0.4-0.9, in particular 0.5-0.7, compared to the cross-sectional area in the cavity of the section.

[0067] A cross-sectional area in the further pipe section at the narrowest point is preferably 100-600 cm2, in particular 200-400 cm2, especially 300-350 cm2 or approximately 314 cm2. A diameter of the further pipe section at the narrowest point is preferably 30-300 mm, in particular 50-200 mm, especially 80-120 mm or 100 mm.

[0068] Preferably, a further pipe section is connected to the downstream side, tapering in the direction of flow with respect to the free internal cross-section. In particular, the free internal cross-section in the further pipe section is conically tapered.

[0069] It has been shown that by combining the section with the tapered further pipe section, the mixing effect can be further increased, so that a more homogeneous distribution of the additive is achieved more quickly or within a shorter distance.

[0070] Preferably, the free internal cross-section in the tapered further pipe section is reduced by a factor of 0.2 - 0.8, especially 0.3 - 0.5, especially over a length of 0.25 - 2 m, preferably 0.5 - 1.5 m. This allows for additional mixing of the additive and also minimizes the risk of blockages.

[0071] Furthermore, it is preferred if, at the same time, a second pipe section is connected to the upstream side, tapering in relation to the internal cross-section opposite to the flow direction, wherein the second pipe section preferably tapers in a step-like manner. With regard to cross-section and diameter, the second pipe section is preferably dimensioned as described above.

[0072] This limits the volume flow entering the section, so that the risk of blockages in the area of ​​the flow-influencing elements can be reduced.

[0073] When spraying over the outside of the grid structure, shotcrete is used.

[0074] In an exemplary further development, the shotcrete has a cement content of 360 to 510 kg / m3, preferably 400 to 470 kg / m3, particularly preferably 420 to 450 kg / m3.

[0075] In an exemplary further development, the shotcrete has an aggregate with a maximum grain size of 8 mm, preferably 6 mm, particularly preferably 4 mm.

[0076] In an exemplary further development, the concrete composition has a water-cement ratio of less than 0.60, preferably less than 0.55, particularly preferably less than 0.50.

[0077] In an exemplary embodiment, the grid structure comprises two interconnected grid mats.

[0078] In an exemplary embodiment, the two grid mats are connected to each other in such a way that they run substantially parallel to each other.

[0079] In an exemplary embodiment, the grid mats are substantially planar or substantially wave-shaped or substantially uneven.

[0080] In an exemplary embodiment, a distance between the two grid mats is between 5 and 100 cm, preferably between 10 and 80 cm, particularly preferably between 15 and 50 cm.

[0081] In an exemplary embodiment, the bars of the grid mats are aligned substantially horizontally and vertically, with the bars forming a grid.

[0082] In an alternative embodiment, the bars of the grid mats are aligned substantially diagonally to a horizontal and a vertical direction, wherein the bars form a grid.

[0083] In an exemplary embodiment, when providing the lattice structure, a plurality of prefabricated lattice structures are provided, wherein the method comprises an additional step: connecting the plurality of lattice structures to one another; wherein the plurality of lattice structures are filled and overmolded.

[0084] Such provision of multiple lattice structures has the advantage that greater freedom for shaping the molded body can be achieved by adding individual lattice structures as desired.

[0085] In addition, the provision of prefabricated lattice structures has the advantage that no robots are required to manufacture the lattice structures, so that the entire process can be carried out by smaller and more mobile units.

[0086] In an alternative embodiment, when providing the grid structure, the grid structure is created at a filling location, in particular by a robot.

[0087] This alternative process, however, offers the advantage that the grid structures do not have to be prefabricated and therefore do not have to be transported to a filling location.

[0088] In an exemplary embodiment, when filling the grid structure, the hydraulically setting mixture is introduced into an area between the two grid mats of the grid structure.

[0089] The hydraulically setting mixture can be introduced between the grid mats, for example, from above or from one side.

[0090] In an alternative embodiment, when filling the grid structure, the hydraulically setting mixture is introduced through a grid of a grid mat of the grid structure.

[0091] In an exemplary further development, a retaining element is arranged on a grid mat opposite the filling location of the hydraulically setting mixture during the filling process, so that the hydraulically setting mixture introduced laterally into the grid structure is prevented from escaping from the grid structure on an opposite side.

[0092] During filling, filling between the mesh mats can be combined with filling through the mesh of a mesh mat. In particular, the filling location can be changed during the filling process.

[0093] According to the invention, the conveying unit comprises a line for the hydraulically setting mixture, wherein the additive is mixed into the hydraulically setting mixture on a section of this line.

[0094] According to the invention, a section of this line comprises a tubular cavity for passing the hydraulically settable mixture along a predetermined flow direction, wherein a static flow-influencing element projects into the cavity, at which an opening leading into the cavity is present for introducing the additive.

[0095] In an exemplary embodiment, the system further comprises a positioning unit that can arrange the grid structure at a filling location at which the conveying unit can apply the hydraulically settable mixture into the grid structure.

[0096] In an exemplary further development, the positioning unit includes a crane.

[0097] In an exemplary further development, the positioning unit also comprises a loading area for the storage and / or transport of lattice structures.

[0098] In an exemplary further development, the positioning unit is designed specifically as a truck.

[0099] In an exemplary embodiment, the conveying unit comprises a tank for the hydraulically settable mixture and a line.

[0100] In an exemplary embodiment, the line is guided by a movable arm, in particular by a crane-like arm.

[0101] In an exemplary embodiment, the conveying device is designed as a tanker truck or as a truck.

[0102] In an exemplary embodiment, the application unit comprises a mobile pumping and tank device.

[0103] In an exemplary embodiment, the application unit also comprises a movable line.

[0104] In an exemplary further development, the movable line is designed as a flexible hose, which is designed to be movable in particular by an application technician.

[0105] Various exemplary embodiments are listed below to further illustrate the described invention. Naturally, the invention is not limited to these described exemplary embodiments. The following drawings illustrate the exemplary embodiments, which show: Fig. 1 shows an exemplary system for producing molded bodies from a hydraulically settable mixture; Figs. 2a to 2c show a schematic and exemplary representation of a method for producing molded bodies from a hydraulically settable mixture; and Figs. 3a and 3b show a schematic and exemplary representation of a section of a line on which an additive can be added to the hydraulically settable mixture.

[0106] In Fig. 1 A system 1 for producing molded bodies 8 from a hydraulically settable mixture is shown schematically and by way of example. In this exemplary embodiment, the system 1 comprises a plurality of grid structures 4, which can be arranged by a positioning unit 5 at a location for filling with the hydraulically settable mixture. In this exemplary embodiment, the positioning unit 5 is designed as a truck with a crane superstructure.

[0107] The system 1 further comprises a conveying unit 2 for applying the settable mixture. The conveying unit 2 comprises a tank and a crane arm 7 for positioning the line 6. This allows the hydraulically settable mixture to be conveyed from the tank via the line 6 into the grid structures 4.

[0108] The system 1 also includes an application unit 3 for applying shotcrete. In this exemplary embodiment, the application unit 3 is designed as a compact, mobile unit that can be operated by an application technician. The application technician can direct a spray head of the application unit 3 to a desired location.

[0109] In this embodiment, several lattice structures 4 are connected to each other at the filling location, filled, and overmolded with the hydraulically settable mixture. This allows a molded body 8 of any size to be constructed.

[0110] In the Fig. 2a bis 2c A process for producing shaped bodies 8 from a hydraulically setting mixture 9 is shown schematically and by way of example.

[0111] In Fig. 2a It can be seen that a grid structure 4 is initially provided. This figure also shows the line 6 and a crane arm 7 for positioning the line 6, which are then used for the filling process of the grid structure.

[0112] In Fig. 2b The filling of the grid structure 4 with the hydraulically setting mixture 9 is now schematically shown. In this embodiment, the line 6 is positioned above the grid structure 4 so that the hydraulically setting mixture 9 can be introduced between the grid mats of the grid structure 4.

[0113] In Fig. 2c The spraying of the outer surfaces of the grid structure 4 with a shotcrete 10 is then shown schematically and by way of example. The shotcrete 10 is applied by an application technician to the outer surface of the grid structure 4, which is filled with the hydraulically setting mixture 9. This ultimately creates the molded body 8.

[0114] Fig. 3a shows a schematic representation of an arrangement with a section 100 for admixing the additive into the hydraulically settable mixture 9. A flow-influencing element 150 is arranged in section 100, and a fluid inlet 140 is located near this flow-influencing element 150. In this illustration, the opening for injecting the additive into section 100 is not visible.

[0115] Connected to the downstream end 110 of section 100 is a pipe section 200 that tapers conically with respect to the free internal cross-section in the flow direction 133. Pipe section 200 has a length of 1 m, for example. In the region of its upstream end, the internal diameter of pipe section 200 corresponds to the diameter 132 of the cavity 130 of device 100 of approximately 150 mm, while the internal diameter of the pipe section in the narrowest region, or in the region of its downstream end, is approximately 100 mm.

[0116] Furthermore, a second pipe section 300 is connected to the upstream end 120 of the device 100, which tapers in a stepwise manner counter to the flow direction 133. In the region of its end connected to the device 100, the inner diameter of the pipe section 300 corresponds to the diameter 132 of the cavity 130 of the device 100 of approximately 150 mm, while the inner diameter of the pipe section 300 in the tapered region or in the region of its upstream end is approximately 100 mm.

[0117] In Fig. 3bSection 100 is shown schematically and by way of example. In this exemplary embodiment, section 100 is in the form of a circular-cylindrical pipe section with a circular-cylindrical cavity 130 through which a hydraulically settable mixture can be passed along a longitudinal axis corresponding to the intended flow direction 133. A first annular mounting flange is located at the downstream end 110, while a second annular mounting flange is located at the upstream end 120. Section 100 can be connected to other tubular elements via the flanges.

[0118] A triangular and curved fin 150 projects from the inner wall of the section 100 into the cavity 130 as a flow-influencing element. At the downstream trailing edge 150c of the fin 150, an opening 160 leading into the cavity 130 is arranged for introducing an additive.

[0119] The additive can be guided from the outside to the opening 160 via a fluid inlet 140 in the region of the fin 150 and a fluid channel passing through the fin 150. List of reference symbols

[0120] 1System 2Conveying unit 3Application unit 4Grid structure 5Positioning unit 6Pipe 7Crane arm 8Form body 9Hydraulic settable mixture 10Shotcrete 100Pipe section 110Downstream end 120Upstream end 130Cavity 133Flow direction 140Fluid inlet 150Flow-influencing element 150CDownstream trailing edge 160Opening 200Downstream section 300Upstream section

Claims

1. A method for producing molded bodies (8) from a hydraulically settable mixture (9), the method comprising the steps of: - Providing at least a mesh structure (4); - Filling the mesh structure (4) with a hydraulically settable mixture (9), to which an admixture is added prior to filling, the admixture comprising a setting accelerator, the hydraulically settable mixture (9) being a concrete composition or a mortar composition, whereby during filling the hydraulically settable mixture (9) is conveyed through a conduit (6), wherein the admixture is admixed with the hydraulically settable mixture (9) at a section (100) of said conduit, and wherein said section (100) comprises a tubular cavity (130) for conducting the hydraulically settable mixture (9) along an intended flow direction (133); - and overspraying the outside of the mesh structure (4) with a sprayed concrete (10); characterized in that a static flow-influencing element (150) projects into the cavity (130), on which there is an opening (160) leading into the cavity (130) for the introduction of the admixture.

2. A method according to claim 1, wherein at least two, in particular at least three, particularly preferably at least four, flow-influencing elements (150) spaced apart from one another in the longitudinal direction of the cavity (130) are present on this section (100), wherein preferably the at least two flow-influencing elements (150) project into the cavity (130) from different radial directions.

3. A method according to any of the preceding claims, wherein the mesh structure (4) comprises two interconnected mesh mats.

4. A method according to any of the preceding claims, wherein in providing the mesh structure (4), a plurality of prefabricated mesh structures (4) are provided, the method comprising an additional step of: connecting the plurality of mesh structures (4) to one another; wherein the plurality of mesh structures (4) are filled and oversprayed.

5. A method according to one of the preceding claims, wherein, when filling the mesh structure (4), the hydraulically settable mixture (9) is introduced through a mesh of a mesh mat of the mesh structure (4).

6. System (1) for producing molded bodies (8) from a hydraulically settable mixture (9), the system (1) comprising: - at least a mesh structure (4); - a supply unit (2) for applying the hydraulically settable mixture (9), which contains an admixture, the supply unit (2) comprising a conduit (6) for the hydraulically settable mixture (9), the admixture being admixed to the hydraulically settable mixture (9) in a section (100) of this conduit ( 6) and wherein the section (100) of this conduit (6) comprises a tubular cavity (130) for conducting the hydraulically settable mixture (9) along an intended flow direction (133); - and an application unit (3) for applying sprayed concrete (10); characterized in that a static flow-influencing element (150) projects into the cavity (130), on which there is an opening (160) leading into the cavity (130) for introducing the admixture.

7. System (1) according to claim 6, wherein the system (1) further comprises a positioning unit (5) which can arrange the mesh structure (4) at a filling location at which the supply unit (2) can apply the hydraulically settable mixture (9) into the mesh structure (4).

8. System (1) according to claim 7, wherein the positioning unit (5) comprises a crane and optionally a loading area for the storage and / or transportation of mesh structures (4), and wherein the positioning unit (5) is designed in particular as a truck.

9. A system (1) according to one of claims 6 to 8, wherein the supply unit (2) comprises a tank for the hydraulically settable mixture (9) and a conduit (6), in particular a conduit (6) guided by a movable arm (7).

10. System (1) according to one of claims 6 to 9, wherein the application unit (3) comprises a mobile pumping and refuelling device and / or a movable line.