3D-printed concrete recyclable formwork and method of making

Abstract

The application discloses a 3D printing concrete recyclable formwork and a manufacturing method thereof, and belongs to the field of building construction. The recyclable formwork comprises a formwork module, the formwork module can be divided into multiple modules, the multiple modules are assembled into a closed formwork module, a reinforcing bar body is arranged in each module, a positioning assembly one is arranged on the reinforcing bar body in a certain module, a positioning assembly two is arranged on the reinforcing bar body in an adjacent module, the positioning assembly one and the positioning assembly two are distributed at different heights, the projections on the horizontal plane are in a clamping and embedding cooperation and have a gap therebetween, and the formwork module can be cut along the cooperation gap after printing, so that the formwork module is divided into multiple modules. Compared with the 3D printing used in a permanent formwork, the formwork manufacturing method enhances the use efficiency of the formwork, plays the advantages of the 3D printing technology on the special-shaped structure, and solves the problem that a traditional formwork material is difficult to manufacture in a special-shaped wall.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and more specifically, to a 3D-printed reusable concrete formwork and its manufacturing method. Background Technology

[0002] 3D printing is a rapid prototyping additive manufacturing technology. This technology allows for the construction of personalized architectural styles through the deposition of materials. Currently, due to technological limitations, 3D-printed concrete formwork is mostly used for permanent formwork, where a closed formwork is 3D printed and then concrete is poured inside to form a single structural component. This does not fully utilize the personalized construction advantages of 3D printing technology. Furthermore, current 3D-printed formwork is closed, making it difficult to disassemble and reuse. The lack of reinforcement during the printing process also makes the formwork susceptible to tensile damage during handling and grouting, further limiting its reusability.

[0003] A search revealed that application CN116834147A discloses a non-removable 3D-printed concrete formwork, comprising a 3D-printed layer and several reinforcing layers. The 3D-printed layer encloses a casting cavity with an opening, and the reinforcing layers are spaced apart along the height of the 3D-printed layer. This design improves the bending and shear resistance of the formwork by adding reinforcing layers, but the formwork still cannot be disassembled and reused. Application CN116752790A discloses a 3D-printed concrete reinforcing formwork. Adjacent formwork units are assembled through a seamlessly fitting combination structure. Reinforcing bars are implanted on the surface of the structure to be reinforced, and a reinforcing mesh is erected. Formwork units are spliced ​​at the location of the structure to be reinforced to form a reinforcing formwork. A cavity layer is left between the reinforcing formwork and the location of the structure to be reinforced, and ultra-high performance concrete is poured into the cavity layer to form a bonding reinforcing layer. This design can install reinforcing bars to achieve reinforcement, but it is also difficult to reuse. Summary of the Invention

[0004] 1. The technical problem that the invention aims to solve

[0005] In view of the difficulty in achieving reuse and recycling of 3D printed concrete formwork in the prior art, this invention aims to provide a reusable 3D printed concrete formwork and its manufacturing method. By using the manufacturing method of this invention, the formwork can be disassembled and reused by reasonably reinforcing the inside of the concrete formwork, while effectively ensuring the strength of the formwork and meeting the requirements for repeated use.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0008] This invention discloses a 3D-printed reusable concrete template, comprising a template module that can be divided into multiple modules, which are then assembled to form a closed template module. Each module contains a reinforcing steel body. A positioning component one is provided on the reinforcing steel body of one module, and a positioning component two is provided on the reinforcing steel body of an adjacent module. The reinforcing steel bodies in different modules are distributed in a layered, staggered manner along the height direction, corresponding to the positioning components one and two being distributed at different heights. The projections of positioning components one and two on the horizontal plane are interlocked and have a gap between them, allowing the template module to be cut along the gap between positioning components one and two after printing, thus dividing the template module into multiple modules.

[0009] Furthermore, the positioning component one has a positioning groove, and the positioning component two has a corresponding positioning protrusion that can be adapted to the positioning groove; the positioning groove and the positioning protrusion are distributed at different heights, and their horizontal projections can be fitted together; there is a sufficient gap between the outer wall of the positioning protrusion and the inner wall of the positioning groove for cutting.

[0010] At least one side of the positioning groove is provided with an outer positioning part 1 that can extend beyond the template module, and at least one side of the corresponding positioning protrusion is provided with an outer positioning part 2 that can extend beyond the template module. The outer positioning part 1 and the outer positioning part 2 can be distributed on the same side of the template module and are arranged vertically to mark the mating position between the positioning groove and the positioning protrusion.

[0011] Furthermore, the main body of the reinforcing steel is provided with multiple sets of guide rings that can extend to the outside of the template module along the length direction. When multiple template modules are assembled in sequence along the height direction, the guide rings on different template modules are kept vertically aligned. The external connecting steel bars are inserted into the guide rings in sequence along the longitudinal direction to connect the multiple template modules.

[0012] Furthermore, multiple sets of positioning clips are spaced along the length of the main steel bar. The extension length of the positioning clips can cover the printing width of the template module, and both ends of the positioning clips have downwardly extending snap-fit ​​parts, which cover the inner and outer sides of the printing width of the template module.

[0013] Furthermore, the main body of the reinforcing bar is provided with multiple sets of outer extensions at intervals along the length direction. The outer extensions extend toward the outer wall of the template module, and the guide ring is fixed at the outer end of the outer extension.

[0014] Furthermore, both ends of the main body of the steel bar are provided with a turning part that intersects with the extension direction of the main body of the steel bar. The end of the turning part is provided with a positioning component one or a positioning component two. The turning part is provided with an outer extension part two that extends toward the outer wall of the template module. The outer end of the outer extension part two is provided with a guide ring.

[0015] This invention also provides a method for manufacturing the aforementioned 3D-printed reusable concrete formwork, comprising:

[0016] S1. Complete the 3D printing of the bottom outline, place the steel bar body on one side of the bottom outline of the template, continue printing to a certain height, and then place the steel bar body on the other side of the template. Repeat this process until the printing height meets the design height to form the template module.

[0017] S2. Cut the template module by cutting from top to bottom along the interlocking gaps between the main steel bars on different sides of the template module, forming multiple modules.

[0018] Furthermore, it also includes: S3, assembling multiple modules into a closed template module, vertically stacking multiple assembled template modules in sequence, and connecting them on the outside of the multiple template modules using external connecting steel bars to assemble an overall template.

[0019] Furthermore, in step S1, a rotatable print head is used, and a guide rod is provided behind the print head along the print path. The guide rod extends longitudinally and its bottom end extends to below the print head, so that a reserved groove is formed on the template surface after the print head prints, and the main body of the steel bar is placed accordingly along the formed reserved groove.

[0020] Furthermore, in step S1, multiple sets of guide rings extending to the outside of the module are provided at intervals along the length extension direction on the main body of the reinforcing steel, and the guide rings on the multi-layer reinforcing steel on the same side of the template are kept vertically corresponding; in step S3, after multiple assembled template modules are stacked in sequence, the external connecting steel bars are inserted longitudinally into the multiple vertically corresponding guide rings in sequence, thereby connecting the multiple template modules.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0023] (1) The 3D printed concrete reusable template of the present invention adopts the form of alternating layering of steel reinforcement on different sides to achieve reasonable internal reinforcement, ensure the strength and stability of the template. At the same time, the steel reinforcement on different sides has a snap-fit ​​structure and a fit gap is reserved at the snap-fit ​​position for cutting. Thus, after the closed template module is printed, it can be cut and divided into multiple independent modules. When in use, multiple modules can be reassembled into a closed template module to meet the requirements of disassembly and reuse, realize the reusability of 3D printed template, reduce the production cost of complex shaped templates, and improve the efficiency of template use.

[0024] (2) The 3D printed concrete reusable template of the present invention has a positioning component one and a positioning component two on the main body of the steel reinforcement. The snap-fit ​​design can not only realize the positioning of the cutting position, but also further strengthen the cross section of the cutting position of the template module. Furthermore, the positioning component one and the positioning component two are embedded in the printed concrete as part of the main body of the steel reinforcement, which further enhances the connection between the entire main body of the steel reinforcement and the concrete.

[0025] (3) The 3D printed concrete reusable template of the present invention has multiple sets of guide rings on the main body of the steel reinforcement that can extend to the outside of the template module. The guide rings on different template modules are aligned vertically. Multiple template modules can be connected by inserting external connecting steel bars into the guide rings in the longitudinal direction to form a stable force system, ensuring the overall stability of the template when it is poured in the cavity.

[0026] (4) The method for manufacturing the 3D printed reusable concrete template of the present invention uses a rotatable print head and a guide rod is provided behind the print head along the print path, so that the print head forms a reserved groove on the template surface after printing, which serves as a positioning mark line for the laying position of the main steel reinforcement. The main steel reinforcement is placed in the corresponding reserved groove, which effectively improves the accuracy of the laying position of the main steel reinforcement. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the printhead structure used in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the main steel reinforcement structure laid in module one of the embodiments of the present invention;

[0029] Figure 3 for Figure 2 A schematic diagram of the structure of the positioning component 1;

[0030] Figure 4 This is a schematic diagram of the main structure of the steel reinforcement laid in module two in an embodiment of the present invention;

[0031] Figure 5 for Figure 4 A schematic diagram of the structure of the second positioning component;

[0032] Figure 6 This is a schematic diagram of the positioning clip structure in an embodiment of the present invention;

[0033] Figure 7 This is a flowchart illustrating the module manufacturing process of the reusable template in this embodiment of the invention.

[0034] Figure 8 This is a schematic diagram of the two modules separated after the template module is cut in an embodiment of the present invention;

[0035] Figure 9 This is a flowchart illustrating the stacking of modules and the connection of the overall template in an embodiment of the present invention.

[0036] Explanation of the labels in the diagram:

[0037] 100. Print head; 101. Guide rod;

[0038] 200. Main steel reinforcement; 201. Outer extension part one; 202. Guide ring; 203. Positioning clip; 204. Turning part; 205. Outer extension part two; 206. Engraving part;

[0039] 210. Positioning component one; 211. Positioning groove; 212. External positioning part one;

[0040] 220. Positioning component two; 221. Positioning protrusion; 222. External positioning part two;

[0041] 300, bottom formwork section; 400, formwork module; 410, module one; 411, module groove; 420, module two; 421, module protrusion; 500, external connecting steel bars. Detailed Implementation

[0042] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] The present invention will be further described below with reference to embodiments.

[0045] Example

[0046] Combination Figures 1-9As shown, the 3D printed concrete reusable template of this embodiment includes a template module 400, which can be divided into multiple modules. The multiple modules are assembled together to form a closed template module 400, and the interior of the template module 400 forms a cavity for pouring. Each module is filled with a steel reinforcement body 200. A positioning component 210 is provided on the steel reinforcement body 200 in a certain module, and a positioning component 220 is provided on the steel reinforcement body 200 in the adjacent module. The steel reinforcement bodies 200 in different modules are distributed in layers and staggered in the height direction, corresponding to the positioning components 210 and 220 being distributed at different heights. The projections of the positioning components 210 and 220 on the horizontal plane are interlocked and have gaps between them, so that after the template module 400 is printed, it can be cut along the interlocking gaps between the positioning components 210 and 220 to divide the template module 400 into multiple modules.

[0047] In practice, 3D printed templates are generally printed using concrete. Due to the characteristics of concrete, if a single-sided template structure is printed, the concrete will show obvious soft collapse and deformation after a certain height, which cannot guarantee sufficient structural strength and stability. Therefore, 3D printing is currently generally used to print closed templates in the industry. However, closed printing paths not only make it difficult to reasonably reinforce the template, but also make it difficult to disassemble and reuse the template due to its closed structure.

[0048] In this embodiment, steel reinforcement bodies 200 are laid layer by layer on different sides of the template module 400. Within the same height, only one side of the template module 400 is covered with steel reinforcement bodies 200. That is, a single steel reinforcement body 200 is only set along a portion of the printing path, not covering the entire printing path. Instead, the horizontal projections of adjacent steel reinforcement bodies 200 on different sides of the upper and lower layers cooperate to form a closed printing path. This ensures that laying steel reinforcement bodies 200 on one side does not affect the printing path, while simultaneously providing comprehensive reinforcement throughout the template module 400, guaranteeing structural strength and stability. Furthermore, positioning components are provided between the steel reinforcement bodies 200 on different sides for interlocking engagement. This interlocking engagement does not mean that positioning component 1 210 and positioning component 220 can directly interlock at the same height, but rather that positioning component 1 210 and positioning component 220 are located at different heights, but... In the horizontal projection relationship, the positioning components 210 and 220 maintain a nested relationship, and their interlocking relationship maintains sufficient clearance for the cutter to cut downwards. Thus, when the template module 400 is printed to the designed height, multiple layers of reinforcing steel bodies 200 are laid inside. On the same side, there can be single or multiple layers of reinforcing steel bodies 200. When multiple layers of reinforcing steel bodies 200 are present on the same side, their vertical positions remain consistent. At this time, a cutting path is formed between the reinforcing steel bodies 200 on different sides, allowing the cutter to pass from top to bottom. The shape of the cutter is consistent with the contour shape of the interlocking clearance between the reinforcing steel bodies 200, and it can divide the entire printing thickness of the template module 400. After cutting, the closed template module 400 can be divided into multiple independent modules. When in use, these multiple modules can be reassembled into a closed template module 400, meeting the requirement of detachable and reusable design. This embodiment not only solves the problem of difficult reinforcement in printed templates but also realizes the reusability of 3D printed templates, reduces the production cost of complex-shaped templates, and improves the efficiency of template use.

[0049] In some embodiments, the positioning component 210 has a positioning groove 211, and the positioning component 220 has a corresponding positioning protrusion 221 that can be adapted to the positioning groove 211; the positioning groove 211 and the positioning protrusion 221 are distributed at different heights, and their horizontal projections can fit together; there is a sufficient clearance for cutting between the outer wall of the positioning protrusion 221 and the inner wall of the positioning groove 211; for example, when combined with Figures 2 to 5 As shown, the positioning groove 211 can be a U-shaped groove, and the corresponding positioning protrusion 221 can be an n-shaped protrusion. The horizontal projections of the two form an interlocking state with a U-shaped gap, which allows a cutter of suitable shape and size to cut vertically along the gap path. In practice, other interlocking structures can also be used, as long as they can be used to make cuts.

[0050] In practice, the snap-fit ​​design of positioning component 1 210 and positioning component 2 220 not only enables the positioning of the cutting position, allowing the cutting to proceed in a preset direction, but also serves as a marking position for the printing template module 400, achieving a numbering function. Secondly, the cross-section of the cutting position of the template module 400 is the surface that is repeatedly disassembled and reassembled, making this part more susceptible to wear and damage. Positioning component 1 210 and positioning component 2 220 can further reinforce this disassembly and assembly position. In addition, during the printing process, positioning component 1 210 and positioning component 2 220 are simultaneously embedded into the printed concrete as part of the main steel reinforcement 200, further enhancing the connection between the entire main steel reinforcement 200 and the concrete. The corresponding upper and lower fit of positioning component 1 210 and positioning component 2 220 also improves the stability of the template module 400 during vertical stacking.

[0051] To ensure precise cutting, more preferably, at least one side of the positioning groove 211 is provided with an outer positioning part 212 that extends beyond the template module 400, and at least one side of the corresponding positioning protrusion 221 is provided with an outer positioning part 222 that extends beyond the template module 400. The outer positioning part 212 and the outer positioning part 222 are distributed on the same side of the template module 400 and are arranged vertically to mark the mating position between the positioning groove 211 and the positioning protrusion 221. (For example, in combination...) Figure 3 and Figure 5 As shown, in practice, an outer positioning part 1 212 can be provided on both sides of the opening end of the positioning groove 211, and an outer positioning part 222 can be provided on both sides of the positioning protrusion 221. Both the outer positioning part 1 212 and the outer positioning part 222 can be made of thin iron / steel sheet. In the horizontal projection of the positioning groove 211 and the positioning protrusion 221, the positioning protrusion 221 is embedded in the positioning groove 211. Correspondingly, in the horizontal projection of the outer positioning part 222 and the outer positioning part 1 212, the outer positioning part 222 and the outer positioning part 1 212 extend parallel to each other and have a certain distance between them. The gap also helps the operator determine the cutting position of the cutter, so that the cutter can accurately cut along the mating gap between the positioning groove 211 and the positioning protrusion 221; and the outer positioning part one 212 and the outer positioning part two 222 both extend beyond the edge wall of the template module 400. The operator can intuitively know the cutting position of the cutter by observing the outer positioning part one 212 and the outer positioning part two 222, which improves the cutting accuracy. The outer positioning part one 212 and the outer positioning part two 222 can also further strengthen the connection with the concrete.

[0052] Furthermore, in some embodiments, combining Figure 2 and Figure 4 As shown, the main steel bar 200 is provided with multiple sets of guide rings 202 at intervals along its length, which can extend to the outside of the formwork module 400. Figure 9As shown, when multiple template modules 400 are assembled sequentially along the height direction, the guide rings 202 on different template modules 400 maintain vertical correspondence in the height direction. The external connecting steel bars 500 are inserted into the guide rings 202 sequentially along the longitudinal direction to connect the multiple template modules 400. The guide rings 202 are integral ring structures with a hole diameter larger than the diameter of the external connecting steel bars 500, so that the external connecting steel bars 500 can be flexibly inserted or pulled out directly. In the practical application of reusable 3D printed templates, in addition to considering horizontal reinforcement, longitudinal reinforcement is also required to form a stable force-bearing system among multiple template modules 400. Furthermore, the longitudinal reinforcement must be designed for modular assembly and disassembly. In this embodiment, the guide rings 202 ensure that each template module 400 has a fixed point for external connecting steel bars 500. Multiple guide rings 202, distributed vertically and horizontally, are used in conjunction with the insertion of external connecting steel bars 500, which surround the circumferential wall of the template module 400. This allows for the distribution of multiple sets of external connecting steel bars 500 on the outer side, forming a stable force-bearing system. This ensures the overall stability of the template during casting within the cavity, enabling reuse. The external connecting steel bars 500 can also be removed during transport of each template module 400, making it very convenient.

[0053] To further improve the consistency of the laying position of the main 200mm steel reinforcement, in some embodiments, combined with Figure 6 As shown, the preferred steel reinforcement body 200 is provided with multiple sets of positioning clips 203 spaced apart along its length. The extension length of the positioning clips 203 can cover the printing width of the template module 400, and both ends of the positioning clips 203 have downwardly extending snap-fit ​​portions 206, which cover the inner and outer sides of the printing width of the template module 400. Specifically, the snap-fit ​​portions 206 at both ends of the positioning clips 203 can be symmetrically distributed on both sides of the axial direction of the steel reinforcement body 200. The positioning clips 203 are used to further verify the accuracy of the placement position of the steel reinforcement body 200, ensuring that the upper and lower layers of steel reinforcement bodies 200 on the same side remain consistent.

[0054] In practice, it is preferred to combine certain embodiments with Figure 2 and Figure 4 As shown, the main body of the reinforcing steel bar 200 is provided with multiple sets of outer extensions 201 at intervals along its length. The outer extensions 201 extend toward the outer wall of the template module 400, and the guide rings 202 are fixed to the outer ends of the outer extensions 201. The outer extensions 201 are not only used to install the guide rings 202, but also to further strengthen the connection between the main body of the reinforcing steel bar 200 and the concrete, thereby improving the stability of subsequent applications.

[0055] In practice, taking the rectangular frame template module 400 as an example, combined with... Figure 7As shown, the template module 400 can be cut into module one 410 and module two 420 with U-shaped openings; each of module one 410 and module two 420 is equipped with multiple layers of steel reinforcement bodies 200, and the steel reinforcement bodies 200 in module one 410 can be set as follows: Figure 2 and Figure 3 As shown, both ends of the main steel bar 200 along its length are provided with turning portions 204 that intersect the extension direction of the main steel bar 200. Adapting to the rectangular frame form of the template module 400, the turning portions 204 can be perpendicularly distributed to the ends of the main steel bar 200. The ends of the turning portions 204 are provided with positioning components 210 having positioning grooves 211. The main steel bar 200 in module two 420 is configured as follows... Figure 4 and Figure 5 As shown, both ends of the main steel bar 200 along its length are provided with turning portions 204 perpendicular to the extension direction of the main steel bar 200. The end of each turning portion 204 is provided with a positioning component 220 having a positioning protrusion 221. When modules 1 410 and 2 420 are assembled, the horizontal projections of the main steel bar 200 within the two modules correspond to form a rectangular frame, consistent with the printing path. Furthermore, each main steel bar 200 has an outer extension portion 201 on its outer side for fixing the guide ring 202. The outer side of each turning portion 204 also has an outer extension portion 205 extending towards the outer wall of the template module 400, with a guide ring 202 at its outer end. (Reference) Figure 7 As shown, following the alternating layering of the main steel reinforcement 200 on both sides, after the complete template module 400 is printed, a cutter is used to cut it from top to bottom along the mating gap formed between positioning component 1 210 and positioning component 220 to form independent modules 1 410 and 2 420. Figure 8 As shown, a module groove 411 with the same shape as the positioning component 210 is formed on the cut surface of module 1 410, and a module protrusion 421 with the same shape as the positioning component 220 is formed on the cut surface of module 2 420. When the two are reassembled, the module groove 411 and the module protrusion 421 are used for positioning and engagement.

[0056] In practice, depending on the shape and design of the template module 400 according to actual needs, the template module 400 can be cut into multiple modules of no less than two pieces according to the above-mentioned reinforcement laying method. The steel reinforcement main body 200 between different modules is laid in layers alternately, and the cutting is achieved by using a snap-fit ​​method. In practice, this method has high flexibility and meets the requirements of personalized design of 3D printing shapes.

[0057] This embodiment also provides a method for manufacturing the aforementioned 3D-printed reusable concrete formwork, for reference. Figure 7 and Figure 9 ,include:

[0058] S1. Complete the 3D printing of the bottom outline, that is, first print the bottom template part 300, place the steel bar body 200 on one side of the top surface of the bottom template part 300, continue printing to a certain height, and then place the steel bar body 200 on the other side of the template. Repeat this until the printing height meets the design height to form the template module 400.

[0059] S2. Cut the template module 400. Cut from top to bottom along the interlocking gap between the main steel bars 200 on different sides of the template module 400. After cutting, multiple modules are formed. For example, the template module 400 of the rectangular frame can be cut into module one 410 and module two 420.

[0060] When multiple sets of template modules 400 are required for use, the process further includes: S3, assembling multiple modules to form a closed template module 400, vertically stacking multiple assembled template modules 400 sequentially, and connecting the multiple template modules 400 on the outside using external connecting steel bars 500 to assemble an integral template. For example, taking a rectangular frame template module 400 as an example, the cut modules 410 and 420 are reassembled, and similarly, multiple template modules 400 are stacked sequentially and connected using external connecting steel bars 500.

[0061] Furthermore, to improve the accuracy of the laying position of the main steel bar 200, in some embodiments, it is preferable that: in step S1, a rotatable print head 100 is used, such as... Figure 1 As shown, a guide rod 101 is provided behind the print head 100 along the print path. The guide rod 101 extends longitudinally and its bottom end extends below the print head 100, so that a reserved groove is formed on the template surface after the print head 100 prints. The main body of the reinforcing bar 200 is placed accordingly along the formed reserved groove. In practice, it can be further optimized to ensure that the guide rod 101 is in the center of the print path, thereby forming a reserved groove in the center of the print path. The diameter of the guide rod 101 can be the same as the diameter of the main body of the reinforcing bar 200. The distance by which the bottom end of the guide rod 101 extends downward beyond the extrusion nozzle of the print head 100 is the same as the radius of the main body of the reinforcing bar 200. The bottom end of the guide rod 101 is smoothed so that the formed reserved groove can adapt to the size and shape of the main body of the reinforcing bar 200. The operator can directly lay the main body of the reinforcing bar 200 in the reserved groove and press it to fix it. Similarly, multiple sets of positioning clips 203 can be provided at intervals on the main body of the steel bar 200. The extension length of the positioning clips 203 is consistent with the printing thickness of the template module 400. The placement position of the main body of the steel bar 200 can be further verified by using the snap-fit ​​parts 206 at both ends.

[0062] Similar to the template module 400 design in the above embodiment, in step S1, multiple sets of guide rings 202 extending to the outside of the module are provided at intervals along the length extension direction on the main steel bar body 200, and the guide rings 202 on the multi-layer main steel bar body 200 located on the same side of the template are kept vertically corresponding; in step S3, after multiple assembled template modules 400 are stacked in sequence, the external connecting steel bars 500 are inserted longitudinally into the multiple vertically corresponding guide rings 202, thereby connecting the multiple template modules 400.

[0063] In practice, during construction, the length design of the outer extension 201 and the guide ring 202 must ensure that the guide ring 202 is tightly attached to the outer wall of the template module 400, so that the outer connecting steel bar 500 can be tightly attached to the outer wall of the template module 400 after installation. Positioning component 1 210 and positioning component 2 220 can both adopt thin steel sheet structures to ensure their effective embedding into the template module 400. The dimensions of positioning component 1 210 and positioning component 2 220 must ensure that the pre-reserved fitting gap after the snap-fit ​​is greater than the thickness of the cutting blade, meeting the cutting requirements. After cutting out module 1 410 and module 2 420, uneven areas formed at the cutting location can be treated by material reduction to eliminate rough, non-designed surfaces caused by printing. Adhesive can be applied and plastic film can be pasted. After the entire template is assembled, the internal wall can be poured. After curing for 1-2 days, the template can be disassembled from top to bottom for reuse.

[0064] The present invention and its embodiments have been described above illustratively. This description is not restrictive and is merely one embodiment of the present invention, and is not actually limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A 3D-printed reusable concrete formwork, characterized in that: The template module (400) can be divided into multiple modules, and the multiple modules are assembled together to form a closed template module (400). Each module is filled with a steel reinforcement body (200). A positioning component 1 (210) is provided on the steel reinforcement body (200) in a certain module, and a positioning component 2 (220) is provided on the steel reinforcement body (200) in the adjacent module. The steel reinforcement bodies (200) in different modules are distributed in a layered staggered manner in the height direction, and the positioning component 1 (210) and positioning component 2 (220) are distributed at different heights. The projection of positioning component 1 (210) and positioning component 2 (220) on the horizontal plane is a snap fit with a gap between them, so that after the template module (400) is printed, it can be cut along the fit gap between positioning component 1 (210) and positioning component 2 (220) to divide the template module (400) into multiple modules. Positioning component one (210) has a positioning groove (211) inside, and positioning component two (220) has a corresponding positioning protrusion (221) that can be adapted to the positioning groove (211); the positioning groove (211) and the positioning protrusion (221) are distributed at different heights, and their horizontal projections can be fitted together; a sufficient gap for cutting is reserved between the outer wall of the positioning protrusion (221) and the inner wall of the positioning groove (211); At least one side of the positioning groove (211) is provided with an outer positioning part one (212) that can extend beyond the template module (400), and at least one side of the positioning protrusion (221) is provided with an outer positioning part two (222) that can extend beyond the template module (400). The outer positioning part one (212) and the outer positioning part two (222) can be distributed on the same side of the template module (400) and are arranged vertically to mark the mating position between the positioning groove (211) and the positioning protrusion (221). Multiple sets of guide rings (202) that can extend to the outside of the template module (400) are provided at intervals along the length direction of the main steel bar (200). When multiple template modules (400) are assembled in sequence along the height direction, the guide rings (202) on different template modules (400) are kept vertically corresponding in the height direction. The external connecting steel bars (500) are inserted into the guide rings (202) in the longitudinal direction to connect the multiple template modules (400).

2. The 3D-printed reusable concrete formwork according to claim 1, characterized in that: Multiple sets of positioning clips (203) are provided at intervals along the length direction of the main steel bar (200). The extension length of the positioning clips (203) can cover the printing width of the template module (400). Both ends of the positioning clips (203) in the length direction have downward extending inserts (206). The inserts (206) at both ends cover the inner and outer sides of the printing width of the template module (400).

3. The 3D-printed reusable concrete formwork according to claim 1, characterized in that: The main body of the steel bar (200) is provided with multiple sets of outer extensions (201) at intervals along the length direction. The outer extensions (201) extend toward the outer wall of the template module (400), and the guide ring (202) is fixed at the outer end of the outer extensions (201).

4. A 3D-printed reusable concrete formwork according to claim 1, characterized in that: Both ends of the main body of the steel bar (200) along the length direction are provided with a turning part (204) that intersects the extension direction of the main body of the steel bar (200). The end of the turning part (204) is provided with a positioning component one (210) or a positioning component two (220). The turning part (204) is provided with an outer extension part two (205) extending toward the outer wall of the template module (400). The outer end of the outer extension part two (205) is provided with a guide ring (202).

5. A method for manufacturing a 3D-printed reusable concrete formwork according to any one of claims 1-4, characterized in that, include: S1. Complete the 3D printing of the bottom outline, place the steel bar body (200) on one side of the bottom outline of the template, continue printing to a certain height, and then place the steel bar body (200) on the other side of the template. Repeat this process until the printing height meets the design height to form the template module (400). S2. Cut the template module (400) from top to bottom along the interlocking gap between the main steel bars (200) on different sides of the template module (400), and form multiple modules after cutting.

6. A method for manufacturing a 3D-printed reusable concrete formwork according to claim 5, characterized in that, Also includes: S3. Assemble multiple modules to form a closed template module (400). Vertically stack multiple assembled template modules (400) in sequence, and connect them on the outside of the multiple template modules (400) using external connecting steel bars (500) to assemble an overall template.

7. A method for manufacturing a 3D-printed reusable concrete formwork according to claim 5, characterized in that, In step S1, a rotatable print head (100) is used, and a guide rod (101) is provided on the print head (100) behind the printing path. The guide rod (101) extends longitudinally and its bottom end extends to the bottom of the print head (100), so that a reserved groove is formed on the template surface after the print head (100) prints, and the main body of the steel bar (200) is placed accordingly along the formed reserved groove.

8. A method for manufacturing a 3D-printed reusable concrete formwork according to claim 5, characterized in that, In step S1, multiple sets of guide rings (202) extending to the outside of the module are provided at intervals along the length extension direction on the main body of the steel bar (200), and the guide rings (202) on the multi-layer steel bar main body (200) located on the same side of the template are kept in vertical correspondence; in step S3, after multiple assembled template modules (400) are stacked in sequence, the external connecting steel bars (500) are inserted longitudinally into the multiple guide rings (202) that correspond to the upper and lower sides, thereby connecting the multiple template modules (400).

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