Fiber-reinforced 3D printing concrete beam with separated reinforcing bars

Abstract

The utility model provides a fiber reinforced 3D printing concrete beam with separated reinforcing bars, which comprises a bottom protective layer, longitudinal bar meshes, a plurality of reinforcing bars, a plurality of reinforcing bars and a plurality of fiber reinforced concrete layers, wherein the longitudinal bar meshes are arranged at the top end of the bottom protective layer along the length direction; the 3D printing concrete main body is arranged at the top end of the bottom protection layer, the 3D printing concrete main body is filled with hybrid fiber 3D printing concrete and wraps the longitudinal bar mesh, and a plurality of hole channels are reserved in the hybrid fiber 3D printing concrete; the multiple stirrups are correspondingly inserted into the hole channels respectively, and structural adhesives are filled between the hole channels and the stirrups for filling and fixing; the erection rib mesh is arranged at the top end of the 3D printing concrete main body in the length direction and is wrapped by the hybrid fiber 3D printing concrete; the top protection layer is arranged at the top end of the 3D printing concrete main body. The 3D printing concrete beam has the advantages that configuration of longitudinal bars in the horizontal direction and stirrups in the vertical direction of the beam can be achieved, the bending performance and the shearing performance of the 3D printing concrete beam are improved, and the shrinkage performance and the after-crack mechanical performance of 3D printing concrete are improved in a fiber mixing mode.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing concrete, and in particular to a fiber-reinforced 3D printing concrete beam with separate reinforcement. Background Art

[0002] In recent years, the research and application of 3D printing technology in the field of construction engineering has received more and more attention. Compared with traditional construction methods, 3D printing concrete technology has the advantages of no need for formwork, intelligent construction, and shorter construction period. 3D printing concrete technology is based on a three-dimensional model designed in advance by a computer. The concrete is extruded according to the path set by the computer and constructed in the form of layered stacking. There is no formwork support in the whole process, and the accumulation of the upper layer of concrete needs to rely on the support of the lower layer of concrete.

[0003] In addition, due to the special layer-by-layer stacking molding method of 3D printed concrete, the traditional method of embedding reinforcement in concrete components is no longer applicable to 3D printed concrete. That is, it is difficult to complete the simultaneous implantation of longitudinal steel bars and stirrups while printing concrete, resulting in the inability of 3D printed components to meet complex stress states, affecting the bearing capacity of the components. Furthermore, since the cement content in the mix ratio of 3D printed concrete is often very high, it is easy to cause shrinkage problems of concrete; and 3D printed concrete has a certain brittleness and is prone to cracking. Utility Model Content

[0004] The technical problem to be solved by the present invention is to realize the configuration of the horizontal longitudinal reinforcement and the vertical stirrups of the beam, improve the bending and shearing properties of the 3D printed concrete beam, improve the shrinkage performance and the mechanical properties after cracking. In order to overcome the defects of the above-mentioned prior art (or related technology), the present invention provides a fiber-reinforced 3D printed concrete beam with separate reinforcement.

[0005] The utility model provides a fiber-reinforced 3D printed concrete beam with separate reinforcement, comprising:

[0006] A bottom protective layer, wherein a longitudinal rib mesh is provided on the top of the bottom protective layer along the length direction;

[0007] A 3D printed concrete body is arranged at the top of the bottom protective layer, the 3D printed concrete body is filled with mixed fiber 3D printed concrete and wraps the longitudinal reinforcement mesh, and a plurality of channels are reserved inside the mixed fiber 3D printed concrete, one end opening of each channel is located at the top of the 3D printed concrete body, and the other end opening of each channel is located at the bottom of the 3D printed concrete body;

[0008] A plurality of stirrups whose number matches the holes are inserted into the holes one by one, and structural adhesive is poured between the holes and the stirrups for filling and fixing;

[0009] A reinforcement mesh is arranged at the top of the 3D printed concrete body along the length direction and is wrapped by the mixed fiber 3D printed concrete;

[0010] A top protective layer is arranged on the top of the 3D printed concrete body.

[0011] Compared with the prior art, the fiber-reinforced 3D printed concrete beam with separate reinforcement in the present application has the following advantages: the bending member is in the form of 3D printed concrete, the reinforcement adopts separate reinforcement, and the method of reserved channels, inserted stirrups, and bonded with structural adhesives is adopted to effectively solve the reinforcement difficulties of 3D printed concrete, realize the configuration of horizontal longitudinal reinforcement and vertical stirrups of the beam, and improve the bending and shear properties of the 3D printed concrete beam. In addition, the addition of mixed fibers can improve the shrinkage performance of 3D printed concrete and the mechanical properties after cracking.

[0012] In a possible implementation, the longitudinal reinforcement mesh and the vertical reinforcement mesh are steel meshes formed by welding or binding deformed steel bars.

[0013] Compared with the prior art, the above technical solution can provide multiple possibilities for the selection of longitudinal reinforcement mesh and vertical reinforcement mesh to adapt to different application scenarios.

[0014] In a possible implementation manner, the axial direction of each of the holes is perpendicular to the length direction of the bottom protective layer, or forms an angle of 45 degrees with the horizontal plane.

[0015] Compared with the prior art, the above technical solution can provide a variety of possible combinations for the opening direction and arrangement structure of the channel to adapt to different application scenarios.

[0016] In a possible implementation, the structural adhesive is epoxy resin or cement slurry.

[0017] Compared with the prior art, the above technical solution can provide multiple possibilities for the selection of structural adhesives to adapt to different application scenarios.

[0018] In a possible implementation, the cement slurry is cement mortar or cement paste having the same proportion as that of the 3D printed concrete body.

[0019] In a possible implementation manner, the cross-sectional shape of each of the channels is rectangular, square or circular.

[0020] In a possible implementation, the hybrid fiber 3D printing concrete is composed of concrete mixed with two or more fibers of different lengths, wherein the long fibers are structural fibers and have a length of not less than 30 mm.

[0021] Compared with the existing technology, the above technical solution can improve the shrinkage performance of 3D printed concrete and the mechanical properties after cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a side view structural schematic diagram of the utility model;

[0024] Figure 3 It is a schematic diagram of the top view structure of the utility model;

[0025] Figure 4 It is a front view structural schematic diagram of the vertical duct of the utility model;

[0026] Figure 5 It is a front view structural schematic diagram of the oblique hole of the utility model;

[0027] Explanation of the accompanying drawings: 1. bottom protective layer; 2. longitudinal reinforcement mesh; 3. 3D printed concrete body; 4. mixed fiber 3D printed concrete; 5. channel; 6. stirrups; 7. structural adhesive; 8. frame reinforcement mesh; 9. top protective layer. DETAILED DESCRIPTION

[0028] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0029] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See also Figure 1-Figure 3The embodiment of the present application discloses a fiber-reinforced 3D printed concrete beam with separated reinforcement, comprising a bottom protective layer 1, a longitudinal reinforcement mesh 2, a 3D printed concrete body 3, a mixed fiber 3D printed concrete 4, a duct 5, a stirrup 6, a structural adhesive 7, a frame reinforcement mesh 8 and a top protective layer 9. The longitudinal reinforcement mesh 2 is arranged at the top of the bottom protective layer 1 along the length direction, the 3D printed concrete body 3 is arranged at the top of the bottom protective layer 1, the 3D printed concrete body 3 is filled with mixed fiber 3D printed concrete 4 and wraps the longitudinal reinforcement mesh 2, and the mixed fiber 3D printed concrete 4 is filled with mixed fiber 3D printed concrete 4 and wraps the longitudinal reinforcement mesh 2. A plurality of channels 5 are reserved inside the 3D printed concrete 4, one end of each channel 5 is opened at the top of the 3D printed concrete body 3, and the other end of each channel 5 is opened at the bottom of the 3D printed concrete body 3, and each stirrup 6 is inserted into the corresponding channel 5, respectively. Structural adhesive 7 is filled between each channel 5 and each stirrup 6 for filling and fixing. The frame reinforcement mesh 8 is arranged at the top of the 3D printed concrete body 3 along the length direction and is wrapped by the mixed fiber 3D printed concrete 4, and the top protective layer 9 is arranged at the top of the 3D printed concrete body 3.

[0031] The hybrid fiber 3D printed concrete 4 in the present application can effectively limit shrinkage cracks by adding short fiber materials; in addition, adding long structural fibers into the matrix of 3D printed concrete can effectively limit the expansion of structural cracks in 3D printed concrete; mixing fibers of different sizes can give play to the advantages of different fibers and reflect a positive hybrid effect.

[0032] The stirrups 8 in the present application can be made of ordinary steel bars or FRP bars (fiber reinforced plastic bars).

[0033] The channels 5 in the present application are reserved during the printing process, and can also be drilled by a drilling machine after the 3D printed concrete hardens. The spacing and number of the channels 5 are designed according to demand and purpose, and the position of the channels 5 in the cross section needs to avoid the position of the longitudinal reinforcement mesh 2.

[0034] Embodiment 1

[0035] See also Figure 1 , Figure 2 and Figure 4 In this embodiment, a separated reinforced 3D printed concrete beam includes a bottom protective layer 1, a longitudinal reinforcement mesh 2, a main body 3D printed concrete 3, a channel 5, a frame reinforcement mesh 8, a top protective layer 9, a structural adhesive 7, stirrups 6, and a mixed fiber 3D printed concrete 4. First, according to the thickness of the protective layer, the bottom protective layer 1 is printed by a 3D printer; then, the longitudinal reinforcement mesh 2 is arranged at a specified position, and then the main body 3D printed concrete 3 is printed. During the printing process, a channel 5 is reserved in the vertical direction, stirrups 6 are inserted into the channel 5, and structural adhesive 7 is added to the channel 5, and the frame reinforcement mesh 8 is laid. Finally, the top protective layer 9 is printed to form the above-mentioned separated reinforced hybrid fiber reinforced 3D printed concrete beam.

[0036] Among them, the diameter of the longitudinal reinforcement is 20mm, the channel 5 is arranged in the vertical direction, the diameter is 1.2-1.5 times the diameter of the stirrup 6, and the spacing is 200mm; the stirrup 6 adopts smooth round steel bars with a diameter of 8mm, the diameter of the frame reinforcement is 10mm, the beam cross-section size is 300mm*500mm, and the short fibers in the mixed fibers adopt polypropylene fibers with a length of 12mm, and the long fibers adopt polypropylene fibers with a length of 30mm.

[0037] Embodiment 2

[0038] See also Figure 1 , Figure 2 and Figure 5 In this embodiment, a separated reinforced hybrid fiber reinforced 3D printed concrete beam includes a bottom protective layer 1, a longitudinal reinforcement mesh 2, a main body 3D printed concrete 3, a channel 5, a frame reinforcement mesh 8, a top protective layer 9, a structural adhesive 7, a stirrup 6, and a hybrid fiber 3D printed concrete 4. First, according to the thickness of the protective layer, the bottom protective layer 1 is printed by a 3D printer; then, the longitudinal reinforcement mesh 2 is arranged at a specified position, and then the main body 3D printed concrete 3 is printed, and the frame reinforcement mesh 8 is laid, and finally the top protective layer 9 is printed. Before the 3D printed concrete is dried and hardened, a hole is drilled at a predetermined position, and the channel 5 passes through the height of the beam section. The angle between the channel 5 and the axis of the concrete beam is 45 degrees. Then, epoxy resin is poured into the channel 5, stirrups 6 are inserted, and the channel 5 is filled with structural adhesive 7 to form the above-mentioned separated reinforced 3D printed concrete beam.

[0039] The diameter of the longitudinal reinforcement is 20mm, the hole 5 is arranged in the vertical direction, the diameter is 1.2-1.5 times the diameter of the stirrup 6, and the spacing is 200mm; the stirrup 6 is a ribbed steel bar with a diameter of 12mm, and the diameter of the frame reinforcement is 10mm. The cross-sectional size of the beam is 300mm*500mm, and the short fibers in the mixed fibers are polypropylene fibers with a length of 12mm, and the long fibers are polypropylene fibers with a length of 30mm.

[0040] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A fiber-reinforced 3D printed concrete beam with separate reinforcement, characterized in that: include: A bottom protective layer (1), wherein a longitudinal rib mesh (2) is provided at the top of the bottom protective layer (1) along the length direction; A 3D printed concrete body (3) is arranged at the top of the bottom protective layer (1), wherein the 3D printed concrete body (3) is filled with mixed fiber 3D printed concrete (4) and wraps the longitudinal reinforcement mesh (2), wherein a plurality of channels (5) are reserved inside the mixed fiber 3D printed concrete (4), wherein one end opening of each channel (5) is located at the top of the 3D printed concrete body (3), and the other end opening of each channel (5) is located at the bottom of the 3D printed concrete body (3); A plurality of stirrups (6) whose number matches that of each of the holes (5) are inserted into each of the holes (5) in a one-to-one correspondence, and structural glue (7) is poured between each of the holes (5) and each of the stirrups (6) for filling and fixing; A reinforcement mesh (8) is arranged at the top of the 3D printed concrete body (3) along the length direction and is wrapped by the mixed fiber 3D printed concrete (4); A top protective layer (9) is arranged on the top of the 3D printed concrete body (3).

2. The fiber-reinforced 3D printed concrete beam according to claim 1, characterized in that: The longitudinal reinforcement mesh (2) and the vertical reinforcement mesh (8) are steel reinforcement meshes formed by welding or binding deformed steel bars.

3. The fiber-reinforced 3D printed concrete beam according to claim 1, characterized in that: The axial direction of each of the holes (5) is perpendicular to the length direction of the bottom protective layer (1), or forms an angle of 45 degrees with the horizontal plane.

4. The fiber-reinforced 3D printed concrete beam according to claim 1, characterized in that: The structural adhesive (7) is epoxy resin or cement slurry.

5. The fiber-reinforced 3D printed concrete beam according to claim 4, characterized in that: The cement slurry is cement mortar or cement paste with the same proportion as the 3D printed concrete body.

6. The fiber-reinforced 3D printed concrete beam according to claim 1, characterized in that: The cross-sectional shape of each of the holes (5) is rectangular, square or circular.

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