Mortise and tenon joint 3D printing concrete wall column connecting structure and construction method thereof

Abstract

The invention provides a mortise and tenon joint 3D printing concrete wall column connecting structure and a construction method thereof. The mortise and tenon joint 3D printing concrete wall column connecting structure comprises a 3D printing concrete wall formwork set, a 3D printing bearing column formwork, a wall reinforcing mesh, a bearing column reinforcing cage, post-pouring concrete and a UHPC reinforcing concrete layer. Wherein a connecting area is arranged at the top end of the 3D printing bearing column mold shell; the 3D printing concrete wall formwork set is provided with a plurality of wall formworks, each wall formwork is provided with a connecting part, and the connecting parts can be in mortise and tenon interlocking with the connecting areas so as to form a cylindrical structure matched with the 3D printing bearing column formworks. Loads are transferred through mechanical connections and by means of geometric interactions between the members. By means of the interlocking structure, the contact area can be increased, and the shear capacity of the interface can be improved through shape constraint. And the strength and the rigidity of the connecting structure are further enhanced by filling UHPC (Ultra High Performance Concrete). Connection reliability can be improved, cost can be saved, industrialization and greenization of modern buildings are achieved, and a sustainable building mode is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and in particular to a mortise and tenon 3D printed concrete wall column connection structure and a construction method thereof. Background Art

[0002] As a revolutionary application of additive manufacturing in the field of construction, 3D printed concrete has achieved rapid development in recent years. It is estimated that this technology can save 50-80% of labor costs, reduce 30-60% of construction waste, and completely eliminate formwork costs. In the 3D printed structural system, the connection between the load-bearing column and the wall is the key to ensuring the integrity and safety of the structure. The complex stress state in the wall-column connection area requires that the connection design must not only meet the strength requirements, but also consider ductility, durability and construction feasibility. However, especially when subjected to shear stress and tensile stress, the interface between 3D printed layers itself has potential weak links, and its bonding strength directly affects the overall mechanical properties of the structure. In addition, the realization of effective alternative reinforcement measures in the connection area is the main bottleneck of the current young technology. The traditional way of placing steel bars often conflicts with the automated and continuous printing process. The existing connection methods have great limitations in terms of structural performance, construction efficiency and cost-effectiveness. How to design a mortise and tenon 3D printed concrete wall column connection technology with efficient construction and reliable strength is an urgent problem to be solved in the current field of building structure technology. Summary of the invention

[0003] The present invention provides a mortise and tenon 3D printed concrete wall column connection structure and a construction method thereof, aiming to improve at least one of the above-mentioned technical problems.

[0004] In order to solve the above technical problems, the present invention provides a mortise and tenon 3D printed concrete wall column connection structure, comprising a 3D printed concrete wall form group, a 3D printed load-bearing column form, a wall steel mesh and a load-bearing column steel cage; the top end of the 3D printed load-bearing column form is axially provided with a connection area; the 3D printed concrete wall form group is provided with a plurality of wall formworks connected and arranged on the peripheral side of the 3D printed load-bearing column form, each wall formwork is constructed with a connection part, and the connection part can be interlocked with the mortise and tenon of the connection area respectively to form a columnar structure matching the 3D printed load-bearing column form; the wall steel mesh is used to be implanted in the inner cavity of the wall form; the load-bearing column steel cage is used to be implanted in the inner cavity of the 3D printed load-bearing column form; it also includes post-cast concrete respectively cast in the inner cavity of the wall form and the inner cavity of the 3D printed load-bearing column form; a UHPC reinforced concrete layer is also cast on the upper end of the post-cast concrete.

[0005] As a further optimization, the bottom end of the 3D printed load-bearing column formwork extends radially outward with a column foot having the same length as the wall formwork, and the column foot is connected and provided at the bottom end of the wall formwork.

[0006] As a further optimization, a plurality of foot anchoring key teeth are arranged at the top end of the column foot, and the foot anchoring key teeth are used for implanting and fixing the wall steel mesh.

[0007] As a further optimization, the wall steel mesh includes longitudinal steel bars of the steel mesh and transverse steel bars of the steel mesh.

[0008] As a further optimization, the load-bearing column steel cage includes longitudinal steel bars of the steel cage and transverse steel bars of the steel cage.

[0009] As a further optimization, the 3D printed concrete wall formwork group is provided with three wall formworks, namely a first wall formwork, a second wall formwork and a third wall formwork, and the three wall formworks are arranged in a T shape at the side end of the 3D printed load-bearing column formwork.

[0010] As a further optimization, the first wall formwork, the second wall formwork and the third wall formwork are respectively provided with a first connecting part, a second connecting part and a third connecting part; the first connecting part is used for connecting in the lower area of the connecting area, the third connecting part is used for connecting in the middle area of the connecting area, and the second connecting part is used for connecting in the upper area of the connecting area.

[0011] The present invention also provides a construction method of the mortise and tenon 3D printed concrete wall-column connection structure as described in any one of the above, including the following steps: S1: Print the 3D printed concrete wall formwork group, and print the main body of the wall formwork in a layer-by-layer upward printing manner; subsequently, respectively take support surface structure measures for the first connecting part, the second connecting part and the third connecting part extending out of the main body of the wall formwork for printing work; S2: Print the 3D printed load-bearing column formwork and bind the wall steel mesh. First, print the column foot and the foot anchoring key teeth, and then print the main structure of the 3D printed load-bearing column formwork layer by layer upward until the connecting area is formed; wherein, holes need to be reserved at the center of the foot anchoring key teeth for implanting the longitudinal steel bars of the steel mesh, and the transverse steel bars of the steel mesh are bound to form the wall steel mesh; S3: Manufacture the transverse steel bars of the steel cage, place the vertical steel bars of the steel cage around the inner side of the transverse steel bars of the steel cage in equal intervals in sequence and bind them, and then sleeved the remaining transverse steel bars of the steel cage on the vertical steel bars of the steel cage at equal intervals for positioning, and bind them in sequence to form the load-bearing column steel cage; place it in the inner cavity formed by the 3D printed load-bearing column formwork through hoisting and positioning; S4: Assemble the 3D printed concrete wall formwork group and the 3D printed load-bearing column formwork. Lift the wall formworks in different directions to above the column feet in each direction respectively, and then lower them and pass through the wall steel mesh. At the same time, sequentially interlock and connect at the connection area at the top end of the 3D printed load-bearing column formwork main body through the first connection part, the third connection part, and the second connection part; S5: Fill the inner cavities of the wall formwork and the 3D printed load-bearing column formwork with post-cast concrete and UHPC reinforced concrete layer respectively to complete the wall-column construction work.

[0012] Among them, when filling the inner cavity of the wall formwork, first use post-cast concrete to fill the inner cavity of the wall formwork to the bottom height of the second connection part, and then use UHPC reinforced concrete layer to fill to the top end of the inner cavity of the wall formwork; when filling the inner cavity of the 3D printed load-bearing column formwork, first use post-cast concrete to fill the inner cavity of the 3D printed load-bearing column formwork to the bottom height of the connection area, and then use UHPC reinforced concrete layer to fill to the connection area between the first connection part, the third connection part, and the second connection part.

[0013] By adopting the above technical solutions, the present invention can achieve the following technical effects: A mortise and tenon 3D printed concrete wall-column connection structure and its construction method provided by the present application. The load-bearing columns and concrete walls of the present application are mainly made of 3D printed concrete, cast-in-place concrete, and ultra-high performance concrete (UHPC), and steel meshes and steel cages are arranged inside them. The construction method of using 3D printed concrete to print load-bearing columns and concrete wall formworks to form connection cavities, implant steel meshes and steel cages, and pour post-cast concrete is adopted. The load is transmitted through mechanical connection and relying on the interaction of the geometric shapes between components. This interlocking structure can increase the contact area and use shape constraints to improve the shear resistance of the interface. At the bottom of the wall-column joint, using the shear key principle, raised foot anchor key teeth are printed on the column foot connection interface, and then the foot anchor key teeth are embedded with the post-cast concrete. At the top of the wall-column joint, using the high degree of freedom of 3D printing, geometrically interlocking mortise and tenon structures are directly printed on the wall-column contact surface. In addition, UHPC is filled at the top of the wall-column to further enhance the strength and stiffness of the connection structure. Compared with the traditional 3D printed wall-column connection method, it can not only increase the connection reliability, but also save costs, realize the industrialization and greening of modern architecture, and form a sustainable building model. Description of the Drawings

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram when the mortise and tenon 3D printing concrete wall-column connection structure in the embodiment of the present invention is disassembled; Figure 2 It is a schematic structural diagram of the 3D printed load-bearing column formwork in the embodiment of the present invention; Figure 3 It is a schematic structural diagram of the 3D printed concrete wall formwork group in the embodiment of the present invention; Figure 4 It is a schematic structural diagram of the wall steel bar mesh and the load-bearing column steel bar cage in the embodiment of the present invention; Figure 5 It is a schematic structural diagram of the assembly and pouring stage in the embodiment of the present invention; Figure 6 It is a schematic structural diagram of the UHPC reinforced concrete layer pouring stage in the embodiment of the present invention; Markings in the figure: 1, wall formwork; 2, 3D printed load-bearing column formwork; 3, wall steel bar mesh; 4, load-bearing column steel bar cage; 5, post-cast concrete; 6, UHPC reinforced concrete layer; 11, first connection part; 12, second connection part; 13, third connection part; 21, connection area; 22, column foot; 23, foot anchor key teeth; 31, longitudinal steel bars of the steel bar mesh; 32, transverse steel bars of the steel bar mesh; 41, longitudinal steel bars of the steel bar cage; 42, transverse steel bars of the steel bar cage. Specific Embodiments

[0016] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0017] By Figures 1 to 3As shown in the figure, an embodiment of the present invention provides a mortise and tenon 3D printed concrete wall-column connection structure, including a 3D printed concrete wall formwork group, a 3D printed load-bearing column formwork 2, a wall steel bar mesh 3, and a load-bearing column steel bar cage 4; a connection area 21 is axially provided at the top end of the 3D printed load-bearing column formwork 2, and a plurality of convex structures are axially formed in the connection area 21 to form a groove. The 3D printed concrete wall formwork group is provided with a plurality of wall formworks 1 connected to the periphery of the 3D printed load-bearing column formwork 2. Each wall formwork 1 is constructed with a connection part, and the connection part can be mortised and tenoned with the connection area 21 respectively to form a columnar structure matching the main body of the 3D printed load-bearing column formwork 2.

[0018] In this embodiment, the 3D printed concrete wall formwork group is provided with three wall formworks 1, namely a first wall formwork, a second wall formwork, and a third wall formwork. The three wall formworks 1 are arranged in a T shape from three directions at the side end of the 3D printed load-bearing column formwork 2.

[0019] Preferably, the first wall formwork, the second wall formwork, and the third wall formwork are respectively provided with a first connection part 11, a second connection part 12, and a third connection part 13; the first connection part 11 is used to connect to the lower area of the connection area 21, the third connection part 13 is used to connect to the middle area of the connection area 21, and the second connection part 12 is used to connect to the upper area of the connection area 21. After being installed and connected in the order from bottom to top, the connection part and the connection area 21 can form a complete columnar structure, with a closed outer periphery, so that concrete can be filled inside, and the connection strength between the wall and the column can be greatly enhanced. There are various shape and structure ways of the fitting connection, which will not be elaborated here.

[0020] It should be noted that this embodiment shows a mortise and tenon connection structure of wall columns in three directions, which is also applicable to the mortise and tenon connection structures of wall columns in two directions and four directions. For the mortise and tenon connection structures of wall columns in two directions and four directions, it is necessary to increase or decrease the printing height of local positions in the connection area 21 of the 3D printed load-bearing column to ensure the normal progress of the grouting work when pouring the ultra-high performance concrete (UHPC) reinforcement layer, which will not be elaborated here.

[0021] Preferably, the wall steel bar mesh 3 is used to be implanted into the inner cavity of the wall formwork 1; the load-bearing column steel bar cage 4 is used to be implanted into the inner cavity of the 3D printed load-bearing column formwork 2. Among them, the wall steel bar mesh 3 includes a longitudinal steel bar 31 of the steel bar mesh and a transverse steel bar 32 of the steel bar mesh. The load-bearing column steel bar cage 4 includes a longitudinal steel bar 41 of the steel bar cage and a transverse steel bar 42 of the steel bar cage.

[0022] Furthermore, the wall-column connection structure of the present application further includes post-cast concrete 5 respectively poured into the inner cavity of the wall formwork 1 and the inner cavity of the 3D printed load-bearing column formwork 2; a UHPC reinforcement concrete layer 6 is also poured at the upper end of the post-cast concrete 5. Particularly, filling the UHPC reinforcement concrete layer 6 between the structures formed by the connection of the first connection part 11, the second connection part 12, and the third connection part 13 in the connection area 21 can greatly enhance the wall-column connection performance.

[0023] Preferably, the bottom end of the 3D printed load-bearing column formwork 2 radially extends outward with a column foot 22 having the same length as the wall formwork 1, and the column foot 22 is connected and arranged at the bottom end of the wall formwork 1. It should be noted that the inner cavity of the wall formwork 1 is arranged to be vertically through, and the column foot 22 is used as the base of the wall formwork 1 and also serves to seal the bottom of the inner cavity.

[0024] Furthermore, a plurality of foot anchoring key teeth 23 are arranged in an array at the top end of the column foot 22. The foot anchoring key teeth can be embedded in the concrete after pouring the concrete, which is used to resist the interfacial shear force. At the same time, the foot anchoring key teeth can be used to implant and fix the wall steel mesh 3.

[0025] The present application also provides a construction method for the mortise and tenon 3D printed concrete wall-column connection structure as described in any one of the above, including the following steps: S1: Print the 3D printed concrete wall formwork group, and print the main body of the wall formwork 1 in a layer-by-layer upward printing manner; subsequently, respectively take support surface structure measures for the first connection part 11, the second connection part 12, and the third connection part 13 extending out of the main body of the wall formwork 1 for printing work; S2: Print the 3D printed load-bearing column formwork 2 and bind the wall steel mesh 3. First, print the column foot 22 and the foot anchoring key teeth 23, and then layer-by-layer upward print the main structure of the 3D printed load-bearing column formwork 2 until the connection area 21 is formed; among them, holes need to be reserved at the center of the foot anchoring key teeth 23 for implanting the longitudinal steel bars 31 of the steel mesh, and the transverse steel bars 32 of the steel mesh are bound to form the wall steel mesh 3; S3: Manufacture the transverse steel bars 42 of the steel reinforcement cage, place the vertical steel bars of the steel reinforcement cage at equal intervals along the inner side of the transverse steel bars 42 of the steel reinforcement cage in sequence and bind them, and then sleeve the remaining transverse steel bars 42 of the steel reinforcement cage on the vertical steel bars of the steel reinforcement cage at equal intervals for positioning, and bind them in sequence to form the load-bearing column steel reinforcement cage 4; place it in the inner cavity formed by the 3D printed load-bearing column formwork 2 through hoisting and positioning; S4: Assemble the 3D printed concrete wall formwork group and the 3D printed load-bearing column formwork 2. Lift the wall formworks 1 in different directions above the column feet 22 in each direction respectively, and then lower and pass through the wall steel mesh 3, and at the same time, perform interlocking connection at the connection area 21 at the top end of the main body of the 3D printed load-bearing column formwork 2 through the first connection part 11, the third connection part 13, and the second connection part 12 in sequence; S5: Fill the post-cast concrete 5 and the UHPC reinforced concrete layer 6 into the inner cavities of the wall formwork 1 and the 3D printed load-bearing column formwork 2 respectively, and complete the wall and column construction work.

[0026] Specifically, when filling the inner cavity of the wall formwork 1, first use the post-cast concrete 5 to fill the inner cavity of the wall formwork 1 to the bottom height of the second connecting part 12, and then use the UHPC reinforced concrete layer 6 to fill to the top of the inner cavity of the wall formwork 1; when filling the inner cavity of the 3D printed load-bearing column formwork 2, first use the post-cast concrete 5 to fill the inner cavity of the 3D printed load-bearing column formwork 2 to the bottom height of the connection area 21, and then use the UHPC reinforced concrete layer 6 to fill into the connection area 21 between the first connecting part 11, the third connecting part 13 and the second connecting part 12.

[0027] In summary, the load-bearing columns and concrete walls of this application use 3D printed concrete, cast-in-place concrete, and ultra-high performance concrete (UHPC) as the main materials, and a steel mesh and a steel reinforcement cage are arranged inside them. The construction method of using 3D printed concrete to print the load-bearing columns to form a connection cavity with the concrete wall formwork 1, implanting the steel mesh and the steel reinforcement cage, and pouring the post-cast concrete 5 is adopted. Loads are transmitted through mechanical connection and by relying on the interaction of the geometric shapes between components. This interlocking structure can increase the contact area and utilize shape constraints to improve the shear resistance of the interface. At the bottom of the wall-column joint, using the shear key principle, raised foot anchoring key teeth 23 are printed on the connection interface of the column foot 22, and then the foot anchoring key teeth 23 are embedded with the post-cast concrete 5. At the top of the wall-column joint, using the high degree of freedom of 3D printing, a geometrically interlocking mortise and tenon structure is directly printed on the wall-column contact surface. In addition, UHPC is filled at the top of the wall and column to further enhance the strength and stiffness of the connection structure. Compared with the traditional 3D printed wall-column connection method, it can not only disassemble the structural components for production, transportation and assembly, but also increase the connection reliability, save costs, realize the industrialization and greening of modern architecture, and form a sustainable building model.

[0028] The above description is only the preferred implementation manner of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mortise and tenon 3D printed concrete wall-column connection structure, characterized in that It includes a 3D printed concrete wall formwork group, a 3D printed load-bearing column formwork, a wall steel bar mesh, and a load-bearing column steel bar cage. A connection area is axially provided at the top end of the 3D printed load-bearing column formwork. The 3D printed concrete wall formwork group is provided with a plurality of wall formworks connected to the periphery of the 3D printed load-bearing column formwork. Each wall formwork is constructed with a connection part, and the connection part can be tenon-mortise interlocked with the connection area respectively to form a columnar structure matching the 3D printed load-bearing column formwork. The wall steel bar mesh is used to be implanted into the inner cavity of the wall formwork; the load-bearing column steel bar cage is used to be implanted into the inner cavity of the 3D printed load-bearing column formwork. It also includes post-cast concrete respectively poured into the inner cavity of the wall formwork and the inner cavity of the 3D printed load-bearing column formwork; a UHPC reinforcement concrete layer is also poured at the upper end of the post-cast concrete.

2. The tenon-mortise 3D printed concrete wall-column connection structure according to claim 1, characterized in that , A column foot with the same length as the wall formwork extends radially outward at the bottom end of the 3D printed load-bearing column formwork, and the column foot is connected to the bottom end of the wall formwork.

3. The tenon-mortise 3D printing concrete wall-column connection structure according to claim 2, characterized in that , A plurality of foot anchoring key teeth are arranged in a row at the top end of the column foot, and the foot anchoring key teeth are used to be implanted and fixed the wall steel bar mesh.

4. The tenon-mortise 3D printed concrete wall-column connection structure according to claim 1, characterized in that , The wall steel bar mesh includes longitudinal steel bars of the steel bar mesh and transverse steel bars of the steel bar mesh.

5. The tenon-mortise 3D printing concrete wall-column connection structure according to claim 1, characterized in that , The load-bearing column steel bar cage includes longitudinal steel bars of the steel bar cage and transverse steel bars of the steel bar cage.

6. The tenon-mortise 3D printed concrete wall-column connection structure according to claim 1, characterized in that , The 3D printed concrete wall formwork group is provided with three wall formworks, namely the first wall formwork, the second wall formwork, and the third wall formwork. The three wall formworks are arranged in a T shape at the side end of the 3D printed load-bearing column formwork.

7. A tenon-mortise 3D printed concrete wall-column connection structure according to claim 6, characterized in that , The first wall formwork, the second wall formwork, and the third wall formwork are respectively provided with a first connection part, a second connection part, and a third connection part; the first connection part is used to connect to the lower area of the connection area, the third connection part is used to connect to the middle area of the connection area, and the second connection part is used to connect to the upper area of the connection area.

8. A construction method of the mortise and tenon 3D printed concrete wall-column connection structure according to any one of claims 1-7, characterized in that, It includes the following steps: S1: Print the 3D printed concrete wall formwork group, and print the main body of the wall formwork in a layer-by-layer upward printing manner; subsequently, support surface structure measures are respectively taken for the first connection part, the second connection part, and the third connection part extending out of the main body of the wall formwork for printing work. S2: Print the 3D printed load-bearing column formwork and bind the wall steel bar mesh. First, print the column foot and the foot anchoring key teeth, and then layer-by-layer upward print the main structure of the 3D printed load-bearing column formwork until the connection area is formed; among them, a hole needs to be reserved at the center of the foot anchoring key tooth for implanting the longitudinal steel bars of the steel bar mesh, and the transverse steel bars of the steel bar mesh are bound to form the wall steel bar mesh. S3: Manufacture the transverse steel bars of the steel bar cage, place the vertical steel bars of the steel bar cage at equal intervals along the inner side of the transverse steel bars of the steel bar cage in sequence and bind them. Subsequently, the remaining transverse steel bars of the steel bar cage are sleeved on the vertical steel bars of the steel bar cage at equal intervals for positioning, and are bound in sequence to form the load-bearing column steel bar cage; it is placed in the inner cavity formed by the 3D printed load-bearing column formwork through hoisting and positioning. S4: Assemble the 3D printed concrete wall formwork group and the 3D printed load-bearing column formwork. Lift the wall formworks in different directions to above the column feet in each direction respectively, and then lower them and pass through the wall steel mesh. At the same time, perform interlocking connections at the connection area at the top of the 3D printed load-bearing column formwork main body in sequence through the first connection part, the third connection part, and the second connection part; S5: Fill the inner cavities of the wall formwork and the 3D printed load-bearing column formwork with post-cast concrete and UHPC reinforced concrete layer respectively to complete the wall-column construction work.

9. The construction method of the mortise and tenon 3D printed concrete wall-column connection structure according to claim 8, characterized in that , When filling the inner cavity of the wall formwork, first fill the inner cavity of the wall formwork with post-cast concrete to the bottom height of the second connection part, and then fill the top of the inner cavity of the wall formwork with the UHPC reinforced concrete layer; When filling the inner cavity of the 3D printed load-bearing column formwork, first fill the inner cavity of the 3D printed load-bearing column formwork with post-cast concrete to the bottom height of the connection area, and then fill the connection area between the first connection part, the third connection part, and the second connection part with the UHPC reinforced concrete layer.

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