A wall-column structure for 3D printing of buildings and its construction method

Abstract

A wall-column structure for 3D printing of buildings and its construction method. The wall-column structure includes a concrete structural floor slab, embedded steel bars, 3D printed inner walls, 3D printed outer walls, 3D printed internal ribs of the wall, a structural column steel reinforcement cage, and cast-in-place column concrete. In the present invention, a special on-site 3D printing device is used for the construction of 3D printed walls. After printing and constructing to a certain height, the overlapping steel bars are connected to the embedded steel bars through steel sleeves. After continuing to print and construct to the single-story height, the structural column steel reinforcement cage is installed. Finally, cast-in-place concrete is poured to form an integral structure between the structural column and the 3D printed wall. The present invention solves the problems of poor integrity and low structural safety of on-site 3D printed buildings, improves the structural stability of on-site 3D printed building technology, and ensures the construction quality.

Description

Technical Field

[0001] The invention belongs to the field of building construction, and particularly relates to a wall-column structure for building 3D printing and a construction method thereof. Background Art

[0002] Concrete (mortar) 3D printing equipment cannot perform on-site printing construction around a steel reinforcement cage that has been constructed. Therefore, currently, most 3D printed buildings adopt the form of producing 3D printed precast components in a factory and assembling them at the construction site. This construction form not only increases the construction procedures of on-site assembly, fails to reflect the characteristics of intelligent construction of 3D printed buildings, but also the installation of assembly joints affects the integrity of the building to a certain extent, increases the manufacturing cost of the building, and affects the construction quality of the building. Summary of the Invention

[0003] The purpose of the invention is to provide a wall-column structure for building 3D printing and a construction method thereof, aiming to solve the problems that existing 3D printing equipment cannot perform on-site printing construction around a steel reinforcement cage that has been constructed and can only adopt assembly joints, resulting in high building costs, affecting construction quality, poor integrity of the structural columns of on-site 3D printed building construction, and low structural safety.

[0004] To achieve the above purpose, the invention adopts the following technical solutions:

[0005] A wall-column structure for building 3D printing includes a concrete structural floor slab, embedded steel bars, steel bar sleeves, lapped steel bars, a structural column steel reinforcement cage, a 3D printed outer wall, a 3D printed inner wall, 3D printed inner ribs of the wall, and cast-in-place column concrete. The structural column steel reinforcement cage includes vertical main steel bars and horizontal steel bars.

[0006] The 3D printed outer wall and the 3D printed inner wall have the same L-shaped form. The 3D printed inner wall is located inside the 3D printed outer wall. The corners of the 3D printed outer wall, the corners of the 3D printed inner wall, and two 3D printed inner ribs of the wall jointly enclose a column formwork for casting the cast-in-place column concrete. The two ends of the 3D printed inner ribs of the wall are respectively fixedly connected to the outer side of the 3D printed inner wall and the inner side of the 3D printed outer wall.

[0007] A group of embedded steel bars are pre-embedded at the bottom plate of the concrete structure within the enclosed range of the column formwork. The number of the embedded steel bars is the same as that of the vertical main steel bars. The bottom of the embedded steel bars is buried into the bottom plate of the concrete structure, and the top of the embedded steel bars extends out of the upper side of the bottom plate of the concrete structure. The extended part has an external thread. The steel bar sleeves correspond to the number of the embedded steel bars one by one. The inner wall of the steel bar sleeves has an internal thread. The top of the embedded steel bars extends into the bottom of the steel bar sleeves and is threadedly connected thereto. The bottom of the lapping steel bars has an external thread. The lapping steel bars correspond to the number of the embedded steel bars one by one. The bottom of the lapping steel bars extends into the top of the steel bar sleeves and is threadedly connected.

[0008] The bottom of the vertical main steel bars is placed on the top end surface of the steel bar sleeves and is close to one side of the lapping steel bars. Cast-in-place column concrete is poured within the column formwork and wraps the embedded steel bars, steel bar sleeves, lapping steel bars and the structural column steel reinforcement cage that are exposed on the upper side of the bottom plate of the concrete structure.

[0009] The materials of the 3D printed external wall, 3D printed internal wall and 3D printed internal ribs of the wall are concrete or mortar.

[0010] The 3D printed external wall, 3D printed internal wall and 3D printed internal ribs of the wall are integrally constructed by on-site 3D printing equipment.

[0011] The embedded steel bars are fixedly connected to the steel bars of the bottom plate of the concrete structure, and the connection method is welding or binding.

[0012] The steel bar sleeves are steel mechanical connection sleeves.

[0013] The strength grade of the cast-in-place column concrete is C25 - C40.

[0014] The height of the embedded steel bars exposed from the bottom plate of the concrete structure is 10 cm.

[0015] The diameter of the lapping steel bars is the same as that of the embedded steel bars, and the length of the lapping steel bars is not less than 8 times the diameter of the steel bars.

[0016] A construction method for a wall-column structure of building 3D printing includes the following steps:

[0017] Step 1, construct the bottom plate of the concrete structure, and pre-embed embedded steel bars at the position of the structural column;

[0018] Step 2, connect the steel bar sleeves and the embedded steel bars by threads;

[0019] Step 3, use 3D printing special construction equipment to construct the 3D printed external wall, 3D printed internal wall and 3D printed internal ribs of the wall, and form column formwork at the corners;

[0020] Step 4: Stop 3D printing construction when it reaches 10 cm below the height of the subsequent lapped reinforcement.

[0021] Step 5: After connecting the lapped reinforcement to the steel sleeve by threading, repeat Step 3.

[0022] Step 6: Stop 3D printing construction when it reaches the single-layer height. Insert the assembled structural column steel cage at the structural column. Each vertical reinforcement of the structural column steel cage contacts the corresponding lapped reinforcement respectively. The bottom of the vertical reinforcement contacts the top of the steel sleeve and closely abuts against the lapped reinforcement.

[0023] Step 7: Pour the cast-in-place column concrete and vibrate it. Cure it after pouring is completed, and the construction is finished.

[0024] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0025] The present invention uses the on-site constructed 3D printed inner and outer walls as the formwork for the building structural column, and reserves the operation space for the construction of the structural column reinforcement, realizing the integrity of the building structural column and the 3D printed wall. Through the connection of the embedded reinforcement and the steel sleeve, the connection of the steel cage is realized. The construction method of the wall-column structure of the present invention has the characteristics of formwork-free, high construction efficiency and intelligent construction, ensuring the integrity of the building, guaranteeing the construction quality, reducing the construction cost, improving the structural stability of the on-site 3D printed building technology, and ensuring the construction quality. Description of the Drawings

[0026] The following further describes the present invention in detail with reference to the drawings.

[0027] Figure 1 is the structural schematic diagram of the present invention.

[0028] Figure 2 is the connection schematic diagram of the embedded reinforcement and the steel sleeve of the concrete structure floor slab.

[0029] Figure 3 is the connection schematic diagram of the lapped reinforcement and the steel sleeve.

[0030] Figure 4 Connection schematic diagram of the vertical main reinforcement and the lapped reinforcement.

[0031] Reference numerals: 1 - concrete structure floor slab, 2 - embedded reinforcement, 3 - steel sleeve, 4 - 3D printed outer wall, 5 - inner rib of 3D printed wall, 6 - 3D printed inner wall, 7 - lapped reinforcement, 8 - vertical main reinforcement, 9 - cast-in-place column concrete. Detailed Embodiment

[0032] See Figures 1-4As shown in the figure, a wall-column structure for 3D printing of buildings includes a concrete structure base plate 1, embedded steel bars 2, steel bar sleeves 3, lapping steel bars 7, a structural column steel bar cage, a 3D printed outer wall 4, a 3D printed inner wall 6, 3D printed inner ribs 5 of the wall, and cast-in-place column concrete 9. The structural column steel bar cage includes vertical main steel bars 8 and horizontal steel bars.

[0033] The 3D printed outer wall 4 and the 3D printed inner wall 6 have the same L-shaped form. The 3D printed inner wall 6 is located inside the 3D printed outer wall 4. The corners of the 3D printed outer wall 4, the corners of the 3D printed inner wall 6, and the two 3D printed inner ribs 5 of the wall jointly enclose a column formwork for pouring the cast-in-place column concrete 9. The two ends of the 3D printed inner ribs 5 of the wall are respectively fixedly connected to the outer side of the 3D printed inner wall 6 and the inner side of the 3D printed outer wall 4.

[0034] A group of embedded steel bars 2 are pre-embedded at the concrete structure base plate 1 within the enclosed range of the column formwork. The number of the embedded steel bars 2 is the same as the number of the vertical main steel bars 8. The bottom of the embedded steel bars 2 is buried in the concrete structure base plate 1, and the top of the embedded steel bars 2 extends out of the upper side of the concrete structure base plate 1. The extended part has an external thread. The steel bar sleeves 3 correspond to the number of the embedded steel bars 2 one by one. The inner wall of the steel bar sleeves 3 has an internal thread. The top of the embedded steel bars 2 extends into the bottom of the steel bar sleeves 3 and is threadedly connected thereto. The bottom of the lapping steel bars 7 has an external thread. The lapping steel bars 7 correspond to the number of the embedded steel bars 2 one by one. The bottom of the lapping steel bars 7 extends into the top of the steel bar sleeves 3 and is threadedly connected.

[0035] The bottom of the vertical main steel bars 8 is placed on the top end face of the steel bar sleeves 3 and is close to one side of the lapping steel bars 7. The cast-in-place column concrete 9 is poured within the column formwork and wraps the embedded steel bars 2, the steel bar sleeves 3, the lapping steel bars 7, and the structural column steel bar cage exposed on the upper side of the concrete structure base plate 1.

[0036] The materials of the 3D printed outer wall 4, the 3D printed inner wall 6, and the 3D printed inner ribs 5 of the wall are concrete or mortar. The 3D printed outer wall 4, the 3D printed inner wall 6, and the 3D printed inner ribs 5 of the wall are integrally constructed by on-site 3D printing equipment.

[0037] The embedded steel bars 2 are fixedly connected to the steel bars of the concrete structure base plate 1, and the connection method is welding or binding. The steel bar sleeves 3 are steel bar mechanical connection sleeves. The strength grade of the cast-in-place column concrete 9 is C25 - C40. The height of the embedded steel bars 2 exposed from the concrete structure base plate is 10 cm. The diameter of the lapping steel bars 7 is the same as the diameter of the embedded steel bars 2, and the length of the lapping steel bars 7 is not less than 8 times the diameter of the steel bars.

[0038] A construction method for a wall-column structure for 3D printing of buildings includes the following steps:

[0039] Step 1: Construct the concrete structure floor slab 1, and embed embedded steel bars 2 at the positions of the structural columns.

[0040] Step 2: Connect the steel bar sleeve 3 and the embedded steel bar 2 by threads.

[0041] Step 3: Use the special construction equipment for 3D printing to construct the 3D printed exterior wall 4, the 3D printed interior wall 6 and the 3D printed ribs 5 inside the wall, and form column templates at the corners.

[0042] Step 4: Stop the 3D printing construction when it reaches 10 cm below the height of the subsequent lapping steel bars 7.

[0043] Step 5: Connect the lapping steel bars 7 and the steel bar sleeve 3 by threads, and then repeat Step 3.

[0044] Step 6: Stop the 3D printing construction when it reaches the single-story height, insert the assembled structural column steel cage at the structural column, each vertical steel bar of the structural column steel cage contacts the corresponding lapping steel bar 7 respectively, and the bottom of the vertical steel bar contacts and abuts against the top of the steel bar sleeve 3 and the lapping steel bar 7.

[0045] Step 7: Pour and vibrate the cast-in-place column concrete 9, cure it after pouring, and the construction is completed.

Claims

1. A wall-column structure for building 3D printing, characterized in that: It includes a concrete structure bottom plate (1), embedded steel bars (2), steel bar sleeves (3), lapping steel bars (7), a structural column steel bar cage, a 3D printed outer wall (4), a 3D printed inner wall (6), 3D printed inner ribs of the wall (5) and cast-in-place column concrete (9). The structural column steel bar cage includes vertical main steel bars (8) and horizontal steel bars. The 3D printed outer wall (4) and the 3D printed inner wall (6) have the same L-shaped shape. The 3D printed inner wall (6) is located inside the 3D printed outer wall (4). The corners of the 3D printed outer wall (4) and the corners of the 3D printed inner wall (6) and two 3D printed inner ribs of the wall (5) jointly enclose a column formwork for pouring the cast-in-place column concrete (9). The two ends of the 3D printed inner ribs of the wall (5) are respectively fixedly connected to the outside of the 3D printed inner wall (6) and the inside of the 3D printed outer wall (4). A group of embedded steel bars (2) are embedded at the concrete structure bottom plate (1) within the enclosed range of the column formwork. The number of the embedded steel bars (2) is the same as the number of the vertical main steel bars (8). The bottom of the embedded steel bars (2) is buried into the concrete structure bottom plate (1), and the top of the embedded steel bars (2) extends out of the upper side of the concrete structure bottom plate (1). The extended part has an external thread. The steel bar sleeves (3) correspond to the number of the embedded steel bars (2) one by one. The inner wall of the steel bar sleeves (3) has an internal thread. The top of the embedded steel bars (2) extends into the bottom of the steel bar sleeves (3) and is threadedly connected thereto. The bottom of the lapping steel bars (7) has an external thread. The lapping steel bars (7) correspond to the number of the embedded steel bars (2) one by one. The bottom of the lapping steel bars (7) extends into the top of the steel bar sleeves (3) and is threadedly connected. The bottom of the vertical main steel bars (8) is placed on the top end face of the steel bar sleeves (3) and is close to one side of the lapping steel bars (7). The cast-in-place column concrete (9) is poured in the column formwork and wraps the embedded steel bars (2), steel bar sleeves (3), lapping steel bars (7) and the structural column steel bar cage exposed on the upper side of the concrete structure bottom plate (1). The 3D printed outer wall (4), the 3D printed inner wall (6) and the 3D printed inner ribs of the wall (5) are integrally constructed by on-site 3D printing equipment. The steel bar sleeves (3) are steel bar mechanical connection sleeves. The diameter of the lapping steel bars (7) is the same as the diameter of the embedded steel bars (2), and the length of the lapping steel bars (7) is not less than 8 times the steel bar diameter.

2. The wall-column structure for building 3D printing according to claim 1, characterized in that: The materials of the 3D printed outer wall (4), the 3D printed inner wall (6) and the 3D printed inner ribs of the wall (5) are concrete or mortar.

3. The wall-column structure for building 3D printing according to claim 1, characterized in that: The embedded steel bars (2) are fixedly connected to the steel bars of the concrete structure bottom plate (1), and the connection method is welding or binding.

4. The wall-column structure for building 3D printing according to claim 1, characterized in that: The strength grade of the cast-in-place column concrete (9) is C25 - C40.

5. The wall-column structure for 3D printing of buildings according to claim 1, characterized in that: the height of the embedded steel bars (2) exposed from the concrete structural floor slab is 10 cm.

6. A construction method for the wall-column structure for 3D printing of buildings according to any one of claims 1-5, characterized in that it includes the following steps: Step 1, construct the concrete structural floor slab (1), and embed embedded steel bars (2) at the positions of the structural columns; Step 2, connect the steel bar sleeves (3) and the embedded steel bars (2) by threads; Step 3, use special construction equipment for 3D printing to construct the 3D printed exterior wall (4), the 3D printed interior wall (6) and the ribs inside the 3D printed wall (5), and form column formworks at the corners; Step 4, stop the 3D printing construction at a position 10 cm lower than the height of the subsequent lapped steel bars (7); Step 5, connect the lapped steel bars (7) to the steel bar sleeves (3) by threads and then repeat Step 3; Step 6, stop the 3D printing construction when reaching the single-story height, insert the assembled structural column steel cage at the structural column, and each vertical main bar (8) of the structural column steel cage is in contact with the corresponding lapped steel bar (7) respectively, and the bottom of the vertical main bar (8) is in contact with the top of the steel bar sleeve (3) and abuts against the lapped steel bar (7); Step 7, pour and vibrate the cast-in-place column concrete (9), cure after pouring is completed, and the construction is completed.

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