A wall column structure for on-site 3D printing and its construction method

Abstract

A wall column structure for on-site 3D printing and its construction method, including a concrete structural floor slab, embedded steel bars, lintel beams for openings, structural column steel reinforcement cages, 3D printed exterior walls, 3D printed interior walls, 3D printed internal ribs of the wall, and cast-in-place column concrete. The present invention uses special 3D printing equipment for the construction of 3D printed walls. After installing the structural column steel reinforcement cages through reserved holes, 3D printed precast components for the openings are used for sealing, and finally cast-in-place concrete is poured to form an integral structure between the structural columns and the 3D printed walls. 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 present invention belongs to the field of building construction, and particularly relates to a wall-column structure for on-site 3D printing and its construction method. Background Art

[0002] The 3D printing equipment for concrete mortar cannot perform on-site printing construction around the steel reinforcement cages that have been constructed. Therefore, currently, most 3D printed buildings adopt the form of producing 3D printed precast components in factories 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 present invention is to provide a wall-column structure for on-site 3D printing and its construction method, aiming to solve the problems that existing 3D printing equipment cannot perform on-site printing construction around the steel reinforcement cages that have been constructed and can only adopt assembly joints, resulting in high building costs, affecting construction quality, poor integrity of the structural columns in the on-site 3D printed building construction, and low structural safety.

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

[0005] A wall-column structure for on-site 3D printing, comprising a concrete structural floor slab, embedded steel bars, lintel beams for openings, a structural column steel reinforcement cage, a 3D printed outer wall, a 3D printed inner wall, internal ribs of the 3D printed 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 the two internal ribs of the 3D printed wall jointly enclose a column formwork for pouring the cast-in-place column concrete. The two ends of the internal ribs of the 3D printed 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] The 3D printed inner wall includes a bottom reserved hole and a precast plug for the hole. The bottom reserved hole is formed by the two side walls truncated at the bottom corner of the 3D printed inner wall and the L-shaped lintel beam for the opening whose two ends are placed on the upper sides of the two side walls at the truncated part. The thickness of the L-shaped lintel beam for the opening is equal to the thickness of each layer of the 3D printed inner wall, and the width of the L-shaped lintel beam for the opening is equal to the thickness of the 3D printed inner wall.

[0008] The size of the prefabricated hole plugging block is adapted to the size of the reserved hole at the bottom. The splicing joints between the periphery of the prefabricated hole plugging block and the reserved hole at the bottom are bonded by a grouting material.

[0009] A group of embedded steel bars are pre-embedded at the concrete structure floor slab at the position enclosed by the column formwork. The number of the embedded steel bars is the same as the number of the vertical main steel bars. The bottom of the embedded steel bars is buried into the concrete structure floor slab, and the top of the embedded steel bars protrudes from the upper side of the concrete structure floor slab.

[0010] The bottom of the vertical main steel bars is placed on the upper side of the concrete structure floor slab and fixedly connected to one side of the embedded steel bars. Cast-in-place column concrete is poured in the column formwork and wraps the embedded steel bars and the structural column reinforcement cage exposed on the upper side of the concrete structure floor slab.

[0011] The height of the reserved hole at the bottom is higher than the height of the top of the embedded steel bars protruding from the upper side of the concrete structure floor slab, and the height of the reserved hole at the bottom is 40 cm.

[0012] The materials of the 3D printed exterior wall, the 3D printed interior wall and the 3D printed internal ribs of the wall are concrete or mortar.

[0013] The 3D printed exterior wall, the 3D printed interior wall and the 3D printed internal ribs of the wall are integrally constructed by on-site 3D printing equipment.

[0014] The bottom of the embedded steel bars is buried into the concrete structure floor slab and fixedly connected to the steel bars of the concrete structure floor slab. The connection method is welding or binding. The height of the top of the embedded steel bars protruding from the concrete structure floor slab is 20 cm.

[0015] The grouting material is cement mortar.

[0016] The strength grade of the cast-in-place column concrete is C25 - C40.

[0017] The inner ends of the 3D printed internal ribs of the wall are fixedly connected to the ends of the 3D printed interior walls on both sides at the reserved hole at the bottom.

[0018] The diameter of the vertical main steel bars is the same as the diameter of the embedded steel bars, and the lap length is not less than 8 times the diameter of the steel bars.

[0019] A construction method for a wall-column structure printed on-site by 3D printing includes the following steps:

[0020] Step 1, construct the concrete structure floor slab, and pre-embed embedded steel bars at the position of the structural column;

[0021] Step 2: Use special construction equipment for 3D printing to construct the 3D printed exterior wall, 3D printed interior wall, and 3D printed internal ribs of the wall, forming column formwork at the corners; among them, when 3D printing the interior wall, reserve a bottom hole at the lower layer;

[0022] Step 3: Support an L-shaped lintel over the bottom reserved hole. Place the two ends of the L-shaped lintel on the walls on both sides of the bottom reserved hole, and use a lintel support to temporarily vertically support the center of the bottom of the L-shaped lintel;

[0023] Step 4: Stop the 3D printing construction when it reaches the single-story height, and wait until the wall strength meets the requirements;

[0024] Step 5: Remove the lintel support and insert the assembled structural column steel reinforcement cage. Each vertical main reinforcement of the steel reinforcement cage contacts the embedded steel bars respectively, and the bottom of the steel reinforcement cage contacts the concrete structure floor slab;

[0025] Step 6: Weld the structural column steel reinforcement cage and the embedded steel bars firmly through the bottom reserved hole;

[0026] Step 7: Use special construction equipment for 3D printing to make precast plug blocks for the hole and place them into the bottom reserved hole. Seal the joint with grouting material;

[0027] Step 8: Pour and vibrate the cast-in-place column concrete, cure after pouring, and the construction is completed.

[0028] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0029] The present invention uses special equipment for 3D printing to construct the 3D printed wall. After installing the structural column steel reinforcement cage through the reserved hole, use 3D printed precast components for the hole to seal it, and finally pour the cast-in-place concrete, so that the structural column and the 3D printed wall form an integral structure. 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.

[0030] The construction method of the present invention uses the on-site constructed 3D printed wall as the formwork for the building structural column and reserves the operation space for the construction of the structural column steel bars, realizing the integrity of the building structural column and the 3D printed wall. Therefore, the on-site 3D printed structural column has the characteristics of formwork-free, high construction efficiency, and intelligent construction, ensuring the integrity of the building, ensuring the construction quality, and reducing the construction cost. It improves the structural stability of on-site 3D printed building technology and ensures the construction quality. Description of the Drawings

[0031] The following further describes the present invention in detail with reference to the drawings.

[0032] Figure 1 It is a schematic structural diagram of the present invention and a schematic diagram of the completion of Step 8 in the construction method.

[0033] Figure 2 It is a schematic diagram of the completion of Step 2 in the construction method.

[0034] Figure 3 It is a schematic diagram of the completion of Step 3 in the construction method.

[0035] Figure 4 It is a schematic diagram of the construction process of Step 4 in the construction method.

[0036] Figure 5 It is a schematic diagram of the completion of Step 5 in the construction method.

[0037] Figure 6 It is an enlarged bottom schematic diagram of the completion of Step 6 in the construction method.

[0038] Figure 7 It is a schematic diagram of the construction process of Step 7 in the construction method.

[0039] Reference numerals: 1 - Concrete structure floor slab, 2 - 3D printed outer wall, 3 - Embedded steel bars, 4 - 3D printed inner ribs of the wall, 5 - 3D printed inner wall, 6 - L-shaped opening lintel, 7 - Lintel support, 8 - Vertical main reinforcement, 9 - Prefabricated hole plugging block, 10 - Cast-in-place column concrete, 11 - Splice joint. Detailed implementation manners

[0040] See Figures 1-7 As shown, a wall-column structure printed on-site includes a concrete structure floor slab 1, embedded steel bars 3, an opening lintel 6, a structural column reinforcement cage, a 3D printed outer wall 2, a 3D printed inner wall 5, 3D printed inner ribs 4 of the wall, and cast-in-place column concrete 10. The structural column reinforcement cage includes vertical main reinforcement 8 and horizontal steel bars.

[0041] The 3D printed outer wall 2 and the 3D printed inner wall 5 have the same L-shaped shape. The 3D printed inner wall 5 is located inside the 3D printed outer wall 2. The corners of the 3D printed outer wall 2, the corners of the 3D printed inner wall 5, and the two 3D printed inner ribs 4 of the wall jointly enclose a column formwork for pouring the cast-in-place column concrete 10. The two ends of the 3D printed inner ribs 4 of the wall are respectively fixedly connected to the outer side of the 3D printed inner wall 5 and the inner side of the 3D printed outer wall 2.

[0042] The 3D printed internal wall 5 includes a bottom reserved hole and a prefabricated hole plugging block 9. The bottom reserved hole is formed by the two side walls truncated at the bottom corners of the 3D printed internal wall 5 and the L-shaped hole lintel 6 with both ends placed on the upper sides of the two side walls at the truncated positions. The thickness of the L-shaped hole lintel 6 is equal to the thickness of each layer of the 3D printed internal wall 5, and the width of the L-shaped hole lintel 6 is equal to the thickness of the 3D printed internal wall 5.

[0043] The size of the prefabricated hole plugging block 9 is adapted to the size of the bottom reserved hole, and the splicing seam 11 between the periphery of the prefabricated hole plugging block 9 and the bottom reserved hole is bonded by a grouting material.

[0044] A group of embedded steel bars 3 are embedded at the concrete structure floor slab 1 within the range enclosed by the column formwork. The number of the embedded steel bars 3 is the same as the number of the vertical main steel bars 8. The bottom of the embedded steel bars 3 is buried in the concrete structure floor slab 1, and the top of the embedded steel bars 3 protrudes from the upper side of the concrete structure floor slab 1.

[0045] The bottom of the vertical main steel bar 8 is placed on the upper side of the concrete structure floor slab 1 and fixedly connected to one side of the embedded steel bar 3. The cast-in-place column concrete 10 is poured within the column formwork and wraps the embedded steel bars 3 and the structural column steel reinforcement cage exposed on the upper side of the concrete structure floor slab 1.

[0046] The height of the bottom reserved hole is higher than the height of the top of the embedded steel bar protruding from the upper side of the concrete structure floor slab 1, and the height of the bottom reserved hole is 40 cm.

[0047] The materials of the 3D printed external wall 2, the 3D printed internal wall 5, and the 3D printed internal rib 4 of the wall are concrete or mortar.

[0048] The 3D printed external wall 2, the 3D printed internal wall 5, and the 3D printed internal rib 4 of the wall are integrally constructed by on-site 3D printing equipment.

[0049] The bottom of the embedded steel bar 3 is buried in the concrete structure floor slab 1 and fixedly connected to the steel bars of the concrete structure floor slab 1. The connection method is welding or binding, and the height of the top of the embedded steel bar 3 protruding from the concrete structure floor slab 1 is 20 cm.

[0050] The grouting material is cement mortar. The strength grade of the cast-in-place column concrete 10 is C25 - C40. The inner end of the 3D printed internal rib 4 of the wall is fixedly connected to the ends of the 3D printed internal walls 5 on both sides at the bottom reserved hole. The diameter of the vertical main steel bar 8 is the same as the diameter of the embedded steel bar 3, and the lap length is not less than 8 times the diameter of the steel bar.

[0051] A construction method for a wall-column structure printed on-site by 3D includes the following steps:

[0052] Step 1: Construct the concrete structure floor slab 1, and embed embedded steel bars 3 at the positions of the structural columns.

[0053] Step 2: Use special 3D printing construction equipment to construct the 3D printed exterior wall 2, the 3D printed interior wall 5, and the 3D printed ribs 4 inside the wall, and form column formworks at the corners; among them, when 3D printing the interior wall 5, reserve bottom holes at the lower layer. See Figure 2 as shown.

[0054] Step 3: Support an L-shaped lintel 6 on the bottom reserved holes. The two ends of the L-shaped lintel 6 are placed on the walls on both sides of the bottom reserved holes, and the center of the bottom of the L-shaped lintel 6 is temporarily vertically supported by a lintel support 7. See Figure 3 as shown.

[0055] Step 4: Stop 3D printing construction when it reaches the single-story height, and wait for the wall strength to meet the requirements. See Figure 4 as shown.

[0056] Step 5: Remove the lintel support 7, and insert the assembled structural column reinforcement cage. Each vertical main reinforcement 8 of the reinforcement cage is in contact with the embedded steel bars 2 respectively, and the bottom of the reinforcement cage is in contact with the concrete structure floor slab. See Figure 5 as shown.

[0057] Step 6: Weld the structural column reinforcement cage and the embedded steel bars firmly through the bottom reserved holes. See Figure 6 as shown.

[0058] Step 7: Use special 3D printing construction equipment to make hole precast plugging blocks 9, and place them into the bottom reserved holes. The splicing joints are sealed with grouting materials. See Figure 7 as shown.

[0059] Step 8: Pour the cast-in-place column concrete 10 and vibrate it. After pouring, cure it, and the construction is completed. See Figure 1 as shown.

Claims

1. A wall column structure for on-site 3D printing, characterized in that: It includes a concrete structural floor slab (1), embedded steel bars (3), lintel beams for openings (6), the steel reinforcement cage of a structural column, a 3D printed exterior wall (2), a 3D printed interior wall (5), 3D printed inner ribs of the wall (4), and cast-in-place column concrete (10). The steel reinforcement cage of the structural column includes vertical main steel bars (8) and horizontal steel bars. The 3D printed exterior wall (2) and the 3D printed interior wall (5) have the same L-shaped form. The 3D printed interior wall (5) is located inside the 3D printed exterior wall (2). The corners of the 3D printed exterior wall (2), the corners of the 3D printed interior wall (5), and the two 3D printed inner ribs of the wall (4) jointly enclose a column formwork for pouring the cast-in-place column concrete (10). The two ends of the 3D printed inner ribs of the wall (4) are respectively fixedly connected to the outside of the 3D printed interior wall (5) and the inside of the 3D printed exterior wall (2). The 3D printed interior wall (5) includes a bottom reserved hole and a precast plug (9) for the hole. The bottom reserved hole is formed by the two side walls truncated at the bottom corner of the 3D printed interior wall (5) and an L-shaped lintel beam for the opening (6) with both ends placed on the upper sides of the two side walls at the truncated part. The thickness of the L-shaped lintel beam for the opening (6) is equal to the thickness of each layer of the 3D printed interior wall (5), and the width of the L-shaped lintel beam for the opening (6) is equal to the thickness of the 3D printed interior wall (5). The size of the precast plug (9) for the hole is adapted to the size of the bottom reserved hole. The splicing joint (11) between the periphery of the precast plug (9) for the hole and the bottom reserved hole is bonded with a grouting material. A group of embedded steel bars (3) are embedded at the concrete structural floor slab (1) within the enclosed range of the column formwork. The number of the embedded steel bars (3) is the same as the number of the vertical main steel bars (8). The bottom of the embedded steel bars (3) is buried into the concrete structural floor slab (1), and the top of the embedded steel bars (3) extends out of the upper side of the concrete structural floor slab (1). The bottom of the vertical main steel bars (8) is placed on the upper side of the concrete structural floor slab (1) and fixedly connected to one side of the embedded steel bars (3). Cast-in-place column concrete (10) is poured within the column formwork and wraps the embedded steel bars (3) and the steel reinforcement cage of the structural column that are exposed on the upper side of the concrete structural floor slab (1). The height of the bottom reserved hole is higher than the height of the top of the embedded steel bars extending out of the upper side of the concrete structural floor slab (1). The 3D printed exterior wall (2), the 3D printed interior wall (5), and the 3D printed inner ribs of the wall (4) are integrally constructed by on-site 3D printing equipment. The bottom of the embedded steel bars (3) is buried into the concrete structural floor slab (1) and fixedly connected to the steel bars of the concrete structural floor slab (1). The inner ends of the 3D printed inner ribs of the wall (4) are fixedly connected to the ends of the 3D printed interior wall (5) on both sides at the bottom reserved hole.

2. The wall column structure for on-site 3D printing according to claim 1, characterized in that: The height of the bottom reserved hole is 40 cm.

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

4. The wall column structure for on-site 3D printing according to claim 1, characterized in that: The fixed connection method between the embedded steel bars (3) and the steel bars of the concrete structure floor slab (1) is welding or binding, and the height of the top of the embedded steel bars (3) exposed above the concrete structure floor slab (1) is 20 cm.

5. The on-site 3D printed wall column structure according to claim 1, characterized in that: The grouting material is cement mortar.

6. The wall column structure for on-site 3D printing according to claim 1, characterized in that: The strength grade of the cast-in-place column concrete (10) is C25 - C40.

7. The wall column structure for on-site 3D printing according to claim 1, characterized in that: The diameter of the vertical main steel bars (8) is the same as that of the embedded steel bars (3), and the lap length is not less than 8 times the diameter of the steel bars.

8. A construction method of the wall column structure for on-site 3D printing according to any one of claims 1-7, characterized in that, It includes the following steps: Step 1, construct the concrete structure floor slab (1), and embed embedded steel bars (3) at the positions of the structural columns; Step 2, use the 3D printing special construction equipment to construct the 3D printed exterior wall (2), the 3D printed interior wall (5) and the 3D printed ribs inside the wall (4), and form column templates at the corners; among them, when printing the 3D printed interior wall (5), reserve bottom holes at the lower layer; Step 3, support an L-shaped opening lintel (6) on the bottom reserved holes, place the two ends of the L-shaped opening lintel (6) on the walls on both sides of the bottom reserved holes, and use a lintel support (7) to conduct temporary vertical support at the center of the bottom of the L-shaped opening lintel (6); Step 4, stop the 3D printing construction when it reaches the single-story height, and wait until the strength of the wall meets the requirements; Step 5, remove the lintel support (7), insert the assembled structural column steel cage, each vertical main steel bar (8) of the steel cage contacts the embedded steel bars respectively, and the bottom of the steel cage contacts the concrete structure floor slab; Step 6, weld the structural column steel cage and the embedded steel bars firmly through the bottom reserved holes; Step 7, use the 3D printing special construction equipment to make a hole precast plugging block (9), and place it into the bottom reserved holes, and seal the splicing joints with grouting material; Step 8, pour the cast-in-place column concrete (10) and vibrate it, and cure it after pouring is completed, and the construction is completed.

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