Fabricated building structure

Abstract

The invention relates to the technical field of building structures, and provides an assembly type building structure which comprises a bottom supporting seat, a plurality of vertical assembly assemblies are arranged at the top of the bottom supporting seat, each vertical assembly assembly is composed of two vertically-arranged assembly type concrete slabs, and a vertical supporting column is arranged between the two vertical assembly assemblies; a vertical mounting plate is fixed to one side of the vertical supporting column, the vertical mounting plate and the bottom supporting base are connected through a dismounting mechanism, and a limiting mechanism used for limiting movement of the fabricated concrete slab is arranged in the vertical supporting column. The vertical inner hexagonal rotating block is rotated to replace a traditional bolt fixing mode, so that the transverse limiting column can enter the fabricated concrete slab, sliding of the fabricated concrete slab on the outer side of the vertical supporting column is limited, and the vertical inner hexagonal rotating block is particularly suitable for temporary buildings, modular houses and other scenes needing frequent disassembly and assembly; the labor cost and the time cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and specifically, to a prefabricated building structure. Background Art

[0002] In recent years, prefabricated buildings have been widely used in the construction industry due to their advantages such as fast construction speed, environmental protection and energy conservation, and reusability. The core of prefabricated buildings lies in their modular structure design, especially the rapid installation and disassembly of components such as wall panels and floor slabs, which directly affect the construction efficiency and the recyclability of buildings. However, there are still certain technical defects in the installation of wall panels in existing prefabricated building structures, which affect their actual application effects; Currently, the common installation methods of prefabricated wall panels mainly rely on bolts or screws for fixation. By using the method of pre-buried bolt holes and fastening screws to fix the wall panels to the main frame, a certain degree of stability can be ensured. However, in actual construction, multiple installation holes need to be pre-opened on the wall panels and the frame, and the fixation is completed by tightening the screws one by one. The installation process is cumbersome, consuming a large amount of manpower and time. When disassembling, all the screws must be unscrewed one by one to remove the wall panels, and the operation is extremely inconvenient, which not only reduces the construction efficiency but also increases the difficulty of maintenance and renovation. Summary of the Invention

[0003] The present invention proposes a prefabricated building structure, which solves the problems in the related technologies that multiple installation holes need to be pre-opened on the wall panels and the frame, and the fixation is completed by tightening the screws one by one. The installation process is cumbersome, consuming a large amount of manpower and time. When disassembling, all the screws must be unscrewed one by one to remove the wall panels, and the operation is extremely inconvenient, which not only reduces the construction efficiency but also increases the difficulty of maintenance and renovation.

[0004] The technical solution of the present invention is as follows: A prefabricated building structure includes a bottom support base. A plurality of vertical assembly components are arranged on the top of the bottom support base. The vertical assembly components are composed of two vertically arranged precast concrete slabs. A vertical support column is arranged between the two vertical assembly components. A vertical mounting plate is fixed on one side of the vertical support column. The vertical mounting plate is connected to the bottom support base through a disassembly mechanism. A limiting mechanism for restricting the movement of the precast concrete slab is arranged inside the vertical support column.

[0005] Further, a vertical limiting column is slidably connected inside the precast concrete slab. The precast concrete slab is slidably connected to the vertical support column. The vertical limiting column is placed on the top of the bottom support base.

[0006] Further, a rectangular through groove is opened inside the precast concrete slab. The vertical limiting column is located inside the rectangular through groove and is slidably connected to the precast concrete slab through the rectangular through groove.

[0007] Further, the disassembly mechanism includes a longitudinal rotating column, the inside of the bottom support base is slidably connected with the longitudinal rotating column, one end of the longitudinal rotating column is fixed with a longitudinal threaded rod, the end of the longitudinal rotating column far from the longitudinal threaded rod is fixed with a longitudinal internal hexagonal block, a transverse threaded groove is opened in the inside of the bottom support base, and the bottom support base and the longitudinal threaded rod are threadedly connected through the transverse threaded groove.

[0008] Further, a rectangular slot adapted to the vertical mounting plate is also opened in the inside of the bottom support base, the vertical mounting plate is located inside the rectangular slot and is slidably connected with the bottom support base through the rectangular slot.

[0009] Further, a circular through hole is also opened in the inside of the vertical mounting plate, the longitudinal rotating column is located inside the circular through hole and is slidably connected with the vertical mounting plate through the circular through hole.

[0010] Further, the limiting mechanism includes a vertical internal hexagonal rotating block, the inside of the vertical support column is rotatably connected with the vertical internal hexagonal rotating block, the bottom of the vertical internal hexagonal rotating block is fixed with a vertical rotating shaft, the vertical rotating shaft penetrates through the inside of the vertical support column and is rotatably connected with the vertical support column through a bearing, both ends of the top and bottom of the vertical support column are provided with slidable transverse sliding columns, a plurality of transverse limiting columns are uniformly fixed at one end of the transverse sliding column far from the vertical rotating shaft, and moving components for moving two transverse sliding columns at the same height are arranged at the top and bottom of the vertical rotating shaft.

[0011] Further, dovetail sliders are fixed at both ends of the vertical support column, dovetail chutes adapted to the dovetail sliders are opened in the inside of the precast concrete slab, and the vertical support column and the precast concrete slab are slidably connected through the cooperation of the dovetail sliders and the dovetail chutes.

[0012] Further, the moving components include a first vertical threaded pipe and a second vertical threaded pipe, the first vertical threaded pipe is located at the top of the second vertical threaded pipe, both the first vertical threaded pipe and the second vertical threaded pipe are sleeved outside the vertical rotating shaft and are fixedly connected with the vertical rotating shaft, the spiral directions of the first vertical threaded pipe and the second vertical threaded pipe are opposite, transverse connecting blocks are threadedly connected to the outside of both the first vertical threaded pipe and the second vertical threaded pipe, one end of the transverse connecting block close to the transverse sliding column is rotatably connected with an inclined rotating column through a pin shaft, and one end of the inclined rotating column close to the transverse sliding column is rotatably connected with the transverse sliding column through a pin shaft.

[0013] Further, a transverse through hole is opened in the inside of the vertical support column, the transverse limiting column is located inside the transverse through hole and is slidably connected with the vertical support column through the transverse through hole; The interior of the prefabricated concrete slab is provided with circular limiting holes, and the horizontal limiting column and the prefabricated concrete slab are in clearance fit through the circular limiting holes.

[0014] The working principle and beneficial effects of the present invention are as follows: 1. In the present invention, by rotating the vertical internal hexagonal rotating block, the traditional bolt fixing method is replaced, so that the horizontal limiting column can enter the interior of the prefabricated concrete slab, thereby restricting the sliding of the prefabricated concrete slab outside the vertical support column. The disassembly of the prefabricated concrete slab can be completed only by simple operation, without removing screws one by one, which is especially suitable for scenarios that need to be frequently disassembled and assembled, such as temporary buildings and modular houses, reducing labor costs and time costs.

[0015] 2. In the present invention, through the setting of the disassembly mechanism, the vertical installation plate and the bottom support seat can be conveniently disassembled. While optimizing the convenience of assembly and disassembly, through the setting of the vertical limiting column, the connection strength and stability between two vertically arranged prefabricated concrete slabs are improved, meeting the mechanical property requirements such as building earthquake resistance and wind pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0017] Figure 1 is a schematic structural diagram of the whole of the present invention; Figure 2 is a schematic structural diagram of the vertical support column and the prefabricated concrete slab of the present invention; Figure 3 is an exploded structural diagram of the whole of the present invention; Figure 4 is a schematic structural diagram of the interior of the prefabricated concrete slab of the present invention; Figure 5 is a schematic structural diagram of the interior of the bottom support seat of the present invention; Figure 6 is a schematic structural diagram of the interior of the vertical support column of the present invention; Figure 7 is a schematic structural diagram of the first vertical threaded pipe and the second vertical threaded pipe of the present invention.

[0018] In the figure: 1. Bottom support seat; 2. Vertical support column; 3. Prefabricated concrete slab; 4. Vertical installation plate; 5. Vertical limiting column; 6. Longitudinal rotating column; 7. Longitudinal internal hexagonal block; 8. Longitudinal threaded rod; 9. Vertical internal hexagonal rotating block; 10. Vertical rotating shaft; 11. Horizontal sliding column; 12. Horizontal limiting column; 13. First vertical threaded pipe; 14. Second vertical threaded pipe; 15. Horizontal connecting block; 16. Oblique rotating column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0020] Embodiment 1 As Figures 1 to 5 shown, this embodiment proposes an assembled building structure; In this embodiment, an assembled building structure includes a bottom support base 1. A plurality of vertical assembly components are arranged on the top of the bottom support base 1. The vertical assembly components are composed of two vertically arranged precast concrete slabs 3. A vertical support column 2 is arranged between the two vertical assembly components. A vertical mounting plate 4 is fixed on one side of the vertical support column 2. The vertical mounting plate 4 and the bottom support base 1 are connected by a disassembly mechanism. A limiting mechanism for restricting the movement of the precast concrete slab 3 is arranged inside the vertical support column 2; A vertical limiting column 5 is slidably connected inside the precast concrete slab 3. The precast concrete slab 3 is slidably connected with the vertical support column 2. The vertical limiting column 5 is placed on the top of the bottom support base 1. Through the arrangement of the vertical limiting column 5, the two vertically arranged precast concrete slabs 3 can be installed outside the vertical limiting column 5, and thus the assembly of the two precast concrete slabs 3 can be more accurate; A rectangular through groove is opened inside the precast concrete slab 3. The vertical limiting column 5 is located inside the rectangular through groove and is slidably connected with the precast concrete slab 3 through the rectangular through groove. Through the arrangement of the rectangular through groove, the precast concrete slab 3 can slide vertically outside the vertical limiting column 5; The disassembly mechanism includes a longitudinal rotating column 6. The longitudinal rotating column 6 is slidably connected inside the bottom support base 1. One end of the longitudinal rotating column 6 is fixed with a longitudinal threaded rod 8. The end of the longitudinal rotating column 6 far from the longitudinal threaded rod 8 is fixed with a longitudinal internal hexagonal block 7. A transverse threaded groove is opened inside the bottom support base 1. The bottom support base 1 and the longitudinal threaded rod 8 are threadedly connected through the transverse threaded groove. Through the arrangement of the transverse spiral groove, the longitudinal threaded rod 8 can be rotated into the inside of the bottom support base 1, and thus the longitudinal rotating column 6 can be installed inside the bottom support base 1; A rectangular slot adapted to the vertical mounting plate 4 is also opened inside the bottom support base 1. The vertical mounting plate 4 is located inside the rectangular slot and is slidably connected with the bottom support base 1 through the rectangular slot, so that the vertical mounting plate 4 can slide inside the bottom support base 1; A circular through-hole is also formed inside the vertical mounting plate 4. The longitudinal rotating column 6 is located inside the circular through-hole and is slidably connected to the vertical mounting plate 4 through the circular through-hole. Through the setting of the circular through-hole, the longitudinal rotating column 6 can be inserted into the vertical mounting plate 4, thereby restricting the vertical sliding of the vertical mounting plate 4 inside the bottom support base 1, enabling the vertical mounting plate 4 to be installed inside the bottom support base 1.

[0021] Here, move the precast concrete slab 3 to the outside of the vertical support column 2. Through the sliding connection between the vertical support column 2 and the precast concrete slab 3, the precast concrete slab 3 can fall onto the top of the bottom support base 1, and then the vertical mounting plate 4 can be inserted into the bottom support base 1. Then insert the vertical limit post 5 into the precast concrete slab 3. Due to the gravity of the vertical limit post 5, the vertical mounting plate 4 can fall onto the top of the bottom support base 1. Through the setting of the vertical limit post 5, the two vertically placed precast concrete slabs 3 can be supported, improving the stability between the two vertically placed precast concrete slabs 3. Then use a hex wrench to rotate the longitudinal internal hexagon block 7. The rotation of the longitudinal internal hexagon block 7 enables the longitudinal threaded rod 8 to be threadedly connected to the bottom support base 1, and then the longitudinal rotating column 6 can enter the vertical mounting plate 4, enabling the vertical mounting plate 4 to be installed inside the bottom support base 1. Similarly, after rotating the longitudinal threaded rod 8 out of the bottom support base 1, the restriction on the vertical mounting plate 4 can be released, enabling the precast concrete slab 3 and the vertical mounting plate 4 to be disassembled.

[0022] Through the setting of the disassembly mechanism, the vertical mounting plate 4 and the bottom support base 1 can be conveniently disassembled. While optimizing the disassembly and assembly convenience, through the setting of the vertical limit post 5, the connection strength and stability between the two vertically arranged precast concrete slabs 3 are improved, meeting the mechanical performance requirements such as earthquake resistance and wind pressure resistance of the building.

[0023] Embodiment 2 As Figures 6 to 7 shown, based on the same concept as the above Embodiment 1, this embodiment also proposes a limiting mechanism; In this embodiment, the limiting mechanism includes a vertical internal hexagon rotating block 9. The vertical internal hexagon rotating block 9 is rotatably connected inside the vertical support column 2. A vertical rotating shaft 10 is fixed to the bottom of the vertical internal hexagon rotating block 9. The vertical rotating shaft 10 penetrates through the vertical support column 2 and is rotatably connected to the vertical support column 2 through a bearing. Slidable transverse sliding columns 11 are provided at both ends of the top and bottom of the vertical support column 2. A plurality of transverse limit posts 12 are evenly fixed to the ends of the transverse sliding columns 11 away from the vertical rotating shaft 10. Moving components for moving the two transverse sliding columns 11 at the same height are provided at the top and bottom of the vertical rotating shaft 10; Both ends of the vertical support column 2 are fixed with dovetail sliders. A dovetail chute adapted to the dovetail slider is provided inside the precast concrete slab 3. The vertical support column 2 is slidably connected to the precast concrete slab 3 through the cooperation of the dovetail slider and the dovetail chute. Through the setting of the dovetail slider and the dovetail chute, the precast concrete slab 3 can slide outside the vertical support column 2, and the movement of the precast concrete slab 3 at one end of the vertical support column 2 can be restricted. The moving component includes a first vertical threaded pipe 13 and a second vertical threaded pipe 14. The first vertical threaded pipe 13 is located at the top of the second vertical threaded pipe 14. Both the first vertical threaded pipe 13 and the second vertical threaded pipe 14 are sleeved outside the vertical rotating shaft 10 and fixedly connected to the vertical rotating shaft 10. The spiral directions of the first vertical threaded pipe 13 and the second vertical threaded pipe 14 are opposite. Transverse connection blocks 15 are threadedly connected to the outside of both the first vertical threaded pipe 13 and the second vertical threaded pipe 14. One end of the transverse connection block 15 close to the transverse sliding column 11 is rotatably connected to an inclined rotating column 16 through a pin shaft. One end of the inclined rotating column 16 close to the transverse sliding column 11 is rotatably connected to the transverse sliding column 11 through a pin shaft. A transverse through hole is provided inside the vertical support column 2. The transverse limiting column 12 is located inside the transverse through hole and is slidably connected to the vertical support column 2 through the transverse through hole, so that the transverse limiting column 12 can move inside the vertical support column 2, and then the transverse limiting column 12 can move out of the inside of the vertical support column 2 and enter the inside of the precast concrete slab 3. A circular limiting hole is provided inside the precast concrete slab 3. The transverse limiting column 12 and the precast concrete slab 3 are in clearance fit through the circular limiting hole. Through the setting of the circular limiting hole, the transverse limiting column 12 can enter the inside of the precast concrete slab 3, and then the vertical sliding of the precast concrete slab 3 outside the vertical support column 2 can be restricted. Here, a hexagonal wrench is used to enable the vertical internal hexagonal rotating block 9 to rotate inside the vertical support column 2, thereby enabling the vertical rotating shaft 10 to rotate inside the vertical support column 2. The rotation of the vertical rotating shaft 10 causes the first vertical threaded pipe 13 and the second vertical threaded pipe 14 to rotate. The rotation of the first vertical threaded pipe 13 and the second vertical threaded pipe 14 enables the two horizontal connecting blocks 15 to move, and the moving directions of the two horizontal connecting blocks 15 are opposite. The movement of the two horizontal connecting blocks 15 causes the horizontal sliding column 11 to move inside the vertical support column 2 through the inclined rotating column 16, thereby enabling the horizontal sliding column 11 to move towards the precast concrete slab 3, and further enabling the horizontal limiting column 12 to move into the precast concrete slab 3, restricting the vertical sliding of the precast concrete slab 3 outside the vertical support column 2, enabling the precast concrete slab 3 to be installed outside the vertical support column 2. Through the setting of the vertical support column 2, the precast concrete slab 3 can be modularly installed outside the vertical support column 2, improving the installation efficiency.

[0024] By rotating the vertical internal hexagonal rotating block 9, replacing the traditional bolt fixing method, the horizontal limiting column 12 can enter the precast concrete slab 3, thereby restricting the sliding of the precast concrete slab 3 outside the vertical support column 2. The disassembly of the precast concrete slab 3 can be completed with only simple operations, without having to remove screws one by one, which is particularly suitable for scenarios such as temporary buildings and modular houses that require frequent disassembly and assembly, reducing labor costs and time costs.

[0025] During operation, the precast concrete slab 3 is moved to the outside of the vertical support column 2. Through the sliding connection between the vertical support column 2 and the precast concrete slab 3, the precast concrete slab 3 can fall onto the top of the bottom support base 1, thereby enabling the vertical mounting plate 4 to be inserted into the inside of the bottom support base 1. Then, the vertical limiting column 5 is inserted into the precast concrete slab 3. Due to the gravity of the vertical limiting column 5, the vertical mounting plate 4 can fall onto the top of the bottom support base 1. Through the setting of the vertical limiting column 5, the two vertically placed precast concrete slabs 3 can be supported, improving the stability between the two vertically placed precast concrete slabs 3. Then, a hexagonal wrench is used to enable the longitudinal internal hexagonal block 7 to rotate. The rotation of the longitudinal internal hexagonal block 7 causes the longitudinal threaded rod 8 to be threadedly connected to the bottom support base 1, thereby enabling the longitudinal rotating column 6 to enter the inside of the vertical mounting plate 4, and further enabling the vertical mounting plate 4 to be installed inside the bottom support base 1. Similarly, after the longitudinal threaded rod 8 is rotated out of the inside of the bottom support base 1, the restriction on the vertical mounting plate 4 can be released, enabling the precast concrete slab 3 and the vertical mounting plate 4 to be disassembled; Use a hex wrench to enable the vertical internal hexagon rotating block 9 to rotate inside the vertical support column 2, thereby enabling the vertical rotating shaft 10 to rotate inside the vertical support column 2. The rotation of the vertical rotating shaft 10 enables the first vertical threaded pipe 13 and the second vertical threaded pipe 14 to rotate. The rotation of the first vertical threaded pipe 13 and the second vertical threaded pipe 14 enables the two transverse connecting blocks 15 to move, and the moving directions of the two transverse connecting blocks 15 are opposite. The movement of the two transverse connecting blocks 15 enables the transverse sliding column 11 to move inside the vertical support column 2 through the inclined rotating column 16, thereby enabling the transverse sliding column 11 to move towards the direction of the precast concrete slab 3, and further enabling the transverse limiting column 12 to move into the precast concrete slab 3, enabling the first vertical threaded pipe 13 to limit the vertical sliding of the precast concrete slab 3 outside the vertical support column 2, enabling the precast concrete slab 3 to be installed outside the vertical support column 2. Through the setting of the vertical support column 2, the precast concrete slab 3 can be modularly installed outside the vertical support column 2, improving the installation efficiency.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An assembled building structure, characterized in that, It includes a bottom support base (1). A plurality of vertical assembly components are arranged on the top of the bottom support base (1). The vertical assembly components are composed of two vertically arranged precast concrete slabs (3). A vertical support column (2) is arranged between the two vertical assembly components. A vertical mounting plate (4) is fixed on one side of the vertical support column (2). The vertical mounting plate (4) and the bottom support base (1) are connected by a disassembly mechanism. A limiting mechanism for restricting the movement of the precast concrete slab (3) is arranged inside the vertical support column (2).

2. The prefabricated building structure according to claim 1, characterized in that A vertical limiting column (5) is slidably connected inside the precast concrete slab (3). The precast concrete slab (3) is slidably connected with the vertical support column (2). The vertical limiting column (5) is placed on the top of the bottom support base (1).

3. The prefabricated building structure according to claim 2, characterized in that, A rectangular through groove is formed inside the precast concrete slab (3). The vertical limiting column (5) is located inside the rectangular through groove and is slidably connected with the precast concrete slab (3) through the rectangular through groove.

4. A prefabricated building structure according to claim 1, wherein, The disassembly mechanism includes a longitudinal rotating column (6). The longitudinal rotating column (6) is slidably connected inside the bottom support base (1). A longitudinal threaded rod (8) is fixed at one end of the longitudinal rotating column (6). A longitudinal internal hexagonal block (7) is fixed at the end of the longitudinal rotating column (6) away from the longitudinal threaded rod (8). A transverse threaded groove is formed inside the bottom support base (1). The bottom support base (1) and the longitudinal threaded rod (8) are threadedly connected through the transverse threaded groove.

5. An assembled building structure according to claim 4, characterized in that, A rectangular slot adapted to the vertical mounting plate (4) is further formed inside the bottom support base (1). The vertical mounting plate (4) is located inside the rectangular slot and is slidably connected with the bottom support base (1) through the rectangular slot.

6. The prefabricated building structure according to claim 4, characterized in that, A circular through hole is further formed inside the vertical mounting plate (4). The longitudinal rotating column (6) is located inside the circular through hole and is slidably connected with the vertical mounting plate (4) through the circular through hole.

7. An assembled building structure according to claim 4, characterized in that, The limiting mechanism includes a vertical internal hexagonal rotating block (9). The vertical internal hexagonal rotating block (9) is rotatably connected inside the vertical support column (2). A vertical rotating shaft (10) is fixed at the bottom of the vertical internal hexagonal rotating block (9). The vertical rotating shaft (10) penetrates through the inside of the vertical support column (2) and is rotatably connected with the vertical support column (2) through a bearing. Slidable transverse sliding columns (11) are arranged at both ends of the top and bottom of the vertical support column (2). A plurality of transverse limiting columns (12) are uniformly fixed at the ends of the transverse sliding columns (11) away from the vertical rotating shaft (10). Moving components for moving the two transverse sliding columns (11) at the same height are arranged at the top and bottom of the vertical rotating shaft (10).

8. An assembled building structure according to claim 7, characterized in that, Dovetail sliders are fixed at both ends of the vertical support column (2). A dovetail chute adapted to the dovetail slider is formed inside the precast concrete slab (3). The vertical support column (2) and the precast concrete slab (3) are slidably connected through the cooperation of the dovetail slider and the dovetail chute.

9. A prefabricated building structure according to claim 7, characterized in that, The moving component includes a first vertical threaded pipe (13) and a second vertical threaded pipe (14). The first vertical threaded pipe (13) is located at the top of the second vertical threaded pipe (14). Both the first vertical threaded pipe (13) and the second vertical threaded pipe (14) are sleeved outside the vertical rotating shaft (10) and fixedly connected to the vertical rotating shaft (10). The spiral directions of the first vertical threaded pipe (13) and the second vertical threaded pipe (14) are opposite. Transverse connecting blocks (15) are threadedly connected to the outside of both the first vertical threaded pipe (13) and the second vertical threaded pipe (14). One end of the transverse connecting block (15) close to the transverse sliding column (11) is rotatably connected to an inclined rotating column (16) through a pin shaft. One end of the inclined rotating column (16) close to the transverse sliding column (11) is rotatably connected to the transverse sliding column (11) through a pin shaft.

10. A prefabricated building structure according to claim 9, characterized in that, A transverse through hole is formed inside the vertical support column (2). The transverse limiting column (12) is located inside the transverse through hole and is slidably connected to the vertical support column (2) through the transverse through hole; A circular limiting hole is formed inside the precast concrete slab (3). The transverse limiting column (12) and the precast concrete slab (3) are in clearance fit through the circular limiting hole.

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