Fabricated ground system

Abstract

The utility model relates to the technical field of ground construction, and discloses an assembly type ground system which comprises a base layer plate, a base layer plate and a base layer plate, the positioning seat is located above the base plate and fixedly connected with the base plate, and a local area of the upper end face of the positioning seat is sunken to form a clamping groove; the panel is positioned above the positioning seat; and the partition piece is fixedly connected with the panel, a clamping block is arranged at the position, corresponding to the clamping groove, of the partition piece, and the clamping block is suitable for being embedded into the clamping groove so that the panel can be detachably connected with the positioning base. According to the assembly type ground system provided by the utility model, the panel falls onto the positioning seat under the action of gravity, the clamping block falls into the clamping groove, at the moment, the relative positions of the positioning seat and the panel are fixed, and the panel can be detached from the positioning seat in a lifting mode, so that the panel and the positioning seat form detachable connection; and the disassembled panel can be reutilized, so that the resource waste is reduced, and the damage to the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ground construction, in particular to an assembled ground system. Background Art

[0002] As an essential component of prefabricated buildings, prefabricated flooring is increasingly being used in the decoration industry. Prefabricated floor systems typically consist of a top-down stone slab surface layer, a mortar bonding layer, and a base layer. However, during renovation or conversion of existing buildings, the removal of the stone surface layer creates construction waste. This means the stone cannot be reused after installation, resulting in a waste of resources and environmental damage. Utility Model Content

[0003] In view of this, the present invention provides an assembled floor system to solve the problem that after the stone surface layer is removed, construction waste is formed, which cannot be reused, resulting in a waste of resources and damage to the environment.

[0004] The utility model provides an assembled floor system, comprising:

[0005] Baseboard;

[0006] The positioning seat is located above the base plate and is fixedly connected to the base plate. A local area on the upper end surface of the positioning seat is recessed to form a snap-in groove;

[0007] A panel is located above the positioning seat;

[0008] The separator is fixedly connected to the panel. A clamping block is provided at a position of the separator corresponding to the clamping groove. The clamping block is suitable for being embedded in the clamping groove to form a detachable connection between the panel and the positioning seat.

[0009] Beneficial effect: The panel falls on the positioning seat under the action of gravity, and the clamping block falls into the clamping groove. At this time, the relative position of the positioning seat and the panel is fixed. The panel can be removed from the positioning seat by being lifted, so that the panel and the positioning seat form a detachable connection, and the removed panel can be reused, which is conducive to reducing resource waste and reducing damage to the environment.

[0010] In an optional embodiment, the assembled floor system further includes a floor heating module, which is fixedly disposed between the base plate and the positioning seat.

[0011] In an optional embodiment, a glue injection hole is opened on the positioning seat, the glue injection hole passes through the positioning seat, the glue injection hole is filled with adhesive, and the positioning seat and the floor heating module are fixedly connected by the adhesive.

[0012] In an optional embodiment, the partition includes a clamping plate located between the panel and the positioning seat, and a clamping block is provided at a position of the clamping plate corresponding to the clamping groove.

[0013] In an optional embodiment, the partition further includes a baffle disposed at an angle to the snap-in plate, the baffle abutting against a side surface of the panel.

[0014] Beneficial effect: By providing a baffle for abutting against the side surface of the panel, it is convenient to locate the relative position of the partition and the panel when the partition and the panel are fixedly connected, which is conducive to improving construction efficiency.

[0015] In an optional embodiment, the panel includes a stone panel and a honeycomb panel that are stacked.

[0016] Beneficial effect: By overlapping the stone board and the honeycomb board, the thickness of the required stone board can be reduced, which is beneficial to reducing material costs.

[0017] In an optional embodiment, the base plate is set on the floor, and a plurality of adjustment supports are provided between the base plate and the floor. The two ends of the adjustment supports along the direction of gravity are respectively in contact with the base plate and the floor to adjust the inclination angle of the base plate.

[0018] Beneficial effect: By setting a plurality of adjustment supports and adjusting the spacing between the upper and lower end surfaces of the adjustment supports, the angle between the base plate and the horizontal direction can be adjusted as needed.

[0019] In an optional embodiment, the prefabricated floor system further includes an isolation cover plate, which is fixedly connected between the upper end surface of the adjustment support and the base plate.

[0020] Beneficial effect: By fixing the isolation cover plate on the upper end surface of the adjustment support and by fixing the base plate to the isolation cover plate, the positioning and installation of the base plate are facilitated.

[0021] In an optional embodiment, the isolation cover plate includes a fixing portion and a limiting portion that are arranged at an angle and fixedly connected, the fixing portion is fixedly connected to the adjustment support, and the limiting portion is suitable for abutting against the side surface of the base plate.

[0022] In an optional embodiment, the adjustment support includes a sleeve fixedly connected to the floor, and a threaded column threadedly connected to the sleeve, and the upper end of the threaded column is fixedly connected to the fixing portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a front view of an assembled floor system according to an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 A partial enlarged schematic diagram;

[0026] Figure 3 A top view of a positioning seat according to an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the cooperation between a positioning seat and a separator according to an embodiment of the present utility model;

[0028] Figure 5 This is a schematic diagram of the cooperation between another positioning seat and a separator according to an embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the cooperation between another positioning seat and a separator according to an embodiment of the present utility model;

[0030] Figure 7 This is a schematic structural diagram of a separator according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the coordination of the panel, the separator and the positioning seat according to an embodiment of the present utility model;

[0032] Figure 9 for Figure 1 A partial enlarged schematic diagram of B in the figure.

[0033] Description of reference numerals:

[0034] 1. Floor; 2. Adjustment support; 201. Sleeve; 202. Threaded column; 203. Turntable; 3. Base plate; 4. Floor heating module; 5. Panel; 51. Honeycomb panel; 52. Stone board; 6. Isolation cover; 601. Fixing part; 602. Limiting part; 7. Positioning seat; 701. Snap-in groove; 702. Glue injection hole; 8. Separator; 801. Baffle; 802. Snap-in plate; 8021. Snap-in block. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0036] The following combination Figures 1 to 9 , describing the embodiments of the present utility model.

[0037] According to an embodiment of the present invention, there is provided an assembled floor system, comprising:

[0038] Base plate 3;

[0039] The positioning seat 7 is located above the base plate 3 and is fixedly connected to the base plate 3. A local area on the upper end surface of the positioning seat 7 is recessed to form a snap-fit ​​groove 701;

[0040] Panel 5, located above the positioning seat 7;

[0041] The separator 8 is fixedly connected to the panel 5, and at least a portion of the separator 8 abuts against the positioning seat 7. A snap-fit ​​block 8021 is provided at the position of the separator 8 corresponding to the snap-fit ​​groove 701. The snap-fit ​​block 8021 is suitable for being embedded in the snap-fit ​​groove 701 to form a detachable connection between the panel 5 and the positioning seat 7.

[0042] In the assembled floor system provided in this embodiment, the panel 5 falls on the positioning seat 7 under the action of gravity, and the clamping block 8021 falls into the clamping groove 701. At this time, the relative positions of the positioning seat 7 and the panel 5 are fixed, and the panel 5 can be removed from the positioning seat 7 by being lifted, so that the panel 5 and the positioning seat 7 form a detachable connection, and the removed panel 5 can be reused, which is conducive to reducing resource waste and reducing damage to the environment.

[0043] Specifically, the clamping block 8021 is adapted to the clamping slot 701, and the cross-sectional shapes of the clamping block 8021 and the clamping slot 701 include polygonal, circular, elliptical, etc. As a feasible implementation form, combined with Figures 3 to 6 As shown, the snap-in groove 701 is in the shape of a teardrop. The positioning seat 7 is fixedly disposed above the base plate 3. The panel 5 is fixedly connected to the partition 8. By allowing the snap-in block 8021 on the partition 8 to fall into the snap-in groove 701 on the positioning seat 7, the positioning seat 7 limits the horizontal movement of the panel 5. Under the action of gravity, the panel 5 falls onto the positioning seat 7. The positioning seat 7 is fixedly connected to the base plate 3 and supports the panel 5, so that the panel 5 remains fixed in the direction of gravity. Then, under the action of gravity and the cooperation of the snap-in block 8021 and the snap-in groove 701, the panel 5 and the positioning seat 7 form a detachable connection. When the panel 5 needs to be removed, it is only necessary to lift the panel 5 upward to disengage the snap-in block 8021 from the snap-in groove 701, and the panel 5 can be removed from the positioning seat 7. Compared with the related art, in which the panel 5 is glued and fixed to the base plate 3 and needs to be violently removed during disassembly, the installation and disassembly of the panel 5 provided in this embodiment is simple to operate, which is conducive to improving construction efficiency, and the removed panel 5 will not be damaged and form construction waste. The panel 5 can also be reused, which is conducive to reducing waste, lowering carbon emissions, and protecting the environment.

[0044] Taking the rectangular panel 5 as an example, the separator 8 is fixedly connected to the corner of the panel 5. In the non-edge area of ​​the surface layer, that is, where the corners of the four panels 5 meet, the separator 8 is fixedly connected to the corner of the panel 5. Figure 4 As shown, the positioning seat 7 is disc-shaped and has at least one snap-in groove 701 in the sector-shaped area corresponding to each panel 5. The separator 8 is provided with snap-in blocks 8021 that are adapted to the number of snap-in grooves 701 in the sector-shaped area. In the edge area of ​​the surface layer, that is, when the corners of the two panels 5 meet, the spacer 8 is provided with a snap-in block 8021 that is adapted to the number of snap-in grooves 701 in the sector-shaped area. Figure 5 As shown, the positioning seat 7 is semicircular; at the corner of the surface layer, that is, when there is only one corner of the panel 5, the combination Figure 6 As shown, the positioning seat 7 is in the shape of a quarter circle.

[0045] In one embodiment, combined Figures 1 to 9 As shown, the assembled floor system further includes a floor heating module 4 , which is fixedly disposed between the base plate 3 and the positioning seat 7 .

[0046] Specifically, the floor heating module 4 is fixedly connected to the base plate 3 and the positioning seat 7 respectively. The floor heating module 4 includes an electric floor heating module, a water floor heating module, an air energy floor heating module, and a solar floor heating module. Preferably, the floor heating module 4 adopts an electric floor heating module. Compared with other floor heating modules (especially water floor heating), which may require wet operations such as laying pipes under the ground, the use of electric floor heating modules can reduce a large number of wet operations, thereby simplifying the construction method, shortening the construction period, improving the construction environment, and simplifying the subsequent maintenance. In the related art, the height of the floor heating pipe buried using cement mortar is usually about 30mm-50mm, while the height of the electric floor heating module used in this embodiment is 15mm, which is conducive to reducing the occupation of the floor height.

[0047] In one embodiment, combined Figures 1 to 9 As shown, a glue injection hole 702 is opened on the positioning seat 7, and the glue injection hole 702 passes through the positioning seat 7. The glue injection hole 702 is filled with adhesive, and the positioning seat 7 and the floor heating module 4 are fixedly connected by the adhesive.

[0048] Specifically, at least one glue injection hole 702 is provided in the area corresponding to each panel 5 on the positioning seat 7. The glue injection hole 702 passes through the positioning seat 7 and forms openings on the upper and lower end surfaces of the positioning seat 7. The glue injection hole 702 can be a cylindrical hole or a conical hole. Adhesive is filled into the glue injection hole 702 through the opening formed by the glue injection hole 702 on the upper end surface of the positioning seat 7. The adhesive is suitable for contacting the floor heating module 4 through the opening formed by the glue injection hole 702 on the lower end surface of the positioning seat 7, thereby forming a fixed connection between the floor heating module 4 and the positioning seat 7 through the adhesive. The adhesive can be a polyurethane foam glue or a structural glue.

[0049] In one embodiment, combined Figures 1 to 9 As shown, the partition 8 includes a clamping plate 802 located between the panel 5 and the positioning seat 7 , and a clamping block 8021 is provided at a position of the clamping plate 802 corresponding to the clamping groove 701 .

[0050] Specifically, the clamping plate 802 is fixedly connected to the lower end surface of the panel 5. The clamping block 8021 and the clamping plate 802 can be fixedly connected in a separate manner, such as a bolted connection, or can be an integral structure formed by protruding the area of ​​the clamping plate 802 corresponding to the clamping groove 701, such as an integral injection molding. Preferably, the clamping plate 802 is a flat plate.

[0051] In one embodiment, combined Figures 1 to 9 As shown, the partition 8 further includes a baffle 801 arranged at an angle to the snap-in plate 802 , and the baffle 801 abuts against the side surface of the panel 5 .

[0052] The assembled floor system provided in this embodiment is provided with a baffle 801 for abutting against the side of the panel 5, so as to facilitate the relative positioning of the partition 8 and the panel 5 when the partition 8 and the panel 5 are fixedly connected, which is conducive to improving construction efficiency.

[0053] Specifically, before the separator 8 and panel 5 are installed, they are pre-fixed together. As a feasible implementation, the separator 8 and panel 5 are assembled together at the factory. The provision of baffles 801 facilitates the abutment of the sides of the panel 5 during the installation of the separator 8 and panel 5, thereby improving the accuracy and convenience of positioning the separator 8 and panel 5. After the separator 8 and panel 5 are fixed together, they can be directly installed on the construction site by engaging the snap-fit ​​grooves 701 on the positioning base 7, which improves installation efficiency and facilitates secondary disassembly and reuse.

[0054] In one embodiment, combined Figures 1 to 9 As shown, the panel 5 includes a stone panel 52 and a honeycomb panel 51 that are stacked.

[0055] The assembled floor system provided in this embodiment can reduce the required thickness of the stone panels 52 by stacking the stone panels 52 and the honeycomb panels 51 , which is beneficial to reducing material costs.

[0056] Specifically, the thickness of the panel 5, that is, the overall thickness of the stone panel 52 and the honeycomb panel 51 is 15mm to 30mm. The honeycomb panel 51 includes an aluminum honeycomb panel, a stainless steel honeycomb panel, a wooden honeycomb panel, etc. Preferably, the honeycomb panel 51 adopts an aluminum honeycomb panel and is combined with the stone panel 52 to form an aluminum honeycomb stone panel. As a feasible implementation form, the thickness of the aluminum honeycomb stone panel is selected to be 20mm. Compared with traditional stone floors, the thickness of the paved stone needs to reach more than 20mm. When using aluminum honeycomb stone panels, the thickness of the stone only needs to be 10mm, reducing the stone material cost by 50%.

[0057] In one embodiment, combined Figures 1 to 9 As shown, the base plate 3 is arranged on the floor 1, and multiple adjustment supports 2 are arranged between the base plate 3 and the floor 1. The two ends of the adjustment supports 2 along the gravity direction are respectively in contact with the base plate 3 and the floor 1 to adjust the inclination angle of the base plate 3.

[0058] The assembled floor system provided in this embodiment is configured by providing a plurality of adjustment supports 2 and adjusting the spacing between the upper and lower end surfaces of the adjustment supports 2 so as to adjust the angle between the base plate 3 and the horizontal direction as needed.

[0059] Specifically, a plurality of adjustment supports 2 are provided on the floor 1 to support the base plate 3. When the upper surface of the floor 1 is uneven, the spacing between the upper and lower end surfaces of the adjustment supports 2 is adjusted so that the upper end surfaces of the adjustment supports 2 are on the same horizontal plane, thereby extending the base plate 3 in the horizontal direction. Under the support of the base plate 3 arranged in the horizontal direction, it is helpful to ensure that the panel 5 is arranged in the horizontal direction. The spacing between two adjacent adjustment supports 2 is 200mm to 600mm. As a feasible implementation form, the spacing between two adjacent adjustment supports 2 is 500mm. As an additional implementation form, along the direction of gravity, the plurality of adjustment supports 2 are respectively located at the four vertices of the square, and the spacing between two adjustment supports 2 located on the same side is 500mm.

[0060] Additionally, when the main plane of the base plate 3 is required to have a certain small angle with the horizontal direction, the spacing between the upper and lower end surfaces of the adjustment support 2 can be adjusted as needed to make the base plate 3 have a certain angle with the horizontal direction.

[0061] The base plate 3 is an inorganic mineral base plate, such as GRC (glass fiber reinforced concrete) board, calcium silicate board, magnesium oxysulfate board, etc. The thickness of the base plate 3 is 18mm to 45mm. As a preferred embodiment, the thickness of the base plate 3 is selected to be 26mm.

[0062] In one embodiment, combined Figures 1 to 9As shown, the assembled floor system further includes an isolation cover plate 6 , which is fixedly connected between the upper end surface of the adjustment support 2 and the base plate 3 .

[0063] The assembled floor system provided in this embodiment is configured to facilitate positioning and installation of the base plate 3 by fixing the isolation cover plate 6 to the upper end surface of the adjustment support 2 and by fixing the base plate 3 to the isolation cover plate 6 .

[0064] Specifically, the isolation cover plate 6 is fixedly connected to the upper end of the adjustment support 2. When the base plate 3 needs to be installed, the base plate 3 is fixedly connected to the side of the isolation cover plate 6 away from the adjustment support 2, so that the isolation cover plate 6 can isolate the base plate 3 and the adjustment support 2 while also facilitating the installation and positioning of the base plate 3. Multiple base plates 3 are fixedly connected to the same isolation cover plate 6 to connect the multiple base plates 3 into a whole and prevent the base plates 3 from sliding.

[0065] In one embodiment, combined Figures 1 to 9 As shown, the isolation cover plate 6 includes a fixing portion 601 and a limiting portion 602 that are arranged at an angle and fixedly connected. The fixing portion 601 is fixedly connected to the adjustment support 2, and the limiting portion 602 is suitable for abutting against the side of the base plate 3.

[0066] Specifically, the fixing portion 601 is located between the base plate 3 and the adjustment support 2. The fixing portion 601 can be fixedly connected to the adjustment support 2 by bolting. Alternatively, a groove can be formed on the side of the fixing portion 601 facing the adjustment support 2, corresponding to the depression thereof, and the groove can be snapped onto the upper end of the adjustment support 2, thereby fixing the relative horizontal position of the adjustment support 2 and the fixing portion 601. The limiting portion 602 is arranged at an angle to the fixing portion 601 and is located on the side of the fixing portion 601 facing the base plate 3. The limiting portion 602 abuts against the side of the base plate 3 to limit the base plate 3 in the horizontal direction, thereby preventing the base plate 3 from shifting in the horizontal direction. Taking a rectangular base plate 3 as an example, the isolation cover plate 6 is located at the corner of the base plate 3. The limiting portion 602 is constructed as a bent plate and abuts against the two side surfaces of the corner of the base plate 3 to limit the base plate 3. Furthermore, the limiting portion 602 can also be fixedly connected to the base plate 3, and the forms of fixed connection include bolt connection, gluing, etc., to further enhance the connection stability between the isolation cover plate 6 and the base plate 3, thereby improving the overall stability of the prefabricated floor system.

[0067] In one embodiment, combined Figures 1 to 9 As shown, the adjustment support 2 includes a sleeve 201 fixedly connected to the floor 1 and a threaded column 202 threadedly connected to the sleeve 201 , and the upper end of the threaded column 202 is fixedly connected to the fixing portion 601 .

[0068] Specifically, the sleeve 201 is arranged along the direction of gravity, with its lower end fixedly connected to the floor 1. A hole is provided inside the sleeve 201 along the direction of gravity, and an internal thread is provided in the hole. The threaded column 202 is threadedly connected to the hole. The threaded column 202 is adapted to move up and down along the direction of gravity by rotating about its own axis and under the action of the thread. After rotating the threaded column 202 to adjust its height to the desired position, the upper end of the threaded column 202 is connected to the isolation cover 6. Furthermore, a turntable 203 is fixedly connected to the upper end of the threaded column 202, and the upper end surface of the turntable 203 is parallel to the horizontal direction. An operator can rotate the turntable 203 to drive the threaded column 202 to rotate. The circumferential surface of the turntable 203 is provided with grooves or protrusions arranged at intervals to facilitate the operator to rotate the turntable 203 through the grooves or protrusions. A reinforcement plate is fixedly connected between the outer wall of sleeve 201 and floor 1. Its principal plane is parallel to the direction of gravity. One side of the reinforcement plate is fixedly connected to the outer wall of sleeve 201, and the other side is fixedly connected to floor 1, thereby enhancing the stability of the connection between sleeve 201 and floor 1. Multiple reinforcement plates are provided, spaced apart along the circumference of sleeve 201. Additionally, a base plate is fixedly connected to the bottom of sleeve 201. This base plate is fixedly connected to sleeve 201, the reinforcement plate, and floor 1, thereby enhancing the stability of the connection between adjustable support 2 and floor 1.

[0069] Obviously, the above embodiments are merely examples for the purpose of clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. An assembled floor system, characterized in that: include: Base plate (3); A positioning seat (7) is located above the base plate (3) and is fixedly connected to the base plate (3); a local area of ​​the upper end surface of the positioning seat (7) is recessed to form a snap-fit ​​groove (701); A panel (5) is located above the positioning seat (7); A separator (8) is fixedly connected to the panel (5), and a snap-fit ​​block (8021) is provided on the separator (8) at a position corresponding to the snap-fit ​​groove (701), and the snap-fit ​​block (8021) is adapted to be embedded in the snap-fit ​​groove (701) so as to form a detachable connection between the panel (5) and the positioning seat (7).

2. The assembled floor system according to claim 1, characterized in that: The assembled floor system further comprises a floor heating module (4), and the floor heating module (4) is fixedly arranged between the base plate (3) and the positioning seat (7).

3. The assembled floor system according to claim 2, characterized in that: The positioning seat (7) is provided with a glue injection hole (702), which passes through the positioning seat (7). The glue injection hole (702) is filled with adhesive, and the positioning seat (7) and the floor heating module (4) are fixedly connected via the adhesive.

4. The assembled floor system according to claim 1, characterized in that: The partition (8) comprises a clamping plate (802) located between the panel (5) and the positioning seat (7), and the clamping block (8021) is provided at a position of the clamping plate (802) corresponding to the clamping groove (701).

5. The assembled floor system according to claim 4, characterized in that: The partition (8) further comprises a baffle (801) arranged at an angle to the clamping plate (802), and the baffle (801) abuts against the side surface of the panel (5).

6. The assembled floor system according to claim 1, characterized in that: The panel (5) comprises a stone plate (52) and a honeycomb plate (51) which are stacked.

7. The assembled floor system according to any one of claims 1 to 6, characterized in that: The base plate (3) is arranged on the floor (1), and a plurality of adjustment supports (2) are arranged between the base plate (3) and the floor (1), and the two ends of the adjustment supports (2) along the gravity direction are respectively in contact with the base plate (3) and the floor (1) to be suitable for adjusting the inclination angle of the base plate (3).

8. The assembled floor system according to claim 7, characterized in that: The assembled floor system further comprises an isolation cover plate (6), wherein the isolation cover plate (6) is fixedly connected between the upper end surface of the adjustment support (2) and the base plate (3).

9. The assembled floor system according to claim 8, characterized in that: The isolation cover plate (6) comprises a fixing portion (601) and a limiting portion (602) which are arranged at an angle and fixedly connected, the fixing portion (601) being fixedly connected to the adjustment support (2), and the limiting portion (602) being suitable for abutting against the side surface of the base plate (3).

10. The assembled floor system according to claim 9, characterized in that: The adjustment support (2) comprises a sleeve (201) fixedly connected to the floor (1), and a threaded column (202) threadedly connected to the sleeve (201), wherein the upper end of the threaded column (202) is fixedly connected to the fixing portion (601).

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