Extrusion expansion fixing assembly and connecting and fastening structure of prefabricated assembly type stair

Abstract

The utility model provides an extrusion expansion fixing assembly and a connecting and fastening structure of a prefabricated assembly type stair, and relates to the technical field of assembly type stairs. The extrusion expansion fixing assembly comprises a first main body and a second main body, the first main body is connected with a rod body, and the rod body is provided with a segmentation groove in the length direction; an insertion hole is formed in the second main body, and the rod body can be adaptively inserted into the insertion hole; a boss connected with the second body is arranged at the inserting hole and provided with at least one edge used in cooperation with the dividing groove. The connecting and fastening structure of the prefabricated staircase comprises the prefabricated staircase and a mounting platform, and the prefabricated staircase and the mounting platform are connected at least through an extrusion expansion fixing assembly; positioning pieces are further arranged on the prefabricated stairs and the installation platform so that the difficulty of installing the prefabricated stairs can be reduced, and the efficiency of installing the prefabricated stairs can be improved. According to the utility model, the prefabricated staircase is fastened in various modes and at various angles, so that the connection stability and safety of the prefabricated staircase are improved.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated staircase technology, and in particular to an extrusion expansion fixing component and a connection and fastening structure for prefabricated staircases. Background Technology

[0002] Stairs are one of the most important structural components in residential buildings. They are mainly composed of stair slabs and stair platforms. Stairs are divided into two types: cast-in-place and prefabricated. Among them, prefabricated staircases have the advantages of simple construction, low cost, and short construction period because they are made first and then transported to the construction site for installation.

[0003] Prefabricated stairs are used to improve construction efficiency during building construction. For example, the prefabricated stairs disclosed in the utility model patent with patent publication number CN218508859U include an integrally formed stair body. The stair body is composed of multiple layers of steps connected sequentially along the height direction. Each layer of steps has a lifting hole, and each lifting hole is connected to a pre-embedded part for lifting. The pre-embedded part for lifting is inserted horizontally into the opposite side walls of the lifting hole. The pre-embedded part for lifting is used to allow external lifting equipment to lift the stair body.

[0004] The prefabricated stairs in the aforementioned patent are installed using bolts. Due to the relatively simple fixing method and simple connection structure, they are prone to loosening after long-term use, posing a safety hazard to the normal use of the building. Therefore, it is necessary to further improve the design to solve the above problems. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in related technologies. To this end, this utility model proposes a compression expansion fixing component and a connection and fastening structure for a prefabricated assembled staircase.

[0006] The technical solution to the technical problem solved by this utility model is as follows:

[0007] In a first aspect, this technical solution proposes a compression expansion fixing assembly, including a first main body and a second main body. The first main body is connected to at least one rod, and the rod has a dividing groove along its length, which divides the rod into an open structure. The second main body has at least one insertion hole, and the rod can be inserted into the insertion hole. The insertion hole has a boss connected to the second main body, and the boss has at least one edge that cooperates with the dividing groove. When one end of the rod is inserted into the insertion hole, the edge compresses the dividing groove, expanding the opening of the rod into a trumpet shape, so that the outer wall of the rod is compressed and fixed to the inner wall of the insertion hole.

[0008] Preferably, the cross-sectional shape of the boss is triangular; the rod body is a hollow rod or a solid rod.

[0009] Preferably, the insertion hole is a conical countersunk hole, and the boss is located at the large end of the conical countersunk hole.

[0010] Secondly, this technical solution proposes a connection and fastening structure for prefabricated assembled stairs, including prefabricated stairs and an installation platform, wherein the prefabricated stairs and the installation platform are connected by at least the aforementioned extrusion expansion fixing components.

[0011] Preferably, the installation platform is provided with a locking platform, and one end of the prefabricated staircase is provided with a locking slot that is adapted to and engages with the locking platform; one end of the first main body is fixedly connected to the side wall of the prefabricated staircase; the installation platform has a cavity inside, and the second main body is located in the cavity and can move relative to it; the connection between the rod and the second main body is achieved by moving the second main body through external force.

[0012] Preferably, the second main body is a push plate, and a limiting plate is fixedly connected to the bottom of the push plate, forming an "L" shape with the push plate; the cavity is a stepped groove, divided into an upper groove and a lower groove; the bottom surface of the limiting plate presses against the inner bottom of the upper groove and can slide along the inner bottom; the limiting plate has an extrusion groove, and the installation platform has a grouting groove, which is located directly above the extrusion groove.

[0013] Preferably, the installation platform is provided with a flow channel that connects the upper groove and the lower groove.

[0014] Preferably, the limiting plate has a pre-embedded connecting pipe, and both ends of the connecting pipe pass through the limiting plate and communicate with the cavity in the installation platform.

[0015] Preferably, the prefabricated staircase and the installation platform are further provided with positioning components, the positioning components including positioning columns, the positioning columns being disposed in the lower groove and fixedly connected to the installation platform; a clamping plate is fixedly connected to the slot of the prefabricated platform, one end of the clamping plate is connected to an installation plate, the installation plate having positioning holes adapted to be inserted into the positioning columns, the installation platform having a support slot, and the clamping plate being adapted to be engaged with the support slot.

[0016] Preferably, after installation, the top surface of the mounting plate does not extend beyond the bottom surface of the limiting plate.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] 1. The extrusion expansion fixing component proposed in this utility model utilizes a dividing groove on the rod body and a boss adapted to the dividing groove. By employing the principle of extrusion expansion, the opening of the rod body expands to both sides, thereby achieving an effective connection between the first and second main bodies. This component can be applied in the field of prefabricated buildings, such as in the installation of prefabricated stairs. It has the advantages of simple structure, convenient operation, and effective enhanced connection.

[0019] 2. The prefabricated assembled staircase connection and fastening structure proposed in this utility model uses extrusion expansion fixing components for connection and is reinforced with concrete pouring, so that the components inside the installation platform are fixed together, avoiding the possibility of loosening after long-term use. By increasing the fastening method of the staircase, the occurrence of loosening of the staircase after long-term use is reduced, and the safety of the staircase is improved.

[0020] 3. By setting an extrusion groove on the limiting plate, workers can use a crowbar to move the limiting plate. Subsequently, through the grouting groove, workers can easily insert the crowbar into the extrusion groove. The bottom end of the crowbar acts on the extrusion groove to move the limiting plate, causing the limiting plate to press against the installation plate, thus fixing the installation plate a second time and further improving the stability of the prefabricated staircase. Moreover, the prying and pressing method is simple, convenient, and easy for workers to operate.

[0021] 4. The connection and fastening structure of prefabricated assembled stairs uses positioning components to locate the position of the prefabricated stairs during installation, reducing the difficulty and improving the efficiency of installation. Furthermore, after the subsequent concrete pouring, the mounting plate and positioning column are effectively fixed together, ensuring a firm and reliable connection and improving the safety of the stairs. Attached Figure Description

[0022] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the structure of the extrusion expansion fixing component.

[0024] Figure 2 yes Figure 1 Enlarged schematic diagram of the structure of region A in the middle.

[0025] Figure 3 This is a 3D diagram of the connection and fastening structure of a prefabricated assembled staircase.

[0026] Figure 4 yes Figure 3 A structural schematic diagram of a prefabricated staircase.

[0027] Figure 5 yes Figure 3A partial sectional view of the connection and fastening structure of a prefabricated assembled staircase.

[0028] Figure 6 This is a structural diagram of the mounting plate and the mounting platform when they are not connected.

[0029] Figure 7 This is a structural diagram of the limiting plate and the push plate.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Precast staircase; 101. Socket; 2. Installation platform; 201. Upper groove; 3. Installation plate; 301. Positioning hole; 4. Lower groove; 5. Grouting groove; 6. Guide channel; 7. Limiting plate; 8. Positioning column; 9. Clamping plate; 10. Supporting groove; 11. Connecting pipe; 12. Extrusion groove; 13. Push plate; 14. Rod body; 15. Dividing groove; 16. Insertion hole; 17. Boss; a. First main body; b. Second main body. Detailed Implementation

[0032] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0034] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Example 1:

[0036] like Figure 1 - Figure 2As shown, this embodiment proposes a compression expansion fixing component, including a first body a and a second body b. The first body a and the second body b are, but are not limited to, plate-like structures, block-like structures, etc. The first body a is connected to at least one rod 14. In this embodiment, multiple rods 14 are provided and spaced apart. The rods 14 have a dividing groove 15 along their length direction, which divides the rods 14 into an open structure. The second body b has at least one insertion hole 16, and the number and position of the insertion holes 16 correspond to the rods 14. The rod 14 can be fitted and inserted into the socket 16; the socket 16 is provided with a boss 17 that connects to the second body b. The boss 17 has at least one edge that works with the dividing groove 15. The edge can be inserted into the dividing groove 15 and make the rod 14 on both sides of the dividing groove 15 bend to both sides to form a flared mouth. In use, when one end of the rod 14 is inserted into the socket 16, the edge squeezes the dividing groove 15, expands the opening of the rod 14 into a flared shape, and makes the outer wall of the rod 14 press and fix with the inner wall of the socket 16, thus completing the fixation of the rod 14 and the second body b.

[0037] In this embodiment, the cross-sectional shape of the boss 17 is triangular, rectangular, polygonal, or other irregularly shaped structures with edges. In this embodiment, the rod 14 is a hollow rod or a solid rod. For ease of manufacturing, the rod 14 can be made of bolts, and the dividing groove 15 can be formed by cutting the bolts with a cutting machine.

[0038] In this embodiment, in order to facilitate the installation of the boss 17, the insertion hole 16 is a conical countersunk hole, and the boss 17 is set at the large end of the conical countersunk hole, which can facilitate the insertion of the rod 14.

[0039] The compression expansion fixing assembly of this embodiment utilizes a dividing groove 15 on the rod 14 and a boss 17 adapted to the dividing groove 15. By employing the compression expansion principle, the opening of the rod 14 expands and separates to both sides, thereby achieving an effective connection between the first main body a and the second main body b. This assembly can be applied in the field of prefabricated buildings, such as in the installation of prefabricated stairs 1. It has the advantages of simple structure, convenient operation, and effective connection enhancement.

[0040] Example 2:

[0041] The extrusion expansion fixing component mentioned above can be applied to the assembly of prefabricated stairs. The following is a further explanation using a practical example:

[0042] like Figure 3 - Figure 7 As shown, this embodiment proposes a connection and fastening structure for a prefabricated assembled staircase, including a prefabricated staircase 1 and an installation platform 2. The prefabricated staircase 1 and the installation platform 2 are connected at least using the extrusion expansion fixing component described in Embodiment 1. Specifically, it includes the following:

[0043] The installation platform 2 is equipped with a mounting bracket, and one end of the prefabricated staircase 1 is equipped with a locking slot 101 that fits and engages with the mounting bracket. The locking slot 101 has a "Z" shaped structure. After the prefabricated staircase 1 is assembled with the installation platform 2, the top of the prefabricated staircase 1 can be flush with the installation platform 2. One end of the first main body a is fixedly connected to the side wall of the prefabricated staircase 1. In this embodiment, the first main body a and the prefabricated staircase 1 can be manufactured as a single unit, for example, the rod 14 can be directly embedded in the prefabricated staircase 1; or the first main body a and the prefabricated staircase 1 can be separate structures. It can be a pre-embedded steel plate, which is pre-embedded in the prefabricated staircase 1, and one end of the rod 14 is welded and fixed to the pre-embedded steel plate; in this embodiment, the interior of the installation platform 2 has a cavity to facilitate subsequent grouting; the second body b is located in the cavity and can move relative to it; during installation, the second body b can be moved by external force, so that the second body b can move toward the rod 14. When moving, the boss 17 squeezes the dividing groove 15 of the rod 14 to realize the trumpet-shaped opening of the rod 14, thereby realizing the connection between the rod 14 and the second body b.

[0044] In this embodiment, the second main body b is a plate-shaped structure, named push plate 13. The bottom of push plate 13 is fixedly connected to limiting plate 7, and limiting plate 7 and push plate 13 form an "L" shape. The cavity is a stepped groove, divided into upper groove 201 and lower groove 4. The bottom surface of limiting plate 7 presses against the inner bottom of upper groove 201 and can slide along the inner bottom. Limiting plate 7 has an extrusion groove 12, and the mounting platform 2 has a grouting groove 5, which is located directly above the extrusion groove 12. The extrusion groove 12 is used as the force point to drive the movement of limiting plate 7. The grouting groove 5 has two functions: first, it serves as a grouting port to inject grout into the mounting platform 2; second, it serves as the inlet of a pry bar, through which a pry bar can be inserted, so that the bottom end of the pry bar acts in the extrusion groove 12, using the lever principle to realize the movement of limiting plate 7.

[0045] As can be seen, by setting the extrusion groove 12 on the limiting plate 7, the workers can use a crowbar to move the limiting plate 7. Subsequently, through the grouting groove 5, the workers can easily insert the crowbar into the extrusion groove 12. The bottom end of the crowbar acts on the extrusion groove 12 to move the limiting plate 7, so that the limiting plate 7 presses the mounting plate 3, and fixes the mounting plate 3 for a second time, further improving the stability of the prefabricated staircase 1. Moreover, the prying and pressing method is simple, convenient and easy for workers to operate.

[0046] In this embodiment, to facilitate the flow of concrete, a guide channel 6 is provided inside the installation platform 2, which connects the upper groove 201 and the lower groove 4. The guide channel 6 allows concrete to enter the lower groove 4 more easily, improving the efficiency of concrete pouring into the grouting tank 5 and making the concrete pouring more uniform.

[0047] In this embodiment, for the convenience of grouting, a communicating pipe 11 is embedded in the limiting plate 7. Both ends of the communicating pipe 11 penetrate through the limiting plate 7 and are connected to the cavity in the installation platform 2. When grouting, it is beneficial for the concrete to fill the cavity.

[0048] Application effect: The connection and fastening structure of the precast assembled staircase uses an extrusion expansion fixing component for connection and is accompanied by concrete pouring, so that the components inside the installation platform 2 are consolidated together, avoiding the possibility of connection loosening during long-term use. By increasing the fastening method of the staircase, the occurrence of loosening of the staircase during long-term use is reduced, and the safety of the staircase during use is improved.

[0049] Embodiment Three:

[0050] As Figure 3 - Figure 7 shown, on the basis of Embodiment Two, further optimization is made: Positioning parts are also provided on the precast staircase 1 and the installation platform 2 to reduce the positioning difficulty during assembly; The positioning part includes a positioning column 8. At least one positioning column 8 is provided. In this embodiment, multiple groups can be set. The positioning column 8 is arranged in the lower groove 4 and is fixedly connected to the installation platform 2; A clamping plate 9 is fixedly connected to the bayonet 101 of the precast platform. One end of the clamping plate 9 is connected to a mounting plate 3. The clamping plate 9 and the mounting plate 3 can be an integral structure. The clamping plate 9 and the mounting plate 3 form a "convex" - shaped structure as a whole; The mounting plate 3 is provided with a positioning hole 301 adapted to be inserted and connected with the positioning column 8. During use, the top end of the positioning column 8 penetrates through the positioning hole 301; There is also a support slot 10 on the wall of the installation platform 2, and the clamping plate 9 is adapted to be clamped with the support slot 10. By using the positioning part, when installing the precast staircase 1, the position of the precast staircase 1 is positioned, reducing the difficulty of installing the precast staircase 1 and improving the installation efficiency of the precast staircase 1.

[0051] In this embodiment, after the mounting plate 3 is installed, the top surface of the mounting plate 3 does not exceed the bottom surface of the limiting plate 7 to avoid affecting the movement of the limiting plate 7. To prevent jamming, in this embodiment, the connection between the limiting plate 7 and the push plate 13 has a chamfer, which can facilitate the movement of the limiting plate 7.

[0052] Application effect: The connection and fastening structure of the precast assembled staircase is provided with positioning parts. When installing the precast staircase 1, the position of the precast staircase 1 is positioned, reducing the difficulty of installing the precast staircase 1 and improving the installation efficiency of the precast staircase 1; And after subsequent concrete pouring, the mounting plate 3 and the positioning column 8 are effectively consolidated, firm and reliable, improving the safety of the staircase during use.

[0053] Assembly method:

[0054] The rod 14, mounting plate 3, and clamping plate 9 are pre-embedded and installed during the prefabrication of the precast staircase 1 to form a whole. Afterwards, when transported to the construction site, the precast staircase 1 is moved to a suitable position using lifting equipment. The positioning hole 301 of the mounting plate 3 is aligned with the positioning post 8, causing the mounting plate 3 to fall. The positioning post 8 passes through the positioning hole 301, and the clamping plate 9 is secured to the support slot 10, thus installing the precast staircase 1 into place. The limiting plate 7 and push plate 13 are pre-installed inside the installation platform 2. Workers use a pry bar to insert it through the grouting groove 5. Within the extrusion groove 12, utilizing the lever principle, the push plate 13 and the limiting plate 7 move. During the movement of the push plate 13, the boss 17 extrudes the opening of the rod 14, causing the sides of the rod 14 to deform until the outer wall of the rod 14 is pressed against the inner wall of the insertion hole 16. Subsequently, concrete slurry is poured in through the grouting groove 5. The concrete slurry flows evenly into the cavity through the guide channel 6 and the connecting pipe 11. After the concrete slurry dries, the various structures inside the device solidify into one. This utility model uses multiple methods and angles to fasten the prefabricated assembled stairs, improving the connection stability of the prefabricated assembled stairs, preventing the stairs from loosening after long-term use, and improving the safety and stability of the stairs.

[0055] Although the specific embodiments of the utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the utility model. Based on the technical solution of the utility model, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of the utility model.

Claims

1. A compression expansion fixing assembly, comprising a first body (a) and a second body (b), characterized in that, The first main body (a) is connected to at least one rod (14), and the rod (14) has a dividing groove (15) along its length, which divides the rod (14) into an open structure; the second main body (b) has at least one insertion hole (16), and the rod (14) can be fitted and inserted into the insertion hole (16); the insertion hole (16) is provided with a boss (17) connected to the second main body (b), and the boss (17) has at least one edge that cooperates with the dividing groove (15); when one end of the rod (14) is inserted into the insertion hole (16), the edge squeezes the dividing groove (15), expanding the opening of the rod (14) into a trumpet shape, so that the outer wall of the rod (14) is pressed and fixed to the inner wall of the insertion hole (16).

2. The extrusion expansion fixing assembly according to claim 1, characterized in that, The cross-sectional shape of the boss (17) is triangular; the rod (14) is a hollow rod or a solid rod.

3. The extrusion expansion fixing assembly according to claim 1, characterized in that, The insertion hole (16) is a conical countersunk hole, and the boss (17) is located at the large end of the conical countersunk hole.

4. A connection and fastening structure for a prefabricated assembled staircase, comprising a prefabricated staircase (1) and an installation platform (2), characterized in that, The prefabricated staircase (1) and the installation platform (2) are connected by at least the extrusion expansion fixing assembly as described in any one of claims 1-3.

5. The connection and fastening structure of the prefabricated assembled staircase according to claim 4, characterized in that, The installation platform (2) is provided with a card plate, and one end of the prefabricated staircase (1) is provided with a card slot (101) that is adapted to and engages with the card plate; one end of the first main body (a) is fixedly connected to the side wall of the prefabricated staircase (1); the interior of the installation platform (2) has a cavity, and the second main body (b) is located in the cavity and can move relative to it; the connection between the rod (14) and the second main body (b) is achieved by moving the second main body (b) by external force.

6. The connection and fastening structure of the prefabricated assembled staircase according to claim 5, characterized in that, The second main body (b) is a push plate (13), and the bottom of the push plate (13) is fixedly connected to a limiting plate (7). The limiting plate (7) and the push plate (13) form an "L" shape structure. The cavity is a stepped groove, divided into an upper groove (201) and a lower groove (4). The bottom surface of the limiting plate (7) is pressed against the inner bottom of the upper groove (201) and can slide along the inner bottom. The limiting plate (7) has an extrusion groove (12), and the installation platform (2) has a grouting groove (5). The grouting groove (5) is located directly above the extrusion groove (12).

7. The connection and fastening structure of the prefabricated assembled staircase according to claim 6, characterized in that, The installation platform (2) is provided with a flow channel (6), which connects the upper groove (201) and the lower groove (4).

8. The connection and fastening structure of the prefabricated assembled staircase according to claim 6, characterized in that, The limiting plate (7) has a pre-embedded connecting pipe (11), and both ends of the connecting pipe (11) pass through the limiting plate (7) and communicate with the cavity in the installation platform (2).

9. The connection and fastening structure of the prefabricated assembled staircase according to claim 7, characterized in that, Positioning components are also provided on the prefabricated staircase (1) and the installation platform (2). The positioning components include positioning columns (8), which are set in the lower groove (4) and fixedly connected to the installation platform (2). A card plate (9) is fixedly connected to the slot (101) of the prefabricated staircase (1). One end of the card plate (9) is connected to an installation plate (3). The installation plate (3) has a positioning hole (301) that is adapted to be inserted into the positioning column (8). The installation platform (2) has a support slot (10), and the card plate (9) is adapted to be inserted into the support slot (10).

10. The connection and fastening structure of the prefabricated assembled staircase according to claim 7, characterized in that, After installation, the top surface of the mounting plate (3) does not extend beyond the bottom surface of the limiting plate (7).

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