Fabricated concrete stair connecting structure
By setting up embedded bolts and buffer plates for clearance in the prefabricated concrete stair connection structure, the relative displacement between the stairs and the floor slabs is allowed, the problem of vibration transmission during earthquakes is solved, and the seismic performance and safety of the stairs are improved.
Patent Information
- Application Number
- CN202422054821.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-23
AI Technical Summary
In the case of natural disasters such as earthquakes, the existing prefabricated stair connecting structure, the vibration of the floor is directly transmitted to the stairs, causing the stairs to easily break or collapse, affecting the safety of the overall structure.
A prefabricated concrete stair connection structure is designed. By providing a connection between embedded bolts with gaps at the lower end of the stair body, the relative displacement between the staircase and the floor slab is allowed to reduce vibration transmission. At the same time, structures such as embedded rib frames, embedded steel bars and embedded bolts are adopted to ensure a firm connection between the stairs and the ladder beams, and a buffer plate is added between the lower end of the stair body and the second platform to absorb vibration energy.
By allowing relative displacement between the stairs and the floor slabs, vibration transmission during natural disasters such as earthquakes is reduced, and the seismic performance and safety of the stairs are improved. At the same time, the connection strength and stability between the stairs and the ladder beams are enhanced, local stress concentration is avoided, and the safety of the overall structure is ensured.
Smart Images
Figure CN222991043U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of prefabricated concrete stairs, in particular to a connecting structure of prefabricated concrete stairs. Background Technique
[0002] With the rapid development of the construction industry, people's demand for construction speed is increasing day by day. As a new construction mode, prefabricated buildings have emerged as the times require. Prefabricated buildings greatly improve the construction efficiency of buildings by prefabricating each component in the factory and then assembling and splicing them on site. Among them, prefabricated stairs, as one of the most common components in prefabricated buildings, usually include an upper ladder beam, a lower ladder beam, and a stair body arranged between the upper ladder beam and the lower ladder beam. The upper ladder beam is provided with a first platform, and the upper end of the stair body is placed on the first platform. During the installation process, a special connecting structure is required to ensure the effective splicing of the stair body with the upper ladder beam and the lower ladder beam respectively.
[0003] The existing connecting structures of prefabricated stairs usually adopt the method of in-situ casting with the main structure, that is, the upper and lower ends of the stair body are respectively cast in place with the floor slab of the building, so as to achieve fixation. Although this method can ensure a good connection between the stairs and the building, it has obvious disadvantages: when natural disasters such as earthquakes occur, since there is no relative displacement between the floor slab and the stairs, the vibration generated by the floor slab will be directly transmitted to the stairs, resulting in the risk that the stairs are prone to breakage or even collapse, thus affecting the safety of the overall structure. Summary of the Utility Model
[0004] In order to solve the technical problem of poor shock absorption effect of the existing connecting structure of prefabricated stairs, the utility model provides a connecting structure of prefabricated concrete stairs with improved seismic resistance and enhanced safety.
[0005] The technical solution adopted by the utility model to solve its technical problems is as follows:
[0006] A connecting structure of prefabricated concrete stairs includes an upper ladder beam, a lower ladder beam, and a stair body arranged between the upper ladder beam and the lower ladder beam. The upper ladder beam is provided with a first platform, and the upper end of the stair body is fixed on the first platform by in-situ casting to form an in-situ casting layer. The lower ladder beam is provided with a second platform, the lower end of the stair body is placed on the second platform, the lower ladder beam is vertically and fixedly provided with embedded bolts, the lower end of the stair body has holes, and the embedded bolts pass through the holes, and there is a gap between the outer peripheral side of the embedded bolts and the inner wall of the holes.
[0007] Furthermore, the upper ladder beam is fixedly provided with an embedded reinforcement frame, the embedded reinforcement frame includes a reinforcement frame embedded section and a reinforcement frame exposed section, the upper end of the stair body is fixedly provided with embedded steel bars, the embedded steel bars include a steel bar embedded section and a steel bar exposed section, and the reinforcement frame exposed section and the steel bar exposed section are welded and fixed and are located in the in-situ casting layer.
[0008] Furthermore, embedded stud bolts are fixedly arranged on the upper stair beam. The embedded stud bolts include a stud bolt embedded section and a stud bolt exposed section. The embedded stud bolts are arranged at intervals along the width direction of the upper stair beam. The stud bolt exposed section is fixedly welded to the steel bar exposed section and is located within the secondary casting layer.
[0009] Furthermore, a buffer plate is provided between the lower end of the stair body and the second platform.
[0010] Furthermore, the diameter of the embedded bolt is 20 mm.
[0011] Furthermore, the hole at the lower end of the stair body is an oval hole. Taking the direction from the upper end to the lower end of the horizontal projection of the stair body as the first direction, the long axis direction of the oval hole is consistent with the first direction.
[0012] Furthermore, the upper surface of the upper end of the stair body is flush with the upper surface of the upper stair beam, and the upper surface of the lower end of the stair body is flush with the upper surface of the lower stair beam.
[0013] The beneficial effects of the present utility model are as follows:
[0014] 1. The connection method between the lower end of the stair body and the hole through the embedded bolt with a gap allows a certain degree of relative displacement between the stair body and the floor slab, thereby reducing the impact of floor slab vibration on the stair body during natural disasters such as earthquakes and improving the seismic performance and safety of the stair body.
[0015] 2. By fixedly arranging an embedded reinforcement frame on the upper stair beam and fixedly arranging embedded steel bars at the upper end of the stair body, the exposed section of the reinforcement frame and the exposed section of the steel bar are fixedly welded and located within the secondary casting layer, ensuring a firm connection between the stair body and the upper stair beam.
[0016] 3. The embedded stud bolts are arranged at intervals along the width direction of the upper stair beam. The stud bolt exposed section is fixedly welded to the steel bar exposed section and is located within the secondary casting layer. This can ensure a more uniform and reliable connection between the upper end of the stair body and the upper stair beam, avoid local stress concentration, and additionally improve the overall stability and safety of the connection.
[0017] 4. Adding a buffer plate between the lower end of the stair body and the second platform can absorb part of the vibration energy during natural disasters such as earthquakes, reduce the direct impact between the stair body and the second platform, and further enhance the seismic performance and safety of the stair.
[0018] 5. The diameter of the embedded bolt is 20 mm. This size selection helps to ensure the connection strength between the lower end of the stair body and the lower stair beam, and also facilitates standardized operations during production and installation.
[0019] 6. The hole at the lower end of the staircase body is designed as an oval hole, and the major axis direction of the oval hole is consistent with the direction from the upper end to the lower end of the horizontal projection of the staircase body. This can better adapt to the horizontal displacement of the staircase body during an earthquake, reduce the risk of damage caused by the earthquake, and improve the seismic performance of the staircase.
[0020] 7. The upper surface of the upper end of the staircase body is flush with the upper surface of the upper ladder beam, and the upper surface of the lower end of the staircase body is flush with the upper surface of the lower ladder beam. This not only helps to improve the flatness and aesthetics of the staircase, but also ensures the safety of pedestrians when using the staircase, avoiding safety accidents such as tripping due to height differences. Description of the Drawings
[0021] Figure 1 is a schematic structural diagram of the precast concrete staircase connection structure of the present utility model;
[0022] Figure 2 is a schematic connection diagram of the lower ladder beam and the lower end of the staircase body;
[0023] Figure 3 is a schematic connection diagram of the upper ladder beam and the upper end of the staircase body;
[0024] Figure 4 is a schematic structural diagram of the precast concrete staircase installed on the floor;
[0025] In the figure, the markings are as follows: 1 - upper ladder beam, 11 - first platform, 12 - secondary casting layer, 2 - lower ladder beam, 21 - second platform, 3 - staircase body, 4 - embedded stud, 5 - embedded reinforcement frame, 6 - embedded steel bar, 7 - embedded bolt, 8 - hole, 9 - buffer plate, 10 - steel bar truss. Detailed Embodiment
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clearly expressed, the present utility model will be further described below with reference to the accompanying drawings.
[0027] First, it should be stated that the technical solutions of the embodiments of the present application are clearly and completely described. The described embodiments are part of the embodiments of the present application, rather than limitations on the present utility model. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application.
[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "first", "second", "upper", "lower", "left", "right", "inner", "outer", "axial" or "radial" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present utility model.
[0029] It should be noted that in the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated: it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0030] Refer to Figures 1 to 4 , the present utility model provides an assembled concrete stair connecting structure.
[0031] In an embodiment of the present solution, the assembled concrete stair connecting structure includes an upper stair beam 1, a lower stair beam 2, and a stair body 3 disposed between the upper stair beam 1 and the lower stair beam 2. The upper stair beam 1 is provided with a first platform 11. The upper end of the stair body 3 is fixed on the first platform 11 by secondary casting and forms a secondary casting layer 12. The lower stair beam 2 is provided with a second platform 21. The lower end of the stair body 3 is placed on the second platform 21. The lower stair beam 2 is vertically and fixedly provided with embedded bolts 7. The lower end of the stair body 3 has a hole 8, and the embedded bolts 7 pass through the hole 8, and there is a gap between the outer peripheral side of the embedded bolts 7 and the inner wall of the hole 8.
[0032] The connection method of the lower end of the stair body 3 with the hole 8 through the embedded bolts 7 with a gap allows a certain degree of relative displacement, thereby reducing the influence of the floor vibration on the stairs during natural disasters such as earthquakes and improving the seismic performance and safety of the stairs.
[0033] To enhance the connection strength between the upper stair beam 1 and the building main body, a steel bar truss 10, preferably a triangular truss, can be embedded in the connection transition area between the upper stair beam 1 and the building main body. By using the geometric stability principle of the triangle, the stability of the connection transition area is improved; at the same time, the triangular truss can better disperse the load, improve the bending resistance and bearing capacity of the connection transition area, and ensure the integrity and bearing capacity of the structure.
[0034] For the hole 8, an oval hole is preferred, and other round holes or strip holes can also be provided, which are not particularly limited here, as long as the embedded bolt 7 has a certain displacement space in the hole.
[0035] After the embedded bolt 7 is inserted into the hole 8, one end of the embedded bolt 7 is screwed into the nut until the nut fits against the upper surface of the lower end of the staircase body 3, realizing the pre-tightening between the lower end of the staircase body 3 and the second platform of the lower ladder beam 2.
[0036] In some embodiments, the upper ladder beam 1 is fixedly provided with an embedded reinforcement frame 2. The embedded reinforcement frame 2 includes a frame embedding section and a frame exposed section. The upper end of the staircase body 3 is fixedly provided with an embedded reinforcement bar 6. The embedded reinforcement bar 6 includes a bar embedding section and a bar exposed section. The frame exposed section and the bar exposed section are welded and fixed and are located within the secondary casting layer 12.
[0037] By overlapping the first platform 11 of the upper ladder beam 1 with the upper end of the staircase body 3, and by welding and fixing the frame exposed section and the bar exposed section and being located within the secondary casting layer 12, the firm connection between the staircase body 3 and the upper ladder beam 1 is ensured.
[0038] In some embodiments, the upper ladder beam 1 is fixedly provided with embedded stud bolts 4. The embedded stud bolts 4 include a stud embedding section and a stud exposed section. The embedded stud bolts 4 are arranged at intervals along the width direction of the upper ladder beam 1. The stud exposed section is welded and fixed to the bar exposed section and is located within the secondary casting layer 12.
[0039] The embedded stud bolts 4 further strengthen the structural strength of the upper ladder beam 1. The stud exposed section is welded and fixed to the bar exposed section and is located within the secondary casting layer 12 to disperse the load. The arrangement of the embedded stud bolts 4 at intervals along the width direction of the upper ladder beam 1 can ensure that the connection between the upper end of the staircase body 3 and the upper ladder beam 1 is more uniform and reliable, avoiding local stress concentration.
[0040] In some embodiments, a buffer plate 9 is provided between the lower end of the staircase body 3 and the second platform 21. Here, the buffer plate 9 is generally made of rubber products, polyurethane foam or composite materials. The function of the buffer plate 9 is similar to that of a shock absorber or vibration isolation pad. It can help absorb and disperse the load and reduce the direct impact between structures.
[0041] In some embodiments, the diameter of the embedded bolt 7 is 20 mm. The diameter of the embedded bolt 7 being 20 mm helps to ensure the connection strength between the lower end of the staircase body 3 and the lower ladder beam 2. At the same time, it also facilitates the standardized operation during production and installation. The size of the embedded bolt 7 was not limited in the foregoing embodiments, and those skilled in the art should clearly select an embedded bolt suitable for the actual working conditions.
[0042] In some embodiments, the hole 8 at the lower end of the staircase body 3 is an oval hole. Taking the direction from the upper end to the lower end of the horizontal projection of the staircase body 3 as the first direction, the major axis direction of the oval hole is consistent with the first direction. The major axis direction of the oval hole is consistent with the direction from the upper end to the lower end of the horizontal projection of the staircase body 3, which can better adapt to the horizontal displacement of the staircase body 3 during an earthquake, reduce the risk of damage caused by the earthquake, and improve the seismic performance of the staircase.
[0043] In some embodiments, the upper surface of the upper end of the staircase body 3 is flush with the upper surface of the upper staircase beam 1, and the upper surface of the lower end of the staircase body 3 is flush with the upper surface of the lower staircase beam 2.
Claims
1. An assembled concrete staircase connection structure, comprising an upper staircase beam (1), a lower staircase beam (2) and a staircase body (3) arranged between the upper staircase beam (1) and the lower staircase beam (2), wherein the upper staircase beam (1) is provided with a first platform (11), and the upper end of the staircase body (3) is fixed on the first platform (11) by secondary pouring to form a secondary pouring layer (12), wherein the structure is characterized in that: The lower ladder beam (2) is provided with a second platform (21), the lower end of the staircase body (3) rests on the second platform (21), the lower ladder beam (2) is vertically fixed with an embedded bolt (7), the lower end of the staircase body (3) has a hole (8), the embedded bolt (7) is inserted into the hole (8), and a gap is provided between the outer peripheral side of the embedded bolt (7) and the inner wall of the hole (8).
2. The assembled concrete staircase connection structure according to claim 1 is characterized in that: The upper staircase beam (1) is fixedly provided with an embedded reinforcement frame (5), the embedded reinforcement frame (5) comprising a reinforcement frame embedded section and a reinforcement frame exposed section, the upper end of the staircase body (3) is fixedly provided with embedded steel bars (6), the embedded steel bars (6) comprising a reinforcement embedded section and a reinforcement exposed section, the reinforcement frame exposed section and the reinforcement exposed section are welded and fixed and are located in the secondary casting layer (12).
3. The assembled concrete staircase connection structure according to claim 1 is characterized in that: The upper ladder beam (1) is fixedly provided with embedded bolts (4), the embedded bolts (4) comprising bolt embedded sections and bolt exposed sections, the embedded bolts (4) are arranged at intervals along the width direction of the upper ladder beam (1), the bolt exposed sections are welded and fixed to the steel bar exposed sections and are located in the secondary casting layer (12).
4. The assembled concrete staircase connection structure according to claim 1 is characterized in that: A buffer plate (9) is provided between the lower end of the staircase body (3) and the second platform (21).
5. The assembled concrete staircase connection structure according to claim 1 is characterized in that: The diameter of the embedded bolt (7) is 20 mm.
6. The assembled concrete staircase connection structure according to claim 1 is characterized in that: The hole (8) at the lower end of the staircase body (3) is an elliptical hole, with the direction from the upper end of the horizontal projection of the staircase body (3) pointing to the lower end being the first direction, and the major axis direction of the elliptical hole being consistent with the first direction.
7. The assembled concrete staircase connection structure according to claim 1 is characterized in that: The upper surface of the upper end of the stair body (3) is flush with the upper surface of the upper ladder beam (1), and the upper surface of the lower end of the stair body (3) is flush with the upper surface of the lower ladder beam (2).