Single-piece concrete wall stair structure

Abstract

The utility model discloses a single-piece concrete wall stair structure, and belongs to the field of building structures. The structure comprises a middle single-piece concrete wall, concrete platform beam plates at the two ends of the wall and steel structure inclined ladder sections on the two sides of the wall. First embedded parts are arranged in the platform beams and connected with the steel beams, second embedded parts are arranged at the step elevation positions of the concrete wall, angle steel supports are welded, the two ends of the step plates are placed and fixed to the angle steel supports respectively, and stable bearing nodes are formed. The wall body is arranged in the middle and does not occupy the width of the bench, so that the space utilization rate is improved; the inclined ladder section adopts a steel structure to reduce self weight and facilitate assembly and construction; the concrete wall and the angle steel joints work cooperatively, the overall rigidity and the anti-seismic property are enhanced, and the steel angle joint is suitable for various stair forms and has good comprehensive economic benefits and popularization value.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, specifically to a single-piece concrete wall staircase structure suitable for public buildings. Background Technology

[0002] In public buildings and water conservancy projects, outdoor staircases are essential vertical transportation components. Currently, common single-story outdoor staircases mainly adopt concrete frame structures or steel structures. Concrete structure staircases often rely on frame columns located at the corners of inclined stair slabs or platform slabs for load-bearing. This structural form causes the columns to encroach on the effective width of the stair flight, reducing space utilization and affecting visual aesthetics. In addition, inclined beams, inclined slabs, and the resulting short columns in frame structures are prone to sudden changes in stiffness, resulting in inherent defects in their seismic performance. On the other hand, although steel structure staircases have smaller material cross-sections, saving space to some extent, their overall stiffness is often insufficient, making them prone to significant vibrations during use, leading to poor comfort. Furthermore, to ensure overall stability, steel structure staircases usually require additional bracing with the main structure, increasing structural complexity and construction difficulty.

[0003] Therefore, existing staircase structures struggle to achieve a good balance between space utilization, structural performance, user experience, and ease of construction, necessitating a new staircase structure solution that can comprehensively address these issues. Utility Model Content

[0004] This utility model aims to solve the problems of low space utilization, large self-weight, poor seismic performance, and insufficient installation convenience in existing staircase structures. To address these problems, the following technical solution is adopted:

[0005] A single-piece concrete wall staircase structure includes: a single concrete wall located in the middle of the staircase, concrete platform beams and platform slabs set at both ends of the concrete wall, and steel inclined staircases arranged on both sides of the concrete wall, wherein the inclined staircases include steel beams and multiple treads.

[0006] The platform beam is provided with an embedded part for connection with the steel beam;

[0007] The concrete wall is provided with a second embedded part for connection with the step plate at the elevation position corresponding to the step plate;

[0008] Angle steel supports are welded to the side of the embedded part and the steel beam respectively. The two ends of each step plate are placed on the corresponding angle steel supports and fixed, so that the inclined stair section is supported and connected by the concrete wall and the platform beam.

[0009] Furthermore, the first embedded part is arranged on one side of two adjacent platform beams; the first embedded part includes a steel plate embedded in the platform beam and an anchor bar connected to the steel plate; the steel beam is arranged between the two first embedded parts and its two ends are respectively fixed to the steel plate in the first embedded part.

[0010] Furthermore, the second embedded component includes a steel plate embedded in the concrete wall and anchor bars connected to the steel plate.

[0011] Furthermore, the steel plate of the second embedded part extends integrally within the concrete wall along the direction of the inclined ladder section.

[0012] Furthermore, concealed columns are provided at both ends of the concrete wall, and the platform beam is aligned with the concealed columns.

[0013] Furthermore, the treads are arranged along the perimeter of the concrete wall to form a double-flight, triple-flight, or quadruple-flight staircase.

[0014] This invention, by placing a single concrete wall in the middle of the staircase, completely avoids the encroachment of traditional frame columns on the width of the stair flights, thus significantly improving space utilization and making the staircase more aesthetically pleasing. Secondly, the inclined stair flights utilize a steel structure, whose self-weight is significantly less than that of a concrete structure, approximately 15% of the latter. This not only effectively reduces the overall structural load but also facilitates factory prefabrication and rapid on-site assembly, shortening the construction period. More importantly, the centrally located concrete wall, as the main vertical force-transferring and lateral force-resisting component, possesses high in-plane stiffness. Combined with the embedded parts and angle steel supports forming rigid nodes on the wall, it constitutes a highly efficient load-bearing system. This system can not only withstand large vertical and horizontal loads but also significantly enhances the overall stiffness and ductility of the structure, resulting in inter-story drift far less than traditional frame staircases, thus providing superior seismic performance. Furthermore, this structural form is flexible and can adapt to various staircase layouts such as double-flight, triple-flight, and quadruple-flight staircases, making it widely applicable. This utility model's "central wall and side ladder" combined design successfully integrates the advantages of both concrete and steel structures, achieving a balance between space, weight, strength, earthquake resistance, and construction efficiency, resulting in outstanding overall benefits. Attached Figure Description

[0015] Figure 1 This is a schematic plan view of the staircase according to this utility model;

[0016] Figure 2 This is a schematic cross-sectional view of the staircase according to this utility model;

[0017] Figure 3 This is a schematic diagram of the embedded part of this utility model;

[0018] Figure 4This is a schematic diagram of the second embedded part of this utility model;

[0019] Figure 5 This is a schematic diagram of the stair tread assembly structure of this utility model;

[0020] In the diagram: 1. Concrete wall; 2. Platform beam; 3. Platform slab; 4. Steel beam; 5. Step tread; 6. Embedded part one; 7. Embedded part two; 8. Angle steel support; 9. Hidden column. Detailed Implementation

[0021] This utility model relates to a single-piece concrete wall staircase structure. The embodiments of this structure will be described in detail below with reference to the accompanying drawings. It should be understood in the following description that the orientations or positional relationships shown in the figures are for ease of description only and are not intended to limit the actual installation location.

[0022] like Figure 1 and Figure 2 As shown, the basic structure of this utility model includes a single concrete wall 1 located in the middle of the staircase. This concrete wall 1 serves as the core load-bearing and lateral force-resisting component of the entire staircase, with concealed columns 9 integrally cast at both ends to enhance the local load-bearing capacity and stability of the wall. At both ends of the concrete wall 1, concrete platform beams 2 and connected concrete platform slabs 3 are respectively provided. The platform beams 2 are aligned with the concealed columns 9, extending outwards from the concrete wall 1 perpendicular to the concealed columns 9, thus effectively transferring their own load and the staircase load to the foundation. On both sides of the concrete wall 1, steel inclined stair sections are arranged, each consisting of a steel beam 4 and multiple treads 5. The steel beam 4 serves as one of the main load-bearing components of the inclined stair section, while the treads 5 are for users to walk on. This combination of the central concrete wall 1 and the steel stair sections on both sides constitutes the basic layout of this utility model. It avoids the occupation of staircase space by corner columns in traditional frame staircases, making the overall staircase more transparent and significantly improving space utilization.

[0023] The connection between platform beam 2 and steel beam 4 is achieved through embedded part 6. Specifically, embedded part 6 is set on the opposite side of two adjacent platform beams 2, such as... Figure 3 As shown, it includes a steel plate embedded in the concrete of platform beam 2 and anchor bars welded to the steel plate. To ensure reliable connection, the steel plate of embedded part 6 has sufficient thickness, for example, 20mm to 30mm. The anchor bars can be HRB400 grade steel bars and are processed with hooks to enhance the anchoring effect. The end of steel beam 4 is placed between the two embedded parts 6 and fixedly connected to the steel plate of embedded part 6 by high-strength bolts or welding. This connection method forms a support point on the outer side of the stair section (the side away from the concrete wall 1) and transfers the load generated by the inclined stair section to platform beam 2 and the hidden column 9 opposite to platform beam 2.

[0024] On the surface of the concrete wall 1, corresponding to the installation elevation of each step tread 5, a second embedded part 7 is provided. The second embedded part 7 includes a steel plate embedded in the concrete wall 1 and anchor bars welded to it. The thickness of the steel plate can be selected from 16mm to 25mm, and the anchor bars can also be HRB400 grade steel bars with hooks to ensure a firm anchorage with the concrete wall 1. Specifically, such as... Figure 4 As shown, the steel plate of embedded part 2 7 can extend as a whole within the concrete wall 1, corresponding to the inclined direction of the entire inclined stair section, thus forming a continuous support track. Angle steel supports 8 are welded to the outside of the steel plate of embedded part 2 7. Optionally, as... Figure 5 As shown, the angle steel support 8 is made of equilateral angle steel. One side of it is welded and fixed to the steel plate of the embedded part 7 by full welding or intermittent welding, while the other side remains horizontal, forming a support surface for placing the step plate 5.

[0025] like Figure 5 As shown, one end of each step tread 5, the end closest to the concrete wall 1, rests directly on the supporting plane of the angle steel support 8 welded to the embedded part 7, and is fixed by fillet weld. The other end of the step tread 5, the end furthest from the concrete wall 1, is connected to the steel beam 4. This connection can be achieved in the following two ways:

[0026] Firstly, similar angle steel supports 8 are also welded to the side of the steel beam 4, and the same end of the step plate 5 is placed on them and welded.

[0027] Secondly, this end of the step plate 5 is connected to the connector welded to the steel beam 4 by bolts, which makes it easy to disassemble and replace the step plate 5 in the future.

[0028] Regardless of the connection method used, the end of the step plate 5 closest to the wall is reliably supported by the node formed by the angle steel support 8 and the second embedded part 7. Thus, through the coordinated work of the first embedded part 6, the second embedded part 7 and the angle steel support 8, the entire inclined stair section is stably supported between the concrete wall 1 and the platform beam 2, forming a complete load-bearing system.

[0029] This implementation effectively frees up space on both sides of the staircase by combining a centrally located single concrete wall 1 with inclined steel staircases on both sides. The self-weight of the inclined steel staircase is much smaller than that of the concrete structure, approximately 15% of that of a traditional concrete staircase, reducing the overall structural load. The concrete wall 1, as the main vertical load-bearing and lateral force resisting component, has high in-plane stiffness. Combined with the rigid nodes formed by the embedded parts 7 and angle steel supports 8, it enhances the overall structural integrity, enabling it to exhibit excellent performance under vertical and horizontal loads (such as seismic forces), and effectively controlling inter-story displacement. This structural form facilitates prefabricated construction, flexibly adapting to various staircase layouts such as double-flight, triple-flight, and quadruple-flight staircases, broadening its application range. The steel components can be prefabricated in the factory and quickly connected to the concrete parts on-site via embedded parts, helping to improve construction efficiency.

Claims

1. A monolithic concrete wall stair structure comprising: Single piece concrete wall (1) located in the middle of the stairs, concrete platform beam (2) and platform plate (3) arranged at both ends of the concrete wall (1), and steel structure inclined ladder section arranged on both sides of the concrete wall (1) respectively, the inclined ladder section includes steel beam (4) and multiple step plates (5); characterized in that: The platform beam (2) is provided with embedded part one (6) for connecting with the steel beam (4); The concrete wall (1) is provided with embedded part two (7) corresponding to the elevation of the step plate (5) for connecting with the step plate (5); The embedded part two (7) and the side surface of the steel beam (4) are respectively welded with angle steel support (8), both ends of each step plate (5) are respectively rested on the corresponding angle steel support (8) and fixed, so that the inclined ladder section is connected and supported by the concrete wall (1) and the platform beam (2).

2. The monolithic concrete wall stair structure according to claim 1, wherein: The embedded part one (6) is arranged on the opposite side of the adjacent two platform beams (2); the embedded part one (6) includes steel plate embedded in the platform beam (2) and anchoring rib connected with the steel plate; the steel beam (4) is arranged between two embedded part one (6) and both ends are fixed with the steel plate in the embedded part one (6).

3. The monolithic concrete wall stair structure according to claim 1, wherein: The embedded part two (7) includes steel plate embedded in the concrete wall (1) and anchoring rib connected with the steel plate.

4. The monolithic concrete wall stair structure according to claim 3, wherein: The steel plate of the embedded part two (7) extends integrally in the concrete wall (1) corresponding to the direction of the inclined ladder section.

5. The monolithic concrete wall stair structure according to claim 1, wherein: Both ends of the concrete wall (1) are provided with concealed column (9), and the platform beam (2) is arranged in position with the concealed column (9).

6. The monolithic concrete wall stair structure according to claim 1, wherein: The step plate (5) is arranged along the periphery of the concrete wall (1) to form a double run, three run or four run stair form.

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