A prefabricated structure stair board lower end support node structure

Abstract

The utility model discloses an assembled structure stair step board lower end support node structure, including prefabricated ladder section, lower ladder beam and connecting assembly, be provided with the support flitch on the lower ladder beam, the lower end of prefabricated ladder section rests on the support flitch, the lower end of prefabricated ladder section is set up at least one stair hole, the utility model discloses, when trying to let prefabricated ladder section move downward along the anchor along the downward force of prefabricated ladder section dead weight and use load and produce the ladder fall phenomenon, gasket is against the step surface, prevents the movement of prefabricated ladder section, effectively prevented the ladder fall, when the earthquake, through the clearance between anchor and stair hole, and the cavity of allowing anchor to swing freely in a certain range below gasket, prefabricated ladder section can slide displacement of a certain amount in horizontal direction relative to anchor, this sliding releases the huge internal stress that earthquake force produces when transmitting in the stairwell, provides effective seismic performance.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, and in particular to a construction of a support node at the lower end of a prefabricated stair tread. Background Technology

[0002] In recent years, prefabricated buildings in my country have been developing rapidly. Prefabricated stairs are an essential component in prefabricated buildings. The stair sections are prefabricated in the factory and then transported to the construction site for direct installation. The connection of prefabricated stairs is usually achieved by hinged joints at the top and bottom. The stairs are assembled by the embedded steel bars in the platform stair beams and the reserved holes at the top and bottom of the prefabricated stairs, and then connected by secondary concrete pouring. This method can prevent the stairs from falling, but it is not conducive to earthquake resistance. In addition, there is a connection method in which the upper end of the stairs uses hinged supports and the lower end uses sliding supports. This method is conducive to earthquake resistance, but if the degree of sliding of the stairs is too large, it may lead to serious consequences of the stairs falling.

[0003] Therefore, it is necessary to design a prefabricated staircase tread lower support node structure to prevent the prefabricated staircase from falling during use while providing effective seismic performance. Utility Model Content

[0004] The purpose of this utility model is to provide a prefabricated structure for the support node at the lower end of the stair tread, in order to solve the problem that the existing node connection method for prefabricated stair installation cannot prevent the prefabricated stair from falling during use while providing effective seismic performance.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a prefabricated stair tread lower support node structure, including a prefabricated stair section, a lower stair beam and a connecting component, wherein a supporting cantilever plate is provided on the lower stair beam, and the lower end of the prefabricated stair section rests on the supporting cantilever plate, and the connection between the prefabricated stair section and the supporting cantilever plate is realized by the connecting component;

[0006] At least one step hole is provided at the lower end of the prefabricated stair section. The step hole includes an upper section hole and a lower section hole that are connected. The diameter of the upper section hole is larger than the diameter of the lower section hole. A stepped surface is formed between the upper section hole and the lower section hole. The step hole provides horizontal sliding space and a step surface to prevent falls.

[0007] The connecting assembly includes an anchor rod embedded in the support cantilever plate and a limiting member sleeved on the anchor rod. The limiting member restricts the vertical displacement of the precast stair section and, in conjunction with the step surface, can prevent the precast stair section from falling.

[0008] The anchor rod passes upward through the stepped hole of the prefabricated ladder section, and the anchor rod transmits the horizontal force to the main structure;

[0009] The limiting member is located in the upper section of the stepped hole and its size is larger than the diameter of the lower section of the hole. The limiting member abuts against the step surface to restrict the prefabricated stair section from moving downward relative to the supporting cantilever plate.

[0010] A cavity is formed between the limiting member and the hole wall of the lower section hole. The cavity allows the prefabricated ladder section to make limited displacement in the horizontal direction relative to the anchor rod, providing a buffer for the horizontal sliding of the prefabricated ladder section. There is a gap between the anchor rod and the hole wall of the lower section hole.

[0011] As a further technical solution of this utility model, the limiting member includes a washer and a nut threadedly connected to the anchor rod. The washer is located below the nut and rests on the step surface. The washer expands the force-bearing surface and evenly transmits pressure to the step surface. The nut is used to adjust the position of the washer and pre-tighten the anchor rod.

[0012] As a further technical solution of this utility model, the diameter of the upper hole is 60 mm and the diameter of the lower hole is 50 mm, forming a stepped surface through the diameter difference and providing a horizontal sliding gap.

[0013] As a further technical solution of this utility model, the anchor rod is an M16 bolt rod.

[0014] As a further technical solution of this utility model, it also includes a lubricating isolation layer disposed between the lower end of the prefabricated ladder section and the upper surface of the supporting cantilever plate. The lubricating isolation layer is used to reduce the friction between the contact surfaces of the prefabricated ladder section and the supporting cantilever plate, and to ensure smooth horizontal sliding.

[0015] As a further technical solution of this utility model, it also includes an elastic filling block for filling the gap between the side of the precast stair section and the side of the lower stair beam. The elastic filling block is used to adapt to temperature deformation and seal the gap to facilitate the finishing construction.

[0016] As a further technical solution of this utility model, the upper section hole is filled with sealing material to prevent debris from entering the cavity and affecting the sliding function.

[0017] The present invention provides a prefabricated structure stair tread lower end support node structure, which has the following advantages: when the prefabricated stair section attempts to move downward along the anchor rod by generating a downward force due to its own weight and the load, resulting in a fall, the pad abuts against the step surface to prevent the movement of the prefabricated stair section and effectively prevents the fall.

[0018] During an earthquake, the prefabricated stair section can slide relative to the anchor in the horizontal direction through the gap between the anchor and the step hole, and through the cavity under the gasket that allows the anchor to swing freely within a certain range. This sliding releases the huge internal stress generated when the seismic force is transmitted in the stairwell, providing effective seismic performance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the lower support node structure of this utility model.

[0022] In the diagram: 1. Precast stair section; 11. Stepped opening; 111. Upper section opening; 112. Lower section opening; 113. Stepped surface;

[0023] 2. Lower ladder beam; 21. Supporting cantilever slab;

[0024] 3. Connecting components; 31. Anchor bolt; 32. Limiting components; 321. Washer; 322. Nut;

[0025] 4. Cavity; 5. Lubricating isolation layer; 6. Elastic filler block; 7. Sealing material. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, 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 described embodiments are only some embodiments of this utility model, 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.

[0027] In the description of this utility model, it should be noted that, 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 based on the specific circumstances.

[0028] Please see the appendix Figure 1 - Appendix Figure 2 The present invention provides an embodiment of a prefabricated stair tread lower support node structure, including a prefabricated stair section 1, a lower stair beam 2 and a connecting component 3. A supporting cantilever plate 21 is provided on the lower stair beam 2. The lower end of the prefabricated stair section 1 rests on the supporting cantilever plate 21. The connection between the prefabricated stair section 1 and the supporting cantilever plate 21 is realized through the connecting component 3. The invention also includes an elastic filling block 6 that fills the gap between the side of the prefabricated stair section 1 and the side of the lower stair beam 2. The elastic filling block 6 is used to adapt to temperature deformation and seal the gap to facilitate the finishing construction.

[0029] At least one stepped hole 11 is provided at the lower end of the prefabricated stair section 1. The stepped hole 11 includes an upper section hole 111 and a lower section hole 112 that are connected. The diameter of the upper section hole 111 is larger than the diameter of the lower section hole 112. A stepped surface 113 is formed between the upper section hole 111 and the lower section hole 112. The stepped hole 11 provides horizontal sliding space and a fall-prevention stepped surface 113. The diameter of the upper section hole 111 is 60 mm and the diameter of the lower section hole 112 is 50 mm. The step surface 113 is formed by the difference in diameter, and a horizontal sliding gap is provided.

[0030] The connecting component 3 includes an anchor rod 31 embedded in the support plate 21 and a limiting member 32 sleeved on the anchor rod 31. The anchor rod 31 is an M16 bolt rod. The limiting member 32 restricts the vertical displacement of the precast stair section 1 and cooperates with the step surface 113 to prevent the precast stair section 1 from falling. The limiting member 32 includes a washer 321 and a nut 322 threadedly connected to the anchor rod 31. The washer 321 is located below the nut 322 and rests on the step surface 113. The washer 321 expands the force-bearing surface and evenly transmits pressure to the step surface 113. The nut 322 is used to adjust the position of the washer 321 and pre-tighten the anchor rod 31.

[0031] Anchor rod 31 passes upward through the stepped hole 11 of the precast ladder section 1, and anchor rod 31 transmits horizontal force to the main structure;

[0032] The limiting member 32 is located in the upper section hole 111 of the stepped hole 11, and its size is larger than the diameter of the lower section hole 112. The limiting member 32 abuts against the stepped surface 113 to restrict the prefabricated stair section 1 from moving downward relative to the supporting cantilever plate 21. It also includes a lubricating isolation layer 5 disposed between the lower end of the prefabricated stair section 1 and the upper surface of the supporting cantilever plate 21. The lubricating isolation layer 5 is used to reduce the friction between the contact surfaces of the prefabricated stair section 1 and the supporting cantilever plate 21 to ensure smooth horizontal sliding.

[0033] A cavity 4 is formed between the limiting member 32 and the hole wall of the lower section hole 112. The cavity 4 allows the prefabricated ladder section 1 to make limited displacement in the horizontal direction relative to the anchor rod 31, providing a buffer for the horizontal sliding of the prefabricated ladder section 1. There is a gap between the anchor rod 31 and the hole wall of the lower section hole 112. The upper section hole 111 is filled with sealing material 7 to prevent debris from entering the cavity 4 and affecting the sliding function.

[0034] The specific installation steps are as follows:

[0035] First, prefabricated stair section 1 is manufactured. A professional factory is commissioned to manufacture prefabricated stair section 1 according to the building structural design drawings, the cross-sectional dimensions of the stair structure beams, slabs, columns, etc., and the stress analysis. The prefabricated stair section 1 is manufactured according to the project construction schedule. A step hole 11 is reserved at the lower end of the prefabricated stair section 1. The diameter of the upper hole 111 is 1 mm, and the diameter of the lower hole 112 is 50 mm. The prefabricated stair section 1 is inspected and qualified, and then transported to the construction site in batches for stacking and standby.

[0036] Subsequently, cement mortar was used to smooth the bottom support plate 21 of the lower ladder beam 2, with a thickness of 20 mm. Then, an oil felt was laid on the cement mortar leveling layer of the support plate 21 of the lower ladder beam 2 to form a lubricating isolation layer 5.

[0037] The prefabricated ladder section 1 is lifted by a lifting device and slowly lowered. The pre-reserved step hole 11 at the lower end of the ladder section is aligned with the anchor rod 31 pre-embedded on the support plate 21. The anchor rod 31 passes through the pre-reserved step hole 11 at the lower end of the prefabricated ladder section 1 and rests on the support plate 21.

[0038] Insert washers 321 and nuts 322 sequentially into anchor bolts 31. Washers 321 are placed on step surface 113. Tighten nuts 322 to form a cavity 4 in the lower section of the precast stepped hole 11 of the precast stepped section 1. The upper section hole 111 is sealed with mortar as sealing material 7.

[0039] An elastic filler block 6 is placed in the expansion joint between the precast stair section 1 and the lower stair beam 2. After the structural construction is completed, the building finishing layer is applied to the precast stair section 1.

[0040] In summary, under normal use, the prefabricated stair section 1 generates a downward force due to its own weight and the load. This force attempts to move the prefabricated stair section 1 downward along the anchor rod 31, causing the stair to fall. At this time, the pad 321 will abut against the step surface 113, preventing the movement of the prefabricated stair section 1 and effectively preventing the stair from falling.

[0041] During an earthquake, the main body of the building and the lower stair beam 2 sway horizontally. Due to inertia, the movement of the prefabricated stair section 1 will lag behind that of the main body of the building and the lower stair beam 2, resulting in a relative horizontal displacement between them. When the lower stair beam 2 moves horizontally, the anchor rod 31 embedded in the lower stair beam 2 will move accordingly. Since there is a large gap between the anchor rod 31 and the step hole 11, and there is a cavity 4 under the gasket 321 that allows the anchor rod 31 to swing freely within a certain range, the prefabricated stair section 1 can slide a certain amount of displacement relative to the anchor rod 31 in the horizontal direction. This sliding releases the huge internal stress generated when the seismic force is transmitted in the stairwell, providing effective seismic performance.

[0042] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A prefabricated stair tread lower support node structure, comprising a prefabricated stair section (1), a lower stair beam (2), and a connecting component (3), characterized in that: A support cantilever plate (21) is provided on the lower ladder beam (2), and the lower end of the prefabricated ladder section (1) rests on the support cantilever plate (21); The lower end of the prefabricated ladder section (1) is provided with at least one stepped hole (11). The stepped hole (11) includes an upper section hole (111) and a lower section hole (112) that are connected. The diameter of the upper section hole (111) is larger than the diameter of the lower section hole (112). A stepped surface (113) is formed between the upper section hole (111) and the lower section hole (112). The connecting assembly (3) includes an anchor rod (31) pre-embedded in the support plate (21) and a limiting member (32) sleeved on the anchor rod (31). The anchor rod (31) passes upward through the stepped hole (11) of the prefabricated ladder section (1). The limiting member (32) is located in the upper section hole (111) of the stepped hole (11), and its size is larger than the diameter of the lower section hole (112). The limiting member (32) abuts against the stepped surface (113). A cavity (4) is formed between the limiting member (32) and the hole wall of the lower section hole (112), and there is a gap between the anchor rod (31) and the hole wall of the lower section hole (112).

2. The prefabricated stair tread lower end support node structure according to claim 1, characterized in that: The limiting member (32) includes a washer (321) and a nut (322) threadedly connected to the anchor rod (31), the washer (321) being located below the nut (322) and resting on the stepped surface (113).

3. The prefabricated structure stair tread lower end support node construction according to claim 1, characterized in that: The upper hole (111) has a diameter of 60 mm, and the lower hole (112) has a diameter of 50 mm.

4. The prefabricated stair tread lower end support node structure according to claim 1, characterized in that: The anchor rod (31) is an M16 bolt rod.

5. The prefabricated structure stair tread lower end support node construction according to claim 1, characterized in that: It also includes a lubricating isolation layer (5) disposed between the lower end of the prefabricated ladder section (1) and the upper surface of the support cantilever plate (21).

6. The prefabricated structure stair tread lower end support node construction according to claim 1, characterized in that: It also includes an elastic filler block (6) for filling the gap between the side of the precast stair section (1) and the side of the lower stair beam (2).

7. The prefabricated structure stair tread lower end support node construction according to claim 1, characterized in that: The upper section hole (111) is filled with sealing material (7).

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