Concrete prefabricated combined stair

Abstract

The utility model discloses a prefabricated combination stair of concrete, including inclined bottom board and step platform, the top surface of inclined bottom board evenly divides and opens mortise groove, and the bottom surface of step platform is provided with tenon, and the connection between step platform and inclined bottom board is realized through the tenon insertion mortise groove inside, the inside of inclined bottom board is provided with reinforced skeleton, and the inclined bottom board is made of super high performance concrete, and step platform is made of light weight concrete, the utility model discloses through inclined bottom board adopts super high performance concrete material and built -in reinforced skeleton, has realized guaranteeing bearing capacity while reducing structure thickness, through step platform adopts light weight concrete material, has realized reducing stair whole self weight, reduces the effect of transportation and hoisting cost, through adopting mortise and tenon structure and connecting inclined bottom board and step platform, has realized the effect of improving construction efficiency of simplifying installation process.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, and in particular to a precast concrete composite staircase. Background Technology

[0002] As an important component of industrialized construction, precast concrete staircases have experienced rapid development in my country in recent years. With the continuous advancement of policies promoting prefabricated buildings, the application rate of precast staircases has been increasing year by year. Currently, the mainstream precast staircase products on the market mainly include three categories: all-concrete precast staircases, steel-concrete composite staircases, and precast stacked staircases. Among them, all-concrete precast staircases account for more than 70%, and have advantages such as low cost and mature technology.

[0003] However, there are three prominent problems with existing precast concrete stairs: Traditional precast concrete staircases are too heavy, which increases transportation costs, raises the requirements for hoisting equipment, and reduces on-site installation efficiency. Existing prefabricated staircases mostly use embedded parts for welding or bolt connection, which requires a lot of wet work on site, making it difficult to control the installation accuracy, and the average installation time exceeds 4 hours per section; Traditional concrete materials are prone to cracking and carbonation under long-term loads and environmental conditions, resulting in insufficient durability.

[0004] To address the aforementioned issues, a precast concrete composite staircase is provided. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a precast concrete composite staircase.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model is a precast concrete composite staircase, including a sloping bottom plate and a step platform. The top surface of the sloping bottom plate is evenly divided with tenons, and the bottom surface of the step platform is provided with tenons. The connection between the step platform and the sloping bottom plate is achieved by inserting the tenons into the tenons. The inclined bottom plate is internally equipped with a steel reinforcement frame; The sloping base plate is made of ultra-high performance concrete, and the step platform is made of lightweight concrete.

[0007] As a preferred technical solution of this utility model, the inclined bottom plate has a strength greater than C100, a thickness of 8-10cm, and contains 160kg of steel bars per cubic volume; The strength of the step platform is greater than C25.

[0008] As a preferred embodiment of this utility model, the width and depth of the mortise are 3.2cm, and the width and depth of the tenon are 3cm.

[0009] As a preferred embodiment of this utility model, the longitudinal bars of the steel reinforcement cage have a diameter of not less than 12mm and a spacing of not more than 150mm, the transverse distribution bars have a diameter of not less than 8mm and a spacing of not more than 200mm, and one end of the steel reinforcement cage extends out of the inclined bottom plate and connects with the building structure.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model achieves the goal of reducing structural thickness while ensuring load-bearing capacity by using ultra-high performance concrete material for the sloping base plate and incorporating a built-in steel reinforcement skeleton; it also reduces the overall weight of the staircase and lowers transportation and hoisting costs by using lightweight concrete material for the treads; and it simplifies the installation process and improves construction efficiency by using a mortise and tenon structure to connect the sloping base plate and the treads. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate 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, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall assembly of this utility model; Figure 2 This is a schematic diagram showing the overall disassembly of this utility model; Figure 3 This is a schematic diagram of the overall side cross-section of this utility model; In the diagram: 1. Sloping base plate; 2. Step platform; 11. Mortise and tenon; 12. Steel reinforcement frame; 21. Tenon. Detailed Implementation

[0012] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0013] In the attached diagram, all identical reference numerals refer to the same components.

[0014] Example 1 like Figure 1-3 As shown, this utility model provides a precast concrete composite staircase, including a sloping bottom plate 1 and a step 2. The top surface of the sloping bottom plate 1 is evenly divided with tenons 11, and the bottom surface of the step 2 is provided with tenons 21. The connection between the step 2 and the sloping bottom plate 1 is achieved by inserting the tenons 21 into the tenons 11. The inclined bottom plate 1 is equipped with a steel reinforcement frame 12. The inclined base plate 1 is made of ultra-high performance concrete (UHPC), while the step platform 2 is made of lightweight concrete.

[0015] Furthermore, the inclined bottom plate 1 has a strength greater than C100, a thickness of 8-10cm, and contains 160kg of steel bars per cubic volume; The strength of step platform 2 is greater than that of C25.

[0016] Furthermore, the mortise 11 has a width and depth of 3.2cm, and the tenon 21 has a width and depth of 3cm.

[0017] Furthermore, the longitudinal bars of the steel reinforcement cage 12 have a diameter of not less than 12mm and a spacing of not more than 150mm, the transverse distribution bars have a diameter of not less than 8mm and a spacing of not more than 200mm, and one end of the steel reinforcement cage 12 extends out of the inclined bottom plate 1 and connects with the building structure.

[0018] Specifically, precast concrete composite staircases are used for building staircases, including residential buildings, shopping malls, hospitals, schools, office buildings, factories, and all other buildings that require staircases. During use, the inclined base plate 1 is first fixedly connected to the building structure, with the steel reinforcement frame 12 within the inclined base plate 1 providing structural strength. During assembly, quick-drying high-strength mortar is applied to the mating surfaces of the inclined base plate 1 and the step 2. Then, the tenon 21 at the bottom of the step 2 is aligned with the mortise 11 on the inclined base plate 1 for complete assembly. The dimensions of the inclined base plate 1 and the step 2 can be customized according to actual usage requirements.

[0019] In summary, this utility model achieves the goal of reducing structural thickness while maintaining load-bearing capacity by using ultra-high performance concrete material and an internal steel reinforcement frame for the sloping bottom plate; it reduces the overall weight of the staircase and lowers transportation and hoisting costs by using lightweight concrete material for the treads; and it simplifies the installation process and improves construction efficiency by using a mortise and tenon structure to connect the sloping bottom plate and the treads.

[0020] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A precast concrete composite staircase, characterized in that, It includes a sloping base plate (1) and a step platform (2). The top surface of the sloping base plate (1) is evenly divided with tenons (11), and the bottom surface of the step platform (2) is provided with tenons (21). The connection between the step platform (2) and the sloping base plate (1) is achieved by inserting the tenons (21) into the tenons (11). The inclined bottom plate (1) is provided with a steel reinforcement frame (12). The inclined base plate (1) is made of ultra-high performance concrete, and the step platform (2) is made of lightweight concrete.

2. A precast concrete composite staircase according to claim 1, characterized in that, The inclined bottom plate (1) has a strength greater than C100, a thickness of 8-10cm, and contains 160kg of steel bars per cubic volume; The strength of the step platform (2) is greater than C25.

3. A precast concrete composite staircase according to claim 1, characterized in that, The mortise (11) has a width and depth of 3.2 cm, and the tenon (21) has a width and depth of 3 cm.

4. A precast concrete composite staircase according to claim 1, characterized in that, The longitudinal reinforcement of the steel skeleton (12) has a diameter of not less than 12mm and a spacing of not more than 150mm, and the transverse distribution reinforcement has a diameter of not less than 8mm and a spacing of not more than 200mm. One end of the steel skeleton (12) extends out of the inclined bottom plate (1) and connects with the building structure.

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