Fabricated spiral stair

Abstract

The utility model belongs to the technical field of building stair construction, and particularly discloses an assembly type spiral stair which comprises a plurality of prefabricated cement pedals, each prefabricated cement pedal is provided with a connecting part and a pedal part located on one side of the connecting part, and each connecting part is provided with an inserting part and a receiving part matched with the inserting part which are coaxially connected; the connecting parts of all the prefabricated cement pedals are coaxially, vertically and sequentially connected in an inserted mode to form an outer cylinder with an inner cavity, and the pedal parts are arranged in a spiral line mode. And the cast-in-situ center column is formed in the inner cavity in a cast-in-situ manner. According to the prefabricated cement pedal, pre-fixation can be formed from bottom to top through the insertion function of the prefabricated ring of the prefabricated cement pedal, installation can be completed without the help of any supporting component, good coaxiality is achieved, and construction efficiency and quality can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of building staircase construction technology, specifically relating to a prefabricated spiral staircase. Background Technology

[0002] Chinese patent application number 201520446624.6 discloses a spiral staircase constructed using precast treads combined with a cast-in-place central column. During on-site construction, this staircase requires tread support components to pre-fix each tread, facilitating the casting of the central column. Clearly, this method not only requires numerous support components but also lacks a positioning structure, resulting in low installation efficiency and quality. Utility Model Content

[0003] The purpose of this invention is to provide a prefabricated spiral staircase that helps improve installation efficiency and construction quality.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated spiral staircase, comprising:

[0005] Multiple precast cement treads, each precast cement tread having a connecting portion and a tread portion located on one side of the connecting portion, the connecting portion having a coaxially connected insertion portion and a receiving portion that matches the insertion portion; the connecting portions of all precast cement treads are coaxially and vertically inserted sequentially to form an outer column with an internal cavity, and the tread portions are arranged in a spiral manner;

[0006] A cast-in-place central column, which is formed in the internal cavity by cast-in-place method.

[0007] Furthermore, the precast cement tread includes precast cement components and a pre-embedded and fixed metal frame.

[0008] Furthermore, the precast cement component includes a precast ring and a precast tread fixedly connected to the precast ring. The metal frame includes a metal ring and a metal tread fixedly connected to the metal ring. The metal ring includes an exposed ring and a pre-embedded ring coaxially and integrally connected. The pre-embedded ring is embedded in the precast ring to form the receiving part, and the exposed ring is exposed in the precast ring to form the insertion part.

[0009] Furthermore, the precast cement component also includes precast reinforcing bars connecting the bottom surface of the precast tread and the outer circular surface of the precast ring, and the metal frame also includes metal reinforcing bars connecting the bottom surface of the metal tread and the outer circular surface of the embedded ring.

[0010] Furthermore, both the embedded ring and the exposed ring are cylindrical rings.

[0011] Furthermore, the inner wall of the receiving part is provided with at least one positioning element, and the end of the insertion part is provided with a plurality of positioning grooves, the number of which is equal to the number of the precast cement treads.

[0012] Furthermore, the pedal portion is provided with a handrail post mounting hole near its outer edge.

[0013] Furthermore, the pedal portion has a fan-shaped structure with an angle of 15-20°.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1) The precast cement treads in this utility model can form a pre-fixed structure from bottom to top by using the insertion function of their own precast rings. They can be installed without the need for any supporting components and have good coaxiality, which can improve construction efficiency and quality.

[0016] 2) This utility model uses a pre-embedded metal frame to manufacture precast cement treads, which can improve the strength of the treads, reduce the amount of cement used, and thus reduce construction costs.

[0017] 3) The precast cement tread in this utility model has a positioning structure, which can achieve angular positioning during assembly, making it easy to assemble quickly. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural view of a prefabricated spiral staircase installed in an existing building, as shown in Example 1.

[0019] Figure 2 This is a structural side view of the prefabricated spiral staircase installed in an existing building, as shown in Example 1.

[0020] Figure 3 This is a top view of the prefabricated spiral staircase installed in an existing building, as shown in Example 1.

[0021] Figure 4 for Figure 3 Structural sectional view along the AA direction;

[0022] Figure 5 This is a three-dimensional structural view of the precast cement treadmill in Example 1;

[0023] Figure 6 This is a side view of the structure of the precast cement treadmill in Example 1;

[0024] Figure 7 This is a top view of the precast cement treadmill in Example 1;

[0025] Figure 8 This is a three-dimensional structural view of the precast cement component in Example 1;

[0026] Figure 9 This is a three-dimensional view of the metal skeleton in Example 1.

[0027] Reference numerals: 1. Precast concrete tread; 101. Connecting part; 102. Tread part; 103. Precast concrete component; 104. Metal frame; 105. Precast ring; 106. Precast tread; 107. Precast reinforcement; 108. Metal ring; 109. Embedded ring; 110. Exposed ring; 111. Positioning groove; 112. Positioning component; 113. Handrail column mounting hole; 114. Metal tread; 115. Metal reinforcement; 2. Cast-in-place central column; 3. Handrail column; 4. Lower floor slab; 5. Upper floor slab. Detailed Implementation

[0028] 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, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0029] Example 1

[0030] like Figures 1 to 9 As shown, a prefabricated spiral staircase includes multiple precast concrete treads 1 and a cast-in-place central column 2.

[0031] The precast concrete tread 1 has a connecting portion 101 and a tread portion 102 located on one side of the connecting portion 101. Obviously, the connecting portion 101 and the tread portion 102 are integrally manufactured. To achieve axial connection and fixation, the connecting portion 101 has a coaxially connected insertion portion and a receiving portion that matches the insertion portion. Preferably, the outer diameter of the connecting portion 101 is 100-200 mm, and the length of the tread portion 102 is 800-1000 mm. Taking a floor height of 2900 mm as an example, the required number of precast concrete treads 1 is preferably 16-20. When assembling the precast concrete treads 1, the connecting portions 101 of two adjacent precast concrete treads 1 are fixed by interlocking the insertion portion and the receiving portion, thus eliminating the need for supporting members to support the tread portion 102. After all the precast concrete treads 1 are coaxially and vertically inserted and fixed, an outer column with an internal cavity is formed. The joints between the treads 101 can be treated with cement mortar or sealant, and then painted to make the outer column appear as a single structure, which is more aesthetically pleasing. The treads 102 are arranged in a spiral pattern to form a complete spiral staircase. The cast-in-place central column 2 is formed in the internal cavity by cast-in-place method.

[0032] It is important to note that during construction, a pouring opening needs to be made in the upper floor slab 5. The corresponding position on the lower floor slab 4 is then used as the installation location for the first-step tread connection 101, ensuring that the top of the outer column is aligned with the pouring opening, while the top of the cast-in-place central column 2 is flush with the surface of the upper floor slab 5. Obviously, during the construction of the cast-in-place central column 2, reinforcing bars can also be added to the internal cavity to increase its strength.

[0033] like Figures 5-8 As shown, in a preferred embodiment, to improve the strength of the precast concrete tread 1 while reducing the amount of cement used, the precast concrete tread 1 includes a precast concrete component 103 and a pre-embedded and fixed metal frame 104. Preferably, the thickness of the precast concrete component 103 covering the metal frame 104 is 20-40 mm.

[0034] As a preferred example, the precast concrete component 103 includes a precast ring 105 and a precast treadle 106 fixedly connected to the precast ring 105. The metal frame 104 includes a metal ring 108 and a metal treadle 114 fixedly connected to the metal ring 108. The thickness of both the metal ring 108 and the metal treadle 114 is 5-8 mm. The metal ring 108 is a cylindrical ring, which includes an exposed ring 110 and a pre-embedded ring 109 coaxially and integrally connected. The pre-embedded ring 109 is embedded in the precast ring 105 to form a receiving part, and the exposed ring 110 is exposed in the precast ring 105 to form an insertion part. That is, the outer diameter of the exposed ring 110 matches the inner diameter of the pre-embedded ring 109, thereby enabling insertion. The advantage of using the metal ring 108 as the receiving part and the insertion part is that the metal ring 108 is made of steel pipe, which has high processing precision and a smoother surface, thus making assembly smoother and helping to improve assembly efficiency.

[0035] As a preferred example, the precast concrete component 103 further includes precast reinforcing bars 107 connecting the bottom surface of the precast tread 106 and the outer circular surface of the precast ring 105, and the metal frame 104 further includes metal reinforcing bars 115 connecting the bottom surface of the metal tread 114 and the outer circular surface of the embedded ring 109. The thickness of the metal reinforcing bars 115 is 5-8mm.

[0036] To ensure that all precast concrete treads 1 are assembled sequentially in a spiral pattern, with each adjacent precast concrete tread 1 having a fixed angle, four positioning elements 112 are preferably provided on the inner wall of the receiving part to achieve fixed-angle positioning installation. Specifically, the positioning elements 112 are bolts, evenly distributed around the circumference and installed on the embedded ring 109. The exposed ring 110 has several positioning grooves 111 at its end, the number of which is equal to the number of precast concrete treads 1. That is, the number of positioning grooves 111 is an integer multiple of the number of positioning elements 112, thus achieving angle positioning during installation. The positioning elements 112 can be inserted into the corresponding positioning grooves 111 to achieve circumferential angle positioning installation. Furthermore, the positioning elements 112 also have another function: to form a fixed connection with the cast-in-place central column 2 during casting, improving the connection strength between the precast concrete treads 1 and the cast-in-place central column 2.

[0037] As a preferred example, the footboard portion 102 is provided with a handrail post mounting hole 113 near the outer edge for mounting handrail posts 3, and a handrail railing is installed between two adjacent handrail posts 3.

[0038] As a preferred example, the pedal portion 102 has a fan-shaped structure with an angle of 15-20°.

[0039] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0040] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0041] In the description of this utility model, unless otherwise stated, "multiple" means two or more. It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., 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.

[0042] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A prefabricated spiral staircase, characterized in that, include: Multiple precast cement treads (1), each precast cement tread (1) having a connecting part (101) and a tread part (102) located on one side of the connecting part (101), the connecting part (101) having a coaxially connected insertion part and a receiving part matching the insertion part; the connecting parts (101) of all precast cement treads (1) are coaxially and vertically inserted sequentially to form an outer column with an internal cavity, the tread part (102) being arranged in a spiral manner; the precast cement tread (1) includes a precast cement component (103) and a pre-embedded and fixed metal frame (104); the water The precast mud component (103) includes a precast ring (105) and a precast tread (106) fixedly connected to the precast ring (105). The metal frame (104) includes a metal ring (108) and a metal tread (114) fixedly connected to the metal ring (108). The metal ring (108) includes an exposed ring (110) and a pre-embedded ring (109) coaxially and integrally connected. The pre-embedded ring (109) is pre-embedded in the precast ring (105) to form the receiving part. The exposed ring (110) is exposed in the precast ring (105) to form the insertion part. Cast-in-place central column (2), which is formed in the internal cavity by casting.

2. A prefabricated helical stair according to claim 1, characterized in that The precast cement component (103) also includes a precast rib (107) connecting the bottom surface of the precast tread (106) and the outer surface of the precast ring (105), and the metal frame (104) also includes a metal rib (115) connecting the bottom surface of the metal tread (114) and the outer surface of the embedded ring (109).

3. The prefabricated helical stairway according to claim 1, characterized in that Both the embedded ring (109) and the exposed ring (110) are cylindrical rings.

4. The prefabricated helical stairway according to claim 1, characterized in that The inner wall of the receiving part is provided with at least one positioning element (112), and the end of the insertion part is provided with a plurality of positioning grooves (111), the number of positioning grooves (111) being equal to the number of the precast cement treads (1).

5. The prefabricated helical stairway according to claim 1, characterized in that, The pedal part (102) is provided with a handrail post mounting hole (113) near the outer edge.

6. The prefabricated helical stairway according to claim 1, characterized in that The pedal part (102) has a fan-shaped structure with an angle of 15-20°.

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