Steel-concrete combined spiral stair

Abstract

The utility model belongs to the field of spiral stairs, and particularly relates to a steel-concrete combined spiral stair. Comprising supporting columns, steel pedals and steel guardrails, the supporting columns are steel pipes with vertical PBL shear keys welded to the inner walls, the supporting columns are filled with micro-expansion concrete, the supporting columns are fixed to a concrete foundation through stand column flanges and foundation bolts at the bottoms of the supporting columns, holes are formed in the vertical PBL shear keys at equal intervals in the vertical direction, and annular stirrups penetrate through the holes; one vertical main reinforcement is arranged between every two vertical PBL shear keys, the bottoms of the vertical main reinforcements are pre-buried in the concrete foundation, and the vertical main reinforcements are connected with the annular stirrups; one end of each steel pedal is welded to the outer wall of the supporting column, the other end of each steel pedal is overhung, and the steel pedals spirally climb around the supporting column; the steel guardrail is mounted at the overhanging end of the steel pedal; the steel-concrete combined spiral stair structure adopts the steel pipe reinforced concrete stand columns, so that the structural stability is good, and the safety is high; the staircase is relatively simple in structure, convenient to install, small in maintenance workload and good in economical efficiency.

Description

Technical Field

[0001] The utility model belongs to the field of spiral staircases, and particularly relates to a steel-concrete composite spiral staircase. Background Art

[0002] A spiral staircase is a spiral-shaped staircase in which the stair treads are installed around a central pillar. A steel structure staircase is made of steel. Existing steel structure spiral staircases are generally made of ordinary steel. After being used for a long time, the steel structure is prone to rust, which will affect the performance of the spiral staircase. Moreover, the support columns are generally hollow steel pipes with poor stability. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a steel-concrete composite spiral staircase with anti-rust property and strong stability.

[0004] The utility model provides the following technical solution: A steel-concrete composite spiral staircase includes a support column, a steel tread, and a steel guardrail. The support column is a steel pipe with vertical PBL shear keys welded to the inner wall. The support column is filled with slightly expanded concrete inside. The support column is fixed on a concrete foundation through a column bottom column flange and anchor bolts. The vertical PBL shear keys are equally spaced with holes along the vertical direction. Hoop stirrups are passed through the holes. There is a vertical main reinforcement between every two vertical PBL shear keys. The bottom of the vertical main reinforcement is embedded in the concrete foundation. The vertical main reinforcement is connected to the hoop stirrups.

[0005] One end of the steel tread is welded to the outer wall of the support column and the other end is cantilevered. A number of steel treads spiral up around the support column. The steel guardrail is installed at the cantilevered end of the steel tread.

[0006] Further, the cross-section of the steel tread is fan-shaped. The narrow end of the steel tread is grooved and fully penetrated and connected to the support column. The wide end of the steel tread is connected to the steel guardrail.

[0007] Further, the longitudinal section of the steel tread includes a right-angled trapezoid section and a rectangular section. The long base of the right-angled trapezoid section is connected to the support column. The short base of the right-angled trapezoid section is aligned and connected to the short side of the rectangular section. The right-angled side waist of the right-angled trapezoid section and the long side of the rectangular section form the tread surface of the steel tread.

[0008] Further, stiffening ribs are installed between the support column and the column flange. The anchor bolts are located between the two stiffening ribs.

[0009] Further, the vertical PBL shear keys are equally spaced and arranged on the inner wall of the support column.

[0010] Further, a steel railing base is welded to the wide end of the steel tread. The steel guardrail includes railing columns and steel railings. The railing columns extend into the steel railing base and are welded thereto. The steel railings are welded between the railing columns.

[0011] Further, the narrow end of the steel pedal slopes downward.

[0012] Compared with the prior art, the advantages of the present utility model are as follows: The steel-concrete composite rotating staircase structure adopts a steel pipe reinforced concrete column, with good structural stability and strong safety; the outer surface of the rotating staircase steel structure is coated with anti-corrosion paint, not easy to rust, and has a long service life; the staircase structure is relatively simple and convenient for installation, with less maintenance work and good economy. Brief Description of the Drawings

[0013] Figure 1 is a structural schematic diagram of the present utility model;

[0014] Figure 2 is a schematic diagram of the PBL shear key;

[0015] Figure 3 is a schematic diagram of the stiffening rib;

[0016] Figure 4 is a schematic diagram of the circumferential stirrup and vertical main reinforcement;

[0017] Figure 5 is a cross-sectional schematic diagram of the steel pedal;

[0018] Figure 6 is a longitudinal-sectional schematic diagram of the steel pedal.

[0019] In the figures: 1 - support column; 2 - steel railing; 3 - railing column; 4 - steel pedal; 5 - steel railing base; 6 - stiffening rib; 7 - column flange; 8 - anchor bolt; 9 - concrete foundation; 10 - PBL shear key; 11 - circumferential stirrup; 12 - vertical main reinforcement. Detailed Embodiment

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Such as Figure 1 、 Figure 2 、 Figure 4As shown: A steel-concrete composite spiral staircase, including a support column 1, steel treads 4, and a steel guardrail. The support column 1 is a steel pipe with vertical PBL shear keys 10 welded to its inner wall. The interior of the support column 1 is filled with slightly expanding concrete. The support column 1 is fixed to the concrete foundation 9 through a column bottom flange 7 and anchor bolts 8. The vertical PBL shear keys 10 are equally spaced with holes along the vertical direction, and hoop stirrups 11 are inserted into the holes. There is a vertical main reinforcement 12 between every two vertical PBL shear keys 10. The bottom of the vertical main reinforcement 12 is embedded in the concrete foundation 9, and the vertical main reinforcement 12 is connected to the hoop stirrups 11.

[0022] One end of the steel tread 4 is welded to the outer wall of the support column 1 and the other end is cantilevered. A number of steel treads 4 spiral upward around the support column 1; the steel guardrail is installed at the cantilevered end of the steel tread 4.

[0023] As Figure 5 shown: The cross-section of the steel tread 4 is fan-shaped. The narrow end of the steel tread 4 is grooved and fully penetrated and connected to the support column 1. The wide end of the steel tread 4 is connected to the steel guardrail.

[0024] As Figure 6 shown: The longitudinal section of the steel tread 4 includes a right trapezoidal section and a rectangular section. The long base of the right trapezoidal section is connected to the support column 1 to increase the welding length and improve the connection strength. The short base of the right trapezoidal section is aligned and connected to the short side of the rectangular section; the right-angled side waist of the right trapezoidal section and the long side of the rectangular section form the tread surface of the steel tread 4. The narrow end of the steel tread 4 slopes downward to facilitate drainage.

[0025] As Figure 3 shown: A stiffening rib 6 is installed between the support column 1 and the column flange 7; the anchor bolts 8 are located between the two stiffening ribs 6.

[0026] The vertical PBL shear keys 10 are equally spaced on the inner wall of the support column 1; the vertical PBL shear keys 10 are aligned with the stiffening ribs 6 one by one.

[0027] A steel railing base 5 is welded to the wide end of the steel tread 4. The steel guardrail includes railing columns 3 and steel railings 2. The railing columns 3 extend into the steel railing base 5 and are welded to it, and the steel railings 2 are welded between the railing columns 3.

[0028] The outer surface of the steel components of the steel-concrete composite spiral staircase is sprayed with a metal anti-corrosion coating to prevent it from rusting.

[0029] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steel-concrete composite rotating staircase, characterized in that: It includes support columns (1), steel tread plates (4) and steel guardrails. The support column (1) is a steel pipe with vertical PBL shear keys (10) welded to its inner wall. The inside of the support column (1) is filled with slightly expanding concrete. The support column (1) is fixed on the concrete foundation (9) through the column bottom flange (7) and anchor bolts (8). The vertical PBL shear keys (10) are equally spaced with holes along the vertical direction, and hoop stirrups (11) are inserted into the holes. There is a vertical main reinforcement (12) between every two vertical PBL shear keys (10). The bottom of the vertical main reinforcement (12) is embedded in the concrete foundation (9), and the vertical main reinforcement (12) is connected to the hoop stirrups (11). One end of the steel tread plate (4) is welded to the outer wall of the support column (1), and the other end is cantilevered. A number of steel tread plates (4) spiral upward around the support column (1). The steel guardrail is installed at the cantilevered end of the steel tread plate (4).

2. The steel-concrete composite rotating staircase according to claim 1, characterized in that: The cross-section of the steel tread plate (4) is fan-shaped. The narrow end of the steel tread plate (4) is grooved and fully penetrated and connected to the support column (1), and the wide end of the steel tread plate (4) is connected to the steel guardrail.

3. The steel-concrete composite rotary staircase according to claim 2, characterized in that: The longitudinal section of the steel tread plate (4) includes a right trapezoidal section and a rectangular section. The long bottom edge of the right trapezoidal section is connected to the support column (1), and the short bottom edge of the right trapezoidal section is aligned and connected to the short side of the rectangular section. The right-angled side waist of the right trapezoidal section and the long side of the rectangular section form the tread surface of the steel tread plate (4).

4. A steel-concrete composite rotating staircase according to claim 1, characterized in that: Stiffening ribs (6) are installed between the support column (1) and the column bottom flange (7); the anchor bolts (8) are located between the two stiffening ribs (6).

5. A steel-concrete composite rotating staircase according to claim 1, characterized in that: The vertical PBL shear keys (10) are equally spaced on the inner wall of the support column (1).

6. The steel-concrete composite rotary staircase according to claim 2, wherein: A steel railing base (5) is welded to the wide end of the steel tread plate (4). The steel guardrail includes railing columns (3) and steel railings (2). The railing columns (3) extend into the steel railing base (5) and are welded to it, and the steel railings (2) are welded between the railing columns (3).

7. A steel-concrete composite rotating staircase according to claim 2, characterized in that: The narrow end of the steel tread plate (4) slopes downward.

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