Fabricated steel stair

Abstract

The utility model discloses an assembly type steel stair relates to stair technical field, including main part subassembly, including ladder column, and the first ladder beam is connected through the bolt on the ladder column, and the second ladder beam is connected through the bolt on the first ladder beam, and the pedal is connected through the bolt on the second ladder beam, and the handrail is arranged on the second ladder beam, and the handrail swing joint has the handrail, and the adjusting subassembly is located on the second ladder beam. The utility model has the beneficial effect that: the steel stair each node is optimized as the bolt connection, realizes factory standardization prefabrication and on -the -spot assembly type installation, through adding rotatable fixed pad and rotatable and sliding movable pad on the ladder beam, can adjust the screw hole position through the rotating pad and ensure the pedal horizontal assembly, can also through the movable pad and fill the gap of the pedal size error, and the pad angle can also be automatically locked when tightening the bolt, thereby adapting to different floor height and processing error scene, reduces the construction fault rate.

Description

Technical Field

[0001] This utility model relates to the field of staircase technology, and in particular to a prefabricated steel staircase. Background Technology

[0002] In construction engineering, prefabricated steel staircases traditionally use welding to connect stair columns and beams, beams and treads, railings and beams, and handrails. This method presents several challenges, including difficulties in high-altitude operations, high skill requirements for welders, susceptibility to weld defects, structural deformation and cracking due to welding stress, the need for additional flaw detection and high long-term maintenance costs, and low construction efficiency. Some existing solutions replace welded joints with bolted connections. However, because the slots on the beams that mate with the treads are fixed, when the angle between the beams and the ground increases due to the height of a single floor, the relative positions of the corresponding slots on the two beams cannot remain level with the ground. This makes it difficult to ensure the treads are level after assembly. Furthermore, when there are dimensional errors in the tread manufacturing process, and the width cannot match the distance between the two beams, gaps will appear between the treads and the beams. This not only reduces installation accuracy but also affects connection strength, creating safety hazards. Utility Model Content

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0004] In view of the problems existing in the above and / or existing prefabricated steel staircases, this utility model is proposed.

[0005] Therefore, the problem to be solved by this utility model is that the construction of prefabricated steel staircase nodes using welding connection is difficult, the stair beams and treads are connected by ordinary bolts, the treads are difficult to assemble horizontally due to the change of the included angle of the stair beams, and the gap caused by the dimensional error of the tread processing affects the installation strength.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a prefabricated steel staircase, comprising a main component including a stair column, a first stair beam connected to the stair column by bolts, a second stair beam connected to the first stair beam by bolts, a tread connected to the second stair beam by bolts, a railing provided on the second stair beam, and a handrail movably connected to the railing; An adjustment assembly, located on the second ladder beam, includes an adjustment component. The adjustment component includes a fixed block fixed to the second ladder beam. The fixed block has a rotating groove, and a movable pad is provided in the rotating groove. A first fixed shaft is fixed in the fixed block. The movable pad can slide outside the first fixed shaft. Two threaded holes are provided in the movable pad, and the bolts are threaded into the threaded holes.

[0007] As a preferred embodiment of the prefabricated steel staircase of this utility model, the first fixed shaft is provided with an annular groove, and a circular ring is fixed on the movable pad, the circular ring being slidable in the annular groove.

[0008] As a preferred embodiment of the prefabricated steel staircase described in this utility model, the treads are provided with circular grooves and elongated grooves.

[0009] As a preferred embodiment of the prefabricated steel staircase of this utility model, a fixing pad is rotatably provided inside the fixing block, and a second fixing shaft is connected to the fixing pad by a bearing, the second fixing shaft being fixed inside the fixing block.

[0010] As a preferred embodiment of the prefabricated steel staircase of this utility model, the adjusting component further includes a locking member located within the movable pad, the locking member including a locking block slidably disposed within the movable pad, and a first locking groove being provided on the first fixed shaft, the number of which is multiple.

[0011] As a preferred embodiment of the prefabricated steel staircase of this utility model, wherein: two locking blocks are provided in one of the movable pad blocks, one end of the locking block is inclined, a boss is fixed on the locking block, and a movable groove corresponding to the boss is opened in the movable pad block.

[0012] As a preferred embodiment of the prefabricated steel staircase of this utility model, an elastic pad is fixed on the inner wall of the first locking groove, and one end of the locking block is located in the threaded hole.

[0013] As a preferred embodiment of the prefabricated steel staircase of this utility model, two locking blocks are also slidably arranged inside the fixing pad, and a second locking groove is provided on the second fixing shaft.

[0014] In a preferred embodiment of the prefabricated steel staircase described in this utility model, the elastic pad is also fixed in the second locking groove.

[0015] In a preferred embodiment of the prefabricated steel staircase of this utility model, the size of the rotating groove is larger than the size of the moving pad and the fixed pad.

[0016] The beneficial effects of this utility model are as follows: the nodes of the steel staircase are optimized to bolt connections, realizing standardized prefabrication in the factory and on-site assembly installation. By adding rotatable fixed pads and rotatable and sliding movable pads on the stair beams, the position of the threaded holes can be adjusted by rotating the pads to ensure the horizontal assembly of the treads, and the gaps caused by the size error of the treads can be filled by moving the pads. When tightening the bolts, the angle of the pads can be automatically locked, thereby adapting to different floor heights and processing error scenarios and reducing the construction error tolerance rate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of a prefabricated steel staircase.

[0019] Figure 2 For prefabricated steel staircases Figure 1 Enlarged view of the structure at point A in the middle.

[0020] Figure 3 For prefabricated steel staircases Figure 1 Enlarged view of the structure at point B in the middle.

[0021] Figure 4 This is a structural diagram of the stair columns of a prefabricated steel staircase.

[0022] Figure 5 This is a structural diagram of the first ladder beam of a prefabricated steel staircase.

[0023] Figure 6 This is a structural diagram of the treads for a prefabricated steel staircase.

[0024] Figure 7 This is a structural diagram of the treads of a prefabricated steel staircase from another perspective.

[0025] Figure 8 This is a cross-sectional structural diagram of the treads of a prefabricated steel staircase.

[0026] Figure 9 This is a structural diagram of the movable pad for a prefabricated steel staircase.

[0027] Figure 10 This is a cross-sectional structural diagram of the movable pad of a prefabricated steel staircase.

[0028] Figure 11 For prefabricated steel staircases Figure 10 Enlarged view of the structure at point C.

[0029] Figure 12 This is a structural diagram of the first fixed axis of a prefabricated steel staircase.

[0030] Figure 13 This is a structural diagram of the second fixed axis of a prefabricated steel staircase.

[0031] Figure 14 For prefabricated steel staircases Figure 1 Enlarged view of the structure at point D.

[0032] In the diagram: 1. Main component; 11. Ladder column; 3. Bolt; 12. First ladder beam; 13. Second ladder beam; 14. Pedal; 15. Railing; 16. Handrail; 2. Adjustment assembly; 21. Adjustment component; 211. Fixing block; 211-1. Rotating groove; 212. Moving pad; 213. First fixed shaft; 212-1. Threaded hole; 213-1. Annular groove; 214. Ring; 14-1. Circular groove; 14-2. Long through groove; 215. Fixing pad; 216. Second fixed shaft; 22. Locking component; 221. Locking block; 213-2. First locking groove; 221-1. Boss; 212-2. Moving groove; 222. Elastic pad; 216-1. Second locking groove. Detailed Implementation

[0033] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0036] Example 1, referring to Figures 1-10 and Figure 14This is the first embodiment of the present invention, which provides a prefabricated steel staircase. The prefabricated steel staircase includes a main component 1, including a stair column 11, which is fixed to the structural building body. A first stair beam 12 is connected to the stair column 11 by bolts 3. Multiple first stair beams 12 are connected by bolts 3 and nuts to form a platform in the stairwell. A second stair beam 13 is connected to the first stair beam 12 by bolts 3. A tread 14 is connected to the second stair beam 13 by bolts 3. Second stair beams 13 are provided on both sides of the tread 14. A railing 15 is provided on the second stair beam 13. A handrail 16 is movably connected to the railing 15. The connection between the second stair beam 13 and the railing 15, and between the railing 15 and the handrail 16, is achieved by multiple bolts 3. The bolts 3 used between the stair column 11 and the first stair beam 12, the first stair beam 12 and the second stair beam 13, the second stair beam 13 and the railing 15, and the railing 15 and the handrail 16 must be used in conjunction with nuts.

[0037] In the early stages of steel staircase construction, BIM technology was used for 3D modeling and modular design. All on-site welding methods were replaced with bolt 3 connections, which enables standardized processing in the production workshop and prefabricated installation on the construction site, avoiding on-site welding procedures. Bolt 3 is a high-strength bolt.

[0038] Adjustment component 2, located on the second ladder beam 13, includes an adjustment element 21. The adjustment element 21 facilitates the adjustment of the tread 14 to a state parallel to the ground. At the same time, it can fill the gap between the tread 14 and the second ladder beam 13 caused by the processing error of the tread 14, ensuring that the tread 14 and the second ladder beam 13 can fit tightly, improving installation accuracy, enhancing connection firmness, avoiding loosening and stress concentration caused by gaps, improving structural stability and load-bearing capacity, thereby increasing the fault tolerance rate during construction and making the staircase assembly more flexible and convenient.

[0039] The adjusting component 21 includes a fixing block 211 fixed to the second ladder beam 13. Multiple fixing blocks 211 are provided, with the number corresponding to the pedal 14. A rotating groove 211-1 is provided in the fixing block 211. A movable pad 212 is provided in the rotating groove 211-1. A first fixing shaft 213 is fixed in the fixing block 211. The movable pad 212 can slide outside the first fixing shaft 213. Two threaded holes 212-1 are provided in the movable pad 212. Bolts 3 are threaded into the threaded holes 212-1. The movable pad 212 can slide relative to the second ladder beam 13. Its end face can protrude from the end face of the second ladder beam 13. At the same time, it can rotate relative to the second ladder beam 13 so that the line connecting the two threaded holes 212-1 can be horizontal, thereby ensuring that the pedal 14 can be installed horizontally.

[0040] Example 2, refer to Figures 10-13 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0041] Specifically, the first fixed shaft 213 has an annular groove 213-1, and a ring 214 is fixed on the movable pad 212. The ring 214 can slide in the annular groove 213-1. The outer surface of the ring 214 is provided with protrusions to increase the friction between it and the annular groove 213-1, so that when the movable pad 212 rotates and moves relative to the first fixed shaft 213, there is a certain damping. Under the action of gravity alone, without applying other external forces, the relative position of the two will not change.

[0042] The annular groove 213-1 restricts the movement range of the ring 214, preventing the movable pad 212 from completely detaching from the fixed block 211. Under the combined action of the ring 214 and the annular groove 213-1, the movable pad 212 can slide along the first fixed shaft 213 and rotate relative to the first fixed shaft 213. When the movable pad 212 slides along the first fixed shaft 213, its end face can protrude beyond the end face of the second ladder beam 13, thereby filling the gap between the pedal 14 and the second ladder beam 13 caused by the machining error of the pedal 14. When the size of the pedal 14 is just right, the end face of the movable pad 212 can be coplanar with the end face of the second ladder beam 13.

[0043] Specifically, the pedal 14 has a circular groove 14-1 and a long through groove 14-2. When assembling the pedal 14, the threaded hole 212-1 of the moving pad 212 needs to be aligned with the circular groove 14-1 and the long through groove 14-2, and the bolt 3 is used to thread it into the threaded hole 212-1.

[0044] After one end of the pedal 14 is fitted and assembled with a second ladder beam 13, the other end of the pedal 14 is connected to the movable pad 212 using bolts 3. As the bolts 3 are tightened, when the end face of the bolt head is in contact with the end face of the pedal 14, and the bolts 3 are tightened further, the pedal 14 will be fixed and cannot be moved again. At this time, the bolts 3 will rotate, which will drive the movable pad 212 to move away from the second ladder beam 13, thereby filling the gap between the pedal 14 and the second ladder beam 13.

[0045] Specifically, a fixing pad 215 is rotatably disposed inside the fixing block 211. The fixing pad 215 is also provided with two threaded holes 212-1. A second fixing shaft 216 is connected to the fixing pad 215 by a bearing. Damping is provided at the bearing connection. Without applying other external forces, the relative position of the fixing pad 215 and the second fixing shaft 216 will not change under the action of gravity alone. The second fixing shaft 216 is fixed inside the fixing block 211. One end face of the fixing pad 215 can always be coplanar with the end face of the second ladder beam 13. The fixing pad 215 can rotate relative to the second ladder beam 13, but will not slide relative to the second ladder beam 13.

[0046] The second ladder beam 13, which has a fixed pad 215 inside, needs to be installed with the pedal 14 first. After one side of the pedal 14 is assembled, the other side of the pedal 14 is then assembled so that it is connected to the second ladder beam 13, which has a movable pad 212 inside. That is, both sides of the pedal 14 need to be assembled with the fixed pad 215 and the movable pad 212 one after the other using bolts 3.

[0047] Example 3, referring to Figures 10-13 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0048] Specifically, the adjustment assembly 2 also includes a locking member 22 located within the movable pad 212. The locking member 22 is configured to lock the relative rotation between the movable pad 212 and the first fixed shaft 213, and to lock the relative rotation between the fixed pad 215 and the second fixed shaft 216.

[0049] The locking component 22 includes a locking block 221 that is slidably disposed within the movable pad 212. A first locking groove 213-2 is provided on the first fixed shaft 213. There are multiple first locking grooves 213-2. The width of the first locking groove 213-2 is greater than the width of the locking block 221, so that the sliding of the movable pad 212 on the first fixed shaft 213 will not affect the angle locking of the movable pad 212.

[0050] When the locking block 221 engages with the first locking groove 213-2, the relative angle between the moving pad 212 and the first fixed shaft 213 will be locked, and the moving pad 212 will not be able to continue rotating.

[0051] Specifically, a movable pad 212 is provided with two locking blocks 221. The two locking blocks 221 are symmetrically arranged, with one end of the locking block 221 being inclined. A boss 221-1 is fixed on the locking block 221. A moving groove 212-2 corresponding to the boss 221-1 is opened in the movable pad 212. By setting the boss 221-1 and the moving groove 212-2, the movement range of the locking block 221 within the movable pad 212 is restricted, and it will not separate from the movable pad 212.

[0052] By tilting the bolt 3 into the threaded hole 212-1, the locking block 221 is prevented from obstructing the bolt 3 from being inserted into the threaded hole 212-1. When the bolt 3 is threaded into the threaded hole 212-1, as the bolt 3 is tightened, the end face of the bolt 3 will first contact the inclined surface of the locking block 221, applying a pushing force to the locking block 221 and causing the locking block 221 to move, thereby preventing obstruction of the bolt 3's movement. The outer surface of the tilted end of the locking block 221 is provided with a rubber layer to prevent hard contact with the bolt 3.

[0053] Specifically, an elastic pad 222 is fixed on the inner wall of the first locking groove 213-2. The elastic pad 222 can undergo elastic deformation. The size of the elastic pad 222 corresponds to the size of the first locking groove 213-2. It applies a pushing force to the locking block 221. Without other external forces, the elastic pad 222 will apply a pushing force to the locking block 221, so that one end of the locking block 221 is located in the threaded hole 212-1, while the other end of the locking block 221 will not be engaged with the first locking groove 213-2. At this time, the locking block 221 will not restrict the rotation of the moving pad 212.

[0054] Specifically, two locking blocks 221 are also slidably arranged inside the fixing pad 215, and a second locking groove 216-1 is provided on the second fixing shaft 216. The width of the second locking groove 216-1 corresponds to the width of the locking block 221. When the locking block 221 engages with the second locking groove 216-1, it will restrict the fixing pad 215 from rotating relative to the second fixing shaft 216.

[0055] Specifically, an elastic pad 222 is also fixed inside the second locking groove 216-1, and the size of the elastic pad 222 corresponds to that of the second locking groove 216-1.

[0056] Specifically, the size of the rotating groove 211-1 is larger than the size of the moving pad 212 and the fixed pad 215, so that the rotating groove 211-1 will not hinder the moving pad 212 and the fixed pad 215 from rotating within a certain range, thereby adjusting the angle so that the pedal 14 can remain horizontal.

[0057] When using the pedal 14, when assembling the two sides of the pedal 14 with the two second ladder beams 13, it is necessary to assemble it with the fixed pad 215 and the movable pad 212 in sequence using bolts 3. Rotate the fixed pad 215 and the movable pad 212 to a roughly horizontal position. Then, first align the round groove 14-1 and the long through groove 14-2 of the pedal 14 with the threaded hole 212-1 on the fixed pad 215. Use bolts 3 to pass through the round groove 14-1 and the long through groove 14-2 and thread them into the threaded hole 212-1, so that one side of the pedal 14 fits against the second ladder beam 13 with the fixed pad 215 inside.

[0058] Next, on the other side of the pedal 14, connect it to the second ladder beam 13, which has a movable pad 212 inside. First, push the movable pad 212 so that its end face is coplanar with the end face of the second ladder beam 13. Then, adjust the rotation angle of the movable pad 212 so that the threaded hole 212-1 of the movable pad 212 is aligned with the circular groove 14-1 and the long through groove 14-2. Then, insert the bolt 3 into the circular groove 14-1 and the long through groove 14-2 and thread it into the threaded hole 212-1. As the bolt 3 is tightened, when the end face of the bolt 3 head is in contact with the end face of the pedal 14... After assembly, continue to tighten bolt 3. Since one end of tread 14 is fixed and cannot be moved again, bolt 3 rotates, which will drive the moving pad 212 to move away from the second ladder beam 13, thereby filling the gap between tread 14 and the second ladder beam 13. This ensures that tread 14 and the second ladder beam 13 can fit tightly together, improves installation accuracy, enhances connection firmness, avoids loosening and stress concentration caused by gaps, improves structural stability and load-bearing capacity, thereby increasing the fault tolerance rate during construction and making stair assembly more flexible and convenient.

[0059] During the tightening of bolt 3, as bolt 3 is tightened, the end face of bolt 3 will first contact the inclined surface of locking block 221, applying a pushing force to locking block 221, causing locking block 221 to move. This causes locking block 221 located in moving pad 212 to engage with the first locking groove 213-2, and locking block 221 located in fixed pad 215 to engage with the second locking groove 216-1, thereby restricting the rotation of moving pad 212 and fixed pad 215, and thus locking the angle of pedal 14.

[0060] Afterwards, fine adjustments are made with a level. The bolt 3 is rotated in the opposite direction so that the bolt 3 no longer exerts a squeezing force on the locking block 221. The elastic pad 222 exerts a pushing force on the locking block 221 without engaging with the first locking groove 213-2 and the second locking groove 216-1, thus releasing the rotation restriction of the moving pad 212 and the fixed pad 215. However, at this time, a part of the bolt 3 is still threadedly connected to the threaded hole 212-1. After the level adjustment is completed, the bolt 3 is tightened to complete the angle locking of the tread 14 in a horizontal state, thereby improving the comfort of using the stairs and the rationality of the structural stress.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or 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 or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A fabricated steel stair, characterized in that: include, The main component (1) includes a stair column (11), a first stair beam (12) connected to the stair column (11) by bolts (3), a second stair beam (13) connected to the first stair beam (12) by bolts (3), a step (14) connected to the second stair beam (13) by bolts (3), a railing (15) provided on the second stair beam (13), and a handrail (16) movably connected to the railing (15). The adjustment component (2), located on the second ladder beam (13), includes an adjustment member (21). The adjustment member (21) includes a fixing block (211) fixed on the second ladder beam (13). A rotating groove (211-1) is provided in the fixing block (211). A movable pad (212) is provided in the rotating groove (211-1). A first fixing shaft (213) is fixed in the fixing block (211). The movable pad (212) can slide outside the first fixing shaft (213). Two threaded holes (212-1) are provided in the movable pad (212). The bolt (3) is threadedly connected in the threaded holes (212-1).

2. The fabricated steel stair of claim 1, wherein: The first fixed shaft (213) has an annular groove (213-1), and a ring (214) is fixed on the movable pad (212). The ring (214) can slide in the annular groove (213-1).

3. The prefabricated steel staircase as described in claim 1 or 2, characterized in that: The pedal (14) is provided with a circular groove (14-1) and a long through groove (14-2).

4. The prefabricated steel staircase as described in claim 3, characterized in that: A fixing pad (215) is rotatably disposed inside the fixing block (211), and a second fixing shaft (216) is connected to the fixing pad (215) by a bearing. The second fixing shaft (216) is fixed inside the fixing block (211).

5. The fabricated steel stair of claim 4, wherein: The adjustment component (2) further includes a locking member (22) located in the movable pad (212). The locking member (22) includes a locking block (221) slidably disposed in the movable pad (212). A first locking groove (213-2) is provided on the first fixed shaft (213). There are multiple first locking grooves (213-2).

6. The fabricated steel stair of claim 5, wherein: Two locking blocks (221) are provided in one of the movable pad blocks (212). One end of the locking block (221) is inclined. A boss (221-1) is fixed on the locking block (221). A movable groove (212-2) corresponding to the boss (221-1) is opened in the movable pad block (212).

7. The prefabricated steel staircase as described in claim 5 or 6, characterized in that: An elastic pad (222) is fixed on the inner wall of the first locking groove (213-2), and one end of the locking block (221) is located in the threaded hole (212-1).

8. The prefabricated steel staircase as described in claim 7, characterized in that: Two locking blocks (221) are also slidably disposed inside the fixing pad (215), and a second locking groove (216-1) is provided on the second fixing shaft (216).

9. The fabricated steel stair of claim 8, wherein: The elastic pad (222) is also fixed inside the second locking groove (216-1).

10. The fabricated steel stair of claim 8 or 9, wherein: The size of the rotating groove (211-1) is larger than the size of the moving pad (212) and the fixed pad (215).

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