Prefabricated stair

Abstract

The utility model provides a prefabricated stair, which belongs to the field of fabricated buildings and at least comprises two stair beam plates and wavy step plates. Wherein the two stair beam plates are arranged side by side, each stair beam plate is provided with a lower chord edge and an upper chord edge in the length direction, the lower chord edges are oppositely located on the lower side and form first bent rib edges, and the two first bent rib edges form double lower chords of the prefabricated stair; the upper chord edge is relatively positioned on the upper side and is saw-toothed; the wavy step plate is connected between the upper chord edges of the two stair beam plates, and the wavy step plate and the upper chord edges jointly form an upper chord of the prefabricated stair. The whole body formed by the sawtooth-shaped upper chord edge and the wavy step plate is used as an upper chord (upper flange) of the prefabricated stair, and the first bending rib edge is used as a lower chord (lower flange) to form an anti-bending beam, so that the rigidity of the stair beam plate is far greater than that of a traditional uniform-section steel plate stair beam.

Description

Technical Field

[0001] The utility model relates to the field of prefabricated buildings, in particular to a precast staircase. Background Art

[0002] For precast staircases, the concrete staircase is heavy, and the steel staircase uses a large amount of steel, resulting in high costs. The traditional steel staircase uses equal-section steel plates on both sides, welds and bends the steel plates as the treads, or sets H-shaped or rectangular steel beams under the treads. The treads do not participate in the overall force of the staircase, resulting in a large amount of steel used. Moreover, the wet operation is required for the later decoration of the staircase beam and the panel, which is rather troublesome.

[0003] Therefore, how to reduce the steel consumption of the steel staircase and achieve rapid decoration is an urgent problem to be solved. Summary of the Utility Model

[0004] The purpose of the utility model is to reduce the steel consumption of the steel staircase and achieve rapid decoration of the staircase. For this reason, the utility model provides a precast staircase, which is characterized by at least including:

[0005] Two stair tread plates, the two stair tread plates are arranged side by side. The stair tread plate has a lower chord side and an upper chord side along the length direction. The lower chord side is relatively located on the lower side and is formed with a first bent rib side. The two first bent rib sides form the double lower chords of the precast staircase; the upper chord side is relatively located on the upper side and is serrated;

[0006] A corrugated tread plate, the corrugated tread plate is connected between the upper chord sides of the two stair tread plates and jointly forms the upper chord of the precast staircase with the upper chord side.

[0007] Preferably, the corrugated tread plate is composed of a plurality of L-shaped treads. The L-shaped tread has a tread surface and a kick surface. The ends of the tread surfaces and the kick surfaces of the plurality of L-shaped treads are sequentially and continuously installed on the serrated upper chord side.

[0008] Preferably, the L-shaped tread is welded to the serrated upper chord side and forms an integral structure with the two stair tread plates.

[0009] Preferably, the first bent rib sides of the two stair tread plates are bent inwardly towards each other.

[0010] Preferably, it further includes a rear decorative panel. The rear decorative panel includes a rear decorative tread panel and a rear decorative kick panel. The rear decorative tread panel is correspondingly installed on the tread surface, and the rear decorative kick panel is correspondingly installed on the kick surface.

[0011] Preferably, it further includes a soft pad. The soft pad is laid on the corrugated tread plate after the precast staircase is installed. The rear decorative panel is laid on the soft pad and is assembled with the corrugated tread plate through holes by installation bolts.

[0012] Preferably, it further includes a ceiling decorative board, which is installed on the first bent rib edge by means of bolt through holes; an installation cavity is formed between the ceiling decorative board and the wavy tread board.

[0013] Preferably, leveling support bolts are provided at the top and bottom of the stair slab beam.

[0014] Preferably, the precast stair is a double-run precast stair; the bottom of the stair slab beam in the upper half of the double-run precast stair is slidably connected to the half-story platform beam; the top of the stair slab beam in the lower half of the double-run precast stair is slidably connected to the half-story platform beam.

[0015] Preferably, a lapping board is further provided at the top of the stair slab beam in the upper half of the double-run precast stair, the lapping board is lapped on the casting body, and the leveling support bolts are provided on the lapping board.

[0016] The following one or several beneficial effects are achieved by adopting the above technical solutions:

[0017] Using the whole formed by the serrated upper chord edge and the wavy tread board as the upper chord (upper flange) of the precast stair, and the first bent rib edge as the lower chord (lower flange) to form a bending-resistant beam, so that the stiffness of the stair slab beam is much greater than that of the traditional equal-section steel plate stair beam; at the same time, the height of the stair slab beam can be greatly reduced, and a thinner side effect than the concrete stair can be achieved;

[0018] The first bent rib edge can facilitate the fixing of the ceiling decorative board;

[0019] The first bent rib edge greatly increases the lateral stiffness of the stair slab beam. Conventional steel stairs using steel plates as the stair slab beam require steel plates more than 16 mm thick, while after using the L-shaped folded edge, only 6 mm steel plates are needed, greatly reducing the steel consumption;

[0020] A large cavity is formed at the bottom of the wavy tread, which can be used for installing lights and wiring;

[0021] The tread surface of the wavy tread can be provided with embossings to increase the out-of-plane bending stiffness, so as to reduce the thickness of the tread steel plate;

[0022] Leveling support bolts are provided at both the top and bottom of the stair slab beam, which can facilitate the adjustment of height and plane positioning errors;

[0023] The tread surface of the wavy tread is embossed upwards. In addition to improving the stiffness of the tread board, it also serves as a temporary stair for construction. After the structure construction is completed, it is convenient to deal with the garbage formed by the accumulation of concrete and other sundries in building construction, and it is convenient for subsequent decoration construction;

[0024] The ladder beam slab does not occupy the stair width, achieving the same effect as a concrete slab stair, and the design is simpler.

[0025] No embedded parts are required, and it is convenient to connect with the main body concrete.

[0026] By using bolts to fix the decorative surface (such as tiles or marble) on the stair structure, dry decoration can be achieved, which is more convenient than the traditional method of pasting with mortar. A soft pad is arranged between the tiles or marble and the corrugated steel plate, avoiding the direct contact between the tiles or marble and the steel plate, which is likely to cause the tiles or marble to be stressed concentratedly and crack. Brief Description of the Drawings

[0027] Figure 1 Shows the structural schematic diagram of the present utility model.

[0028] Figure 2 Shows the partial disassembled schematic diagram of the present utility model.

[0029] Figure 3 Shows the installation schematic diagram of the corrugated tread plate in the present utility model.

[0030] Figure 4 Shows Figure 3 The enlarged view at position A in

[0031] Figure 5 Shows the structural schematic diagram of the ladder beam slab in the present utility model.

[0032] Figure 6 Shows the structural schematic diagram from the bottom view of the present utility model. Detailed Description of the Preferred Embodiments

[0033] The following description is given to enable those skilled in the art to implement and use the present utility model and incorporate it into a specific application background. Various variations and various uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to a wide range of embodiments. Thus, the present utility model is not limited to the embodiments given herein, but should be accorded the broadest scope consistent with the principles and novel features disclosed herein.

[0034] In the following detailed description, many specific details are set forth to provide a more thorough understanding of the present utility model. However, it will be apparent to those skilled in the art that the practice of the present utility model may not necessarily be limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present utility model.

[0035] The reader's attention is drawn to all documents and literature submitted simultaneously with this specification and open to public inspection thereof, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features serving the same, equivalent, or similar purposes. Thus, unless otherwise expressly stated, each feature disclosed is only an example of a group of equivalent or similar features.

[0036] Note that, where used, the terms left, right, front, rear, top, bottom, front, back, clockwise, and counterclockwise are used solely for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative positions and / or orientations between various parts of an object. Additionally, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

[0038] Note that, where used, further, preferably, furthermore, and more preferably are simple introductions for elaborating another embodiment based on the foregoing embodiments. The content following the further, preferably, furthermore, or more preferably, in combination with the foregoing embodiments, constitutes a complete composition of another embodiment. Among several further, preferably, furthermore, or more preferably settings following the same embodiment, any combination can form another embodiment.

[0039] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are merely exemplary and should not be construed as imposing any limitation on the protection scope of the present utility model.

[0040] Please refer to Figures 1 to 6, this embodiment provides a precast staircase, which includes at least two stringer slabs 1 and a wavy tread slab 2; among them, the two stringer slabs 1 are arranged side by side. The stringer slab 1 has a lower chord edge 12 and an upper chord edge 11 along the length direction. The lower chord edge 12 is relatively located on the lower side and is formed with a first bent rib edge 120. The two first bent rib edges 120 form the double lower chords of the precast staircase; the upper chord edge 11 is relatively located on the upper side and is serrated; the wavy tread slab 2 is connected between the upper chord edges 11 of the two stringer slabs 1 and together with the upper chord edge 11 forms the upper chord of the precast staircase.

[0041] The shape of the wavy tread slab 2 is adapted to the installation of the serrated upper chord edge 11. For the wavy tread slab 2, it can be integrally formed or formed by installing multiple tread units on the stringer slab 1. As a preferred embodiment of this embodiment, please refer to Figure 3 , the wavy tread slab 2 is composed of multiple L-shaped treads. The L-shaped tread has a tread surface 21 and a riser surface 22. The ends of the tread surfaces 21 and riser surfaces 22 of the multiple L-shaped treads are sequentially and continuously installed on the serrated upper chord edge 11, thereby forming the wavy tread slab 2.

[0042] Furthermore, the L-shaped treads are welded to the serrated upper chord edge 11 and form an integral structure with the two stringer slabs 1. The multiple L-shaped treads form the wavy tread slab 2, which is connected between the two stringer slabs 1 and forms the overall upper chord of the precast staircase with the upper chord edge 11, thereby strengthening the structural strength. Together with the two stringer slabs 1, the overall precast staircase forms a large channel steel structure (which can be seen from the bottom view). Through finite element analysis, although the upper chord tread is a zigzag structure, it can still withstand the pressure inside the upper chord and effectively improve the vertical stiffness of the stringer. Figure 6 The first bent rib edge 120 is the core component for forming the lower chord of the precast staircase. Specifically, please refer to

[0043] , the first bent rib edges 120 of the two stringer slabs 1 are bent inwardly towards each other to form the double lower chords of the precast staircase. Preferably, the first bent rib edge 120 is bent inwardly from the lower chord edge 12 of the stringer slab 1; or it can also be formed by welding a steel plate to the stringer slab 1. Figure 5

[0044] During the building construction period, the wavy tread slab 2 can be used as a temporary tread. Further, at least a texture can be formed on the tread surface 21 of the wavy tread slab 2. On the one hand, it improves the structural stiffness. On the other hand, it plays an anti-slip role. On the third hand, it can also facilitate the cleaning of the board surface in the later stage.

[0045] ​After the construction period of the building is over, whether the precast staircase is used for household or commercial purposes, further decoration can be carried out. As a preferred embodiment of this first embodiment, the precast staircase further includes a rear decorative panel 3, which includes a rear decorative tread panel 31 and a rear decorative riser panel 32. Further, the rear decorative tread panel 31 is correspondingly installed on the tread 21, and the rear decorative riser panel 32 is correspondingly installed on the riser 22.

[0046] In order to adapt to the installation of the rear decorative panel 3, the precast staircase of this embodiment further includes a soft pad (not shown), which is laid on the wavy tread board 2 after the precast staircase is installed. The rear decorative panel 3 is laid on the soft pad and is assembled with the through holes of the wavy tread board 2 through installation bolts. Preferably, the soft pad is a soundproof pad, generally made of rubber material.

[0047] Please refer to Figure 5 , in order to improve the decoration at the bottom of the precast staircase, the precast staircase further includes a ceiling decorative board 7, which is installed on the first bent rib edge 120 by means of bolt through holes; an installation cavity 10 is formed between the ceiling decorative board 7 and the wavy tread board 2. This installation cavity 10 can be used for the hidden wiring of installing lamps.

[0048] Further, please combine Figure 3 and Figure 5 , after the precast staircase is prefabricated and formed into a whole in the factory and transported to the site for installation, in order to facilitate installation and adapt to the possible unevenness of the installation main body, leveling support bolts 6 are provided at the top and bottom of the ladder beam plate 1 for elevation adjustment.

[0049] As a preferred embodiment of this first embodiment, the precast staircase is a double-run precast staircase. Specifically, the bottom of the ladder beam plate 1 in the upper half of the double-run precast staircase is slidably connected to the half-story platform beam 4; the top of the ladder beam plate 1 in the lower half of the double-run precast staircase is slidably connected to the half-story platform beam 4. Thus, the precast staircase can slide during an earthquake, avoiding the precast staircase participating in the overall force of the structure.

[0050] As is well known, there are installation plates 14 on the half-story platform beam 4 in both the upper half and the lower half of the double-run staircase. In this embodiment, please refer to Figure 3 and Figure 4 , horizontal installation plates 14 are extended and formed at the bottom of the ladder beam plate 1 in the upper half and the top of the ladder beam plate 1 in the lower half, and are installed on the half-story platform beam 4 through leveling support bolts 6. Further, long slots 140 are provided on the horizontal installation plates 14, and the screw part 61 of the leveling support bolt 6 is fixed to the half-story platform beam 4. The long slots 140 have a buffering effect of relative sliding with respect to the screw part 61, and the two sides of the long slots 140 can be locked through support nuts 62 to complete the installation of the ladder beam plate 1.

[0051] Further, please refer to Figure 5 In the upper half of the double - flight precast staircase, a lapping plate 13 is also provided at the top of the middle - ladder beam plate 1. The lapping plate 13 laps on the casting main body 5, and leveling support bolts 6 are provided on the lapping plate 13.

[0052] In this embodiment, the ladder beam plate 1 and the wavy tread plate 2 are preferably made of steel plates; the rear decorative panel 3 is preferably made of marble plates. The bolt - through - hole connection mentioned in this embodiment is a conventional connection method in the field of prefabricated buildings. It is a method of relatively opening holes at corresponding positions of two components to be connected, and then assembling and installing through bolts passing through the holes, which is a conventional connection method well - known to those skilled in the art.

[0053] The beneficial effects of this embodiment are as follows:

[0054] Using the whole formed by the serrated upper chord edge 11 and the wavy tread plate 2 as the upper chord (upper flange) of the precast staircase, and the first bent rib edge 120 as the lower chord (lower flange) to form a bending - resistant beam, the stiffness of the ladder beam plate 1 is much greater than that of the traditional equal - cross - section steel - plate ladder beam; at the same time, the height of the ladder beam plate 1 is greatly reduced, and a thinner side effect than that of concrete stairs can be achieved;

[0055] The first bent rib edge 120 can facilitate the fixation of the ceiling decorative panel 7;

[0056] The first bent rib edge 120 greatly increases the lateral stiffness of the ladder beam plate 1. For a steel staircase with a steel plate as the ladder beam plate 1 conventionally, a steel plate of more than 16 mm is required, while after using the L - shaped folded edge, only a 6 - mm steel plate is needed, greatly reducing the steel consumption;

[0057] A large cavity 10 is formed at the bottom of the wavy tread plate, which can be used for installing lights and routing wires;

[0058] The tread surface 21 of the wavy tread plate can be provided with embossments to increase the out - of - plane bending stiffness, thereby reducing the thickness of the tread steel plate;

[0059] Leveling support bolts 6 are provided at both the top and bottom of the ladder beam plate 1, which can facilitate the adjustment of height and planar positioning error;

[0060] The tread surface 21 of the wavy tread plate has upward - facing embossments. Besides improving the stiffness of the tread plate, it also serves as a temporary staircase for construction, facilitating the handling of garbage formed by the accumulation of concrete and other sundries in building construction, and facilitating subsequent decorative construction;

[0061] The ladder beam plate 1 does not occupy the width of the staircase, achieving the same effect as a concrete slab staircase.

[0062] No embedded parts are required, and it is very convenient to connect with the main body concrete.

[0063] Furthermore, the present utility model has been described in detail in combination with the accompanying drawings and embodiments. Those of ordinary skill in the art can make various variations to the present utility model according to the above description. Therefore, some details in the embodiments should not constitute a limitation to the present utility model, and the protection scope of the present utility model will be defined by the scope defined in the appended claims.

Claims

1. Prefabricated staircase, characterized in that: At least: Two ladder beam plates, the two ladder beam plates are arranged side by side, the ladder beam plates have a lower chord side and an upper chord side along the length direction, the lower chord side is relatively located at the lower side and formed with a first bent rib side, the two first bent rib sides form a double lower chord of the prefabricated staircase; the upper chord side is relatively located at the upper side and is serrated; A wavy tread is connected between the upper chord edges of the two ladder beam plates and forms an upper chord of the prefabricated staircase together with the upper chord edges.

2. The prefabricated staircase according to claim 1, characterized in that: The wavy tread plate is composed of a plurality of L-shaped treads, each of which has a tread and a riser, and the ends of the treads and the risers of the plurality of L-shaped treads are sequentially and continuously installed correspondingly on the serrated upper chord edge.

3. The prefabricated staircase according to claim 2, characterized in that: The L-shaped step is welded to the sawtooth upper chord edge and forms an integral structure with the two ladder beam plates.

4. The prefabricated staircase according to claim 3, characterized in that: The first bending ribs of the two ladder beam plates are bent inwardly toward each other.

5. The prefabricated staircase according to claim 2, characterized in that: It also includes a rear decorative panel, which includes a rear decorative tread panel and a rear decorative kick panel. The rear decorative tread panel is correspondingly installed on the tread surface, and the rear decorative kick panel is correspondingly installed on the kick surface.

6. The prefabricated staircase according to claim 5, characterized in that: It also includes a cushion, which is laid on the wavy tread after the prefabricated staircase is installed. The rear decorative panel is laid on the cushion and assembled with the wavy tread through holes through mounting bolts.

7. The prefabricated staircase according to claim 1, characterized in that: It also includes a ceiling decoration plate, which is installed on the first bent rib edge by means of bolts through holes; an installation cavity is formed between the ceiling decoration plate and the wavy step plate.

8. The prefabricated staircase according to claim 1, characterized in that: The top and bottom of the ladder beam plate are provided with leveling support bolts.

9. The prefabricated staircase according to claim 8, characterized in that: The prefabricated staircase is a double-run prefabricated staircase; the bottom of the ladder beam plate in the upper half of the double-run prefabricated staircase is slidably connected to the half-floor high platform beam; the top of the ladder beam plate in the lower half of the double-run prefabricated staircase is slidably connected to the half-floor high platform beam.

10. The prefabricated staircase according to claim 9, characterized in that: A lap plate is also provided on the top of the ladder beam plate in the upper half of the double-run prefabricated staircase. The lap plate is overlapped on the casting body, and the leveling support bolts are provided on the lap plate.

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