Fabricated steel-concrete combined stair based on triangular standard steps

Abstract

The utility model discloses an assembly type steel-concrete combined stair based on triangular standard steps, which comprises two stair beams and a plurality of steps, one end of each stair beam is fixedly connected with a concrete ground, and the other end of each stair beam is fixedly connected with another concrete ground after extending downwards or upwards; the upper side surface of the ladder beam is step-shaped, and the lower side surface of the ladder beam is an upward or downward inclined surface; the steps are located between the two ladder beams and distributed in the length direction of the ladder beams, and the two ends of each step are fixedly connected with the two ladder beams respectively. According to the fabricated steel-concrete combined stair formed by connecting the triangular prefabricated concrete standard steps and the steel stair beams through the embedded sleeves and the bolts, the combined function of steel and concrete is fully played, and compared with a steel stair, the steel consumption is reduced, and the material cost is reduced; compared with a fully-prefabricated concrete stair, the self weight is reduced, and the transportation and hoisting cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of building structures, and particularly relates to an assembled steel-concrete composite staircase based on triangular standard steps. Background Art

[0002] Prefabricated staircases, as prefabricated components, are widely used in newly built buildings such as residences and offices. Common prefabricated staircases include precast concrete staircases and steel staircases. Although precast concrete staircases have low material costs, they have low standardization levels, limited utilization times of steel molds, high amortization costs, are troublesome to manufacture, have large self-weights, and high transportation and installation costs. Although steel staircases have light self-weights, they require a large amount of steel, need anti-corrosion and fireproof treatments. At the same time, the bottom of steel staircases is generally stepped and uneven, with poor building effects, and need to be sealed at the bottom for secondary finishing to make it flat. The railing needs to be welded to the steel staircase, which is troublesome to construct, and the comprehensive cost is higher than that of precast concrete staircases. Content of the Utility Model

[0003] Aiming at the above deficiencies existing in the prior art, the purpose of the utility model is to provide an assembled steel-concrete composite staircase based on triangular standard steps, so as to solve the problems in the prior art that precast concrete staircases have complicated manufacturing processes, large self-weights, high transportation and installation costs, large steel consumption of steel staircases, the need for anti-corrosion and fireproof treatments, secondary finishing, and high comprehensive costs.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] An assembled steel-concrete composite staircase based on triangular standard steps, comprising two stringers and a plurality of steps. One end of each stringer is fixedly connected to the concrete floor, and after the other end extends downward or upward, it is fixedly connected to another concrete floor. The upper side surface of the stringer is stepped, and its lower side surface is an inclined plane that slopes upward or downward. The steps are located between the two stringers and are distributed along the length direction of the stringers. Both ends of each step are fixedly connected to the two stringers respectively. Each step includes a bottom sheet steel mesh and a plurality of L-shaped steel bars located above the bottom sheet steel. The bottom sheet steel mesh includes a plurality of long bars and a plurality of short bars. Among them, the plurality of long bars are arranged in parallel with each other, the plurality of short bars are spaced along the length direction of the long bars, and the long bars and the short bars are fixedly connected to each other to form a mesh structure. The L-shaped steel bars are located at both ends in the length direction of the long bars and have a long end and a short end. The long end of the L-shaped steel bar is fixedly connected to the same long bar, so that the long ends of the plurality of L-shaped steel bars are located in the same plane. The short end of the L-shaped steel bar is fixedly connected to another long bar, so that the L-shaped steel bar and the bottom sheet steel mesh enclose a triangle. At the same time, the plane where the L-shaped steel bar is located is perpendicular to the plane where the bottom sheet steel mesh is located, and the planes where two adjacent L-shaped steel bars are located are parallel to each other. The plane where the bottom sheet steel mesh is located is parallel to the inclined plane of the stringer. Concrete is poured outside the bottom sheet steel mesh and the L-shaped steel bars so that they are wrapped by the concrete, and the upper side surface of the concrete is flush with the upper side surface of the stringer, thereby forming a plurality of steps. A fixing member is respectively provided at both ends of the stringer, and the fixing member is fixedly connected to the stringer. The stringer is fixedly connected to the concrete floor through the bottom end of the fixing member.

[0006] Preferably, the two right-angled sides of each step are a long side and a short side respectively. One side opposite to the long side has a plane I, and one side opposite to the short side has a plane II. There is a gap between the plane I of one step and the plane II of the adjacent step. The size of the gap is not more than 10 mm.

[0007] Preferably, a plurality of embedded sleeves are respectively provided at both ends of the step. The sleeves extend into the step and are located below the long end of the L-shaped steel bar and are perpendicular to the plane where the L-shaped steel bar is located. The outer side of the sleeve is fixedly connected to the L-shaped steel bar. A plurality of connection holes are provided at the positions corresponding to the steps on the stringer. After a countersunk head bolt passes through the connection hole and extends into the sleeve, the step is fixedly connected to the stringer, and the top end of the countersunk head bolt is flush with the outer side surface of the stringer.

[0008] Preferably, both ends of the stringer extend horizontally to form connection ends, and the upper side surface of the connection ends is flush with the upper side surface of the adjacent step. The fixing member is located on the side of the stringer facing the step and is fixedly connected to the connection end.

[0009] Preferably, the side of the concrete floor connected to the ladder beam is recessed downward to form a corbel, and the fixing piece is placed above the corbel, with its bottom end fixedly connected to the corbel, so that the upper surface of the fixing piece is flush with the upper surface of the concrete floor and the upper surface of the adjacent step.

[0010] Preferably, an anchor bolt is provided between the fixing part and the concrete floor. The anchor bolt is L-shaped, one end of which passes through the concrete floor, extends upward from the bottom of the fixing part into the fixing part, and is fixedly connected to the fixing part through a nut, and the other end of the anchor bolt is buried in the concrete floor, so that the fixing part is fixedly connected to the concrete floor.

[0011] Preferably, an opening is provided at the bottom of the fixing member, the diameter of the opening being larger than the diameter of the anchor bolt; and a hoisting hole is provided on the side of the fixing member away from the step for hoisting the assembled steel-concrete combination staircase.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The utility model uses pre-buried sleeves and bolts to connect triangular precast concrete standard steps with steel ladder beams to form an assembled steel-concrete composite staircase, which gives full play to the combined effect of steel and concrete. Compared with steel stairs, it reduces the amount of steel used and reduces material costs; compared with fully precast concrete stairs, it reduces its own weight and reduces transportation and hoisting costs.

[0014] 2. The utility model leaves a joint between each triangular precast concrete standard step. On the one hand, the standard step can be adapted to different stair heights through the method of "fixed step height + adjustable gap size", thereby standardizing the steps; on the other hand, the installation allowable error is large and the installation is convenient; finally, the gap is filled with anti-cracking mortar to prevent cracking during later use.

[0015] 3. The utility model is designed with standardized steps, which can be manufactured through standardized molds, can be reused for a long time, and are simple to manufacture, thereby reducing production costs. At the same time, the triangular cross-section of the steps can make the bottom of the stairs flat, thereby eliminating the cost of secondary decoration of the bottom. In addition, the triangular steps are thick enough to facilitate the connection of the railings to the steps through expansion bolts.

[0016] 4. The utility model opens a tapered hole on the side of the ladder beam, and the standard step is connected to the ladder beam through a countersunk bolt and a sleeve embedded inside the step, so that the bolt is flush with the surface of the ladder beam, avoiding the exposure of ordinary bolts and affecting the appearance; L-shaped steel bars are arranged at the end of the step and fixedly connected with the embedded sleeve, thereby enhancing the force on the end of the step. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic structural diagram of an assembled steel-concrete composite staircase based on triangular standard steps of the present utility model.

[0018] Figure 2 This is a schematic structural diagram after the bottom film steel bar mesh and L-shaped steel bars are connected.

[0019] Figure 3 This is a schematic structural diagram of the step.

[0020] Figure 4 This is a schematic structural diagram of the gap position.

[0021] Figure 5 This is a schematic structural diagram after the ladder beam is connected to the fixing member.

[0022] Figure 6 For Figure 5 The schematic diagram in the A-A direction in

[0023] Figure 7 This is a schematic structural diagram of the sleeve, connection hole and ladder beam.

[0024] Figure 8 This is a schematic structural diagram of the connection end on the ladder beam.

[0025] In the figure: ladder beam 1, concrete floor 2, L-shaped steel bar 4, long steel bar 5, short steel bar 6, fixing member 7, plane I 8, plane II 9, sleeve 10, connection hole 11, connection end 12, corbel 13, anchor bolt 14, nut 15. Detailed implementation manners

[0026] The present utility model will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the present utility model belong to the scope of protection of the present utility model.

[0027] The present utility model provides an assembled steel-concrete composite staircase based on triangular standard steps. As Figures 1 - 8 shown, it includes two ladder beams 1 and a plurality of steps. One end of the ladder beam is fixedly connected to the concrete floor 2, and after the other end extends downward or upward, it is fixedly connected to another concrete floor. The upper surface of the ladder beam is stepped, and its lower surface is an inclined plane that slopes upward or downward. The steps are located between the two ladder beams and are distributed along the length direction of the ladder beam. The two ends of the steps are respectively fixedly connected to the two ladder beams. Compared with a staircase with a straight ladder beam, the stepped ladder beam fits well with the staircase steps, solving the problems of increased cost and construction period caused by the need for secondary decoration of the straight ladder beam. The steps include a bottom film steel bar mesh and a plurality of L-shaped steel bars 4 located above the bottom film, as Figure 2and Figure 3 as shown. The bottom plate steel bar mesh includes a plurality of long steel bars 5 and a plurality of short steel bars 6. Among them, the plurality of long steel bars are arranged parallel to each other, the plurality of short steel bars are distributed at intervals along the length direction of the long steel bars, the length direction of the long steel bars is perpendicular to the length direction of the short steel bars, and the long steel bars and the short steel bars are fixedly connected to each other to form a net structure. The L-shaped steel bars are located at both ends of the length direction of the long steel bars and have a long end and a short end. The long end of the L-shaped steel bar is fixedly connected to the same long steel bar, so that the long ends of the plurality of L-shaped steel bars are located in the same plane. The short end of the L-shaped steel bar is fixedly connected to another long steel bar, so that the L-shaped steel bar and the bottom plate steel bar mesh enclose a triangle. At the same time, the plane where the L-shaped steel bar is located is perpendicular to the plane where the bottom plate steel bar mesh is located, and the planes where two adjacent L-shaped steel bars are located are parallel to each other. The plane where the bottom plate steel bar mesh is located is parallel to the inclined surface of the ladder beam. Concrete is poured outside the bottom plate steel bar mesh and the L-shaped steel bars. The concrete completely wraps the bottom plate steel bar mesh and the L-shaped steel bars, and the upper surface of the concrete is flush with the upper surface of the ladder beam. The lower surface of the concrete forms an inclined surface that slopes downward or upward, and the plane where the inclined surface is located is parallel to the inclined surface of the ladder beam, thereby forming a plurality of steps. In other words, a plurality of triangles are respectively enclosed at both ends of the length direction of the bottom plate steel bar mesh. Looking from the length direction of the bottom plate steel bar mesh, these plurality of triangles overlap, as Figure 2 shown. Such triangular steps make the bottom of the stairs flat and do not require sealing plate treatment, solving the problem that the bottom of the existing steel stairs is uneven and thus requires secondary decoration, thereby increasing the cost and construction period. At the same time, the thickness of the triangular steps is sufficient, providing conditions for the prefabricated railing to be connected to the steps through expansion bolts, and solving the problem of on-site connection of the prefabricated railing. A fixing member 7 is respectively provided at both ends of the ladder beam, and the fixing member is fixedly connected to the ladder beam. The ladder beam is fixedly connected to the concrete floor through the bottom end of the fixing member.

[0028] In some embodiments, the two right-angled sides of the step are respectively a long side and a short side. One side opposite to the long side has a plane I 8, and one side opposite to the short side has a plane II 9, as Figure 3 shown; there is a gap 18 between the plane I of one step and the plane II of the adjacent step, as Figure 4As shown; the size of the gap is not more than 10 mm, and this size refers to the width of the gap, that is: the straight-line distance between Plane I and Plane II. In this embodiment, setting Plane I and Plane II provides sufficient space for the position adjustment of the step and is also convenient for manual operation. And the set size of the gap is adjustable, and the setting of this gap has three functions: First, by means of "fixed step height + adjustable gap size", this standard step can adapt to different staircase heights, thus standardizing the steps; Second, it allows a large installation error for the steps, facilitating the installation by construction workers; Third, since the lower surface of the staircase in the prior art will crack during later use, the present utility model specifically sets a gap between two adjacent steps and fills anti-cracking mortar at the gap, which can effectively prevent the lower surface of the staircase from cracking during later use. At both ends of the step, a plurality of embedded sleeves 10 are respectively provided. The sleeves extend into the step and are located below the long end of the L-shaped steel bar and perpendicular to the plane where the L-shaped steel bar is located. The outer side of the sleeve is fixedly connected to the L-shaped steel bar; at the position of the ladder beam corresponding to the step, a plurality of connection holes 11 are provided, as Figure 7 shown. The connection hole is conical. After the countersunk head bolt passes through the connection hole and extends into the sleeve, the step is fixedly connected to the ladder beam, and the top end of the countersunk head bolt is flush with the outer surface of the ladder beam. The standard step is connected to the ladder beam through the countersunk head bolt and the sleeve embedded in the inner side of the step, making the countersunk head bolt flush with the surface of the ladder beam, avoiding the exposure of ordinary bolts and thus affecting the appearance; L-shaped end reinforcing bars are provided at the ends of the step and are fixedly connected to the embedded sleeves, enhancing the force-bearing capacity at the ends of the step.

[0029] In some embodiments, both ends of the ladder beam respectively extend horizontally to form connection ends 12, as Figure 8 shown. The upper surface of the connection end is flush with the upper surface of the adjacent step; the fixing member is located on the side of the ladder beam facing the step and is fixedly connected to the connection end.

[0030] In some embodiments, a corbel 13 is formed by the side of the concrete floor connected to the ladder beam being recessed downward. The fixing member is placed above the corbel, and its bottom end is fixedly connected to the corbel, making the upper surface of the fixing member flush with the upper surface of the concrete floor and the upper surface of the adjacent step.

[0031] In some embodiments, as Figures 5 - 6As shown, an anchor bolt 14 is provided between the fixing member and the concrete floor. The anchor bolt is L-shaped. After one end of the anchor bolt passes through the concrete floor, it extends upward from the bottom of the fixing member into the fixing member and is fixedly connected to the fixing member through a nut 15. The other end of the anchor bolt is buried in the concrete floor so that the fixing member is fixedly connected to the concrete floor. An opening 16 is provided at the bottom of the fixing member. The aperture of the opening is larger than the diameter of the anchor bolt, so that the fixing member can be adjusted in the left and rear front and rear positions. The installation tolerance is large, which is convenient for construction personnel to install quickly. A hoisting hole 17 is provided on the side of the fixing member away from the step for hoisting the assembled steel-concrete composite staircase. In the prior art, hoisting holes are generally provided on the step or on the side of the ladder beam for hoisting. When the hoisting holes are provided on the step, the construction process is increased, affecting the standardized generation of the step; when the hoisting holes are provided on the side of the ladder beam, if the staircase is installed on one side of the shear wall, since the gap between the staircase and the shear wall is generally only 10 mm, this will cause the hoisting holes on the step to be unusable, thereby affecting the hoisting of the staircase. Therefore, the utility model sets the hanging hole on the side of the fixing member away from the step, as shown in the figure, which can well solve the above problem. In actual implementation, a baffle can be set above the fixing member, which can completely cover the gap between the fixing member and the concrete floor, and the gap between the fixing member and the step, and can be kept flush with the concrete floor, so as to play a waterproof role in these gaps.

[0032] The present invention is not limited to the above-mentioned implementation modes, and any structure that is the same or similar to the above-mentioned embodiments of the present invention is within the protection scope of the present invention.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution should be included in the scope of the claims of the utility model.

Claims

1. An assembled steel-concrete composite staircase based on triangular standard steps, comprising two ladder beams (1) and a plurality of steps, characterized in that: One end of the ladder beam is fixedly connected to the concrete floor (2), and the other end thereof is fixedly connected to another concrete floor after extending downward or upward; the upper surface of the ladder beam is in the shape of a step, and the lower surface thereof is an inclined surface inclined upward or downward; the step is located between the two ladder beams and distributed along the length direction of the ladder beams, and the two ends of the step are respectively fixedly connected to the two ladder beams; The step comprises a bottom plate steel mesh and a plurality of L-shaped steel bars (4) located above the bottom plate steel bars; the bottom plate steel mesh comprises a plurality of long bars (5) and a plurality of short bars (6), wherein the plurality of long bars are arranged parallel to each other, the plurality of short bars are spaced apart along the length direction of the long bars, and the long bars and the short bars are fixedly connected to each other to form a mesh structure; The L-shaped steel bars are located at both ends of the long steel bar in the length direction and have a long end and a short end. The long end of the L-shaped steel bar is fixedly connected to the same long steel bar, so that the long ends of multiple L-shaped steel bars are located in the same plane; the short end of the L-shaped steel bar is fixedly connected to another long steel bar, so that the L-shaped steel bar and the bottom steel bar mesh are enclosed to form a triangle. At the same time, the plane where the L-shaped steel bar is located is perpendicular to the plane where the bottom steel bar mesh is located, and the planes where two adjacent L-shaped steel bars are located are parallel to each other; the plane where the bottom steel bar mesh is located is parallel to the inclined surface of the ladder beam; concrete is poured on the outside of the bottom steel bar mesh and the L-shaped steel bar so that they are wrapped by concrete, and the upper side surface of the concrete is flush with the upper side surface of the ladder beam, thereby forming multiple steps; A fixing member (7) is provided at each end of the ladder beam, the fixing member being fixedly connected to the ladder beam, and the ladder beam being fixedly connected to the concrete floor through the bottom end of the fixing member; The two right-angled sides of the step are respectively a long side and a short side, the side opposite to the long side has a plane I (8), and the side opposite to the short side has a plane II (9); there is a gap (18) between the plane I of a step and the plane II of the adjacent step; the size of the gap is no more than 10 mm; A plurality of sleeves (10) are respectively provided at both ends of the step, the sleeves extending into the step and being located at the lower side of the long end of the L-shaped steel bar and perpendicular to the plane where the L-shaped steel bar is located, and the outer side of the sleeves is fixedly connected to the L-shaped steel bar; a plurality of connection holes (11) are provided at positions on the ladder beam corresponding to the step, and countersunk bolts are passed through the connection holes and then extend into the sleeves to fix the step to the ladder beam, and the top ends of the countersunk bolts are flush with the outer surface of the ladder beam.

2. The assembled steel-concrete composite staircase according to claim 1, characterized in that: Both ends of the ladder beam extend in the horizontal direction to form connecting ends (12), and the upper surface of the connecting end is flush with the upper surface of the adjacent step; the fixing member (7) is located on the side of the ladder beam facing the step and is fixedly connected to the connecting end.

3. The assembled steel-concrete composite staircase according to claim 1 is characterized in that: The side of the concrete floor connected to the ladder beam is recessed downward to form a corbel (13), and the fixing piece is placed above the corbel, with its bottom end fixedly connected to the corbel, so that the upper surface of the fixing piece is flush with the upper surface of the concrete floor and the upper surface of the adjacent step.

4. The assembled steel-concrete composite staircase according to claim 1, characterized in that: An anchor bolt (14) is provided between the fixing piece and the concrete floor. The anchor bolt is L-shaped, one end of which passes through the concrete floor and extends upward from the bottom of the fixing piece into the fixing piece, and is fixedly connected to the fixing piece via a nut (15). The other end of the anchor bolt is embedded in the concrete floor, so that the fixing piece is fixedly connected to the concrete floor.

5. The assembled steel-concrete composite staircase according to claim 4 is characterized in that: An opening (16) is provided at the bottom of the fixing piece, the diameter of the opening being larger than the diameter of the anchor bolt; and a hoisting hole (17) is provided on a side of the fixing piece away from the step, for hoisting the assembled steel-concrete combination staircase.

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