Staircase

Abstract

To provide a staircase capable of improving impact resistance strength of footboards.SOLUTION: A staircase according to the present invention is a staircase 1 comprising left and right bridgeboards 2, 2 provided to be inclined and extending in a vertical direction, and a plurality of footboards 5, 5... and a plurality of riser structures 6, 6... between the left and right bridgeboards. The plurality of footboards 5, 5... are mounted on the left and right bridgeboards at predetermined intervals along a vertical inclined direction of the bridgeboards. Each of the plurality of riser structures 6, 6... comprises a riser board 6A provided to extend in the vertical direction between a rear end 5r side of the lower footboard 5 and a front end 5f side of the upper footboard 5, and an upper reinforcement board 6B extending along a lower surface 5b of the upper footboard 5 from an upper end side of the riser board 6A to support the lower surface 5b of the upper footboard 5 while reinforcing the upper footboard 5.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a staircase, and in particular to a reinforcing structure for a tread. [Background technology]

[0002] A staircase is known which is configured with left and right rafters that are arranged to extend at an incline in the vertical direction, treads that are arranged between the left and right rafters at a specified distance in the vertical inclination direction, and a riser that is arranged between the upper surface of the rear end side of the lower tread and the lower surface of the front end side of the upper tread. The tread is made, for example, from a cement extrusion molding, and has lightening holes drilled in the longitudinal direction at predetermined intervals to reduce weight. Metal rod-shaped pipes are inserted into the holes as reinforcing members, thereby reinforcing the tread (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-41729 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional staircase disclosed in the above-mentioned Patent Document 1, the treads are reinforced by pipes provided in the lightening holes of the treads. However, in a structure in which the tread is reinforced by a pipe as in Patent Document 1, there is a possibility that stable strength cannot be obtained due to, for example, the clearance between the diameter of the pipe and the diameter of the lightening hole. In addition, since the pipes are located inside the tread, over a long period of time, condensation and other factors can cause the pipes to rust, weakening the pipes and potentially the tread. In addition, because the pipes are located inside the tread, it is difficult to check the condition of the pipes, such as for rust, making it difficult to determine when the pipes need to be replaced, and the pipe replacement process is complicated, posing issues in terms of maintenance. That is, in the conventional staircase disclosed in Patent Document 1, the structure in which the steps are reinforced by pipes placed inside the steps posed problems in terms of the strength of the steps and maintenance.

[0005] SUMMARY OF THE PRESENT DISCLOSURE In order to solve the above problems, the present invention provides a staircase that can improve the strength of the treads and is easy to maintain. [Means for solving the problem]

[0006] The staircase of the present invention is a staircase comprising left and right trusses arranged to extend at an incline in the vertical direction, and a plurality of treads and a plurality of kick-in structures between the left and right trusses, wherein each of the plurality of treads is arranged at a predetermined interval along the vertical inclination direction of the trusses and attached to the left and right trusses, and each of the plurality of kick-in structures comprises a kick-in plate portion arranged to extend in the vertical direction between the rear end side of the lower tread and the front end side of the upper tread, and an upper reinforcing plate portion extending from the upper end side of the kick-in plate portion along the underside of the upper tread to support the underside of the upper tread and reinforce the upper tread. The lower end of the riser plate is fixed to a fixing groove provided on the rear end side of the upper surface of the lower tread. The left and right girders are further provided with tread mounting portions for mounting treads to the girders, and the upper reinforcing plate portion is positioned between the upper surface of the upper tread mounting portion and the lower surface of the upper tread, and is fixed to the upper tread mounting portion and the upper tread. The kickback structure is further characterized by including a lower reinforcing plate portion extending from the lower end side of the kickback plate portion along the underside of the lower tread to support the underside of the lower tread and reinforce the lower tread. The left and right girders are further provided with tread mounting portions for mounting treads to the girders, and the upper reinforcing plate portion is positioned between the upper surface of the upper tread mounting portion and the lower surface of the upper tread and is fixed to the upper tread mounting portion and the upper tread, and the lower reinforcing plate portion is positioned between the upper surface of the lower tread mounting portion and the lower surface of the lower tread and is fixed to the lower tread mounting portion and the lower tread. According to the present invention, it is possible to provide a staircase that has improved strength of the treads and is easy to maintain. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing a staircase (first embodiment). [Diagram 2] FIG. 2 is an exploded perspective view showing the configuration of the stairs (first embodiment). [Diagram 3] Front view of the staircase (embodiment 1). [Figure 4] AA cross-sectional view of FIG. 3 (longitudinal cross-section of the staircase) (Embodiment 1). [Diagram 5] FIG. 11 is an exploded perspective view showing the configuration of the stairs (embodiment 2). [Figure 6] Longitudinal section of a staircase (embodiment 2). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] EMBODIMENT 1 As shown in Figures 1 to 4, the staircase 1 of embodiment 1 is configured with left and right rafters 2,2 that are arranged to extend at an incline in the vertical direction, and a plurality of treads 5,5... and a plurality of kick-in structures 6,6... between the left and right rafters 2,2. In other words, the steps 5, 5... are installed at each step at a predetermined interval between the left and right rafters 2, 2 in the vertical inclination direction, and a riser structure 6 is installed between the upper step 5 and the lower step 5. The staircase 1 is, for example, an outdoor staircase. In this specification, the terms up, down, left, right, front, and rear are defined as directions shown in the drawings. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 (a vertical cross-sectional view of the stairs), but the hatching of the cross-sectional portion has been omitted.

[0009] As shown in Figure 1, the slatted beam 2 is composed of a side panel 2a that rises vertically from a foundation not shown in the figure and then extends at an upward incline, a front panel 2b that extends laterally from the front edge of the side panel 2a, and a rear panel 2c that extends laterally from the rear edge of the side panel 2a. For example, the left truss beam 2 is formed so that the front panel 2b and the rear panel 2c extend to the left, and the right truss beam 2 is formed so that the front panel 2b and the rear panel 2c extend to the right.

[0010] The left and right columns 2, 2 each have a step mounting portion 3 for mounting a step 5 to the column 2. As shown in Figures 3 and 4, the tread mounting portion 3 is installed on the inner surfaces 2u, 2u of the left and right girders 2, which are the opposing surfaces of the side panels 2a, 2a of the left and right girders 2, and is fixed to the side panels 2a, 2a by fixing means F1 such as bolts and nuts. As shown in Figures 2 and 4, the tread mounting portion 3 is a member installed so as to extend in the front-to-rear direction on the inner surface 2u of the stringer 2, and is composed, for example, of a so-called angle material with an L-shaped cross section, which has a vertical plate 3A installed on the inner surface 2u of the stringer 2 and fixed to the side panel 2a of the stringer 2 by fixing means F1, and a horizontal plate 3B on which the tread 5 is placed and fixed. That is, the tread mounting portion 3 is configured, for example, such that the vertical plate 3A is fixed to the side plate 2a of the stringer 2 by a fixing means F1, and the upper plate surface of the horizontal plate 3B extending from the upper end of the vertical plate 3A forms a horizontal tread support surface extending in the fore-and-aft direction perpendicular to the inner surface 2u of the stringer 2.

[0011] It is preferable to use a tread 5 having a configuration in which a rectangular molded cement board 51 has a plurality of hollow portions 52 extending from the left and right end faces of the molded cement board 51 at predetermined intervals along the front-to-rear direction of the molded cement board 51, as shown in Figure 2, for example. In addition, the step 5 is attached to the left and right girders 2, 2 via the left and right step mounting portions 3, 3. In the present invention, no reinforcing material such as a steel pipe is installed in the hollow portion 52 of the tread 5. By adopting such a configuration, problems such as those in the stairs of Patent Document 1 that arise when the tread is reinforced with a pipe do not occur.

[0012] As shown in Figure 4, the kick structure 6 is composed of a kick plate portion 6A that extends in the vertical direction between the rear end 5r of the lower tread 5 and the front end 5f of the upper tread 5, and an upper reinforcing plate portion 6B that extends from the upper end side of the kick plate portion 6A along the underside 5b of the upper tread 5 to support the underside 5b of the upper tread 5 and reinforce the upper tread 5. The riser portion 6A is composed of a rectangular steel plate or other plate material formed to a size corresponding to the rectangular opening space surrounded by the upper surface 5a of the lower tread 5, the lower surface 5b of the upper tread 5, and the inner surfaces 2u, 2u of the left and right rafters 2, 2. The upper reinforcing plate portion 6B is, for example, made of a panel having a surface large enough to contact at least the front lower surface located forward from the midpoint in the fore-aft direction on the underside 5b of the upper step 5. It is more preferable that the upper reinforcing plate portion 6B be made of a panel having a surface large enough to contact almost the entire surface of the underside 5b of the upper step 5.

[0013] In other words, the kick-in structure 6 is constructed, for example, by bending the front side of a horizontal board, such as a horizontal board, vertically downward, with the upper reinforcing board portion 6B which is the horizontal board portion functioning as a tread reinforcement material, and the lower end 6e side of the kick-in board portion 6A which is the vertical board portion being fixed to a fixing groove 4 provided on the rear end 5r side of the upper surface 5a of the lower tread 5, so that the kick-in board portion 6A is configured to function as a kick-in board. In other words, the riser structure 6 is composed of a steel plate material or the like having an inverted L-shaped cross section, in which an upper reinforcing plate portion 6B that functions as a tread reinforcing material and a riser plate portion 6A that functions as a riser plate are integrated together. That is, when the kick-in structure 6 is installed as described below (see Figure 4), for example, the kick-in plate portion 6A is composed of a plate having a plate surface that forms a vertical plane, and the upper reinforcing plate portion 6B is composed of a plate having a plate surface that forms a horizontal plane.

[0014] The fixing groove 4 is formed by a groove extending continuously between the left and right ends of the tread 5 on the rear edge 5r side of the upper surface 5a of the tread 5, as shown in Figure 2, for example, and the lower end 6e side of the riser plate portion 6A is fixed so as to engage with the fixing groove 4.

[0015] The construction of the staircase 1 according to the first embodiment is carried out, for example, in the following procedure. (1) The upper ends of the left and right girders 2,2 are attached to the girders of a landing, corridor, etc. that have been previously constructed (not shown in the figure), and the lower ends of the left and right girders 2,2 are fixed to the foundation concrete, etc. (not shown in the figure) using anchor bolts, etc. (not shown in the figure). (2) The step mounting portions 3, 3... for mounting the steps 5, 5... of each step are attached to the left and right girders 2, 2 with fixing means F1. The fixing means F1 is composed of, for example, a bolt passing through a bolt hole 3a formed in the vertical plate 3A of the tread mounting portion 3 and a bolt hole (not shown) formed in the side plate 2a of the slat 2, and a nut (not shown) fastened to the tip of the bolt. (3) Next, the lowermost riser structure 6 is installed. That is, the left and right ends of the upper reinforcing plate portion 6B are placed on the horizontal plates 3B, 3B of the lowermost left and right tread mounting portions 3, 3 attached to the left and right girders 2, 2. After that, the lowermost tread 5 is installed on the upper reinforcing plate portion 6B. Then, the upper reinforcing plate portion 6B of the riser structure 6 and the lowermost tread 5 are fixed to the left and right tread mounting portions 3, 3 by the fixing means F2. The fixing means F2 is composed of, for example, a plate nut 53 installed in one or more of the hollow portions 52 formed in the molded cement plate 51 of the tread 5, and a bolt 54 screwed into the plate nut 53 after passing through a bolt hole 3b formed in the horizontal plate 3B of the tread mounting portion 3, a bolt hole 6a formed in the upper reinforcing plate portion 6B, and a tread side bolt hole formed so as to penetrate from the underside 5b side of the molded cement plate 51 into the hollow portion 52. In other words, the kickback structure 6 and the tread 5 are fixed to the tread mounting portion 3 by screwing the bolt 54 into the plate nut 53 through the bolt hole 3b of the horizontal plate 3B of the tread mounting portion 3, the bolt hole 6a of the upper reinforcement plate portion 6B, and the tread side bolt hole of the tread 5 from the underside of the horizontal plate 3B of the tread mounting portion 3 attached to the side panel 2a of the slat 2. In other words, the upper reinforcing plate portion 6B of the riser structure 6 and the upper tread 5 are fastened together to the tread mounting portion 3. (4) Thereafter, in the same manner, starting from the lower step, the riser structure 6 and the tread 5 are fixed to the left and right tread mounting portions 3, 3, thereby completing the construction of the staircase 1. That is, the kick-in structure 6 has the lower end 6e side of the kick-in plate portion 6A fixed to the fixing groove 4 provided on the rear end 5r side of the upper surface 5a of the lower tread 5, and the upper reinforcing plate portion 6B positioned between the upper surface of the horizontal plate 3B of the upper tread mounting portion 3 and the lower surface 5b of the upper tread 5, and is fixed to the horizontal plate 3B of the upper tread mounting portion 3 and the upper tread 5 by the fixing means F2.

[0016] According to the staircase 1 of the first embodiment, it is possible to provide a staircase having improved strength of the treads 5 and excellent maintainability. In other words, the tread 5 is reinforced using a kick structure 6 having an upper reinforcing plate portion 6B that functions as a tread reinforcement material and a kick plate portion 6A that functions as a kick plate, making it possible to provide a staircase that can improve the strength of the tread 5. In addition, since the kickback structure 6 is provided outside the tread 5, it is easy to check the condition of the kickback structure 6 and it is also easy to replace the kickback structure 6, providing a staircase with excellent maintainability. In addition, the upper reinforcing plate portion 6B of the riser structure 6 and the tread 5 are fastened together to the tread mounting portion 3, which further improves the strength of the tread 5 and also improves workability. Furthermore, by using the step 5 having the hollow portion 52, it is possible to provide a staircase in which the step 5 can be made lighter and the strength of the step 5 can be improved.

[0017] In addition, in embodiment 1, a configuration is illustrated in which the lower end 6e side of the kick plate portion 6A of the kick plate structure 6 is fixed to a fixing groove 4 provided on the rear end 5r side of the upper surface 5a of the lower tread 5, but a fixing plate for fixing the lower end 6e side of the kick plate portion 6A to the rear end 5r side of the upper surface 5a of the lower tread 5 may also be provided. In addition, the rear end of the horizontal plate 3B of the tread mounting portion 3 or both front and rear ends of the horizontal plate 3B may be bent. Further, the left and right ends of the horizontal plates 3B of the tread mounting portion 3 may be bent. In addition, both front and rear ends of the vertical plate 3A of the tread mounting portion 3 may be bent, or the flat portion of the vertical plate 3A may be drawn. It is preferable to configure the step board mounting portion 3 as described above, since the strength of the step board 5 fixed to the step board mounting portion 3 can be further improved.

[0018] In addition, in embodiment 1, a configuration is exemplified in which the upper reinforcing plate portion 6B of the kick-in structure 6 and the tread 5 are fastened together to the tread mounting portion 3, but the upper reinforcing plate portion 6B of the kick-in structure 6 may also be fixed directly to the underside 5b of the tread 5.

[0019] EMBODIMENT 2 In the staircase of embodiment 2, as shown in Figures 5 and 6, a kick structure 60 is used which is configured as follows: a kick structure 60A extending in the vertical direction between the rear end 5r of the lower tread 5 and the front end 5f of the upper tread 5, an upper reinforcing plate portion 60B extending from the upper end side of the kick structure 60A along the underside 5b of the upper tread 5 to support the underside 5b of the upper tread 5 and reinforce the upper tread 5, and a lower reinforcing plate portion 60C extending from the lower end side of the kick structure 60A along the underside 5b of the lower tread 5 to support the underside 5b of the lower tread 5 and reinforce the lower tread 5. In addition, in Figs. 5 and 6, the same components as those in the configuration of the first embodiment shown in Figs. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 6 is a vertical cross-sectional view of the staircase of the second embodiment corresponding to FIG. 4 described above, but hatching of the cross-sectional portion is omitted.

[0020] The riser structure 60 is made of a steel plate material or the like having an integral riser plate portion 60A that functions as a riser plate and an upper reinforcing plate portion 60B and a lower reinforcing plate portion 60C that function as tread reinforcements. That is, when the kick-in structure 60 is installed as described below, as shown in Figures 5 and 6, for example, the kick-in plate portion 60A is composed of a plate having a plate surface that forms a vertical plane, the upper reinforcing plate portion 60B extends rearward from the upper end of the kick-in plate portion 60A and is composed of a plate having a plate surface that forms a horizontal plane, and further, the lower reinforcing plate portion 60C extends forward from the lower end of the kick-in plate portion 60A and is composed of a plate having a plate surface that forms a horizontal plane.

[0021] The riser structure 60 is installed, for example, as follows. As shown in Figure 6, the lower reinforcing plate portion 60C is positioned between the upper surface of the horizontal plate 3B of the lower step mounting portion 3 and the lower surface 5b of the lower step 5, and is fixed to the horizontal plate 3B of the lower step mounting portion 3 and the lower step 5 using fixing means F2. Furthermore, the upper reinforcing plate portion 60B is positioned between the upper surface of the horizontal plate 3B of the upper step mounting portion 3 and the lower surface 5 of the upper step 5, and is fixed to the horizontal plate 3B of the upper step mounting portion 3 and the upper step 5 using fixing means F2. In other words, the lower reinforcing plate portion 60C of the kick-in structure 60 and the lower tread 5 are fastened together to the lower tread mounting portion 3 by fixing means F2, and the upper reinforcing plate portion 60B of the kick-in structure 60 and the upper tread 5 are fastened together to the upper tread mounting portion 3 by fixing means F2.

[0022] Furthermore, in the staircase of embodiment 2, the lower end side of the riser portion 60A is positioned rearward of the rear end 5r of the lower step 5 so that the front surface of the lower end side of the riser portion 60A is close to the rear end 5r of the lower step 5. The lower reinforcing plate portion 60C is fixed to the lower step mounting portion 3 and the lower step 5 so as to support the lower surface 5b of the lower step 5. Therefore, in the staircase according to the second embodiment, a tread 5 that does not have a fixing groove 4 is used.

[0023] The staircase 1 according to the second embodiment is configured using the riser structure 60, so that it is possible to provide a staircase that can provide the same effects as those of the first embodiment. In particular, a configuration can be realized in which the lower tread 5 and the upper tread 5 are integrated and reinforced by the kick structure 60, such that the lower reinforcing plate portion 60C of the kick structure 60 reinforces the lower tread 5, and the upper reinforcing plate portion 60B of the kick structure 60 reinforces the lower tread 5, thereby making it possible to provide a staircase in which the strength of the tread 5 can be further improved.

[0024] In addition, in embodiment 2, an example is given of a configuration in which the upper reinforcing plate portion 60B of the kick-in structure 60 and the upper step 5 are fastened together to the upper step mounting portion 3, and the lower reinforcing plate portion 60C of the kick-in structure 60 and the lower step 5 are fastened together to the lower step mounting portion 3. However, it is also possible to fix the upper reinforcing plate portion 60B of the kick-in structure 60 directly to the underside 5b of the upper step 5, and fix the lower reinforcing plate portion 60C of the kick-in structure 60 directly to the underside 5b of the lower step 5.

[0025] Furthermore, if the metal constituting the kick-in structure 6 of embodiment 1 or the kick-in structure 60 of embodiment 2 is different from the metal constituting the tread mounting part 3, for example, if the kick-in structure 6 or the kick-in structure 60 is made of stainless steel and the tread mounting part 3 is made of carbon steel, there is a risk that both will rust due to "galvanic corrosion". Therefore, in the present invention, it is preferable that the riser structure 6, the riser structure 60, and the tread mounting portion 3 are made of the same type of metal.

[0026] Further, in the present invention, the materials, etc. of the riser structures 6, 60 are not particularly limited. The staircase according to the present invention may be an indoor staircase. [Explanation of symbols]

[0027] 1 stairs 2. Saragi 3 Treadle mounting section 4 Fixed groove 5 Treadboard 5a Top of the tread 5b Underside of tread 5f Front end of the tread 5r Rear end of the footboard 6,60 Ridge structure 6A,60A Riser section 6e Lower end of riser 6B, 60B Upper reinforcing plate 60C Lower reinforcement plate part

Claims

1. A staircase comprising left and right girders that are inclined and extended in the vertical direction, and a plurality of treads and a plurality of kick structures between the left and right girders, The plurality of treads are arranged at predetermined intervals along the vertical inclination direction of the slat and are attached to the left and right slats, A staircase characterized in that each of the multiple kick-in structures comprises a kick-in plate portion extending in the vertical direction between the rear end side of the lower step and the front end side of the upper step, and an upper reinforcing plate portion extending from the upper end side of the kick-in plate portion along the underside of the upper step to support the underside of the upper step and reinforce the upper step.

2. 2. The staircase according to claim 1, wherein the lower end of the riser portion is fixed to a fixing groove provided on the rear end side of the upper surface of the tread of the lower step.

3. The left and right girders each include a step mounting portion for mounting a step to the girders, A staircase as described in claim 1 or 2, characterized in that the upper reinforcing plate portion is positioned between the upper surface of the upper step tread mounting portion and the lower surface of the upper step tread, and is fixed to the upper step tread mounting portion and the upper step tread.

4. The staircase described in claim 1, characterized in that the riser structure is provided with a lower reinforcing plate portion extending from the lower end side of the riser plate portion along the underside of the lower step tread to support the underside of the lower step tread and reinforce the lower step tread.

5. The left and right girders each include a step mounting portion for mounting a step to the girders, The upper reinforcing plate portion is positioned between an upper surface of the upper tread mounting portion and a lower surface of the upper tread, and is fixed to the upper tread mounting portion and the upper tread, The staircase according to claim 4, characterized in that the lower reinforcing plate portion is disposed between the upper surface of the lower step tread mounting portion and the lower surface of the lower step tread, and is fixed to the lower step tread mounting portion and the lower step tread.

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