pedal and び phase

Abstract

To provide treads and the like that can prevent corrosion of reinforcing materials and prevent insufficient strength. [Solution] The step board 5A according to the present invention is a step board comprising a rectangular molded cement board 51, a reinforcing material 52, and a moisture intrusion prevention material (backup material 81, 82, sealing agent 83), wherein the molded cement board 51 has a plurality of hollow portions 53 that are continuous across the left and right end faces and are provided at predetermined intervals along the front-rear direction of the molded cement board 51, the reinforcing material 52 is formed to a length shorter than the length of the hollow portions 53 formed in the molded cement board 51 and is installed in one or more hollow portions 53, and the moisture intrusion prevention material is provided between the outer peripheral surface 52s of the end of the reinforcing material 52 installed in the hollow portion 53 and the inner peripheral surface 53u of the end of the hollow portion 53.

Description

Technical Field

[0003] ,

[0001] The present invention relates to a tread board and a staircase provided with the tread board.

Background Art

[0002] There is known a staircase configured to include left and right girders (hereinafter referred to as "sasara girders") provided so as to extend obliquely in the vertical direction, a tread board provided at a predetermined interval along the vertical inclination direction between the left and right sasara girders, and a kicking board provided between the rear end side of the lower tread board and the front end side of the upper tread board (see Patent Document 1). Patent Document 1 discloses a tread board configured by inserting a metal pipe as a reinforcing material into a hollow portion of a formed cement board.

Prior Art Documents

[0007] [Figure 1] An exploded perspective view showing the configuration of the lower end of the stairs (Embodiment 1). [Figure 2] Cross-sectional view of the tread and riser at the lower end of the stairs (Embodiment 1). [Figure 3] (a) is a cross-sectional view of the tread and riser at the lower end of the stairs, and (b) is a perspective view of the mounting means (Embodiment 2). [Figure 4] (a) is a perspective view showing the relationship between the lowest kick plate and the mounting means, and (b) and (c) are front views of the mounting means (Embodiment 4). [Figure 5] (a) is a perspective view showing the lowest step of the stairs, and (b) is an explanatory diagram showing the mounting method of the mounting means (Embodiment 5). [Figure 6] (a) is an exploded perspective view of the tread, (b) is a perspective view of the tread, (c) is a cross-sectional view showing the end structure of the tread, and (d) is a cross-sectional view of the tread (Embodiment 6). [Figure 7] (a) is an exploded perspective view of the tread, (b) is a perspective view of the tread, (c) is a cross-sectional view showing the end structure of the tread, and (d) is a cross-sectional view of the tread (Embodiment 6). [Modes for carrying out the invention]

[0008] Embodiment 1 As shown in Figures 1 and 2, the stairs 1 according to Embodiment 1 are configured such that the lower ends 2E, 2E of the left and right stringers 2, 2, which are provided to extend in an inclined direction in the vertical direction, are fixed to the foundation 3, and a plurality of treads 5 and risers 6 are provided between the left and right stringers 2, 2 in a continuous vertical and diagonal direction, and a floor slab 4 is constructed on top of the foundation 3, with the lowest riser 6E being attached to the stringers 2, 2 via mounting means 7. The stairs in question 1 are, for example, stairs for outdoor use. In this specification, up, down, left, right, front, and back are defined and explained as the directions shown in Figures 1 and 2. Furthermore, hatching has been omitted in the cross-sectional view shown in Figure 2.

[0009] The construction of the stairs 1 according to Embodiment 1 is carried out, for example, by the following procedure. (1) Attach the upper ends of the left and right stringers 2,2 to the girders of the landings, corridors, etc., which have been constructed earlier and are not shown in the diagram. (2) Install stringer reinforcing members 7A that are continuous between the left and right stringers 2,2 in the designated positions, and install the necessary number of stringer reinforcing members 7B in the designated positions. That is, install stringer reinforcing members 7A which function as stringer reinforcing members on the lowest level and also function as mounting means 7 for attaching the lowest riser board 6E, and then install the necessary number of stringer reinforcing members 7B in the designated positions. (3) A stringer level adjustment plate 22 is provided below the base plate 21 which is provided at the lower end 2E of the stringer 2. Level adjustment bolts 23 provided on the stringer level adjustment plate 22 are passed through holes formed in the base plate 21. Adjustment nuts 24, 24 are screwed onto the bolts 23 so that they are positioned above and below the through holes. (4) After adjusting the level of the left and right stringers 2, 2 by adjusting the level of the base plate 21 using the adjustment nuts 24, 24, the stringer level adjustment plate 22 is fixed to the foundation concrete 3 using anchor bolts or the like (not shown in the figure). (5) Attach tread mounting members 50, 50… for attaching the treads 5 of each step to the inner surfaces 2u, 2u of the left and right stringers 2, 2. (6) The work of installing the treads 5 and risers 6, 6E is carried out. For example, first the lowest tread 5 is installed on the left and right tread mounting members 50, 50. Then, the work of installing the upper risers 6 and the upper treads 5 facing upwards and installing the upper treads 5 on the upper tread mounting members 50, 50 is repeated in sequence. In other words, each tread 5, 5... is installed on both the left and right ends via the tread mounting members 50, 50 to the left and right stringers 2, 2. That is, the tread mounting members 50, 50... are installed corresponding to the installation positions of each tread 5, 5... on the inner surfaces 2u, 2u of the left and right stringers 2, 2, and the treads 5 are installed on the tread mounting members 50. Also, attach the bottom kick plate 6E. (7) Pour concrete floor slab on top of foundation 3, and complete floor slab 4 by plastering the surface.

[0010] The stringer beam 2 is composed of, for example, a side plate 2a formed to rise vertically from the foundation 3 and then extend inclined upward, a front plate 2b provided to extend laterally from the front edge of the side plate 2a, and a rear plate 2c provided to extend laterally from the rear edge of the side plate 2a. In the left stringer beam 2, the front plate 2b and rear plate 2c are formed to extend to the left, while in the right stringer beam 2, the front plate 2b and rear plate 2c are formed to extend to the right.

[0011] It is preferable to use the tread plates 5, 5... of each section, which are composed of, for example, a formed cement plate 51 formed in a rectangular plate shape and a reinforcing member 52. The formed cement plate 51 has, for example, a configuration in which a plurality of hollow portions 53 having a circular cross section that are continuous across the left and right end faces are provided at predetermined intervals along the front-rear direction of the formed cement plate 51. The reinforcing member 52 is, for example, a metal pipe such as a steel pipe having a circular cross section. The tread plate 5 is configured such that the reinforcing member 52 is installed in one or more hollow portions 53 formed in the formed cement plate 51. That is, since the formed cement plate 51 is vulnerable to impact loads and may be damaged depending on the usage method, the reinforcing member 52 is installed inside the formed cement plate 51 for reinforcement, thereby improving the impact load resistance and configuring the tread plate 5 so that the formed cement plate 51 does not fall off even if it is damaged.

[0012] The tread plate mounting member 50 is fixed to the inner surfaces 2u, 2u of the side rails 2, 2 that are opposite surfaces on the side plates 2a, 2a of the left and right side rails 2 by fixing means F1 such as bolts and nuts. The tread plate mounting member 50 is a member installed to extend in the front-rear direction on the inner surface 2u of the side rail 2, and is composed of, for example, a so-called angle member having an L-shaped cross section including a vertical plate portion 50a fixed to the inner surface 2u of the side rail 2 by fixing means F1 and a horizontal plate portion 50b on which the tread plate 5 is placed and fixed.

[0013] The tread plate 5 is fixed to the horizontal plate portion 50b of the tread plate mounting member 50 by fixing means F2. The fixing means F2 is composed of, for example, a plate nut 54 installed in one or more of the hollow portions 53 formed in the formed cement plate 51, a bolt through hole formed in a buffer plate such as a packing P laid on the horizontal plate portion 50b of the tread plate mounting member 50 and the upper surface of the horizontal plate portion 50b, and a bolt 55 that passes through the bolt through hole formed so as to reach the lower surface of the cement plate 51 and the hollow portion 53 and is screwed to the plate nut 54. That is, a bolt 55 inserted through a bolt-through hole from below the horizontal plate portion 50b of the tread mounting member 50 attached to the inner surface 2u of the slat column 2 is screwed onto the plate nut 54, thereby fixing the tread 5 to the tread mounting member 50.

[0014] The slat column reinforcing members 7A, 7B... are provided, for example, so as to be continuous between the left and right slat columns 2, 2. One end is fixed to the inner surface 2u of the left slat column 2 by fixing means F3 such as bolts and nuts, and the other end is fixed to the inner surface 2u of the right slat column 2 by fixing means F3 such as bolts and nuts. The slat column reinforcing members 7A, 7B... are a so-called angle member, which is a long member having a cross-sectional L-shape composed of a horizontal plate 7a formed to have a length continuous between the left and right slat columns 2, 2 and a vertical plate 7b extending downward from the front edge of the horizontal plate 7a, and mounting plates 7c, 7c provided at both left and right ends of the angle member and having surfaces facing the inner surfaces 2u, 2u of the left and right slat columns 2, 2. That is, the slat column reinforcing members 7A, 7B... are members having a configuration without the groove portion 7d of the slat column reinforcing member 7AX described later shown in FIG. 3(b). That is, in the first embodiment, the slat column reinforcing member 7A provided so as to be continuous between the left and right slat columns 2, 2, with one end attached to the inner surface 2u of the left slat column 2 and the other end attached to the inner surface 2u of the right slat column 2, is used as the attachment means 7.

[0015] Conventionally, the lowermost slat column reinforcing member 7B was provided at the position indicated by the dotted line in FIG. 2. However, in the configuration of the first embodiment, the lowermost slat column reinforcing member 7A is moved and provided so as to be positioned forward of the position of the slat column reinforcing member 7B indicated by the dotted line in FIG. 2 and above the planned surface 4f of the earth finish, so that it also functions as the attachment means 7 for attaching the lower end 6e side of the lowermost kicking plate 6E. That is, a gap is provided between the lower end 7r of the lowermost slat column reinforcing member 7A and the planned surface 4f of the earth concrete 4 for finishing.

[0016] The risers 6, except for the bottom one, are made of rectangular steel plates or the like, formed to correspond to the size of the rectangular opening space enclosed by the upper surface of the lower step tread 5, the lower surface of the upper step tread 5, and the inner surfaces 2u, 2u of the left and right stringers 2, 2. The installation of the kick plates 6 other than the bottom one can be done, for example, as follows: After fitting the lower end 6e side of the riser board 6 into the lower end fitting groove 56, which is formed to extend between the left and right end faces of the lower step 5 attached to the step mounting members 50, 50 at the upper rear end of the step 5, the upper end 6t side of the riser board 6 is fitted into the upper end fitting groove 57, which is formed to extend between the left and right end faces of the upper step 5 at the lower front end of the step 5. Subsequently, by attaching the upper step 5 to the step mounting members 50, 50, the riser board 6 is installed between the upper rear end of the step 5 and the lower front end of the step 5.

[0017] The lowest riser board 6E is made of a rectangular steel plate or similar material formed to correspond to the rectangular opening space enclosed by the underside of the lowest tread board 5, the inner surfaces 2u,2u of the left and right stringers 2,2 and the finished surface 4f of the floor concrete. The installation of the bottom kick plate 6E can be done, for example, as follows: The upper end 6t of the lowest step riser board 6E is fitted into the upper end fitting groove 57, which is formed on the front underside of the lowest step tread board 5 and extends between the left and right end faces of the tread board 5. Then, the lower end 6e of the lowest step riser board 6E is brought into contact with the plate surface (front) of the vertical plate 7b of the stringer reinforcement member 7A, which is a mounting member 7 fixed to the inner surfaces 2u, 2u of the left and right stringers 2, 2. Finally, the lower end 6e of the lowest step riser board 6E is fixed to the vertical plate 7b of the stringer reinforcement member 7A using fixing means F4 such as screws. As described above, a staircase 1 is constructed in which the lowest riser board 6E is placed between the lowest step board 5 and the planned finished surface 4f of the earthen floor 4.

[0018] According to the first embodiment of the staircase 1, the lower ends 2E, 2E of left and right stringers 2, 2, which are provided to extend inclined in the vertical direction, are fixed to the foundation 3, and treads 5 and risers 6 are provided between the left and right stringers 2, 2, and a floor 4 is constructed on top of the foundation 3. The lowest riser 6E is provided between the lowest tread 5 and the planned finished surface 4f of the floor 4, and the lowest riser 6E is attached to the left and right stringers 2, 2 via stringer reinforcing members 7A as mounting means 7. This configuration makes it possible to provide a staircase 1 equipped with a lowest riser 6E. In other words, it is possible to obtain a staircase 1 for outdoor use that can distribute the load when an excessive load is applied to the lowest tread 5, thereby preventing damage to the lowest tread 5. Furthermore, since the installation of the bottom riser board 6E can be carried out even if the concrete floor 4 is not yet finished, even in the case of stairs where the concrete floor 4 is constructed on top of the foundation 3 after the construction of the staircase body, the bottom riser board 6E can be attached to the left and right stringers 2,2 via the stringer reinforcement material 7A which serves as the attachment means 7, thereby enabling the construction of stairs 1 equipped with the bottom riser board 6E. Furthermore, since the lower end 7r of the stringer beam reinforcement member 7A, which serves as the mounting means 7, is positioned above the planned finishing surface 4f of the floor slab 4, there is no longer a stringer beam reinforcement member 7B that is positioned below the planned finishing surface 4f of the floor slab 4, as shown by the dotted line in Figure 2. This also has the effect of making plastering work easier during floor slab construction. Furthermore, since the stringer girder reinforcement 7A, which is used by changing the installation position of the existing stringer girder reinforcement 7B, can be used as the mounting means 7, there is no need to newly design and manufacture parts for the mounting means 7, thus improving cost performance. Furthermore, as shown in Figure 2, if the planned finished surface 4f of the floor 4 is set lower than the lower end 6e of the lowest riser board 6E fixed to the stringer beam reinforcement member 7A (mounting means 7), and the floor 4 is constructed in such a way that the lower end 6e of the lowest riser board 6E is not embedded in the floor 4, then if the riser board 6E becomes damaged or otherwise needs to be replaced, the replacement work of the riser board 6E can be easily carried out. Alternatively, the planned finished surface 4f of the floor 4 may be set slightly above the lower end 6e of the lowest riser board 6E, which is fixed to the stringer beam reinforcement 7A (mounting means 7), and the floor 4 may be constructed so that the lower end 6e of the lowest riser board 6E is embedded in the floor 4.

[0019] Embodiment 2 In Embodiment 1, a configuration in which a stringer girder reinforcement member 7A is used as the mounting means 7 is illustrated. However, as shown in Figure 3, a stringer girder reinforcement member 7AX having a groove portion 7d with a concave cross-section on the lower end side 7s of the vertical plate 7b of the stringer girder reinforcement member 7A may also be used as the mounting means 7. As the stringer beam reinforcement member 7AX, a vertical plate 7b and a groove 7d may be formed integrally, or a groove 7d formed separately from the vertical plate 7b may be joined to the lower end side 7s of the vertical plate 7b by welding or the like. Note that hatching has been omitted in the cross-sectional view of Figure 3(a).

[0020] When a stringer reinforcement member 7AX is used as the mounting means 7, the lower end 6e side of the lowest riser board 6E is fitted into the groove 7d of the stringer reinforcement member 7AX, then the lowest step board 5 is installed, and the upper end 6t side of the riser board 6E is fitted into the upper end fitting groove 57 of the step board 5. After that, the upper step board 5 is attached to the step board mounting members 50, 50, thereby attaching the lowest riser board 6E to the left and right stringers 2, 2 via the stringer reinforcement member 7AX. Furthermore, while it is acceptable to simply fit the lower end 6e of the lowest riser board 6E into the groove 7d of the stringer reinforcement 7AX, it is also possible to use screws or other fastening means to fix the lower end 6e of the lowest riser board 6E into the groove 7d and then secure the lower end 6e to the vertical plate 7b of the stringer reinforcement 7AX.

[0021] According to Embodiment 2, the same effects as Embodiment 1 can be obtained, and since the stringer beam reinforcement member 7AX is equipped with a groove 7d, the lowest riser board 6E will not fall during work, making the installation of the riser board 6E easier. In other words, since the stringer beam reinforcement member 7AX equipped with a groove 7d is used as the installation means 7, the workability of the installation of the riser board 6E can be improved.

[0022] Embodiment 3 In Embodiments 1 and 2, examples were shown in which stringer reinforcing members 7A and 7AX, which are provided to extend continuously between the left and right stringer girders 2, 2, were used as mounting means 7. However, mounting means 7 may also be configured by individually attaching members, each comprising a short angle material with an L-shaped cross-section composed of a horizontal plate and a vertical plate, and a mounting plate provided at one end of the short angle material, to the inner surfaces 2u, 2u of the left and right stringer girders 2, 2.

[0023] Embodiment 4 As shown in Figure 4, the mounting means 7 may be configured by attaching groove members, each having a U-shaped cross-section groove that is continuous in the vertical direction, to the inner surfaces 2u, 2u of the left and right stringers 2, 2, respectively. For example, the groove member 7X1 shown in Figure 4(a), the groove member 7X2 shown in Figure 4(b), or the groove member 7X3 shown in Figure 4(c) can be used as the mounting means 7.

[0024] The groove member 7X1 shown in Figure 4(a) comprises a groove bottom plate 7u that serves as a mounting plate for the inner surface 2u of the stringer beam 2, and front and rear vertical groove wall plates 7v, 7v that extend in the same direction from the front and rear edges of the groove bottom plate 7u and are parallel to each other. The spacing between the front and rear vertical groove wall plates 7v, 7v is set to allow the lowest kick plate 6E to be inserted in a fitted state from above. The groove member 7X1 is fixed to a predetermined position on the inner surface 2u of the stringer 2 by fastening means such as screws or welding (not shown) for the groove bottom plate 7u. The side portion 6s of the lowest riser board 6E is then fitted into the vertical groove between the front and rear vertical groove wall plates 7v, 7v, and the lower end of the lowest riser board 6E is fixed to the front vertical groove wall plate 7v or the rear vertical groove wall plate 7v by fastening means such as tapping screws (not shown). After that, the upper end 6t of the lowest riser board 6E is fitted into the upper end fitting groove 57 of the upper tread board 5, and then the upper tread board 5 is attached to the tread board mounting members 50, 50, thereby providing the lowest riser board 6E between the lowest tread board 5 and the planned finished surface 4f of the floor 4.

[0025] The groove member 7X2 shown in Figure 4(b) is equipped with a bottom plate 7e at the lower end of the groove member 7X1. When this groove member 7X2 is used, the lower end of the lowest kick plate 6E, whose side portion 6s is fitted into the vertical groove between the front and rear vertical groove wall plates 7v, 7v, is supported by the bottom plate 7e. When the groove member 7X2 is used as the mounting means 7, the lower end 6e of the lowest kick plate 6E is supported by the bottom plate 7e of the groove member 7X2. Therefore, the lower end 6e side of the lowest kick plate 6E and the front vertical groove wall plate 7v or the rear vertical groove wall plate 7v may be fixed by fixing means such as tapping screws (not shown), or they may not be fixed.

[0026] The groove member 7X3 shown in Figure 4(c) comprises a groove bottom plate 7u which serves as a mounting plate, and front and rear groove wall plates 7w, 7w which extend in the same direction from the front and rear edges of the groove bottom plate 7u and face each other, and is configured such that the distance between the front and rear groove wall plates 7w, 7w gradually decreases as it approaches the lower end from the upper end. The upper end spacing H1 between the front and rear groove wall panels 7w, 7w is set to be larger than the thickness dimension of the bottom riser board 6E, while the lower end spacing H2 between the front and rear groove wall panels 7w, 7w is set to be smaller than the thickness dimension of the bottom riser board 6E. When the groove member 7X3 is used, the lower end 6e of the lowest kick plate 6E, which is inserted between the front and rear groove wall plates 7w, 7w, is supported by the lower ends of the front and rear groove wall plates 7w, 7w. When the groove member 7X3 is used as the mounting means 7, the lower end 6e of the lowest kick plate 6E is supported, so it is not necessary to fix the lower end of the lowest kick plate 6E to the front groove wall plate 7w or the rear groove wall plate 7v with a fixing means such as a tapping screw.

[0027] In other words, according to embodiments 3 and 4 described above, the mounting means 7 is configured to consist of a left mounting means 7 attached to the inner surface 2u of the left stringer 2 and a right mounting means 7 attached to the inner surface 2u of the right stringer 2. This provides the same effect as embodiment 1, while also allowing for miniaturization of the mounting means 7.

[0028] Embodiment 5 In Embodiments 1 to 4, the lowest riser board 6E is shown to be attached via mounting means 7 attached to the stringers 2, 2 before the construction of the floor slab 4 is completed. However, the lowest riser board 6E may also be attached to the floor slab 4 via mounting means 7 attached to the floor slab 4 after the construction of the floor slab 4 is completed.

[0029] As the mounting means 7 used in Embodiment 5, for example, as shown in Figure 5, a rail member 7Y having a concave groove 7m extending in the left-right direction is used. In other words, the rail member 7Y is configured to have a horizontal plate 7h which serves as a mounting plate to the floor 4, and front and rear vertical plates 7i, 7i which extend upward from the front and rear edges of the horizontal plate 7h and are parallel to each other, forming a groove 7m with a concave cross-section surrounded by the horizontal plate 7h and the front and rear vertical plates 7i, 7i. The rail member 7Y may be a rail member with a continuous length spanning between the left and right stringers 2,2, or it may be a multiple rail member intermittently installed between the left and right stringers 2,2. Using multiple rail members intermittently allows for changes in the stair width dimension.

[0030] For example, the rail member 7Y is attached to the floor 4 by fixing the horizontal plate 7h to a predetermined position on the floor 4 using fixing means F6 such as concrete screws. After that, the bolt 55 of the fixing means F2 of the lowest step 5 is loosened, the front end of the lowest step 5 is lifted and the upper end 6t of the lowest riser 6E is fitted into the upper end fitting groove 57, and then the lower end 6e of the lowest riser 6E is inserted into the groove 7m of the rail member 7Y and the lowest step 5 is reattached to the step mounting members 50, 50, thereby providing the lowest riser 6E between the lowest step 5 and the floor 4.

[0031] According to Embodiment 5, in a staircase where the lower ends 2E, 2E of the left and right stringers 2, 2 are fixed to the foundation 3, and treads 5 and risers 6 are provided between the left and right stringers 2, 2, and a floor slab 4 is constructed on top of the foundation 3, the lowest riser 6E is attached to the floor slab 4 via a rail member 7Y as an attachment means 7. Therefore, a staircase 1 with the lowest riser 6E can be obtained after the floor slab 4 has been constructed.

[0032] Embodiment 6 As described above, when a metal pipe serving as a reinforcing material 52 is inserted into the hollow portion 53 of a molded cement board 51 to construct the tread 5, moisture may penetrate into the hollow portion 53 of the molded cement board 51 depending on the external environment and usage conditions, leading to corrosion of the reinforcing material 52 and increasing the likelihood of insufficient strength of the tread 5. Therefore, in Embodiment 6, as shown in Figures 6 and 7, a tread board is used that is equipped with a means to prevent moisture from entering the hollow portion 53 of the molded cement board 51.

[0033] Specifically, in the case of the tread 5A shown in Figure 6, or the tread 5B shown in Figure 7, a metal pipe shorter than the length of the hollow section 53 is used as the reinforcing material 52, and a moisture intrusion prevention material is provided between the outer circumferential surface 52s of the reinforcing material 52 installed in the hollow section 53 and the inner circumferential surface 53u of the hollow section 53, thereby preventing moisture from entering between the outer circumferential surface 52s of the reinforcing material 52 and the inner circumferential surface 53u of the hollow section 53.

[0034] In the tread 5A shown in Figure 6, for example, backing materials 81 and 82 made of foamed polyethylene and a modified silicone-based sealant 83 are used as means to prevent moisture intrusion. As the backup material 81, an annular backup material was used, which was attached so as to cover the outer peripheral surface 52s at the end of the reinforcing material 52. Furthermore, as the backup material 82, a cylindrical or disc-shaped closing backup material was used, which was provided to close the opening at the end of the reinforcing material 52. For example, a reinforced member 52 with backup materials attached is created by closing the openings at both ends of the reinforced member 52 with backup materials 82, 82 for sealing, and attaching annular backup materials 81 so as to cover the outer peripheral surfaces 52s at both ends of the reinforced member 52. Then, the reinforced member 52 with backup materials attached is inserted into a specific hollow section 53 of the cement board 51 (for example, the hollow section located at the foremost end) 53 and installed. After that, a sealant 83 is filled between the openings at both ends of the hollow section 53 in which the reinforced member 52 with backup materials attached is installed and the backup materials 81, 82, thereby completing the tread 5A. In addition, in the cross-sectional views of Figures 6(c) and 6(d), hatching other than that of the backup materials 81 and 82 and the sealant 83 has been omitted.

[0035] The tread 5B shown in Figure 7 is, for example, a tread with semi-fireproof specifications, and in this tread 5B, an epoxy adhesive 84 was used as a means of preventing moisture intrusion. Specifically, the tread 5B was constructed in which adhesive 84 was filled between the outer circumferential surfaces 52s at both ends of the reinforcing material 52 and the inner circumferential surfaces 53u at both ends of the hollow portion 53. Furthermore, as shown in Figure 7(d), the semi-fireproof tread 5B is attached to the tread mounting material 50 by fixing means F2 at two locations, the front and rear of the tread 5B. In the cross-sectional views of Figures 7(c) and 7(d), hatching other than that of the adhesive 84 has been omitted.

[0036] In other words, the footboards 5A and 5B according to Embodiment 6 are composed of a molded cement board 51 formed in the shape of a rectangular plate, a reinforcing material 52, and a moisture intrusion prevention material. Furthermore, the molded cement board 51 has multiple hollow sections 53, for example, with a circular cross-section, which are continuous across the left and right end faces and are provided at predetermined intervals along the front-to-back direction of the molded cement board 51. Reinforcing members 52 are formed to be shorter than the length of the hollow sections 53 formed in the molded cement board 51 and are installed in one or more hollow sections 53. In addition, a moisture intrusion prevention material is provided between the outer peripheral surface 52s of the end of the reinforcing member 52 installed in the hollow section 53 and the inner peripheral surface 53 of the end of the hollow section 53. According to this embodiment 6, it is possible to obtain a staircase 1 equipped with treads 5A and 5B that can prevent corrosion of the reinforcing material 52 and prevent insufficient strength. [Explanation of Symbols]

[0037] 1 stairs 2. Stringer beam (beam) 2E Lower end of stringer beam 2u Inner surface of stringer beam 3 Basics 4. Earthen floor 5A,5B Treadboard 6. Kick plate 6E Bottom kick plate 7. Mounting means 7A, 7AX Reinforcement material for stringer beams (mounting method) 7X1, 7X2, 7X3 groove members (mounting means) 7Y Rail component (mounting means) 51 Molded cement board 52 Reinforcement material 52s End outer surface of reinforcing material 53 Hollow part 53u Inner circumferential surface of the end of the hollow section 81,82 Backup material (moisture intrusion prevention material) 83. Sealant (moisture intrusion prevention material) 84 Adhesives (moisture-proofing materials)

Claims

1. A tread made of a molded cement board formed in the shape of a rectangular plate, a reinforcing material, and a moisture intrusion prevention material, The molded cement board has multiple hollow sections that extend continuously across its left and right end faces, spaced at predetermined intervals along the front-to-back direction of the molded cement board. The reinforcing material is formed to a length shorter than the length of the hollow portion formed in the molded cement board, and is installed in one or more of the hollow portions. The tread is characterized in that the moisture intrusion prevention material is provided between the outer peripheral surface of the end of the reinforcing material installed in the hollow portion and the inner peripheral surface of the end of the hollow portion.

2. The aforementioned moisture intrusion prevention material is A first backup member is attached so as to cover the outer circumferential surface at the end of the reinforcing member, A second backup member is provided to close the opening at the end of the reinforcing member, The first backup material and the second backup material, located at the end of the reinforcing material inserted into the hollow portion of the molded cement board, and a sealing agent filled between the end opening of the hollow portion, The step board according to claim 1, characterized by comprising the features.

3. The aforementioned moisture intrusion prevention material is The tread according to claim 1, characterized in that the adhesive is filled between the outer circumferential surface of the end of the reinforcing material inserted into the hollow portion of the molded cement board and the inner circumferential surface of the end of the hollow portion.

4. A staircase characterized by having a tread plate according to any one of claims 1 to 3 between left and right stringers that are provided to extend in an inclined direction in the vertical direction.

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