JPH06307044A - Stair - Google Patents

Abstract

PURPOSE:To form a concrete tread so as to be simple and light, and to efficiently attach and fix the tread to an open string. CONSTITUTION:The horizontal plate 2 of a concrete tread 1 is provided with a lattice-shaped reinforcement 10 embedded therein, and nuts 12, 12 are provided so as to front on both the longitudinal ends of the horizontal plate 2. In addition, a standing up plate 3 is longitudinally erected at a deep end on the upper face of the horizontal plate 2, and the top of the standing up plate 3 is provided with a recess groove 4, and a recess groove 8 is longitudially provided at a front end on the lower face of the horizontal plate 3. The tread 1 is fixed to an open string 13 at a fixed rise dimension through bolts 16, 16, and both the upper and lower ends of a riser plate 14 are fittedly insrted in the recess groove 8 provided on the lower face of the tread 1 located above and the recess groove 4 provided on the upper face of the tread 1 located below.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a staircase constructed by mounting a concrete tread plate on a sasara girder and forming a unit.

[0002]

2. Description of the Related Art In a conventional stairway of this type, a concrete step plate attached to a sasara girder is integrally formed by raising a riser plate upright at the upper end of the horizontal plate portion. It is known from Japanese Patent Laid-Open No. 51-111726. Further, a concrete stepped plate attached to a sasara girder is integrally formed by hanging a riser plate at the front end of the lower surface of the horizontal plate portion, for example, as disclosed in Japanese Utility Model Laid-Open No. 3-125124.

[0003]

However, the tread plate described in each of these publications, in which the riser plate is integrally provided on the horizontal plate portion, has a complicated and large-sized die used for molding. As a result, the manufacturing process becomes complicated, and in particular, in the case of treads made of fiber-reinforced concrete having a low fluidity, the productivity is unavoidable. Further, since the manufactured tread is heavy and bulky, there is a problem that a lot of labor is required for mounting and fixing the sasara girder. Therefore, an object of the present invention is to provide a staircase formed of a tread that solves such a problem.

[0004]

In the stairs of the present invention, a concrete tread is embedded in the horizontal plate part of a grid-like reinforcing bar, and nuts are provided so as to face both end faces in the longitudinal direction of the horizontal plate part. Further, a standing plate portion is erected in the longitudinal direction of the upper surface rear end of the horizontal plate portion to form a groove on the top surface of the standing plate portion, and a concave groove is formed in the longitudinal direction of the lower surface front end of the horizontal plate portion. It is provided integrally with the tread plate and fixed to the girder girder with a predetermined kick-up dimension through bolts, etc., and is provided on the groove formed in the lower surface of the tread plate located above and the upper surface of the tread plate located below. The upper and lower ends of the riser are inserted into the concave groove.

In the staircase of the present invention, a concrete tread is embedded in the horizontal plate portion of a grid-like reinforcing bar, and
A nut is provided so as to face both end faces in the longitudinal direction of the horizontal plate portion,
Further, a standing plate portion is provided upright in the longitudinal direction of the rear end of the upper surface of the horizontal plate portion so as to be integrally formed, and the tread plate is fixed to the sasara girder with a predetermined kick-up dimension through bolts or the like.

[0006]

In the staircase of the present invention, since each stepped plate is formed mainly of the horizontal plate portion without providing the riser plate, the cross-sectional shape is close to horizontal, so that it can be easily manufactured. In addition, since it is small in size, it can be efficiently mounted and fixed to the girder. Further, in the stairs of claim 1, between the upper and lower treads, the separately formed riser plates are fitted into the concave grooves provided on the upper and lower surfaces of the treads to be attached. Further, in the stairs according to the second aspect, the standing plate portion provided upright at the rear end of the upper surface of each tread plate functions as a riser plate.

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the staircase of this embodiment, and FIG. 2 is a perspective view of the tread thereof. In the figure, reference numeral 1 is a concrete tread plate, and the tread plate 1 has a standing standing plate part 3 standing upright in the longitudinal direction of the upper back end of a horizontal plate part 2 having a predetermined length, depth and thickness. A recessed groove 4 is provided in the center of the top surface of the upright plate portion 3, and a stopper portion 5 is provided on the rear side of the top surface of the upright plate portion 3 at a position higher than the front side. Further, a thick portion 6 is provided in the longitudinal direction of the front end of the lower surface of the horizontal plate portion 2, and a concave groove 8 is provided at the rear end of the thick portion 6 via an inclined surface 7. Further, a plurality of recessed grooves are provided in the longitudinal direction of the front end of the upper surface of the horizontal plate portion 2 to form the slip stopper 9.

As shown in FIG. 3, the reinforcing bars 10 formed in a grid shape are inserted into the horizontal plate portion 2 of the step board 1. This reinforcing bar 10 has thick bars 11, 11 arranged at the front and rear in the depth direction, and nuts 12, 12 are fixed to both ends of these thick bars 11, 11 in the longitudinal direction.
2 is embedded in concrete with both end faces of the horizontal plate portion 2 facing in the longitudinal direction.

The tread plate 1 thus formed is inserted into the sasara girders 13 arranged on the left and right with a predetermined kicking dimension, and is provided on the top surface of the standing plate part 3 of the tread plate 1 located at the lower stage as shown in FIG. The recessed groove 4 and the recessed groove 8 provided on the lower surface of the tread 1 located at the upper stage are fitted and supported by the upper and lower ends of the riser plate 14 formed to have a predetermined size, and both ends of the tread 1 in the longitudinal direction are supported. Facing the Sasara girder 13 through the packing 15, and the bolts 16,
16 is screwed onto the nuts 12, 12 to complete the staircase as shown in FIG.

In the staircase thus formed, each tread plate 1 and riser plate 14 are formed separately, and the tread plate 1 has a cross-sectional shape close to horizontal and can be easily manufactured. Further, since the shape is small and the weight is light, handling such as mounting and fixing to the sasara girder 13 can be easily performed. Also, riser 1
4 can be easily supported by inserting the upper and lower ends thereof into the concave grooves 4 and 8 of the treads 1, 1 located above and below, respectively. The way of mounting the riser plate 14 is opposite. Using a riser plate 14 whose height is slightly lower than the distance between the concave grooves 4 and 8, the upper end of the riser plate is lifted to be fitted into the concave groove 8 along the inclined surface 7 on the lower surface of the upper tread plate 1, and lifted up. By inserting the lower end into the groove 4 on the upper surface of the lower tread 1 and letting it go, the rear side surface of the lower end of the riser plate 14 is supported by the stopper 5 and is mounted upright as shown in FIG. Then, in the stairs having different rise dimensions, the height dimension of the riser plate 14 can be selected and used according to the interval between the facing concave grooves 4 and 8 of the treads 1 and 1 located vertically. be able to.

(Embodiment 2) The tread plate 1a shown in FIG.
Without providing the concave grooves 4 and 8 provided in the tread 1 shown in
Everything else is formed similarly. The top surface of the standing piece 3 is flat. The tread plate 1a thus formed is inserted into the sasara girders 13 arranged on the left and right with a predetermined kicking dimension, and both longitudinal ends of each tread plate 1a are opposed to the sasara girder 13 via packings 15, and the bolts 16, 16 are provided. The nut 1
Screw to 2, 12 to complete the stairs as shown in FIG.

In the staircase constructed in this manner, the standing plate portion 3 standing upright on the upper back end of the horizontal plate portion 2 of each tread plate 1a functions as a riser plate, and is simple as shown in an enlarged view in FIG. It has a simple structure. The stairs of this embodiment are suitable for those having a small rise.

[0013]

As described above, the stairs of the present invention can be easily manufactured because each stepped plate is formed in a cross-sectional shape mainly including the horizontal plate portion close to the horizontal plate. Can be provided at low cost. In addition, the weight of the tread can be reduced, and the shape of the tread can be reduced, so that the tread can be easily attached and fixed to the girder, which has many advantages.

[Brief description of drawings]

FIG. 1 is a side view of a staircase according to a first embodiment.

2 is a perspective view of a tread used in Example 1. FIG.

FIG. 3 is a perspective view of a reinforcing bar to be inserted into a horizontal plate portion of a tread plate.

FIG. 4 is a partially enlarged side view showing a sasara girder in front of the stairs according to the first embodiment.

FIG. 5 is a side view of the stairs of the second embodiment.

6 is a perspective view of a tread used in Example 2. FIG.

FIG. 7 is a partially enlarged side view showing the Sasara girder in front of the stairs of the second embodiment.

[Explanation of symbols]

 1,1a Tread plate 21 Horizontal plate part 3 Standing plate part 4,8 Recessed groove 10 Reinforcing bar 12,12 Nut 13 Sasara girder 14 Raising plate 16,16 Bolt

Claims (2)

[Claims] 1. A concrete tread plate is embedded with grid-shaped reinforcing bars in its horizontal plate portion, nuts are provided so as to face both end faces in the longitudinal direction of the horizontal plate portion, and further, the top end of the upper surface of the horizontal plate portion is provided. The standing plate is erected in the longitudinal direction of the vertical plate to form a concave groove on the top surface of the rising plate, and the concave groove is formed integrally in the longitudinal direction of the lower surface front end of the horizontal plate to integrally form the tread plate. While fixing it to the sasara girder with a predetermined kick-up size via bolts,
A stairway configured such that both upper and lower ends of a riser plate are fitted into a groove provided on a lower surface of a tread plate located above and a groove provided on an upper surface of a tread plate located below. 2. A concrete tread plate is embedded with grid-shaped reinforcing bars in its horizontal plate part, nuts are provided so as to face both end faces in the longitudinal direction of the horizontal plate part, and the top plate rear end of the horizontal plate part is further provided. Standing plate is erected in the longitudinal direction of
A stairway configured such that the tread plate is fixed to the sasara girder with a predetermined rise size via bolts or the like.