JPH11303349A - Precast concrete stairs corresponding to stairs of different floor height, and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide precast concrete stairs and its manufacturing method for manufacturing RC stairs of different floor height of a building. SOLUTION: A rise step part, a stair beam part 1 without a tread part, and a landing part 2 are manufactured as a series of precast concrete member A into dimensional specifications appropriate to the floor height of a building. Weld backing hardware is driven in the inclined direction of the upper face of the stair beam part 1, and step parts forming the rise step part and a tread part are also manufactured as a precast concrete member A of triangle pole shape from the side face view. Welding hardware is driven into the lower bottom face of the step parts so as to come in contact with the hardware of the stair beam part 1. The step parts are arranged on the stair beam part 1 at the spacing allotted according to the floor height of the building, and both hardware are welded to each other and integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of manufacturing stairs of a building as a precast concrete member (hereinafter sometimes abbreviated as a Pca member).

[0002]

2. Description of the Related Art Conventionally, reinforced concrete structures (hereinafter referred to as
It may be abbreviated as RC construction. The method of manufacturing or installing the stairs is based on, for example, the type of the building, as described in FIGS. 7 and 8 of JP-A-9-123142.
In order to properly design and construct the number of steps and the size of the rise according to the application and the floor height, construction is done on site. In the construction method of RC stairs described in Japanese Patent Application Laid-Open No. 5-295868, a stair beam portion and a landing are constructed by cast-in-place concrete in a cantilever state integrally with a building frame (wall surface). Fixing a slab girder to the free edge of the stair beam,
Attach the stepboard made as a precast concrete member, and install a thin plate as a substitute for the riser plate between the upper and lower steps. In the method for manufacturing an RC staircase described in Japanese Patent No. 2550885 (issued on November 6, 1996), a mold forming a tread portion and a riser is arranged so as to be movable in the front-rear direction according to a desired number of steps. It is fixed to the frame, and concrete is cast on it, and the beam up to the stairs is integrally manufactured. The precast concrete stair forming apparatus described in Japanese Patent Application Laid-Open No. 9-123142 includes a first and a second landing support, a stair beam support having a variable length by an expansion joint, and a staircase for forming a side surface of the stair. It is a device that is made of pre-cast concrete and is integrally formed of a formwork and the entire stairs including a landing portion and a staircase portion, and also describes a forming method.

[0003]

[Issues to be solved by the present invention] I) Since the above-mentioned method is performed on site, the production efficiency of stair formwork decreases, the arrangement of reinforcing bars is disturbed, plastering occurs,
Problems have been pointed out, such as a delay in the early use of work safety passages in building construction work. II) The above-mentioned stairway construction method also has the same problem as the above because the stair beam is constructed in a cantilever state using cast-in-place concrete. Not only that, the fixing of the girder and the fixing of the steps can only be carried out after curing the cast-in-place stair beams until the strength has developed, and such work requires a lot of man-hours. Since it does, there is not much benefit in shortening the construction period, saving labor and labor. III) The above-mentioned method of manufacturing stairs also aims to be able to freely set the number of steps and the rise height according to different floor heights, but the degree of freedom is limited only to the configuration and operation of the formwork device. . IV) The above stair forming apparatus can also change the height and length of the stairs according to the floor height of the building, but the degree of freedom is limited only to the configuration and operation of the formwork apparatus.

Accordingly, an object of the present invention is to provide a precast concrete staircase capable of inexpensively manufacturing RC stairs having different floor heights of a building by rotating the same manufacturing bed many times, and a method of manufacturing the same. is there. The next object of the present invention can be implemented in a high-quality place in a factory or a site where the equipment at the site is well-equipped. An object of the present invention is to provide a precast concrete staircase that can be used as a safety passage at an early stage and a method of manufacturing the same.

[0005]

As a means for solving the above-mentioned problems, a precast concrete staircase for stairs having different floor heights according to the present invention is a stair beam having no riser step portion and no tread portion. The part and landing are made as a series of precast concrete members with the appropriate dimensions for the floor height of the building, metal fittings for the welding base are driven into the upper surface of the stair beam, and the riser step and step The step portion forming the surface portion is also manufactured as a precast concrete member having a triangular prism shape as viewed from the side, and a metal fitting for welding is driven into the lower bottom portion of the step portion so as to be in contact with the metal piece of the stair beam. The step is arranged on the stair beam at a pitch allocated according to the floor height of the building, and both hardwares are welded together to be integrated.

According to a second aspect of the present invention, in the precast concrete staircase according to the first aspect, the gap between the stair beam portion and the step portion, which are integrated by welding both metal parts, is provided. It is characterized by being filled with injected mortar. According to a third aspect of the present invention, there is provided a method of manufacturing a precast concrete stair corresponding to a stair having a different floor height, wherein a stair beam portion having no riser step, a tread portion, and a landing portion are formed as a series of precast concrete members. The process of manufacturing by fitting metal under the welding base in the inclined direction of the upper surface of the stair beam part with the appropriate dimensional specifications, and the precast concrete in the form of a triangular prism as viewed from the side of the step forming the riser step and the tread part A step of driving a metal fitting for welding in such a manner as to be in contact with the metal fittings of the stair beam on the lower bottom surface of the step, and forming the step on the upper surface of the stair beam, And disposing them at a pitch allocated according to the above, and welding and unifying both metal parts.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a precast concrete staircase corresponding to a staircase having a different floor height according to the third aspect, wherein both metal parts are welded together to form a stair beam part and a step part. It is characterized in that the gap is filled with mortar injected.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a step of a method of manufacturing a precast concrete stair corresponding to a stair having a different floor height according to the third and fourth aspects of the present invention. A precast concrete member A in which a stair beam portion 1 having no tread portion and upper and lower landing portions 2 and 3 are formed in series is shown. FIG. 2 shows a stage in which the stepped portion B forming the riser stepped portion 4 and the tread portion 5 is formed as a precast concrete member having a triangular prism shape when viewed from the side.

In short, according to the present invention, the precast concrete member A shown in FIG. 1 is integrally provided with the necessary number of steps B shown in FIG. 2 as shown in FIGS. It is a method of manufacturing. Precast concrete member A shown in Fig. 1 for stairs with different floor heights
Is manufactured on the premise that it is installed and constructed in a building as shown in FIG. Therefore, in the Pca factory, the same production bed (form) can be produced by rotating (using) many times, and the cost can be reduced. In the direction of inclination of the upper surface of the staircase beam portion 1, two rows of flat bars 6 having a width of about 50 mm as hardware serving as a welding base for integrally attaching the stepped portion B (however, the number of rows and the metal shape are the same as those of the first embodiment). It is not limited.)

On the other hand, on the lower bottom surface (slope) of the step B, two rows of flat bars 6, 6 on the upper surface of the stair beam 1 are provided.
In this arrangement, two connecting plates 7 as metal parts to be welded with the connecting plate 7 are driven upright. 3 and 4 show details of the connection between the connecting plate 7 and the stepped reinforcing bar 8.
Is shown in At both ends of the connecting plate 7, notches 9 and 10 for exposing the connecting plate 7 are provided as working spaces necessary for welding a contact portion of the stair beam 1 with the flat bar 6. It is formed in a rectangular groove shape of about 50 mm.

Therefore, the steps B are arranged on the stair beam 1 at a pitch assigned according to the floor height of the building,
The two flat bars 6 and the connection plate 7 are welded and integrated. The notches 9 and 10 form a space convenient for inserting the welding rod. The gap between the stair beam 1 and the step B thus integrated (including the notches 9 and 10).
When the mortar is injected and filled firmly, the Pca steps are completed (the invention according to claims 1 and 2).

The production of the precast concrete member A, the production of the stepped portion B, and the attachment of the stepped portion B to the precast concrete member A are performed in a Pca member production factory equipped with facilities. Alternatively, in consideration of transportation difficulties, it is performed at a manufacturing site prepared at the site of the site. In any case, the completed P as shown in FIGS.
The upper and lower landings 2, which correspond to both ends of the ca stairs,
3 is suspended by a threaded rebar 11 (or a wire, a steel bar, or the like), and the installation work is performed as shown in FIG.
Therefore, the precast concrete member A of FIG. 1 is provided with a plurality of holes 12 through which the reinforcing bar 11 passes in the upper and lower landing portions 2 and 3 in advance. Also, at both ends of the step B,
A hole 14 for erection of the vertical support 13a of the handrail 13 shown in FIG. 7 is also provided in advance, and the handrail 13 is attached on the ground before the precast concrete member A is suspended.

The installation of the Pca stairs is performed as an operation of sequentially suspending the stairs from the top floor or the middle floor to the lower floor because the Pca stairs are suspended by the reinforcing bars 11 as shown in FIG. At this time, in order to facilitate the integrated construction of the upper and lower landing portions 2 and 3 and the building frame (wall body) 16, a part of the reinforcing steel of the precast concrete member from the tip of the upper and lower landing portions 2 and 3. 15 is projected, and the reinforcing bar 1
5 is joined to a wall bar to perform a firm installation work. Therefore, the Pca stairs can be used as a work safety passage for a building immediately after installation.

[0014]

According to the precast concrete stairs for stairs having different floor heights and the method of manufacturing the same according to the present invention, Pca stairs having different floor heights of a building can be inexpensively manufactured by rotating the same manufacturing bed many times. It is possible to produce. In addition, it can be implemented with high quality in a factory or on site where the equipment on the site is well-equipped, and it can save labor and temporary plastering work on site formwork and temporary work, and can be used early as a safety passage for construction work. A possible precast concrete staircase and a method of manufacturing the same can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a step beam portion and the like manufactured by a manufacturing method of the present invention.

FIG. 2 is a perspective view of a step manufactured by the manufacturing method of the present invention.

FIG. 3 is a vertical sectional view of a step portion.

FIG. 4 is a front view of a stepped portion on a rise surface side.

FIG. 5 is a front view in which a precast concrete member and a step portion are integrated.

FIG. 6 is a plan view in which a precast concrete member and a step portion are integrated.

FIG. 7 is an elevational view of the mounting state of the Pca stairs.

[Explanation of symbols]

 4 Raised step part 5 Tread part 1 Stair beam part 2 Landing part 3 Landing part A Precast concrete member 5 Flat bar B Step part 7 Connecting plate

Claims (4)

[Claims] 1. A stair beam part and a landing part without a riser step, a tread part, and a landing part are manufactured as a series of precast concrete members with dimensions appropriate for the floor height of a building, and are welded in the direction of inclination of the upper surface of the stair beam part. The base metal is driven in. The step that forms the riser step and the tread is also made as a triangular prism-shaped precast concrete member when viewed from the side.
The metal fittings for welding are driven into the lower bottom part of the step in contact with the metal of the stair beam, and the step is allocated on the stair beam according to the floor height of the building. Precast concrete stairs for stairs with different floor heights, which are arranged at a pitch and integrated by welding both metal parts together. 2. The step height difference according to claim 1, wherein a gap between the stair beam portion and the step portion integrated by welding the two metal pieces together is filled with mortar injected. Precast concrete stairs for stairs. 3. A series of precast concrete members made of a stair beam portion and a landing portion having no riser step portion, no tread portion, and welded in a direction appropriate for the floor height of the building and in an inclined direction of the upper surface of the stair beam portion. A step of driving a base metal part into a production step, and a step part forming a riser step part and a tread part part as a precast concrete member having a triangular prism shape when viewed from the side, and a metal part of the stair beam part on the lower bottom part of the step part. A step of manufacturing by welding a metal fitting for welding in an arrangement in contact with the stairs, and arranging the steps on the upper surface of the stair beam at a pitch allocated according to the floor height of the building, and welding both metal parts together to form A method of manufacturing a precast concrete staircase for stairs having different floor heights. 4. The precast for stairs having different floor heights according to claim 3, wherein a gap between the stepped beam portion and the stepped portion is welded and integrated with each other by welding, and is filled with mortar. How to make concrete stairs.