JP3025933U - Precast concrete assembly stairs - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To make stairs of a reinforced concrete building into precast concrete so that it can be easily manufactured and provided at low cost. SOLUTION: In order to precast concrete stairs, a main body flat plate 1 and a required number of steps 2 are divided and embedded in the main body flat plate 1 and embedded in the main body flat plate 1.
And the step fitting metal fitting 5 embedded in the step 2 are engaged and assembled. By separately manufacturing the main body flat plate 1 and the step 2 in this way, the mold is simplified,
Many kinds of stairs with different stair heights, step heights and widths can be easily and inexpensively manufactured.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an assembling staircase comprising one main body flat plate made of concrete and a required number of steps.

[0002]

[Prior art]

 For stairs of reinforced concrete buildings, it is common to lay concrete and form concrete at the site, but the recent shortage of workers, especially the lack of formwork carpenters for skilled workers, is the current situation. Therefore, there is a tendency for the stairs to be precast (produced at an existing factory and assembled locally). The existing precast concrete stairs are manufactured by transporting them to the site by making the main plate and the steps integrally.

[0003]

[Problems to be solved by the device]

 For stairs of buildings, the length of stairs, the height of steps, etc. can be changed in various ways depending on the design and structure of the structure. Or, in each case, a precast staircase will be produced by producing a formwork corresponding to the shape. The above-mentioned changeable formwork is extremely precise and expensive, and it is possible to complicate the formwork production for each case, or to produce several types of formwork in one structure. In some cases, the unit price of the formwork becomes expensive, and the unit price of the product also rises, which is an obstacle to precasting.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention intends to assemble a step made of precast concrete by separately manufacturing a main plate and a step. Thus, by providing several types of molds that are simple and inexpensive, it is possible to manufacture stairs of various structures and obtain a stair that is easy to assemble at low cost.

[0005]

[Embodiment of device]

 The present invention consists of one main body flat plate made of concrete and a required number of steps. The step attachment surface of the main body flat plate described above has two steps in the width direction for attaching the steps. An embedding metal fitting for a main body plate having an engaging hole is embedded, and two embedding metal fittings for a step having an engaging protrusion are embedded at two positions in the longitudinal direction of the mounting surface of one of the steps to the main body flat plate. It is a precast concrete assembling staircase of a structure in which a step is assembled to a main body flat plate by engaging an engaging projection with the engaging hole.

[0006]

【Example】

 An embodiment will be described with reference to the drawings. FIG. 1 is a vertical sectional view showing an example of a precast concrete assembly staircase of the present invention, FIG. 2 is a plan view thereof, 1 is a flat plate of the main body, and 2 is a step. Separately manufactured as precast concrete, the flat plate 1 and the step 2 are engaged and fixed at two engaging points P for each step.

FIG. 3 is a partially enlarged view of FIG. 1, showing details of the engaging and fixing state, 3 is an embedded metal fitting for a main body flat plate in detail, and 5 is an embedded metal fitting for a step. It is shown in FIG.

The main body flat plate embedding fitting 3 has a bar for stabilizing the embedding on a box-shaped back surface having a space inside, as in the plane shown in A of FIG. 4, the front shown in B, and the side shown in C. It is fixed, and an engaging hole 4 having an enlarged portion 4a at one end of the long hole is provided on the upper surface thereof. This metal fitting for main body flat plate 3 is made to match the upper end surface with the upper surface for each step at two engaging positions P in the width direction shown in FIG. 2 on the upper surface side to which the step 2 of the main body flat plate 1 is attached. The two female screw holes 3a on the upper end surface are used for attaching the main body flat plate embedded metal fitting 3 to a form (not shown).

The step embedding member 4 has a lower end of a bolt that penetrates through the centers of two plates arranged in parallel vertically, such as the front surface shown in D of FIG. 5, the side surface shown in E, and the bottom surface shown in F. An engaging projection 6 is formed by projecting to the lower side and welding a hexagon nut to the tip thereof to form the head. The step mounting recess 4 is embedded at the engagement position P on the back surface of the step 2 so as to protrude from the engaging projection path 6 in correspondence with the main body flat plate mounting recess 3. The female screw hole 5a is used for attaching the step embedding member 4 to a form (not shown).

To engage the engagement protrusion 6 with the engagement hole 4, the engagement protrusion 6 is inserted into the enlarged portion 4 a of the engagement hole 4 and the step 2 is pulled downward. The engaging projection 4 is fitted in the narrow portion of the engaging hole 4, and the head of the engaging projection 6 is hooked on the main body flat plate fitting 3 to be fixed and prevented from coming off. In the figure, 7 indicates a reinforcing bar.

What is particularly necessary for implementing the present invention is to improve the accuracy of the embedded positions of the main body flat plate embedded metal fitting 3 and the step embedded metal fitting 5.

[0012]

[Effect of device]

 The present invention is implemented in the form as described above, and has the following effects.

Since the mold for making the precast concrete stairs can be simplified and manufactured at low cost, the product cost can be reduced.

By providing several types of molds having a simple structure, various kinds of stairs can be obtained, so that the range of use can be expanded.

Assembly of the stairs can be carried out extremely simply by engaging the main body flat plate and the embedded metal fittings embedded in the steps, respectively.

It is possible to promote the spread of precast concrete stairs, cover the shortage of formwork carpenters that require special skills at the construction site, and promote construction.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a precast concrete assembly staircase.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially enlarged view of FIG. 1 showing details of an engagement state between a main body flat plate and a step.

FIG. 4 is a detailed view of an embedded metal fitting for a main body flat plate, where A is a plane surface and B is a surface area.
Indicates the front and C indicates the side.

FIG. 5 is a detailed view of an embedded metal fitting for a step, where D is a front surface, E is a side surface, and F is a flat surface.

[Explanation of symbols]

 1 main body flat plate 2 step 3 body flat plate embedding metal fitting 4 engagement hole 5 step embedding metal fitting 6 engaging protrusion

Claims (1)

[Scope of utility model registration request] 1. A main body flat plate (1) made of concrete.
And a required number of steps (2), and an engaging hole (4) for attaching the steps (2) at two positions in the width direction of each step on the step mounting surface of the main body flat plate (1). ) Is embedded in the main body flat plate embedding metal fitting (3), and one step (2) is provided with engaging projections (6) at two positions in the longitudinal direction of the attachment surface to the main body flat plate (1). Embed the step fittings (5),
A precast concrete assembling staircase characterized in that an engaging projection (6) is engaged with an engaging hole (4) to attach a step (2) to a main body flat plate (1).