JPH05106319A - Construction method for staircase using half-precast slab - Google Patents

Abstract

PURPOSE:To enhance work efficiency for the construction of a reinforced concrete staircase and rationalize a construction work by using a half-precast slab as the structural member of the staircase. CONSTITUTION:A half-precast slab 1 is laid between the upper and lower ends of a staircase, and concrete is applied after laying an upper reinforcement 3, thereby forming a sloped slab. Then, an L-type precast slab is provided. Alternatively, the slab 1 is laid between the upper and lower ends of the staircase, the upper reinforcement 3 is laid, and then the predetermined form of a porous plate-like reinforcement is provided. Thereafter, concrete is applied. According to this construction, a staircase with integrated half-precast slab and other components can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently constructing a reinforced concrete staircase by using a half PC board.

[0002]

2. Description of the Related Art Reinforced concrete staircases having various structures and materials have been known so far, which have a structure laid between the upper and lower floors of a building, and especially for large structures, Typical examples include an oblique beam type and an oblique floor slab type (that is, an oblique slab type). And the construction method of the latter is usually to arrange the main bar, the bottom bar, the insama bar, the top bar, etc. between the upper and lower floors, assemble the formwork, and place concrete, but in this construction method, It was very time consuming because of the large number of work steps in.

Moreover, since these works are required for each stair, the number of materials is large when a plurality of stairs having different designs are simultaneously constructed, and the work procedure including material management is considerably complicated. On the other hand, half-PC (that is, precast concrete board in which reinforcing bars are arranged so that a part thereof projects on the surface) has already been used as a building material, but it is mainly used for floor slab materials, and in some cases It has also been considered as a wall material.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a new method for constructing a reinforced concrete staircase which has a significantly higher work efficiency than the conventional method.

[0005]

Means for solving the above problems of the present invention are as follows. The half PC board is laid between the upper and lower floors of the stairs, the upper end bar is arranged at a predetermined position above the staircase, and then the concrete is placed to form the half P board.
Forming an oblique slab integrated with the C plate, and then sequentially installing L-shaped PCs on the oblique slab in a stepwise manner,
Or 2. Cross the half PC board between the upper and lower floors of the stairs,
After arranging the upper end bar at a predetermined position above it, a porous plate-like reinforcing material bent into a step corresponding to the stair step is arranged at a predetermined position above the upper end bar, and then concrete is poured. Step and diagonal slab at the same time and the half P
It is characterized in that it is formed integrally with the C plate.

The half PC board used in the present invention is a precast concrete board in which a joining reinforcing bar is arranged so that a part thereof projects from the surface in order to join and integrate it with an oblique slab. The basic structure is essentially the same as that used as the floor slab material in the past, and the necessary reinforcing bars have already been applied in addition to the reinforcing bars for joining. In addition to the aggregate, the half-PC board has metal,
Reinforcing additives such as synthetic fibers, fibers such as ceramics and glass, and other auxiliary additives may be blended. Further, the L-shaped PC used in the present invention is a precast concrete molded product having an L-shaped shape and size corresponding to the step portion of the stairs. The porous plate-shaped reinforcing material of the present invention means a porous plate-shaped material such as expanded metal, metal lath, wire lath, etc., which has a reinforcing effect on a concrete material.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. First, FIG. 1 shows a state in which a half PC board 1 is bridged between the upper and lower floors of a staircase (note that 3 is an upper end streak). .. The half-PC board 1 can be formed by the same method as that of the conventional half-PC material for floor slabs, for example, by pouring and solidifying concrete into a frame in which the reinforcing bars 2 for joining are arranged at predetermined positions. The joining reinforcing bar 2 basically has a shape such that it extends over substantially the entire length of the half PC board 1 and can be firmly integrated with the diagonal slab of the stairs, for example, in a lattice shape or in the lengthwise direction of the stairs as shown in FIG. Along the zigzag pattern or the zigzag pattern, a part of the zigzag pattern or the zigzag pattern is arranged to project from the upper surface of the half PC board 1. However, the specific shape and disposition state of the joining reinforcing bar 2 can be appropriately selected in consideration of the required strength of the half PC board 1 (and therefore the required strength of the entire stairs), etc. It is also possible to further arrange the auxiliary reinforcing bars. Further, the thickness of the half PC board 1 can be appropriately selected in consideration of the load of the entire stairs by being related to the shape and arrangement state of the reinforcing material such as the reinforcing bar 2 for joining.
In the present invention, since the half PC plate has sufficient strength, a considerable portion of the reinforcing bar such as the main reinforcing bar and the bottom reinforcing bar is unnecessary, and the construction work can be simplified.

Next, FIG. 2 illustrates the aspect of the invention of claim 1, and FIG. 3 illustrates the aspect of the invention of claim 2, respectively. First, referring to FIG. 2, the half PC board 1 is first laid between the upper and lower floors of the stairs to bring the state of FIG.
Then, after the upper end reinforcement 3 is arranged at a predetermined position above the half PC board 1, concrete is placed to form the diagonal slab 4. After the diagonal slab 4 is fully solidified,
The stairs are constructed by sequentially installing the L-shaped PC 5 from the bottom to form a step. In the construction method according to the second aspect, the material and color tone of the L-type PC can be easily selected and changed, so that there is a large degree of freedom in design, and the stairs can be constructed extremely rationally in combination with the simplification of the work.

Next, referring to FIG. 3, first, the half PC board 1 is bridged between the upper and lower floors of the stairs to obtain the state of FIG. Then, the upper end streak 3 is arranged at a predetermined position above the half PC board 1, and the porous plate-like reinforcing member 6 bent at a predetermined step above the upper end streak 3 is formed into a step corresponding to the stair step. After that, concrete is poured to form stairs and diagonal slabs simultaneously and integrally with the half PC board 1 to construct a staircase. According to the method of claim 3, the half PC
It is possible to easily construct a strong staircase in which the plate, the slanted slab portion and the step portion are integrated.

As described above, the half P described in claims 1 and 2
The construction method of reinforced concrete stairs using C plates was explained, but during those processes, half PC plates were bridged, upper end bars were arranged, and L-shaped PCs were installed on diagonal slabs.
The work of arranging the porous plate-like reinforcing material and the work of placing concrete can be appropriately performed in accordance with the procedure of conventional concrete construction.

[0011]

The present invention described in claim 1 and claim 2 has a novel idea in that the half PC board is applied particularly to the construction of a reinforced concrete staircase,
As a result, the following remarkable effects are exhibited, and the construction work efficiency of the reinforced concrete stairs can be remarkably increased, and the work management can be rationalized.

(1) Half PC for the main part of the staircase body
By replacing with a plate, it is possible to reduce the number of reinforcing bars to be laid on site and the amount of concrete to be placed, so that site work can be significantly simplified and work can be promoted.

(2) Both the half PC board and the L-shaped PC are suitable for mass production, and therefore, it is easy to deal with the construction of many stairs.

(3) Since the types and points of the reinforcing bars used for stair construction are reduced, the work including material management can be rationalized.

[Brief description of drawings]

FIG. 1 shows a state in which a half-PC board is hung across the top and bottom of stairs.

FIG. 2 shows how an L-shaped PC is installed on an oblique slab.

FIG. 3 shows a state in which a half PC plate, an upper end streak, and a porous plate-shaped reinforcing material are arranged.

[Explanation of symbols]

 1 Half PC Plate 2 Reinforcing Bar 3 Upper End Bar 4 Oblique Slab 5 L-type PC 6 Porous Plate Reinforcement Material

Claims (2)

[Claims] 1. A diagonal slab integrated with the half-PC board by straddling the half-PC board between the upper and lower floors of stairs, arranging an upper end streak at a predetermined position above the staircase, and then placing concrete. And a L-shaped PC is sequentially installed on the diagonal slab in a stepwise manner. 2. A half-PC board is laid between the upper and lower floors of a staircase, upper end streaks are arranged at a predetermined position above the staircase, and then a porous plate-shaped reinforcing material is formed by bending into a step corresponding to the stair step. A method for constructing stairs, characterized by arranging at a predetermined position above the upper end streak, and then pouring concrete to form a step and an oblique slab simultaneously and integrally with the half PC board.