JPH0757978B2 - Construction method of stairs using half PC board - Google Patents

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 spanning the upper and lower floors of a structure. 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 troublesome 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-PCs (that is, precast concrete boards with reinforcing bars arranged so that part of them protrudes on the surface) have already been used as building materials, but mainly for floor slab materials, and in some cases walls. It has also been considered as a 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 Problems] The means for solving the above-mentioned problems of the present invention is to hang a half-PC board between the upper and lower floors of a staircase and arrange an upper end streak at a predetermined position above the staircase. A porous plate-shaped reinforcing member that is bent in a step shape corresponding to the section is placed at a predetermined position above the upper end streak, and then concrete is placed to form the step section and the diagonal slab simultaneously and integrally with the half PC board. It is characterized by being formed into.

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 added. The porous plate-shaped reinforcing material of the present invention means a porous plate-shaped material having a reinforcing effect on concrete materials such as expanded metal, metal lath, and wire lath.

[0007]

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 a method similar to that of a conventional floor slab half PC material, for example, by injecting and solidifying concrete into a frame in which the joining reinforcing bars 2 are arranged at predetermined positions. The joining reinforcing bar 2 basically has a shape that can be firmly integrated with the diagonal slab of the stairs over substantially the entire length of the half PC plate 1, for example, in a lattice shape or along the length direction of the stairs as shown in FIG. It is arranged in a zigzag shape or in a zigzag shape so that a part thereof protrudes 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 (thus, the required strength of the entire stairs) and the like. 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 of the reinforcing material such as the joining reinforcing bar 2 and the arrangement state.
In the present invention, since the half PC plate has sufficient strength, a considerable part of the reinforcing bar such as the main reinforcing bar and the bottom reinforcing bar is not required, and the construction work can be simplified.

Referring next to FIG. 2, first, the half PC board 1 is hung between the upper and lower floors of the stairs to bring the state of FIG. Then, the upper end reinforcement 3 is arranged at a predetermined position above the half PC board 1, and the porous plate-like reinforcing member 4 bent at a predetermined position above the upper end reinforcement 3 is formed into a step corresponding to the stair step. Then, concrete is poured to form the step and the diagonal slab at the same time and integrally with the half PC board 1 to construct the stairs. In this way, a strong staircase in which the half PC plate, the slanted slab portion and the step portion are integrated can be easily constructed.

The method for constructing a reinforced concrete staircase using half PC boards has been described above. During these steps, the half PC boards are bridged, the upper end bars are arranged, and the porous plate-shaped reinforcing material is arranged. Each work of concrete pouring can be appropriately performed according to the procedure of the conventional concrete construction.

[0010]

INDUSTRIAL APPLICABILITY The present invention has a novel idea conceived in that half PC boards are applied particularly to the construction of reinforced concrete stairs, whereby the following remarkable effects are exhibited. The construction work efficiency of stairs can be remarkably increased and the work management can be rationalized.

(1) Half the main part of the staircase body
By replacing with C plate, the number of rebars to be laid out at the site and the amount of concrete to be placed can be reduced, so that the site work can be remarkably simplified and the work can be promoted.

(2) 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 bridged between the top and bottom of a staircase.

FIG. 2 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 ... Top bar, 4 ... Porous plate-shaped reinforcing material.

Claims (1)

[Claims] 1. A half PC board is hung between the upper and lower floors of the stairs.
After arranging the upper end bar at a predetermined position above it, stair steps
Porous plate-shaped reinforcing material that is bent in steps corresponding to the part
Is placed at a predetermined position above the upper end streak, and then the concrete
To set the step and the slanted slab at the same time.
A method of constructing stairs, characterized by being formed integrally with a PC board .