JP2719635B2 - Stair construction method using precast concrete block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stair construction method using a precast concrete block in which a reinforced concrete staircase is semi-prefabricated to simplify construction.

[Problems to be solved by conventional technology and invention]

Conventionally, it has become commonplace that all stairs of a reinforced concrete building be constructed on site integrally with the skeleton work.However, since the shape and structure are complicated, complicated formwork and
A large number of top lids and temporary materials are required to prevent concrete from flowing out due to the stairs, and the production, loading, assembly, dismantling,
It took a lot of time and effort to carry it out, which had a considerable effect on the construction period and construction costs.

In view of the above problems, the present invention has been made with the object of rationalizing the construction of the above-mentioned conventional stairs, and is intended to improve construction efficiency, shorten the construction period, and reduce construction costs. It is intended to provide a way.

[Means for solving the problem]

In order to solve the above object, the present invention provides a precast concrete stair unit in which a front and rear leg plate and a bottom plate are formed in advance under a block having a substantially triangular cross section having a tread surface and a rise surface, The stair units are arranged in vertical and horizontal stairs on temporary support materials between the landings of the stairs,
The method is characterized by a precast concrete block in which vertical and horizontal reinforcing bars are incorporated in the gaps between the leg plates of the vertically and horizontally arranged stair units, and then concrete is poured into the voids of the stair units incorporating the vertical and horizontal reinforcing bars.

[Action]

Therefore, according to the present invention, since a complicated formwork and a top lid are not required at all, the time required for manufacturing, carrying in, assembling, dismantling, and carrying out the formwork is eliminated, and the stairs are made semi-prefab with precast concrete. Therefore, cost reduction and quality improvement by mass production, and simplification of construction work are realized, shortening of construction period and reduction of construction cost are achieved.

〔Example〕

 Hereinafter, the present invention will be described in detail based on the illustrated embodiment.

FIG. 1 is a side view of a staircase constructed by the method of the present invention at the time of construction, FIG. 2 is a plan view of the staircase at the time of construction, and FIG. 3 is a perspective view of a stair unit made of precast concrete.

Precast concrete stair unit 1 is the third
As shown in the figure, a pair of leg plates 1c, 1c arranged in parallel to the left and right, and a bottom plate connecting the lower ends of both leg plates 1c, 1c, under a block having a substantially triangular cross section formed with a tread surface 1a and a rise surface 1b. 1d provides a gap 2 in the vertical direction of the stairs,
Has a height corresponding to the thickness of the slab of the stairs, and the front edge 1e of the leg plate 1c is formed at an acute angle to improve the flow of concrete poured from above. The edges may be provided both at the front and the rear.

The staircase unit 1 is sized and weighed so that it can be carried by one or two workers so that it can be easily transported and constructed.

In the construction of the stairs by the stair unit 1, first, a vertical flutter angle 4 is arranged between the vertical landings 3 and 3 ′ at intervals of the vertical joints of the stair unit 1, and this is supported by the struts 5 and the horizontal flutter angle 6.

Next, stair unit 1 is lined up horizontally from the bottom of the stairs,
This will be carried out sequentially toward the upper part of the stairs. At this time, a horizontal reinforcing bar 7 is assembled before and after the leg plate 1c for each step of the stair units 1 arranged in a row, and both ends of the horizontal reinforcing bar 7 are extended to the wall 8 and the handrail 9 of the skeleton as fixing portions.

When the stacking of the stair units 1 of all steps is completed, a vertical reinforcing bar is inserted into the gap between the leg plates 1c of the stair units 1 that are cascaded from the top of the stairs.
10 and the upper and lower ends of the vertical reinforcing bar 10 are up and down landings 3,3 '
To the vertical reinforcing bar 11. The vertical rebar 10 may not penetrate the whole stairs at once, but may be penetrated while being spliced every several steps.

When the above work is completed, the upper and lower landings 3, 3 ', the wall 8,
At the same time as the handrail 9 is poured into the concrete, the concrete is poured from the skillfully into the space between the leg plates 1c of the stacked staircase units 1. The poured concrete spreads over the entire gap without stagnation because the front edge 1e of the leg plate 1c forms an acute angle.

After the concrete is hardened, if the supporting materials such as the vertical flutter angle 4, the strut 5 and the horizontal flutter angle 6 are removed, the stairs 1a can be used immediately because the tread 1a is already made of precast concrete.

As shown in FIG. 4, the staircase unit 1 may have a single leg plate 1c, which facilitates die-cutting during precasting.

The stairs constructed by the method of the present invention are one-way slabs,
It can be applied to any cantilevered slab, and after the upper and lower landings are constructed, the stairs can be constructed later.

〔The invention's effect〕

As described above, the present invention prepares in advance a stair unit made of precast concrete in which a leg plate and a bottom plate in the front-rear direction are formed below a block having a substantially triangular cross section in which a tread surface and a rise surface are formed. The units are arranged vertically and horizontally on the support material temporarily installed between the up and down landings of the stairs, and vertical and horizontal reinforcing bars are incorporated in the gaps between the legs of the stair units arranged vertically and horizontally. Since it is constructed by pouring concrete,
Eliminates the need for complicated formwork and top lids at all, and eliminates the time required to manufacture, carry in, assemble, disassemble, and carry out formwork, and semi-prefabricated stairs using precast concrete, resulting in cost reductions due to mass production. And quality improvement and simplification of construction work, shortening the construction period,
Reduction of construction cost is achieved.

[Brief description of the drawings]

Drawings show an embodiment of the present invention, FIG. 1 is a side view at the time of construction of stairs constructed by the method of the present invention, FIG. 2 is a plan view of the stairs at the time of construction, FIG. 3 and FIG. It is a perspective view of each different Example of a staircase unit. 1 ... Stair unit made of precast concrete, 1a
... tread surface, 1b ... rise surface, 1c ... leg plate, 1d ... bottom plate, 3, 3 '... landing, 4, 5, 6 ... support material, 7 ... horizontal rebar, 10 ... vertical rebar .

Claims (2)

(57) [Claims] 1. A precast concrete stair unit having a front and rear leg plate and a bottom plate is prepared in advance below a block having a substantially triangular cross section on which a tread surface and a rise surface are formed. Vertically and horizontally stairs are arranged on the temporary support material between the vertical landing, and vertical and horizontal reinforcing bars are installed in the gaps between the leg plates of the vertical and horizontal stair units. A stair construction method using a precast concrete block characterized by construction. 2. The method according to claim 1, wherein a front edge and / or a rear edge of a leg plate of the stair unit is formed at an acute angle.