JP2586921B2 - Concrete stairs and construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a concrete staircase and a method for constructing the staircase.

2. Description of the Related Art Conventionally, as a method for constructing a concrete stair, a method based on a total site construction and a method based on a total precast concrete construction are known.

In the case of construction by total site construction, plywood is assembled three-dimensionally on site to form a formwork, rebar is assembled in this formwork, concrete is poured into the formwork, and stairs are formed I do.

Also, when constructing by pre-cast concrete construction, assemble a formwork for stair forming at the factory, and then assemble the rebar in this formwork, then cast concrete in the formwork to form a staircase. A precast concrete molded body is manufactured, and the precast concrete molded body is attached on site.

"Problems to be solved by the invention" The problems to be solved by the present invention are the following two points.

In the method based on all-site construction, since the shape is complicated, it is necessary to assemble the form three-dimensionally, and it takes time and effort.

In the method by total precast concrete construction,
It takes a long time to manufacture a mold for step molding, and the assembly of reinforcing bars embedded in concrete becomes complicated.

[Means for Solving the Problems] In the concrete staircase of the present invention, a flat slab made of precast concrete is attached in an inclined state, and each step member made of precast concrete is fixed to an inclined upper surface of the slab. A large hole is formed, and each step member is joined to the upper surface of the slab at its inclined lower surface, and a large crest is embedded in the lower surface of each step member. Each step member is fixed to a predetermined position on the slab by being inserted into the hole.

The method of constructing a concrete staircase of the present invention includes:
A step member whose surface opposite to the tread surface is inclined is made of precast concrete with a stirrup buried in the inclined surface, and a flat slab for fixing each step member is thickened on one surface. After forming a hole and manufacturing it by precast concrete, then, after inserting the stirrups into the studs and fixing the step members at predetermined positions on the slab, the slab is inclined. Attach it.

According to another construction method of a concrete staircase of the present invention, a step member whose surface on the side opposite to the tread surface is sloped is manufactured by precast concrete by embedding a crooked streak on the sloped surface. At the same time, a flat plate slab for fixing these step members is made with precast concrete with a large hole formed on one side, and then the above slab is attached with the large hole up and inclined. After that, the stirrups are inserted into the stirrup holes to fix the step members at predetermined positions on the slab.

[Operation] In the concrete staircase of the present invention, since the step member and the slab to which the step member is attached are made of independent precast concrete, the production of the formwork is facilitated, and the step member and the slab are removed. It can be easily manufactured on site. Also,
Since the step member and the slab are joined by the pits and holes, the fixing of the step member to the slab becomes easy, and the construction of the concrete stairs becomes easy.

In the method for constructing a concrete staircase according to the present invention, the slab is inserted by inserting the stirrups into the stitches and fixing the step members at predetermined positions on the slab, and then mounting the slab at an angle. It is possible to fix the step member in a state where is horizontal, thereby improving the accuracy of the tread width and the rise surface height.

In another concrete stairs construction method of the present invention, the slab is attached with the slab inclined with the large hole facing upward, and then the streak is inserted into the large hole to attach each of the slabs. By fixing the step member at a predetermined position on the slab, the weight at the time of mounting the slab is reduced, and the construction is facilitated.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The concrete staircase of this embodiment is mounted with an inclination such that a flat slab 1 connects a landing 2 and a landing 3 above the landing 2.
A plurality of square pillar-shaped step members 4 are arranged side by side in a state oriented in the horizontal direction and fixed.

The slab 1 is made of precast concrete, and has a plurality of large holes 5 formed on an inclined upper surface thereof. The mortar 6 is applied to the upper surface of the slab 1, and the step members 4 are mounted on the mortar 6. Each of the step members 4 is made of precast concrete having a tread surface 7, a riser surface 8, and an inclined surface 9 inclined with respect to the tread surface 7. The non-slip 11 is driven into the tip of the tread 7. The inclined surface 9 is joined to the upper surface of the slab 1 by the mortar 6, and the stirrup 10 is inserted into the stud hole 5 so that each step member 4 is fixed on the slab 1. Fixed in position. The non-slip 11 may have a configuration in which a tile, rubber, metal, or the like is driven, but may have a configuration in which vinyl or the like is bonded.

In this concrete staircase, a vertical surface 12 is formed on each step member 4 so as to be opposed to the riser surface 8, and each step member 4 is located between each vertical surface 12 and the upper riser surface 8. Is provided, and a mortar 13 is embedded in this groove.

Such a concrete staircase can be constructed by a first method or a second method as described below.

If the first method is used, the slab 1
And the step member 4 is manufactured by precast concrete.

When the slab 1 is manufactured, first, as shown in FIG. 3, side molds 15 are fixed on four sides of a flat bottom mold 14 and a cylindrical thick mold is placed on the side mold 14. After fixing the boring form 16 in an upright state, assembling the slab form, and then assembling the slab reinforcing bar (not shown) in the slab form, concrete is put into the slab form. Cast in.
After the concrete in the form has solidified, the side form 15
Is removed from the bottom mold 14 and the molded body in the mold is taken out,
This is cured to form slab 1.

On the other hand, when the step member 4 is manufactured, first, as shown in FIG. 4, a bottom mold 17 in which a tread forming portion and a riser forming portion are formed to be recessed in an L-shaped cross section is formed at the upper portion. Is used to fix the side mold 18 for forming the vertical surface 12 at a desired position on the tread-forming portion to assemble the step member form, and then a reinforcing bar (not shown) is provided in the step member form. After assembling), concrete is poured into the form for the step member, and one end of the stirrup 10 is buried on the upper surface of the concrete. Then, after the concrete is solidified, the bottom form 17
Remove the side formwork 18 from and take out the molded body in the formwork,
This is cured to form a step member 4.

When the step member 4 is manufactured in this manner, the side mold
By changing the fixing position of 18, various step members 4 having different widths of the treads 7 can be manufactured, whereby various steps having different tread widths and rising heights can be produced by changing the intervals between the step members 4. It becomes possible.

When the step member 4 is formed, a void-shaped hollow portion 19 as shown by a broken line in FIG. 4 is formed by embedding a void form in which both ends of a paper tube or a thin iron plate tube are closed in concrete. Thus, the weight of the step member 4 may be reduced. In order to reduce the weight of the step member 4, not only the void type hollow portion 19 but also a channel type hollow portion 20 as shown in FIG. 5 may be formed. When forming hollow portions of various shapes, the mold may be buried, but it may be removed after the concrete has solidified as a blanking frame. Further, the weight of the step member 4 may be reduced by using ultra-light concrete or the like as the concrete.

When the weight of the step member 4 is reduced by such various methods, the attachment of the step member 4 to the slab 1 is facilitated, thereby facilitating the construction of the stairs.

Further, since the non-slip 11 made of a tile or the like can be easily driven into the step member 4, the step member 4 is finished after the non-slip 11 is driven and finished.
Can be attached to the slab 1.

After the slab 1 and the step member 4 are manufactured in this manner, the mortar 6 is placed on the upper surface of the slab 1 with the large holes 5 of the slab 1 facing upward, as shown in FIG.
Is applied and mortar is poured into the large holes 5, and then the large streaks 10 of the step member 4 are pushed into each large hole 5, and the inclined surface 9 of the step member 4 is placed on the mortar 6. Then, in this state, the mortar 6 and the mortar in the pit 5 are solidified, and the step members 4 are fixed at predetermined positions on the slab 1. After the step member 4 is attached to the slab 1 in this way, as shown in FIG.
Is lifted by a crane or the like, and is attached by tilting so that the landing 2 and the landing 3 are connected.

Further, in the case of constructing by the second method, first, the slab 1 and the step member 5 are formed in the same manner as in the first method described above.
After the slab is manufactured, the slab 1 is lifted by a crane or the like at the site as shown in FIG. 7, and the slab 1 is attached by tilting so that the landing 2 and the landing 3 are connected. Then, after the slab 1 is attached to the site in this way, as shown in FIG. 8, a mortar 6 is applied to the upper surface of the slab 1 and mortar is poured into the large holes 5, and then each large hole 5 The striated streak 10 of the step member 4 is pushed into 5 and the inclined surface 9 of the step member 4 is placed on the mortar 6. Then, in this state, the mortar 6 and the mortar in the pit 5 are solidified, and the step members 4 are fixed at predetermined positions on the slab 1.

[Effects of the Invention] According to the concrete stairs of the present invention, since the step member and the slab to which the step member is attached are each made of independent precast concrete, the production of the formwork is facilitated, and the step member and Slabs can be easily manufactured on site. In addition, since the step member and the slab are joined by the pits and the pits, the step member can be easily fixed to the slab, and the concrete stairs can be easily constructed.

According to the concrete stairs construction method of the present invention,
After inserting the stirrups into the stitches and fixing each step member at a predetermined position on the slab, the slab is attached with an inclination, so that the step member can be fixed while the slab is horizontal. Thus, the accuracy of the tread width and the rise surface height can be improved.

According to another concrete stairs construction method of the present invention, after the slab is attached with the slab inclined with its large hole facing upward, the large ridge is inserted into the large hole and the above slab is inserted into the large hole. Since each step member is fixed at a predetermined position on the slab, the weight at the time of mounting the slab is reduced, and the slab can be easily constructed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 9 are views showing an embodiment of the present invention. FIG. 1 is a sectional view of a main part of a concrete staircase, and FIG. FIG. 3 is an explanatory view for explaining a method for manufacturing a slab, FIG. 4, FIG. 5 is an explanatory view for explaining a method for manufacturing a step member, FIG. 6, and FIG. FIG. 8 and FIG. 9 are explanatory diagrams for explaining another method of constructing a concrete staircase. 1 ... slab, 4 ... step member, 5 ... big hole, 10 ... big streaks.

Claims (3)

(57) [Claims] 1. A flat slab made of precast concrete is mounted in an inclined state, and a large hole for fixing each step member made of precast concrete is formed on an inclined upper surface of the slab. The inclined lower surface is joined to the upper surface of the slab, and a crevice is buried in the lower surface of each step member, and this crease is inserted into the crevice hole of the slab, and each step member is placed on the slab. A concrete staircase fixed at a predetermined position. 2. A step member having a slope opposite to the tread surface is manufactured in advance by embedding a streak on the slope surface with precast concrete, and a flat plate for fixing each of the step members is provided. After forming a large hole on one side of the slab and manufacturing it by precast concrete, then, inserting the large crease in the large hole and fixing each step member at a predetermined position on the slab And a method of constructing a concrete staircase, wherein the slab is attached at an angle. 3. A step member having an inclined surface on the side opposite to the tread surface is made of precast concrete by embedding a streak on the inclined surface, and a flat plate member for fixing each of the step members. The slab is made of precast concrete with a large hole formed on one side of the slab, and then the slab is attached with the large hole facing upward, and then the large streak is removed. A method for constructing a concrete staircase, wherein the step members are inserted into holes and fixed at predetermined positions on the slab.