JP3490170B2 - Method of manufacturing concrete 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 manufacturing a concrete board .

[0002]

2. Description of the Related Art Since stairs, balconies, etc. require handrails, handrail mounting recesses for mounting the handrails are formed in the concrete boards of the stairs and balconies.

As shown in FIG. 10, a conventional handrail mounting recess has a sheath tube 21 embedded in the end of a staircase or a balcony, and a rail is inserted in the sheath tube 21 to attach a handrail. It was

[0004]

However, since the handrail mounting recesses are formed by the sheath tube as described above, it is costly if the handrail mounting recesses are provided in the concrete plate and the sheath tube is filled with the handrail mounting recesses. There is a problem that the handrail cannot be firmly attached because the adhesion between the mortar and the sheath tube is not sufficient.

The present invention has been made in view of these problems, and an object of the present invention is to provide concrete with a handrail mounting concave portion to which a handrail can be firmly mounted without cost.
It is to provide a method for manufacturing a plate .

[0006]

[Means for Achieving the Object] The method for producing a concrete plate of the present invention for achieving the above-mentioned object is
The air bag is covered with a protruding air cushion sheet
Forming frame for handrail mounting recess in the mold for concrete board
The concrete is placed in the formwork and
After removing the mold, remove the mold and attach the handrail.
Characterized in that the recess forming frame is manufactured by demolding,
Remove the uneven sheet from the frame for the handrail mounting recess.
It is to have a structure characterized by being present.

[0007]

The handrails are firmly attached by providing handrail mounting recesses at appropriate intervals at the upper end of the concrete plate body and forming irregularities on the inner surface of the handrail mounting recesses.

By forming the handrail mounting concave portion having an uneven inner surface on the concrete board for stairs consisting of the step board and the landing board, the stair handrail can be firmly mounted.

By forming the handrail mounting concave portion having an uneven inner surface on the concrete plate for the balcony, the handrail mounting of the balcony can be firmly performed.

A handrail mounting recess forming frame whose outer surface is covered with an uneven sheet is installed in a mold for a concrete plate, concrete is placed in the mold, and after hardening, the mold By removing the frame and removing the handrail mounting recess forming frame to manufacture a concrete plate, a concrete plate having a handrail mounting recess with an uneven surface on the inner surface can be easily manufactured at low cost. .

By making the uneven sheet detachable from the handrail mounting recess forming frame, the handrail mounting recess forming frame can be easily removed from the mold, and the handrail mounting recess can be easily formed even at the bent portion of the member. Can be formed into

Since the uneven sheet is an air cushion sheet formed by projecting innumerable air bags on its surface, the uneven portion on the inner surface of the handrail mounting concave portion can be easily formed.

[0013]

EXAMPLES The concrete board of the present invention will be described below using a precast concrete board for stairs and a precast concrete board for balconies. FIG. 1 is a perspective view of a precast concrete board for stairs, FIG. 2 is a side view of the same, FIG. 3 is an enlarged cross-sectional view of the relevant portion, and FIG. 4 is a plan view of the same.

Precast concrete board for stairs 1
As shown in FIG. 1 and FIG. 2, is composed of a step plate 2, an upper landing plate 3 and a lower landing plate 4, and handrail mounting recesses 5 are formed at their ends.

The handrail mounting recess 5 is for inserting the lower part of the taper, and the opening is formed in a wide rectangular plane, and the uneven portion 6 is formed on the inner surface thereof.

The uneven portion 6 strengthens the adhesion of the mortar filled in the handrail mounting concave portion 5, and is formed in a wave shape as shown in FIG. 3 (1). Further, as shown in (2) and (3) of the same figure, the uneven portion 6 is formed by providing a cotter 6a on the inner surface, and is formed by alternately providing streaky concave portions 6b and convex portions 6c. It is also possible to form the stripe-shaped concave portions 6b and the convex portions 6c so as to intersect with each other.
Further, the handrail mounting recess 5 is not limited to a plane rectangular shape, but may be formed in a plane circular shape.

FIG. 4 shows a balcony precast concrete board 7 in which a handrail mounting recess 5 is formed in a rising portion 8. The handrail mounting recess 5 has the same structure as the precast concrete board 1 for stairs and is formed by the same method.

Further, FIG. 5 shows a precast concrete board 10 for a balcony in which a handrail mounting recess 5 is provided in a rising portion 8 of a bent portion 9. Since the handrail mounting concave portion 5 is directly formed on the precast concrete board 10, even the bent portion 9 can be easily formed.

Although the concrete board of the present invention has been described by using the precast concrete board, this is not limited to the precast concrete board.
Of course, it can also be applied to cast-in-place concrete boards.

Next, a method for manufacturing a concrete board will be described by using precast concrete for stairs.

First, as shown in (1) and (2) of FIG. 6, the formwork 11 of the precast concrete board 1 for stairs.
The handrail mounting recess forming frame 12 is installed in the. This installation position is the installation position of the handrail, that is, the end of the step plate 2, the upper landing plate 3 and the lower landing plate 4.

The handrail mounting recess forming frame 12 includes a box body 13,
It is composed of an upper lid 14 and a bottom lid 15 that close the upper opening and the lower opening of the box 13.

A fastening rod 16 penetrating the upper lid 14 is screwed into the bottom lid 15, and a nut 17 of the fastening rod 16 is engaged.
The upper lid 14 and the bottom lid 15 are closed by tightening.

Further, the outer surface of the box 13 is covered with an uneven sheet, that is, a sheet called polyethylene air cushion sheet 18 having an air bag 18a protruding from the surface thereof. As shown in FIG. The upper end of the seat 18 is attached to the upper lid 14, and the lower end of the seat 18 is attached to the lower lid 15.

Accordingly, by closing the upper lid 14 and the lower lid 15, the air cushion sheet 18 is attached to the outer surface of the box body 13. The upper lid 14 and the lower lid 1
5 and open the air cushion sheet 18 box 13
It can be removed from the outer surface of the.

After the concrete 19 is placed in the mold 11 in which the handrail mounting recess forming frame 12 is thus set and hardened, the mold 11 and the handrail mounting recess forming frame 12 are released from the mold. .

The demolding of the handrail mounting recess forming frame 12 is as follows.
As shown in FIG. 8, the upper lid 14 is loosened, the tightening rod 16 is removed from the bottom lid 15, and the box 13 is pulled out.
Since the box 13 is in contact with the concrete 19 through the air cushion sheet 18, it can be easily pulled out.

When the box 13 is pulled out, the bottom cover 15 and the air cushion sheet 18 remain, but since the air cushion sheet 18 is made of polyethylene, it can be easily peeled off by pulling the upper end portion. In this case, if a release agent is applied to the surface of the air cushion sheet 18, it can be peeled off more easily.

When the air cushion sheet 18 is peeled off in this manner, the handrail mounting recess 5 having the uneven portion 6 formed on the inner surface is formed. The uneven portion 6 is composed of a cotter 6a formed of the air bag 18a of the air cushion sheet 18.

The method of manufacturing the precast concrete plate has been described by using the precast concrete plate 1 for stairs, but of course the precast concrete plate 7 for balconies can be manufactured by the same method.

Further, since the handrail mounting recess 5 can be formed by the method described above, even if the precast concrete board 10 is bent as shown in FIG. 5, the handrail mounting recess 5 can be easily formed in the rising portion 8. it can.

In FIG. 9, the handrail mounting recess forming frame 12 is formed into the formwork 1.
1 shows a method of forming the handrail mounting recess 5 by installing it on the bottom surface of the handrail 1. Also in this case, if the handrail mounting recess forming frame 12 is demolded after the mold 11 is demolded, the handrail mounting recess 5 is formed. Can be formed.

Although the method for producing a concrete board of the present invention has been described using a precast concrete board,
This is applicable not only to precast concrete boards but also to cast-in-place concrete boards.

[0034]

EFFECTS OF THE INVENTION The handrail mounting recesses are provided at appropriate intervals at the upper end of the concrete plate body, and the concavo-convex portion is formed on the inner surface of the handrail mounting recess, so that the handrail can be firmly mounted.

The stair handrail can be firmly attached by forming the handrail mounting concave portion having the uneven portion on the inner surface of the concrete plate for the stairs, which comprises the step plate and the landing plate.

By forming the handrail mounting concave portion having the uneven portion on the inner surface of the concrete plate for the balcony, the balcony handrail can be firmly mounted.

A handrail mounting recess forming frame whose outer surface is covered with an uneven sheet is installed in a mold for a concrete plate, concrete is poured into the mold, and after hardening, the mold By removing the frame and removing the handrail mounting recess forming frame to manufacture a concrete plate, a concrete plate having a handrail mounting recess with an uneven surface on the inner surface can be easily manufactured at low cost. .

By making the uneven sheet detachable from the handrail mounting recess forming frame, the handrail mounting recess forming frame can be easily released from the mold, and the handrail mounting recess can be easily formed even at the bent portion of the member. Can be formed into

Since the uneven sheet is an air cushion sheet formed by projecting innumerable air bags on its surface, the uneven portion on the inner surface of the handrail mounting concave portion can be easily formed.

[Brief description of drawings]

FIG. 1 is a perspective view of a precast concrete board for stairs.

FIG. 2 is a side view of a precast concrete board for stairs.

[Fig. 3] (1) is a precast concrete for balconies.
Enlarged sectional views of the main parts of the heating plate, (2) and (3)
Sectional view with part of handrail mounting recess omitted, (4) is the same plane
It is a figure.

FIG. 4 (1) is an enlarged cross-sectional view of a main part, and (2) is a plan view of the same.
Is.

5 (1) is an enlarged cross-sectional view of a main part of a precast concrete plate for a balcony, and FIG. 5 (2) is a plan view of the same.

FIG. 6 (1) is a sectional view showing a method for manufacturing a precast concrete plate, and FIG. 6 (2) is the same plane.

FIG. 7 is a partially omitted enlarged cross-sectional view of a handrail mounting recess forming frame.

FIG. 8 is a cross-sectional view of the precast concrete board in a state in which the mold frame and the handrail mounting recess forming frame have been demolded.

FIG. 9 is a cross-sectional view showing a method of manufacturing by installing a handrail mounting recess forming frame on the bottom surface of the mold.

FIG. 10 is a cross-sectional view of a conventional concrete board.

[Explanation of symbols]

1 Precast concrete board for stairs 2 steps 3 Upper landing board 4 Lower landing board 5 Handrail mounting recess 6 uneven parts 7 Precast concrete boards for balconies 8 rising part 9 Bending section 11 Formwork 12 Handrail mounting recess forming frame 13 Box 14 Top lid 15 Bottom lid 18 air cushion seat

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04C 2/00-2/54 E04B 1/00-1/36 E04F 11/00-11/18

Claims (2)

(57) [Claims] 1. An air cylinder having innumerable air bags protruding from the surface thereof.
Forming a frame for handrail mounting recesses covered with an option sheet,
It is installed in the formwork for concrete board, and the concrete is placed in the formwork.
Depress the formwork after placing the reet and curing it
In addition, the handrail mounting recess forming frame was released from the mold
A method for manufacturing a concrete plate, comprising: 2. The method for manufacturing a concrete board according to claim 1, wherein the uneven sheet is removable from the handrail mounting recess forming frame.