JPH0821000A - Method of making structure provided with free end - Google Patents

Abstract

PURPOSE:To enhance work efficiency and reduce cost by using an SFC board as a form which shapes up a parapet and a drain gutter and using the form as a part of a structure after having cast concrete as it is. CONSTITUTION:A front board 7 is mounted to an end surface 4a of a half PC board 4 with a clamp 8. On one hand, a cross section-U-shaped support metal fitting is fastened with a long screw concrete 12 buried vertically in the half PC board 4 with a bolt metal fitting 13, thereby fixing ditch side boards 9 and 10. Embedded bolts 14 and 15 are buried into the ditch side boards 9 and 10 respectively. Furthermore, the ditch side board 9 which is wider is connected to the front board 7 with a connector 18. The half PC board is supported with a timbering. Stab upper end reinforcing bars or reinforcing bars and parapet reinforcing bars are welded with a reinforcement assembled body 4c of the half PC board 4 and then concrete is placed into the ditch side board 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a structure such as a balcony or a corridor having a parapet and a drain at a free end thereof.

[0002]

2. Description of the Related Art Conventionally, when constructing a cantilevered structure or a structure having at least one free end, such as a balcony or a corridor with at least one open, concrete bars are conventionally arranged with various shapes of reinforcing bars. It was placed. However, in this case, because the entire floor is made of cast-in-place concrete,
The supporting work is time-consuming and costly, and the time required for forming and arranging the reinforcing bars according to the shape of the structure is large, and the area is costly.

Therefore, recently, a synthetic floor construction method has been adopted in this field as well, in which concrete is laid on the upper part of a ready-made half PC board with the required reinforcement.

[0004]

However, even with this construction method, in the case of constructing a structure having a parapet or a drain groove at the free end, the use of a custom-made half PC plate increases the cost, and the free end is In the case of using a conventional formwork, the structure is complicated and it takes time to manufacture and assemble, and the advantages of the composite floor construction method with a good corner have not been fully utilized.

That is, as shown in FIG. 4, when a half PC plate (a) integrally molded to the free end portion is used, a rebar assembly (b) having a special shape for reinforcing a parapet and a drain groove is incorporated. A half PC board is required. Therefore, there are problems that mass production is difficult and the cost is high, the protruding portion is damaged during transportation, the volume is large, and extra transportation cost is required. Further, as shown in FIG. 5, when a general-purpose half PC board (C) is used, the parapet and the drain groove (D) are made into a mold with a control panel (E), but the structure is not very efficient, and it takes time and effort. It was a costly task. In FIG. 4 and FIG. 5, reference numeral (f) indicates a supporting work made of joists or Daihiki, and (g) indicates cast-in-place concrete. In addition, the formwork and supporting work for the beam portion were omitted.

[0006]

The inventors of the present invention completed the present invention as a result of diligent research, and a characteristic of the present invention is that SFC is used as a formwork for forming a parapet and a drain in a synthetic floor construction method. A plate is used, and it is securely supported by simple metal fittings, and after the concrete is poured, the form is used as it is for a part of the structure. Therefore, it has become possible to provide a construction method that has advantages in workability, construction period, and cost.

The method of the present invention will be described below. First, in the present invention, the half PC board is a thin-walled reinforced concrete floor board in which a reinforcing bar assembly is driven, and the SFC board is
It is a thin concrete plate that uses steel fibers instead of steel bars. The parapet referred to in the present invention has a low height (about 300 mm or less), and if necessary, a metal handrail or the like is attached to the upper part thereof.

The half-PC board used in the present invention has a thickness of 5
It is a flat plate with a size of 0 to 100 mm. This half P
After the C plate is supported by the support work, the slab upper end bar is connected to the reinforcing bar assembly projecting above it, and the reinforcing bar that forms the beam and these reinforcing bar assembly and the slab upper bar Connect or arrange the reinforcing bar of the parapet part. In addition, SFC
The plate is a concrete flat plate in which a steel fiber is mixed and reinforced by a known method and has a thickness of about 10 to 40 mm, more preferably about 25 to 30 mm. This SFC
The plate is used as a front plate that constitutes the outer side surface of the parapet and as two groove side plates that also constitute the inner wall surface of the drainage groove.
The front plate is attached to the screw plug embedded in the end surface of the half PC plate with a tightening metal fitting. On the other hand, the groove side plate is attached by mounting it in parallel with a support bracket having a U-shaped cross section, and then supporting the support bracket with a bolt bracket on a long screw connector embedded in the upward direction of the half PC plate. These front plates and groove side plates will be left as they are and will be used as formwork after concrete is cast. The thickness of the obtained synthetic bed is about 15 to 30 cm, depending on the type and size of the structure.

The front plate and the groove side plate can be attached by using various embedded or detachable metal fittings other than the above-mentioned screw connector.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 to 3 show an example of a case where the present invention is carried out, in which a balcony 3 having a parapet 1 having a low height and a drain groove 2 is constructed. First,
FIG. 1 shows only the half PC plate 4, and shows a state in which a mold for forming the parapet 1 and the drainage groove 2 is assembled at this free end, and FIG. 2 is an enlarged view of the main part thereof. . Then, as shown in FIG. 3, slab upper end reinforcements, reinforcement reinforcements, and the like are arranged on the upper part of the half PC board 4, and then concrete is poured to complete the balcony 3.

As shown in FIGS. 1 and 2, the half PC board 4
A screw connector 5 is embedded in the front end surface 4a of the front plate 4a, and a front plate 7 is tightly attached to the front end surface 4a via a rubber packing 6 by a tightening metal fitting 8. This rubber packing 6
Is for filling the gap between the front end face 4a of the half PC plate and the front plate 7, and may be removed when the construction is completed or may be left as it is. The screw capacitors 5 are embedded at intervals of about 150 to 200 mm. As the half PC board 4, for example, one having a thickness of about 65 mm is used. The half PC plate 4 is a factory product obtained by placing concrete on a welded reinforcing bar assembly 4c at the bottom end slab 4b of the slab. The reinforcing bar assembly 4c of this example includes a top bar 4d, a lattice bar 4e, and a bottom bar 4f.

On the other hand, the groove side plates 9 and 10 are mounted in parallel with a support fitting 11 having a U-shaped cross section, and the support fitting 11
Is a long screw connector 12 embedded in the half PC board 4 upwards.
Tighten with bolts 13 to fix. Long screw control 1
2 is also buried at intervals of about 150 to 200 mm. The groove side plates 9 and 10 have embedded bolts 14 and 1 respectively.
5 is embedded, and these bolts 14 and 15 are passed through the through holes of the support fitting 11 and are tightened and fixed by nuts 16 and 17. The wider groove side plate 9 forms the inner wall surface of the parapet 1 by pairing with the front plate 7, and is connected to the front plate 7 by a connecting fitting (separator) 18. Reference numeral 19 is an embedded bolt embedded in the front plate 7, and reference numeral 20 is an embedded bolt embedded in the groove side plate 9. Front plate 7 and groove side plates 9, 1
As 0, for example, one having a thickness of about 25 mm is used.

Next, as shown in FIG. 3, the half PC board 4 is supported by a support 21 composed of joists, large pulls, and support rods, and the reinforcing bar assembly 4c of the half PC board 4 has slab upper end reinforcements 22 and reinforcement reinforcements. After welding 23 and the parapet part rebar 24, concrete 25 is cast to the inside of the groove side plate 10 with a thickness of about 14 cm, and the construction of the balcony 3 by the synthetic floor construction method with a thickness of about 20 cm is completed. In the figure, reference numeral 26 is a beam reinforcing bar. Further, concrete 25 is poured between the front plate 7 and the groove side plate 9 to form the parapet 1 portion. The drain groove 2 is also formed by thinly pouring concrete between the groove side plate 9 and the groove side plate 10. The front plate 7 and the groove side plates 9 and 10 may be attached to the half PC plate 4 before or after they are supported by the supporting work, but the former is more efficient.

Since the front plate 7 and the groove side plates 9 and 10 can be left as they are as an embedded formwork, the parapet 1 and the drainage groove 2 can be removed by pouring concrete, leveling it, then drying it and removing the supporting structure. The surface of the provided balcony will only be finished after it is completed. A handrail pipe may be embedded and fixed on the upper surface of the parapet 1.

Although the balcony has been described above, a corridor, a passageway, etc., at least one of which is open, can be constructed in the same manner.

[0016]

As described above, according to the present invention, the half P
In a synthetic floor construction method using a C plate, an SFC plate is used as a formwork for forming a parapet and a drainage groove, and after pouring concrete, the formwork is directly used as a part of a structure as a discard formwork. Therefore, it is not necessary to use a half-PC board with a special structure in which a parapet or drainage groove is formed in advance on the free end, and there is no need to assemble a conventional formwork on the free end or extra work called demolding. , The floor with free ends such as balconies, bay windows, and corridors can be easily constructed by the synthetic floor method with extremely high degree of freedom.

In particular, the front plate made of SFC plate is attached to the screw control embedded in the end surface of the half PC plate with a fastening metal fitting, and two SFC plates are attached.
The FC plate groove side plate is attached to the U-shaped support metal fittings, and the support metal fittings are supported by bolt metal fittings on the long screw connector embedded in the half PC plate upwards, thereby significantly improving work efficiency and realizing cost reduction. There is an effect that can be done. It has the feature that it can be constructed very easily and without cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a portion of a half-PC board that constitutes a balcony.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a transverse cross-sectional view of a balcony in which concrete is poured.

FIG. 4 is a transverse cross-sectional view showing an example of construction of a balcony by a conventional synthetic flooring method using half PC boards.

FIG. 5 is a cross-sectional view showing another example of the construction of a balcony by the conventional synthetic floor method using half PC boards.

[Explanation of symbols]

 1 Parapet 2 Drainage groove 3 Balcony 4 Half PC board 7 Front plate 8 Tightening fitting 9 Groove side board 10 Groove side board 11 Support fitting 21 Supporting work 25 Concrete

Claims (2)

[Claims] 1. A mold for forming a parapet and a drain groove in the case of constructing a structure having a parapet and a drain groove at a free end by placing a required reinforcement on the upper part of a half PC plate and placing concrete. A method for constructing a structure having a free end, characterized in that an SFC plate is used as a frame, and after pouring concrete, the form is used as it is as a part of the structure. 2. A front plate made of SFC plate that constitutes the outer side surface of the parapet is attached to the screw control embedded in the front end surface of the half PC plate with a tightening metal fitting, while two SFC plates that form the inner wall surface of the drainage groove are made. 2. The free end portion according to claim 1, wherein the groove side plate is attached to a U-shaped support metal fitting, and the support metal fitting is supported by a bolt metal fitting on a long screw connector embedded upward in a half PC board to form a mold. How to build a structure with.