JP2707966B2 - Floor construction method using prestressed concrete plate as beam-side formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor construction method which uses only buried formwork as a beam formwork and a floor formwork, does not use a diversion formwork, saves resources, and simplifies construction of the formwork. It is about.

[0002]

2. Description of the Related Art In the construction of a floor of a reinforced concrete building, a precast reinforced concrete member or a steel plate form is used for a floor portion, thereby reducing the use of a diverted form and saving resources and constructing the form. However, the mainstream method is to use a converted formwork to assemble, disassemble and remove the formwork, and to use precast reinforced concrete members. The fact is that it has not advanced so much.

[0003]

In the conventional construction method, the diverted formwork (plywood formwork) and the timber that reinforces it are diverted several times, but after that they have to be treated as industrial waste.
This is not preferable from the viewpoint of resource saving. In addition, assembling the formwork, installing the support, dismantling, and removing the structure require a great deal of work.

[0004]

SUMMARY OF THE INVENTION The present invention uses a buried form in place of a diverted form in the construction of a beam, thereby eliminating waste and simplifying the construction of the form. is there.

That is, the present invention provides a prestressed concrete plate comprising a thin web in which a welding wire mesh is buried and ribs provided above and below the web, in which a PC steel material to which a tension is introduced is buried. To form a beam-side formwork, form the formwork with the beam-side formwork, the buried beam bottom formwork, and the buried floor formwork, perform predetermined reinforcing arrangements and intermittent connection between the beam-side formwork upper edges. After that, the concrete is cast and the floor method is applied.

The gist of the present invention is that a precast concrete plate which is as light as possible and which can sufficiently withstand a floor load and a beam load is used as a beam-side formwork and is used as a buried formwork.

Therefore, a prestressed concrete plate is selected as a precast concrete plate, and the prestressed concrete plate is a thin concrete plate reinforced with a welding wire mesh and provided with ribs on the upper and lower sides.
The ribs are buried with PC steel to which tension is applied. Since it is a prestressed concrete plate, it is a thin product and relatively lightweight, but can withstand floor loads and beam loads. The prestressed concrete plate forms a part of the skeleton together with a reinforced concrete member to be cast later and bears a load. It is preferable that the prestressed concrete plate is further reinforced by providing vertical ribs in addition to the upper and lower ribs.

In the present invention, the buried formwork is used for both the beam bottom formwork and the floor formwork, and the diversion formwork is not used. As such a buried formwork, an ordinary steel plate with a built-in reinforcing steel or a steel plate-discarded formwork is used. The beam bottom formwork and the floor formwork may be the same or different.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows columns, girders,
This shows the arrangement and connection of small beams, (a) is a plan view,
(B), (c) is an arrow A view of (a).

FIG. 2 shows several examples of small beams or girders without small beams. FIGS. 2 (a), 2 (b) and 2 (c) are longitudinal sectional views.

FIGS. 3A and 3B show a joint portion of a large beam on which a small beam is bridged. FIG. 3A is a vertical sectional view of the small beam, FIG. 3B is a view of the arrow A in FIG. 3A, and FIG. FIG.

An example of a construction procedure according to the present invention will be described with reference to FIGS. 1, 2 and 3.

(1) The formwork of the pillar 1 is installed.

(2) In the prestressed concrete plate to be used, a connecting nut or a steel plate piece is buried at a predetermined position during manufacture. The bottom of the two prestressed concrete plates 2A, 2A is connected to a narrow lower connecting steel plate 8B.
And several places in the longitudinal direction are connected at appropriate intervals (1-2 m) by bolts 10. In this example, the lower connecting steel plate 8
B is bent at substantially right angles at both ends and connected to the two prestressed concrete plates 2A and 2A by bolts. The beam bottom form 9A is laid on the lower connecting steel plate 8B, and the beam form is assembled and bridged over the column form. If there are only large beams and no small beams, installation of beam formwork is completed.

(3) When bridging small beams between girders,
As in the case of the girder, the bottoms of the two prestressed concrete plates 2B, 2B are connected by the lower connecting steel plate 8B, and a beam bottom form 9B is laid thereon, and a small beam form is assembled and bridged over the girder form. . At this time, as shown in FIG. 3, an opening 16 is provided in the web portion of the girder-side formwork at the joint between the girder formwork and the small beam formwork, and L-shaped steel 17 is fixed along the left and right sides of the opening 16. The beam bottom form 9B has an opening 1 from the small beam form side.
6 so as to cover the lower edge. Both means prevent concrete leakage at the joint. The L-shaped steel 17 also serves to reinforce the opening 16.

(4) The floor form 3 is laid over the beam form.

(5) The beam bars 12A and 12B and the stirrups 13A and 13B are installed.

(6) The upper surfaces of the girder-side formwork 2A, 2A and the small beam-side formwork 2B, 2B are connected at appropriate intervals (1 to 2 m) by the upper connection steel plate 8A at appropriate intervals (1-2 m).

(7) Arrange slab muscles (not shown).

(8) The concrete 11 is cast.

The beam and the floor are completed as described above.

In the above-described construction procedure, an example has been described in which the girder formwork and the small beam formwork are sequentially assembled, and then the beam reinforcement and the stirrup are arranged. However, the large beam formwork or the small beam formwork is assembled in advance. A method of bridging it, further assembling a girder formwork and a small girder form at once and bridging it, or attaching a reinforcing bar and an upper connecting steel plate to a girder formwork or a small girder form in advance Numerous methods are adopted, such as a method of reducing the rebar arrangement work at the site by bridging it, and a method of combining these methods.

Before the concrete is cast, it is preferable to install a support 4 at the end of the small beam formwork and at the joint of the large beam form with the small beam formwork as shown in FIG.

FIG. 1 and FIG. 2 will be supplemented. FIG. 1 (b)
Fig. 1 (c) shows an example in which a prestressed concrete plate having upper ribs 5A and lower ribs 5B and not having vertical ribs 5C is used as the small beam side formwork 2B. This is an example in which a prestressed concrete plate having both 5A, lower rib 5B, and vertical rib 5C is used.

FIGS. 2 (a) and 2 (b) show an example in which reinforcing bars are arranged on site, and FIG. 2 (a) is assembled so that the ribs of the prestressed concrete plate are outside the beam side frames 2A and 2B. Example (b) is an example in which the ribs of the prestressed concrete plate are assembled so as to be inside the beam-side forms 2A and 2B. FIG. 2 (c) shows an example in which the reinforcing bars are attached to the beam form in advance, and the beam forms are assembled so that the ribs of the prestressed concrete plate are outside the beam side forms 2A and 2B. This is an example in which the stirrup 13B is welded to the buried steel plate 14 buried in the beam-side formwork 2A, 2B via the reinforcing bar support hardware 15.

[0027]

According to the present invention, only the buried formwork is used as the beam formwork and the floor formwork, and no diverted formwork is used. This saves resources and simplifies the construction of the formwork.

[Brief description of the drawings]

FIG. 1 shows the arrangement and connection of columns, girders, and small beams at the time of construction according to the present invention.
(C) is an arrow view of (a).

FIG. 2 shows several examples of a small beam or a girder without a small beam, and (a), (b), and (c) are all longitudinal sectional views.

FIG. 3 shows a joint between both girders on which a girder spans,
(A) is a longitudinal sectional view of a small beam, (b) is a view of an arrow A of (a),
(C) is an arrow B view of (a).

[Explanation of symbols]

1 ... Pillar, 2A ... Large beam side formwork, 2B ... Small beam side formwork,
3 ... buried floor formwork, 4 ... support, 5A ... top rib,
5B ・ ・ Lower rib 、 5C ・ ・ Vertical rib 、 6 ・ ・ Welded wire mesh 、 7
··· PC steel material, 8A ··· Upper connected steel plate, 8B ··· Lower connected steel plate, 9A ··· giant beam bottom formwork, 9B ···
0 ・ ・ Bolt, 11 ・ ・ Concrete, 12A ・ ・ Girder reinforcement, 12B ・ ・ Girder reinforcement, 13A ・ ・ Girder stirrup,
13B ・ ・ Stirrup of small beam 、 14 ・ ・ Buried steel plate 、 15
..Reinforcing bar support hardware, 16 ... openings, 17 ... L-shaped steel.

Claims (2)

(57) [Claims] 1. A prestressed concrete plate comprising a thin web in which a welding wire mesh is buried and ribs provided above and below the web, and a prestressed concrete plate in which a tension-introduced PC steel material is buried in a rib portion. After forming a formwork with the beam-side formwork, the buried beam-bottom formwork, and the buried floor formwork and performing intermittent connection between predetermined reinforcing bars and the upper edge of the beam-side formwork, the concrete Floor construction method. 2. The floor according to claim 1, wherein an opening for intersection with the small beam portion is provided in the thin web portion, and a prestressed concrete plate having L-shaped steel fixed to the outside along the left and right sides of the opening is used as the girder-side formwork. Construction method.