JPH0932172A - Precast floor plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply join the ends of precast floor plates formed in advance in a factory and arranged on steel frame beams, in a specified strength, with the steel frames and with each other when constructing a slab structure of a steel frame building by use of the precast floor plates to place construct ion-materials thereon. SOLUTION: Cotters 11 constituted of protrusions 11a and recessions 11b are formed at four sides and at least one hole 12 for inserting dowel bars is formed in each protrusion 11a. The reinforcement arrangement part is constituted of reinforcements 13 arranged around the holes 12 and slab reinforcements having U-shaped reinforcements so as to surround the holes 12. And further, the U-shaped reinforcements are arranged at the reinforcements 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast floorboard, and more particularly to a precast floorboard for constructing a slab by arranging them on a steel beam facing each other in a steel frame building.

[0002]

2. Description of the Related Art Conventionally, a method of constructing a slab, that is, a floor, in a steel frame building is constructed by laying a deck plate after the steel frame is built, and laying a wire mesh or a reinforcing bar on the deck plate and placing concrete. Was common.

[0003]

However, in the conventional method for constructing a slab as described above, it is impossible to practically place materials and the like until the concrete is laid and placed on the deck plate. It was necessary to provide a temporary gantry to put work materials separately. In addition, the lifting of materials is complicated during finishing work and equipment work after floor construction, and it is necessary to add lifting equipment to solve this, which causes a delay in construction period and an increase in construction costs. Was there.

An object of the present invention is to solve the above-mentioned conventional problems, and is a precast floor board formed in advance in a factory or the like, which is used for constructing a slab of a steel frame building, An object of the present invention is to provide a precast floorboard which allows the end portions of the precast floorboards arranged on the steel beams to be easily and with a predetermined strength and to be placed with materials and the like.

[0005]

The present invention is a precast floorboard, which is configured as follows in order to solve the above-mentioned technical problems. That is, the precast floorboard of the present invention is a cotter portion formed on four sides and consisting of a convex portion and a concave portion, and at least one hole for inserting a dowel muscle formed in each convex portion of each of the cotter portions, and the hole. A reinforcing bar arranged around the hole and a slab bar having at least a slab bar having a U-bar bar arranged so as to surround the hole, wherein the U-bar bar of the slab bar is the It is characterized in that the reinforcing bars are arranged (corresponding to claim 1).

Further, the precast floorboard of the present invention comprises a cotter portion which is formed on four sides and which is formed by a convex portion and a concave portion, and at least one hole for inserting a gibber line formed in each convex portion of each of the cotter portions. A reinforcing bar arranged around the hole and a slab bar having a U-shaped reinforcing bar arranged so as to surround the hole, and a pair of opposed cotter sections are relatively And a beam that is pre-mounted so that
A type rebar part is reinforced with the reinforcing bar, and the girder bar with the beam and the precast floor plate fixed to the beam is positioned in the hole of the cotter part, and non-shrink mortar is struck in the hole. It is integrated by being installed (corresponding to claim 2).

<Additional Structure of the Present Invention> The precast floorboard of the present invention is composed of the above-mentioned essential components, but it is also established when the components are specifically as follows. With the additional component, the hole for the insertion of the gibber line provided in the convex part of the cotter part is a form and reinforcing plate formed by forming a thin iron plate in a cylindrical shape, and a reinforcing bar is provided around its outer periphery. It is wound and fixed, and it is placed at a predetermined position between the surface molds for the precast floorboard, and when the concrete filled in the space surrounded by these surface molds and other side molds hardens, the surface molds Also, the side-face mold is released from the mold, but the mold / reinforcement plate used for forming the hole is formed by being buried as it is (corresponding to claim 3).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The precast floorboard of the present invention will be described below in more detail with reference to the embodiments shown in the drawings.
The precast floorboard (hereinafter simply referred to as floorboard) 10 according to this embodiment is a panel that is mass-produced in a factory or the like, and is generally a reinforced concrete panel. This is called a precast floorboard when it is formed so as to be used as a floor of a building.

The floor board 10 has cotter portions 11 formed on four sides. This cotter unit 11 is shown in FIG.
As shown in FIGS. 2 and 3, the convex portion 11a and the concave portion 11b
It means the part which formed alternately. Each of the protrusions 11a of the cotter portion 11 has a hole 1 penetrating the front and back of the floor plate 10.
At least one 2 is formed.

The hole 12 is for inserting a gibber line using a stud bolt or the like, and is therefore formed with a diameter larger than that of the gibbel line. As a reinforcing structure inside the floor plate 10, a slab having reinforcing bars 13 spirally arranged around the hole 12 and a U-shaped reinforcing bar portion 14a arranged so as to surround the hole 12. At least the muscle 14 is provided. The above-mentioned reinforcing bar 13 is arranged on the U-shaped reinforcing bar portion 14a of the slab bar 14.

Such a precast floorboard 10 is formed by using a form as is conventionally done. At that time, the perforations 12 for inserting the gibel reinforcement provided in the convex portion 11a of the cotter portion 11 are formed by arranging a cylindrical formwork between the opposing surface formworks, and the reinforcing bar 13 is provided in the cylindrical formwork. It is reinforced by placing it around. Of course, in this case, the cylindrical formwork for forming the holes 12 is removed from the completed precast floorboard 10 together with the other formwork.

However, the hole 12 for inserting the gibber muscle and the reinforcing muscle 13 around it can also be formed by the following method. That is, as shown in FIG. 4, a thin iron plate is formed into a cylindrical shape, and a formwork / reinforcement plate 19 for a hole for inserting a dowel reinforcement
The spiral reinforcing bar 13 is wound around the outer periphery of the reinforcing member 13 so that each part is fixed to the extent that it does not separate.

A formwork / reinforcement plate 19 having such reinforcement bars 13 is arranged at a predetermined position between the surface molds for the precast floorboard. Then, for example, concrete is filled in the space surrounded by these surface formwork and other side formwork. At this time, needless to say, necessary rebars such as slabs are naturally provided in the space.

After that, when the concrete is hardened, the surface mold and the side mold are removed. However, the formwork / reinforcement plate 1 used to form the hole 12 for inserting the dowel
9 is buried as it is. When the precast floorboard 10 is formed in this manner, the reinforcement bar 13 and the installation of the form for forming the gibber insertion hole and the subsequent treatment are very simple, and the efficiency of manufacturing the precast floorboard is improved.

A method for constructing a building slab using such a precast floorboard 10 will be introduced for reference. First, as shown in FIG. 5, a plurality of precast floorboards 10 are installed on the steel beam 15 so that the convex portions 11a and the concave portions 11b of the cotter portion 11 mesh with each other. After that, the dowel streak 16 is inserted from the hole 12 provided in the convex portion 11a of the cotter portion 10 of each precast floor board 10, and
Stick to and stand upright.

Then, a non-shrinkable mortar 18 is placed in the hole 12 of the cotter portion 11 in which the gap 17 of the cotter portion 11 of the adjacent precast floor plate 10 and the gibber streak 16 are inserted. As a result, the end portions of the precast floorboard 10 placed on the steel beam 15 so as to face each other are joined together and at the same time integrated with the steel beam 15, thereby forming a slab.

In the construction example described above, the precast floor boards 10 are arranged on the steel beam tops 15 and then the gibber 16
The steel beam 15 into the hole 12 formed in the cotter portion 11.
However, it is also possible to fix the gibber streak 16 on the steel beam 15 at a predetermined position in advance. In this case, the "predetermined position" is the position on the steel beam 15 where the holes 12 of the cotter portion 11 are located by design when the precast floorboards 10 are arranged on the steel beam 15.

The construction of such a slab can also be performed by the following method. In this other slab construction method, the precast floorboard 2 according to another embodiment of the present invention is used.
Use 0. That is, first, the above-mentioned precast floorboard 10 and the precast floorboard 20 with crossbeams in which the crossbeams 15b are previously attached to this precast floorboard as shown in FIG. 6 are manufactured and prepared in advance in a factory.

The precast floor board 20 with crossbeams is constructed as follows. That is, the beam 15b is arranged along the cotter portions 11 on the two sides of the precast floor board 10 that face each other. At that time, the precast floor board 10
In correspondence with the positions of the holes 12 provided in the girders 15b, which are pre-fixed on the beam 15b, are inserted into the holes 12 relative to each other. The gibber streak 16 is positioned in each hole 12 of the cotter portion 11 by inserting and fixing it to the beam 15b.

After that, non-shrink mortar is placed in each hole 12 of the cotter portion 11 in which the gibber streak 16 fixed to the beam is placed, whereby the precast floor board 10 and the beam 15b are integrated. To be The precast floorboard 20 with a beam having such a structure and the precast floorboard 10 described above are transported from the factory to the construction site, and as shown in FIG. Attach the cotters on both ends that are not attached to the girder 15
Place one on top of the other on the scheduled precast floorboard placement position on top of a.

Then, the small beam 15b and the large beam 15a are welded or connected to each other by using a high tension bolt or the like by a well-known means, and then the precast floor plate 10 without the beam is positioned between the precast floor plates 20 with the small beam. Each cotter section 11
Is installed on the large beam 15a and the small beam 15b of the precast 20 with the small beam so that the cotter portions 11 of the adjacent precast floor plates are engaged with each other.

At this time, the gibber streak 16 is pre-fixed on the girder 15a corresponding to the position of the hole 12 provided in the cotter portion 11 of the precast floorboard 10 and the precast floorboard 20 with the beam, so that the cotter portion 11 is Insert into each hole 12 relative to each other, or each precast floorboard 1
After installing 0 and 20 on the girder 15a, the cotter part 11
Girber 16 is inserted from each hole 12 of
The gibber streak 16 fixed to the girder 15a is arranged in each hole 12 of the cotter portion 11 by any method of fixing to the a.

Thereafter, non-shrinkage mortar is cast into the gaps between the cotter portions of the adjacent precast floorboards and the holes 12 of the cotter portion 11 on the girder 15a. In this way, the precast floorboard is placed on the steel beam and integrated.

In the embodiment shown in FIG. 1, the shape of the corner portion of each precast floorboard 10 is formed so as to be completely in close contact with the corner portions of other adjacent precast floorboards 10. Using the precast floorboard 30 as shown in FIG. 8, the space portion 3 is provided on the steel beam where the corners of the four precast floorboards gather.
1 (shown with a shaded line for convenience) may be formed.

In this case, also in this space 31, the gibber streak 16 made of stud bolts or the like is fixed to the steel beam 15 by welding or the like, and then the space 31 is filled with non-shrink mortar. By doing so, the respective corner portions of the precast floorboards 30 are also improved in the integration with the steel beam, and the strength of the slab as a whole can be further increased.

[0026]

EXAMPLES As a concrete example of the precast floorboard according to the present invention, the precast floorboard 10 having the cotter portions 11 formed on the four sides can be made of reinforced concrete. At that time, a hole 12 for inserting a dowel provided in the cotter portion 11
Two are formed on each convex portion 11a.

The protrusion length of the protrusion 11a in the cotter portion 11 of the precast floor board 10 having a thickness of 150 mm which is usually used is about 200 mm. And the cotter part 1
The hole 12 formed in No. 1 has a trapezoidal cross section in which the upper opening diameter is slightly larger than the lower opening diameter. Also, this hole 12
The concrete covering dimension from the upper and lower ends of the reinforcing bar 13 arranged so as to surround the circumference of the to the surface of the precast floorboard is about 10 mm.

It is very preferable that the reinforcing bar 13 is a spirally formed one if it is easily available and inexpensive. However, a large number of rings are stacked at intervals and connected by a thin bar. It may be something like this.

The stud bolt, which is most applicable as the gibber streak 16, is fixed to the large beam 15a or the small beam 15b by means such as welding. Then, as a method of forming a hole for inserting a gibber streak in the cotter convex portion of the precast floor plate, a cylindrical form frame / reinforcing plate 19 made of a thin iron plate and a spiral reinforcing bar to be arranged around its outer periphery are introduced. It is also fixed by welding.

[0030]

As described above, according to the precast floorboard of the present invention, it is possible to efficiently construct a slab, that is, a floor having a very high strength in a steel building in an extremely short period of time, and as a result, Construction materials can be temporarily placed at any time, in other words, a floor that can be used as a material stockyard can be formed early,
Lifting weight can be reduced by preceding lifting such as finishing materials to minimize lifting equipment, and there is no need to install a temporary gantry to put work materials separately as in the past.
This temporary gantry is very economical because it does not cost.

Further, according to the precast floorboard of the present invention, since the floor construction can be completed in a steel frame building at an early stage, it becomes a roof and the subsequent work is not affected by the weather, and the passage and the working space are early. As a result, the working environment is improved, and it is possible to smoothly shift to the finishing work after the steel frame is built.

[Brief description of drawings]

FIG. 1 is a plan view partially showing a slab configured by disposing a precast floor board according to an embodiment of the present invention on a steel beam.

FIG. 2 is a structural explanatory view showing a partially enlarged cotter portion of the precast floor board arranged on a steel beam.

FIG. 3 is a cross-sectional view of a cotter portion in the precast floor board shown by cutting along the line 3-3 in FIG.

FIG. 4 is a perspective view showing a cylindrical formwork / reinforcing plate made of a thin iron plate used in a method of forming a hole for inserting a dowel reinforcement in a convex part of a cotter part of a precast floor plate and a reinforcing bar attached to the outer periphery thereof. is there.

5 is a partially enlarged plan view of a precast floor board joint portion in the slab shown in FIG. 1. FIG.

FIG. 6 is a structural explanatory view schematically showing a precast floorboard with crossbeams used in a precast floorboard joint structure according to another embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a method for constructing a precast floor board joint structure according to another embodiment of the present invention.

FIG. 8 is a plan view partially showing a slab configured by disposing a precast floorboard according to another embodiment of the present invention on a steel beam.

[Explanation of symbols]

 10 Precast Floor Board 11 Cotter Part 11a Convex Part 11b Recess 12 Hole for Gibel Reinforcement 13 Reinforcing Bar 14 Slab Reinforcement 14a U-Shaped Reinforcing Bar 15 Steel Beam 15a Large Beam 15b Small Beam 16 Gibel Rein 17 Gap 18 Non-shrink Mortar 19 Gibel Rein Formwork and reinforcing plate for forming insertion holes 20 Precast floorboard with beam

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Satoshi Tsuda 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd.

Claims (3)

[Claims] 1. A cotter portion which is formed on four sides and which is composed of a convex portion and a concave portion, at least one hole for inserting a gibber line formed in each convex portion of each of the cotter portions, and arranged around the hole. A reinforcing bar and at least a slab bar having a U-shaped bar arranged so as to surround the hole, and the U-shaped bar of the slab bar is arranged on the reinforcing bar. Precast floorboards characterized by being streaked. 2. A precast floorboard which is formed on four sides and has a cotter portion composed of a convex portion and a concave portion, wherein at least one hole for inserting a gibber line formed in each convex portion of each of the cotter portions, Reinforcing bars arranged around the hole and U arranged so as to surround the hole.
U of the slab reinforcement, which includes a reinforcing bar portion having at least a slab reinforcement having a type reinforcing bar portion, and a beam attached in advance to the precast floor board so that a pair of opposing cotter portions are relatively mounted. A type rebar part is reinforced with the reinforcing bar, and the girder bar with the beam and the precast floor plate fixed to the beam is positioned in the hole of the cotter part, and non-shrink mortar is struck in the hole. A precast floorboard that is integrated by installing it. 3. The hole for inserting the gibber reinforcement formed in the convex portion of the cotter portion is formed by forming a thin iron plate into a cylindrical shape to serve as a form and reinforcement plate, and the reinforcement reinforcement is wound around the outer periphery and fixed. Then, by placing this at a predetermined position between the surface molds for the precast floorboard and hardening the concrete filled in the space surrounded by these surface molds and other side molds, the surface molds and the side surfaces. The precast floorboard according to claim 1 or 2, wherein the mold is released from the mold, but the mold-cum-reinforcing plate used to form the hole is formed by being buried as it is.