JPS646009B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to reduce the overall weight as much as possible while having the necessary structure (thickness) to maintain the necessary deflection strength and sound insulation (mainly sound insulation) performance as a building floorboard. It is a manufacturing method of lightweight material-containing floorboards, which is constructed by embedding lightweight materials such as expanded polystyrene within the wall thickness of the floorboards. In order to improve quality and eliminate the complexity and unproductiveness of the overall work due to the convergence of reinforcement work and concrete pouring work, it can be manufactured mainly by one time concrete pouring in a factory. The present invention relates to a method of manufacturing a precast floor board containing lightweight materials.

Although the above manufacturing method is very effective in terms of quality and productivity as mentioned above, it is easy to create cavities and cavities due to insufficient penetration of the poured concrete to the bottom of the lightweight material. In addition, when concrete is placed, lightweight materials may lift or move horizontally, and this lifting of lightweight materials can cause the upper layer lattice reinforcing bars to also be pushed up, resulting in a reduction in bar placement accuracy. There is.

In view of the above circumstances, the present invention has been developed to maintain the position of lightweight materials with an extremely simple configuration and process addition, without impairing the quality and production advantages of single-time concrete pouring. The purpose of this paper is to propose a method that can improve bar placement accuracy.

The method for manufacturing a precast floor board containing lightweight materials according to the present invention involves forming lower layer lattice reinforcing bars and upper layer lattice reinforcing bars connected to each other via beam reinforcements in a formwork positioned horizontally or nearly horizontally with its upper surface open. In addition to arranging the reinforcing bars and the lightweight material to be buried between the upper and lower lattice-shaped reinforcing bars, a plate-like member that comes into contact with the lower surface of the lightweight material to receive and support it, and a plate-like member that extends downwardly from this plate-like member are integrated. A spacer consisting of a plurality of rod-shaped members that are extended and whose intermediate portions are fixedly connected to the lower lattice reinforcing bars is arranged, and the spacer is arranged in the formwork to prevent floating of the lightweight material during concrete pouring. A presser frame for preventing horizontal movement is fixed, and concrete is poured into the formwork with a pipe for confirming concrete filling, which also serves as air bleed, penetrated and held in the lightweight material. shall be.

In other words, the lattice reinforcing bars of the upper and lower layers to be buried in the floorboards, the beam bars connecting the two, and the lightweight materials to achieve the weight reduction of the floorboards are all pre-assembled and arranged in the formwork. Since it is manufactured by pouring concrete only once, the concrete is manufactured in one time, compared to the case where the reinforcing and concrete pouring for the upper and lower layers are divided, that is, carried out twice at the same time. Not only is it possible to obtain floorboards with superior strength and quality because there is no cold joint caused by joints, but it is also possible to introduce a mass production method in factories, which improves productivity. In addition, the above-mentioned pipe is held through the lightweight material arranged in the formwork, and the lightweight material consisting of a plate-like member and a plurality of rod-like members and reinforcing bars are placed under the lightweight material. Since the spacer also serves as a support for the group, and a holding frame is provided at the top, the air inside the formwork at the bottom of the lightweight material can be smoothly discharged during concrete pouring, making it easier for concrete to move around. As a result, defects such as nests and cavities do not occur under the lightweight materials, and horizontal movement, lifting, and sinking of the lightweight materials and reinforcing bars that occur during concrete pouring, as well as changes in the distance between the two, are ensured. This made it possible to secure the buried position of lightweight materials and improve reinforcement accuracy.

Hereinafter, embodiments of the method of the present invention will be listed in order of steps based on illustrative drawings.

As shown in FIG. 1, a surface plate 1 has table vibrator mounting frames 10 attached at multiple locations around it, and its upper surface is positioned horizontally or almost horizontally.
A and a peripheral formwork 1B erected and fixed around the entire periphery of this surface plate 1A are assembled to form a formwork 1 with an open top surface.

As shown in FIG. 2, upper layer reinforcing bars 4 and lower layer reinforcing bars 3 are assembled in a vertical and horizontal lattice in the formwork 1.
are set in a substantially inverted V shape and strongly connected to each other via corrugated beam reinforcements 2 to have a predetermined covering thickness, and in the space formed between the reinforcement bars 4 and 3 of the upper and lower layers A lightweight material 5 such as styrofoam is arranged, and the reinforcing bars 4, 3, 2 and the lightweight material 5 are brought into contact with the lower surface of the lightweight material 5 as shown in FIG. 6 to receive and support the plate. Planar member 6a and this plate-like member 6a
A spacer 6 that also serves as a lightweight material receiver, consisting of a group of rod-shaped members 6b, such as a plurality of reinforcing bars extending downward from the
Using a plurality of rod-like members 6b, the intermediate portions of the group of rod-shaped members 6b are fixedly connected to the lower reinforcing steel 3 by welding means or binding means such as wires, and are fixed in position.

Next, as shown in FIG. 3 A and B, the above-mentioned metering material is placed on the lower surface of the formwork 1 at the open upper surface of the formwork 1 in order to prevent the lightweight material 5 from floating up and moving horizontally during concrete pouring. A plurality of square pipe holding frames 7 with claws that come into contact with the upper surface of the material 5 are arranged parallel to each other in a parallel or almost parallel posture, and both ends of these holding frames 7 are fixed to the formwork 1, and each of the lightweight Pipe 8 for confirming concrete filling, which also serves as air release material such as PVC pipe for material 5
Penetrate and hold.

From this state, as shown in FIG. 4, concrete 9 is poured into the formwork 1 via the hopper 11. At this time, the table vibrator 12 attached to the pedestal 10 is activated to apply vibration to the formwork 1, thereby causing the concrete 9 to be placed.
By improving the fluidity of the material so that it can sufficiently flow around the lower part of the lightweight material 5, and by discharging the air in the formwork 1 below the lightweight material 5 through the pipe 8, the generation of nests and cavities is prevented. At the same time, it is visually confirmed whether the concrete 9 is sufficiently filled to the lower part of the lightweight material 5 through the pipe 8.

After that, as shown in FIG. 5, the pipe 8,
The holding frame 7 and the vibrator 12 are removed, the surface is finished with mortar or the like, and after curing and hardening for an appropriate period, the mold is removed.

The precast floorboards refined through the above process are light compared to the slab construction (thickness) because the lightweight material 5 is enclosed, and there is no cold joint due to concrete pouring, so there is no nesting. There are no cavities, and the position of the lightweight material and the precision of the bar placement are excellent, resulting in a floorboard of excellent quality.

The above-mentioned beam reinforcement 2 may be an inverted V-shape as in the above embodiment, or a rectangular stirrup reinforcement.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the method for manufacturing a precast floor board containing lightweight materials according to the present invention, and FIGS. 1 to 5 are explanatory diagrams of each process, and FIGS. 6A and 6B are enlarged vertical cross-sectional views of a spacer. FIG. 1... Formwork, 2... Beam reinforcement, 3... Lower layer reinforcing bar, 4
...Upper layer reinforcing bar, 5...Lightweight material, 6...Spacer, 6a...Plate member, 6b...Bar member, 7
...Press frame, 8...Pipe, 9...Concrete.

Claims (1)

[Scope of Claims] 1. Lower layer lattice reinforcing bars 3 and upper layer lattice reinforcing bars 4, which are connected to each other via beam reinforcements 2, in a formwork 1 which is positioned horizontally or almost horizontally with its upper surface open. A lightweight material 5 is placed between the upper and lower lattice-shaped reinforcing bars 4, 3, and a plate-like member 6a contacts the lower surface of the lightweight material 5 to receive and support it. 6a, and the middle part thereof is connected to the lower layer grid reinforcing bars 3.
A spacer 6 consisting of a plurality of rod-shaped members 6b fixedly connected to the formwork 1 is disposed, and
A holding frame 7 is fixed to prevent floating and horizontal movement of the lightweight material 5 during concrete pouring, and a pipe 8 for confirming concrete filling, which also serves as an air vent, is penetrated and held in the lightweight material 5. A method for producing a precast floor board containing lightweight materials, characterized in that concrete 9 is poured into the formwork 1 in a state where the concrete is placed in the formwork 1. 2. The method for manufacturing a precast floorboard containing lightweight material according to claim 1, wherein the lightweight material 5 is styrofoam. 3. The method for manufacturing a precast floor board containing lightweight materials according to claim 1 or 2, wherein vibration is applied to the formwork 1 during concrete pouring.