JP2006118339A - Slab for forming floor slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slab used for constructing a floor slab, reducing labor required for its installation. <P>SOLUTION: The slab 12 for forming the floor slab comprises a PC plate 16 forming a part of the floor slab 10, and a plurality of blocks 18 substantially forming voids in the floor slab. The PC plate comprises a plate-like body 20 presenting rectangular shape as a whole, a single or a plurality of projection parts 22 projecting upward from the body and extending at the center between a pair of edge parts, parallel with the edge parts, and a plurality of reinforcements 24 embedded along the respective edge parts of the body and extending upward. The blocks 18 are arranged between the projection parts 22 and reinforcements 24 of the PC plate or further between the projection parts, along the projection parts at spaces from one another. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plate used to form a floor slab of a building, and more particularly to a plate-like member that is installed to form a so-called void floor slab of an apartment house and forms a part of the floor slab.

  Conventionally, as such a plate for forming a floor slab, in order to reduce its weight, increase its bending strength, etc., a plurality of parallel protrusions projecting upward from a plate-like main body constituting the plate are provided. A precast concrete board (hereinafter simply referred to as “PC board”) is used. The space between the protruding portions of the PC plate is filled with a filler such as foamed plastic when the floor slab is constructed so as to form a substantial void in the floor slab (see Patent Document 1).

Japanese Patent Laid-Open No. 3-132547

  The floor slab is formed by placing a plurality of plates side by side on a pair of previously constructed beams and placing concrete on them. In the floor slab, the filler forms a portion different from the PC board and the cast concrete, that is, a substantial void.

  By the way, in the construction of the floor slab using the plate, for the interconnection between the plate and the concrete layer made of the cast concrete and the interconnection between the plates, reinforcing bars are embedded in the cast concrete. Is done.

  In the conventional plate, for the interconnection between the plate and the concrete layer which is a solidified concrete placed thereabove, a plurality of reinforcing bars are protruded from each other so that their upper ends are exposed. It is buried in the strip. However, the concrete used at the time of shaping | molding the said protrusion part often adheres to the upper end part of these reinforcing bars. For this reason, prior to the placement of the concrete during the construction of the floor slab, there is a problem that an operation for peeling off the concrete adhering to the upper end portion of the reinforcing bar is involved, which requires a lot of time and labor.

  Further, in the conventional plate, since a plurality of ridges are arranged on the main body and close to the edge of the main body, it is sufficient between the ridges of the two adjacent plates arranged side by side. For this reason, a reinforcing bar having a bent portion is used instead of a linear reinforcing bar as a reinforcing bar for mutual connection between the two plates. However, there is a problem that a reinforcing bar having such a bent portion requires a lot of labor and time for its installation.

  Therefore, the present invention contemplates providing a plate that is used for construction of a floor slab and that reduces the labor required for the installation.

The present invention is a plate for forming a floor slab comprising a PC plate for forming a part of the floor slab and a plurality of blocks for substantially forming voids in the floor slab,
The PC plate is a plate-like main body that has a rectangular shape as a whole, and one protrusion protruding upward from the main body, and extends in parallel with the center between a pair of opposing edges of the main body. And a plurality of reinforcing bars implanted along each edge of the main body and extending upward, and the block is between the protruding part of the PC plate and the reinforcing bar. And are spaced apart from each other.

  In another invention relating to the half for forming a floor slab, instead of the one ridge portion, the slab includes a plurality of ridge portions spaced from each other, and the block further includes a portion between the ridge portions. Is arranged.

  The plate is preferably pre-stressed by a plurality of PC steels disposed within the body of the PC plate and extending parallel to the edges of the body. About the said PC steel material, the PC steel material arrange | positioned under the protrusion part of the said main body shall have a larger diameter than another PC steel material. Preferably, the block has an uneven top surface.

  According to the present invention, on the plate-like main body of the PC plate in the floor slab forming plate, a plurality of ridges that are single or spaced apart from each other are provided at the center between the opposing edges. Therefore, when arranging a plurality of plates side by side in forming the floor slab, a relatively long space can be obtained between the protruding portions of the two adjacent plates, and here, as a reinforcing bar for connecting the two plates It is possible to arrange a connecting reinforcing bar having a relatively simple shape such as a linear reinforcing bar. For this reason, it is possible to reduce labor and time required for installing the connecting reinforcing bars.

  Further, in the present invention, the reinforcing bars for connecting the plate and the concrete layer placed on the plate are not along the thick protrusions but along the edge of the thin main body. Since it is implanted, the amount of exposure of the reinforcing bars is larger than that of the conventional case, and the concrete used for forming the plate is less likely to adhere to the reinforcing bars. Moreover, even if it adheres, it is possible to ensure a sufficient adhesion surface for the cast concrete placed on the plate. For this reason, the peeling operation | work of the concrete which may adhere to the said reinforcing bar can be reduced or abbreviate | omitted.

  The plate can be prestressed by the PC steel material embedded in the plate, and in particular, the PC steel material disposed under the ridge is thicker, so that a larger prestress can be introduced through this. is there. When adopting a block whose top surface is uneven, the floor slab is superior in sound-blocking property against sound generated on the floor slab, that is, sound-insulating property, compared to a block having a flat top surface. It can be.

  Referring to FIG. 1, a floor slab of a building such as an apartment house is indicated by a reference numeral 10 as a whole, and a plurality of plates for forming a floor slab according to the present invention forming a part of the floor slab 10 are respectively shown in FIG. In FIG.

  When the floor slab 10 is constructed, a plurality of plates 12 are laid over a pair of previously constructed beams (not shown), and concrete 14 is placed thereon. Below the plate 10, one or a plurality of supporters (not shown) for supporting the plate 10 are installed. The concrete layer formed by solidifying the cast concrete 14 defines the floor of the building.

  As shown in FIGS. 1 to 3, the plate 12 includes a precast concrete board (PC board) 16 and a plurality of blocks 18 arranged on the PC board.

  The PC plate 16 has a plate-like main body 20 that has a rectangular shape as a whole (that is, has a rectangular planar shape), a single ridge 22 that is connected to the main body 20 and protrudes upward from the main body, and a plurality of ridges. The reinforcing bars (in the illustrated example, so-called truss bars extending in an inverted V shape upward) are provided.

  The main body 20 of the PC plate 16 has a pair of opposed parallel edges 26 and another pair of parallel edges 28 perpendicular to the edges 26. In the illustrated example, one edge 26 is longer than the other edge 28, but both edges 26, 28 can be set to the same length.

  The protruding portion 22 of the PC plate 20 extends in the center between both edge portions 26 of the main body 20 in parallel with both edge portions 26. In the example shown in the drawing, both ends of the ridge 22 end at the other both edges 28 of the main body 20, but at least one of the both ends may end before reaching the edge 28. . Moreover, although the protrusion part 22 of illustration has a rectangular cross-sectional shape, it can have another cross-sectional shape, for example, trapezoid shape. In addition, the ratio of the width dimension of the protrusion part 22 with respect to the width dimension (length dimension between the both edge parts 26) of the main body 20, and the height dimension of the protrusion part 22 can be defined arbitrarily.

  By providing the protrusions 22, it is possible to suppress an increase in the weight of the plate 12 and increase the bending strength of the plate 12 as compared with the case where the thickness of the entire main body 20 is set to be large. As a result, the bending of the plate 12 accompanying the placement of the concrete 14 can be reduced. For this reason, the amount of the supporting work required for supporting the plate 12 can be reduced, and the accompanying supporting work can be installed. The labor and cost required can be reduced, and the work space under the plate 12 can be expanded.

  In addition, since one protrusion 22 is provided at the center of the main body 20, the protrusion 22 and each edge 26 are compared with the conventional structure in which a plurality of protrusions are provided in parallel at equal intervals over the entire surface of the main body. The distance a (FIG. 3) can be made larger.

  By making it possible to set a relatively large distance a between the ridge 22 and each edge 26, when the plurality of plates 12 are arranged side by side when the floor slab 10 is formed, the plates 12 adjacent to each other are arranged. As connection reinforcing bars embedded in the concrete 14 to be connected to each other, it is possible to use a relatively long rod-shaped reinforcing bar 30 which is a simple form, a reinforcing bar (not shown) whose ends are bent, or the like. is there. This is a significant reduction in labor and time required for installation as compared to the case where a reinforcing bar bent into a complicated shape is used to obtain a larger surface area in order to ensure that the distance a is relatively short. Contribute to.

  The plurality of reinforcing bars 24 are implanted along each edge 26 of the main body 20 so as to be aligned on a line parallel thereto, and extend upward. These reinforcing bars 24 are embedded in the concrete 14 and connect the plate 12 and the concrete 14 layer when the concrete 14 is placed on the plate 12 to form the floor slab 10. The plurality of reinforcing bars 24 can be arranged in a non-linear manner, for example, in a zigzag manner, instead of the illustrated example.

  Since the two reinforcing bars 24 extending along the two edge portions 26 are implanted in the main body 20 which is thinner than the protruding portion 22 of the plate 12, the reinforcing rod 24 is inserted into the protruding portion 22 as in the conventional case. The amount of exposure can be increased as compared with the case of implantation in a plant. In addition, when concrete is poured into the formwork when the plate 12 is manufactured, the concrete is less likely to adhere to the exposed portions of the reinforcing bars 24 than in the case where the reinforcing bars 24 are implanted into the protrusions. For this reason, it is possible to reduce the labor and time required for the work of peeling the adhered concrete from the reinforcing bars 24 prior to placing the concrete 14.

  The plurality of blocks 18 are disposed along the ridges 22 and spaced from each other between the ridges 22 of the PC plate 20 and the reinforcing bars 24 of each strip. The block 18 is fixed to the surface of the PC plate 16 by hitting the block 18 with a nail (not shown), for example. As a result, the plate 12 can be easily transported, and the floating of the block 18 when the concrete 14 is buried in the concrete 14 can be suppressed.

  In the illustrated example, the plurality of blocks 18 are arranged in a row in contact with each side surface of the protrusion 22. The size of the block 18 can be arbitrarily determined. Moreover, the block 18 can also be arrange | positioned away from the protrusion part 22. FIG.

  The block 18 is made of a material different from the concrete 14, for example, a foamed plastic such as urethane foam, and is lighter than the concrete 14. For this reason, the block 18 forms a portion substantially equivalent to a void in the floor slab 10, that is, a portion that substantially forms a void, thereby reducing the weight of the floor slab 10.

  The block 18 has an uneven top surface 32. The top surface 32 having an uneven shape is more excellent in blocking the sound generated on the floor slab 10 than the top surface defined by one flat surface.

  In the example shown in the drawing, the block 18 has a rectangular planar shape extending in one direction as a whole, two end surfaces 34 and two side surfaces 36 connected to the top surface 32, and a rectangular bottom surface facing the top surface 32. 38 (see FIG. 3). Further, due to the arrangement of these blocks 18, an elongated space 40 partitioned by the blocks 18 is formed above the PC board 16.

  The block 18 has a plurality of curved portions connected to each other, that is, two curved portions forming a mountain and one curved portion forming a valley between them when viewed in a cross section thereof (a cross section parallel to the end face 34). Unevenness is defined. The unevenness may be defined by unevenness of other shapes, for example, a plurality of straight portions that are continuous and bent. In the illustrated example, the irregularities are straight lines as viewed in a vertical cross section perpendicular to the horizontal cross section, but they may be composed of a plurality of curved portions or straight line portions that are further connected to each other.

  However, the block 18 may have an arbitrary shape, for example, a rectangular parallelepiped shape, instead of the illustrated example.

  When the concrete 14 is cast and the floor slab 10 is formed, the main body 20 of the PC board 16 and the plate-like solidified material of the concrete 14 filling the inter-block space 40 thereabove are integrated with each other, and The protruding portion 22 of the PC plate 16 and the plate-like solidified material of the concrete 14 thereabove are integrated with each other. As a result, in the floor slab 10, the solidified material of the concrete 14 filling the space 20 connected to a part of the main body 20 and the solidified material of the ridge 22 and the concrete 14 covering this form a lattice shape and are reinforced. Acts as a rib.

  The PC plate 16 of the plate 12 can be prestressed therein.

  In the illustrated example, a plurality of PC steel materials 42 and 44 that apply the prestress are disposed in the PC plate 16. The PC steel materials 42 and 44 extend parallel to the edge portion 26 of the main body 16 (FIG. 1). The PC steel material 42 located below the ridge 22 has a larger diameter than the PC steel 44 located at the other location because the ridge 22 has a larger thickness than the other location. This can introduce a greater prestress under the ridge 22.

  In addition, the code | symbol 46,48,50 shown in FIG. 1 shows the reinforcement reinforcing bar arrange | positioned in the floor slab 10, and the code | symbol 52 extends | stretches along each edge part 26, and the several truss bars 24 are each in these top parts. Indicates the reinforcing bar to be connected.

  Since the plate 12 can be produced at the factory, a plate with high dimensional accuracy can be obtained. Moreover, since the increase in weight of the plate 12 is smaller than that obtained by increasing the thickness of the PC plate 16, the plate 12 can be transported to the construction site relatively easily.

  Next, FIG. 4 shows a plate 12 according to another example.

  The plate 12 shown in FIG. 4 is different from the plate 12 shown in FIGS. 1 to 3 in that two protrusions 22 spaced apart from each other are arranged in the center of the main body 20, and the block 32 further includes both protrusions. It is additionally arranged between the strips 22a. Except for these two points, the plate 12 shown in FIG. 4 is the same as the plate 12 shown in FIGS. Therefore, in order to avoid duplication of explanation, the same reference numerals as those in FIGS. 1 to 3 are assigned to the same parts in FIG.

  Here, each protrusion 22 shown in FIG. 4 has a smaller width dimension than the single protrusion 22 of the plate 12 shown in FIGS. By making each protrusion 22 have a relatively narrow width, it is possible to minimize the increase in weight while ensuring the required rigidity for the entire plate. In addition, a relatively large distance a can be secured between each protrusion 22 and each edge 26 of the main body, as shown in FIGS. 1 to 3, and a bar-shaped reinforcing bar 30 is disposed at this location. can do.

  The block 18 arranged between the two ridges 22 can be arranged so that both end faces 36 thereof are in contact with the two ridges 22 or not in contact with the two ridges 22.

  The number of the ridges 22 arranged in the center of the main body 20 can be set to 3 or more instead of the illustrated example described above. In this case, a distance a can be ensured between the ridge portion located on the outermost side of these ridge portions and closest to the edge portion of the main body 20 and the edge portion 26 of the main body 20. The width dimension of the main body 20 can be set larger, including the case where the two protrusions 22 are provided. Moreover, in this case, the width of each protrusion can be made thinner.

1 is a partial cross-sectional view of a floor slab including a floor slab forming plate according to the present invention. It is a top view of the plate for floor slab formation. It is a side view of the plate for floor slab formation. It is a cross-sectional view of a plate for forming a floor slab according to another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Floor slab 12 Floor slab formation plate 14 Casting concrete or its solidified material 16 Precast concrete board 18 Block 20 Main body 22 Projection part 24 Reinforcement (truss)
26, 28 Edge 30 Reinforcing bars 42, 44 PC steel

Claims (5)

A floor slab forming plate comprising a PC plate for forming a part of a floor slab and a plurality of blocks for substantially forming voids in the floor slab,
The PC plate is a plate-like main body that has a rectangular shape as a whole, and one protrusion protruding upward from the main body, and extends in parallel with the center between a pair of opposing edges of the main body. One ridge,
A plurality of rebars implanted along each edge of the main body and extending upward;
A floor slab forming plate, wherein the block is disposed between the ridge portion of the PC plate and the reinforcing bar along the ridge portion and spaced from each other. A floor slab forming plate comprising a PC plate for forming a part of a floor slab and a plurality of blocks for substantially forming voids in the floor slab,
The PC plate is a plate-shaped main body having a rectangular shape as a whole, and a plurality of spaced-apart protruding ridges protruding upward from the main body, and a center between a pair of opposing edges of the main body A plurality of ridges extending parallel to these, and
A plurality of rebars implanted along each edge of the main body and extending upward;
A floor slab forming plate in which the block is disposed between the ridges of the PC plate and the reinforcing bars and between the ridges, along the ridges and at intervals.   The floor slab construction plate according to claim 1 or 2, wherein prestress is introduced by a plurality of PC steel materials disposed in the main body of the PC plate and extending in parallel with an edge portion of the main body.   The floor slab forming plate according to claim 3, wherein the PC steel material disposed under the protruding portion of the main body has a larger diameter than other PC steel materials.   The floor slab forming plate according to claim 1, wherein the block has an uneven top surface.

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