JP7560380B2 - Deck plate and deck construction method - Google Patents

Description

The present invention relates to deck plates and deck construction methods.

Deck plates have been proposed for use in constructing floor slabs and ceiling slabs in building structures (see, for example, Patent Document 1). The deck plate described in Patent Document 1 has a flat flange and multiple ribs protruding from the flange, and the strength of the deck plate is improved by the ribs formed integrally with the flange.

JP 2019-138138 A

In deck plates such as those described in Patent Document 1, the ribs are crushed at both longitudinal ends to form end-closed sections, allowing both ends of the deck plate to be placed on top of the beams. When concrete is poured onto such a deck plate, the deck plate serves as a formwork for the underside of the concrete. In this case, concrete stops must be installed at the ends of the floor slabs, etc., as formwork for the sides, and reinforcement against the lateral pressure of the concrete is also required, so there is a demand for labor-saving construction work.

The present invention was made in consideration of the above-mentioned problems, and its purpose is to provide a deck plate and deck construction method that can reduce the labor required for construction work.

In order to achieve the above object, the deck plate of the present invention is a deck plate used in the formwork of a reinforced concrete structure, and is characterized in that it comprises a rectangular flange portion, a number of ribs protruding from one side of the flange portion, and an end-closed portion at the longitudinal end of the flange portion where the ribs are crushed, and that the end-closed portion at at least one longitudinal end is bent with a cross plate portion that extends toward the other side so as to cross the flange portion.

In one aspect of the deck plate of the present invention, the cross plate portion extends perpendicular to the flange portion.

On the other hand, the deck construction method according to the present invention is a deck construction method using the above-mentioned deck plate, characterized in that the cross plate portion is used as a concrete stopper.

The deck plate and deck construction method of the present invention can reduce the labor required for construction work.

FIG. 1 is a perspective view showing a deck plate according to an embodiment of the present invention. 1 is a perspective view showing a state during a manufacturing process of a deck plate according to an embodiment of the present invention. FIG.

The following describes an embodiment of the present invention with reference to the drawings.

Figure 1 is a perspective view showing a deck plate 1 according to an embodiment of the present invention, and Figure 2 is a perspective view showing the deck plate 1 during the manufacturing process.

As shown in FIG. 1, the deck plate 1 according to the embodiment of the present invention is a deck plate used as a formwork for reinforced concrete structural parts (such as floor slabs and ceiling slabs), and comprises a rectangular flange portion 2, a number of ribs 3 protruding from one surface 2A of the flange portion 2, and an end-closed portion 4 in which the ribs 3 are crushed at the longitudinal end of the flange portion 2, and the end-closed portion 4 at at least one longitudinal end is bent with a cross plate portion 43 that extends toward the other surface 2B so as to intersect with the flange portion 2. The deck plate 1 will be described in detail below.

In the following, the long side direction of the rectangular plate-shaped flange portion 2 is the X direction, the short side direction is the Y direction, and the direction perpendicular to the plate is the Z direction. Also, the lower side in Figure 1 is one side in the Z direction, and the upper side is the other side.

The deck plate 1 is, for example, a flat deck, and is formed entirely from a single thin steel plate. The surface of the deck plate 1 may be appropriately treated with corrosion resistance, such as hot-dip galvanizing.

The flange portion 2 is composed of multiple plate portions 20. The plate portions 20 are formed in a rectangular plate shape with the long side direction being in the X direction, and the multiple plate portions 20 are lined up in the Y direction. The multiple plate portions 20 are formed integrally with each other via the ribs 3. The surface of the flange portion 2 on which the ribs 3 are provided (one side in the Z direction) is called one side 2A, and the opposite side (the other side in the Z direction) is called the other side 2B. The other side 2B may be embossed or ridged to improve rigidity.

The flange portion 2 may have a locking portion formed on one edge in the Y direction that is bent toward the one surface 2A side. The locking portion is a portion formed to connect multiple deck plates, and it is sufficient that the locking portion on one deck plate is inserted into a receiving portion on another deck plate adjacent to it in the Y direction.

The rib 3 protrudes from one surface 2A of the flange portion 2, and is formed in a triangular cross section whose Y-direction dimension increases from its base end toward its tip end (i.e., as it moves away from the surface 2A). That is, the base end of the rib 3 is located at the apex of the triangle in cross section, and the tip end is located at the base. Although only one rib 3 is visible in FIG. 1, a rib 3 is provided between each of the three plate portions 20, and a rib 3 is also provided on the right edge of the plate portion 20 located on the far right side (nearest side) in FIG. 1, meaning that a total of three ribs 3 are provided. The rib 3 provided between the plate portions 20 connects the plate portions 20 on both sides in the Y direction by being formed integrally with each of the plate portions 20 located on both sides.

As shown in Figure 2, the end closed section 4 is a section formed by flatly crushing the ribs 3 at both ends of the deck plate 1 in the X direction so that they are flush with the flanges 2. Note that Figure 2 shows the deck plate before the cross plate section 43, which will be described later, is formed. In the end closed section 4, the ribs 3 are crushed to fit along one surface 2A of the flanges 2. Furthermore, by forming the end closed section 4, both ends of the deck plate 1 in the X direction are closed, and the Z direction dimensions at both ends are reduced.

One of the end-closed sections 4 formed at both ends of the deck plate 1 in the X direction (the lower side in FIG. 1) is bent to form a flat section 41 located on the extension surface of the flange section 2, a bent section 42 bent at a right angle or approximately a right angle from the flat section 41 toward the other surface 2B, and a cross plate section 43 extending from the bent section 42 toward the other surface 2B. The cross plate section 43 extends along the YZ plane, that is, perpendicular to the flange section 2 along the XY plane. In the illustrated example, the detailed depiction of the surface of the cross plate section 43 facing outward (the surface corresponding to the one surface 2A) is omitted, and in reality, there are boundaries between the plate sections 20 and traces of crushed ribs 3.

Concrete is poured into the deck plate 1 as described above with the end closed portion 4 placed on the top surface of the flange portion of the beam. At this time, the flange portion 2 becomes the surface (plate portion) that mainly receives the load of the concrete. Furthermore, at one end in the X direction, the cross plate portion 43 becomes the surface (plate portion) that receives the lateral pressure of the concrete, so that the concrete does not flow out from the deck plate 1. In other words, the cross plate portion 43 functions as a concrete stopper. Therefore, in the deck construction method using the deck plate 1, there is no need to install a concrete stopper separate from the deck plate 1 in the area where the cross plate portion 43 is provided.

The cross plate portion 43 may have a portion for fixing to the beam (for example, a through hole through which a headed stud can pass), which can improve the fixing strength to the beam. The flange portion 20 and the cross plate portion 43, which are integrally formed steel plates, can surround the bottom surface and one end surface in the X direction of the slab, improving the strength and rigidity of the slab.

In the deck plate 1, the Z-direction dimension of the cross plate portion 43 may be set according to the slab thickness (e.g., to have a dimension approximately equal to or slightly larger than the slab thickness). The end-closed portion 4 has sufficient strength because the ribs 3 are crushed, and is not easily deformed by the lateral pressure of the concrete even when the slab thickness is large (e.g., 300 mm) (e.g., the displacement of the tip of the cross plate portion 43 is less than 1 mm, and the angle change of the bent portion 42 is easily less than 1°).

When pouring concrete, multiple deck plates are used in an area surrounded by multiple beams to form a floor slab, etc., and are laid out in the X and Y directions. Such multiple deck plates are called a deck plate set. It is sufficient that the deck plates located at the X-direction edge or the end of the floor slab, etc. of the entire deck plate set have cross plate portions 43 formed at the edge positions. Note that when only one deck plate is lined up in the X direction, it is preferable to provide cross plate portions 43 at both ends of this deck plate in the X direction.

In this way, according to the deck plate 1 of the embodiment of the present invention, the end closed portion 4 has a cross plate portion 43 that extends toward the other surface 2B so as to be perpendicular to the flange portion 2, allowing the cross plate portion 43 to function as a concrete stop, eliminating the need to install a separate concrete stop and reducing the labor required for construction work.

The present invention is not limited to the above embodiment, and includes other configurations that can achieve the object of the present invention, and the following modifications are also included in the present invention. For example, in the above embodiment of the present invention, the bent portion 42 is formed at a right angle or approximately a right angle, and the cross plate portion 43 extends perpendicular to the flange portion 2, but the cross plate portion may have a slight inclination relative to the direction perpendicular to the flange portion. If the bent portion or cross plate portion is likely to deform due to the lateral pressure of the concrete, the bent portion may be formed at an acute angle in advance depending on the amount of deformation.

Although the embodiment of the present invention has been described above, the present invention is not limited to the deck plate according to the above embodiment of the present invention, but includes all aspects included in the concept of the present invention and the scope of the claims. In addition, each configuration may be appropriately and selectively combined so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment may be appropriately changed depending on the specific usage mode of the present invention.

1...deck plate, 2...flange portion, 3...rib, 4...end closed portion, 43...cross plate portion

Claims (2)

A deck plate used in a formwork for a reinforced concrete structure,
A rectangular plate-shaped flange portion;
A plurality of ribs protruding from one surface side of the flange portion and extending along a longitudinal direction of the flange portion ;
and an end-closed portion in which the rib is crushed at an end portion in the longitudinal direction of the flange portion,
The end-closed portion at least at one end in the longitudinal direction is bent to form a cross plate portion that protrudes and extends from the other surface side of the flange portion so as to be perpendicular to the flange portion,
The cross plate portion is formed along the entire length of the short side of the end closed portion and has a height greater than or equal to the thickness of a concrete slab to be poured on the other side of the flange portion . A deck construction method using the deck plate according to claim 1 ,
A deck construction method characterized in that the cross plate portion is used as a concrete retainer.

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