Slab with opening and opening frame used for slab with opening

Abstract

To provide a slab with an opening and an opening frame used for the slab with an opening that can improve workability during construction while suppressing a decrease in strength at the opening.SOLUTION: A slab 1 with an opening is provided with a deck plate 2, concrete 5 poured on the deck plate 2, and an opening 3 penetrating the deck plate 2 and the concrete 5 in the thickness direction. The opening 3 has a square cylindrical opening frame 4 configured by connecting adjacent ends of a plurality of side wall panels 41 that form the inner surface of the opening 3. The plurality of side wall panels 41 extend from one surface to the other surface in the thickness direction of the slab 1 with an opening, and cut ends facing the opening 3 of the deck plate 2 are joined.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an apertured slab and an aperture frame used for an apertured slab, and more particularly to an apertured slab having an opening and an aperture frame used when forming an apertured slab. [Background technology]

[0002] Conventionally, in steel-framed reinforced concrete buildings, for example, a method using deck plates has been adopted to construct floors. In one such method, the deck plate cooperates with the concrete as a composite slab. In another method, the deck plate is used as a throw-away formwork. In either method, for example, multiple deck plates are placed on beams, and then concrete is poured on the deck plates to construct the slab.

[0003] In such slabs, openings are sometimes formed (see, for example, Patent Document 1). When an opening is formed in a slab, the portion of the deck plate corresponding to the opening is cut, resulting in a significant loss of strength. For this reason, in slabs with openings (hereinafter referred to as slabs with openings), multiple reinforcing bars, such as main reinforcement bars and diagonal reinforcement bars, are arranged around the opening to prevent cracks and the like around the opening.

[0004] To build a conventional slab with an opening, multiple reinforcing bars are installed around the opening, and concrete is poured after a concrete stopper plate is placed around the edge of the opening. After the concrete hardens, the reinforcing bars (top and bottom bars, etc.) exposed from the opening are cut off. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-85167 Summary of the Invention [Problem to be solved by the invention]

[0006] By the way, it generally takes more than a week for concrete to harden. Therefore, in order to build a conventional slab with an opening, workers must wait another day after pouring the concrete to cut the rebar exposed from the opening, which is inconvenient.

[0007] Therefore, it is conceivable to cut the portion of the deck plate that corresponds to the opening in advance and then pour concrete into it. This would eliminate the need to cut the rebar on a different day after pouring the concrete, and is expected to improve workability.

[0008] However, considering that the deck plate will be subjected to loads such as the weight of the concrete when it is poured, as well as the weight of workers and work equipment, it is necessary to install shoring to compensate for the loss of strength in the previously cut sections. However, installing shoring is time-consuming, and ultimately results in poor workability.

[0009] This invention has been made with attention to the above-mentioned problems, and aims to provide a slab with an opening and an opening frame for use in a slab with an opening, which can improve workability during construction while suppressing a decrease in strength at the opening. [Means for solving the problem]

[0010] The slab with an opening according to the present invention comprises a deck plate, concrete poured on the deck plate, and an opening penetrating the deck plate and the concrete in the thickness direction, the opening having a square cylindrical opening frame formed by connecting adjacent ends of a plurality of side wall panels which form the inner surface of the opening, the plurality of side wall panels extending from one side to the other side in the thickness direction of the slab with an opening, and at least a pair of opposing side wall panels among the plurality of side wall panels have protruding portions which protrude outward, and cut ends which face the opening in the deck plate are joined to the protruding portions. In the slab with opening according to the present invention, the inner peripheral surface of the opening is formed of a side wall plate extending from one side to the other side in the thickness direction of the slab with opening, so that the side wall plate functions as a flow stopper when pouring concrete, and the opening frame reduces cracks in the opening without installing multiple reinforcing bars around the opening. Moreover, since the cut end of the deck plate is joined to the opening frame, the cut part of the deck plate is connected via the opening frame, so that the reduction in the strength of the deck plate can be suppressed. Therefore, the part of the deck plate corresponding to the opening can be cut in advance and concrete can be poured without installing shoring. Therefore, the slab with opening according to the present invention can improve workability during construction while suppressing the reduction in strength in the opening.

[0011] The deck plate is preferably a reinforced deck plate having a base plate and reinforcing bars provided on the base plate, with cut ends of the reinforcing bars and base plate joined to two opposing side wall panels out of a plurality of side wall panels, and cut ends of the base plate joined to the other two side wall panels. In this embodiment, when a reinforcing steel deck plate is used as the deck plate, the cut ends of the reinforcing steel and the base plate are connected to the side wall plate, so that the strength of the reinforcing steel deck plate at the opening can be prevented from decreasing. Therefore, in a slab with an opening using a reinforcing steel deck plate, the workability during construction can be improved while preventing the strength from decreasing at the opening.

[0012] The deck plate is preferably a flat deck plate having a base plate embedded in concrete with cut edges of the base plate joined to a plurality of sidewall panels. In this embodiment, when a flat deck plate is used as the deck plate, the cut end of the base plate is connected to the side wall plate, so that the strength of the flat deck plate at the opening can be prevented from decreasing. Therefore, in a slab with an opening using a flat deck plate, the workability during construction can be improved while preventing the strength from decreasing at the opening.

[0013] The deck plate is preferably a composite deck plate having a base plate laid under the concrete with cut edges of the base plate joined to a plurality of sidewall panels. In this embodiment, when a composite deck plate is used as the deck plate, the cut end of the base plate is connected to the side wall plate, so that the strength of the composite deck plate at the opening can be prevented from decreasing. Therefore, in a slab with an opening using a composite deck plate, the workability during construction can be improved while preventing the strength from decreasing at the opening.

[0014] The opening frame preferably has a flange piece formed on the periphery of the opening surface of the opening frame. In this embodiment, since the opening frame has the flange pieces, the rigidity of the side wall panels can be increased, and therefore, the decrease in strength at the opening can be further suppressed.

[0015] The protruding portion is preferably a rib extending perpendicular to the thickness direction of the deck plate. In this embodiment, since the opening frame has ribs, the rigidity of the side wall panel can be increased. This further suppresses the decrease in strength at the opening. In addition, since a part of the deck plate can be joined to the ribs protruding from the side wall panel, the workability of joining the part of the deck plate to the opening frame can be improved.

[0016] Each of the pair of side wall panels preferably has a plurality of ribs arranged at intervals in the thickness direction of the deck plate, and the cut end portion is joined to the plurality of ribs via reinforcing metal fittings that are bridged across the plurality of ribs. In this embodiment, the cut ends of the deck plate are joined to a plurality of ribs via reinforcing metal fittings, so that reduction in strength at the opening can be further suppressed.

[0017] The opening frame of the present invention is an opening frame for forming an opening penetrating the deck plate and concrete in the thickness direction for an opening slab which comprises a deck plate and concrete poured on the deck plate, and comprises a plurality of side wall panels which extend from one side to the other side in the thickness direction of the opening slab and form the inner surface of the opening, and connecting portions which connect adjacent ends of the plurality of side wall panels. By using the opening frame according to the present invention for a slab with an opening, it is possible to improve workability during construction while suppressing a decrease in strength at the opening of the slab with an opening. Effect of the Invention

[0018] According to this invention, it is possible to improve workability during construction while suppressing a decrease in strength at the opening. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a plan view of a slab with an opening according to an embodiment. [Diagram 2] Fig. 2(A) is a cross-sectional view taken along line AA in Fig. 1. Fig. 2(B) is a cross-sectional view taken along line BB in Fig. 2(A). [Diagram 3] FIG. 3 is a perspective view of the opening frame according to the embodiment. [Figure 4] FIG. 4 is a plan view of the opening frame according to the embodiment. [Diagram 5] FIG. 5 is a plan view of a slab with an opening according to a modified example. [Figure 6] FIG. 6 is a cross-sectional view taken along line CC in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line DD in FIG. [Figure 8] FIG. 8 is a plan view of a slab with an opening according to a further modified example. [Figure 9] FIG. 9 is a cross-sectional view taken along line EE in FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along the line FF in FIG. [Figure 11] FIG. 11 is a plan view of a slab with an opening according to a further modified example. [Figure 12] FIG. 12 is a cross-sectional view taken along line GG in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] <Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0021] Fig. 1 is a plan view of a slab 1 with an opening on a floor construction level of a building, and Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. However, concrete 5 is omitted in Fig. 1, and concrete is shown by imaginary lines in Fig. 2. Slab 1 with an opening is constructed by using a plurality of deck plates 2 as formwork and pouring concrete 5 onto the deck plates 2. Slab 1 with an opening is supported by, for example, beams. Beams include major and minor beams, and examples of such beams include precast beams (PCa beams) and steel beams.

[0022] In the following description, the direction in which the deck plate 2 extends is defined as the "length direction," and the direction in which the deck plates 2 are lined up is defined as the "width direction." Additionally, the direction along the thickness of the opening slab 1, which is perpendicular to the length direction and width direction, may be referred to as the "thickness direction." Additionally, viewing an object along the thickness direction may be referred to as a "planar view."

[0023] In this specification, "parallel" includes not only cases where two lines, sides, faces, etc. do not intersect even when extended, but also cases where the angle between the two lines, sides, faces, etc. is within 10°. Additionally, "orthogonal" includes cases where the angle between the two lines, sides, faces, etc. is within 90°±10°.

[0024] The deck plate 2 according to this embodiment is a reinforcing bar deck plate 2a. The deck plate 2 includes a base plate 21 and a plurality of reinforcing bars 22 arranged on the base plate 21, as shown in FIG.

[0025] The base plate 21 constitutes one surface of the opening slab 1 in the thickness direction. The base plate 21 is, for example, a hot-dip galvanized steel plate. The base plate 21 has, for example, a thickness of 0.4 mm, a width of 600 mm, and a length of 600 mm to 7000 mm. A plurality of hanging members 24 are arranged on the base plate 21 at regular intervals along the length direction. Adjacent hanging members 24 are parallel to each other. The lower ends of the hanging members 24 are bent along the upper surface of the base plate 21 and joined onto the base plate 21. The upper ends of the reinforcing bars 22 are fixed to each hanging member 24 by welding. As a result, the truss 23 is suspended above the base plate 21.

[0026] As shown in Fig. 1, the reinforcing bars 22 include a plurality of trusses 23 arranged at regular intervals (e.g., 150 mm intervals) in the width direction on the substrate 21. As shown in Fig. 2, each truss 23 includes upper end bars 231 and lower end bars 232 that extend linearly in the length direction, and corrugated lattice bars 233 arranged between the upper end bars 231 and the lower end bars 232. The truss 23 according to this embodiment is a reinforcing bar truss having corrugated lattice bars 233, but the member connecting the upper end bars 231 and the lower end bars 232 does not have to be corrugated.

[0027] The upper end bars 231 and the lower end bars 232 extend parallel to each other. The upper end bars 231 are located higher than the lower end bars 232. As shown in FIG. 2(B), the upper end bars 231 are fixed below the top of the hanging material 24, and the lower end bars 232 are fixed to the upper end bars 231 via the lattice bars 233. In this way, the truss 23 is supported by the hanging material 24.

[0028] The slab with opening 1 has an opening 3. The opening 3 penetrates the slab with opening 1 in the thickness direction. As shown in Figs. 1 and 2, the opening 3 is formed by a square tubular opening frame 4. As shown in Fig. 3, the opening frame 4 includes a plurality of (four in this case) side wall plates 41, a connection portion 42 connecting adjacent side wall plates 41, and a protruding portion protruding from the side wall plate 41. The protruding portion includes a plurality of flange pieces 43 and a plurality of ribs 44. It is preferable that a metal plate is used as the material for the opening frame 4. An example of the metal plate is a steel plate. The thickness of the metal plate used for the opening frame 4 is, for example, 1.2 mm or more and 4.5 mm or less.

[0029] One surface (inner surface) of each side wall panel 41 constitutes the inner surface of the opening 3. The side wall panel 41 is formed in a flat plate shape, and extends from one surface to the other surface in the thickness direction of the slab with an opening 1. It is sufficient that the side wall panel 41 extends at least from one surface to the other surface in the thickness direction, and it may exceed the thickness of the slab with an opening 1.

[0030] The connection portion 42 connects adjacent side wall panels 41. In this embodiment, the connection portion 42 includes a connection piece 421 integral with the side wall panel 41 and a plurality of connection fittings 422 that connect adjacent connection pieces 421 to each other. The connection pieces 421 are provided on both ends of one side wall panel 41 in a direction perpendicular to the thickness direction of the opening slab 1. In this embodiment, the angle α between the side wall panel 41 and the connection piece 421 is about 135°. However, the angle α between the side wall panel 41 and the connection piece 421 may be 270° when the angle α between each of the adjacent side wall panels 41 is summed up. For example, the angle α between one side wall panel 41 of the adjacent side wall panels 41 may be 90°, and the angle α between the other side wall panel 41 may be 180°.

[0031] Examples of the connecting fittings 422 include bolts and nuts, rivets, one-sided bolts, screws, etc. When the two connecting pieces 421 are overlapped and fixed with the connecting fittings 422, the adjacent side wall plates 41 are perpendicular to each other. In this way, a rectangular tubular (square tubular) opening frame 4 is formed.

[0032] The connection portion 42 does not have to connect adjacent connection pieces 421 with the connection fittings 422. The connection portion 42 may be formed by joining adjacent connection pieces 421 by welding such as spot welding, or may be formed only by a welded portion that joins the side wall plates 41 by fillet welding or the like without providing the connection pieces 421. Furthermore, adjacent side wall plates 41 may be connected to each other by bending a single metal plate. In this case, the corner portion that connects adjacent side wall plates 41 to each other is defined as the connection portion 42. Furthermore, the connection portion 42 may connect adjacent side wall plates 41 to each other in a C-chamfered shape in a cross section.

[0033] The flange pieces 43 are formed on the periphery of the opening surface of the opening frame 4. The flange pieces 43 protrude outward (i.e., toward the concrete 5) from both ends of one side wall panel 41 in the thickness direction of the opening slab 1. The flange pieces 43 are formed at the ends of the side wall panel 41 over the entire length in a direction perpendicular to the thickness direction of the opening slab 1. The flange pieces 43 are formed integrally with the side wall panel 41 by bending. The flange pieces 43 may be joined to the side wall panel 41 by welding, not limited to bending.

[0034] The lower flange piece 43 faces the underside of the base plate 21 of the deck plate 2, and is preferably connected by welding while facing the underside of the base plate 21. The upper flange piece 43 faces the upper surface of the concrete 5, and is embedded in the concrete 5 so as to be flush with the upper surface of the concrete 5.

[0035] The rib 44 protrudes from the side wall plate 41 toward the outside (concrete 5 side). The rib 44 is formed in a strip shape and is perpendicular to the thickness direction of the slab 1 with an opening (thickness direction of the deck plate 2). In this embodiment, two ribs 44 are provided for one side wall plate 41. The side wall plate 41 provided with the rib 44 is a pair of opposing side wall plates 41 out of the four side wall plates 41, and is perpendicular to the length direction of the slab 1 with an opening. The rib 44 according to this embodiment is formed by joining a metal processed member bent into a substantially U-shaped cross section to the outer surface of the side wall plate 41. As the metal processed member, a metal plate may be bent into a substantially U-shaped cross section, or a channel steel (channel material) may be used.

[0036] As shown in FIG. 2, the cut end of the reinforcing bar 22 facing the opening 3 is joined to the rib 44. The cut end of the upper end bar 231 is joined to the lower surface of the upper rib 44 (sometimes referred to as the "upper rib 441"), and the cut end of the lower end bar 232 is joined to the upper surface of the lower rib 44 (sometimes referred to as the "lower rib 442"). The cut end of the reinforcing bar 22 may be joined to the rib 44 by, for example, welding, fixing with metal fittings, or fixing with bolts and nuts. The cut end of the reinforcing bar 22 may also be joined to the rib 44 by fitting the upper end bar 231 and the lower end bar 232 between a pair of ribs 44. In this embodiment, the upper end bar 231 and the lower end bar 232 are joined to the rib 44 via the reinforcing metal fittings 25.

[0037] The reinforcing metal fitting 25 includes an upper fixing portion 251 connected to the upper end bar 231, a lower fixing portion 252 fixed to the lower end bar 232, and a connecting portion 253 connecting the upper fixing portion 251 and the lower fixing portion 252. The upper fixing portion 251 is not particularly limited as long as it can fix the upper end bar 231, but is preferably formed in an approximately inverted U shape. The upper fixing portion 251 is fixed to the upper rib 441, for example, by welding. The lower fixing portion 252 is not particularly limited as long as it can fix the lower end bar 232, but is preferably formed in an approximately U shape. The lower fixing portion 252 is fixed to the lower rib 442, for example, by welding. The connecting portion 253 connects the upper fixing portion 251 and the lower fixing portion 252, and the reinforcing metal fitting 25 is bridged from the upper rib 441 to the lower rib 442. The reinforcing metal fitting 25 according to this embodiment is formed by bending a single metal plate, so that the upper fixing portion 251, the lower fixing portion 252, and the connecting portion 253 are integrally formed.

[0038] Note that the reinforcing metal fittings 25 do not have to be provided, and for example, the cut end of the upper end reinforcement 231 may be joined to the upper surface of the upper rib 441. Similarly, the cut end of the lower end reinforcement 232 may be joined to the lower surface of the lower rib 442. Note that the "cut end" in this specification refers to the end of the reinforcing bar 22, the base plate 21, etc. on the main body side that is exposed after cutting the portion corresponding to the opening 3. The cut end may be formed on-site or at the time of shipment from the factory.

[0039] To form an opening slab 1 using such an opening frame 4, for example, in the portion corresponding to the opening 3, the upper end reinforcement 231, the lower end reinforcement 232 and the lattice reinforcement 233 are cut in advance into two rows, and the deck plate 2 with the base plate 21 cut is supported on beams, and the opening frame 4 is placed in a corresponding position on the deck plate 2. After that, the upper rib 441 and the lower rib 442 of the side wall panel 41 are joined to the upper end reinforcement 231 and the lower end reinforcement 232 via the reinforcing metal fittings 25, and the lower flange piece 43 is joined to the base plate 21.

[0040] With the opening frame 4 installed on the deck plate 2, concrete 5 is poured. Usually, when a part of the reinforcing bar 22 is cut to form the opening 3, the weight of the opening slab 1 such as the concrete 5 and the weight of workers and work equipment are applied to the deck plate 2, which may cause a lack of strength, and therefore it is necessary to install shoring. However, in this embodiment, the cut end of the reinforcing bar 22 is joined to the opening frame 4, so that the opening frame 4 functions as a reinforcing member for the reinforcing bar 22, and even if the above load is applied to the deck plate 2, the opening slab 1 can be formed without installing shoring (i.e., without shoring). Moreover, the side wall panel 41 of the opening frame 4 also functions as a flow stopper for the concrete 5 when the concrete 5 is poured, so there is no need to install a separate flow stopper for the concrete 5, and workability is high.

[0041] <Modification> The above embodiment is merely one of various embodiments of the present invention. The embodiment can be modified in various ways depending on the design, etc., as long as the object of the present invention can be achieved. The modified examples described below can be applied in appropriate combination.

[0042] In the above embodiment, the deck plate 2 is described as a reinforcing bar deck plate 2a having reinforcing bars 22, but it is possible to use various deck plates 2. The deck plate 2 may be a flat deck plate 2b as shown in Figs.

[0043] The flat deck plate 2b comprises a base plate 26 and a plurality of support portions 27 formed integrally on the lower surface of the base plate 26. The support portions 27 are formed by bending the base plate 26 and flattening the protruding tips of the ribbed portions. The support portions 27 extend in the longitudinal direction of the open slab 1 and have a uniform cross-sectional shape.

[0044] To install the opening frame 4 on the flat deck plate 2b, an opening corresponding to the opening 3 is formed in advance in the flat deck plate 2b, and the opening frame 4 is fitted into this opening. For example, plate members having connecting pieces 421 and side wall plates 41 are placed along the periphery of the opening, and adjacent plate members are connected using connecting fittings 422. This allows the opening frame 4 to be installed in the opening.

[0045] As shown in Figs. 6 and 7, the opening frame 4 has one rib 44, which is a protruding portion, provided on each of the four side wall panels 41. That is, in this embodiment, the rib 44 is provided around the entire circumference of the opening frame 4. The cut end (opening end) of the base plate 26 of the flat deck plate 2b is joined to the lower surface of the rib 44 of the opening frame 4. In addition, in the side wall panels 41 perpendicular to the longitudinal direction of the opening slab 1, in addition to the joining of the rib 44 and the base plate 26, the mounting portion 27 is joined to the lower flange piece 43. In this state, the opening slab 1 can be formed by pouring concrete 5 and hardening the concrete 5.

[0046] 8, 9 and 10, the deck plate 2 may be a composite deck plate 2c. The composite deck plate 2c includes a base plate 28 in which a plurality of peaks 281 and valleys 282 are formed so as to be alternately arranged in the width direction of the slab with an opening. The peaks 281 and valleys 282 extend in the length direction of the slab with an opening and have a uniform cross-sectional shape. The slab with an opening 1 is formed by pouring concrete 5 onto the upper surface of the composite deck plate 2c.

[0047] To install the opening frame 4 on the composite deck plate 2c, an opening corresponding to the opening 3 is formed in advance in the composite deck plate 2c, and the opening frame 4 is fitted into this opening. For example, a plate having a connecting piece 421 and a side wall plate 41 is placed along the periphery of the opening, and adjacent plate materials are connected using a connecting metal fitting 422. This allows the opening frame 4 to be installed in the opening.

[0048] 10, the opening frame 4 is provided with one rib 44 on each of two side wall panels 41 perpendicular to the longitudinal direction. The upper surface of the peak portion 281 of the base plate 28 is joined to the lower surface of the rib 44 of the opening frame 4, and the lower surface of the valley portion 282 of the base plate 28 is joined to the upper surface of the lower flange piece 43. In this state, concrete 5 is poured and allowed to harden, thereby forming the slab 1 with an opening.

[0049] In the above embodiment, an opening slab 1 constitutes the floor structure of a building, but in a building, if the opening slab 1 has an opening 3, it may be applied to a roof structure or a wall structure.

[0050] 11 and 12, the connecting portion 42 may have an angle α1 between one of the adjacent side wall panels 41 and the connecting piece 421 of 90°, and an angle α2 between the other side wall panel 41 and the connecting piece 421 of 180°. In this modification, the connecting pieces 421 are preferably joined together by welding, but may be fixed with connecting fittings as in the embodiment.

[0051] In the above embodiment, two upper end reinforcing bars 231 and two lower end reinforcing bars 232 are joined to one side wall panel 41, but one upper end reinforcing bar 231 and one lower end reinforcing bar 232 may be joined to one side wall panel 41. This allows a stronger slab 1 with an opening to be constructed. In addition, it is preferable that the upper rib 441 has a longer protruding dimension than the flange piece 43. This allows a stronger opening frame 4 to be constructed, and a stronger slab 1 with an opening to be constructed.

[0052] In the above embodiment, the opening frame 4 is arranged so that the side wall panels 41 are perpendicular to the longitudinal direction of the opening slab 1, but for example, the side wall panels 41 may be arranged so that they are inclined with respect to the longitudinal direction. For example, the opening frame 4 may be arranged so that the side wall panels 41 are inclined at 45° with respect to the longitudinal direction.

[0053] As described above, the present specification includes the following embodiments.

[0054] Item 1. A slab with an opening 1 comprising a deck plate 2, concrete 5 poured on the deck plate 2, and an opening 3 penetrating the deck plate 2 and the concrete 5 in the thickness direction, the opening 3 having a square cylindrical opening frame 4 formed by connecting adjacent ends of a plurality of side wall panels 41 constituting the inner surface of the opening 3, the plurality of side wall panels 41 extending from one side to the other in the thickness direction of the slab with an opening 1, and cut ends facing the opening 3 of the deck plate 2 are joined. Item 2. The deck plate 2 is a reinforced deck plate 2a having a base plate 21 and reinforcing bars 22 arranged on the base plate 21, and cut ends of the reinforcing bars 22 and the base plate 21 are joined to two opposing side wall panels 41 out of a plurality of side wall panels 41, and cut ends of the base plate 21 are joined to the other two side wall panels 41. The slab 1 with an opening described in item 1. Item 3. The deck plate 2 is a flat deck plate 2b having a base plate 26 embedded in concrete 5, and cut ends of the base plate 26 are joined to a plurality of side wall panels 41. The slab 1 with an opening described in item 1. Item 4. The deck plate 2 is a composite deck plate 2c having a base plate 28 laid under the concrete 5, and the cut ends of the base plate 28 are joined to a plurality of side wall panels 41. The slab 1 with openings described in item 1. Item 5. The opening slab 1 according to any one of items 1 to 4, wherein the protruding portion has a flange piece 43 formed on the periphery of the opening surface of the opening frame 4. Item 6. The opening frame 4 has a rib 44 protruding from at least one of the multiple side wall panels 41 toward the concrete 5, and the rib 44 is perpendicular to the thickness direction. A slab 1 with an opening according to any one of items 1 to 5. Item 7. The slab 1 with opening described in item 6, wherein the rib 44 is joined to the cut end of the deck plate 2. Item 8. An opening frame 4 for forming an opening 3 penetrating the deck plate 2 and the concrete 5 in the thickness direction for an opening slab 1 having a deck plate 2 and concrete 5 poured on the deck plate 2, the opening frame 4 including a plurality of side wall panels 41 extending from one surface of the opening slab 1 in the thickness direction to the other surface and constituting the inner surface of the opening 3, and a connection portion 42 connecting adjacent ends of the plurality of side wall panels 41. [Explanation of symbols]

[0055] 1 Slab with opening 2 Deck plate 2a Reinforced deck plate 21 Substrate 22 Reinforcement 2b Flat deck plate 26 Substrate 2c Composite deck plate 28 Substrate 3 Opening 4 Opening Frame 41 Side wall panel 42 Connection 43 Flange piece 44 Ribs 5. Concrete

Claims

1. Deck plate and Concrete poured on the deck plate; An opening penetrating the deck plate and the concrete in a thickness direction; A slab with an opening, The opening has a rectangular cylindrical opening frame formed by connecting adjacent ends of a plurality of side wall plates that form an inner surface of the opening, The plurality of side wall panels extend from one surface to the other surface of the opening-equipped slab in a thickness direction, Among the plurality of side wall panels, at least a pair of opposing side wall panels have protruding portions protruding outward, and cut ends of the deck plate facing the opening are joined to the protruding portions. Slab with opening.

2. The deck plate is a reinforcing bar deck plate having a base plate and a reinforcing bar provided on the base plate, The cut ends of the reinforcing bar and the base plate are joined to two opposing side wall plates among the plurality of side wall plates, and the cut ends of the base plate are joined to the other two side wall plates. The perforated slab according to claim 1.

3. the deck plate is a flat deck plate having a base plate embedded in the concrete, The cut end portions of the substrate are joined to the side wall plates. The perforated slab according to claim 1.

4. the deck plate is a composite deck plate having a substrate laid under the concrete, The cut end portions of the substrate are joined to the side wall plates. The perforated slab according to claim 1.

5. The protruding portion has a flange piece formed on the periphery of the opening surface of the opening frame. A slab with an opening according to any one of claims 1 to 4.

6. The protruding portion has a rib perpendicular to the thickness direction of the deck plate. A slab with an opening according to any one of claims 1 to 4.

7. Each of the pair of side wall plates has a plurality of the ribs, The plurality of ribs are spaced apart in a thickness direction of the deck plate, The cut end portion is joined to the plurality of ribs via a reinforcing metal fitting that is bridged across the plurality of ribs.

7. The aperture frame according to claim 6.

8. An opening frame for forming an opening penetrating the deck plate and the concrete in a thickness direction for an opening slab having a deck plate and concrete poured on the deck plate, A plurality of side wall plates extending from one surface to the other surface in the thickness direction of the opening-equipped slab and constituting an inner surface of the opening; a connection portion that connects adjacent ends of the plurality of side wall panels; Equipped with Among the plurality of side wall panels, at least a pair of opposing side wall panels have protruding portions to which cut ends of the deck plate facing the opening portion are joined, Opening frame.

9. The protruding portion has a rib perpendicular to the thickness direction of the deck plate. The aperture frame according to claim 8.

10. Each of the pair of side wall plates has a plurality of the ribs, The plurality of ribs are spaced apart in the thickness direction.

10. The aperture frame according to claim 9.

Images