Slab deck

Abstract

To suppress an increase in the number of steel frames and an increase in the cost of the steel frames, and improve construction efficiency.SOLUTION: A slab deck composed of a plurality of truss-streaked decks 10 arranged in a slab construction region between adjacent steel beams having a height difference in a structure and provided with main streaks 3 integrally framed on a plate surface of a deck plate 2 composed of steel plates, comprises an upper level horizontal deck 10A fixed to a first steel beam 11 located at a high level, a lower level horizontal deck 10B fixed to a second steel beam 12 located at a low level, and an inclined deck 10C arranged between the upper level horizontal deck 10A and the lower level horizontal deck 10B, joined to the respective decks 10A and 10B and extending diagonally.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a slab deck.

Background Art

[0002] Conventionally, as a construction method of a slab of a structure, for example, as shown in Patent Document 1, a construction method of constructing a slab by assembling reinforcing bars on the upper part of a deck plate and placing concrete on site is known.

[0003] In such a conventional slab construction method, as shown in FIG. 8, there is a slab deck 100 disposed in a slab construction area R between a pair of adjacent steel girders 101 and 102 having a height difference in a structure. In this case, when installing a floor step in a direction orthogonal to the deck span direction, a steel joist 103 is disposed at the floor step position, and the upper deck 100A located at a high level and the lower deck 100B located at a low level have different structures in height.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when providing a slab deck in a slab construction area between a pair of adjacent steel girders having a height difference as in the conventional case, a steel joist is required at the floor step position, and the amount of steel increases accordingly. That is, since it is difficult to bend the slab deck in the middle, it is necessary to provide a steel joist for receiving and supporting the upper deck and the lower deck between the steel girders having a height difference. Therefore, the increased material cost of the steel increases, and the construction labor is also time-consuming, so an improvement in work efficiency is required, and there is room for improvement in that regard.

[0006] This invention has been made in view of the above-mentioned problems, and aims to provide a slab deck that can suppress an increase in the amount of steel frame, suppress an increase in the cost of steel frame, and improve construction efficiency. [Means for solving the problem]

[0007] To achieve the above objective, the slab deck according to the present invention is a slab deck that is arranged in a slab construction area between adjacent steel beams having a difference in height in a structure, and is made up of multiple truss-reinforced decks equipped with main reinforcement integrally provided by framing the surface of a deck plate made of steel plate, and is characterized by comprising an upper horizontal deck fixed to a first steel beam located at a higher level, a lower horizontal deck fixed to a second steel beam located at a lower level, and an inclined deck arranged between the upper horizontal deck and the lower horizontal deck, joined to each deck and extending diagonally.

[0008] In the slab deck according to the present invention, by arranging an inclined deck between an upper horizontal deck fixed to a first steel beam and a lower horizontal deck fixed to a second steel beam, it is possible to arrange only a deck with truss reinforcement without having to provide additional steel beams for the step between the first and second steel beams which have different height differences. Therefore, the amount of steel can be reduced and the increase in steel material costs can be suppressed. Furthermore, this invention features a structure in which only decks with truss reinforcement are placed between steel beams of different heights. As a result, the construction of steel beams as in the conventional method is unnecessary, and the connection between each deck is also simple, thus improving construction efficiency.

[0009] Furthermore, in the slab deck according to the present invention, the main reinforcement comprises a first main reinforcement arranged on the deck plate side, a second main reinforcement arranged spaced apart from the first main reinforcement in the deck thickness direction, and a lattice member connecting the first main reinforcement and the second main reinforcement, and it is preferable that the main reinforcement of the inclined deck is joined to the respective main reinforcement of the upper horizontal deck and the lower horizontal deck by welding.

[0010] In this invention, the main reinforcement bars of each deck are welded together, resulting in a simple joining structure. This allows for easy joining of the upper horizontal deck, the lower horizontal deck, and the inclined deck. As the invention involves welding the main reinforcement bars together, the portion of the main reinforcement bars of the inclined deck that connects with the main reinforcement bars of the horizontal deck can be bent to an angle corresponding to the inclination angle of the inclined deck, allowing the main reinforcement bars of both decks to overlap and be welded together. In other words, in this case, the inclination angle of the inclined deck can be set arbitrarily, and a complex joining structure is not required, resulting in reduced construction costs and improved construction efficiency.

[0011] Furthermore, in the slab deck according to the present invention, it is preferable that the main reinforcement bars that join adjacent decks are welded together by flare welding while the main reinforcement bars are adjacent to each other.

[0012] In this invention, the main reinforcement bars of adjacent decks are overlapped and then flare-welded, allowing for strong fixation. [Effects of the Invention]

[0013] According to the slab deck of the present invention, it is possible to suppress the increase in the amount of steel frame, suppress the increase in the cost of steel frame, and improve construction efficiency. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view showing the installation state of a slab deck consisting of multiple truss-reinforced decks according to an embodiment of the present invention. [Figure 2] Figure 1 is a plan view of the slab deck as seen from above. [Figure 3] Figure 2 shows a view along line AA, which is a side view of a deck with truss reinforcement. [Figure 4] Figure 2 shows a view along the line BB, which is a side view of a deck with truss reinforcement. [Figure 5] This is a side view of the slab deck. [Figure 6]It is a cross-sectional view taken along line C-C shown in FIG. 5, and is a view showing the welding state of main reinforcement bars to be joined. [Figure 7] It is a side view showing the installation state of a conventional stepped slab deck.

Embodiments for Carrying out the Invention

[0015] Hereinafter, the slab deck according to the embodiment of the present invention will be described based on the drawings.

[0016] As shown in FIG. 1, the slab deck 1 of the present embodiment is composed of a plurality of decks 10 with truss bars arranged in a slab construction area R between a pair of steel girders 11 and 12 having a level difference in a structure.

[0017] Here, the separation direction between the steel girders 11 and 12 (the direction orthogonal to the extending direction of the steel girders 11 and 12) is referred to as the deck span direction X. Further, the direction orthogonal to the deck span direction X in plan view (corresponding to the extending direction of the steel girders 11 and 12) is referred to as the deck arrangement direction Y.

[0018] The deck 10 with truss bars according to the present embodiment is, for example, provided integrally with a reinforcing bar (main reinforcement bar 3 described later) embedded in concrete constituting the slab and a lower formwork (deck plate 2 described later). Here, the slab construction area R is an area surrounded by adjacent steel girders 11 and 12 in plan view seen from above. The deck 10 with truss bars is fixed in a state where the deck plate 2 is on the lower side and the main reinforcement bar 3 is directed upward and placed on the upper flanges 11A and 12A of the steel girders 11 and 1^{2}.

[0019] One of the pair of steel girders 11 and 12 located at a higher level is the first steel girder 11, and the other located at a lower level is the second steel girder 12. The level difference between the first steel girder 11 and the second steel girder 12 is arbitrarily set.

[0020] The deck 10 with truss bars includes a deck plate 2 made of a steel plate and main bars 3 that are integrally provided with a truss-like framework on one plate surface (upper surface 2a) of the deck plate 2. The deck 10 with truss bars has the deck plate 2 and the main bars 3 integrated by fixing means such as welding via suspension members 4 (see FIGS. 3 and 4).

[0021] As shown in FIGS. 1 and 2, the deck 10 with truss bars includes an upper horizontal deck (Upper level horizontal deck with truss reinforcement) 10A fixed to the first steel frame beam 11 and a lower horizontal deck (Lower deck with truss reinforcement) 10B fixed to the second steel frame beam 12, and an inclined deck (Sloping deck with truss reinforcement) 10C disposed between the upper horizontal deck 10A and the lower horizontal deck 10B and joined to the respective decks 10A, 10B and extending obliquely. The deck 10 with truss bars is divided into three parts in the deck span direction X of the steel frame beams 11, 12. And each of the decks 10A, 10B, 10C is installed in a predetermined slab construction area R by connecting its outer peripheral edge to the steel frame beams 11, 12 and the main bars between the decks.

[0022] The upper horizontal deck 10A and the lower horizontal deck 10B each extend such that the plate surface of the deck plate 2 is horizontal. The upper horizontal deck 10A is disposed at a lateral distance from the lower horizontal deck 10B and is at a higher position than the lower horizontal deck 10B. That is, a step is formed between the upper horizontal deck 10A and the lower horizontal deck 10B.

[0023] The deck plate 2 is a flat plate shaped like a rectangle in plan view in this embodiment. For example, a corrugated plate is adopted as the deck plate 2. As described above, the suspension members 4 are fixed to the upper surface 2a of the deck plate 2. The deck plate 2 is disposed with the upper surface 2a to which the suspension members 4 are fixed facing upward.

[0024] As shown in Figures 3 to 5, the main reinforcement 3 comprises a lower main reinforcement 31 (first main reinforcement) positioned on the deck plate 2 side, an upper main reinforcement 32 (second main reinforcement) positioned spaced above the lower main reinforcement 31 in the deck thickness direction, and a lattice member 33 connecting the lower main reinforcement 31 and the upper main reinforcement 32. The lower main reinforcement 31 and the upper main reinforcement 32 are each positioned with their longitudinal directions parallel to the deck span direction X. In this embodiment, the suspension member 4 has a truss body extending in the deck span direction X, formed by the combination of the lower main reinforcement 31, the upper main reinforcement 32, and the lattice member 33, arranged at regular intervals in the deck arrangement direction Y (see Figure 1). The arrangement interval in the deck arrangement direction Y of the truss body described above can be set as appropriate. In the following description, the lower main reinforcement 31 and the upper main reinforcement 32 may simply be referred to as the main reinforcement 3.

[0025] The upper surface 2a of the deck plate 2 is provided with a suspension member 4 made of wire having multiple bent portions that protrude upward. The suspension member 4 is positioned with its longitudinal direction oriented in the deck arrangement direction Y. The upper main reinforcement 32 is supported by being suspended from the top portion 4a of the suspension member 4 and fixed by welding. The lower main reinforcement bars 31 and upper main reinforcement bars 32 are positioned at a predetermined height relative to the upper surface 2a of the deck plate 2. The lower main reinforcement bars 31 are positioned at a distance from the upper surface 2a of the deck plate 2. The upper main reinforcement bars 32 are positioned to ensure the height dimension (cover thickness) from the upper main reinforcement bars 32 to the upper surface of the slab after concrete pouring.

[0026] As shown in Figures 3 and 5, the lattice material 33 is positioned between the lower main reinforcement 31 and the upper main reinforcement 32, and has an uneven surface with peaks 33a and valleys 33b. The valleys 33b of the lattice material 33 are welded to the lower main reinforcement 31, and the peaks 33a are welded to the upper main reinforcement 32, thus integrating them into one unit.

[0027] The inclined deck 10C is joined at one end in the deck span direction X to the free end of the upper horizontal deck 10A, and at the other end to the free end of the lower horizontal deck 10B. The main reinforcement bars 3 of the inclined deck 10C are joined to the respective main reinforcement bars 3 of the upper horizontal deck 10A and the lower horizontal deck 10B by welding. Specifically, the lower main reinforcement bars 31 of the inclined deck 10C are joined to the lower main reinforcement bars 31 of the upper horizontal deck 10A and the lower horizontal deck 10B, and the upper main reinforcement bars 32 of the inclined deck 10C are joined to the upper main reinforcement bars 32 of the upper horizontal deck 10A and the lower horizontal deck 10B.

[0028] The inclined deck 10C is joined to the upper horizontal deck 10A and the lower horizontal deck 10B, and the deck plate 2, lower main reinforcement 31, and upper main reinforcement 32 are inclined in a direction that intersects with the horizontal direction. The inclination angle of the inclined deck 10C is determined by the height difference between the pair of steel beams 11 and 12, and by conditions such as the distance between the upper horizontal deck 10A and the lower horizontal deck 10B. Furthermore, the main reinforcement bars 3 of the inclined deck 10C have bent portions 31A and 32A at the points where they connect with the main reinforcement bars 3 of the horizontal decks 10A and 10B, which are bent to an angle corresponding to the inclination angle of the inclined deck 10C so that they become horizontal in a predetermined installation state. In Figure 5, for clarity, the bent portions 31A and 32A are shown overlapping the main reinforcement bars 3 of the horizontal decks 10A and 10B in the vertical direction.

[0029] As shown in Figure 6, the joints between adjacent decks 10 are constructed by flare welding, with the main reinforcement bars 3 (first main reinforcement bars 31 and second main reinforcement bars 32) aligned horizontally and adjacent to each other. In Figure 6, the symbol W indicates the flare weld. Flare welding may be performed only on the upper sides of the lower main reinforcement bars 31 and upper main reinforcement bars 32, provided that a predetermined welding length is ensured.

[0030] Next, the function of the slab deck 1 described above will be explained in detail based on the drawings. As shown in Figures 1 and 5, in the slab deck 1 according to this embodiment, by arranging an inclined deck 10C between the upper horizontal deck 10A fixed to the first steel beam 11 and the lower horizontal deck 10B fixed to the second steel beam 12, it is possible to arrange only the deck 10 with truss reinforcement without providing additional steel beams for the step between the first steel beam 11 and the second steel beam 12, which have different height differences. Therefore, the amount of steel can be reduced, and the increase in steel material costs can be suppressed.

[0031] Furthermore, in this embodiment, only the truss-reinforced deck 10 is placed between steel beams 11 and 12 that have different height differences. As a result, the construction of steel beams as in the conventional method is unnecessary, and the connection between each deck 10 is also simple, thus improving construction efficiency.

[0032] Furthermore, in this embodiment, the main reinforcement 3 includes a lower main reinforcement 31 positioned on the deck plate 2 side, an upper main reinforcement 32 positioned spaced apart from the lower main reinforcement 31 in the deck thickness direction, and a lattice member 33 connecting the lower main reinforcement 31 and the upper main reinforcement 32. The inclined deck 10C is joined by welding the lower main reinforcement 31 and upper main reinforcement 32 of the upper horizontal deck 10A and the lower horizontal deck 10B to each other. This results in a simple joining structure in which the main reinforcement 3 of each deck 10A, 10B, and 10C are welded to each other, making it easy to join the upper horizontal deck 10A and the lower horizontal deck 10B to the inclined deck 10C. In this embodiment, since the main reinforcement bars 3 are welded together, by bending only the portion of the main reinforcement bar 3 of the inclined deck 10C that connects with the main reinforcement bars 3 of the horizontal decks 10A and 10B to an angle corresponding to the inclination angle of the inclined deck 10C, the main reinforcement bars 3 of both decks can be overlapped and welded together. In other words, in this case, the inclination angle of the inclined deck 10C can be set arbitrarily, and since the configuration does not involve a complex joining structure, it is possible to further reduce construction costs and improve construction efficiency.

[0033] Furthermore, in this embodiment, the lower main reinforcement bars 31 are positioned at a distance from the deck plate 2, and since the lower main reinforcement bars 31 and the deck plate 2 are separated, a welding space can be secured, making it easy and reliable to weld the lower main reinforcement bars 31 of the horizontal decks 10A and 10B to the lower main reinforcement bars 31 of the inclined deck 10C.

[0034] Furthermore, in this embodiment, the main reinforcement bars 3 of adjacent decks 10 (lower main reinforcement bars 31 and upper main reinforcement bars 32) are overlapped and then flare-welded, allowing for strong fixation.

[0035] As described above, the slab deck 1 according to this embodiment can suppress the increase in the amount of steel frame, reduce the increase in costs associated with the steel frame, and improve construction efficiency.

[0036] Although embodiments of the slab deck according to the present invention have been described above, the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit of the invention.

[0037] For example, the main reinforcement 3 in the embodiment described above has a configuration comprising a lower main reinforcement 31, an upper main reinforcement 32, and a lattice member 33, but the configuration is not limited to this.

[0038] Furthermore, the dimensions, aspect ratio, and thickness of the truss-reinforced deck 10 in plan view, as well as the type and thickness of the deck plate, can be changed as appropriate. In this embodiment, a suspension member 4 for connecting the main reinforcement 3 is provided on the upper surface 2a of the deck plate 2, but this suspension member 4 can be omitted.

[0039] Furthermore, although the main reinforcement bars 3 of the inclined deck 10C are joined to the respective main reinforcement bars 3 of the upper horizontal deck 10A and the lower horizontal deck 10B by flare welding, the joining structure is not limited to this type.

[0040] Furthermore, in this embodiment, the main reinforcement bars 3 (first main reinforcement bars 31 and second main reinforcement bars 32) that join adjacent decks 10 are welded together by flare welding while aligned horizontally. However, the joining structure is not limited to this configuration.

[0041] Furthermore, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, without departing from the spirit of the present invention. [Explanation of Symbols]

[0042] 1 Slab Deck 10 Truss-reinforced deck 10A Upper horizontal deck 10B Lower horizontal deck 10C Inclined Deck 11. First Steel Beam 12. Second Steel Beam 2 Deck Plates 2a Top surface (plate surface) 3 Main reinforcement 31 Lower main reinforcement (1st main reinforcement) 31A Bend part 32 Upper main bar (second main bar) 32A Bend part 33 Lattice material 4 Hanging materials R slab construction area W flare weld X deck span direction Y Deck Alignment Direction

Claims

1. A slab deck is formed by connecting multiple truss-reinforced decks, each deck being positioned in a slab construction area between adjacent steel beams having a difference in elevation within a structure, and comprising a deck plate made of steel plate and main reinforcement integrally provided by framing the surface of the deck plate. The upper truss reinforced horizontal deck is fixed to the first steel beam located at a high level, A lower truss-reinforced horizontal deck is fixed to the second steel beam located at a lower level, A truss-supported inclined deck is positioned between the upper horizontal deck with truss reinforcement and the lower horizontal deck with truss reinforcement, and is joined to each deck, extending diagonally. A slab deck characterized by being made of the same material.

2. The main reinforcement is, The first main reinforcement bar is positioned on the deck plate side, A second main reinforcement is arranged spaced apart from the first main reinforcement in the direction of the deck thickness, It has a lattice member connecting the first main reinforcement and the second main reinforcement, The slab deck according to claim 1, wherein the main reinforcement of the truss-reinforced inclined deck is joined by welding to the main reinforcement of the upper truss-reinforced horizontal deck and the lower truss-reinforced horizontal deck, respectively.

3. The slab deck according to claim 1 or 2, wherein the main reinforcing bars that join adjacent decks are welded together by flare welding while the main reinforcing bars are adjacent to each other.

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