JP2013163914A - Slab constructing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slab constructing material which can surely fix a reinforcement truss on the upper surface of a metal deck and construct a slab having sufficient strength.SOLUTION: A slab constructing material 10A includes a metal deck 11 with a predetermined area, a plurality of reinforcement trusses 12 installed on the upper surface 16 of the metal deck 11 and extending back and forth, and a plurality of horizontal reinforcements 13 located on the upper surface 16 of the metal deck 11, extending horizontally, and arranged at a predetermined distance from each other in a back and forth direction. In the slab constructing material 10A, upper end projections 27 of lattice reinforcements 26A, 26B of the reinforcement truss 12 are welded to an upper end reinforcement 24, intermediate parts 28 of the lattice reinforcements 26A, 26B are welded to lower end reinforcements 25A, 25B, the horizontal reinforcements 13 are arranged on bottom parts 30 of lower end recesses 29 of the lattice reinforcements 26A, 26B and welded to a projection 18 formed on the metal deck 11, and the lower end recesses 29 of the lattice reinforcements 26A, 26B are pinched by the upper surface 16 of the metal deck 11 and the horizontal reinforcements 13.

Description

  The present invention relates to a slab construction material for constructing a slab of a steel structure or a reinforced concrete structure.

  It is formed from a steel plate of a predetermined area that has been plated and a plurality of reinforcing bars trusses installed on the upper surface of the steel plate. It is bridged between horizontal beams, and ordinary concrete or lightweight concrete is cast to form a steel structure or reinforced concrete. A slab construction material for constructing a slab of a building is disclosed (see Patent Document 1). The reinforcing bar truss is an upper end bar that is spaced upward from the upper surface of the iron plate and extends in the vertical direction, a lower end bar that is positioned between the iron plate and the upper bar, and extends in the vertical direction, and a vertical direction between the iron plate and the upper bar. It is formed of lattice muscles extending in the front-rear direction while repeatedly bending in a wavy shape.

  In this slab construction material, spot welding is performed on the upper end muscle in a state where the upper end of the lattice muscle is in contact with the upper end muscle, and spot welding is performed on the lower end muscle in a state where the middle portion of the lattice is in contact with the lower end muscle. The lower end of the lattice line is spot welded to the iron plate while being bent laterally outward so as to be parallel to the upper surface of the iron plate.

JP 2007-170161 A

  In the slab building material disclosed in the above publication, an automatic welding machine including an electrode and a moving mechanism is used to spot weld the lower end of the lattice to the iron plate. As an example of welding by an automatic welder, the electrode is located above the lower end of the lattice, the electrode is located below the lower surface of the iron plate, the electrode descends toward the lower end of the lattice, The electrodes rise toward the lower surface of the iron plate, and while pressing the lower end portion of the lattice and the iron plate by the electrodes, the lower end portion and the iron plate are sandwiched, and at the same time, a predetermined current flows through the electrodes. The current flowing from the electrode instantaneously melts the lower end of the lattice and the iron plate, and they are welded together.

  In this slab construction material, welding of the lower end of the lattice bar and the iron plate proceeds from time to time in the front-rear direction front to back of the slab construction material, but welding is performed while the lattice bar and the iron plate are pressed by the electrodes. Later lattices are distorted toward the upper surface of the steel plate, so that the lower end of the pre-weld lattice bars located behind the welded lattice may float up from the upper surface of the steel plate, and the lattice muscles to be welded later When the lower end of the steel plate is separated upward from the steel plate, the lower end of the lattice cannot be sufficiently welded to the steel plate, and the rebar truss and iron plate are unintentionally released due to unwelding or insufficient welding There is.

  When the rebar truss (the lower end of the lattice bar) and the steel plate are released, even if concrete is placed on the slab construction material, the concrete and the steel plate and the rebar truss cannot form a reinforced concrete structure. When bending tensile force, bending compressive force, or shearing force is applied to concrete, the concrete may be easily damaged by the force, and a slab having insufficient strength may be constructed.

  Further, when the lower end portion of the lattice is directly welded to the upper surface of the iron plate, the heat effect during welding causes not only the upper surface of the iron plate but also the lower surface of the iron plate to be marked by welding. The weld marks generated on the lower surface of the steel plate not only detract from the aesthetics of the slab construction material, but also eliminate the plating applied to prevent corrosion and expose the iron, which may cause rust on the weld marks due to moisture and condensation. is there.

  An object of the present invention is to provide a slab construction material capable of reliably fixing a lattice bar forming a reinforcing bar truss to the upper surface of a metal deck and constructing a slab having sufficient strength. Another object of the present invention is to provide a slab construction material that does not cause welding marks on the lower surface of the metal deck and can prevent the occurrence of rust on the lower surface of the metal deck.

  The premise of this invention for solving the said subject is the slab construction material for constructing the slab of a predetermined area.

  The feature of the present invention based on the above premise is that the slab construction material has a metal deck having a predetermined area having both side edges extending in the front-rear direction and both end edges extending in the lateral direction, and is installed on the upper surface of the metal deck and extends in the front-rear direction. A plurality of rebar trusses and a plurality of horizontal bars located on the upper surface of the metal deck and extending in the lateral direction and arranged at a predetermined distance in the front-rear direction, the metal deck protrudes upward from the upper surface and extends in the front-rear direction It has a plurality of protrusions that extend and are spaced apart by a predetermined dimension in the lateral direction, and the reinforcing bar truss is located between the pair of protrusions aligned in the lateral direction and is located above the upper surface of the metal deck in the front-rear direction. A pair of lower end bars extending between the pair of convex portions and between the pair of convex portions and between the metal deck and the upper portion top stripes and extending in the front-rear direction. Wavyly bent up and down between The lattice is formed from a pair of lattice muscles extending in the front-rear direction, and the lattice muscles from the upper end convex portion that contacts the upper end muscle and bends in a convex shape to the lower end recess that contacts the upper surface of the metal deck and bends in a concave shape. The upper side convex part of these lattices is welded to the upper part, the middle part of these lattices is welded to the lower part, and these horizontal lines are arranged in the lower part recess of these lattices. In other words, the lower end recesses of the lattice bars are sandwiched between the upper surface of the metal deck and the horizontal bars.

  As an example of the slab construction material according to the present invention, the lattice bar is made of a metal rod having a circular cross section, and the height dimension from the upper surface of the metal deck of the convex portion is substantially the same as or slightly larger than the diameter of the lattice bar. In the construction material, when the horizontal streak is arranged in the lower end concave portion of the lattice, the horizontal streak contacts the top portion of the convex portion.

  As another example of the slab building material according to the present invention, the horizontal bar is made of a metal bar having a circular cross section, and in the slab building material, when the horizontal bar is arranged in the lower end recess of the lattice bar, the horizontal bar is the lower end recess of the lattice bar. The lower end concave portion is bent in a substantially V shape so as to be positioned at the bottom portion of the.

  As another example of the slab building material according to the present invention, the lower end muscles are located outside the lattice lines and located inside the pair of convex portions, and the lower end concave portions of the lattice lines are inside the pair of convex portions. The horizontal stripes and the convex portions are welded by spot welding.

  As another example of the slab construction material according to the present invention, the lower end muscles are located inside the lattice bars and located inside the pair of convex portions, and the lower end concave portions of the lattice bars are inside the pair of convex portions. The horizontal stripes and the convex portions are welded by spot welding.

  As another example of the slab construction material according to the present invention, one side edge of the metal deck is bent downward from the deck to form a first engagement portion, and the other side edge of the metal deck is the deck. A second engagement portion that is bent upward to engage with the first engagement portion is formed, and the end of the horizontal stripe that extends to the vicinity of the second engagement portion on the other side edge portion of the metal deck extends from the convex portion. It is bent downward toward the top surface of the metal deck.

  As another example of the slab construction material according to the present invention, in the slab construction material, the reinforcing bar trusses are arranged with a predetermined distance in the lateral direction, and a void extending in the front-rear direction is installed between the adjacent reinforcing bar trusses. .

  According to the slab construction material according to the present invention, the horizontal bars are arranged in the lower end concave portions of the lattice bars and welded to the convex portions formed on the metal deck, and the lower end concave portions of the lattice bars are connected to the upper surface of the metal deck and the horizontal bars. The lattice bars forming the reinforcing bar truss are fixed to the upper surface of the metal deck, so that the reinforcing bar truss can be securely fixed to the upper surface of the metal deck. Even if the concrete, metal deck and reinforced truss form a reinforced concrete structure and bending tensile force, bending compressive force, and shearing force are applied to the concrete placed in the slab construction material, it will not be inadvertently released. The concrete is not damaged by these forces, and a slab having sufficient strength can be constructed. Since the slab construction material is welded to the convex part made in the metal deck, the lower end concave part of the lattice line only abuts the upper surface of the metal deck, and the lower end concave part is not welded to the metal deck. Of course, the appearance of welding is not generated on the lower surface of the metal deck, and the occurrence of rust on the lower surface of the metal deck can be prevented.

  The lattice is made of a metal bar with a circular cross section, the height of the convex part made on the metal deck from the top surface of the deck is almost the same or slightly larger than the diameter of the lattice, and the horizontal line is the lower end of the lattice. When placed, the slab construction material in which the horizontal bars contact the top part of the convex part, because the horizontal bars always contact the top part of the convex part, the horizontal bars can be securely fixed to the top part of the convex part by welding, Lattice bars that form the reinforcing bar truss are fixed to the upper surface of the metal deck, and the reinforcing bar truss is securely fixed to the upper surface of the metal deck. Can do. In the slab construction material, the rebar truss and the metal deck are not inadvertently released, and the concrete placed in the slab construction material is securely reinforced by the upper and lower reinforcement bars and the lattice bars, and the concrete and metal deck and Reinforced trusses form a reinforced concrete structure, and even if bending tensile force, bending compressive force, or shearing force acts on the concrete, the concrete will not be damaged by these forces, and a slab with sufficient strength can be constructed. it can.

  When the horizontal bar is made of a metal bar having a circular cross section, and the horizontal bar is arranged in the lower recess of the lattice, the lower recess is bent into a substantially V shape so that the horizontal bar is located at the bottom of the lower recess of the lattice. In the slab building material, the horizontal stripe is moved to the bottom of the bottom recess when the horizontal stripe is placed in the bottom recess of the lattice when the lower stripe of the lattice is bent in a V shape. The horizontal stripes can be prevented from shifting in the front-rear direction, and the horizontal stripes can be reliably brought into contact with a certain portion of the convex portion.There is no need to separately position the horizontal stripes with respect to the lattice muscles. It can be securely fixed to the part by welding. Since the slab construction material can securely and sufficiently fix the horizontal bars and the convex parts, the lower end concave parts of the lattice bars are sandwiched between the upper surface of the metal deck and the horizontal bars to form a reinforcing bar truss. The bar is fixed to the upper surface of the metal deck, and the reinforcing bar truss can be securely fixed to the upper surface of the metal deck.

  The bottom stripes are located outside the lattice stripes and inside the pair of projections, the bottom depressions of the lattice stripes are located inside the pair of projections, and the horizontal stripes and the projections are welded by spot welding. In the slab building material that is used, spot welding between the horizontal streaks and the convex portions is performed by placing electrodes above the horizontal streaks and below the convex portions and sandwiching the horizontal streaks and the convex portions between the electrodes, and welding them. Is located on the inside of the convex part, the bottom line does not interfere with the electrode, and it is easy to weld the horizontal line and the convex part with the electrode, and the electrode ensures the horizontal line and the convex part. Can be fixed by welding. Since the slab construction material can securely weld and fix the horizontal streaks and the convex portions, the lower end concave portions of the lattice bars are sandwiched between the upper surface of the metal deck and the horizontal bars, so that the lattice bars forming the reinforcing bar truss are formed. It is fixed to the upper surface of the metal deck, and the reinforcing bar truss can be securely fixed to the upper surface of the metal deck.

  These lower streaks are located inside these lattice muscles and inside the pair of convex portions, the lower end concave portions of these lattice muscles are located inside the pair of convex portions, and the horizontal and convex portions are welded by spot welding. In the slab building material that is used, spot welding between the horizontal streaks and the convex portions is performed by placing electrodes above the horizontal streaks and below the convex portions and sandwiching the horizontal streaks and the convex portions between the electrodes, and welding them. Is located on the inside of the convex portion, and the lower end concave portion of the lattice muscle is located on the inner side of the convex portion. And the convex part can be easily welded, and the horizontal stripe and the convex part can be reliably welded and fixed by these electrodes. Since the slab construction material can securely weld and fix the horizontal streaks and the convex portions, the lower end concave portions of the lattice bars are sandwiched between the upper surface of the metal deck and the horizontal bars, so that the lattice bars forming the reinforcing bar truss are formed. It is fixed to the upper surface of the metal deck, and the reinforcing bar truss can be securely fixed to the upper surface of the metal deck.

  The slab construction material in which the end of the horizontal line extending to the vicinity of the second engaging portion on the other side edge portion of the metal deck is bent downward from the convex portion toward the upper surface of the metal deck is the second engaging portion. When the end of the horizontal line extending in the vicinity is not bent toward the upper surface of the metal deck and extends straight, when the first engagement portion of the metal deck is engaged with the second engagement portion, The ends of the horizontal bars obstruct the engagement of the engaging parts, and the engaging parts cannot be smoothly engaged. However, the ends of the horizontal bars extending in the vicinity of the second engaging part are on the upper surface of the metal deck. Since the end of the horizontal bar does not interfere with the engagement of the engaging portions, the engaging portions can be smoothly engaged, and a plurality of slab building materials can be obtained. Easy assembly of slab building materials of a given area by connecting in the horizontal direction Kill.

  The slab building materials in which the reinforced trusses are arranged with a predetermined distance in the lateral direction and voids extending in the front-rear direction are installed between the adjacent reinforced trusses, voids are used instead of concrete. It is not necessary to place concrete in the entire area, and it is possible to omit the void volume of concrete, so that it is possible to reduce the labor and time for that amount, and to reduce the cost of slab construction. Compared to the case where only concrete is placed on the slab building material, the void volume of concrete can be omitted, so the slab can be reduced in weight, and the load applied to the steel structure and reinforced concrete structure Can be reduced.

The perspective view of the slab construction material shown as an example. The top view of a slab construction material. The front view of a slab construction material. The partial side view of a slab construction material. Those partial enlarged views which expand and show a horizontal stripe and the lower end recessed part of a lattice muscle. The elements on larger scale of a horizontal streak and a convex part shown in the state before spot welding. The elements on larger scale of a horizontal streak and a convex part shown in the state after spot welding. The front view of one slab construction material. The top view of the slab construction material shown as another example. The front view of a slab construction material. The partial side view of a slab construction material.

  The details of the slab building material according to the present invention will be described below with reference to the accompanying drawings such as FIG. 1 which is a perspective view of the slab building material 10A shown as an example. 2 is a top view of the slab construction material 10A, and FIG. 3 is a front view of the slab construction material 10A. FIG. 4 is a partial side view of the slab construction material 10A, and FIG. 5 is an enlarged partial view of the horizontal stripes 13 and the lower end recesses 29 of the lattice stripes 26A and B. 6 is a partially enlarged view of the horizontal stripe 13 and the convex portion 18 shown in a state before spot welding, and FIG. 7 is a partial enlarged view of the horizontal stripe 13 and the convex portion 18 shown in a state after spot welding. is there. FIG. 8 is a front view of one slab construction material 10A. 1-4, the front-rear direction is indicated by an arrow A, the horizontal direction is indicated by an arrow B, and the up-down direction is indicated by an arrow C.

  The slab construction material 10A includes a metal deck 11 having a predetermined area that is long in the front-rear direction, a plurality of reinforcing bars truss 12 that are arranged on the metal deck 11 and arranged in the lateral direction, and are arranged on the metal deck 11 at equal intervals in the front-rear direction. It is made from a plurality of lateral muscles 13 (fixed muscles) arranged in a row. The slab construction material 10A is used to construct a slab (not shown) such as a floor slab, a ceiling slab, or a roof slab having a predetermined area.

  The metal deck 11 has both side edges 14A and 14B extending in the front-rear direction and both end edges 15A and 15B extending in the lateral direction, and has a flat upper surface 16 and a lower surface 17. An iron plate is used for the metal deck 11, and the upper and lower surfaces 16 and 17 are plated. A printed metal plate can be used as the metal deck 11. On the lower surface of the printed metal plate, predetermined designs (not shown) such as various patterns used for the floor and various patterns used for the ceiling are printed (printed).

  The metal deck 11 has a plurality of convex portions 18 that protrude upward from the upper surface 16 and extend in the front-rear direction. The convex portions 18 are arranged with a predetermined distance in the lateral direction. The convex portions 18 extend from the upper surface 16 of the metal deck 11 in a substantially straight shape upward and are separated from each other by a predetermined dimension in the lateral direction, and a top portion 20 extending substantially horizontally between the both side portions 19. And have. A space in which electrodes to be described later are located is formed between both side portions. The top portion 20 is formed with a protrusion 21 that is located at the center and protrudes upward.

  A first hook 22 (first engagement portion) is formed on one side edge portion 14A of the metal deck 11, and a second hook 23 (second engagement portion) is formed on the other side edge portion 14B. It has been. The first hook 22 bends one side edge portion 14A of the metal deck 11 upward from the upper surface 16 of the deck 11 and then further lowers the side edge portion 14A from the lower surface 17 of the deck 11 in the lateral direction. It is made from bending towards. The second hook 23 is formed by bending the other side edge 14B of the metal deck 11 upward from the top surface of the deck and inward in the lateral direction.

  Each metal deck 11 hooks the second hook 23 of the other metal deck 11 on the first hook 22 of the one metal deck 11, and engages the hooks 22, 23 with each other, so that each metal deck 11 is placed sideways. It can be connected in the direction and can be arranged in the horizontal direction in a state where a plurality of metal decks 11 are connected. The area of the metal deck 11 is not particularly limited, and the area can be freely changed.

  The reinforcing bar trusses 12 are disposed between the convex portions 18 formed on the deck 11 on the upper surface 16 of the metal deck 11 and extend parallel to each other in the front-rear direction. In this slab construction material 10A, two rebar trusses 12 are installed on the metal deck 11, but the number of rebar trusses 12 installed on the metal deck 11 is not particularly limited, and the area of the metal deck 11 and the truss 12 The number of trusses 12 to be installed on the deck 11 can be freely determined according to the size of the deck 11.

  The reinforcing bar trusses 11 are assembled from one upper bar 24, two (a pair) lower bars 25A and B, and two (a pair) lattice bars 26A and B. The upper end bars 24 are iron bars having a circular cross section made by extending iron, but deformed iron bars having nodes (ribs) on their peripheral surfaces can also be used. The upper end line 24 is located between the pair of convex portions 18 arranged in the lateral direction, and extends in a straight line in the front-rear direction with a predetermined distance away from the upper surface 16 of the metal deck 11. In each reinforcing bar truss 11, the lengths of the upper end bars 24 arranged in the lateral direction in the front-rear direction are the same, and the upper end bars 24 extend in parallel to each other.

  The lower end bars 25A and 25B are iron bars having a circular cross section made by extending iron, but deformed iron bars having nodes (ribs) on their peripheral surfaces can also be used. The lower end stripes 25A and B are located between the pair of convex portions 18 arranged in the lateral direction (positioned away from the convex portions 18 by a predetermined dimension), and located outside the lattice stripes 26A and B, It is located below the upper end stripe 24 and on both lateral sides of the upper end stripe 24. These lower end stripes 25A and 25B are separated from the upper surface 16 of the metal deck 11 by a predetermined distance upward and extend straight in the front-rear direction. In each reinforcing bar truss 12, the lengths in the front-rear direction of the bottom bars 25A, B arranged in the lateral direction are the same, and the bottom bars 25A, B extend in parallel to each other.

  These lattice muscles 26A and B are iron bars having a circular cross section made by extending iron. The lattice stripes 26A and 26B are located between the pair of convex portions 18 arranged in the lateral direction (positioned away from the convex portions 18 by a predetermined dimension) and located between the metal deck 11 and the upper end stripe 24. However, it extends in the front-rear direction while repeatedly bending (undulating) in a wavy manner in the vertical direction. These lattice stripes 26 </ b> A and 26 </ b> B extend between the upper end convex portion 27 located on the upper end stripe 24 side, the lower end concave portion 29 located on the upper surface 16 side of the metal deck 11, and the upper end convex portion 27 and the lower end concave portion 29. And an intermediate portion 28.

  The pair of lattice bars 26 </ b> A, B forming the reinforcing bar truss 12 are disposed symmetrically in the lateral direction with the upper end bars 24 interposed therebetween. Therefore, the positions of the upper end convex portions 27 of the pair of lattice muscles 26A and 26B aligned in the horizontal direction are matched, the positions of the intermediate portions 28 are matched, and the positions of the lower end concave portions 29 are matched. Each of the lattice stripes 26A and 26B has the same separation dimension between the upper-end convex parts 27 adjacent in the front-rear direction, the upper-end convex parts 27 are arranged at equal intervals in the vertical direction, and the separation dimension between the lower-end concave parts 29 adjacent in the front-rear direction. Equally, the lower end recesses 29 are arranged at equal intervals in the front-rear direction.

  As shown in FIG. 3, the lattice stripes 26 </ b> A and 26 </ b> B are inclined at a predetermined angle with respect to the metal deck 11, and widen outwardly from the upper end convex portion 27 toward the lower end concave portion 29. In addition, there is no limitation in particular about the inclination angle of lattice muscle 26A, B, and if it is located between a pair of convex parts 18 (a position spaced apart from those convex parts 18 inside), the inclination angle will be changed freely. be able to. The upper end convex portions 27 of the lattice stripes 26A and 26B are bent in a convex shape and are bent so as to protrude upward in the vertical direction. The upper end convex portion 27 has a substantially inverted V shape. The upper end convex portion 27 is in contact with the peripheral surface of the upper end stripe 24, and a portion (intersection) of the upper end convex portion 27 that intersects with the upper end stripe 24 is welded (fixed) to the upper end stripe 24 by spot welding.

  An intermediate portion 28 of the lattice bars 26A, B is located inside the lower end bars 25A, B, and a portion (intersection) of the intermediate portion 28 that intersects the lower end bars 25A, B is spot-welded to the lower end bars 25A, B. Is welded (fixed). The lower end concave portions 29 of the lattice stripes 26A and 26B are bent in a concave shape and bent so as to be concave downward in the vertical direction. The lower end concave portion 29 has a substantially V shape, and its bottom portion 30 is located at a predetermined distance from the convex portion 18 inward, and its bottom portion 30 is in contact with the upper surface 16 of the metal deck 11. The bottom portion 30 of the lower end recess 29 has not only a vertex (vertex when the bottom portion 30 is inverted) but also a curvature substantially the same as the curvature of the horizontal stripe 13 described later, It has a slightly larger curvature than the curvature.

  In spot welding between the upper end stripe 24 and the upper end convex portions 27 of the lattice stripes 26A and 26B, although not shown, an automatic welding machine including an electrode and a moving mechanism is used. In an example of welding by an automatic welder, the upper end stripe 24 and the upper end convex portion 27 are sandwiched between the electrodes while pressing the upper end stripe 24 and the upper end convex portion 27 with each electrode. At the same time that the upper end stripe 24 and the upper end convex portion 27 are sandwiched between the electrodes, a predetermined current is supplied to the electrodes (a predetermined voltage is applied). The current flowing from these electrodes flows to the upper end stripe 24 and the upper end projection 27, and heats and melts the upper end stripe 24 and the upper end projection 27. Next, the electrodes are separated from the upper end line 24 and the upper end convex part 27, the upper end line 24 and the upper end convex part 27 are naturally cooled, and the upper end line 24 and the upper end convex part 27 are welded.

  In spot welding of the lower end bars 25A, B and the intermediate part 28 of the lattice bars 26A, B, the lower end bars 25A, B and the intermediate part 28 are pressed by each electrode, and the lower end bars 25A, B and the intermediate part 28 are pressed by these electrodes. Is inserted. At the same time that the lower end bars 25A, B and the intermediate portion 28 are sandwiched by the electrodes, a predetermined current is supplied to the electrodes (a predetermined voltage is applied). The currents flowing from these electrodes flow to the lower end bars 25A, B and the intermediate part 28, and the lower end bars 25A, B and the intermediate part 28 are heated and melted. Next, the electrodes are separated from the lower end bars 25A, B and the intermediate part 28, the lower end bars 25A, B and the intermediate part 28 are naturally cooled, and the lower end bars 25A, B and the intermediate part 28 are welded.

  The angle at which each of the lattice muscles 26A, B is bent in a wave shape in a vertical direction is constant, and the number of times of bending of the lattice muscles 26A, B per unit length (for example, 1 m) is the same. Note that the angle at which the lattices 26A and 26B are bent in the vertical direction can be freely changed, and the angle is adjusted (the number of times the lattices 26A and 26B are bent per unit length is adjusted). Thus, the vertical separation dimension between the upper end convex portions 27 of the lattice stripes 26A and B can be adjusted, and the vertical separation dimension between the lower end concave portions 29 of the lattice stripes 26A and B can be adjusted.

  These horizontal bars 13 are iron bars having a circular cross section made by extending iron, and extend straight in the horizontal direction. The horizontal lengths of the horizontal stripes 13 are the same. The horizontal stripes 13 are disposed on the top surface 16 of the metal deck 11 and on the bottom portion 30 of the lower end recess 29 of the lattice stripes 26A and 26B. In these horizontal stripes 13, the end portion 31 that is the other side edge portion 14 </ b> B of the metal deck 11 and extends in the vicinity of the second hook 23 is bent downward from the convex portion 18 toward the upper surface 16 of the metal deck 11. The horizontal stripes 13 have substantially the same curvature as the curvature of the bottom portion 30 of the lower end recess 29, or have a curvature slightly smaller than the curvature of the bottom portion 30 of the lower end recess 29.

  If the horizontal stripes 13 are arranged on the bottom portion 30 of the lower end concave portion 29 before spot welding the horizontal stripes 13 and the convex portions 18, the horizontal stripes 13 are arranged at the apex of the bottom portion 30 of the lower end concave portion 29 (the bottom portion 30 is turned upside down). And the horizontal stripes 13 are positioned on the bottom portion 30 and, as shown in FIG. 6, the peripheral surface of the horizontal stripes 13 is a protrusion of the top portion 20 of the convex portion 18 formed on the metal deck 11. 21. As shown in FIG. 7, the horizontal stripes 13 are welded (fixed) to the top portion 20 of the convex portion 18 by spot welding. In the slab construction material 10 </ b> A, the lower end recessed portions 29 of the lattice bars 26 </ b> A and 26 </ b> B are sandwiched between the upper surface 16 of the metal deck 11 and the lateral bars 13 and are fixed to the upper surface 16 of the deck 11.

  In the spot welding between the horizontal stripes 13 and the convex portions 18, although not shown, one electrode is disposed above the horizontal stripes 13 and the other side between the both side portions 19 of the convex portions 18 formed on the metal deck 11. Arrange the electrodes. The other electrode is in contact with the top portion 20 of the convex portion 18. One electrode is lowered, the peripheral surface of the horizontal stripe 13 is pressed downward with the electrode, and the horizontal stripe 13 and the apex portion 20 of the convex portion 18 are sandwiched between the electrodes. At the same time that the horizontal stripes 13 and the top portion 20 of the convex portion 18 are sandwiched by these electrodes, a predetermined current is passed through these electrodes (a predetermined voltage is applied).

  The current flowing from these electrodes flows to the horizontal stripes 13 and the convex portions 18, and heats and melts the horizontal stripes 13 and the top portion 20 of the convex portions 18. Next, one electrode rises, one electrode separates from the horizontal stripe 13, the horizontal stripe 13 and the convex portion 18 are naturally cooled, and the horizontal stripe 13 and the top portion 20 of the convex portion 18 are welded. At the time of welding the horizontal stripe 13 and the convex portion 18, the projection 21 formed on the top portion 20 of the convex portion 18 is crushed, and the entire top portion 20 of the convex portion 18 is welded to the circumferential surface of the horizontal stripe 13. The horizontal stripes 13 and the projections 18 are firmly fixed.

  In the slab construction material 10A, since the lower end stripes 25A and B are located inside the convex portion 18, the lower end stripes 25A and B do not obstruct the lowering and raising of the electrodes, and the electrodes and the horizontal stripes 13 and The top portion 20 of the convex portion 18 can be securely fixed by welding. In addition, by making the projection 21 on the top portion 20 of the convex portion 18, the horizontal stripe 13 and the convex portion 18 can be reliably brought into contact with each other, and the top portion 20 of the convex portion 18 can be contacted via the projection 21 of the convex portion 18. The horizontal stripes 13 can be reliably brought into a conductive state, and the horizontal stripes 13 and the top portions 20 of the convex portions 18 can be reliably welded by spot welding.

  There are no particular limitations on the thickness of the upper end stripes 24, lower end stripes 25A and B, lattice stripes 26A and B, and transverse stripes 13, and they are necessary for the size and slab of the slab such as the floor slab, ceiling slab, roof slab, etc. The thickness of the upper muscle 24, the lower muscle 25A, B, the lattice muscle 26A, B, and the lateral muscle 13 can be freely changed in accordance with the strength. The upper muscle 24, the lower muscles 25A and B, the lattice muscles 26A and B, and the transverse muscle 13 are made of iron, but can be made of a metal other than iron. Further, when iron is used for the upper stripes 24, the lower stripes 25A and B, the lattice stripes 26A and B, and the transverse stripes 13, they may be subjected to rust prevention treatment such as plating.

  As an example of constructing a slab using the slab construction material 10A, a plurality of slab construction materials 10A are prepared by installing a reinforcing bar truss 12 and a horizontal reinforcement 13 on the upper surface 16 of the metal deck 11, and then each slab construction material. The first hook 22 and the second hook 23 of 10A are engaged, and the slab building materials 10A are connected in the lateral direction to make an aggregate of the slab building materials 10A. Next, the aggregate | assembly of the connected slab construction material 10A is arrange | positioned and fixed between the cross beams of a building. After the aggregate of the slab building materials 10A is fixed between the cross beams of the building, concrete (not shown) is placed in a formwork (not shown) from above the metal deck 11, and the concrete is cured for a predetermined period. To do. After the concrete curing period elapses, the formwork is removed, and slabs such as floor slabs, ceiling slabs, and roof slabs are completed.

  Existing raw materials such as premix cement, Portland cement, blast furnace cement, fly ash cement, and silica cement can be used as the raw material cement for forming concrete. As water, tap water, river water, lake water, well water, ground water, etc. can be used. As the aggregate, coarse aggregate or fine aggregate can be used.

  In the slab construction material 10A, the height dimension L1 of the convex portion 18 from the upper surface 16 of the metal deck 11 (the height dimension L1 of the side portions 19 from the upper surface 16 of the deck 11) is substantially equal to the diameter L2 of the lattice bars 26A, B. Identical or slightly larger. Therefore, when each horizontal stripe 13 is arranged on the bottom portion 30 of the lower end concave portion 29 of the lattice stripes 26A and 26B, the horizontal stripe 13 always comes into contact with the top portion 20 (projection 21) of the convex portion 18. In the slab construction material 10A, since each horizontal bar 13 abuts on the top part 20 of the convex part 18, the horizontal bar 13 can be reliably welded to the top part 20 of the convex part 18, and the lower ends of these lattice bars 26A, B By sandwiching the concave portion 29 between the upper surface 16 of the metal deck 11 and the horizontal stripes 13, the lattice stripes 26 </ b> A and B can be securely fixed to the upper surface 16 of the metal deck 11.

  The slab construction material 10A is welded to the top portion 20 of the convex portion 18 formed in the metal deck 11 with the transverse stripes 13 arranged on the bottom portion 30 of the lower end concave portion 29 of the lattice stripes 26A and B, and these lattice stripes 26A. , B lower end recesses 29 are sandwiched between the upper surface 16 of the metal deck 11 and the horizontal bars 13, thereby the lattice bars 26 A, B forming the reinforcing bar truss 12 are fixed to the upper surface 16 of the metal deck 11. 12 can be securely fixed to the upper surface 16 of the metal deck 11, and the fixing between the metal deck 11 and the reinforcing truss 12 is not inadvertently released, and the concrete, the metal deck 11, and the reinforcing truss 12 are reinforced concrete. Even if bending tensile force, bending compression force, or shearing force is applied to the concrete that is formed on the slab construction material 10A Never concrete is damaged, it is possible to build a slab having a sufficient strength.

  In the slab construction material 10A, the lower end concave portions 29 of the lattice muscles 26A and 26B are bent into a substantially V shape, and the bottom portion 30 not only has a vertex (vertex when the bottom portion 30 is inverted), but also the bottom portion 30. Has a curvature substantially the same as the curvature of the horizontal stripes 13 or a curvature slightly larger than the curvature of the horizontal stripes 13 (the curvature of the horizontal stripes 13 is slightly smaller than the curvature of the bottom portion 30). When placed on the bottom portion 30 of the lower end recess 29 of the stripes 26A and 26B, the horizontal stripe 13 falls to the apex of the bottom portion 30 of the lower end recess 29, and the horizontal stripe 13 is positioned on the bottom portion 30 of the lower end recess 29, The horizontal stripes 13 do not move and can prevent the horizontal stripes 13 from shifting in the front-rear direction, and the horizontal stripes 13 can be brought into contact with certain portions of the convex portion 18, so that the horizontal stripes 13 with respect to the lattice stripes 26 </ b> A and 26 </ b> B. Not separately required for positioning, lateral stripes 13 can be reliably welded to the top portion 20 of the protrusion 18.

  In the slab construction material 10A, the horizontal stripe 13 is welded to the top portion 20 of the convex portion 18 formed on the metal deck 11, and the lower end recess 29 of the lattice stripes 26A and B is merely in contact with the upper surface of the metal deck. 29 is not welded to the metal deck 11, so that the aesthetic appearance is not impaired, and no welding marks are generated on the lower surface 17 of the metal deck 11, and rust is generated on the lower surface 17 of the metal deck 11. Can be prevented.

  When the end 31 of the horizontal stripe 13 extending in the vicinity of the second hook 23 is not bent from the convex portion 18 toward the upper surface 16 of the metal deck 11 and extends straight, the first hook 22 of the metal deck 11 is When the second hook 23 is engaged, the end 31 of the horizontal bar 13 obstructs the engagement of the hooks 22 and 23, and the hooks 22 and 23 cannot be smoothly engaged. 10A, since the end 31 of the horizontal bar 13 extending in the vicinity of the second hook 23 is bent downward from the convex portion 18 toward the upper surface 16 of the metal deck 11, the end 31 of the horizontal bar 13 is hooked to the hooks 22, 23. The hooks 22 and 23 can be smoothly engaged, and a plurality of slab building materials 10A are connected in the lateral direction to form a slab building material 10A having a predetermined area. It is possible to make a collection.

  FIG. 9 is a top view of a slab building material 10B shown as another example, and FIG. 10 is a front view of the slab building material 10B. FIG. 11 is a partial side view of the slab construction material 10B. 9 to 11, the front-rear direction is indicated by an arrow A, the lateral direction is indicated by an arrow B, and the up-down direction is indicated by an arrow C. This slab construction material 10B is different from that shown in FIG. 1 in that the lower end bars 25A, B are located inside the lattice bars 26A, B, and the void 32 extends in the front-rear direction between the adjacent reinforcing bars truss 12. Since the other configuration is the same as that of the slab construction material 10A in FIG. 1, the same reference numerals as those in FIG. 1 are attached, and the explanation of FIG. Detailed description of other components is omitted.

  The slab building material 10B is disposed on the metal deck 11 having a predetermined area in the front-rear direction, a plurality of reinforcing bars truss 12 arranged on the upper surface 16 of the metal deck 11 and arranged in the lateral direction, and the upper surface 16 of the metal deck 11. And a plurality of horizontal streaks 13 arranged at equal intervals in the front-rear direction and a plurality of voids 32. The slab construction material 10B is used for constructing a slab (not shown) such as a floor slab, a ceiling slab, or a roof slab having a predetermined area.

  The metal deck 11 has both side edges 14A and 14B extending in the front-rear direction and both end edges 15A and 15B extending in the lateral direction, and has a flat upper surface 16 and a lower surface 17. The metal deck 11 has a plurality of convex portions 18 that protrude upward from the upper surface 16 and extend in the front-rear direction. The convex portions 18 have a pair of both side portions 19 extending substantially straight upward from the upper surface 16 of the metal deck 11 and a top portion 20 extending substantially horizontally between the both side portions 19 (see FIGS. 6 and 7). ). The top portion 20 is formed with a protrusion 21 that is located at the center and protrudes upward. A first hook 22 (first engaging portion) similar to that of the metal deck 11 of FIG. 1 is formed on one side edge portion 14A of the metal deck 11, and a second hook 23 is formed on the other side edge portion 14B. (Second engaging portion) is formed.

  The reinforcing bar trusses 12 are disposed between the convex portions 18 of the deck 11 on the upper surface 16 of the metal deck 11 and extend in parallel in the front-rear direction. The reinforcing bar trusses 12 are assembled from one upper bar 24, two (a pair) lower bars 25A, B, and two (a pair) lattice bars 26A, B. The upper end line 24 is located between the pair of convex portions 18 arranged in the lateral direction, and extends in a straight line in the front-rear direction with a predetermined distance away from the upper surface 16 of the metal deck 11.

  The lower end stripes 25A, B are located between the pair of convex portions 18 arranged in the lateral direction (positioned away from the convex portions 18 by a predetermined dimension), and are located inside the lattice stripes 26A, B. , Located below the upper end stripe 24 and on both lateral sides of the upper end stripe 24. The lower end bars 25A and 25B extend in a straight line from the upper surface 16 of the metal deck 11 in the front-rear direction with a predetermined distance therebetween.

  The lattice stripes 26A and 26B are located between the pair of convex portions 18 arranged in the lateral direction (inward from the convex portions 18) and located between the metal deck 11 and the upper end stripe 24, and are wavy in the vertical direction. It extends in the front-rear direction while repeating bending (undulation). These lattice stripes 26 </ b> A and 26 </ b> B extend between the upper end convex portion 27 located on the upper end stripe 24 side, the lower end concave portion 29 located on the upper surface 16 side of the metal deck 11, and the upper end convex portion 27 and the lower end concave portion 29. And an intermediate portion 28.

  The pair of lattice bars 26 </ b> A, B forming the reinforcing bar truss 12 are disposed symmetrically in the lateral direction with the upper end bars 24 interposed therebetween. The lattice stripes 26A and 26B are inclined at a predetermined angle with respect to the metal deck 11 and spread outwardly from the upper end convex portion 27 toward the lower end concave portion 29 in the lateral direction. The upper-end convex portions 27 of the lattice stripes 26A and 26B are bent into a convex shape, and are bent so as to be convex upward in the vertical direction, and have a substantially inverted V shape. The upper end convex portion 27 abuts on the peripheral surface of the upper end stripe 24, and a portion of the upper end convex portion 27 that intersects the upper end stripe 24 is welded (fixed) to the upper end stripe 24 by spot welding.

  The intermediate portion 28 of the lattice bars 26A, B is located outside the lower end bars 25A, B, and the portion of the intermediate portion 28 that intersects with the lower end bars 25A, B is welded (fixed) to the lower end bars 25A, B by spot welding. ) The lower end concave portions 29 of the lattice stripes 26A and 26B are bent into a concave shape, and are bent so as to be concave downward in the vertical direction, so as to have a substantially V shape. The lower end recess 29 has a bottom portion 30 in contact with the lower ends of the side portions 19 of the projections 18 and a bottom portion 30 in contact with the upper surface 16 of the metal deck 11.

  The bottom portion 30 of the lower end recess 29 has not only a vertex (a vertex when the bottom portion 30 is inverted), but also has a curvature substantially the same as the curvature of the horizontal stripes 13 or from the curvature of the horizontal stripes 13. Also has a slightly larger curvature. The spot welding of the upper end reinforcement 24 and the upper end convex portion 27 of the lattice reinforcement 26A, B and the spot welding of the lower end reinforcement 25A, B and the intermediate portion 28 of the lattice reinforcement 26A, B are the same as those of the reinforcing bar truss 11 of FIG. It is.

  When the reinforcing bar truss 12 is disposed between the pair of convex portions 18, the bottom portions 30 of the lower end concave portions 29 of the lattice bars 26 </ b> A and B contact the lower ends of the side portions 19 of the convex portions 18. It is not necessary to arrange the reinforcing bar truss 12 on the upper surface 16 of the metal deck 11 while measuring the lateral distance, and the reinforcing bar truss 12 is laterally spaced at a predetermined interval on the upper surface 16 of the metal deck 11. The slab construction material 10A in which the rebar trusses 12 are arranged in the lateral direction can be easily assembled.

  The horizontal stripes 13 have the same length in the horizontal direction and extend straight in the horizontal direction. The horizontal stripe 13 is disposed on the bottom portion 30 of the lower end recess 29 of the lattice stripes 26A and 26B. In these horizontal stripes 13, the end portion 31 that is the other side edge portion 14 </ b> B of the metal deck 11 and extends in the vicinity of the second hook 23 is bent downward from the convex portion 18 toward the upper surface 16 of the metal deck 11. The horizontal stripes 13 have substantially the same curvature as the curvature of the bottom portion 30 of the lower end recess 29, or have a curvature slightly smaller than the curvature of the bottom portion 30 of the lower end recess 29.

  If the horizontal stripes 13 are arranged on the bottom portion 30 of the lower end concave portion 29 before spot welding the horizontal stripes 13 and the convex portions 18, the horizontal stripes 13 are arranged at the apex of the bottom portion 30 of the lower end concave portion 29 (the bottom portion 30 is turned upside down). The lateral stripe 13 is positioned on the bottom portion 30 of the lower end recess 29, and the circumferential surface of the transverse stripe 13 is placed on the protrusion 21 of the top portion 20 of the convex portion 18 formed on the metal deck 11. (Refer to FIG. 6). The horizontal stripes 13 are welded (fixed) to the top portions 20 of the convex portions 18 by spot welding (referring to FIG. 7). In the slab construction material 10 </ b> A, the lower end recessed portions 29 of the lattice bars 26 </ b> A and 26 </ b> B are sandwiched between the upper surface 16 of the metal deck 11 and the lateral bars 13 and are fixed to the upper surface 16 of the deck 11. Spot welding of the horizontal bars 13 and the convex portions 18 is the same as that of the reinforcing bar truss 12 of FIG.

  In the slab construction material 10B, since the lower end stripes 25A and B are located inside the convex portion 18, the lower end stripes 25A and B do not interfere with the electrodes, and the horizontal stripes 13 and the convex portions 18 are formed by these electrodes. Can be securely fixed by welding. In addition, by making the projection 21 on the top portion 20 of the convex portion 18, the horizontal stripe 13 and the convex portion 18 can be reliably brought into contact with each other, and the convex portion 18 and the horizontal stripe 13 are connected via the projection 21 of the convex portion 18. The conductive state can be ensured, and the horizontal stripe 13 and the top portion 20 of the convex portion 18 can be reliably welded by spot welding.

  These voids 32 are arranged between the adjacent rebar trusses 12 and extend in the front-rear direction. The void 32 is a hollow tubular tube made from a metal plate. These voids 32 are fixed to the slab construction material 10B by a predetermined fixing means (not shown) in a state of being placed on the horizontal bars 13 of the reinforcing bar truss 12. In addition to the tube material, foam (hard urethane foam, phenol foam, bead method polystyrene foam) can also be used as the void 32.

  As an example of constructing a slab using the slab construction material 10B, a plurality of slab construction materials 10B are formed by installing a reinforcing bar truss 12 and a horizontal reinforcement 13 on the upper surface 16 of the metal deck 11, and then each slab construction material. The first hook 22 and the second hook 23 of 10B are engaged, and these slab building materials 10A are connected in the lateral direction to make an aggregate of the slab building materials 10A. Next, voids 32 are arranged between the reinforcing bar trusses 12, and the voids 32 are fixed to the slab building material 10B. Then, the assembly of the slab building materials 10B is arranged and fixed between the cross beams of the building. After fixing the aggregate of the slab building material 10B between the cross beams of the building, concrete (not shown) is placed in a formwork (not shown) from above the metal deck 11, and the concrete is cured for a predetermined period. To do. After the concrete curing period elapses, the formwork is removed, and slabs such as floor slabs, ceiling slabs, and roof slabs are completed.

  In the slab construction material 10B, the height dimension L1 of the convex portion 18 from the upper surface 16 of the metal deck 11 (the height dimension L1 of the both side portions 19 from the upper surface 16 of the deck 11) is substantially equal to the diameter L2 of the lattice bars 26A, B. Same or slightly larger (with assistance of FIG. 5). Therefore, when each horizontal stripe 13 is arranged on the bottom portion 30 of the lower end concave portion 29 of the lattice stripes 26A and 26B, the horizontal stripe 13 always comes into contact with the top portion 20 (projection 21) of the convex portion 18. In the slab construction material 10B, each horizontal bar 13 abuts on the top part 20 of the convex part 18, so that the horizontal bar 13 can be securely welded to the top part 20 of the convex part 18, and the lower ends of these lattice bars 26A, 26B. By sandwiching the concave portion 29 between the upper surface 16 of the metal deck 11 and the horizontal stripes 13, the lattice stripes 26 </ b> A and B can be securely fixed to the upper surface 16 of the metal deck 11.

  The slab construction material 10B is welded to the top portion 20 of the convex portion 18 formed on the metal deck 11 with the transverse stripes 13 arranged on the bottom portion 30 of the lower end concave portion 29 of the lattice stripes 26A and B, and these lattice stripes 26A. , B lower end recesses 29 are sandwiched between the upper surface 16 of the metal deck 11 and the horizontal bars 13, thereby the lattice bars 26 A, B forming the reinforcing bar truss 12 are fixed to the upper surface 16 of the metal deck 11. 12 can be securely fixed to the upper surface 16 of the metal deck 11, and the fixing between the metal deck 11 and the reinforcing truss 12 is not inadvertently released, and the concrete, the metal deck 11, and the reinforcing truss 12 are reinforced concrete. Even if bending tensile force, bending compressive force, and shearing force are applied to the concrete that is formed on the slab construction material 10B Never concrete is damaged, it is possible to build a slab having a sufficient strength.

  In the slab construction material 10B, the lower end concave portions 29 of the lattice muscles 26A, B are bent in a substantially V shape, and the bottom portion 30 not only has a vertex (vertex when the bottom portion 30 is inverted), but also the bottom portion 30. Has a curvature substantially the same as the curvature of the horizontal stripes 13 or a curvature slightly larger than the curvature of the horizontal stripes 13 (the curvature of the horizontal stripes 13 is slightly smaller than the curvature of the bottom portion 30). When placed on the bottom portion 30 of the lower end recess 29 of the stripes 26A and 26B, the horizontal stripe 13 falls to the apex of the bottom portion 30 of the lower end recess 29, and the horizontal stripe 13 is positioned on the bottom portion 30 of the lower end recess 29, The horizontal stripes 13 do not move and can prevent the horizontal stripes 13 from shifting in the front-rear direction, and the horizontal stripes 13 can be brought into contact with certain portions of the convex portion 18, so that the horizontal stripes 13 with respect to the lattice stripes 26 </ b> A and 26 </ b> B. Not separately required for positioning, lateral stripes 13 can be reliably welded to the top portion 20 of the protrusion 18.

  In the slab construction material 10B, the horizontal bars 13 are welded to the top portions 20 of the convex portions 18 formed on the metal deck 11, and the lower end concave portions 29 of the lattice bars 26A and B are merely in contact with the upper surface 16 of the metal deck 11. Since the lower end concave portion 29 is not welded to the metal deck 11, the aesthetic appearance is not impaired, and a weld mark is not generated on the lower surface 16 of the metal deck 11, and rusting on the lower surface 16 of the metal deck 11 is prevented. Occurrence can be prevented.

  In the slab construction material 10B, since the end 31 of the horizontal bar 13 extending in the vicinity of the second hook 23 is bent downward from the convex part 18 toward the upper surface 16 of the metal deck 11, the end 31 of the horizontal bar 13 is hooked to these hooks. The hooks 22 and 23 can be smoothly engaged without interfering with the engagement of the slab construction materials 10B, and a plurality of slab construction materials 10B are connected in the lateral direction to gather the slab construction materials 10B having a predetermined area. You can make a body.

  In the slab construction material 10B, voids 32 are used instead of concrete, and it is not necessary to place concrete in the entire area of the slab construction material 10B, and it is possible to omit the volume of concrete of the voids 32. And the time can be shortened, and the cost of slab construction can be reduced. The slab construction material 10B can reduce the volume of the void 32 compared to the case where only concrete is cast on the slab construction material 10B. Therefore, the slab construction material 10B can reduce the weight of the slab, and can be applied to a steel frame structure or a reinforced concrete structure. Such a load can be reduced.

10A Slab construction material 10B Slab construction material 11 Metal deck 12 Reinforcement truss 13 Horizontal reinforcement 14A, B Both side edge 15A, B Both end edge 16 Upper surface 17 Lower surface 18 Convex portion 19 Both side portion 20 Top portion 21 Protrusion 22 First hook (first hook Engagement part)
23 Second hook (second engaging portion)
24 upper end muscle 25A, B lower end muscle 26A, B lattice muscle 27 upper end convex portion 28 middle portion 29 lower end concave portion 30 bottom portion 31 end portion 32 void L1 height dimension L2 diameter

Claims (7)

In the slab construction material for constructing a slab of a predetermined area,
The slab construction material has a metal deck having a predetermined area having both side edges extending in the front-rear direction and both end edges extending in the lateral direction, and a plurality of rebar trusses installed on the upper surface of the metal deck and extending in the front-rear direction, A plurality of transverse streaks located on the upper surface of the metal deck, extending in the lateral direction and arranged at a predetermined distance in the front-rear direction;
The metal deck has a plurality of convex portions protruding upward from the upper surface thereof, extending in the front-rear direction and spaced apart by a predetermined dimension in the lateral direction, and the reinforcing bar truss is a pair of the convex portions arranged in the lateral direction. And an upper end line that is located above the upper surface of the metal deck and extends in the front-rear direction, and is located between the pair of convex portions and between the metal deck and the upper end line in the front-rear direction. A pair of lower streaks extending between the pair of convex portions and a pair of lattice bars extending in the front-rear direction while repeatedly bending in a wavy shape between the metal deck and the upper end bars,
The lattice stripes spread outwardly in the lateral direction from the upper end convex portion that abuts on the upper end muscle and bends in a convex shape toward the lower end recess that abuts on the upper surface of the metal deck and bends in a concave shape. The upper end convex part of the line was welded to the upper end line, the middle part of the lattice line was welded to the lower end line, and the horizontal line was arranged in the lower end recessed part of the lattice line, and was made on the metal deck. A slab construction material which is welded to a convex part, and a lower end concave part of the lattice bars is sandwiched between the upper surface of the metal deck and the horizontal bars.   The lattice line is made of a metal rod having a circular cross section, and the height dimension of the convex part from the upper surface of the metal deck is substantially the same as or slightly larger than the diameter of the lattice line. The slab construction material according to claim 1, wherein when the horizontal streak is disposed in a lower-end concave portion of the lattice muscle, the horizontal streak abuts on a top portion of the convex portion.   The transverse bars are made of a metal bar having a circular cross section, and in the slab construction material, when the transverse bars are arranged in the lower end recesses of the lattice bars, the transverse bars are located at the bottom portions of the lower end recesses of the lattice bars. The slab construction material according to claim 1 or 2, wherein the lower end recess is bent into a substantially V shape.   The bottom muscles are located outside the lattice muscles and located inside the pair of convex portions, and the bottom recesses of the lattice muscles are located inside the pair of convex portions, and The slab construction material according to any one of claims 1 to 3, wherein the portion is welded by spot welding.   The bottom muscles are located inside the lattice muscles and located inside the pair of convex portions, and the lower end concave portions of the lattice muscles are located inside the pair of convex portions, and The slab construction material according to any one of claims 1 to 3, wherein the portion is welded by spot welding.   One side edge portion of the metal deck is bent downward from the deck to form a first engaging portion, and the other side edge portion of the metal deck is bent upward from the deck. A second engaging portion that engages with the engaging portion is formed, and an end portion of the horizontal stripe that extends in the vicinity of the second engaging portion on the other side edge portion of the metal deck extends from the convex portion to the metal. The slab construction material according to any one of claims 1 to 5, wherein the slab construction material is bent downward toward the upper surface of the deck.   7. The slab construction material according to claim 1, wherein the reinforcing bar trusses are arranged with a predetermined distance in the lateral direction, and voids extending in the front-rear direction are installed between the adjacent reinforcing bar trusses. Slab construction material.

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