JP5054807B2 - Deck plate with truss - Google Patents

Description

  The present invention relates to a deck plate with a truss in which a plurality of truss structures are arranged in parallel on a metal substrate, and in particular, the present invention corresponds to the upper bar, the lower bar, and the lattice bar of a reinforcing bar truss as the truss structure. The present invention relates to a deck plate with a truss using a plate-like truss structure having a structure.

  Conventionally, as a deck plate with a truss used to construct a floor slab, for example, as shown in FIG. 11, a plurality of suspension members 90 are arranged at predetermined intervals on a metal substrate 9. There is one in which the upper end of the reinforcing bar truss 91 is fixed to the top and the reinforcing bar truss 91 is suspended (for example, see Patent Document 1).

JP 2005-133447 A

  Each reinforcing bar truss 91 has an upper end bar 92 and a lower end bar 93 that are parallel to each other. The upper end bar 92 is fixed to the top of the corrugated lattice bar 94 and the lower end bar 93 is fixed to the bottom unit by welding. Yes. The upper bar 92 and the lower bar 93 are straight steel bars, and the lattice bar 94 is formed by bending an iron wire. The reinforcing bar truss 91 supports a load including the weight of concrete and transmits it to end members (not shown) arranged at both end positions. Each end member has an upper end fixed to the upper end bar 92 of the reinforcing bar truss 91 and a lower end fixed to the substrate 9 by welding.

  Each suspension member 90 is formed by alternately bending a crest 90a and a horizontal trough 90b, which are bent in an iron wire shape to form an inverted V shape. Each trough 90b is fixed to the surface of the substrate 9 by welding, and the upper end bar 92 of the reinforcing bar truss 91 is fixed to the top of the peak 90a of each suspension member 90 by welding. The height of the peak portion 90 a of the suspension member 90 is set in consideration of the cover thickness necessary for the reinforced concrete between the lower end reinforcement 93 of the reinforcing bar truss 91 and the substrate 9.

  In the deck plate with a reinforcing bar truss having the above-described configuration, each reinforcing bar truss 91 is welded with the top part of the lattice 94 being connected to the upper reinforcing bar 92 and the bottom part thereof to the lower reinforcing bar 93. 91, the lower end is welded to the base plate 9, and each suspension member 90 has a valley portion 90b on the surface of the base plate 9 and a top portion of each peak portion 90a on the upper end bar 92 of the reinforcing bar truss 91. Since each is welded, each welded part is affected by heat at the time of welding, causing the quality of the material to deteriorate, which causes a decrease in strength. In addition, since the joint strength at each welded portion varies, it is necessary to perform a weld strength test on the welded portion between the upper and lower reinforcements 92 and 93 and the lattice reinforcement 94. Furthermore, since the welding work is performed manually, there is a problem that the burden on the worker is large, the labor cost is increased, and the production efficiency is poor.

  Furthermore, when constructing a floor slab having a level difference, the lower end bar 93 of the reinforcing bar truss 91 is bent or the upper end bar 92 or the lattice bar 94 is divided at a position corresponding to the level difference of the floor slab to be constructed. There is a problem that this type of work is not only troublesome, but also reduces the strength of the rebar truss.

  The present invention has been made paying attention to the above-described problems, and uses a plate-like truss structure having a configuration corresponding to the upper bar, the lower bar and the lattice bar of the reinforcing bar truss, and the truss structure and the end. By adopting a joint structure that does not rely on welding between the member and the suspension material, there is no loss in material strength or variation in joint strength due to heat during welding, so that labor costs rise due to manual welding work and manufacturing efficiency An object of the present invention is to provide a deck plate with a truss that prevents the lowering of the above.

  In the deck plate with truss according to the present invention, a plurality of rows of truss structures are arranged side by side by end members at both end positions and suspension members at intermediate positions on a metal substrate. The truss structure is a plate-like body, and an upper side corresponding to the upper end of the reinforcing bar truss is formed by alternately punching each of the triangular and inverted triangular window holes along the length direction in a metal strip. The lower side corresponding to the lower end line and the inclined side corresponding to the lattice line are respectively formed. An upper opening groove into which the lower side portion of the truss structure body is inserted from above is formed at a height position corresponding to the concrete cover thickness of the end member. A groove having a lower opening into which the lower side portion of the truss structure is fitted from below is formed at a height position corresponding to the concrete cover thickness of the suspension material.

  In the deck plate with truss configured as described above, the truss structure works as a suspending force frame during temporary installation, and the upper side and lower side serve as slab main bars of reinforced concrete and resists the tensile force generated by the moment when installed. The side part serves as a spacer for maintaining the distance between the upper side part and the lower side part. The truss structure supports the load including the weight of concrete and transmits it to the end members at both ends. The suspension material functions to apply a load on the substrate serving as a dam plate to the truss structure during temporary installation, and has a function of holding the truss structure at an appropriate position when placing concrete. In addition, there is also a function to disperse cracks in the concrete in the direction of the main reinforcement during the main installation.

The truss structure is a plate-like body that is integrally provided with an upper side corresponding to the upper end of the reinforcing bar truss, a lower side corresponding to the lower end, and an inclined side corresponding to the lattice, and Since the end member and the suspension member have a connection structure not based on welding, there is no welded portion, and the material is not deteriorated or deteriorated in strength due to the influence of heat during welding.
The truss structure can be cut out and the window holes can be cut out from the strip with a water jet or laser cutter. The production efficiency of the body is improved.

In the above-described configuration of the present invention, the suspension member and the end member may have various forms. However, the suspension member and the end member of the preferred embodiment are plate-like bodies, and are formed into an arch shape by a metal plate member. Has been.
According to this embodiment, the suspension member and the end member can be manufactured using the same metal plate as that of the truss structure. Moreover, since it is an arch shape with the lower part opened, it is lightweight, and the concrete flows into the open part below the arch at the time of placing the concrete, preventing the concrete from being torn.

  In a preferred embodiment of the present invention, the metal plate is a triangular or inverted triangular plate that is hollowed out from the band plate. According to this embodiment, the material is effectively used, and the cost can be reduced.

In one embodiment of the present invention, a convex piece protruding into each window hole is integrally formed on the upper side portion and the lower side portion, and each convex piece on the upper side portion has a hole for holding an upper distribution line, Each convex piece on the lower side part is formed with a hole for holding the lower distribution bar.
In this embodiment, positioning and fixing are possible by passing the upper and lower force distribution bars through the holes, and the welded portion can be eliminated.

  The said board | substrate is match | combined with the form of the floor slab which should be constructed | assembled, and is a thing of a form without a level | step difference with respect to the floor slab without a level | step difference. On the other hand, for a floor slab having a level difference, a step having a level difference is formed, and a level difference portion composed of first and second bent portions is formed at a position corresponding to the level difference of the floor slab. . In the former case, the upper side portion and the lower side portion of the truss structure body are each linear, but in the latter case, the upper side portion and the lower side portion of the truss structure body are non-linear at the step portion of the substrate. Each truss structure is manufactured by cutting out a metal plate and punching out a window hole.

  According to the present invention, the plate-like truss structure having a configuration corresponding to the upper bar, the lower bar, and the lattice bar of the reinforcing bar truss is used, and the truss structure, the end member, and the suspension member are welded. Since there is no connection structure, there are no welded parts, and it is possible to eliminate material strength reduction and variation in bonding strength due to heat during welding. In addition, the need for manual welding work is eliminated, and the manufacture of the truss structure can be automated, thus reducing labor costs and improving manufacturing efficiency. Furthermore, not only floor slabs without steps, but also construction of slabs with steps, the truss structure is manufactured by cutting out metal plate materials and punching out the window holes. There is no need to bend or cut the rebar at the position to be done, the work is simplified and the strength of the truss is not lowered.

It is a front view which shows the structure of the deck plate with a truss which is one Example of this invention. It is a top view of the Example of FIG. It is a side view of the Example of FIG. It is sectional drawing which follows the AA line of the Example of FIG. It is an enlarged front view showing one example of a truss structure, an end member, and a suspension material. It is a perspective view which shows one Example of an end member. It is a perspective view which shows one Example of a hanging material. It is a front view which shows the connection structure of the truss structure on a beam. It is a front view of the Example applied to the floor slab with a level | step difference. It is a front view of the other Example applied to the floor slab with a level | step difference. It is a side view which shows the structure of the conventional deck plate with a reinforcing bar truss.

  1 to 4 show the structure of a deck plate 1 with a truss according to an embodiment of the present invention. The trussed deck plate 1 in the illustrated example is used for construction of a floor slab having no step, but the present invention is not limited to this, and there is a step as in the embodiments shown in FIGS. It is applicable also to the deck plate 10 with a truss for constructing a floor slab.

  The illustrated truss-equipped deck plate 1 includes a plate-like truss structure 3 on a metal substrate 2 having a predetermined area, two end members 4 and 4 at both end positions, and a plurality of suspension members at intermediate positions. 5 are arranged in a plurality of rows in the vertical direction at predetermined intervals. The substrate 2 is made of a galvanized steel plate and supports a load in cooperation with the truss structure 3 and the suspension member 5 at the time of temporary installation and holds the fluid concrete so that it does not spill. Both ends of the board 2 are placed on the beams 11 and 11 and spanned, and the total load consisting of the weight of the concrete placed on the board 2 and the weight of the deck plate 1 with truss itself is the end member. 4 and 4 are transmitted to the beams 11 and 11, respectively. In addition, although the board | substrate 2 of this Example is a thing of a form without a level | step difference according to the floor slab without a level | step difference which should be constructed | assembled, in the deck plate 10 with a truss mentioned later for constructing a level | level floor slab with a level | step difference, A step portion is formed at a position corresponding to the step of the floor slab.

The truss structure 3 is a belt-like plate-like body having a predetermined height h corresponding to the slab thickness D. The truss structure 3 is triangularly formed on a steel strip 6 cut from a steel plate having a thickness of 9 mm to 12 mm by a water jet or a laser cutter. The first window hole 61 having a shape and the second window hole 62 having an inverted triangle shape are formed by cutting out alternately at equal intervals along the length direction. In FIG. 1, d1 is a lower cover thickness and d2 is an upper cover thickness, which are set to 20 mm or more, respectively. Each of the window holes 61 and 62 is a flat isosceles triangle whose height is sufficiently low with respect to the length of the base of the triangle. The triangle top 63 of the first window hole 61 and the triangle base 67 of the second window hole 62 are aligned in height. Similarly, the triangular top portion 66 of the second window hole 62 and the triangular bottom side portion 64 of the first window hole 61 have the same height. When concrete is placed on the substrate 2, the concrete flows into the window holes 61 and 62, so that the concrete is prevented from being torn.

  The upper side portion 31 formed between the upper edge 60a of the strip 6 and the triangular bottom side portion 67 of the second window hole 62, the diagonal side portion 65 of the first window hole 61 and the adjacent second side portion 67. It is formed between the inclined side portions 33 and 34 formed between the triangular oblique side portion 68 of the window hole 62 and the lower edge 60 b of the strip 6 and the triangular base side portion 64 of the first window hole 61. The lower side 32 is continuously and integrally connected. The upper side portion 31 and the lower side portion 32 of the truss structure 3 are each linear, the upper side portion 31 corresponds to the upper end bar 92 of the reinforcing bar truss 91 shown in FIG. 11, and the lower side unit 32 is the lower end of the reinforcing bar truss 91. Corresponding to the muscle 93, the inclined sides 33 and 34 correspond to the lattice 94 of the reinforcing bar truss 91. The upper side portion 31, the lower side portion 32, and the inclined side portions 33 and 34 perform the same functions as the upper end bar 92, the lower end bar 93, and the lattice bar 94 of the reinforcing bar truss 91, and all have a width of 10 mm or more. Has been.

  On the upper side portion 31 of the truss structure 3, a convex piece 35 protruding into the second window hole 62 is integrally formed at the center position of the triangular bottom side portion 67 of the second window hole 62. Each convex piece 35 is formed with a holding hole 37 for holding through the upper force distribution bars 7 provided orthogonal to the truss structure 3. Further, the lower side portion 32 is integrally formed with a convex piece 36 protruding into the second window hole 61 at the center position of the triangular base side portion 64 of the first window hole 61. Each convex piece 36 is formed with a holding hole 38 for holding it through a lower force distribution bar 70 provided orthogonal to the truss structure 3. In addition, although each holding hole 37 and 38 is a circular through-hole, not only this but a part of hole may be notched. Moreover, each convex piece 35 and 36 can also protrude outward.

  The truss structure 3 described above includes a substrate by two end members 4 disposed at both end positions and a plurality of suspension members 5 disposed corresponding to the positions of all the second window holes 62. 2 is supported at a predetermined height position above 2 while maintaining a vertical posture. The end member 4 and the suspension member 5 in the illustrated example are both plate-like bodies, and are cut into a predetermined shape from a steel plate having an appropriate thickness by a water jet or a laser cutter. In this embodiment, as shown in FIG. 5, a triangular plate material 69 cut out from the strip plate material 6 for manufacturing the truss structure 3 is used, and the arch-shaped end member 4 and the suspension material are drawn from the plate material 69. 5 is cut out.

  As shown in FIG. 6, each end member 4 is formed by integrally forming leg portions 42 and 42 below a horizontal main body portion 40 with a rectangular open portion 41 interposed therebetween. A rectangular groove 43 having an upper opening into which the lower side portion 32 of the truss structure 3 is fitted from above is formed on the upper surface of the main body portion 40. The groove 43 is formed to have a groove width and a groove depth substantially matching the thickness and width of the lower side portion 32 so that the lower side portion 32 of the truss structure 3 is closely fitted. Further, the height of the end member 4 is set so that the groove bottom of the groove 43 is at a height position corresponding to the concrete cover thickness d1. The lower ends of the legs 42 and 42 extend outward, and the legs 42 of the end member 4 are stably supported on the substrate 2 by the extended portions 44. The end member 4 is fixed on the substrate 2 with screws (not shown), and the screws are screwed into the leg portions 42 from the back surface of the substrate 2.

  As shown in FIG. 7, each suspension member 5 is formed by integrally forming leg portions 52, 52 below a horizontal main body portion 50 with a rectangular open portion 51 interposed therebetween. A rectangular groove 53 having a lower opening in which the lower side portion 32 of the truss structure 3 is fitted from below is formed on the lower surface of the main body portion 50. The groove 53 is formed to have a groove width and a groove depth substantially matching the thickness and width of the lower side portion 32 so that the lower side portion 32 of the truss structure 3 is closely fitted. Further, the height of the suspension member 5 is set so that the opening end of the groove 53 is at a height position corresponding to the concrete under cover thickness d1. The lower ends of the leg portions 52 and 52 extend outward, and the leg portions 52 of the suspension member 5 are stably supported on the substrate 2 by the extended portions 54. The suspension member 5 is fixed on the substrate 2 by screws (not shown), and the screws are screwed into the leg portions 52 from the back surface of the substrate 2.

  FIG. 8 shows a connection structure when the left and right truss structures 3, 3 spanned from both sides of the beam 11 are connected on the beam 11. In the figure, 8 is a connecting member made of a steel plate, and aligns the upper and lower holes 81, 81 formed at both ends with the upper and lower holes 39, 39 formed at the end of the truss structure 3. The connection is made through a connecting rod (not shown). In the figure, 83 is a stud integrated with the connecting member 8, and is fixed on the upper surface of the beam 11.

9 and 10 show an embodiment of a deck plate 10 with a truss used to build a stepped floor slab.
The embodiment shown in FIG. 9 is in a form adapted to a floor slab having a small step, and the substrate 2 has an inclined portion, and the first and second bent portions are provided at the upper and lower ends of the inclined portion. Portions 21 and 22 are formed. The truss structure 3 is composed of a strip-shaped first portion 3A positioned on the step, a strip-shaped second portion 3B positioned below the step, and a deformed third portion 3C positioned on the stepped portion. ing. The first and second portions 3A and 3B have the same configuration as that of the above-described embodiment. The third portion 3C is provided with a plurality of right-angled triangular window holes 61C, and a bent upper side portion 31C continuous with the upper side portion 31 of the first and second portions 3A, 3B, and the first, Each of the second portions 3A and 3B has a lower side portion 32 and a lower side portion 32C that is continuous. The upper side portions 31 and 31C and the lower side portions 32 and 32C are non-linear at the step portions.

  The embodiment shown in FIG. 10 is in a form adapted to a floor slab having a large step, and the substrate 2 has step portions, and the first and second bent portions are provided at the upper and lower ends of the step portion. Portions 21 and 22 are formed. The truss structure 3 is composed of a strip-shaped first portion 3A positioned on the step, a strip-shaped second portion 3B positioned below the step, and a deformed third portion 3C positioned on the stepped portion. ing. The first and second portions 3A and 3B have the same configuration as that of the above-described embodiment. The third portion 3C has a plurality of right-angled triangular window holes 61C, a bent upper side portion 31C continuous with the upper side portion 31 of the first and second portions 3A, 3B, and the first, It has a lower side 32 of the second part 3A, 3B and a lower side 32C of a bent shape that is continuous. The upper side portions 31 and 31C and the lower side portions 32 and 32C are non-linear at the step portions.

  In the deck plates 1 and 10 with trusses having the above-described structure, the truss structure 3 works as a suspension frame during temporary installation, and the upper side portion 31 and the lower side portion 32 resist resistance to tensile force generated by moments as slab main bars of reinforced concrete during permanent installation. The inclined side portions 33 and 34 serve as spacers that maintain the distance between the upper side portion 31 and the lower side portion 32. The truss structure 3 supports a load including the weight of concrete and transmits it to the end members 4 and 4 at both end positions. Each suspension member 5 functions to apply a load on the substrate 2 serving as a dam plate to the truss structure 3 during temporary installation, and has a function of holding the truss structure 3 at an appropriate position during concrete placement. In addition, there is also a function to disperse cracks in the concrete in the direction of the main reinforcement during the main installation.

The truss structure 3 includes an upper side 31 corresponding to an upper end bar 92 of a conventional reinforcing bar truss 91, a lower side 32 corresponding to a lower end bar 93, and inclined side parts 33 and 34 corresponding to a lattice bar 94 in series and integrally. Since it is a provided plate-like body, there is no welded portion, and the upper side portion 31, the lower side portion 32, and the inclined side portions 33 and 34 have the same functions as the upper end bar 92, the lower end bar 93, and the lattice bar 94 of the reinforcing bar truss 91. Demonstrate. Since the truss structure 3 and the end member 4 and the suspension member 5 are connected by fitting, there is no welded portion in the same manner, and the material is affected by the influence of heat during welding and the strength is deteriorated. There is no.
The truss structure 3, the end member 4, and the suspension member 5 are cut out of the plate material and the window hole is punched out of the plate material by a water jet or a laser cutter. Production of the hanger 5 can be automated, and labor saving is realized.

DESCRIPTION OF SYMBOLS 1,10 Deck plate with truss 2 Substrate 3 Truss structure 4 End member 5 Lifting material 7 Upper power distribution bar 31 Upper side 32 Lower side 33, 34 Inclined side 35, 36 Convex piece 37, 38 Hole 43, 53 Groove 70 Lower strength bar

Claims (6)

  In a deck plate with trusses in which truss structures are arranged in a plurality of rows by end members at both ends and suspension members at intermediate positions on a metal substrate, the truss structure is a plate-like body, and a metal strip The upper and lower sides corresponding to the upper end of the reinforcing bar truss, the lower side corresponding to the lower end, and the slope corresponding to the lattice bar Each of the side portions is formed, and at the height position corresponding to the concrete cover thickness of the end member, an upper opening groove into which the lower side portion of the truss structure is inserted from above is formed, and the suspension member A deck plate with a truss, in which a groove of a lower opening into which the lower side portion of the truss structure is inserted from below is formed at a height position corresponding to the cover thickness of the concrete.   The deck plate with a truss according to claim 1, wherein the suspension member and the end member are plate-like bodies and are formed in an arch shape by a metal plate member.   The deck plate with a truss according to claim 2, wherein the metal plate is a triangular or inverted triangular plate that is hollowed out from the band plate.   The upper side and the lower side are integrally formed with projecting pieces protruding into the respective window holes, the upper side has convex holes for holding the upper strength bars, and the lower side has convex parts. The deck plate with a truss according to claim 1, wherein holes for holding the distribution bars are formed.   The deck with truss according to claim 1, wherein the board has a shape without a step corresponding to a floor slab without a step to be constructed, and an upper side portion and a lower side portion of the truss structure are each linear. plate.   The substrate has a step with a step corresponding to the stepped floor slab to be constructed, and a step portion formed of first and second bent portions is formed at a position corresponding to the step of the floor slab. The deck plate with a truss according to claim 1, wherein an upper side portion and a lower side portion of the truss structure body are non-linear at a step portion of the substrate.

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