JP2005336889A - Deck plate with truss - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a welding stripe inconspicuous by a deck plated with a truss for fixing the truss by vertically welding by sandwiching the deck plate 10. <P>SOLUTION: The trusses 1 and 1 are placed on an upper surface of recessed parts 13 on the deck plate 10 forming recessed parts 13 and 13 having an upward projecting width D (a), and spot welding is performed by a lower electrode 23 and an upper electrode 22 arranged in the recessed parts 13 (b). The deck plate 10 with the truss is formed by fixing the deck plate 10 and the trusses 1 and 1. When the width of the using electrodes 22 and 23 is set to D<SB>O</SB>, the width D of the recessed parts 13 is formed by D<SB>O</SB>< D < 2 × D<SB>O</SB>, and a spot welding trace is restrained in the recessed parts 13. The deck plate 10 forms a rib 18 substantially orthogonal to the recessed parts 13 and 13 by bending a steel plate forming a continuous waveform in the longitudinal direction of the truss 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a deck plate with a truss used as a driving form when a slab is constructed in a reinforced concrete structure or a steel reinforced concrete structure.

  For deck plates with trusses, steel trusses are placed side-by-side on steel plate deck plates, and welding rods (welding means) are approached from the top and bottom of the deck plate, and welding is performed at the contact points between the trusses and the deck plate. Was. In this case, in the structure in which the weld stripes are generated and the bottom surface of the deck plate is used as it is, the weld stripes appear and it is unsightly. Therefore, in order to eliminate the welding stripes, the lower surface of the deck plate is repaired, painted, or a finishing plate is attached.

In order to eliminate such additional work, the applicant proposed a deck plate with a truss where welding fringes are not noticeable on the bottom surface of the deck plate by welding the truss and the deck plate on the top surface of the deck plate. (Patent Document 1).
JP-A-8-15178

  However, in the conventional technique, since the welding work on the upper surface side of the deck plate is indispensable, there is a problem that it cannot be applied to a line that is welded up and down across the deck plate.

  However, the present invention solves the above-mentioned problems because the recessed portion formed larger in diameter than the welding means of the welding machine is formed on the deck plate and the truss and the deck plate are welded.

  That is, according to the present invention, in a deck plate with a truss formed by welding a truss on the deck plate, a concave portion having a width D that protrudes upward is formed on the lower surface of the deck plate, A deck plate with a truss formed by welding and fixing the truss and having a diameter larger than the diameter of the welding means of a welding machine using the width D.

In the above, when the diameter of the welding means of the welding machine to be used is D ₀ , the width D of the recessed portion is
D ₀ <D <2 × D ₀
It is a deck plate with a truss characterized by that. Moreover, it is the deck plate with a truss which formed the protrusion which becomes convex upwards on the top surface of a recessed part, and welded and fixed this protrusion and the truss. Further, the deck plate is a deck plate with a truss having a wave shape continuous in the longitudinal direction of the truss and formed with ribs substantially orthogonal to the recessed portions.

  The welding means in the above is a means for passing an electric current between objects to be welded, for example, an electrode to be welded.

  Since the recessed portion having a width L that is larger than the diameter of the welding means of the welding machine is formed on the deck plate and the bottom portion of the recessed portion and the truss are welded and fixed, the welding stripe is formed only in the recessed portion. . Therefore, since welding stripes are not widely formed on the bottom surface of the deck plate, even when the ceiling is formed by exposing the deck plate, the welding stripes are not conspicuous, so that the finishing work can be omitted.

  Moreover, in order not to expose the welding stripes in the recessed portion, it can be completed by painting the recessed portion or attaching a finishing material, so that the finishing effort can be greatly reduced.

  Further, since the recessed portion is formed to have a size and depth enough to insert the welding means, both the length direction and the width direction of the deck plate are reinforced.

  In the present invention, concave portions 13 and 13 having a convex width D are formed on the lower surface of the deck plate 10, and the trusses 1 and 1 placed on the upper surface of the concave portion 13 are disposed in the concave portion 13. Further, spot welding is performed with the lower electrode 23 (FIG. 3) and the upper electrode 22, and the deck plate 10 and the trusses 1 and 1 are fixed to form the deck plate 10 with trusses (FIGS. 1 and 2). .

When the width of the electrodes 22 and 23 to be used is D ₀ , the width D of the recessed portion 13 is
D ₀ <D <2 × D ₀
The ridge 17 is formed at the upper end of the recessed portion 13, and the truss 1 is fixed via the ridge 17.

  Further, the deck plate 10 is formed with a rib 18 that is substantially orthogonal to the recessed portions 13, 13 by bending a corrugated steel plate that is continuous in the length direction of the truss 1 (FIGS. 2, 3).

  An embodiment of the present invention will be described based on the drawings.

[1] Configuration of truss 1

In the truss 1, one upper main reinforcing bar (diameter t ₂₁ ) 2, two lower main reinforcing bars (diameter t ₂₁ ) 3, 3 are arranged at the vertices of an isosceles triangle, and the upper and lower main reinforcing bars 2, 3 In addition, the corrugated lattice rebar (diameter t ₂₂ ) 4 is fixed to form a three-dimensional shape. At this time, the upper end portion of the lattice reinforcing bar 4 is in contact with the outer side of the upper main reinforcing bar 2, and the lower part of the lattice reinforcing bar 4 is in contact with the inner side of the lower main reinforcing bar 3. Further, the lower end portion of the lattice reinforcing bar 4 is bent horizontally toward the outside to form fixing portions 5 and 5. The upper and lower main bars usually use deformed bars.

In the above, each numerical value is set as follows, for example.
・ The diameter t ₂₁ of the lattice rebar 4 is 5 to 8 mm, usually t ₂₁ = 6 mm.
-Diameter of upper and lower main reinforcing bars 2 and 3 t ₂₂ = 10 to 16 mm, usually t ₂₂ = 13 mm
・ Distance D ₂₁ = 70 to 90 mm between lower main reinforcing bars 3 and 3, usually D ₂₁ = 80 mm
-The height H _{21 of the} truss 1 = 80 to 300 mm,
Usually H ₂₁ = 110mm or 200mm

[2] Configuration of deck plate 10

The deck plate 10 is composed of a steel plate having a length L ₁₁ and a width D ₁₁ and a thickness t ₁₁ (FIGS. 1 and 2). Towards the lower surface 11 of the deck plate 10 to the upper surface 12, the width _{D 1} of the bottom plate 14, at the height width _{D 2} of the opening 16 (depth) to form a trapezoidal cross section of the recess 13, 13 of the _{H 1.}

The recessed portion 13 is formed over the entire length of the deck plate 10 in accordance with the position where the fixing portions 5 and 5 of the truss 1 are installed. At the center of the bottom plate (top plate) 14 of each recessed portion 13, an upwardly protruding ridge 17 having a width D ₃ and a height H ₃ is formed over the entire length of the deck plate 10 (FIG. 3).

  At both ends of the deck plate 10, connecting portions 19 and 19 a that are fitted to each other to join the adjacent deck plates 10 and 10 are formed.

Further, the deck plate described above is formed by bending a steel plate on which concave and convex portions that are continuously rippled in the length direction are bent to form the recessed portion 13, the connecting portions 19 and 19a, and the like. Ribs 18 and 18 are formed between the recessed portions 13 and 13 from the unevenness that continues in a rippled shape (FIGS. 2 and 3). The ribs 18 and 18 reinforce both the direction of the width D _{11 and the} direction of the length L ₁₁ of the deck plate 10.

In the above, each numerical value is set as follows, for example.
・ Deck plate 10 thickness t ₁₁ = 0.4 to 0.5 mm
・ Width D ₁₁ of the deck plate 10 = 400 mm
・ Deck plate 10 length L ₁₁ = 6000 mm
-Width D ₁ = 9 mm of the bottom plate 14 of the recessed portion 13
-Width D ₂ of opening 16 of recess 13 = 12 mm
-Height (depth) of the recessed portion 13 H ₁ = 2 mm
・ Distance D ₄ between the recessed portions 13 and 13 for the fixing portion of one truss 1 D ₄ = 100 mm
-Distance D ₅ = 230 mm between the recessed portions 13 and 13 for fixing portions of adjacent trusses
· Width _D of the ridge 17 3 = 2mm
The height of the ridge-17 _H 2 = 1mm

[3] Configuration of deck plate 20 with truss

(1) on the upper surface 11 of deck plate 10, the two trusses, with the center of the distance _{D 22,} placed side by side. In this state, the fixing portions 5 and 5 of the truss 1 and 1 are placed on the protrusions 17 of the deck plate 10.

In the above, the numerical values are set as follows, for example.
・ Distance between trusses 1 and 1 D ₂₂ = 200 mm

(2) Subsequently, the upper electrode 22 and the lower electrode 23 are arranged so as to sandwich the fixing portion 5 and the recessed portion 13 of the truss 1 up and down, and electricity is passed between the electrodes 22 and 23. At this time, since the lower electrode 23 is formed to be narrower than the bottom plate 14 of the recessed portion 13 of the deck plate 10 (D ₀ <D ₁ ), the welding stripe remains in the recessed portion 13 and the welding stripe is recessed. It is possible to prevent the bottom surface 12 of the deck plate 10 from being generated beyond the 13 openings 16. Incidentally, the upper and lower electrodes in the normal width _D 0 = about 8 mm, length direction 60 mm, and has a flat bar-like shape of height 30 mm.

(3) The truss-equipped deck plate 20 of the present invention is configured as described above (FIGS. 1 and 2).

(4) The deck plate 20 with truss is used as a slab form in a concrete structure (reinforced concrete, steel reinforced concrete), which is installed between beam forms as in the case of conventional deck plates with truss. In this deck plate, since welding stripes are not conspicuous, the lower surface 12 of the deck plate 10 can be exposed without stretching the ceiling.

  If necessary, the welding stripes can be completely covered by painting the inside of the recessed portion 13 or stretching various sheets in the recessed portion 13.

[4] Other embodiments

(1) In the above description, two trusses 1 are arranged in parallel, but may be one or three or more (not shown). In this case, the size of the deck plate 10 is set so that the space between the trusses 1 is appropriate.

  Moreover, if it has the fixing | fixed part 5 and 5 for welding with the deck plate 10, the structure of the truss 1 is arbitrary. For example, the lower main reinforcing bar 3 can also be arranged inside the lattice reinforcing bar 4 (not shown). Further, for example, not a three-dimensional structure, but a planar structure with the lower main reinforcing bar 3 and the lattice reinforcing bar 4 as one (not shown) is also possible.

(2) Moreover, in the said Example, although the recessed part 13 was formed over the full length of the length direction of the deck plate 10, it should just exist in the position (welding position) of the fixing | fixed part 5 of the truss 1 at least. Therefore, it can also be formed intermittently (not shown). Moreover, although the protrusion 17 formed in the recessed part 13 was also formed in the full length of the length direction, according to the position of the fixing | fixed part 5 of the truss 1, it can also form intermittently. Further, the protrusion 17 can be omitted (not shown).

  Moreover, although the shape of the recessed part 13 was formed in the cross-sectional trapezoid shape, a rectangle, a semicircle diameter, circular arc shape, etc. are arbitrary (not shown).

The width of the recessed portion 13 is preferably formed such that the width D ₁ of the bottom plate 14 is larger than the width D ₀ of the lower electrode 23, but if it is formed at least larger than the width D ₀ of the opening of the recessed portion 13. Good (not shown).

The width _{D 1} (or _{D 2)} of the recessed portion 13, since the size of the welding stripe spread is usually about twice the width _{D 0} of the lower electrode 23, twice the width _{D 0} of the lower electrode 23 It is enough to make it smaller. That is, it is desirable to set the width D ₁ (or D ₂ ) of the recessed portion 13 as follows.

D ₀ <“D ₁ (or D ₂ )” <2 × D ₀
In addition, when the width D ₁ (or D ₂ ) is set to 20 mm or more, the formed welding stripes become conspicuous. Therefore, it is desirable to set the width D ₁ (or D ₂ ) to 20 mm or less. From this point of view, it is desirable that D ₁ (or D ₂ ) <2 × D ₀ .

(3) Further, in the above-described embodiment, the ribs 18 and 18 are configured by using a steel plate on which ripples are formed in advance, so that the deck plate 10 is formed. Although it is desirable because the plate is reinforced, it can be formed in an intermittent shape between the recessed portions 13 and 13 as in the prior art (FIG. 1). If the deck plate is reinforced as a result, the configuration of the ribs 18 is arbitrary.

.

It is a front view of the deck plate with a truss of the Example of this invention. It is also a plan view. (A) is the enlarged view of A part of FIG. 1, (b) is the enlarged view of B part of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Truss 2 Upper main reinforcement 3 Lower main reinforcement 4 Lattice reinforcement 5 Fixing part 10 Deck plate 11 Deck plate upper surface 12 Deck plate lower surface 13 Recessed part 14 Recessed part bottom plate 15 Recessed part bottom plate bottom face 16 Recessed part opening 17 ridges 18 in the recessed portion ribs 19 and 19a of the deck plate connecting portion 20 of the deck plate deck plate 22 with truss electrode (upper)
23 electrodes (bottom)

Claims (4)

In deck plate with truss that welds truss on deck plate,
A concave portion having a width D that protrudes upward is formed on the lower surface of the deck plate, and the upper surface side of the concave portion and the truss are fixed by welding. The diameter of the welding means of the welding machine that uses the width D Deck plate with truss, characterized by having a larger diameter. When the diameter of the welding means welding machine used to D _0, the width D of the recess,
D ₀ <D <2 × D ₀
The deck plate with a truss according to claim 1. The deck plate with a truss according to claim 1, wherein a protrusion protruding upward is formed on a top surface of the recess, and the protrusion and the truss are fixed by welding. The deck plate with trusses according to claim 1, wherein the deck plate has a wave shape continuous in the length direction of the truss, and a rib substantially orthogonal to the recessed portion is formed.

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